package help

import (
	"fmt"
	"sort"
	"strings"

	"git.nakama.town/fmartingr/butterrobot/internal/db"
	"git.nakama.town/fmartingr/butterrobot/internal/model"
	"git.nakama.town/fmartingr/butterrobot/internal/plugin"
	"golang.org/x/exp/slog"
)

// ChannelPluginGetter is an interface for getting channel plugins
type ChannelPluginGetter interface {
	GetChannelPlugins(channelID int64) ([]*model.ChannelPlugin, error)
	GetChannelPluginsFromPlatformID(platform, platformChannelID string) ([]*model.ChannelPlugin, error)
}

// HelpPlugin provides help information about available commands
type HelpPlugin struct {
	plugin.BasePlugin
	db ChannelPluginGetter
}

// New creates a new HelpPlugin instance
func New(db ChannelPluginGetter) *HelpPlugin {
	return &HelpPlugin{
		BasePlugin: plugin.BasePlugin{
			ID:   "utility.help",
			Name: "Help",
			Help: "Shows available commands when you type '!help'",
		},
		db: db,
	}
}

// OnMessage handles incoming messages
func (p *HelpPlugin) OnMessage(msg *model.Message, config map[string]interface{}, cache model.CacheInterface) []*model.MessageAction {
	// Check if message is the help command
	if !strings.EqualFold(strings.TrimSpace(msg.Text), "!help") {
		return nil
	}

	// Get channel plugins from database using platform and platform channel ID
	channelPlugins, err := p.db.GetChannelPluginsFromPlatformID(msg.Channel.Platform, msg.Channel.PlatformChannelID)
	if err != nil && err != db.ErrNotFound {
		slog.Error("Failed to get channel plugins", slog.Any("err", err))
		return []*model.MessageAction{}
	}

	// If no plugins found, initialize empty slice
	if err == db.ErrNotFound {
		channelPlugins = []*model.ChannelPlugin{}
	}

	// Get all available plugins
	availablePlugins := plugin.GetAvailablePlugins()

	// Filter to only enabled plugins for this channel
	enabledPlugins := make(map[string]model.Plugin)
	for _, channelPlugin := range channelPlugins {
		if channelPlugin.Enabled {
			if availablePlugin, exists := availablePlugins[channelPlugin.PluginID]; exists {
				enabledPlugins[channelPlugin.PluginID] = availablePlugin
			}
		}
	}

	// If no plugins are enabled, return a message
	if len(enabledPlugins) == 0 {
		response := &model.Message{
			Text:    "No plugins are currently enabled for this channel.",
			Chat:    msg.Chat,
			ReplyTo: msg.ID,
			Channel: msg.Channel,
		}

		return []*model.MessageAction{
			{
				Type:    model.ActionSendMessage,
				Message: response,
				Chat:    msg.Chat,
				Channel: msg.Channel,
			},
		}
	}

	// Group plugins by category
	categories := map[string][]model.Plugin{
		"Development":           {},
		"Fun and Entertainment": {},
		"Utility":               {},
		"Security":              {},
		"Social Media":          {},
		"Other":                 {},
	}

	// Categorize plugins based on their ID prefix
	for _, p := range enabledPlugins {
		category := p.GetID()
		switch {
		case strings.HasPrefix(category, "dev."):
			categories["Development"] = append(categories["Development"], p)
		case strings.HasPrefix(category, "fun."):
			categories["Fun and Entertainment"] = append(categories["Fun and Entertainment"], p)
		case strings.HasPrefix(category, "util.") || strings.HasPrefix(category, "reminder.") || strings.HasPrefix(category, "utility."):
			categories["Utility"] = append(categories["Utility"], p)
		case strings.HasPrefix(category, "security."):
			categories["Security"] = append(categories["Security"], p)
		case strings.HasPrefix(category, "social."):
			categories["Social Media"] = append(categories["Social Media"], p)
		default:
			categories["Other"] = append(categories["Other"], p)
		}
	}

	// Build the help message
	var helpText strings.Builder
	helpText.WriteString("🤖 **Available Commands**\n\n")

	// Sort category names for consistent output
	categoryOrder := []string{"Development", "Fun and Entertainment", "Utility", "Security", "Social Media", "Other"}

	for _, categoryName := range categoryOrder {
		pluginList := categories[categoryName]
		if len(pluginList) == 0 {
			continue
		}

		// Sort plugins within category by name
		sort.Slice(pluginList, func(i, j int) bool {
			return pluginList[i].GetName() < pluginList[j].GetName()
		})

		helpText.WriteString(fmt.Sprintf("**%s:**\n", categoryName))
		for _, p := range pluginList {
			if p.GetHelp() == "" {
				continue
			}
			helpText.WriteString(fmt.Sprintf("• **%s** - %s\n", p.GetName(), p.GetHelp()))
		}
		helpText.WriteString("\n")
	}

	// Add footer
	helpText.WriteString("_Use the specific commands or triggers mentioned above to interact with the bot._")

	response := &model.Message{
		Text:    helpText.String(),
		Chat:    msg.Chat,
		ReplyTo: msg.ID,
		Channel: msg.Channel,
	}

	return []*model.MessageAction{
		{
			Type:    model.ActionSendMessage,
			Message: response,
			Chat:    msg.Chat,
			Channel: msg.Channel,
		},
	}
}