package bot

import (
	"database/sql"
	"errors"
	"fmt"
	"log/slog"
	"strconv"
	"sync"
	"time"

	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"

	"worktimeBot/internal/db"
)

const rateLimitInterval = 2 * time.Second

type Handler struct {
	Bot          *tgbotapi.BotAPI
	DB           *db.Store
	AllowedUsers map[int64]bool
	lastMsgTime  map[int64]time.Time
	mu           sync.Mutex
}

func NewHandler(bot *tgbotapi.BotAPI, store *db.Store, allowed map[int64]bool) *Handler {
	return &Handler{
		Bot:          bot,
		DB:           store,
		AllowedUsers: allowed,
		lastMsgTime:  make(map[int64]time.Time),
	}
}

type actionFunc func(int64) (string, error)

func (h *Handler) isRateLimited(userID int64) bool {
	h.mu.Lock()
	defer h.mu.Unlock()
	now := time.Now()
	if last, ok := h.lastMsgTime[userID]; ok && now.Sub(last) < rateLimitInterval {
		return true
	}
	h.lastMsgTime[userID] = now
	return false
}

func (h *Handler) handleActionMsg(msg *tgbotapi.Message, fn actionFunc) {
	text, err := fn(msg.Chat.ID)
	if err != nil {
		h.sendText(msg.Chat.ID, err.Error())
		return
	}
	reply := tgbotapi.NewMessage(msg.Chat.ID, text)
	reply.ReplyMarkup = mainKeyboard()
	h.Bot.Send(reply)
}

func (h *Handler) handleActionCallback(chatID int64, msgID int, callbackID string, fn actionFunc) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	text, err := fn(chatID)
	if err != nil {
		text = err.Error()
	}
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	kb := backKeyboard()
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) HandleMessage(update tgbotapi.Update) {
	msg := update.Message
	if len(h.AllowedUsers) > 0 && !h.AllowedUsers[msg.Chat.ID] {
		return
	}
	user, err := h.getOrCreateUser(msg.Chat.ID)
	if err != nil {
		return
	}
	if h.isRateLimited(user.ID) {
		return
	}
	slog.Info("message", "chat_id", msg.Chat.ID, "text", msg.Text)
	switch msg.Text {
	case "/start":
		h.handleStart(msg)
	case "/help":
		h.handleHelp(msg)
	case "/clockin":
		h.handleActionMsg(msg, h.clockIn)
	case "/clockout":
		h.handleActionMsg(msg, h.clockOut)
	case "/worktype":
		h.handleWorkTypeMsg(msg)
	case "/report":
		h.handleActionMsg(msg, h.report)
	case "/export":
		h.handleExport(msg)
	case "/dayoff":
		h.handleActionMsg(msg, h.dayOff)
	case "/history":
		h.handleHistoryMsg(msg)
	case "/edit":
		h.handleEditMsg(msg)
	case "/reporttoggle":
		h.handleActionMsg(msg, h.toggleReport)
	case "/setreporttime":
		h.handleSetReportTime(msg)
	case "/setaccent":
		h.handleAccentMsg(msg)
	case "/settimezone":
		h.handleSetTimezone(msg)
	default:
		h.sendText(msg.Chat.ID, "Unknown command")
	}
}

func (h *Handler) HandleCallback(update tgbotapi.Update) {
	cb := update.CallbackQuery
	if len(h.AllowedUsers) > 0 && !h.AllowedUsers[cb.Message.Chat.ID] {
		h.Bot.Request(tgbotapi.NewCallback(cb.ID, "Unauthorized"))
		return
	}
	user, err := h.getOrCreateUser(cb.Message.Chat.ID)
	if err != nil {
		h.Bot.Request(tgbotapi.NewCallback(cb.ID, ""))
		return
	}
	if h.isRateLimited(user.ID) {
		h.Bot.Request(tgbotapi.NewCallback(cb.ID, ""))
		return
	}
	slog.Info("callback", "chat_id", cb.Message.Chat.ID, "data", cb.Data)
	chatID := cb.Message.Chat.ID
	msgID := cb.Message.MessageID

