import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
import { z } from "zod";
import { BasicAgent, defineTool, type ToolDefinition } from "../index";
import {
  EventType,
  type BaseEvent,
  type ReasoningStartEvent,
  type RunAgentInput,
} from "@ag-ui/client";
import { streamText } from "ai";
import {
  mockStreamTextResponse,
  textStart,
  textDelta,
  finish,
  abort,
  error,
  collectEvents,
  toolCallStreamingStart,
  toolCallDelta,
  toolCall,
  toolResult,
  reasoningStart,
  reasoningDelta,
  reasoningEnd,
} from "./test-helpers";

// Mock the ai module
vi.mock("ai", () => ({
  streamText: vi.fn(),
  tool: vi.fn((config) => config),
}));

// Mock the SDK clients
vi.mock("@ai-sdk/openai", () => ({
  createOpenAI: vi.fn(() => (modelId: string) => ({
    modelId,
    provider: "openai",
  })),
}));

vi.mock("@ai-sdk/anthropic", () => ({
  createAnthropic: vi.fn(() => (modelId: string) => ({
    modelId,
    provider: "anthropic",
  })),
}));

vi.mock("@ai-sdk/google", () => ({
  createGoogleGenerativeAI: vi.fn(() => (modelId: string) => ({
    modelId,
    provider: "google",
  })),
}));

describe("BasicAgent", () => {
  const originalEnv = process.env;

  beforeEach(() => {
    vi.clearAllMocks();
    process.env = { ...originalEnv };
    process.env.OPENAI_API_KEY = "test-key";
    process.env.ANTHROPIC_API_KEY = "test-key";
    process.env.GOOGLE_API_KEY = "test-key";
  });

  afterEach(() => {
    process.env = originalEnv;
  });

  describe("Basic Event Emission", () => {
    it("should emit RUN_STARTED and RUN_FINISHED events", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([textDelta("Hello"), finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));

      expect(events[0]).toMatchObject({
        type: EventType.RUN_STARTED,
        threadId: "thread1",
        runId: "run1",
      });

      expect(events[events.length - 1]).toMatchObject({
        type: EventType.RUN_FINISHED,
        threadId: "thread1",
        runId: "run1",
      });
    });

    it("should emit TEXT_MESSAGE_CHUNK events for text deltas", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          textDelta("Hello"),
          textDelta(" world"),
          finish(),
        ]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));

      const textEvents = events.filter(
        (e: any) => e.type === EventType.TEXT_MESSAGE_CHUNK,
      );
      expect(textEvents).toHaveLength(2);
      expect(textEvents[0]).toMatchObject({
        type: EventType.TEXT_MESSAGE_CHUNK,
        role: "assistant",
        delta: "Hello",
      });
      expect(textEvents[1]).toMatchObject({
        type: EventType.TEXT_MESSAGE_CHUNK,
        delta: " world",
      });
    });

    it("should generate unique messageId when provider returns id '0'", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          textStart("0"), // Simulate Google Gemini returning "0"
          textDelta("First message"),
          finish(),
        ]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));

      const textEvents = events.filter(
        (e: any) => e.type === EventType.TEXT_MESSAGE_CHUNK,
      );
      expect(textEvents).toHaveLength(1);

      // Verify that messageId is NOT "0" - should be a UUID
      expect(textEvents[0].messageId).not.toBe("0");
      expect(textEvents[0].messageId).toMatch(
        /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/,
      );
    });

    it("should use provider-supplied messageId when it's not '0'", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      const validId = "msg_abc123";
      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          textStart(validId), // Valid ID from provider
          textDelta("Test message"),
          finish(),
        ]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));

      const textEvents = events.filter(
        (e: any) => e.type === EventType.TEXT_MESSAGE_CHUNK,
      );
      expect(textEvents).toHaveLength(1);

      // Verify that the valid ID from provider is used
      expect(textEvents[0].messageId).toBe(validId);
    });
  });

  describe("Tool Call Events", () => {
    it("should emit tool call lifecycle events", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          toolCallStreamingStart("call1", "testTool"),
          toolCallDelta("call1", '{"arg'),
          toolCallDelta("call1", '":"val"}'),
          toolCall("call1", "testTool", { arg: "val" }),
          toolResult("call1", "testTool", { result: "success" }),
          finish(),
        ]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));

