import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
import { mkdtempSync, rmSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import agentBrowserSetupExtension, { ensureAgentBrowser, INSTALL_COMMAND, isAgentBrowserInstalled } from "./agent-browser.ts";

type ExecResult = { code: number; stdout: string; stderr: string; killed: boolean };

function makePi(execImpl?: (command: string, args: string[], opts?: { timeout?: number }) => Promise<ExecResult>) {
	const handlers = new Map<string, Function[]>();
	const commands = new Map<string, any>();
	const exec = vi.fn(
		execImpl ?? (async () => ({ code: 0, stdout: "", stderr: "", killed: false }) as ExecResult),
	);
	const pi = {
		exec,
		on: (evt: string, h: Function) => {
			handlers.set(evt, [...(handlers.get(evt) ?? []), h]);
		},
		registerCommand: (name: string, options: any) => {
			commands.set(name, options);
		},
	};
	return { pi: pi as any, handlers, commands, exec };
}

function makeCtx(overrides?: Partial<{ hasUI: boolean; confirmResult: boolean }>) {
	const ui = {
		confirm: vi.fn(async () => overrides?.confirmResult ?? true),
		notify: vi.fn(),
	};
	return { hasUI: overrides?.hasUI ?? true, ui } as any;
}

function runSetupCommand(commands: Map<string, any>, ctx: unknown): Promise<void> {
	const command = commands.get("setup-agent-browser");
	if (!command) throw new Error("no setup-agent-browser command registered");
	return command.handler("", ctx);
}

const ok: ExecResult = { code: 0, stdout: "", stderr: "", killed: false };
const fail: ExecResult = { code: 1, stdout: "", stderr: "command not found", killed: false };

let tmpDir: string;

beforeAll(() => {
	tmpDir = mkdtempSync(join(tmpdir(), "agent-browser-test-"));
	process.env.SELESAI_CODING_AGENT_DIR = tmpDir;
	process.env.PI_CODING_AGENT_DIR = tmpDir;
});

afterEach(() => {
	vi.restoreAllMocks();
});

afterAll(() => {
	delete process.env.SELESAI_CODING_AGENT_DIR;
	delete process.env.PI_CODING_AGENT_DIR;
	rmSync(tmpDir, { recursive: true, force: true });
});

describe("agent-browser setup extension", () => {
	it("asks nothing at startup and only registers the setup-agent-browser command", async () => {
		const { pi, handlers, commands, exec } = makePi();
		await agentBrowserSetupExtension(pi);
		expect(handlers.size).toBe(0);
		expect(commands.has("setup-agent-browser")).toBe(true);
		expect(exec).not.toHaveBeenCalled();
	});

	it("does not prompt when the CLI is already installed", async () => {
		const { pi, commands, exec } = makePi();
		await agentBrowserSetupExtension(pi);
		const ctx = makeCtx();
		await runSetupCommand(commands, ctx);

		expect(exec).toHaveBeenCalledTimes(1);
		const args = exec.mock.calls[0][1] as string[];
		expect(args.join(" ")).toContain("--version");
		expect(ctx.ui.confirm).not.toHaveBeenCalled();
		expect(ctx.ui.notify).toHaveBeenCalledWith(expect.stringContaining("already installed"), "info");
	});

	it("installs via npm when the user confirms, then provisions the browser", async () => {
		const execImpl = vi
			.fn()
			.mockResolvedValueOnce(fail) // probe: missing
			.mockResolvedValueOnce(ok) // npm i -g agent-browser
			.mockResolvedValueOnce(ok) // probe: now present
			.mockResolvedValueOnce(ok); // agent-browser install
		const { pi, commands, exec } = makePi(execImpl as any);
		await agentBrowserSetupExtension(pi);
		const ctx = makeCtx();
		await runSetupCommand(commands, ctx);

		expect(ctx.ui.confirm).toHaveBeenCalledWith(expect.stringContaining("Install agent-browser?"), expect.any(String));
		expect(exec).toHaveBeenCalledTimes(4);
		const calls = exec.mock.calls.map(([command, args]) => [command, ...(args as string[])].join(" "));
		expect(calls[0]).toContain("--version");
		expect(calls[1]).toContain("npm");
		expect(calls[1]).toContain("agent-browser");
		expect(calls[2]).toContain("--version");
		expect(calls[3]).toBe(`${process.platform === "win32" ? "cmd /c " : ""}agent-browser install`);
		expect(ctx.ui.notify).toHaveBeenCalledWith(expect.stringContaining("browser provisioned"), "info");
	});

	it("notifies how to install later when the user says no", async () => {
		const execImpl = vi.fn().mockResolvedValue(fail);
		const { pi, commands, exec } = makePi(execImpl as any);
		await agentBrowserSetupExtension(pi);
		const ctx = makeCtx({ confirmResult: false });
		await runSetupCommand(commands, ctx);

