/**
 * Unit tests for parseWorktreeList parser.
 *
 * Tests cover normal output, edge cases, malformed input, and path normalization.
 */

import { describe, it, expect } from "bun:test";
import { parseWorktreeList } from "./pi-worktree-parser";
import {
	validateCreateWorktreeInput,
	buildWorktreeAddCommand,
	validatePathDoesNotExist,
	isCurrentBranch,
} from "./pi-worktree-create";

describe("parseWorktreeList", () => {
	describe("normal output", () => {
		it("parses a single worktree entry with branch in brackets", () => {
			const rawOutput = "/home/user/project  abc1234 [main]";
			const result = parseWorktreeList(rawOutput, "/home/user/project");

			expect(result).toHaveLength(1);
			expect(result[0].path).toBe("/home/user/project");
			expect(result[0].commit).toBe("abc1234");
			expect(result[0].branch).toBe("main");
			expect(result[0].isCurrent).toBe(true);
		});

		it("parses multiple worktree entries", () => {
			const rawOutput = `/home/user/project  abc1234 [main]
/home/user/feature-x  def5678 [feature-x]`;
			const result = parseWorktreeList(rawOutput, "/home/user/project");

			expect(result).toHaveLength(2);
			expect(result[0].branch).toBe("main");
			expect(result[0].isCurrent).toBe(true);
			expect(result[1].branch).toBe("feature-x");
			expect(result[1].isCurrent).toBe(false);
		});

		it("handles detached HEAD entries", () => {
			const rawOutput = "/home/user/detached  fedcba9 HEAD";
			const result = parseWorktreeList(rawOutput, "/other/path");

			expect(result).toHaveLength(1);
			expect(result[0].branch).toBe("(detached)");
			expect(result[0].commit).toBe("fedcba9");
		});
	});

	describe("path normalization (Task 001)", () => {
		it("marks isCurrent=true when paths match with trailing slash difference", () => {
			const rawOutput = "/home/user/project  abc1234 [main]";
			const result = parseWorktreeList(rawOutput, "/home/user/project/");

			expect(result[0].isCurrent).toBe(true);
		});

		it("marks isCurrent=true when paths match with different casing in components", () => {
			const rawOutput = "/home/user/Project  abc1234 [main]";
			// On Linux, path.resolve preserves case — this tests normalization of slashes
			const result = parseWorktreeList(rawOutput, "/home/user/Project/");

			expect(result[0].isCurrent).toBe(true);
		});
	});

	describe("malformed input validation (Task 002)", () => {
		it("skips lines with fewer than 3 tokens", () => {
			const rawOutput = `/home/user/project  abc1234 [main]
/incomplete/path`;
			const result = parseWorktreeList(rawOutput, "/other");

			expect(result).toHaveLength(1);
			expect(result[0].path).toBe("/home/user/project");
		});

		it("skips lines with only 2 tokens (missing branch)", () => {
			const rawOutput = `/home/user/project  abc1234 [main]
/incomplete/path  def5678`;
			const result = parseWorktreeList(rawOutput, "/other");

			expect(result).toHaveLength(1);
		});

		it("returns empty array for completely malformed input", () => {
			const rawOutput = `just some random text`;
			const result = parseWorktreeList(rawOutput, "/any/path");

			expect(result).toHaveLength(0);
		});
	});

	describe("empty input (Task 006)", () => {
		it("returns empty array for empty string", () => {
			const result = parseWorktreeList("", "/some/path");
			expect(result).toHaveLength(0);
		});

		it("returns empty array for whitespace-only input", () => {
			const result = parseWorktreeList("   \n  \n  ", "/some/path");
			expect(result).toHaveLength(0);
		});
	});

	describe("branch names with special characters", () => {
		it("handles branch names with hyphens and slashes", () => {
			const rawOutput = "/home/user/feature  abc1234 [feature/my-branch-name]";
			const result = parseWorktreeList(rawOutput, "/other");

			expect(result).toHaveLength(1);
			expect(result[0].branch).toBe("feature/my-branch-name");
		});

		it("handles branch names with underscores", () => {
			const rawOutput = "/home/user/feature  abc1234 [issue_42_fix]";
			const result = parseWorktreeList(rawOutput, "/other");

			expect(result).toHaveLength(1);
			expect(result[0].branch).toBe("issue_42_fix");
		});
	});
});

describe("validateCreateWorktreeInput (Issue #4)", () => {
	it("returns null for valid path and branch", () => {
		const result = validateCreateWorktreeInput("/tmp/new-worktree", "feature-x");
		expect(result).toBeNull();
	});

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

	it("returns error for empty branch name", () => {
		const result = validateCreateWorktreeInput("/tmp/new-worktree", "");
		expect(result).not.toBeNull();
		if (result) expect(result.message).toContain("cannot be empty");
	});

