/**
 * Unit tests for git_worktree_remove validation and command-building functions.
 *
 * Tests cover input validation, main repo detection, uncommitted changes check,
 * and command building for `git worktree remove`.
 */

import { describe, it, expect } from "bun:test";
import {
	validateRemoveWorktreeInput,
	isMainRepository,
	hasUncommittedChanges,
	buildWorktreeRemoveCommand,
} from "./pi-worktree-remove";

// ─── validateRemoveWorktreeInput ──────────────────────────────────────

describe("validateRemoveWorktreeInput (Issue #5)", () => {
	it("returns null for valid path", () => {
		const result = validateRemoveWorktreeInput("/tmp/worktrees/feature-x");
		expect(result).toBeNull();
	});

	it("returns error for empty path", () => {
		const result = validateRemoveWorktreeInput("");
		expect(result).not.toBeNull();
		if (result) expect(result.message).toContain("cannot be empty");
	});

	it("returns error for whitespace-only path", () => {
		const result = validateRemoveWorktreeInput("   ");
		expect(result).not.toBeNull();
	});

	it("includes suggestion in error message", () => {
		const result = validateRemoveWorktreeInput("");
		expect(result).not.toBeNull();
		if (result) expect(result.suggestion).toBeDefined();
	});
});

// ─── isMainRepository ────────────────────────────────────────────────

describe("isMainRepository (Issue #5)", () => {
	it("returns true when target path matches main repo root", () => {
		const result = isMainRepository("/home/user/project", "/home/user/project");
		expect(result).toBe(true);
	});

	it("returns false when target path differs from main repo root", () => {
		const result = isMainRepository("/tmp/feature-x", "/home/user/project");
		expect(result).toBe(false);
	});

	it("handles trailing slash differences in paths", () => {
		const result = isMainRepository("/home/user/project/", "/home/user/project");
		expect(result).toBe(true);
	});

	it("returns false for subdirectory of main repo (worktree outside)", () => {
		const result = isMainRepository("../worktrees/feature-x", "/home/user/project");
		expect(result).toBe(false);
	});
});

// ─── hasUncommittedChanges ──────────────────────────────────────────

describe("hasUncommittedChanges (Issue #5)", () => {
	it("returns true when git status output has content", () => {
		const result = hasUncommittedChanges(" modified: file.txt\n");
		expect(result).toBe(true);
	});

	it("returns false when git status output is empty", () => {
		const result = hasUncommittedChanges("");
		expect(result).toBe(false);
	});

	it("returns false when git status output is whitespace only", () => {
		const result = hasUncommittedChanges("   \n  ");
		expect(result).toBe(false);
	});

	it("detects staged changes", () => {
		const result = hasUncommittedChanges("new file:   added.txt\n");
		expect(result).toBe(true);
	});

	it("detects untracked files in status output", () => {
		const result = hasUncommittedChanges("?? untracked-file.txt\n");
		expect(result).toBe(true);
	});
});

// ─── buildWorktreeRemoveCommand ──────────────────────────────────────

describe("buildWorktreeRemoveCommand (Issue #5)", () => {
	it("returns basic remove command without flags", () => {
		const result = buildWorktreeRemoveCommand("/tmp/worktrees/feature-x");
		expect(result).toEqual(["worktree", "remove", "/tmp/worktrees/feature-x"]);
	});

	it("includes --force flag when force is true", () => {
		const result = buildWorktreeRemoveCommand("/tmp/worktrees/feature-x", { force: true });
		expect(result).toContain("--force");
	});

	it("places path as the last argument", () => {
		const result = buildWorktreeRemoveCommand("/tmp/worktrees/feature-x", { force: true });
		expect(result[result.length - 1]).toBe("/tmp/worktrees/feature-x");
	});

	it("builds correct command with force flag", () => {
		const result = buildWorktreeRemoveCommand("/tmp/worktrees/feature-x", { force: true });
		expect(result).toEqual(["worktree", "remove", "--force", "/tmp/worktrees/feature-x"]);
	});
});