package cmd

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

	"github.com/spf13/cobra"
	"github.com/steveyegge/gastown/internal/config"
	"github.com/steveyegge/gastown/internal/polecat"
	"github.com/steveyegge/gastown/internal/workspace"
)

var (
	namepoolListFlag  bool
	namepoolThemeFlag string
)

var namepoolCmd = &cobra.Command{
	Use:     "namepool",
	GroupID: GroupWorkspace,
	Short:   "Manage polecat name pools",
	Long: `Manage themed name pools for polecats in Gas Town.

By default, polecats get themed names from the Mad Max universe
(furiosa, nux, slit, etc.). You can change the theme or add custom names.

Examples:
  gt namepool              # Show current pool status
  gt namepool --list       # List available themes
  gt namepool themes       # Show theme names
  gt namepool set minerals # Set theme to 'minerals'
  gt namepool add ember    # Add custom name to pool
  gt namepool reset        # Reset pool state`,
	RunE: runNamepool,
}

var namepoolThemesCmd = &cobra.Command{
	Use:   "themes [theme]",
	Short: "List available themes and their names",
	RunE:  runNamepoolThemes,
}

var namepoolSetCmd = &cobra.Command{
	Use:   "set <theme>",
	Short: "Set the namepool theme for this rig",
	Args:  cobra.ExactArgs(1),
	RunE:  runNamepoolSet,
}

var namepoolAddCmd = &cobra.Command{
	Use:   "add <name>",
	Short: "Add a custom name to the pool",
	Args:  cobra.ExactArgs(1),
	RunE:  runNamepoolAdd,
}

var namepoolResetCmd = &cobra.Command{
	Use:   "reset",
	Short: "Reset the pool state (release all names)",
	RunE:  runNamepoolReset,
}

func init() {
	rootCmd.AddCommand(namepoolCmd)
	namepoolCmd.AddCommand(namepoolThemesCmd)
	namepoolCmd.AddCommand(namepoolSetCmd)
	namepoolCmd.AddCommand(namepoolAddCmd)
	namepoolCmd.AddCommand(namepoolResetCmd)
	namepoolCmd.Flags().BoolVarP(&namepoolListFlag, "list", "l", false, "List available themes")
}

func runNamepool(cmd *cobra.Command, args []string) error {
	// List themes mode
	if namepoolListFlag {
		return runNamepoolThemes(cmd, nil)
	}

	// Show current pool status
	rigName, rigPath := detectCurrentRigWithPath()
	if rigName == "" {
		return fmt.Errorf("not in a rig directory")
	}

	// Load pool
	pool := polecat.NewNamePool(rigPath, rigName)
	if err := pool.Load(); err != nil {
		// Pool doesn't exist yet, show defaults
		fmt.Printf("Rig: %s\n", rigName)
		fmt.Printf("Theme: %s (default)\n", polecat.DefaultTheme)
		fmt.Printf("Active polecats: 0\n")
		fmt.Printf("Max pool size: %d\n", polecat.DefaultPoolSize)
		return nil
	}

	// Show pool status
	fmt.Printf("Rig: %s\n", rigName)
	fmt.Printf("Theme: %s\n", pool.GetTheme())
	fmt.Printf("Active polecats: %d\n", pool.ActiveCount())
	
	activeNames := pool.ActiveNames()
	if len(activeNames) > 0 {
		fmt.Printf("In use: %s\n", strings.Join(activeNames, ", "))
	}

	// Check if configured
	settingsPath := filepath.Join(rigPath, "settings", "config.json")
	if settings, err := config.LoadRigSettings(settingsPath); err == nil && settings.Namepool != nil {
		fmt.Printf("(configured in settings/config.json)\n")
	}

	return nil
}

func runNamepoolThemes(cmd *cobra.Command, args []string) error {
	themes := polecat.ListThemes()

	if len(args) == 0 {
		// List all themes
		fmt.Println("Available themes:")
		for _, theme := range themes {
			names, _ := polecat.GetThemeNames(theme)
			fmt.Printf("\n  %s (%d names):\n", theme, len(names))
			// Show first 10 names
			preview := names
			if len(preview) > 10 {
				preview = preview[:10]
			}
			fmt.Printf("    %s...\n", strings.Join(preview, ", "))
		}
		return nil
	}