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

	it("returns error for branch name with invalid characters (spaces)", () => {
		const result = validateCreateWorktreeInput("/tmp/new-worktree", "my bad branch");
		expect(result).not.toBeNull();
		if (result) expect(result.message).toContain("invalid characters");
	});

	it("accepts branch names with hyphens and slashes", () => {
		const result = validateCreateWorktreeInput("/tmp/new-worktree", "feature/my-branch-name");
		expect(result).toBeNull();
	});

	it("accepts branch names with underscores", () => {
		const result = validateCreateWorktreeInput("/tmp/new-worktree", "issue_42_fix");
		expect(result).toBeNull();
	});

	// Task 007: Branch name start/end validation
	it("rejects branch name starting with dash", () => {
		const result = validateCreateWorktreeInput("/tmp/x", "-feature");
		expect(result).not.toBeNull();
		if (result) expect(result.message).toContain("invalid character");
	});

	it("rejects branch name starting with slash", () => {
		const result = validateCreateWorktreeInput("/tmp/x", "/feature");
		expect(result).not.toBeNull();
	});

	it("rejects branch name starting with tilde", () => {
		const result = validateCreateWorktreeInput("/tmp/x", "~user");
		expect(result).not.toBeNull();
	});

	it("rejects branch name starting with caret", () => {
		const result = validateCreateWorktreeInput("/tmp/x", "^feature");
		expect(result).not.toBeNull();
	});

	it("rejects branch name starting with dot", () => {
		const result = validateCreateWorktreeInput("/tmp/x", ".hidden");
		expect(result).not.toBeNull();
	});

	it("rejects branch name ending with slash", () => {
		const result = validateCreateWorktreeInput("/tmp/x", "feature/");
		expect(result).not.toBeNull();
		if (result) expect(result.message).toContain("invalid character");
	});

	it("rejects branch name ending with dash", () => {
		const result = validateCreateWorktreeInput("/tmp/x", "feature-");
		expect(result).not.toBeNull();
	});

	it("rejects branch name ending with dot", () => {
		const result = validateCreateWorktreeInput("/tmp/x", "feature.");
		expect(result).not.toBeNull();
	});

	// Task 008: Dangerous character validation
	it("rejects branch name with square brackets", () => {
		const result = validateCreateWorktreeInput("/tmp/x", "feature[v1]");
		expect(result).not.toBeNull();
		if (result) expect(result.message).toContain("invalid characters");
	});

	it("rejects branch name with double quotes", () => {
		const result = validateCreateWorktreeInput("/tmp/x", 'my"branch');
		expect(result).not.toBeNull();
	});

	it("rejects branch name with single quotes", () => {
		const result = validateCreateWorktreeInput("/tmp/x", "my'branch");
		expect(result).not.toBeNull();
	});

	it("rejects branch name with backslash", () => {
		const result = validateCreateWorktreeInput("/tmp/x", "feature\\name");
		expect(result).not.toBeNull();
	});

	it("rejects branch name with asterisk", () => {
		const result = validateCreateWorktreeInput("/tmp/x", "feature*name");
		expect(result).not.toBeNull();
	});

	it("rejects branch name with question mark", () => {
		const result = validateCreateWorktreeInput("/tmp/x", "feature?name");
		expect(result).not.toBeNull();
	});
});

describe("buildWorktreeAddCommand (Issue #4)", () => {
	it("returns command with -b flag when create_branch is true", () => {
		const result = buildWorktreeAddCommand({
			path: "/tmp/new-worktree",
			branch: "feature-x",
			createBranch: true,
		});

		expect(result).toEqual([
			"worktree",
			"add",
			"-b",
			"feature-x",
			"/tmp/new-worktree",
		]);
	});

	it("returns command without -b flag when create_branch is false", () => {
		const result = buildWorktreeAddCommand({
			path: "/tmp/new-worktree",
			branch: "existing-branch",
			createBranch: false,
		});

		expect(result).toEqual([
			"worktree",
			"add",
			"existing-branch",
			"/tmp/new-worktree",
		]);
	});

	it("defaults createBranch to true when not provided", () => {
		const result = buildWorktreeAddCommand({
			path: "/tmp/new-worktree",
			branch: "new-feature",
		});

		expect(result).toContain("-b");
	});

	it("places path as the last argument", () => {
		const result = buildWorktreeAddCommand({
			path: "/tmp/new-worktree",
			branch: "feature-x",
			createBranch: true,
		});

		expect(result[result.length - 1]).toBe("/tmp/new-worktree");
	});
});

describe("validatePathDoesNotExist (Issue #4)", () => {
	it("returns null when path does not exist", () => {
		const result = validatePathDoesNotExist(
			"/tmp/nonexistent-path-abc123",
			(p) => p === "/existing/path",
		);
		expect(result).toBeNull();
	});

