/**
 * @file test_git_cli.cpp
 * @brief Unit tests for Git CLI wrapper functionality
 */

#include "wizardmerge/git/git_cli.h"
#include <filesystem>
#include <fstream>
#include <gtest/gtest.h>

using namespace wizardmerge::git;
namespace fs = std::filesystem;

class GitCLITest : public ::testing::Test {
protected:
  std::string test_dir;

  void SetUp() override {
    // Create temporary test directory using std::filesystem
    std::filesystem::path temp_base = std::filesystem::temp_directory_path();
    test_dir =
        (temp_base / ("wizardmerge_git_test_" + std::to_string(time(nullptr))))
            .string();
    fs::create_directories(test_dir);
  }

  void TearDown() override {
    // Clean up test directory
    if (fs::exists(test_dir)) {
      fs::remove_all(test_dir);
    }
  }

  // Helper to initialize a git repo
  void init_repo(const std::string &path) {
    system(("git init \"" + path + "\" 2>&1 > /dev/null").c_str());
    system(("git -C \"" + path + "\" config user.name \"Test User\"").c_str());
    system(("git -C \"" + path + "\" config user.email \"test@example.com\"")
               .c_str());
  }

  // Helper to create a file
  void create_file(const std::string &path, const std::string &content) {
    std::ofstream file(path);
    file << content;
    file.close();
  }
};

/**
 * Test Git availability check
 */
TEST_F(GitCLITest, GitAvailability) {
  // Git should be available in CI environment
  EXPECT_TRUE(is_git_available());
}

/**
 * Test branch existence check
 */
TEST_F(GitCLITest, BranchExists) {
  std::string repo_path = test_dir + "/test_repo";
  init_repo(repo_path);

  // Create initial commit (required for branch operations)
  create_file(repo_path + "/test.txt", "initial content");
  system(
      ("git -C \"" + repo_path + "\" add test.txt 2>&1 > /dev/null").c_str());
  system(("git -C \"" + repo_path +
          "\" commit -m \"Initial commit\" 2>&1 > /dev/null")
             .c_str());

  // Default branch should exist (main or master)
  auto current_branch = get_current_branch(repo_path);
  ASSERT_TRUE(current_branch.has_value());
  EXPECT_TRUE(branch_exists(repo_path, current_branch.value()));

  // Non-existent branch should not exist
  EXPECT_FALSE(branch_exists(repo_path, "nonexistent-branch"));
}

/**
 * Test getting current branch
 */
TEST_F(GitCLITest, GetCurrentBranch) {
  std::string repo_path = test_dir + "/test_repo";
  init_repo(repo_path);

  // Create initial commit
  create_file(repo_path + "/test.txt", "initial content");
  system(
      ("git -C \"" + repo_path + "\" add test.txt 2>&1 > /dev/null").c_str());
  system(("git -C \"" + repo_path +
          "\" commit -m \"Initial commit\" 2>&1 > /dev/null")
             .c_str());

  auto branch = get_current_branch(repo_path);
  ASSERT_TRUE(branch.has_value());
  // Should be either "main" or "master" depending on Git version
  EXPECT_TRUE(branch.value() == "main" || branch.value() == "master");
}

/**
 * Test creating a new branch
 */
TEST_F(GitCLITest, CreateBranch) {
  std::string repo_path = test_dir + "/test_repo";
  init_repo(repo_path);

  // Create initial commit
  create_file(repo_path + "/test.txt", "initial content");
  system(
      ("git -C \"" + repo_path + "\" add test.txt 2>&1 > /dev/null").c_str());
  system(("git -C \"" + repo_path +
          "\" commit -m \"Initial commit\" 2>&1 > /dev/null")
             .c_str());

  // Create new branch
  GitResult result = create_branch(repo_path, "test-branch");
  EXPECT_TRUE(result.success) << "Error: " << result.error;

  // Verify we're on the new branch
  auto current_branch = get_current_branch(repo_path);
  ASSERT_TRUE(current_branch.has_value());
  EXPECT_EQ(current_branch.value(), "test-branch");

  // Verify branch exists
  EXPECT_TRUE(branch_exists(repo_path, "test-branch"));
}

/**
 * Test adding files
 */
TEST_F(GitCLITest, AddFiles) {
  std::string repo_path = test_dir + "/test_repo";
  init_repo(repo_path);

  // Create test files
  create_file(repo_path + "/file1.txt", "content1");
  create_file(repo_path + "/file2.txt", "content2");

  // Add files
  GitResult result = add_files(repo_path, {"file1.txt", "file2.txt"});
  EXPECT_TRUE(result.success) << "Error: " << result.error;
}

/**
 * Test committing changes
 */
TEST_F(GitCLITest, Commit) {
  std::string repo_path = test_dir + "/test_repo";
  init_repo(repo_path);

  // Create and add a file
  create_file(repo_path + "/test.txt", "content");
  add_files(repo_path, {"test.txt"});

  // Commit
  GitConfig config;
  config.user_name = "Test User";
  config.user_email = "test@example.com";

  GitResult result = commit(repo_path, "Test commit", config);
  EXPECT_TRUE(result.success) << "Error: " << result.error;
}

/**
 * Test repository status
 */
TEST_F(GitCLITest, Status) {
  std::string repo_path = test_dir + "/test_repo";
  init_repo(repo_path);

  GitResult result = status(repo_path);
  EXPECT_TRUE(result.success);
  EXPECT_FALSE(result.output.empty());
}

/**
 * Test checkout branch
 */
TEST_F(GitCLITest, CheckoutBranch) {
  std::string repo_path = test_dir + "/test_repo";
  init_repo(repo_path);

  // Create initial commit
  create_file(repo_path + "/test.txt", "initial content");
  system(
      ("git -C \"" + repo_path + "\" add test.txt 2>&1 > /dev/null").c_str());
  system(("git -C \"" + repo_path +
          "\" commit -m \"Initial commit\" 2>&1 > /dev/null")
             .c_str());

  // Create and switch to new branch
  create_branch(repo_path, "test-branch");

  // Get original branch
  auto original_branch = get_current_branch(repo_path);
  system(("git -C \"" + repo_path + "\" checkout " + original_branch.value() +
          " 2>&1 > /dev/null")
             .c_str());

  // Checkout the test branch
  GitResult result = checkout_branch(repo_path, "test-branch");
  EXPECT_TRUE(result.success) << "Error: " << result.error;

  // Verify we're on test-branch
  auto current_branch = get_current_branch(repo_path);
  ASSERT_TRUE(current_branch.has_value());
  EXPECT_EQ(current_branch.value(), "test-branch");
}

/**
 * Test empty file list
 */
TEST_F(GitCLITest, AddEmptyFileList) {
  std::string repo_path = test_dir + "/test_repo";
  init_repo(repo_path);

  // Add empty file list should succeed without error
  GitResult result = add_files(repo_path, {});
  EXPECT_TRUE(result.success);
}