	switch cb.Data {
	case "clockin":
		h.handleActionCallback(chatID, msgID, cb.ID, h.clockIn)
	case "clockout":
		h.handleActionCallback(chatID, msgID, cb.ID, h.clockOut)
	case "worktype":
		h.workTypeCallback(chatID, msgID, cb.ID)
	case "report":
		h.handleActionCallback(chatID, msgID, cb.ID, h.report)
	case "export":
		h.exportCallback(chatID, msgID, cb.ID)
	case "noop":
		h.Bot.Request(tgbotapi.NewCallback(cb.ID, ""))
	case "dayoff":
		h.handleActionCallback(chatID, msgID, cb.ID, h.dayOff)
	case "settings":
		h.settingsCallback(chatID, msgID, cb.ID)
	case "caltype":
		h.calTypeCallback(chatID, msgID, cb.ID)
	case "accent":
		h.accentCallback(chatID, msgID, cb.ID)
	case "timezone":
		h.timezoneCallback(chatID, msgID, cb.ID)
	case "history":
		h.historyCallback(chatID, msgID, cb.ID)
	case "reporttoggle":
		h.handleActionCallback(chatID, msgID, cb.ID, h.toggleReport)
	case "reporttime":
		h.reportTimeCallback(chatID, msgID, cb.ID)
	case "back_menu":
		h.backToMenu(chatID, msgID, cb.ID)
	case "back_settings":
		h.backToSettings(chatID, msgID, cb.ID)
	default:
		if len(cb.Data) > 9 && cb.Data[:9] == "worktype_" {
			h.selectWorkType(chatID, msgID, cb.ID, cb.Data[9:])
			return
		}
		if len(cb.Data) > 7 && cb.Data[:7] == "accent_" {
			h.selectAccent(chatID, msgID, cb.ID, cb.Data[7:])
			return
		}
		if len(cb.Data) > 8 && cb.Data[:8] == "caltype_" {
			h.selectCalendar(chatID, msgID, cb.ID, cb.Data[8:])
			return
		}
		h.handleHistoryCallback(chatID, msgID, cb.ID, cb.Data)
	}
}

func (h *Handler) getOrCreateUser(chatID int64) (*db.User, error) {
	return h.DB.GetOrCreateUser(chatID)
}

func (h *Handler) getUserToday(chatID int64) (*db.User, *db.Day, error) {
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return nil, nil, err
	}
	loc, err := time.LoadLocation(user.Timezone)
	if err != nil {
		loc = time.UTC
	}
	today := time.Now().In(loc).Format("2006-01-02")
	day, err := h.DB.GetOrCreateDay(user.ID, today)
	if err != nil {
		return nil, nil, err
	}
	return user, day, nil
}

func (h *Handler) clockIn(chatID int64) (string, error) {
	user, day, err := h.getUserToday(chatID)
	if err != nil {
		return "", err
	}

	last, err := h.DB.GetLastEvent(user.ID)
	if err != nil && err != sql.ErrNoRows {
		return "", err
	}

	if last != nil && last.EventType == "in" {
		loc, _ := time.LoadLocation(user.Timezone)
		now := time.Now().In(loc)
		lastTime := time.Unix(last.OccurredAt, 0).In(loc)
		if lastTime.Format("2006-01-02") == now.Format("2006-01-02") {
			return "", errors.New("Already clocked in")
		}
	}

	loc, _ := time.LoadLocation(user.Timezone)
	now := time.Now().In(loc)
	wt := day.CurrentWorkTypeID
	if err := h.DB.CreateEvent(user.ID, day.ID, "in", &wt, now.Unix(), ""); err != nil {
		return "", err
	}
	return fmt.Sprintf("Clocked in at %s", now.Format("15:04")), nil
}

func (h *Handler) clockOut(chatID int64) (string, error) {
	user, day, err := h.getUserToday(chatID)
	if err != nil {
		return "", err
	}
	last, err := h.DB.GetLastEvent(user.ID)
	if err != nil {
		return "", err
	}
	if last == nil {
		return "", errors.New("No clock-in found. Start with /clockin first")
	}
	if last.EventType == "out" {
		return "", errors.New("Already clocked out")
	}
	loc, _ := time.LoadLocation(user.Timezone)
	now := time.Now().In(loc)
	if err := h.DB.CreateEvent(user.ID, day.ID, "out", nil, now.Unix(), ""); err != nil {
		return "", err
	}
	return fmt.Sprintf("Clocked out at %s", now.Format("15:04")), nil
}

func (h *Handler) dayOff(chatID int64) (string, error) {
	user, day, err := h.getUserToday(chatID)
	if err != nil {
		return "", err
	}
	if day.IsDayOff {
		if err := h.DB.RemoveDayOff(user.ID, day.Date); err != nil {
			return "", err
		}
		return "Day off removed", nil
	}
	if err := h.DB.SetDayOff(user.ID, day.Date, ""); err != nil {
		return "", err
	}
	return "Today marked as day off", nil
}

func (h *Handler) report(chatID int64) (string, error) {
	user, day, err := h.getUserToday(chatID)
	if err != nil {
		return "", err
	}
	events, err := h.DB.EventsForDayByDayID(day.ID)
	if err != nil {
		return "", err
	}
	return h.buildDailyReport(user, day, events), nil
}

func (h *Handler) toggleReport(chatID int64) (string, error) {
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return "", err
	}
	user.ReportEnabled = !user.ReportEnabled
	if err := h.DB.UpdateUser(user); err != nil {
		return "", err
	}
	if user.ReportEnabled {
		return "Daily report enabled", nil
	}
	return "Daily report disabled", nil
}