      // Check for TOOL_CALL_START
      const startEvent = events.find(
        (e: any) => e.type === EventType.TOOL_CALL_START,
      );
      expect(startEvent).toMatchObject({
        type: EventType.TOOL_CALL_START,
        toolCallId: "call1",
        toolCallName: "testTool",
      });

      // Check for TOOL_CALL_ARGS
      const argsEvents = events.filter(
        (e: any) => e.type === EventType.TOOL_CALL_ARGS,
      );
      expect(argsEvents).toHaveLength(2);

      // Check for TOOL_CALL_END
      const endEvent = events.find(
        (e: any) => e.type === EventType.TOOL_CALL_END,
      );
      expect(endEvent).toMatchObject({
        type: EventType.TOOL_CALL_END,
        toolCallId: "call1",
      });

      // Check for TOOL_CALL_RESULT
      const resultEvent = events.find(
        (e: any) => e.type === EventType.TOOL_CALL_RESULT,
      );
      expect(resultEvent).toMatchObject({
        type: EventType.TOOL_CALL_RESULT,
        role: "tool",
        toolCallId: "call1",
      });
    });
  });

  describe("Prompt Building", () => {
    it("should not add system message when no prompt, context, or state", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [{ id: "1", role: "user", content: "Hello" }],
        tools: [],
        context: [],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.messages).toHaveLength(1);
      expect(callArgs.messages[0].role).toBe("user");
    });

    it("should prepend system message with config prompt", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        prompt: "You are a helpful assistant.",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [{ id: "1", role: "user", content: "Hello" }],
        tools: [],
        context: [],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.messages).toHaveLength(2);
      expect(callArgs.messages[0]).toMatchObject({
        role: "system",
        content: "You are a helpful assistant.",
      });
    });

    it("should include context in system message", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [
          { description: "User Name", value: "John Doe" },
          { description: "Location", value: "New York" },
        ],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      const systemMessage = callArgs.messages[0];
      expect(systemMessage.role).toBe("system");
      expect(systemMessage.content).toContain("Context from the application");
      expect(systemMessage.content).toContain("User Name");
      expect(systemMessage.content).toContain("John Doe");
      expect(systemMessage.content).toContain("Location");
      expect(systemMessage.content).toContain("New York");
    });

    it("should include state in system message", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: { counter: 0, items: ["a", "b"] },
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      const systemMessage = callArgs.messages[0];
      expect(systemMessage.role).toBe("system");
      expect(systemMessage.content).toContain("Application State");
      expect(systemMessage.content).toContain("AGUISendStateSnapshot");
      expect(systemMessage.content).toContain("AGUISendStateDelta");
      expect(systemMessage.content).toContain('"counter": 0');
      expect(systemMessage.content).toContain('"items"');
    });

    it("should combine prompt, context, and state", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        prompt: "You are helpful.",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [{ description: "Context", value: "Data" }],
        state: { value: 1 },
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      const systemMessage = callArgs.messages[0];
      expect(systemMessage.content).toContain("You are helpful.");
      expect(systemMessage.content).toContain("Context from the application");
      expect(systemMessage.content).toContain("Application State");

      // Check order: prompt, then context, then state
      const promptIndex = systemMessage.content.indexOf("You are helpful.");
      const contextIndex = systemMessage.content.indexOf(
        "Context from the application",
      );
      const stateIndex = systemMessage.content.indexOf("Application State");

      expect(promptIndex).toBeLessThan(contextIndex);
      expect(contextIndex).toBeLessThan(stateIndex);
    });
  });

  describe("Forward System/Developer Messages", () => {
    it("should ignore system messages by default", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [
          { id: "sys1", role: "system", content: "System instruction" },
          { id: "user1", role: "user", content: "Hello" },
        ],
        tools: [],
        context: [],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      // Should only have the user message, system message ignored
      expect(callArgs.messages).toHaveLength(1);
      expect(callArgs.messages[0].role).toBe("user");
    });

