import { execSync } from "node:child_process";
import { existsSync, mkdirSync, readFileSync, rmSync, statSync, writeFileSync } from "node:fs";
import os from "node:os";
import { join } from "node:path";
import { afterEach, beforeEach, describe, expect, it } from "vitest";
import { installPostCheckoutHook } from "../../../../src/infrastructure/hooks/install-post-checkout.js";
import { TFF_HOOK_MARKER } from "../../../../src/infrastructure/hooks/post-checkout-template.js";

describe("installPostCheckoutHook", () => {
	let tmpDir: string;

	beforeEach(() => {
		tmpDir = join(
			os.tmpdir(),
			`tff-hook-install-${Date.now()}-${Math.random().toString(36).slice(2)}`,
		);
		mkdirSync(tmpDir, { recursive: true });
		const env = Object.fromEntries(
			Object.entries(process.env).filter(([k]) => !k.startsWith("GIT_")),
		);
		execSync("git init", { cwd: tmpDir, stdio: "ignore", env });
	});

	afterEach(() => {
		rmSync(tmpDir, { recursive: true, force: true });
	});

	it("installs hook with executable permissions", () => {
		installPostCheckoutHook(tmpDir);
		const hookPath = join(tmpDir, ".git", "hooks", "post-checkout");
		expect(existsSync(hookPath)).toBe(true);
		const mode = statSync(hookPath).mode;
		expect(mode & 0o111).toBeTruthy();
	});

	it("contains tff marker", () => {
		installPostCheckoutHook(tmpDir);
		const hookPath = join(tmpDir, ".git", "hooks", "post-checkout");
		expect(readFileSync(hookPath, "utf8")).toContain(TFF_HOOK_MARKER);
	});

	it("renames existing non-tff hook to .pre-tff", () => {
		const hooksDir = join(tmpDir, ".git", "hooks");
		mkdirSync(hooksDir, { recursive: true });
		writeFileSync(join(hooksDir, "post-checkout"), "#!/bin/sh\necho existing", { mode: 0o755 });

		installPostCheckoutHook(tmpDir);

		expect(existsSync(join(hooksDir, "post-checkout.pre-tff"))).toBe(true);
		const preTff = readFileSync(join(hooksDir, "post-checkout.pre-tff"), "utf8");
		expect(preTff).toContain("echo existing");
		expect(readFileSync(join(hooksDir, "post-checkout"), "utf8")).toContain(TFF_HOOK_MARKER);
	});

	it("overwrites existing tff hook without creating .pre-tff", () => {
		const hooksDir = join(tmpDir, ".git", "hooks");
		mkdirSync(hooksDir, { recursive: true });
		writeFileSync(join(hooksDir, "post-checkout"), `#!/bin/sh\n${TFF_HOOK_MARKER}\nold version`, {
			mode: 0o755,
		});

		installPostCheckoutHook(tmpDir);

		expect(existsSync(join(hooksDir, "post-checkout.pre-tff"))).toBe(false);
		expect(readFileSync(join(hooksDir, "post-checkout"), "utf8")).toContain(TFF_HOOK_MARKER);
	});
});