func (h *Handler) handleSetReportTime(msg *tgbotapi.Message) {
	arg := msg.CommandArguments()
	if arg == "" {
		user, err := h.getOrCreateUser(msg.Chat.ID)
		if err != nil {
			h.sendText(msg.Chat.ID, "Error loading profile")
			return
		}
		h.sendText(msg.Chat.ID, fmt.Sprintf("Current report time: %s\nUsage: /setreporttime HH:MM (24-hour)", user.ReportTime))
		return
	}
	if len(arg) != 5 || arg[2] != ':' {
		h.sendText(msg.Chat.ID, "Invalid format. Usage: /setreporttime HH:MM (24-hour)")
		return
	}
	hours, err1 := strconv.Atoi(arg[:2])
	mins, err2 := strconv.Atoi(arg[3:])
	if err1 != nil || err2 != nil || hours < 0 || hours > 23 || mins < 0 || mins > 59 {
		h.sendText(msg.Chat.ID, "Invalid time. Usage: /setreporttime HH:MM (24-hour)")
		return
	}
	user, err := h.getOrCreateUser(msg.Chat.ID)
	if err != nil {
		h.sendText(msg.Chat.ID, "Error updating report time")
		return
	}
	user.ReportTime = arg
	if err := h.DB.UpdateUser(user); err != nil {
		h.sendText(msg.Chat.ID, "Error updating report time")
		return
	}
	h.sendText(msg.Chat.ID, fmt.Sprintf("Report time set to %s", arg))
}

func (h *Handler) handleAccentMsg(msg *tgbotapi.Message) {
	user, err := h.getOrCreateUser(msg.Chat.ID)
	if err != nil {
		h.sendText(msg.Chat.ID, "Error loading profile")
		return
	}
	text, kb := h.buildAccentKeyboard(user)
	reply := tgbotapi.NewMessage(msg.Chat.ID, text)
	reply.ReplyMarkup = &kb
	h.Bot.Send(reply)
}

func (h *Handler) handleSetTimezone(msg *tgbotapi.Message) {
	arg := msg.CommandArguments()
	if arg == "" {
		user, err := h.getOrCreateUser(msg.Chat.ID)
		if err != nil {
			h.sendText(msg.Chat.ID, "Error loading profile")
			return
		}
		h.sendText(msg.Chat.ID, fmt.Sprintf("Current timezone: %s\nUsage: /settimezone <IANA timezone>\nExamples: Asia/Tehran, Europe/London, America/New_York", user.Timezone))
		return
	}
	loc, err := time.LoadLocation(arg)
	if err != nil {
		h.sendText(msg.Chat.ID, fmt.Sprintf("Invalid timezone: %s\nUse IANA format, e.g. Asia/Tehran, Europe/London", arg))
		return
	}
	user, err := h.getOrCreateUser(msg.Chat.ID)
	if err != nil {
		h.sendText(msg.Chat.ID, "Error loading profile")
		return
	}
	user.Timezone = arg
	if err := h.DB.UpdateUser(user); err != nil {
		h.sendText(msg.Chat.ID, "Error saving timezone")
		return
	}
	now := time.Now().In(loc)
	h.sendText(msg.Chat.ID, fmt.Sprintf("Timezone set to %s (current time: %s)", arg, now.Format("15:04")))
}

func (h *Handler) handleStart(msg *tgbotapi.Message) {
	user, err := h.getOrCreateUser(msg.Chat.ID)
	if err != nil {
		slog.Error("start: create user", "error", err)
		h.sendText(msg.Chat.ID, "Error setting up your profile")
		return
	}
	slog.Info("start", "user_id", user.ID, "chat_id", msg.Chat.ID)
	menu := tgbotapi.NewMessage(msg.Chat.ID, h.buildStatusText(msg.Chat.ID))
	menu.ReplyMarkup = mainKeyboard()
	h.Bot.Send(menu)
}

func (h *Handler) handleHelp(msg *tgbotapi.Message) {
	text := `Commands:
/start - Show main menu
/clockin - Clock in
/clockout - Clock out
/worktype - Select work type
/dayoff - Toggle day off
/report - Show today report
/export - Export monthly report (Excel)
/history - View calendar history
/edit YYYY-MM-DD - Edit a specific day
/reporttoggle - Enable/disable auto report
/setreporttime HH:MM - Set daily report time
/setaccent - Select accent color
/settimezone <name> - Set your timezone (e.g. Asia/Tehran)