    it("should ignore developer messages by default", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [
          { id: "dev1", role: "developer", content: "Developer hint" },
          { id: "user1", role: "user", content: "Hello" },
        ],
        tools: [],
        context: [],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      // Should only have the user message, developer message ignored
      expect(callArgs.messages).toHaveLength(1);
      expect(callArgs.messages[0].role).toBe("user");
    });

    it("should forward system messages when forwardSystemMessages is true", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        forwardSystemMessages: true,
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [
          { id: "sys1", role: "system", content: "System instruction" },
          { id: "user1", role: "user", content: "Hello" },
        ],
        tools: [],
        context: [],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.messages).toHaveLength(2);
      expect(callArgs.messages[0]).toMatchObject({
        role: "system",
        content: "System instruction",
      });
      expect(callArgs.messages[1].role).toBe("user");
    });

    it("should forward developer messages as system when forwardDeveloperMessages is true", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        forwardDeveloperMessages: true,
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [
          { id: "dev1", role: "developer", content: "Developer hint" },
          { id: "user1", role: "user", content: "Hello" },
        ],
        tools: [],
        context: [],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.messages).toHaveLength(2);
      // Developer messages are converted to system role
      expect(callArgs.messages[0]).toMatchObject({
        role: "system",
        content: "Developer hint",
      });
      expect(callArgs.messages[1].role).toBe("user");
    });

    it("should forward both system and developer messages when both flags are true", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        forwardSystemMessages: true,
        forwardDeveloperMessages: true,
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [
          { id: "sys1", role: "system", content: "System instruction" },
          { id: "dev1", role: "developer", content: "Developer hint" },
          { id: "user1", role: "user", content: "Hello" },
        ],
        tools: [],
        context: [],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.messages).toHaveLength(3);
      expect(callArgs.messages[0]).toMatchObject({
        role: "system",
        content: "System instruction",
      });
      expect(callArgs.messages[1]).toMatchObject({
        role: "system",
        content: "Developer hint",
      });
      expect(callArgs.messages[2].role).toBe("user");
    });

    it("should place config prompt before forwarded system/developer messages", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        prompt: "You are a helpful assistant.",
        forwardSystemMessages: true,
        forwardDeveloperMessages: true,
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [
          { id: "sys1", role: "system", content: "System instruction" },
          { id: "dev1", role: "developer", content: "Developer hint" },
          { id: "user1", role: "user", content: "Hello" },
        ],
        tools: [],
        context: [],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      // Config prompt is prepended as first system message
      expect(callArgs.messages).toHaveLength(4);
      expect(callArgs.messages[0]).toMatchObject({
        role: "system",
        content: "You are a helpful assistant.",
      });
      expect(callArgs.messages[1]).toMatchObject({
        role: "system",
        content: "System instruction",
      });
      expect(callArgs.messages[2]).toMatchObject({
        role: "system",
        content: "Developer hint",
      });
      expect(callArgs.messages[3].role).toBe("user");
    });
  });

  describe("Tool Configuration", () => {
    it("should include tools from config", async () => {
      const tool1 = defineTool({
        name: "configTool",
        description: "A config tool",
        parameters: z.object({ input: z.string() }),
        execute: async () => ({ result: "ok" }),
      });

      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        tools: [tool1],
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.tools).toHaveProperty("configTool");
    });

    it("should merge config tools with input tools", async () => {
      const configTool = defineTool({
        name: "configTool",
        description: "From config",
        parameters: z.object({}),
        execute: async () => ({ result: "ok" }),
      });

      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        tools: [configTool],
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [
          {
            name: "inputTool",
            description: "From input",
            parameters: { type: "object", properties: {} },
          },
        ],
        context: [],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.tools).toHaveProperty("configTool");
      expect(callArgs.tools).toHaveProperty("inputTool");
    });

    it("should always include state update tools", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.tools).toHaveProperty("AGUISendStateSnapshot");
      expect(callArgs.tools).toHaveProperty("AGUISendStateDelta");
    });
  });

  describe("Property Overrides", () => {
    it("should respect overridable properties", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        temperature: 0.5,
        overridableProperties: ["temperature"],
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
        forwardedProps: { temperature: 0.9 },
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.temperature).toBe(0.9);
    });

    it("should ignore non-overridable properties", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        temperature: 0.5,
        overridableProperties: [], // No properties can be overridden
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
        forwardedProps: { temperature: 0.9 },
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.temperature).toBe(0.5); // Original value, not overridden
    });
  });

  describe("Error Handling", () => {
    it("should emit RUN_ERROR event on failure", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockImplementation(() => {
        throw new Error("Test error");
      });

