package cli

import (
	"context"
	"fmt"
	"os"
	"text/tabwriter"

	"github.com/spf13/cobra"
)

func NewBucketCmd() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "bucket",
		Short: "Manage storage buckets",
		Long:  "Create, list, and manage your storage buckets",
	}

	cmd.AddCommand(newBucketCreateCmd())
	cmd.AddCommand(newBucketListCmd())
	cmd.AddCommand(newBucketDeleteCmd())
	cmd.AddCommand(newBucketInfoCmd())

	return cmd
}

func newBucketCreateCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "create <bucket-name>",
		Short: "Create a new bucket",
		Args:  cobra.ExactArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			config, err := LoadConfig()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			if !config.IsAuthenticated() {
				return fmt.Errorf("not logged in. Use 'tcman account login' or 'tcman account create'")
			}

			bucketName := args[0]
			client := NewClient(config.ServerURL, config.AccessToken)
			ctx := context.Background()

			bucket, err := client.CreateBucket(ctx, bucketName)
			if err != nil {
				return fmt.Errorf("failed to create bucket: %w", err)
			}

			fmt.Printf("Bucket '%s' created successfully!\n", bucket.Name)
			fmt.Printf("ID: %d\n", bucket.ID)
			fmt.Printf("Storage Used: %d bytes\n", bucket.StorageUsedBytes)
			fmt.Printf("Created: %s\n", bucket.CreatedAt.Format("2006-01-02 15:04:05"))

			return nil
		},
	}
}

func newBucketListCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "list",
		Short: "List all buckets",
		RunE: func(cmd *cobra.Command, args []string) error {
			config, err := LoadConfig()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			if !config.IsAuthenticated() {
				return fmt.Errorf("not logged in. Use 'tcman account login' or 'tcman account create'")
			}

			client := NewClient(config.ServerURL, config.AccessToken)
			ctx := context.Background()

			buckets, err := client.ListBuckets(ctx)
			if err != nil {
				return fmt.Errorf("failed to list buckets: %w", err)
			}

			if len(buckets) == 0 {
				fmt.Printf("No buckets found.\n")
				return nil
			}

			w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
			fmt.Fprintln(w, "Name\tStorage Used\tCreated")
			fmt.Fprintln(w, "----\t------------\t-------")

			for _, bucket := range buckets {
				storageStr := formatBytes(bucket.StorageUsedBytes)
				fmt.Fprintf(w, "%s\t%s\t%s\n",
					bucket.Name,
					storageStr,
					bucket.CreatedAt.Format("2006-01-02 15:04"),
				)
			}
			w.Flush()

			return nil
		},
	}
}

func newBucketInfoCmd() *cobra.Command {
	return &cobra.Command{
		Use:   "info <bucket-name>",
		Short: "Show bucket information",
		Args:  cobra.ExactArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			config, err := LoadConfig()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			if !config.IsAuthenticated() {
				return fmt.Errorf("not logged in. Use 'tcman account login' or 'tcman account create'")
			}

			bucketName := args[0]
			client := NewClient(config.ServerURL, config.AccessToken)
			ctx := context.Background()

			bucket, err := client.GetBucket(ctx, bucketName)
			if err != nil {
				return fmt.Errorf("failed to get bucket info: %w", err)
			}

			fmt.Printf("Bucket Information:\n")
			fmt.Printf("  Name: %s\n", bucket.Name)
			fmt.Printf("  ID: %d\n", bucket.ID)
			fmt.Printf("  Storage Used: %s\n", formatBytes(bucket.StorageUsedBytes))
			fmt.Printf("  Created: %s\n", bucket.CreatedAt.Format("2006-01-02 15:04:05"))

			objects, err := client.ListObjects(ctx, bucketName)
			if err != nil {
				fmt.Printf("  Objects: Error loading (%v)\n", err)
			} else {
				fmt.Printf("  Objects: %d\n", len(objects))
			}

			return nil
		},
	}
}

func newBucketDeleteCmd() *cobra.Command {
	var force bool

	cmd := &cobra.Command{
		Use:   "delete <bucket-name>",
		Short: "Delete a bucket",
		Args:  cobra.ExactArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			config, err := LoadConfig()
			if err != nil {
				return fmt.Errorf("failed to load config: %w", err)
			}

			if !config.IsAuthenticated() {
				return fmt.Errorf("not logged in. Use 'tcman account login' or 'tcman account create'")
			}

			bucketName := args[0]
			client := NewClient(config.ServerURL, config.AccessToken)
			ctx := context.Background()

			if !force {
				objects, err := client.ListObjects(ctx, bucketName)
				if err != nil {
					return fmt.Errorf("failed to check bucket contents: %w", err)
				}

				if len(objects) > 0 {
					return fmt.Errorf("bucket '%s' contains %d objects. Use --force to delete anyway", bucketName, len(objects))
				}

				fmt.Printf("Are you sure you want to delete bucket '%s'? (y/N): ", bucketName)
				var response string
				fmt.Scanln(&response)
				if response != "y" && response != "yes" && response != "Y" && response != "YES" {
					fmt.Printf("Cancelled.\n")
					return nil
				}
			}

			err = client.DeleteBucket(ctx, bucketName)
			if err != nil {
				return fmt.Errorf("failed to delete bucket: %w", err)
			}

			fmt.Printf("Bucket '%s' deleted successfully.\n", bucketName)
			return nil
		},
	}

	cmd.Flags().BoolVar(&force, "force", false, "Force deletion without confirmation")
	return cmd
}

func formatBytes(bytes int64) string {
	if bytes == 0 {
		return "0 B"
	}

	const unit = 1024
	if bytes < unit {
		return fmt.Sprintf("%d B", bytes)
	}

	div, exp := int64(unit), 0
	for n := bytes / unit; n >= unit; n /= unit {
		div *= unit
		exp++
	}

	units := []string{"KB", "MB", "GB", "TB"}
	return fmt.Sprintf("%.1f %s", float64(bytes)/float64(div), units[exp])
}