// Dynamic bot settings panel — toggle all settings from within the bot.
// No more .env edits needed! All changes are saved to MongoDB and cached in memory.

package plugins

import (
	"fmt"
	"regexp"
	"strconv"
	"strings"

	"github.com/Jisin0/Go-Filter-Bot/database"
	"github.com/Jisin0/Go-Filter-Bot/utils"
	"github.com/PaulSonOfLars/gotgbot/v2"
	"github.com/PaulSonOfLars/gotgbot/v2/ext"
)

var cbSettingsRegex = regexp.MustCompile(`settings\((.+)\)`)

func boolEmoji(v bool) string {
	if v {
		return "✅"
	}
	return "❌"
}

// buildSettingsMarkup generates the inline keyboard for the settings panel.
func buildSettingsMarkup(s database.BotSettings) gotgbot.InlineKeyboardMarkup {
	return gotgbot.InlineKeyboardMarkup{
		InlineKeyboard: [][]gotgbot.InlineKeyboardButton{
			{
				{Text: fmt.Sprintf("%s Multi Filter", boolEmoji(s.MultiFilter)), CallbackData: "settings(toggle_multi_filter)"},
			},
			{
				{Text: fmt.Sprintf("%s Search as Button", boolEmoji(s.SearchAsButton)), CallbackData: "settings(toggle_search_button)"},
			},
			{
				{Text: fmt.Sprintf("⏱ Auto Delete: %dm", s.AutoDelete), CallbackData: "settings(auto_delete)"},
			},
			{
				{Text: "🔗 Shortener URL", CallbackData: "settings(shortener_url)"},
				{Text: "🔑 Shortener API", CallbackData: "settings(shortener_api)"},
			},
			{
				{Text: fmt.Sprintf("📢 Force-Sub (%d ch)", len(s.ForceSubChats)), CallbackData: "settings(fsub_info)"},
				{Text: fmt.Sprintf("📁 Index (%d ch)", len(s.IndexChannels)), CallbackData: "settings(index_info)"},
			},
			{
				{Text: fmt.Sprintf("👑 Admins (%d dynamic)", len(s.DynamicAdmins)), CallbackData: "settings(admin_info)"},
			},
			{
				{Text: "🔄 Refresh", CallbackData: "settings(refresh)"},
				{Text: "✖ Close", CallbackData: "close"},
			},
		},
	}
}

// buildSettingsText generates the main settings panel text.
func buildSettingsText(s database.BotSettings) string {
	shortURL := s.ShortenerURL
	if shortURL == "" {
		shortURL = "<i>Not Set</i>"
	}
	shortAPI := "••••••"
	if s.ShortenerAPI == "" {
		shortAPI = "<i>Not Set</i>"
	}

	fsubList := "<i>None</i>"
	if len(s.ForceSubChats) > 0 {
		parts := make([]string, len(s.ForceSubChats))
		for i, c := range s.ForceSubChats {
			parts[i] = fmt.Sprintf("<code>%d</code>", c)
		}
		fsubList = strings.Join(parts, ", ")
	}

	indexList := "<i>None</i>"
	if len(s.IndexChannels) > 0 {
		parts := make([]string, len(s.IndexChannels))
		for i, c := range s.IndexChannels {
			parts[i] = fmt.Sprintf("<code>%d</code>", c)
		}
		indexList = strings.Join(parts, ", ")
	}

	return fmt.Sprintf(`<b>⚙️ Bᴏᴛ Sᴇᴛᴛɪɴɢs Pᴀɴᴇʟ</b>

<b>Multi Filter :</b> %s
<b>Search Mode :</b> %s
<b>Auto Delete :</b> %d minutes
<b>Shortener URL :</b> %s
<b>Shortener API :</b> %s
<b>Force-Sub :</b> %s
<b>Auto-Index :</b> %s
<b>Dynamic Admins :</b> %d

