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"
	loginCmd := newLoginCmd()
	loginCmd.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"
	probeHWAccelCmd := newProbeHWAccelCmd()
	probeHWAccelCmd.GroupID = "system"
	cleanCmd := newCleanCmd()
	cleanCmd.GroupID = "system"
	mirrorsCmd := newMirrorsCmd()
	mirrorsCmd.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,
		loginCmd,
		configCmd,
		migrateCmd,
		// Search & Discovery
		searchCmd,
		inspectCmd,
		popularCmd,
		recentCmd,
		watchCmd,
		// Downloads & Streaming
		downloadCmd,
		streamCmd,
		// Daemon Management
		startCmd,
		stopCmd,
		statusCmd,
		daemonCmd,
		// System & Diagnostics
		statsCmd,
		doctorCmd,
		probeHWAccelCmd,
		cleanCmd,
		mirrorsCmd,
		selfUpdateCmd,
		versionCmd,
		completionCmd,
		// Library
		scanCmd,
		// Alias: upgrade → self-update
		newUpgradeCmd(),
	)
}

// 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
}