package cmd

import (
	"fmt"
	"os"

	"github.com/fatih/color"
	"github.com/spf13/cobra"
	tc "github.com/torrentclaw/go-client"
	"github.com/torrentclaw/unarr/internal/config"
	"github.com/torrentclaw/unarr/internal/sentry"
)

var (
	cfgFile    string
	apiKeyFlag string
	jsonOut    bool
	noColor    bool
	rootCmd    *cobra.Command
	apiClient  *tc.Client
	appCfg     config.Config
	cfgLoaded  bool
)

func init() {
	rootCmd = &cobra.Command{
		Use:   "unarr",
		Short: "unarr — torrent search and management",
		Long: `unarr is a powerful terminal tool for torrent search and management.

Search 30+ torrent sources, inspect torrent quality, discover popular content,
find streaming providers, and manage your media collection — all from your terminal.

Get started:
  unarr init                           First-time configuration wizard
  unarr search "breaking bad"          Search for content
  unarr start                          Start the download daemon

Documentation:  https://torrentclaw.com/cli
Source:         https://github.com/torrentclaw/unarr`,
		PersistentPreRun: func(cmd *cobra.Command, args []string) {
			if noColor || os.Getenv("NO_COLOR") != "" {
				color.NoColor = true
			}
		},
		SilenceUsage:  true,
		SilenceErrors: true,
	}

	// Command groups for organized help output
	rootCmd.AddGroup(
		&cobra.Group{ID: "start", Title: "Getting Started:"},
		&cobra.Group{ID: "search", Title: "Search & Discovery:"},
		&cobra.Group{ID: "download", Title: "Downloads & Streaming:"},
		&cobra.Group{ID: "daemon", Title: "Daemon Management:"},
		&cobra.Group{ID: "system", Title: "System & Diagnostics:"},
	)

	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default ~/.config/unarr/config.toml)")
	rootCmd.PersistentFlags().StringVar(&apiKeyFlag, "api-key", "", "API key (overrides config file and env)")
	rootCmd.PersistentFlags().BoolVar(&jsonOut, "json", false, "output as JSON (for piping)")
	rootCmd.PersistentFlags().BoolVar(&noColor, "no-color", false, "disable colored output")

	// Getting Started
	initCmd := newInitCmd()
	initCmd.GroupID = "start"
	configCmd := newConfigCmd()
	configCmd.GroupID = "start"
	migrateCmd := newMigrateCmd()
	migrateCmd.GroupID = "start"

	// Search & Discovery
	searchCmd := newSearchCmd()
	searchCmd.GroupID = "search"
	inspectCmd := newInspectCmd()
	inspectCmd.GroupID = "search"
	popularCmd := newPopularCmd()
	popularCmd.GroupID = "search"
	recentCmd := newRecentCmd()
	recentCmd.GroupID = "search"
	watchCmd := newWatchCmd()
	watchCmd.GroupID = "search"

	// Downloads & Streaming
	downloadCmd := newDownloadCmd()
	downloadCmd.GroupID = "download"
	streamCmd := newStreamCmd()
	streamCmd.GroupID = "download"

	// Daemon Management
	startCmd := newStartCmd()
	startCmd.GroupID = "daemon"
	stopCmd := newStopCmd()
	stopCmd.GroupID = "daemon"
	statusCmd := newStatusCmd()
	statusCmd.GroupID = "daemon"
	daemonCmd := newDaemonCmd()
	daemonCmd.GroupID = "daemon"

	// System & Diagnostics
	statsCmd := newStatsCmd()
	statsCmd.GroupID = "system"
	doctorCmd := newDoctorCmd()
	doctorCmd.GroupID = "system"
	cleanCmd := newCleanCmd()
	cleanCmd.GroupID = "system"
	selfUpdateCmd := newSelfUpdateCmd()
	selfUpdateCmd.GroupID = "system"
	versionCmd := newVersionCmd()
	versionCmd.GroupID = "system"
	completionCmd := newCompletionCmd()
	completionCmd.GroupID = "system"

	// Library
	scanCmd := newScanCmd()
	scanCmd.GroupID = "search"

	rootCmd.AddCommand(
		// Getting Started
		initCmd,
		configCmd,
		migrateCmd,
		// Search & Discovery
		searchCmd,
		inspectCmd,
		popularCmd,
		recentCmd,
		watchCmd,
		// Downloads & Streaming
		downloadCmd,
		streamCmd,
		// Daemon Management
		startCmd,
		stopCmd,
		statusCmd,
		daemonCmd,
		// System & Diagnostics
		statsCmd,
		doctorCmd,
		cleanCmd,
		selfUpdateCmd,
		versionCmd,
		completionCmd,
		// Library
		scanCmd,
		// Alias: upgrade → self-update
		newUpgradeCmd(),
		// Stubs for future commands
		newStubCmd("moreseed", "Find same quality with more seeders"),
		newStubCmd("compare", "Compare two torrents side by side"),
		newStubCmd("add", "Search and add torrents to your client"),
		newStubCmd("monitor", "Watch for new episodes of a series"),
		newStubCmd("open", "Open content in the browser"),
	)
}

// Execute runs the root command.
func Execute() {
	if err := rootCmd.Execute(); err != nil {
		// Report to Sentry with command context
		command := ""
		if cmd, _, cerr := rootCmd.Find(os.Args[1:]); cerr == nil && cmd != nil && cmd != rootCmd {
			command = cmd.Name()
		}
		sentry.CaptureError(err, command)
		sentry.Close() // Flush before os.Exit (defers don't run after os.Exit)

		fmt.Fprintln(os.Stderr, color.RedString("Error: %s", err))
		os.Exit(1)
	}
}

// loadConfig loads config once (lazy initialization).
func loadConfig() config.Config {
	if cfgLoaded {
		return appCfg
	}

	var err error
	appCfg, err = config.Load(cfgFile)
	if err != nil {
		fmt.Fprintln(os.Stderr, color.YellowString("Warning: config load failed: %s", err))
		appCfg = config.Default()
	}

	appCfg.ApplyEnvOverrides()
	cfgLoaded = true

	if appCfg.Agent.ID != "" {
		sentry.SetUser(appCfg.Agent.ID)
	}

	return appCfg
}

// getClient returns a configured API client, initializing it on first use.
func getClient() *tc.Client {
	if apiClient != nil {
		return apiClient
	}

	cfg := loadConfig()

	var opts []tc.Option

	if cfg.Auth.APIURL != "" {
		opts = append(opts, tc.WithBaseURL(cfg.Auth.APIURL))
	}

	apiKey := apiKeyFlag
	if apiKey == "" {
		apiKey = cfg.Auth.APIKey
	}
	if apiKey != "" {
		opts = append(opts, tc.WithAPIKey(apiKey))
	}

	opts = append(opts, tc.WithUserAgent("unarr/"+Version))

	apiClient = tc.NewClient(opts...)
	return apiClient
}