<i>Tap the buttons below to change settings.</i>
<i>Changes take effect immediately — no restart needed!</i>`,
		boolEmoji(s.MultiFilter),
		func() string {
			if s.SearchAsButton {
				return "Button"
			}
			return "Hyperlink"
		}(),
		s.AutoDelete,
		shortURL,
		shortAPI,
		fsubList,
		indexList,
		len(s.DynamicAdmins),
	)
}

// Settings handles the /settings command.
//
//nolint:errcheck
func Settings(bot *gotgbot.Bot, ctx *ext.Context) error {
	if !utils.IsAdmin(ctx.EffectiveUser.Id) {
		ctx.EffectiveMessage.Reply(bot, "⛔ Only bot admins can use this command!", &gotgbot.SendMessageOpts{})
		return nil
	}

	s := database.GetBotSettings()
	_, err := ctx.Message.Reply(bot, buildSettingsText(s), &gotgbot.SendMessageOpts{
		ParseMode:   gotgbot.ParseModeHTML,
		ReplyMarkup: buildSettingsMarkup(s),
	})
	if err != nil {
		fmt.Printf("settings: %v\n", err)
	}
	return nil
}

// CbSettings handles all settings callbacks.
//
//nolint:errcheck
func CbSettings(bot *gotgbot.Bot, ctx *ext.Context) error {
	update := ctx.CallbackQuery

	if !utils.IsAdmin(update.From.Id) {
		update.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{Text: "⛔ Only bot admins can change settings!", ShowAlert: true})
		return nil
	}

	match := cbSettingsRegex.FindStringSubmatch(update.Data)
	if len(match) < 2 {
		return nil
	}

	action := match[1]
	s := database.GetBotSettings()

	switch action {
	case "toggle_multi_filter":
		DB.SetBotSetting("multi_filter", !s.MultiFilter)
		update.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{
			Text: fmt.Sprintf("Multi Filter: %s", boolEmoji(!s.MultiFilter)),
		})

	case "toggle_search_button":
		DB.SetBotSetting("search_as_button", !s.SearchAsButton)
		update.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{
			Text: fmt.Sprintf("Search as Button: %s", boolEmoji(!s.SearchAsButton)),
		})

	case "auto_delete":
		// Cycle through: 0 → 5 → 10 → 30 → 60 → 0
		var next int64
		switch {
		case s.AutoDelete == 0:
			next = 5
		case s.AutoDelete < 10:
			next = 10
		case s.AutoDelete < 30:
			next = 30
		case s.AutoDelete < 60:
			next = 60
		default:
			next = 0
		}
		DB.SetBotSetting("auto_delete", next)
		if next == 0 {
			update.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{Text: "Auto Delete: OFF"})
		} else {
			update.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{Text: fmt.Sprintf("Auto Delete: %d minutes", next)})
		}

	case "shortener_url":
		update.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{})
		// Ask in PM — works from both group and PM contexts
		pmChat := &gotgbot.Chat{Id: update.From.Id, Type: gotgbot.ChatTypePrivate}
		m := utils.Ask(bot, "📝 Send the new <b>Shortener URL</b>\n\nExample: <code>fpshortner.in</code>\n\nSend <code>off</code> to disable.", pmChat, &update.From)
		if m == nil {
			return nil
		}
		val := strings.TrimSpace(m.Text)
		if strings.ToLower(val) == "off" {
			val = ""
		}
		DB.SetBotSetting("shortener_url", val)
		if val == "" {
			bot.SendMessage(update.From.Id, "✅ Shortener URL disabled.", &gotgbot.SendMessageOpts{})
		} else {
			bot.SendMessage(update.From.Id, fmt.Sprintf("✅ Shortener URL set to: <code>%s</code>", val), &gotgbot.SendMessageOpts{ParseMode: gotgbot.ParseModeHTML})
		}