		expect(exec).toHaveBeenCalledTimes(1); // probe only
		expect(ctx.ui.notify).toHaveBeenCalledWith(expect.stringContaining("Skipped"), "info");
	});

	it("warns with install instructions when there is no UI", async () => {
		const warnSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
		const execImpl = vi.fn().mockResolvedValue(fail);
		const { pi, commands } = makePi(execImpl as any);
		await agentBrowserSetupExtension(pi);
		const ctx = makeCtx({ hasUI: false });
		await runSetupCommand(commands, ctx);

		expect(ctx.ui.confirm).not.toHaveBeenCalled();
		expect(warnSpy).toHaveBeenCalledWith(expect.stringContaining(INSTALL_COMMAND));
	});

	it("reports a failed npm install and skips browser provisioning", async () => {
		const execImpl = vi
			.fn()
			.mockResolvedValueOnce(fail) // probe
			.mockResolvedValueOnce({ code: 1, stdout: "", stderr: "EACCES", killed: false }); // npm fails
		const { pi, commands, exec } = makePi(execImpl as any);
		await agentBrowserSetupExtension(pi);
		const ctx = makeCtx();
		await runSetupCommand(commands, ctx);

		expect(ctx.ui.notify).toHaveBeenCalledWith(expect.stringContaining("failed"), "error");
		expect(exec).toHaveBeenCalledTimes(2);
		expect(exec.mock.calls.some((c) => (c[1] as string[]).join(" ").endsWith("agent-browser install"))).toBe(false);
	});

	it("isAgentBrowserInstalled reports the probe result", async () => {
		const { pi, exec } = makePi(async () => ok);
		expect(await isAgentBrowserInstalled(pi)).toBe(true);
		expect(exec).toHaveBeenCalledTimes(1);

		const { pi: pi2, exec: exec2 } = makePi(async () => fail);
		expect(await isAgentBrowserInstalled(pi2)).toBe(false);
		expect(exec2).toHaveBeenCalledTimes(1);
	});

	it("setup-agent-browser command re-runs the flow", async () => {
		const { pi, commands } = makePi(async () => ok);
		await agentBrowserSetupExtension(pi);
		const command = commands.get("setup-agent-browser");
		expect(command).toBeDefined();
		const ctx = makeCtx();
		await command.handler("", ctx);
		expect(ctx.ui.notify).toHaveBeenCalledWith(expect.stringContaining("already installed"), "info");
	});

	it("isAgentBrowserInstalled returns false when exec throws", async () => {
		const { pi } = makePi(async () => {
			throw new Error("spawn failed");
		});
		expect(await isAgentBrowserInstalled(pi)).toBe(false);
	});

	it("isAgentBrowserInstalled returns false when the probe is killed", async () => {
		const { pi } = makePi(async () => ({ code: 0, stdout: "", stderr: "", killed: true }));
		expect(await isAgentBrowserInstalled(pi)).toBe(false);
	});

	it("reports a timed-out npm install", async () => {
		const execImpl = vi
			.fn()
			.mockResolvedValueOnce(fail) // probe: missing
			.mockResolvedValueOnce({ code: 0, stdout: "", stderr: "", killed: true }); // npm killed
		const { pi, commands, exec } = makePi(execImpl as any);
		await agentBrowserSetupExtension(pi);
		const ctx = makeCtx();
		await runSetupCommand(commands, ctx);

		expect(ctx.ui.notify).toHaveBeenCalledWith(expect.stringContaining("timed out"), "error");
		expect(exec).toHaveBeenCalledTimes(2);
	});

	it("reports npm success but missing binary on PATH", async () => {
		const execImpl = vi
			.fn()
			.mockResolvedValueOnce(fail) // probe: missing
			.mockResolvedValueOnce(ok) // npm i -g agent-browser
			.mockResolvedValueOnce(fail) // probe: still missing
			.mockResolvedValueOnce(ok); // (unused)
		const { pi, commands, exec } = makePi(execImpl as any);
		await agentBrowserSetupExtension(pi);
		const ctx = makeCtx();
		await runSetupCommand(commands, ctx);

		expect(ctx.ui.notify).toHaveBeenCalledWith(expect.stringContaining("still not on PATH"), "warning");
		expect(exec).toHaveBeenCalledTimes(3);
	});

	it("warns when browser provisioning fails after install", async () => {
		const execImpl = vi
			.fn()
			.mockResolvedValueOnce(fail) // probe: missing
			.mockResolvedValueOnce(ok) // npm i -g agent-browser
			.mockResolvedValueOnce(ok) // probe: now present
			.mockResolvedValueOnce({ code: 1, stdout: "", stderr: "browser failed", killed: false }); // agent-browser install fails
		const { pi, commands, exec } = makePi(execImpl as any);
		await agentBrowserSetupExtension(pi);
		const ctx = makeCtx();
		await runSetupCommand(commands, ctx);

		expect(ctx.ui.notify).toHaveBeenCalledWith(expect.stringContaining("Run `agent-browser install`"), "info");
		expect(exec).toHaveBeenCalledTimes(4);
	});