Buttons on the main menu also work.`
	h.sendText(msg.Chat.ID, text)
}

func (h *Handler) handleWorkTypeMsg(msg *tgbotapi.Message) {
	user, day, err := h.getUserToday(msg.Chat.ID)
	if err != nil {
		h.sendText(msg.Chat.ID, "Error loading work types")
		return
	}
	text, kb := h.buildWorkTypeKeyboard(user, day)
	reply := tgbotapi.NewMessage(msg.Chat.ID, text)
	reply.ReplyMarkup = &kb
	h.Bot.Send(reply)
}

func (h *Handler) workTypeCallback(chatID int64, msgID int, callbackID string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	user, day, err := h.getUserToday(chatID)
	if err != nil {
		edit := tgbotapi.NewEditMessageText(chatID, msgID, "Error loading work types")
		kb := backKeyboard()
		edit.ReplyMarkup = &kb
		h.Bot.Send(edit)
		return
	}
	text, kb := h.buildWorkTypeKeyboard(user, day)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) buildWorkTypeKeyboard(user *db.User, day *db.Day) (string, tgbotapi.InlineKeyboardMarkup) {
	wts, err := h.DB.GetWorkTypes()
	if err != nil || len(wts) == 0 {
		return "No work types available.", backKeyboard()
	}
	text := "Select work type:"
	var rows [][]tgbotapi.InlineKeyboardButton
	for _, wt := range wts {
		label := wt.Name
		if wt.ID == day.CurrentWorkTypeID {
			label = "> " + wt.Name
		}
		rows = append(rows, tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData(label, fmt.Sprintf("worktype_%d", wt.ID)),
		))
	}
	rows = append(rows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData("Back to Menu", "back_menu"),
	))
	return text, tgbotapi.NewInlineKeyboardMarkup(rows...)
}

func (h *Handler) selectWorkType(chatID int64, msgID int, callbackID, idStr string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	_, day, err := h.getUserToday(chatID)
	if err != nil {
		return
	}
	var wtID int64
	if _, err := fmt.Sscanf(idStr, "%d", &wtID); err != nil {
		return
	}
	wt, err := h.DB.GetWorkType(wtID)
	if err != nil {
		return
	}
	day.CurrentWorkTypeID = wtID
	if err := h.DB.UpdateDay(day); err != nil {
		return
	}
	text := fmt.Sprintf("Work type set to: %s", wt.Name)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	kb := backKeyboard()
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) settingsCallback(chatID int64, msgID int, callbackID string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	text, kb := h.buildSettingsKeyboard(user)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) buildSettingsKeyboard(user *db.User) (string, tgbotapi.InlineKeyboardMarkup) {
	reportStatus := "disabled"
	if user.ReportEnabled {
		reportStatus = "enabled"
	}
	var rows [][]tgbotapi.InlineKeyboardButton
	rows = append(rows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData(fmt.Sprintf("Timezone: %s", user.Timezone), "timezone"),
	))
	rows = append(rows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData(fmt.Sprintf("Accent: %s", user.ExportAccent), "accent"),
	))
	rows = append(rows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData(fmt.Sprintf("Calendar: %s", user.Calendar), "caltype"),
	))
	rows = append(rows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData(fmt.Sprintf("Report: %s", reportStatus), "reporttoggle"),
	))
	rows = append(rows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData(fmt.Sprintf("Report time: %s", user.ReportTime), "reporttime"),
	))
	rows = append(rows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData("History", "history"),
	))
	rows = append(rows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData("Back to Menu", "back_menu"),
	))
	return "Settings:", tgbotapi.NewInlineKeyboardMarkup(rows...)
}

func (h *Handler) accentCallback(chatID int64, msgID int, callbackID string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	text, kb := h.buildAccentKeyboard(user)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) timezoneCallback(chatID int64, msgID int, callbackID string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	text := fmt.Sprintf("Current timezone: %s\n\nUse /settimezone <name> to change it.\nExamples: Asia/Tehran, Europe/London, America/New_York", user.Timezone)
	kb := tgbotapi.NewInlineKeyboardMarkup(
		tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData("Back to Settings", "back_settings"),
		),
	)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) buildAccentKeyboard(user *db.User) (string, tgbotapi.InlineKeyboardMarkup) {
	accents := []struct {
		name  string
		color string
	}{
		{"ocean", "Blue"},
		{"beach", "Warm"},
		{"rose", "Pink"},
		{"catppuccin", "Purple"},
	}
	var rows [][]tgbotapi.InlineKeyboardButton
	for _, a := range accents {
		label := fmt.Sprintf("%s (%s)", a.name, a.color)
		if a.name == user.ExportAccent {
			label = "> " + label
		}
		rows = append(rows, tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData(label, "accent_"+a.name),
		))
	}
	rows = append(rows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData("Back to Settings", "back_settings"),
	))
	return "Select accent color:", tgbotapi.NewInlineKeyboardMarkup(rows...)
}

