package cmd

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

	"git.gostacks.org/iwasforcedtobehere/fastestmirror/internal/config"
	"git.gostacks.org/iwasforcedtobehere/fastestmirror/internal/distro"
	"git.gostacks.org/iwasforcedtobehere/fastestmirror/internal/mirror"
	"github.com/fatih/color"
	"github.com/spf13/cobra"
)

var applyCmd = &cobra.Command{
	Use:   "apply",
	Short: "Apply the fastest mirror to your system configuration",
	Long: `Apply the fastest mirror found to your system's package manager configuration.

This will:
  • Backup your current configuration (because we're not savages)
  • Update your package manager to use the fastest mirror
  • Test the new configuration

WARNING: This modifies system files and requires root privileges.
Don't blame us if you break something - you've been warned! 🔥`,
	RunE: runApply,
}

var (
	force      bool
	dryRun     bool
	backupPath string
)

func runApply(cmd *cobra.Command, args []string) error {
	// Check if running as root
	if os.Geteuid() != 0 && !dryRun {
		binaryName := "fastestmirror"
		if len(os.Args) > 0 {
			binaryName = filepath.Base(os.Args[0])
		}
		return fmt.Errorf("this command requires root privileges. Try: sudo %s apply", binaryName)
	}

	// Detect distribution
	fmt.Println("🔍 Detecting distribution...")
	distroInfo, err := distro.DetectDistribution()
	if err != nil {
		return fmt.Errorf("could not detect distribution: %w", err)
	}

	if !distroInfo.IsSupported() {
		return fmt.Errorf("distribution %s is not supported yet", distroInfo.ID)
	}

	configFile := distroInfo.GetConfigFile()
	if configFile == "" {
		return fmt.Errorf("no configuration file defined for %s", distroInfo.Family)
	}

	if dryRun {
		fmt.Printf("🧪 DRY RUN: Would modify %s\n", configFile)
		fmt.Println("🧪 DRY RUN: Would backup existing configuration")
		fmt.Println("🧪 DRY RUN: Would test fastest mirror and apply changes")
		return nil
	}

	// Create configuration manager
	configManager := config.NewConfigManager(distroInfo)

	// First, find the fastest mirror
	fmt.Printf("🔍 Finding fastest mirror for %s...\n", color.YellowString(distroInfo.Family))

	mirrorList := mirror.NewMirrorList(distroInfo.Family)

	ctx, cancel := context.WithTimeout(context.Background(), 120*time.Second)
	defer cancel()

	err = mirrorList.LoadMirrors(ctx, distroInfo.Family)
	if err != nil {
		return fmt.Errorf("failed to load mirrors: %w", err)
	}

	err = mirrorList.TestMirrors(ctx, 10*time.Second)
	if err != nil {
		return fmt.Errorf("failed to test mirrors: %w", err)
	}

	bestMirror := mirrorList.GetBest()
	if bestMirror == nil {
		return fmt.Errorf("no working mirrors found - your connection might be fucked")
	}

	fmt.Printf("🏆 Best mirror found: %s\n", color.GreenString(bestMirror.URL))
	fmt.Printf("⚡ Speed: %.1f MB/s, Latency: %dms\n", bestMirror.Speed, bestMirror.Latency.Milliseconds())

	// Ask for confirmation unless forced
	if !force {
		fmt.Printf("\n⚠️  This will modify %s\n", color.YellowString(configFile))
		fmt.Print("Do you want to continue? [y/N]: ")

		var response string
		fmt.Scanln(&response)

		if strings.ToLower(response) != "y" && strings.ToLower(response) != "yes" {
			fmt.Println("Operation cancelled.")
			return nil
		}
	}

	// Create backup
	fmt.Println("💾 Creating backup...")
	backupPath, err := configManager.BackupConfig()
	if err != nil {
		return fmt.Errorf("failed to create backup: %w", err)
	}
	fmt.Printf("✅ Backup created: %s\n", color.GreenString(backupPath))

	// Apply the fastest mirror
	fmt.Println("🔧 Applying fastest mirror configuration...")
	err = configManager.ApplyMirror(bestMirror.URL)
	if err != nil {
		// Try to restore backup on failure
		fmt.Printf("❌ Failed to apply configuration: %v\n", err)
		fmt.Println("� Attempting to restore backup...")

		if restoreErr := configManager.RestoreBackup(backupPath); restoreErr != nil {
			return fmt.Errorf("configuration failed AND backup restore failed: %v (original error: %v)", restoreErr, err)
		}

		fmt.Println("✅ Backup restored successfully")
		return fmt.Errorf("configuration application failed, backup restored: %w", err)
	}

	fmt.Printf("🎉 Successfully applied fastest mirror!\n")
	fmt.Printf("🔗 New mirror: %s\n", color.GreenString(bestMirror.URL))
	fmt.Println()
	fmt.Printf("💡 Don't forget to run your package manager's update command:\n")

	switch distroInfo.Family {
	case "debian":
		fmt.Printf("   %s\n", color.CyanString("sudo apt update"))
	case "arch":
		fmt.Printf("   %s\n", color.CyanString("sudo pacman -Sy"))
	case "fedora":
		fmt.Printf("   %s\n", color.CyanString("sudo dnf clean all && sudo dnf makecache"))
	}

	return nil
}

func init() {
	rootCmd.AddCommand(applyCmd)

	applyCmd.Flags().BoolVarP(&force, "force", "f", false, "Force application without confirmation")
	applyCmd.Flags().BoolVarP(&dryRun, "dry-run", "d", false, "Show what would be done without making changes")
	applyCmd.Flags().StringVarP(&backupPath, "backup", "b", "", "Custom backup file path")
}