	it("provisionBrowser returns false when exec throws", async () => {
		const execImpl = vi
			.fn()
			.mockResolvedValueOnce(fail) // probe: missing
			.mockResolvedValueOnce(ok) // npm i -g agent-browser
			.mockResolvedValueOnce(ok) // probe: now present
			.mockRejectedValueOnce(new Error("spawn failed")); // agent-browser install throws
		const { pi, commands, exec } = makePi(execImpl as any);
		await agentBrowserSetupExtension(pi);
		const ctx = makeCtx();
		await runSetupCommand(commands, ctx);

		expect(ctx.ui.notify).toHaveBeenCalledWith(expect.stringContaining("Run `agent-browser install`"), "info");
		expect(exec).toHaveBeenCalledTimes(4);
	});

	it("ensureAgentBrowser returns false when the user declines", async () => {
		const execImpl = vi.fn().mockResolvedValue(fail);
		const { pi } = makePi(execImpl as any);
		const ctx = makeCtx({ confirmResult: false });
		expect(await ensureAgentBrowser(pi, ctx)).toBe(false);
	});

	it("ensureAgentBrowser returns true when already installed", async () => {
		const { pi } = makePi(async () => ok);
		expect(await ensureAgentBrowser(pi, makeCtx())).toBe(true);
	});

	it("ensureAgentBrowser returns false without UI", async () => {
		const warnSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
		const execImpl = vi.fn().mockResolvedValue(fail);
		const { pi } = makePi(execImpl as any);
		expect(await ensureAgentBrowser(pi, makeCtx({ hasUI: false }))).toBe(false);
		expect(warnSpy).toHaveBeenCalledWith(expect.stringContaining(INSTALL_COMMAND));
	});

	it("ensureAgentBrowser returns false when npm install fails", async () => {
		const execImpl = vi
			.fn()
			.mockResolvedValueOnce(fail) // probe
			.mockResolvedValueOnce({ code: 1, stdout: "", stderr: "EACCES", killed: false }); // npm fails
		const { pi } = makePi(execImpl as any);
		expect(await ensureAgentBrowser(pi, makeCtx())).toBe(false);
	});

	it("npm install failure surfaces stdout when stderr is empty", async () => {
		const execImpl = vi
			.fn()
			.mockResolvedValueOnce(fail) // probe
			.mockResolvedValueOnce({ code: 1, stdout: "npm error log", stderr: "", killed: false }); // npm fails with stdout only
		const { pi } = makePi(execImpl as any);
		const ctx = makeCtx();
		expect(await ensureAgentBrowser(pi, ctx)).toBe(false);
		expect(ctx.ui.notify).toHaveBeenCalledWith(expect.stringContaining("npm error log"), "error");
	});

	it("npm install failure falls back to exit status when output is empty", async () => {
		const execImpl = vi
			.fn()
			.mockResolvedValueOnce(fail) // probe
			.mockResolvedValueOnce({ code: 1, stdout: "", stderr: "", killed: false }); // npm fails with no output
		const { pi } = makePi(execImpl as any);
		const ctx = makeCtx();
		expect(await ensureAgentBrowser(pi, ctx)).toBe(false);
		expect(ctx.ui.notify).toHaveBeenCalledWith(expect.stringContaining("exit status 1"), "error");
	});

	it("notify is a no-op without UI even when the CLI is installed", async () => {
		const { pi } = makePi(async () => ok);
		const ctx = makeCtx({ hasUI: false });
		expect(await ensureAgentBrowser(pi, ctx)).toBe(true);
	});

	it("ensureAgentBrowser returns true after full install flow", async () => {
		const execImpl = vi
			.fn()
			.mockResolvedValueOnce(fail) // probe: missing
			.mockResolvedValueOnce(ok) // npm i -g agent-browser
			.mockResolvedValueOnce(ok) // probe: now present
			.mockResolvedValueOnce(ok); // agent-browser install
		const { pi } = makePi(execImpl as any);
		expect(await ensureAgentBrowser(pi, makeCtx())).toBe(true);
	});

	it("cliCommand wraps args in cmd.exe on win32", () => {
		const original = process.platform;
		Object.defineProperty(process, "platform", { value: "win32" });
		try {
			const { ensureAgentBrowser: _e, ...rest } = {} as any;
			// Re-import to pick up the platform at module scope is not needed;
			// cliCommand is module-private, so exercise it through the public flow.
			const execImpl = vi.fn().mockResolvedValue(ok);
			const { pi } = makePi(execImpl as any);
			return ensureAgentBrowser(pi, makeCtx()).then((result) => {
				expect(result).toBe(true);
				const call = execImpl.mock.calls[0];
				expect(call[0]).toBe("cmd");
				expect(call[1]).toEqual(["/c", "agent-browser", "--version"]);
			});
		} finally {
			Object.defineProperty(process, "platform", { value: original });
		}
	});
});