func (h *Handler) selectAccent(chatID int64, msgID int, callbackID, name string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	valid := map[string]bool{"ocean": true, "beach": true, "rose": true, "catppuccin": true}
	if !valid[name] {
		return
	}
	user.ExportAccent = name
	if err := h.DB.UpdateUser(user); err != nil {
		return
	}
	text := fmt.Sprintf("Accent set to: %s", name)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	kb := tgbotapi.NewInlineKeyboardMarkup(
		tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData("Back to Settings", "back_settings"),
		),
	)
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) reportTimeCallback(chatID int64, msgID int, callbackID string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	text := fmt.Sprintf("Current report time: %s\nUse /setreporttime HH:MM to change it.", user.ReportTime)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	kb := tgbotapi.NewInlineKeyboardMarkup(
		tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData("Back to Settings", "back_settings"),
		),
	)
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) backToSettings(chatID int64, msgID int, callbackID string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	text, kb := h.buildSettingsKeyboard(user)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) calTypeCallback(chatID int64, msgID int, callbackID string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	text, kb := h.buildCalendarKeyboard(user)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) buildCalendarKeyboard(user *db.User) (string, tgbotapi.InlineKeyboardMarkup) {
	cals := []string{"gregorian", "jalali", "hijri"}
	calLabels := map[string]string{
		"gregorian": "Gregorian",
		"jalali":    "Jalali",
		"hijri":     "Hijri",
	}
	var rows [][]tgbotapi.InlineKeyboardButton
	for _, c := range cals {
		label := calLabels[c]
		if c == user.Calendar {
			label = "> " + label
		}
		rows = append(rows, tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData(label, "caltype_"+c),
		))
	}
	rows = append(rows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData("Back to Settings", "back_settings"),
	))
	return "Select calendar type:", tgbotapi.NewInlineKeyboardMarkup(rows...)
}

func (h *Handler) selectCalendar(chatID int64, msgID int, callbackID, name string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	valid := map[string]bool{"gregorian": true, "jalali": true, "hijri": true}
	if !valid[name] {
		return
	}
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	user.Calendar = name
	if err := h.DB.UpdateUser(user); err != nil {
		return
	}
	text, kb := h.buildSettingsKeyboard(user)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) handleHistoryMsg(msg *tgbotapi.Message) {
	h.sendCalendar(msg.Chat.ID, 0, 0, 0)
}

func (h *Handler) historyCallback(chatID int64, msgID int, callbackID string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	h.editCalendar(chatID, msgID, 0, 0)
}

func (h *Handler) handleEditMsg(msg *tgbotapi.Message) {
	date := msg.CommandArguments()
	if date == "" {
		h.sendText(msg.Chat.ID, "Usage: /edit YYYY-MM-DD")
		return
	}
	if len(date) != 10 || date[4] != '-' || date[7] != '-' {
		h.sendText(msg.Chat.ID, "Invalid date. Use: /edit YYYY-MM-DD")
		return
	}
	user, err := h.getOrCreateUser(msg.Chat.ID)
	if err != nil {
		h.sendText(msg.Chat.ID, "Error loading profile")
		return
	}
	loc, _ := time.LoadLocation(user.Timezone)
	h.sendDayView(msg.Chat.ID, 0, user, date, loc, true)
}

func (h *Handler) handleHistoryCallback(chatID int64, msgID int, callbackID, data string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	loc, _ := time.LoadLocation(user.Timezone)

	if data == "history" {
		h.editCalendar(chatID, msgID, 0, 0)
		return
	}

	var y, m int
	var date string
	var eid int64

	// cal_prev_YYYY_M
	if n, _ := fmt.Sscanf(data, "cal_prev_%d_%d", &y, &m); n == 2 {
		m--
		if m < 1 {
			m = 12
			y--
		}
		h.editCalendar(chatID, msgID, y, m)
		return
	}
	// cal_next_YYYY_M
	if n, _ := fmt.Sscanf(data, "cal_next_%d_%d", &y, &m); n == 2 {
		m++
		if m > 12 {
			m = 1
			y++
		}
		h.editCalendar(chatID, msgID, y, m)
		return
	}
	// cal_day_DATE
	if n, _ := fmt.Sscanf(data, "cal_day_%s", &date); n == 1 && len(date) == 10 {
		h.editDayView(chatID, msgID, user, date, loc)
		return
	}
	// back_day_EVENTID -> go back to day view
	if n, _ := fmt.Sscanf(data, "back_day_%d", &eid); n == 1 {
		h.backToDayView(chatID, msgID, user, eid, loc)
		return
	}
	// settype_EVENTID_WTID
	var wtid int64
	if n, _ := fmt.Sscanf(data, "settype_%d_%d", &eid, &wtid); n == 2 {
		h.setEventWorkType(chatID, msgID, user, eid, wtid, loc)
		return
	}
	// edit_type_EVENTID -> show work type picker
	if n, _ := fmt.Sscanf(data, "edit_type_%d", &eid); n == 1 {
		h.editEventType(chatID, msgID, user, eid, loc)
		return
	}
	// delete_EVENTID
	if n, _ := fmt.Sscanf(data, "delete_%d", &eid); n == 1 {
		h.deleteEventPrompt(chatID, msgID, user, eid, loc)
		return
	}
	// delconf_EVENTID
	if n, _ := fmt.Sscanf(data, "delconf_%d", &eid); n == 1 {
		h.deleteEventConfirm(chatID, msgID, user, eid, loc)
		return
	}
	// edit_time_EVENTID -> show hour picker
	if n, _ := fmt.Sscanf(data, "edit_time_%d", &eid); n == 1 {
		h.editEventTime(chatID, msgID, user, eid, loc)
		return
	}
	// edittm_EVENTID_HH_MM -> set time
	var hh, mm int
	if n, _ := fmt.Sscanf(data, "edittm_%d_%d_%d", &eid, &hh, &mm); n == 3 {
		h.editEventTimeSet(chatID, msgID, user, eid, hh, mm, loc)
		return
	}
	// edittm_EVENTID_HH -> show minute picker
	if n, _ := fmt.Sscanf(data, "edittm_%d_%d", &eid, &hh); n == 2 {
		h.editEventTimeMin(chatID, msgID, user, eid, hh, loc)
		return
	}
}