	it("returns error with path in message when path exists", () => {
		const existingPath = "/tmp/existing-worktree";
		const result = validatePathDoesNotExist(existingPath, (p) => p === existingPath);

		expect(result).not.toBeNull();
		if (result) expect(result.message).toContain("/tmp/existing-worktree");
		if (result) expect(result.message.toLowerCase()).toContain("already exists");
	});

	it("suggests choosing a different location", () => {
		const existingPath = "/tmp/existing-worktree";
		const result = validatePathDoesNotExist(existingPath, (p) => p === existingPath);

		expect(result).not.toBeNull();
		if (result) expect(result.suggestion?.toLowerCase()).toContain("different");
	});
});

describe("isCurrentBranch (Issue #4)", () => {
	it("returns true when branch matches current branch", () => {
		expect(isCurrentBranch("main", "main")).toBe(true);
	});

	it("returns false when branch differs from current branch", () => {
		expect(isCurrentBranch("feature-x", "main")).toBe(false);
	});

	it("handles branch names with slashes", () => {
		expect(isCurrentBranch("feature/my-branch", "main")).toBe(false);
		expect(isCurrentBranch("feature/my-branch", "feature/my-branch")).toBe(true);
	});
});

// ─── Integration Tests for git_worktree_create execute flow (Task 004) ────

describe("git_worktree_create execute flow (Issue #4)", () => {
	// Minimal mock types matching what the extension needs
	interface MockExecResult {
		exitCode: number;
		stdout: string;
		stderr: string;
	}

	interface MockContext {
		cwd: string;
	}

	interface MockPI {
		exec: (cmd: string, args: string[], opts?: { cwd: string }) => Promise<MockExecResult>;
	}

	describe("validation pipeline ordering", () => {
		it("rejects empty path before checking filesystem", async () => {
			const result = validateCreateWorktreeInput("", "feature-x");
			expect(result).not.toBeNull();
			expect(result?.message).toContain("cannot be empty");
		});

		it("rejects invalid branch name before checking filesystem", async () => {
			const result = validateCreateWorktreeInput("/tmp/x", "-bad-name");
			expect(result).not.toBeNull();
			expect(result?.message).toContain("invalid character");
		});
	});

	describe("path existence check", () => {
		it("returns error when path exists", () => {
			const existingPath = "/tmp/existing-worktree";
			const result = validatePathDoesNotExist(existingPath, (p) => p === existingPath);
			expect(result).not.toBeNull();
			expect(result?.message).toContain("/tmp/existing-worktree");
			expect(result?.suggestion).toContain("different");
		});

		it("returns null when path does not exist", () => {
			const result = validatePathDoesNotExist(
				"/tmp/nonexistent-path-abc123",
				(p) => p === "/existing/path",
			);
			expect(result).toBeNull();
		});
	});

	describe("current branch check", () => {
		it("detects when target matches current branch", () => {
			expect(isCurrentBranch("main", "main")).toBe(true);
		});

		it("allows different branch from current", () => {
			expect(isCurrentBranch("feature-x", "main")).toBe(false);
		});
	});

	describe("command building after all validations pass", () => {
		it("builds correct command with createBranch=true", () => {
			const args = buildWorktreeAddCommand({
				path: "/tmp/new-worktree",
				branch: "feature-x",
				createBranch: true,
			});
			expect(args).toEqual(["worktree", "add", "-b", "feature-x", "/tmp/new-worktree"]);
		});

		it("builds correct command with createBranch=false", () => {
			const args = buildWorktreeAddCommand({
				path: "/tmp/new-worktree",
				branch: "existing-branch",
				createBranch: false,
			});
			expect(args).toEqual(["worktree", "add", "existing-branch", "/tmp/new-worktree"]);
		});

		it("defaults createBranch to true when omitted", () => {
			const args = buildWorktreeAddCommand({
				path: "/tmp/new-worktree",
				branch: "new-feature",
			});
			expect(args).toContain("-b");
		});
	});

	describe("error formatting consistency", () => {
		it("formats input validation error with suggestion", () => {
			const result = validateCreateWorktreeInput("", "feature-x");
			expect(result).not.toBeNull();
			expect(result?.suggestion).toBeDefined();
			expect(result?.suggestion).toContain("Provide a valid path");
		});

		it("formats path exists error with suggestion", () => {
			const result = validatePathDoesNotExist("/tmp/x", () => true);
			expect(result).not.toBeNull();
			expect(result?.suggestion).toBeDefined();
			expect(result?.suggestion).toContain("different");
		});

		it("formats branch name error with suggestion", () => {
			const result = validateCreateWorktreeInput("/tmp/x", "bad name here");
			expect(result).not.toBeNull();
			expect(result?.suggestion).toBeDefined();
			expect(result?.suggestion).toContain("hyphens");
		});
	});
});