package cli

import (
	"context"
	"fmt"
	"os"

	"git.eeqj.de/sneak/vaultik/internal/log"
	"git.eeqj.de/sneak/vaultik/internal/vaultik"
	"github.com/spf13/cobra"
	"go.uber.org/fx"
)

// NewSnapshotCommand creates the snapshot command and subcommands
func NewSnapshotCommand() *cobra.Command {
	cmd := &cobra.Command{
		Use:   "snapshot",
		Short: "Snapshot management commands",
		Long:  "Commands for creating, listing, and managing snapshots",
	}

	// Add subcommands
	cmd.AddCommand(newSnapshotCreateCommand())
	cmd.AddCommand(newSnapshotListCommand())
	cmd.AddCommand(newSnapshotPurgeCommand())
	cmd.AddCommand(newSnapshotVerifyCommand())

	return cmd
}

// newSnapshotCreateCommand creates the 'snapshot create' subcommand
func newSnapshotCreateCommand() *cobra.Command {
	opts := &vaultik.SnapshotCreateOptions{}

	cmd := &cobra.Command{
		Use:   "create",
		Short: "Create a new snapshot",
		Long: `Creates a new snapshot of the configured directories.

Config is located at /etc/vaultik/config.yml by default, but can be overridden by 
specifying a path using --config or by setting VAULTIK_CONFIG to a path.`,
		Args: cobra.NoArgs,
		RunE: func(cmd *cobra.Command, args []string) error {
			// Use unified config resolution
			configPath, err := ResolveConfigPath()
			if err != nil {
				return err
			}

			// Use the backup functionality from cli package
			rootFlags := GetRootFlags()
			return RunWithApp(cmd.Context(), AppOptions{
				ConfigPath: configPath,
				LogOptions: log.LogOptions{
					Verbose: rootFlags.Verbose,
					Debug:   rootFlags.Debug,
					Cron:    opts.Cron,
				},
				Modules: []fx.Option{},
				Invokes: []fx.Option{
					fx.Invoke(func(v *vaultik.Vaultik, lc fx.Lifecycle) {
						lc.Append(fx.Hook{
							OnStart: func(ctx context.Context) error {
								// Start the snapshot creation in a goroutine
								go func() {
									// Run the snapshot creation
									if err := v.CreateSnapshot(opts); err != nil {
										if err != context.Canceled {
											log.Error("Snapshot creation failed", "error", err)
										}
									}

									// Shutdown the app when snapshot completes
									if err := v.Shutdowner.Shutdown(); err != nil {
										log.Error("Failed to shutdown", "error", err)
									}
								}()
								return nil
							},
							OnStop: func(ctx context.Context) error {
								log.Debug("Stopping snapshot creation")
								// Cancel the Vaultik context
								v.Cancel()
								return nil
							},
						})
					}),
				},
			})
		},
	}

	cmd.Flags().BoolVar(&opts.Daemon, "daemon", false, "Run in daemon mode with inotify monitoring")
	cmd.Flags().BoolVar(&opts.Cron, "cron", false, "Run in cron mode (silent unless error)")
	cmd.Flags().BoolVar(&opts.Prune, "prune", false, "Delete all previous snapshots and unreferenced blobs after backup")

	return cmd
}

// newSnapshotListCommand creates the 'snapshot list' subcommand
func newSnapshotListCommand() *cobra.Command {
	var jsonOutput bool

	cmd := &cobra.Command{
		Use:   "list",
		Short: "List all snapshots",
		Long:  "Lists all snapshots with their ID, timestamp, and compressed size",
		Args:  cobra.NoArgs,
		RunE: func(cmd *cobra.Command, args []string) error {
			// Use unified config resolution
			configPath, err := ResolveConfigPath()
			if err != nil {
				return err
			}

			rootFlags := GetRootFlags()
			return RunWithApp(cmd.Context(), AppOptions{
				ConfigPath: configPath,
				LogOptions: log.LogOptions{
					Verbose: rootFlags.Verbose,
					Debug:   rootFlags.Debug,
				},
				Modules: []fx.Option{},
				Invokes: []fx.Option{
					fx.Invoke(func(v *vaultik.Vaultik, lc fx.Lifecycle) {
						lc.Append(fx.Hook{
							OnStart: func(ctx context.Context) error {
								go func() {
									if err := v.ListSnapshots(jsonOutput); err != nil {
										if err != context.Canceled {
											log.Error("Failed to list snapshots", "error", err)
											os.Exit(1)
										}
									}
									if err := v.Shutdowner.Shutdown(); err != nil {
										log.Error("Failed to shutdown", "error", err)
									}
								}()
								return nil
							},
							OnStop: func(ctx context.Context) error {
								v.Cancel()
								return nil
							},
						})
					}),
				},
			})
		},
	}