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      try {
        await collectEvents(agent["run"](input));
        expect.fail("Should have thrown");
      } catch (error: any) {
        // Error is expected - check that we got a RUN_ERROR event
        // Note: The error is thrown after emitting the event
        expect(error.message).toContain("Test error");
      }
    });
  });

  describe("Reasoning Event Emission", () => {
    it("should emit full reasoning lifecycle events", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta("Let me think..."),
          reasoningDelta(" about this."),
          reasoningEnd(),
          finish(),
        ]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));

      // Verify event order
      const eventTypes = events.map((e: any) => e.type);
      expect(eventTypes[0]).toBe(EventType.RUN_STARTED);

      const reasoningStartIdx = eventTypes.indexOf(EventType.REASONING_START);
      const reasoningMsgStartIdx = eventTypes.indexOf(
        EventType.REASONING_MESSAGE_START,
      );
      const reasoningContentIndices = eventTypes.reduce(
        (acc: number[], type: string, idx: number) =>
          type === EventType.REASONING_MESSAGE_CONTENT ? [...acc, idx] : acc,
        [],
      );
      const reasoningMsgEndIdx = eventTypes.indexOf(
        EventType.REASONING_MESSAGE_END,
      );
      const reasoningEndIdx = eventTypes.indexOf(EventType.REASONING_END);

      expect(reasoningStartIdx).toBeGreaterThan(0);
      expect(reasoningMsgStartIdx).toBeGreaterThan(reasoningStartIdx);
      expect(reasoningContentIndices).toHaveLength(2);
      expect(reasoningContentIndices[0]).toBeGreaterThan(reasoningMsgStartIdx);
      expect(reasoningMsgEndIdx).toBeGreaterThan(
        reasoningContentIndices[reasoningContentIndices.length - 1],
      );
      expect(reasoningEndIdx).toBeGreaterThan(reasoningMsgEndIdx);

      // Verify consistent messageId across all reasoning events
      const reasoningEvents = events.filter((e: any) =>
        [
          EventType.REASONING_START,
          EventType.REASONING_MESSAGE_START,
          EventType.REASONING_MESSAGE_CONTENT,
          EventType.REASONING_MESSAGE_END,
          EventType.REASONING_END,
        ].includes(e.type),
      );
      const messageIds = reasoningEvents.map((e: any) => e.messageId);
      expect(new Set(messageIds).size).toBe(1);

      // Verify REASONING_MESSAGE_START has role "reasoning"
      const msgStartEvent = events.find(
        (e: any) => e.type === EventType.REASONING_MESSAGE_START,
      );
      expect(msgStartEvent).toMatchObject({ role: "reasoning" });

      // Verify content deltas
      const contentEvents = events.filter(
        (e: any) => e.type === EventType.REASONING_MESSAGE_CONTENT,
      );
      expect(contentEvents[0]).toMatchObject({ delta: "Let me think..." });
      expect(contentEvents[1]).toMatchObject({ delta: " about this." });

      // Verify last event is RUN_FINISHED
      expect(eventTypes[eventTypes.length - 1]).toBe(EventType.RUN_FINISHED);
    });

    it("should emit reasoning events followed by text events", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta("thinking"),
          reasoningEnd(),
          textDelta("Hello"),
          finish(),
        ]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));
      const eventTypes = events.map((e: any) => e.type);

      // Reasoning events should come before text events
      const reasoningEndIdx = eventTypes.indexOf(EventType.REASONING_END);
      const textChunkIdx = eventTypes.indexOf(EventType.TEXT_MESSAGE_CHUNK);
      expect(reasoningEndIdx).toBeLessThan(textChunkIdx);

