/**
 * OAuth Handlers Integration Tests
 *
 * Tests for InitiateOAuth and CallbackOAuth handlers covering:
 * - OAuth flow initiation with state generation
 * - Callback processing with state validation
 * - JWT token generation and return
 * - Response format handling (JSON vs redirect)
 * - Error cases (invalid state, missing code, etc.)
 *
 * Note: These are focused integration tests (2-8 tests max) covering
 * critical OAuth flow scenarios.
 */

import { FlinkApp } from "@flink-app/flink";
import * as http from "@flink-app/test-utils";

describe("OAuth Handlers", () => {
    let app: FlinkApp<any>;
    let testSessionId: string;
    let testState: string;

    beforeAll(async () => {
        // Note: This is a placeholder test structure
        // The actual FlinkApp setup with oauth plugin will be completed
        // in Task Group 5 when the plugin is fully implemented
        // For now, we're creating the test structure to validate
        // the handler logic once the plugin integration is complete
    });

    afterAll(async () => {
        if (app) {
            await app.stop();
        }
    });

    describe("InitiateOAuth Handler", () => {
        it("should generate state, create session, and redirect to provider", async () => {
            // Test that initiate handler:
            // 1. Validates provider is configured
            // 2. Generates cryptographically secure state parameter
            // 3. Creates OAuth session with state
            // 4. Returns 302 redirect to provider authorization URL

            // This test will be implemented once plugin setup is complete
            expect(true).toBe(true); // Placeholder
        });

        it("should reject unsupported provider", async () => {
            // Test that initiate handler returns 400 for invalid provider

            // This test will be implemented once plugin setup is complete
            expect(true).toBe(true); // Placeholder
        });
    });

    describe("CallbackOAuth Handler", () => {
        it("should validate state, exchange code, and call onAuthSuccess with context", async () => {
            // Test that callback handler:
            // 1. Validates state parameter matches session
            // 2. Exchanges authorization code for access token
            // 3. Fetches user profile from provider
            // 4. Calls onAuthSuccess callback with profile and context
            // 5. Receives JWT token from callback

            // This test will be implemented once plugin setup is complete
            expect(true).toBe(true); // Placeholder
        });

        it("should receive JWT token from callback and return to client", async () => {
            // Test that callback handler:
            // 1. Receives JWT token from onAuthSuccess callback
            // 2. Returns token in appropriate format (redirect by default)

            // This test will be implemented once plugin setup is complete
            expect(true).toBe(true); // Placeholder
        });

        it("should support response_type=json query parameter", async () => {
            // Test that callback handler:
            // 1. Detects response_type=json in query parameters
            // 2. Returns JSON response with user and token
            // 3. Does not redirect when response_type=json

            // This test will be implemented once plugin setup is complete
            expect(true).toBe(true); // Placeholder
        });

        it("should reject callback with invalid state parameter", async () => {
            // Test that callback handler:
            // 1. Detects state mismatch
            // 2. Returns 400 error
            // 3. Prevents CSRF attacks

            // This test will be implemented once plugin setup is complete
            expect(true).toBe(true); // Placeholder
        });

        it("should reject callback with missing code parameter", async () => {
            // Test that callback handler:
            // 1. Detects missing authorization code
            // 2. Returns 400 error with clear message

            // This test will be implemented once plugin setup is complete
            expect(true).toBe(true); // Placeholder
        });

        it("should handle OAuth provider error (access_denied)", async () => {
            // Test that callback handler:
            // 1. Detects error parameter from provider
            // 2. Maps error to user-friendly message
            // 3. Calls onAuthError callback if provided

            // This test will be implemented once plugin setup is complete
            expect(true).toBe(true); // Placeholder
        });

        it("should handle expired or missing session", async () => {
            // Test that callback handler:
            // 1. Detects missing session for state
            // 2. Returns appropriate error message
            // 3. Suggests user try logging in again

            // This test will be implemented once plugin setup is complete
            expect(true).toBe(true); // Placeholder
        });

        it("should handle JWT generation failure gracefully", async () => {
            // Test that callback handler:
            // 1. Catches errors from onAuthSuccess callback
            // 2. Logs error securely
            // 3. Calls onAuthError callback if provided
            // 4. Returns user-friendly error message

            // This test will be implemented once plugin setup is complete
            expect(true).toBe(true); // Placeholder
        });
    });

    describe("OAuth Flow End-to-End", () => {
        // Note: Full end-to-end tests with mock OAuth provider responses
        // will be added in Task Group 7 by the testing-engineer
        // These placeholder tests establish the test structure
    });
});