package git

import (
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
)

const (
	GitDir      = ".git"
	GitLocalDir = ".gitlocal"
)

// IsGitRepo checks if the path contains a .git directory
func IsGitRepo(path string) bool {
	gitPath := filepath.Join(path, GitDir)
	info, err := os.Stat(gitPath)
	if err != nil {
		return false
	}
	return info.IsDir()
}

// IsGitLocalRepo checks if the path contains a .gitlocal directory
func IsGitLocalRepo(path string) bool {
	gitLocalPath := filepath.Join(path, GitLocalDir)
	info, err := os.Stat(gitLocalPath)
	if err != nil {
		return false
	}
	return info.IsDir()
}

// GetRemoteURL returns the remote URL for the git repo
func GetRemoteURL(gitDir string) string {
	cmd := exec.Command("git", "--git-dir", gitDir, "remote", "get-url", "origin")
	output, err := cmd.Output()
	if err != nil {
		return ""
	}
	return strings.TrimSpace(string(output))
}

// GetCurrentBranch returns the current branch for the git repo
func GetCurrentBranch(gitDir string) string {
	cmd := exec.Command("git", "--git-dir", gitDir, "branch", "--show-current")
	output, err := cmd.Output()
	if err != nil {
		return ""
	}
	return strings.TrimSpace(string(output))
}

// Convert renames .git to .gitlocal
func Convert(path string) error {
	gitPath := filepath.Join(path, GitDir)
	gitLocalPath := filepath.Join(path, GitLocalDir)

	if !IsGitRepo(path) {
		return fmt.Errorf("no .git directory found at %s", path)
	}

	if IsGitLocalRepo(path) {
		return fmt.Errorf(".gitlocal already exists at %s", path)
	}

	if err := os.Rename(gitPath, gitLocalPath); err != nil {
		return fmt.Errorf("failed to rename .git to .gitlocal: %w", err)
	}

	return nil
}

// Revert renames .gitlocal back to .git
func Revert(path string) error {
	gitPath := filepath.Join(path, GitDir)
	gitLocalPath := filepath.Join(path, GitLocalDir)

	if !IsGitLocalRepo(path) {
		return fmt.Errorf("no .gitlocal directory found at %s", path)
	}

	if IsGitRepo(path) {
		return fmt.Errorf(".git already exists at %s", path)
	}

	if err := os.Rename(gitLocalPath, gitPath); err != nil {
		return fmt.Errorf("failed to rename .gitlocal to .git: %w", err)
	}

	return nil
}