      // Reasoning messageId should differ from text messageId
      const reasoningEvent = events.find(
        (e: any) => e.type === EventType.REASONING_START,
      );
      const textEvent = events.find(
        (e: any) => e.type === EventType.TEXT_MESSAGE_CHUNK,
      );
      expect(reasoningEvent.messageId).not.toBe(textEvent.messageId);
    });

    it("should use provider-supplied reasoning id", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart("reasoning-msg-123"),
          reasoningDelta("content"),
          reasoningEnd(),
          finish(),
        ]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));

      const reasoningEvents = events.filter((e: any) =>
        [
          EventType.REASONING_START,
          EventType.REASONING_MESSAGE_START,
          EventType.REASONING_MESSAGE_CONTENT,
          EventType.REASONING_MESSAGE_END,
          EventType.REASONING_END,
        ].includes(e.type),
      );

      for (const event of reasoningEvents) {
        expect(event.messageId).toBe("reasoning-msg-123");
      }
    });

    it("should generate unique reasoningMessageId when provider returns id '0'", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart("0"),
          reasoningDelta("content"),
          reasoningEnd(),
          finish(),
        ]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));

      const reasoningEvent = events.find(
        (e: any) => e.type === EventType.REASONING_START,
      );
      expect(reasoningEvent.messageId).not.toBe("0");
      expect(reasoningEvent.messageId).toMatch(
        /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/,
      );
    });

    it("should handle empty reasoning content", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta(""),
          reasoningEnd(),
          finish(),
        ]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));

      // Empty delta must NOT be emitted — EventSchemas rejects delta: ""
      const contentEvents = events.filter(
        (e: any) => e.type === EventType.REASONING_MESSAGE_CONTENT,
      );
      expect(contentEvents).toHaveLength(0);

      // Full lifecycle should still complete
      const eventTypes = events.map((e: any) => e.type);
      expect(eventTypes).toContain(EventType.REASONING_START);
      expect(eventTypes).toContain(EventType.REASONING_MESSAGE_START);
      expect(eventTypes).toContain(EventType.REASONING_MESSAGE_END);
      expect(eventTypes).toContain(EventType.REASONING_END);
      expect(eventTypes).toContain(EventType.RUN_FINISHED);
    });

    it("should handle reasoning-only stream (no text output)", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta("Deep thought"),
          reasoningEnd(),
          finish(),
        ]),
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));

      // No TEXT_MESSAGE_CHUNK events
      const textEvents = events.filter(
        (e: any) => e.type === EventType.TEXT_MESSAGE_CHUNK,
      );
      expect(textEvents).toHaveLength(0);

      // Reasoning events are present
      const reasoningContentEvents = events.filter(
        (e: any) => e.type === EventType.REASONING_MESSAGE_CONTENT,
      );
      expect(reasoningContentEvents).toHaveLength(1);
      expect(reasoningContentEvents[0]).toMatchObject({
        delta: "Deep thought",
      });
    });

    it("should skip empty reasoning deltas and continue stream", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta(""),
          reasoningEnd(),
          finish(),
        ]),
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));

      // No REASONING_MESSAGE_CONTENT events — empty delta skipped
      const contentEvents = events.filter(
        (e) => e.type === EventType.REASONING_MESSAGE_CONTENT,
      );
      expect(contentEvents).toHaveLength(0);

      // Stream still completes with RUN_FINISHED
      const eventTypes = events.map((e) => e.type);
      expect(eventTypes[eventTypes.length - 1]).toBe(EventType.RUN_FINISHED);
    });

    it("should auto-close reasoning when SDK omits reasoning-end before tool call", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta("Thinking..."),
          // NO reasoningEnd() — simulates @ai-sdk/anthropic behaviour
          toolCallStreamingStart("call1", "testTool"),
          toolCallDelta("call1", '{"arg":"val"}'),
          toolCall("call1", "testTool", { arg: "val" }),
          toolResult("call1", "testTool", { result: "success" }),
          finish(),
        ]),
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));
      const eventTypes = events.map((e) => e.type);

      // REASONING_MESSAGE_END must appear before REASONING_END, which must appear before TOOL_CALL_START
      const reasoningMsgEndIdx = eventTypes.indexOf(
        EventType.REASONING_MESSAGE_END,
      );
      const reasoningEndIdx = eventTypes.indexOf(EventType.REASONING_END);
      const toolCallStartIdx = eventTypes.indexOf(EventType.TOOL_CALL_START);
      expect(reasoningMsgEndIdx).toBeGreaterThan(0);
      expect(reasoningEndIdx).toBeGreaterThan(reasoningMsgEndIdx);
      expect(reasoningEndIdx).toBeLessThan(toolCallStartIdx);

