package cmd

import (
	"fmt"
	"os"
	"path/filepath"
	"time"

	"git.membo.co.uk/dtomlinson/gitlocal/internal/config"
	"git.membo.co.uk/dtomlinson/gitlocal/internal/git"
	"git.membo.co.uk/dtomlinson/gitlocal/internal/scanner"
	"github.com/spf13/cobra"
)

var (
	recursive bool
	dryRun    bool
)

var convertCmd = &cobra.Command{
	Use:   "convert [path]",
	Short: "Convert .git to .gitlocal",
	Long: `Convert renames .git to .gitlocal in the specified directory.
If no path is provided, uses the current directory.

Use --recursive to scan and convert all nested git repositories.`,
	Args: cobra.MaximumNArgs(1),
	RunE: runConvert,
}

func init() {
	convertCmd.Flags().BoolVarP(&recursive, "recursive", "r", false, "Recursively convert all nested repos")
	convertCmd.Flags().BoolVar(&dryRun, "dry-run", false, "Show what would be converted without making changes")
}

func runConvert(cmd *cobra.Command, args []string) error {
	// Determine target path
	targetPath := "."
	if len(args) > 0 {
		targetPath = args[0]
	}

	// Get absolute path
	absPath, err := filepath.Abs(targetPath)
	if err != nil {
		return fmt.Errorf("failed to get absolute path: %w", err)
	}

	// Load config
	cfg, err := config.Load()
	if err != nil {
		return fmt.Errorf("failed to load config: %w", err)
	}

	if recursive {
		return convertRecursive(absPath, cfg)
	}

	return convertSingle(absPath, cfg)
}

func convertSingle(path string, cfg *config.Config) error {
	// Check if already converted
	if git.IsGitLocalRepo(path) {
		// Check if already in config
		if existingRepo := cfg.FindRepo(path); existingRepo != nil {
			fmt.Printf("⊘ Already converted and tracked: %s\n", path)
			return nil
		}

		// Add to config
		gitLocalPath := filepath.Join(path, git.GitLocalDir)
		remoteURL := git.GetRemoteURL(gitLocalPath)
		branch := git.GetCurrentBranch(gitLocalPath)

		cfg.AddRepo(config.Repo{
			Path:           path,
			ConvertedAt:    time.Now(),
			OriginalRemote: remoteURL,
			OriginalBranch: branch,
		})

		if err := cfg.Save(); err != nil {
			return fmt.Errorf("failed to save config: %w", err)
		}

		fmt.Printf("✓ Registered already-converted repo: %s\n", path)
		if remoteURL != "" {
			fmt.Printf("  Remote: %s\n", remoteURL)
		}
		if branch != "" {
			fmt.Printf("  Branch: %s\n", branch)
		}
		return nil
	}

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

	if dryRun {
		fmt.Printf("[DRY RUN] Would convert: %s\n", path)
		return nil
	}

	// Get git info before converting
	gitPath := filepath.Join(path, git.GitDir)
	remoteURL := git.GetRemoteURL(gitPath)
	branch := git.GetCurrentBranch(gitPath)

	// Convert
	if err := git.Convert(path); err != nil {
		return err
	}

	// Update config
	cfg.AddRepo(config.Repo{
		Path:           path,
		ConvertedAt:    time.Now(),
		OriginalRemote: remoteURL,
		OriginalBranch: branch,
	})

	if err := cfg.Save(); err != nil {
		return fmt.Errorf("failed to save config: %w", err)
	}

	fmt.Printf("✓ Converted: %s\n", path)
	if remoteURL != "" {
		fmt.Printf("  Remote: %s\n", remoteURL)
	}
	if branch != "" {
		fmt.Printf("  Branch: %s\n", branch)
	}

	return nil
}

func convertRecursive(rootPath string, cfg *config.Config) error {
	repos, err := scanner.FindNestedGitRepos(rootPath)
	if err != nil {
		return fmt.Errorf("failed to scan for nested repos: %w", err)
	}

	if len(repos) == 0 {
		fmt.Println("No nested git repositories found")
		return nil
	}

	fmt.Printf("Found %d nested git repositories\n\n", len(repos))

	converted := 0
	registered := 0
	for _, repoPath := range repos {
		if git.IsGitLocalRepo(repoPath) {
			// Check if already in config
			if existingRepo := cfg.FindRepo(repoPath); existingRepo != nil {
				fmt.Printf("⊘ Skipped (already converted and tracked): %s\n", repoPath)
				continue
			}

			// Register already-converted repo
			gitLocalPath := filepath.Join(repoPath, git.GitLocalDir)
			remoteURL := git.GetRemoteURL(gitLocalPath)
			branch := git.GetCurrentBranch(gitLocalPath)

			cfg.AddRepo(config.Repo{
				Path:           repoPath,
				ConvertedAt:    time.Now(),
				OriginalRemote: remoteURL,
				OriginalBranch: branch,
			})

			fmt.Printf("✓ Registered already-converted: %s\n", repoPath)
			registered++
			continue
		}

		if dryRun {
			fmt.Printf("[DRY RUN] Would convert: %s\n", repoPath)
			continue
		}

		// Get git info before converting
		gitPath := filepath.Join(repoPath, git.GitDir)
		remoteURL := git.GetRemoteURL(gitPath)
		branch := git.GetCurrentBranch(gitPath)

		// Convert
		if err := git.Convert(repoPath); err != nil {
			fmt.Fprintf(os.Stderr, "✗ Failed to convert %s: %v\n", repoPath, err)
			continue
		}

		// Update config
		cfg.AddRepo(config.Repo{
			Path:           repoPath,
			ConvertedAt:    time.Now(),
			OriginalRemote: remoteURL,
			OriginalBranch: branch,
		})

		fmt.Printf("✓ Converted: %s\n", repoPath)
		converted++
	}

	if !dryRun && (converted > 0 || registered > 0) {
		if err := cfg.Save(); err != nil {
			return fmt.Errorf("failed to save config: %w", err)
		}
		fmt.Printf("\nSuccessfully converted %d repositories", converted)
		if registered > 0 {
			fmt.Printf(", registered %d already-converted", registered)
		}
		fmt.Println()
	}

	return nil
}