func (h *Handler) sendCalendar(chatID int64, msgID int, year, month int) {
	h.editCalendar(chatID, msgID, year, month)
}

func (h *Handler) editCalendar(chatID int64, msgID int, year, month int) {
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return
	}
	loc, _ := time.LoadLocation(user.Timezone)
	now := time.Now().In(loc)

	if year == 0 || month == 0 {
		switch user.Calendar {
		case "jalali":
			jy, jm, _ := gregorianToJalali(now.Year(), int(now.Month()), now.Day())
			year, month = jy, jm
		case "hijri":
			hy, hm, _ := gregorianToHijri(now.Year(), int(now.Month()), now.Day())
			year, month = hy, hm
		default:
			year, month = now.Year(), int(now.Month())
		}
	}

	cal := user.Calendar
	cm := buildCalendarMonth(cal, year, month)

	text := cm.title
	todayKey := now.Format("2006-01-02")

	hasEvent := make(map[string]bool)
	if cal == "jalali" {
		gy, gm, _ := jalaliToGregorian(year, month, 1)
		lastDay := monthLenJalali(year, month)
		gyEnd, gmEnd, gdEnd := jalaliToGregorian(year, month, lastDay)
		startDate := fmt.Sprintf("%04d-%02d-%02d", gy, gm, 1)
		endDate := fmt.Sprintf("%04d-%02d-%02d", gyEnd, gmEnd, gdEnd)
		rows, err := h.DB.DB().Query(
			"SELECT DISTINCT date FROM days WHERE user_id=? AND date >= ? AND date <= ?",
			user.ID, startDate, endDate,
		)
		if err == nil {
			for rows.Next() {
				var d string
				rows.Scan(&d)
				hasEvent[d] = true
			}
			rows.Close()
		}
	} else if cal == "hijri" {
		gy, gm, _ := hijriToGregorian(year, month, 1)
		lastDay := monthLenHijri(year, month)
		gyEnd, gmEnd, gdEnd := hijriToGregorian(year, month, lastDay)
		startDate := fmt.Sprintf("%04d-%02d-%02d", gy, gm, 1)
		endDate := fmt.Sprintf("%04d-%02d-%02d", gyEnd, gmEnd, gdEnd)
		rows, err := h.DB.DB().Query(
			"SELECT DISTINCT date FROM days WHERE user_id=? AND date >= ? AND date <= ?",
			user.ID, startDate, endDate,
		)
		if err == nil {
			for rows.Next() {
				var d string
				rows.Scan(&d)
				hasEvent[d] = true
			}
			rows.Close()
		}
	} else {
		startDate := fmt.Sprintf("%04d-%02d-%02d", year, month, 1)
		endDate := fmt.Sprintf("%04d-%02d-%02d", year, month, monthLenGreg(year, month))
		rows, err := h.DB.DB().Query(
			"SELECT DISTINCT date FROM days WHERE user_id=? AND date >= ? AND date <= ?",
			user.ID, startDate, endDate,
		)
		if err == nil {
			for rows.Next() {
				var d string
				rows.Scan(&d)
				hasEvent[d] = true
			}
			rows.Close()
		}
	}

	var kbRows [][]tgbotapi.InlineKeyboardButton

	var headerRow []tgbotapi.InlineKeyboardButton
	for _, wn := range cm.weekDays {
		headerRow = append(headerRow, tgbotapi.NewInlineKeyboardButtonData(wn, "noop"))
	}
	kbRows = append(kbRows, headerRow)

	var row []tgbotapi.InlineKeyboardButton
	for i, d := range cm.days {
		if d.dayNum == 0 {
			row = append(row, tgbotapi.NewInlineKeyboardButtonData(" ", "noop"))
		} else {
			label := fmt.Sprintf("%d", d.dayNum)
			if d.date == todayKey {
				label = fmt.Sprintf("[%d]", d.dayNum)
			} else if hasEvent[d.date] {
				label = fmt.Sprintf("%d*", d.dayNum)
			}
			row = append(row, tgbotapi.NewInlineKeyboardButtonData(label, "cal_day_"+d.date))
		}
		if len(row) == 7 || i == len(cm.days)-1 {
			kbRows = append(kbRows, row)
			row = nil
		}
	}