	cmd.Flags().BoolVar(&jsonOutput, "json", false, "Output in JSON format")

	return cmd
}

// newSnapshotPurgeCommand creates the 'snapshot purge' subcommand
func newSnapshotPurgeCommand() *cobra.Command {
	var keepLatest bool
	var olderThan string
	var force bool

	cmd := &cobra.Command{
		Use:   "purge",
		Short: "Purge old snapshots",
		Long:  "Removes snapshots based on age or count criteria",
		Args:  cobra.NoArgs,
		RunE: func(cmd *cobra.Command, args []string) error {
			// Validate flags
			if !keepLatest && olderThan == "" {
				return fmt.Errorf("must specify either --keep-latest or --older-than")
			}
			if keepLatest && olderThan != "" {
				return fmt.Errorf("cannot specify both --keep-latest and --older-than")
			}

			// Use unified config resolution
			configPath, err := ResolveConfigPath()
			if err != nil {
				return err
			}

			rootFlags := GetRootFlags()
			return RunWithApp(cmd.Context(), AppOptions{
				ConfigPath: configPath,
				LogOptions: log.LogOptions{
					Verbose: rootFlags.Verbose,
					Debug:   rootFlags.Debug,
				},
				Modules: []fx.Option{},
				Invokes: []fx.Option{
					fx.Invoke(func(v *vaultik.Vaultik, lc fx.Lifecycle) {
						lc.Append(fx.Hook{
							OnStart: func(ctx context.Context) error {
								go func() {
									if err := v.PurgeSnapshots(keepLatest, olderThan, force); err != nil {
										if err != context.Canceled {
											log.Error("Failed to purge snapshots", "error", err)
											os.Exit(1)
										}
									}
									if err := v.Shutdowner.Shutdown(); err != nil {
										log.Error("Failed to shutdown", "error", err)
									}
								}()
								return nil
							},
							OnStop: func(ctx context.Context) error {
								v.Cancel()
								return nil
							},
						})
					}),
				},
			})
		},
	}

	cmd.Flags().BoolVar(&keepLatest, "keep-latest", false, "Keep only the latest snapshot")
	cmd.Flags().StringVar(&olderThan, "older-than", "", "Remove snapshots older than duration (e.g., 30d, 6m, 1y)")
	cmd.Flags().BoolVar(&force, "force", false, "Skip confirmation prompt")

	return cmd
}

// newSnapshotVerifyCommand creates the 'snapshot verify' subcommand
func newSnapshotVerifyCommand() *cobra.Command {
	var deep bool

	cmd := &cobra.Command{
		Use:   "verify <snapshot-id>",
		Short: "Verify snapshot integrity",
		Long:  "Verifies that all blobs referenced in a snapshot exist",
		Args:  cobra.ExactArgs(1),
		RunE: func(cmd *cobra.Command, args []string) error {
			snapshotID := args[0]

			// Use unified config resolution
			configPath, err := ResolveConfigPath()
			if err != nil {
				return err
			}

			rootFlags := GetRootFlags()
			return RunWithApp(cmd.Context(), AppOptions{
				ConfigPath: configPath,
				LogOptions: log.LogOptions{
					Verbose: rootFlags.Verbose,
					Debug:   rootFlags.Debug,
				},
				Modules: []fx.Option{},
				Invokes: []fx.Option{
					fx.Invoke(func(v *vaultik.Vaultik, lc fx.Lifecycle) {
						lc.Append(fx.Hook{
							OnStart: func(ctx context.Context) error {
								go func() {
									if err := v.VerifySnapshot(snapshotID, deep); err != nil {
										if err != context.Canceled {
											log.Error("Verification failed", "error", err)
											os.Exit(1)
										}
									}
									if err := v.Shutdowner.Shutdown(); err != nil {
										log.Error("Failed to shutdown", "error", err)
									}
								}()
								return nil
							},
							OnStop: func(ctx context.Context) error {
								v.Cancel()
								return nil
							},
						})
					}),
				},
			})
		},
	}

	cmd.Flags().BoolVar(&deep, "deep", false, "Download and verify blob hashes")

	return cmd
}