	case "shortener_api":
		update.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{})
		pmChat := &gotgbot.Chat{Id: update.From.Id, Type: gotgbot.ChatTypePrivate}
		m := utils.Ask(bot, "📝 Send the new <b>Shortener API Key</b>\n\nSend <code>off</code> to disable.", pmChat, &update.From)
		if m == nil {
			return nil
		}
		val := strings.TrimSpace(m.Text)
		if strings.ToLower(val) == "off" {
			val = ""
		}
		DB.SetBotSetting("shortener_api", val)
		if val == "" {
			bot.SendMessage(update.From.Id, "✅ Shortener API disabled.", &gotgbot.SendMessageOpts{})
		} else {
			bot.SendMessage(update.From.Id, "✅ Shortener API Key updated!", &gotgbot.SendMessageOpts{})
		}

	case "fsub_info":
		text := "Use <code>/addfsub &lt;channel_id&gt;</code> to add\nUse <code>/delfsub &lt;channel_id&gt;</code> to remove\nUse <code>/fsub</code> to list"
		update.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{Text: "Manage with /addfsub, /delfsub, /fsub", ShowAlert: true})
		msg, ok := update.Message.(*gotgbot.Message)
		if !ok {
			return nil
		}
		bot.SendMessage(msg.Chat.Id, text, &gotgbot.SendMessageOpts{ParseMode: gotgbot.ParseModeHTML})
		return nil


	case "index_info":
		text := "Use <code>/addindex &lt;channel_id&gt;</code> to add\nUse <code>/delindex &lt;channel_id&gt;</code> to remove\nUse <code>/bulkindex &lt;channel_id&gt; [from] [to]</code> for bulk indexing"
		update.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{Text: "Manage with /addindex, /delindex, /bulkindex", ShowAlert: true})
		msg2, ok2 := update.Message.(*gotgbot.Message)
		if !ok2 {
			return nil
		}
		bot.SendMessage(msg2.Chat.Id, text, &gotgbot.SendMessageOpts{ParseMode: gotgbot.ParseModeHTML})
		return nil

	case "admin_info":
		text := "Use <code>/addadmin &lt;user_id&gt;</code> to add a dynamic admin\nUse <code>/deladmin &lt;user_id&gt;</code> to remove\nUse <code>/admins</code> to list all admins"
		update.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{Text: "Manage with /addadmin, /deladmin, /admins", ShowAlert: true})
		msg3, ok3 := update.Message.(*gotgbot.Message)
		if !ok3 {
			return nil
		}
		bot.SendMessage(msg3.Chat.Id, text, &gotgbot.SendMessageOpts{ParseMode: gotgbot.ParseModeHTML})
		return nil

	case "refresh":
		DB.RefreshBotSettings()
		update.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{Text: "♻️ Settings refreshed!"})

	default:
		// Handle set_autodelete_<value> from potential custom input
		if strings.HasPrefix(action, "set_autodelete_") {
			valStr := strings.TrimPrefix(action, "set_autodelete_")
			val, err := strconv.ParseInt(valStr, 10, 64)
			if err == nil {
				DB.SetBotSetting("auto_delete", val)
				update.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{Text: fmt.Sprintf("Auto Delete: %d min", val)})
			}
		}
	}

	// Refresh the settings panel with updated values
	newS := database.GetBotSettings()
	update.Message.EditText(bot, buildSettingsText(newS), &gotgbot.EditMessageTextOpts{
		ParseMode:   gotgbot.ParseModeHTML,
		ReplyMarkup: buildSettingsMarkup(newS),
	})

	return nil
}

// CbClose handles the close button on settings and other panels.
//
//nolint:errcheck
func CbClose(bot *gotgbot.Bot, ctx *ext.Context) error {
	ctx.CallbackQuery.Message.Delete(bot, nil)
	ctx.CallbackQuery.Answer(bot, &gotgbot.AnswerCallbackQueryOpts{})
	return nil
}