import { mkdirSync, readFileSync, realpathSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { ENV_AGENT_DIR } from "../src/config.js";
import { main } from "../src/main.js";

describe("package commands", () => {
	let tempDir: string;
	let agentDir: string;
	let projectDir: string;
	let packageDir: string;
	let originalCwd: string;
	let originalAgentDir: string | undefined;
	let originalExitCode: typeof process.exitCode;

	beforeEach(() => {
		tempDir = join(tmpdir(), `pi-package-commands-${Date.now()}-${Math.random().toString(36).slice(2)}`);
		agentDir = join(tempDir, "agent");
		projectDir = join(tempDir, "project");
		packageDir = join(tempDir, "local-package");
		mkdirSync(agentDir, { recursive: true });
		mkdirSync(projectDir, { recursive: true });
		mkdirSync(packageDir, { recursive: true });

		originalCwd = process.cwd();
		originalAgentDir = process.env[ENV_AGENT_DIR];
		originalExitCode = process.exitCode;
		process.exitCode = undefined;
		process.env[ENV_AGENT_DIR] = agentDir;
		process.chdir(projectDir);
	});

	afterEach(() => {
		process.chdir(originalCwd);
		process.exitCode = originalExitCode;
		if (originalAgentDir === undefined) {
			delete process.env[ENV_AGENT_DIR];
		} else {
			process.env[ENV_AGENT_DIR] = originalAgentDir;
		}
		rmSync(tempDir, { recursive: true, force: true });
	});

	it("should persist global relative local package paths relative to settings.json", async () => {
		const relativePkgDir = join(projectDir, "packages", "local-package");
		mkdirSync(relativePkgDir, { recursive: true });

		await main(["install", "./packages/local-package"]);

		const settingsPath = join(agentDir, "settings.json");
		const settings = JSON.parse(readFileSync(settingsPath, "utf-8")) as { packages?: string[] };
		expect(settings.packages?.length).toBe(1);
		const stored = settings.packages?.[0] ?? "";
		const resolvedFromSettings = realpathSync(join(agentDir, stored));
		expect(resolvedFromSettings).toBe(realpathSync(relativePkgDir));
	});

	it("should remove local packages using a path with a trailing slash", async () => {
		await main(["install", `${packageDir}/`]);

		const settingsPath = join(agentDir, "settings.json");
		const installedSettings = JSON.parse(readFileSync(settingsPath, "utf-8")) as { packages?: string[] };
		expect(installedSettings.packages?.length).toBe(1);

		await main(["remove", `${packageDir}/`]);

		const removedSettings = JSON.parse(readFileSync(settingsPath, "utf-8")) as { packages?: string[] };
		expect(removedSettings.packages ?? []).toHaveLength(0);
	});

	it("shows install subcommand help", async () => {
		const logSpy = vi.spyOn(console, "log").mockImplementation(() => {});
		const errorSpy = vi.spyOn(console, "error").mockImplementation(() => {});

		try {
			await expect(main(["install", "--help"])).resolves.toBeUndefined();

			const stdout = logSpy.mock.calls.map(([message]) => String(message)).join("\n");
			expect(stdout).toContain("Usage:");
			expect(stdout).toContain("pi install <source> [-l]");
			expect(errorSpy).not.toHaveBeenCalled();
			expect(process.exitCode).toBeUndefined();
		} finally {
			logSpy.mockRestore();
			errorSpy.mockRestore();
		}
	});

	it("shows a friendly error for unknown install options", async () => {
		const errorSpy = vi.spyOn(console, "error").mockImplementation(() => {});

		try {
			await expect(main(["install", "--unknown"])).resolves.toBeUndefined();

			const stderr = errorSpy.mock.calls.map(([message]) => String(message)).join("\n");
			expect(stderr).toContain('Unknown option --unknown for "install".');
			expect(stderr).toContain('Use "pi --help" or "pi install <source> [-l]".');
			expect(process.exitCode).toBe(1);
		} finally {
			errorSpy.mockRestore();
		}
	});

	it("shows a friendly error for missing install source", async () => {
		const errorSpy = vi.spyOn(console, "error").mockImplementation(() => {});

		try {
			await expect(main(["install"])).resolves.toBeUndefined();

			const stderr = errorSpy.mock.calls.map(([message]) => String(message)).join("\n");
			expect(stderr).toContain("Missing install source.");
			expect(stderr).toContain("Usage: pi install <source> [-l]");
			expect(stderr).not.toContain("at ");
			expect(process.exitCode).toBe(1);
		} finally {
			errorSpy.mockRestore();
		}
	});

	it("suggests the configured source when update input omits the npm prefix", async () => {
		const settingsPath = join(agentDir, "settings.json");
		writeFileSync(settingsPath, JSON.stringify({ packages: ["npm:pi-formatter"] }, null, 2));

		const errorSpy = vi.spyOn(console, "error").mockImplementation(() => {});
		const logSpy = vi.spyOn(console, "log").mockImplementation(() => {});

		try {
			await expect(main(["update", "pi-formatter"])).resolves.toBeUndefined();

			const stderr = errorSpy.mock.calls.map(([message]) => String(message)).join("\n");
			const stdout = logSpy.mock.calls.map(([message]) => String(message)).join("\n");
			expect(stderr).toContain("Did you mean npm:pi-formatter?");
			expect(stdout).not.toContain("Updated pi-formatter");
			expect(process.exitCode).toBe(1);

			const settings = JSON.parse(readFileSync(settingsPath, "utf-8")) as { packages?: string[] };
			expect(settings.packages).toContain("npm:pi-formatter");
		} finally {
			errorSpy.mockRestore();
			logSpy.mockRestore();
		}
	});
});