	var prevY, prevM, nextY, nextM int
	prevY, prevM = year, month-1
	if prevM < 1 {
		prevM = 12
		prevY--
	}
	nextY, nextM = year, month+1
	if nextM > 12 {
		nextM = 1
		nextY++
	}

	navRow := tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData("<", fmt.Sprintf("cal_prev_%d_%d", prevY, prevM)),
		tgbotapi.NewInlineKeyboardButtonData("Today", "history"),
		tgbotapi.NewInlineKeyboardButtonData(">", fmt.Sprintf("cal_next_%d_%d", nextY, nextM)),
	)
	kbRows = append(kbRows, navRow)

	kbRows = append(kbRows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData("Back to Menu", "back_menu"),
	))

	kb := tgbotapi.NewInlineKeyboardMarkup(kbRows...)

	if msgID == 0 {
		reply := tgbotapi.NewMessage(chatID, text)
		reply.ReplyMarkup = &kb
		h.Bot.Send(reply)
	} else {
		edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
		edit.ReplyMarkup = &kb
		h.Bot.Send(edit)
	}
}

func (h *Handler) editDayView(chatID int64, msgID int, user *db.User, date string, loc *time.Location) {
	h.sendDayView(chatID, msgID, user, date, loc, false)
}

func (h *Handler) sendDayView(chatID int64, msgID int, user *db.User, date string, loc *time.Location, isNewMsg bool) {
	events, err := h.DB.EventsForDayByDate(user.ID, date)
	if err != nil {
		if isNewMsg {
			h.sendText(chatID, "Error loading events")
		}
		return
	}

	text := fmt.Sprintf("Date: %s", formatDateForCalendar(date, user.Calendar))
	if len(events) == 0 {
		text += "\nNo events for this day."
		kb := tgbotapi.NewInlineKeyboardMarkup(
			tgbotapi.NewInlineKeyboardRow(
				tgbotapi.NewInlineKeyboardButtonData("Back to Calendar", "history"),
			),
		)
		if isNewMsg || msgID == 0 {
			reply := tgbotapi.NewMessage(chatID, text)
			reply.ReplyMarkup = &kb
			h.Bot.Send(reply)
		} else {
			edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
			edit.ReplyMarkup = &kb
			h.Bot.Send(edit)
		}
		return
	}

	text += "\n\nEvents:"
	var kbRows [][]tgbotapi.InlineKeyboardButton
	for _, e := range events {
		t := time.Unix(e.OccurredAt, 0).In(loc).Format("15:04")
		label := "IN"
		if e.EventType == "out" {
			label = "OUT"
		}
		wt := ""
		if e.WorkTypeID != nil {
			if wtObj, err := h.DB.GetWorkType(*e.WorkTypeID); err == nil {
				wt = " [" + wtObj.Name + "]"
			}
		}
		note := ""
		if e.Note != "" {
			note = " (" + e.Note + ")"
		}
		text += fmt.Sprintf("\n%s %s%s%s", label, t, wt, note)

		kbRows = append(kbRows, tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData(fmt.Sprintf("Time %s", t), fmt.Sprintf("edit_time_%d", e.ID)),
			tgbotapi.NewInlineKeyboardButtonData("Type", fmt.Sprintf("edit_type_%d", e.ID)),
			tgbotapi.NewInlineKeyboardButtonData("DEL", fmt.Sprintf("delete_%d", e.ID)),
		))
	}

	kbRows = append(kbRows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData("Back to Calendar", "history"),
	))
	kb := tgbotapi.NewInlineKeyboardMarkup(kbRows...)

	if isNewMsg || msgID == 0 {
		reply := tgbotapi.NewMessage(chatID, text)
		reply.ReplyMarkup = &kb
		h.Bot.Send(reply)
	} else {
		edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
		edit.ReplyMarkup = &kb
		h.Bot.Send(edit)
	}
}

func (h *Handler) editEventType(chatID int64, msgID int, user *db.User, eventID int64, loc *time.Location) {
	wts, err := h.DB.GetWorkTypes()
	if err != nil {
		return
	}
	text := "Select new work type:"
	var kbRows [][]tgbotapi.InlineKeyboardButton
	for _, wt := range wts {
		kbRows = append(kbRows, tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData(wt.Name, fmt.Sprintf("settype_%d_%d", eventID, wt.ID)),
		))
	}
	kbRows = append(kbRows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData("Back", fmt.Sprintf("back_day_%d", eventID)),
	))
	kb := tgbotapi.NewInlineKeyboardMarkup(kbRows...)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) setEventWorkType(chatID int64, msgID int, user *db.User, eventID, workTypeID int64, loc *time.Location) {
	h.DB.DB().Exec("UPDATE events SET work_type_id=? WHERE id=?", workTypeID, eventID)
	event, err := h.getEventByID(user.ID, eventID)
	if err != nil {
		return
	}
	t := time.Unix(event.OccurredAt, 0).In(loc)
	date := t.Format("2006-01-02")
	h.sendDayView(chatID, msgID, user, date, loc, false)
}