      // Each close event must appear exactly once (guard against double-emit)
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_MESSAGE_END),
      ).toHaveLength(1);
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_END),
      ).toHaveLength(1);

      // Stream still completes with RUN_FINISHED
      expect(eventTypes[eventTypes.length - 1]).toBe(EventType.RUN_FINISHED);
    });

    it("should auto-close reasoning when SDK omits reasoning-end before text", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta("Let me think"),
          // NO reasoningEnd() — simulates @ai-sdk/anthropic behaviour
          textStart(),
          textDelta("Answer"),
          finish(),
        ]),
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));
      const eventTypes = events.map((e) => e.type);

      // REASONING_MESSAGE_END must appear before REASONING_END, which must appear before TEXT_MESSAGE_CHUNK
      const reasoningMsgEndIdx = eventTypes.indexOf(
        EventType.REASONING_MESSAGE_END,
      );
      const reasoningEndIdx = eventTypes.indexOf(EventType.REASONING_END);
      const textChunkIdx = eventTypes.indexOf(EventType.TEXT_MESSAGE_CHUNK);
      expect(reasoningMsgEndIdx).toBeGreaterThan(0);
      expect(reasoningEndIdx).toBeGreaterThan(reasoningMsgEndIdx);
      expect(reasoningEndIdx).toBeLessThan(textChunkIdx);

      // Each close event must appear exactly once (guard against double-emit)
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_MESSAGE_END),
      ).toHaveLength(1);
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_END),
      ).toHaveLength(1);

      // Stream still completes with RUN_FINISHED
      expect(eventTypes[eventTypes.length - 1]).toBe(EventType.RUN_FINISHED);
    });

    it("should auto-close reasoning when SDK omits reasoning-end before finish", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta("Deep thought"),
          // NO reasoningEnd() — simulates @ai-sdk/anthropic behaviour
          finish(),
        ]),
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));
      const eventTypes = events.map((e) => e.type);

      // REASONING_MESSAGE_END must appear before REASONING_END (auto-closed by finish case)
      const reasoningMsgEndIdx = eventTypes.indexOf(
        EventType.REASONING_MESSAGE_END,
      );
      const reasoningEndIdx = eventTypes.indexOf(EventType.REASONING_END);
      expect(reasoningMsgEndIdx).toBeGreaterThan(0);
      expect(reasoningEndIdx).toBeGreaterThan(reasoningMsgEndIdx);

      // Each close event must appear exactly once (guard against double-emit)
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_MESSAGE_END),
      ).toHaveLength(1);
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_END),
      ).toHaveLength(1);

      // Stream still completes with RUN_FINISHED
      expect(eventTypes[eventTypes.length - 1]).toBe(EventType.RUN_FINISHED);
    });

    it("should auto-close reasoning when stream aborts mid-reasoning", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta("Thinking..."),
          // NO reasoningEnd() — stream aborts before SDK can close reasoning
          abort(),
        ]),
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));
      const eventTypes = events.map((e) => e.type);

      // REASONING_MESSAGE_END must appear before REASONING_END, both before RUN_FINISHED
      const reasoningMsgEndIdx = eventTypes.indexOf(
        EventType.REASONING_MESSAGE_END,
      );
      const reasoningEndIdx = eventTypes.indexOf(EventType.REASONING_END);
      const runFinishedIdx = eventTypes.indexOf(EventType.RUN_FINISHED);
      expect(reasoningMsgEndIdx).toBeGreaterThan(0);
      expect(reasoningEndIdx).toBeGreaterThan(reasoningMsgEndIdx);
      expect(runFinishedIdx).toBeGreaterThan(reasoningEndIdx);

      // Each close event must appear exactly once (guard against double-emit)
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_MESSAGE_END),
      ).toHaveLength(1);
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_END),
      ).toHaveLength(1);