	// Show specific theme names
	theme := args[0]
	names, err := polecat.GetThemeNames(theme)
	if err != nil {
		return fmt.Errorf("unknown theme: %s (available: %s)", theme, strings.Join(themes, ", "))
	}

	fmt.Printf("Theme: %s (%d names)\n\n", theme, len(names))
	for i, name := range names {
		if i > 0 && i%5 == 0 {
			fmt.Println()
		}
		fmt.Printf("  %-12s", name)
	}
	fmt.Println()

	return nil
}

func runNamepoolSet(cmd *cobra.Command, args []string) error {
	theme := args[0]

	// Validate theme
	themes := polecat.ListThemes()
	valid := false
	for _, t := range themes {
		if t == theme {
			valid = true
			break
		}
	}
	if !valid {
		return fmt.Errorf("unknown theme: %s (available: %s)", theme, strings.Join(themes, ", "))
	}

	// Get rig
	rigName, rigPath := detectCurrentRigWithPath()
	if rigName == "" {
		return fmt.Errorf("not in a rig directory")
	}

	// Update pool
	pool := polecat.NewNamePool(rigPath, rigName)
	if err := pool.Load(); err != nil && !os.IsNotExist(err) {
		return fmt.Errorf("loading pool: %w", err)
	}
	
	if err := pool.SetTheme(theme); err != nil {
		return err
	}
	
	if err := pool.Save(); err != nil {
		return fmt.Errorf("saving pool: %w", err)
	}

	// Also save to rig config
	if err := saveRigNamepoolConfig(rigPath, theme, nil); err != nil {
		return fmt.Errorf("saving config: %w", err)
	}

	fmt.Printf("Theme '%s' set for rig '%s'\n", theme, rigName)
	fmt.Printf("New polecats will use names from this theme.\n")

	return nil
}

func runNamepoolAdd(cmd *cobra.Command, args []string) error {
	name := args[0]

	rigName, rigPath := detectCurrentRigWithPath()
	if rigName == "" {
		return fmt.Errorf("not in a rig directory")
	}

	// Load pool
	pool := polecat.NewNamePool(rigPath, rigName)
	if err := pool.Load(); err != nil && !os.IsNotExist(err) {
		return fmt.Errorf("loading pool: %w", err)
	}

	pool.AddCustomName(name)
	
	if err := pool.Save(); err != nil {
		return fmt.Errorf("saving pool: %w", err)
	}

	fmt.Printf("Added '%s' to the name pool\n", name)
	return nil
}

func runNamepoolReset(cmd *cobra.Command, args []string) error {
	rigName, rigPath := detectCurrentRigWithPath()
	if rigName == "" {
		return fmt.Errorf("not in a rig directory")
	}

	// Load pool
	pool := polecat.NewNamePool(rigPath, rigName)
	if err := pool.Load(); err != nil && !os.IsNotExist(err) {
		return fmt.Errorf("loading pool: %w", err)
	}

	pool.Reset()
	
	if err := pool.Save(); err != nil {
		return fmt.Errorf("saving pool: %w", err)
	}

	fmt.Printf("Pool reset for rig '%s'\n", rigName)
	fmt.Printf("All names released and available for reuse.\n")
	return nil
}

// detectCurrentRigWithPath determines the rig name and path from cwd.
func detectCurrentRigWithPath() (string, string) {
	cwd, err := os.Getwd()
	if err != nil {
		return "", ""
	}

	townRoot, err := workspace.FindFromCwd()
	if err != nil || townRoot == "" {
		return "", ""
	}

	// Get path relative to town root
	rel, err := filepath.Rel(townRoot, cwd)
	if err != nil {
		return "", ""
	}

	// Extract first path component (rig name)
	parts := strings.Split(rel, string(filepath.Separator))
	if len(parts) > 0 && parts[0] != "." && parts[0] != "mayor" && parts[0] != "deacon" {
		return parts[0], filepath.Join(townRoot, parts[0])
	}

	return "", ""
}

// saveRigNamepoolConfig saves the namepool config to rig settings.
func saveRigNamepoolConfig(rigPath, theme string, customNames []string) error {
	settingsPath := filepath.Join(rigPath, "settings", "config.json")

	// Load existing settings or create new
	var settings *config.RigSettings
	settings, err := config.LoadRigSettings(settingsPath)
	if err != nil {
		// Create new settings if not found
		if os.IsNotExist(err) || strings.Contains(err.Error(), "not found") {
			settings = config.NewRigSettings()
		} else {
			return fmt.Errorf("loading settings: %w", err)
		}
	}

	// Set namepool
	settings.Namepool = &config.NamepoolConfig{
		Style: theme,
		Names: customNames,
	}

	// Save (creates directory if needed)
	if err := config.SaveRigSettings(settingsPath, settings); err != nil {
		return fmt.Errorf("saving settings: %w", err)
	}

	return nil
}