package testutil

import (
	"os"
	"os/exec"
	"path/filepath"
	"testing"
)

// CreateTempGitRepo creates a temporary directory with a git repository
func CreateTempGitRepo(t *testing.T) string {
	t.Helper()

	dir := t.TempDir()

	// Initialize git repo
	cmd := exec.Command("git", "init")
	cmd.Dir = dir
	if err := cmd.Run(); err != nil {
		t.Fatalf("failed to init git repo: %v", err)
	}

	// Configure git user for the test repo
	configName := exec.Command("git", "config", "user.name", "Test User")
	configName.Dir = dir
	if err := configName.Run(); err != nil {
		t.Fatalf("failed to configure git user.name: %v", err)
	}

	configEmail := exec.Command("git", "config", "user.email", "test@example.com")
	configEmail.Dir = dir
	if err := configEmail.Run(); err != nil {
		t.Fatalf("failed to configure git user.email: %v", err)
	}

	// Create initial commit
	readmePath := filepath.Join(dir, "README.md")
	if err := os.WriteFile(readmePath, []byte("# Test Repo\n"), 0644); err != nil {
		t.Fatalf("failed to create README: %v", err)
	}

	add := exec.Command("git", "add", "README.md")
	add.Dir = dir
	if err := add.Run(); err != nil {
		t.Fatalf("failed to git add: %v", err)
	}

	commit := exec.Command("git", "commit", "-m", "Initial commit")
	commit.Dir = dir
	if err := commit.Run(); err != nil {
		t.Fatalf("failed to git commit: %v", err)
	}

	return dir
}

// CreateTempGitRepoWithRemote creates a temporary git repo with a remote URL configured
func CreateTempGitRepoWithRemote(t *testing.T, remoteURL string) string {
	t.Helper()

	dir := CreateTempGitRepo(t)

	// Add remote
	cmd := exec.Command("git", "remote", "add", "origin", remoteURL)
	cmd.Dir = dir
	if err := cmd.Run(); err != nil {
		t.Fatalf("failed to add git remote: %v", err)
	}

	return dir
}

// CreateTempGitRepoWithBranch creates a temporary git repo on a specific branch
func CreateTempGitRepoWithBranch(t *testing.T, branch string) string {
	t.Helper()

	dir := CreateTempGitRepo(t)

	// Create and checkout branch
	cmd := exec.Command("git", "checkout", "-b", branch)
	cmd.Dir = dir
	if err := cmd.Run(); err != nil {
		t.Fatalf("failed to create branch: %v", err)
	}

	return dir
}

// CreateNestedRepoStructure creates a directory structure with nested git repos
// Returns the root directory path
func CreateNestedRepoStructure(t *testing.T) (rootDir string, nestedDirs []string) {
	t.Helper()

	rootDir = CreateTempGitRepo(t)

	// Create nested repos
	nested1 := filepath.Join(rootDir, "project1")
	if err := os.MkdirAll(nested1, 0755); err != nil {
		t.Fatalf("failed to create nested dir: %v", err)
	}
	initGit(t, nested1)

	nested2 := filepath.Join(rootDir, "subdir", "project2")
	if err := os.MkdirAll(nested2, 0755); err != nil {
		t.Fatalf("failed to create nested dir: %v", err)
	}
	initGit(t, nested2)

	nested3 := filepath.Join(rootDir, "subdir", "deep", "project3")
	if err := os.MkdirAll(nested3, 0755); err != nil {
		t.Fatalf("failed to create nested dir: %v", err)
	}
	initGit(t, nested3)

	return rootDir, []string{nested1, nested2, nested3}
}

// initGit initializes a git repo in the given directory
func initGit(t *testing.T, dir string) {
	t.Helper()

	cmd := exec.Command("git", "init")
	cmd.Dir = dir
	if err := cmd.Run(); err != nil {
		t.Fatalf("failed to init git repo: %v", err)
	}

	// Configure git user
	configName := exec.Command("git", "config", "user.name", "Test User")
	configName.Dir = dir
	if err := configName.Run(); err != nil {
		t.Fatalf("failed to configure git user.name: %v", err)
	}

	configEmail := exec.Command("git", "config", "user.email", "test@example.com")
	configEmail.Dir = dir
	if err := configEmail.Run(); err != nil {
		t.Fatalf("failed to configure git user.email: %v", err)
	}

	// Create initial commit
	readmePath := filepath.Join(dir, "README.md")
	if err := os.WriteFile(readmePath, []byte("# Test\n"), 0644); err != nil {
		t.Fatalf("failed to create README: %v", err)
	}

	add := exec.Command("git", "add", "README.md")
	add.Dir = dir
	if err := add.Run(); err != nil {
		t.Fatalf("failed to git add: %v", err)
	}

	commit := exec.Command("git", "commit", "-m", "Initial commit")
	commit.Dir = dir
	if err := commit.Run(); err != nil {
		t.Fatalf("failed to git commit: %v", err)
	}
}