      // Stream still completes with RUN_FINISHED
      expect(eventTypes[eventTypes.length - 1]).toBe(EventType.RUN_FINISHED);
    });

    it("should auto-close reasoning when stream errors mid-reasoning", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta("Thinking..."),
          // NO reasoningEnd() — stream errors before SDK can close reasoning
          error("stream failed"),
        ]),
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      // subscriber.error() causes collectEvents to reject, so collect manually
      const events: BaseEvent[] = [];
      await new Promise<void>((resolve) => {
        agent["run"](input).subscribe({
          next: (e) => events.push(e),
          error: () => resolve(), // error is expected
          complete: () => resolve(),
        });
      });

      const eventTypes = events.map((e) => e.type);

      // REASONING_MESSAGE_END must appear before REASONING_END, both before RUN_ERROR
      const reasoningMsgEndIdx = eventTypes.indexOf(
        EventType.REASONING_MESSAGE_END,
      );
      const reasoningEndIdx = eventTypes.indexOf(EventType.REASONING_END);
      const runErrorIdx = eventTypes.indexOf(EventType.RUN_ERROR);
      expect(reasoningMsgEndIdx).toBeGreaterThan(0);
      expect(reasoningEndIdx).toBeGreaterThan(reasoningMsgEndIdx);
      expect(runErrorIdx).toBeGreaterThan(reasoningEndIdx);

      // Each close event must appear exactly once (guard against double-emit)
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_MESSAGE_END),
      ).toHaveLength(1);
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_END),
      ).toHaveLength(1);
    });

    it("should auto-close reasoning for consecutive blocks with no reasoning-end between them", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta("First thought"),
          // NO reasoningEnd() — second block starts immediately
          reasoningStart(),
          reasoningDelta("Second thought"),
          reasoningEnd(),
          finish(),
        ]),
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));
      const eventTypes = events.map((e) => e.type);

      // Both reasoning blocks must be properly closed — two complete lifecycles
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_MESSAGE_END),
      ).toHaveLength(2);
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_END),
      ).toHaveLength(2);

      // First block's REASONING_END must appear before second block's REASONING_START
      const firstReasoningEndIdx = eventTypes.indexOf(EventType.REASONING_END);
      const secondReasoningStartIdx = eventTypes.lastIndexOf(
        EventType.REASONING_START,
      );
      expect(firstReasoningEndIdx).toBeLessThan(secondReasoningStartIdx);

      // The two blocks must use distinct messageIds
      const startEvents = events.filter(
        (e): e is ReasoningStartEvent => e.type === EventType.REASONING_START,
      );
      expect(startEvents).toHaveLength(2);
      expect(startEvents[0].messageId).not.toBe(startEvents[1].messageId);

      expect(eventTypes[eventTypes.length - 1]).toBe(EventType.RUN_FINISHED);
    });

    it("should close reasoning when an exception is thrown mid-stream", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      // Simulate the fullStream generator throwing mid-iteration (not a stream error event)
      const throwingStream = {
        fullStream: (async function* () {
          yield reasoningStart();
          yield reasoningDelta("Thinking...");
          throw new Error("unexpected network failure");
        })(),
      };
      vi.mocked(streamText).mockReturnValue(
        throwingStream as unknown as ReturnType<typeof streamText>,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      // subscriber.error() causes collectEvents to reject, so collect manually
      const events: BaseEvent[] = [];
      await new Promise<void>((resolve) => {
        agent["run"](input).subscribe({
          next: (e) => events.push(e),
          error: () => resolve(), // error is expected
          complete: () => resolve(),
        });
      });

      const eventTypes = events.map((e) => e.type);

      // Reasoning must be closed before RUN_ERROR despite the exception path
      const reasoningMsgEndIdx = eventTypes.indexOf(
        EventType.REASONING_MESSAGE_END,
      );
      const reasoningEndIdx = eventTypes.indexOf(EventType.REASONING_END);
      const runErrorIdx = eventTypes.indexOf(EventType.RUN_ERROR);
      expect(reasoningMsgEndIdx).toBeGreaterThan(0);
      expect(reasoningEndIdx).toBeGreaterThan(reasoningMsgEndIdx);
      expect(runErrorIdx).toBeGreaterThan(reasoningEndIdx);

      expect(
        eventTypes.filter((t) => t === EventType.REASONING_MESSAGE_END),
      ).toHaveLength(1);
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_END),
      ).toHaveLength(1);
    });

    it("should close reasoning and emit RUN_FINISHED when stream exhausts without terminal event", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      // Stream ends with no finish/abort/error — exercises !terminalEventEmitted fallback
      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta("Thinking..."),
          // deliberate: no finish(), no abort(), no error()
        ]),
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));
      const eventTypes = events.map((e) => e.type);

      // Reasoning must be closed before RUN_FINISHED via fallback
      const reasoningMsgEndIdx = eventTypes.indexOf(
        EventType.REASONING_MESSAGE_END,
      );
      const reasoningEndIdx = eventTypes.indexOf(EventType.REASONING_END);
      const runFinishedIdx = eventTypes.indexOf(EventType.RUN_FINISHED);
      expect(reasoningMsgEndIdx).toBeGreaterThan(0);
      expect(reasoningEndIdx).toBeGreaterThan(reasoningMsgEndIdx);
      expect(runFinishedIdx).toBeGreaterThan(reasoningEndIdx);

      expect(
        eventTypes.filter((t) => t === EventType.REASONING_MESSAGE_END),
      ).toHaveLength(1);
      expect(
        eventTypes.filter((t) => t === EventType.REASONING_END),
      ).toHaveLength(1);

      expect(eventTypes[eventTypes.length - 1]).toBe(EventType.RUN_FINISHED);
    });

    it("should handle reasoning interleaved with tool calls", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([
          reasoningStart(),
          reasoningDelta("I need to call a tool"),
          reasoningEnd(),
          toolCallStreamingStart("call1", "testTool"),
          toolCallDelta("call1", '{"arg":"val"}'),
          toolCall("call1", "testTool", { arg: "val" }),
          toolResult("call1", "testTool", { result: "success" }),
          finish(),
        ]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      const events = await collectEvents(agent["run"](input));
      const eventTypes = events.map((e) => e.type);

      // Reasoning events precede tool call events
      const reasoningEndIdx = eventTypes.indexOf(EventType.REASONING_END);
      const toolCallStartIdx = eventTypes.indexOf(EventType.TOOL_CALL_START);
      expect(reasoningEndIdx).toBeLessThan(toolCallStartIdx);

      // Both lifecycles complete
      expect(eventTypes).toContain(EventType.REASONING_START);
      expect(eventTypes).toContain(EventType.REASONING_END);
      expect(eventTypes).toContain(EventType.TOOL_CALL_START);
      expect(eventTypes).toContain(EventType.TOOL_CALL_END);
    });
  });

  describe("Provider Options", () => {
    it("should pass providerOptions to streamText", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        providerOptions: {
          openai: { reasoningEffort: "high", reasoningSummary: "detailed" },
        },
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.providerOptions).toEqual({
        openai: { reasoningEffort: "high", reasoningSummary: "detailed" },
      });
    });

    it("should allow providerOptions override via forwardedProps when overridable", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        providerOptions: {
          openai: { reasoningEffort: "low" },
        },
        overridableProperties: ["providerOptions"],
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
        forwardedProps: {
          providerOptions: {
            openai: { reasoningEffort: "high" },
          },
        },
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.providerOptions).toEqual({
        openai: { reasoningEffort: "high" },
      });
    });

    it("should NOT allow providerOptions override when not in overridableProperties", async () => {
      const agent = new BasicAgent({
        model: "openai/gpt-4o",
        providerOptions: {
          openai: { reasoningEffort: "low" },
        },
        overridableProperties: [],
      });

      vi.mocked(streamText).mockReturnValue(
        mockStreamTextResponse([finish()]) as any,
      );

      const input: RunAgentInput = {
        threadId: "thread1",
        runId: "run1",
        messages: [],
        tools: [],
        context: [],
        state: {},
        forwardedProps: {
          providerOptions: {
            openai: { reasoningEffort: "high" },
          },
        },
      };

      await collectEvents(agent["run"](input));

      const callArgs = vi.mocked(streamText).mock.calls[0][0];
      expect(callArgs.providerOptions).toEqual({
        openai: { reasoningEffort: "low" },
      });
    });
  });
});