func (h *Handler) editEventTime(chatID int64, msgID int, user *db.User, eventID int64, loc *time.Location) {
	text := "Select hour:"
	var kbRows [][]tgbotapi.InlineKeyboardButton
	var hourRow []tgbotapi.InlineKeyboardButton
	for hh := 0; hh < 24; hh++ {
		hourRow = append(hourRow, tgbotapi.NewInlineKeyboardButtonData(
			fmt.Sprintf("%02d", hh),
			fmt.Sprintf("edittm_%d_%02d", eventID, hh),
		))
		if len(hourRow) == 6 || hh == 23 {
			kbRows = append(kbRows, hourRow)
			hourRow = nil
		}
	}
	kbRows = append(kbRows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData("Back", fmt.Sprintf("back_day_%d", eventID)),
	))
	kb := tgbotapi.NewInlineKeyboardMarkup(kbRows...)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) editEventTimeMin(chatID int64, msgID int, user *db.User, eventID int64, hh int, loc *time.Location) {
	text := fmt.Sprintf("Select minute for hour %02d:", hh)
	var kbRows [][]tgbotapi.InlineKeyboardButton
	var minRow []tgbotapi.InlineKeyboardButton
	minutes := []int{0, 15, 30, 45}
	for _, mm := range minutes {
		minRow = append(minRow, tgbotapi.NewInlineKeyboardButtonData(
			fmt.Sprintf("%02d", mm),
			fmt.Sprintf("edittm_%d_%02d_%02d", eventID, hh, mm),
		))
	}
	kbRows = append(kbRows, minRow)
	kbRows = append(kbRows, tgbotapi.NewInlineKeyboardRow(
		tgbotapi.NewInlineKeyboardButtonData("Back", fmt.Sprintf("edit_time_%d", eventID)),
	))
	kb := tgbotapi.NewInlineKeyboardMarkup(kbRows...)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) editEventTimeSet(chatID int64, msgID int, user *db.User, eventID int64, hh, mm int, loc *time.Location) {
	event, err := h.getEventByID(user.ID, eventID)
	if err != nil {
		return
	}
	t := time.Unix(event.OccurredAt, 0).In(loc)
	newTime := time.Date(t.Year(), t.Month(), t.Day(), hh, mm, 0, 0, loc)
	date := t.Format("2006-01-02")

	// Check for overlaps with adjacent events
	events, err := h.DB.EventsForDayByDate(user.ID, date)
	if err == nil {
		for _, e := range events {
			if e.ID == eventID {
				continue
			}
			eTime := time.Unix(e.OccurredAt, 0)
			if newTime.Unix() == eTime.Unix() {
				h.acknowledgeCallback(chatID, msgID)
				h.sendDayView(chatID, msgID, user, date, loc, false)
				return
			}
		}
		type eventPos struct {
			id  int64
			typ string
			t   int64
		}
		var sorted []eventPos
		for _, e := range events {
			et := e.OccurredAt
			if e.ID == eventID {
				et = newTime.Unix()
			}
			sorted = append(sorted, eventPos{e.ID, e.EventType, et})
		}
		for i := 0; i < len(sorted); i++ {
			for j := i + 1; j < len(sorted); j++ {
				if sorted[j].t < sorted[i].t || (sorted[j].t == sorted[i].t && sorted[j].id < sorted[i].id) {
					sorted[i], sorted[j] = sorted[j], sorted[i]
				}
			}
		}
		for i := 1; i < len(sorted); i++ {
			if sorted[i].typ == sorted[i-1].typ {
				text := "Edit rejected: overlapping events. Two consecutive events must be different types (in/out)."
				edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
				h.Bot.Send(edit)
				return
			}
		}
	}

	h.DB.DB().Exec("UPDATE events SET occurred_at=? WHERE id=?", newTime.Unix(), eventID)
	h.sendDayView(chatID, msgID, user, date, loc, false)
}

func (h *Handler) acknowledgeCallback(chatID int64, msgID int) {
	h.Bot.Request(tgbotapi.NewCallback(fmt.Sprintf("cb_%d_%d", chatID, msgID), ""))
}

func (h *Handler) deleteEventPrompt(chatID int64, msgID int, user *db.User, eventID int64, loc *time.Location) {
	text := "Delete this event?"
	kbRows := tgbotapi.NewInlineKeyboardMarkup(
		tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData("Yes, DEL", fmt.Sprintf("delconf_%d", eventID)),
			tgbotapi.NewInlineKeyboardButtonData("Cancel", fmt.Sprintf("back_day_%d", eventID)),
		),
	)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	edit.ReplyMarkup = &kbRows
	h.Bot.Send(edit)
}

func (h *Handler) deleteEventConfirm(chatID int64, msgID int, user *db.User, eventID int64, loc *time.Location) {
	event, err := h.getEventByID(user.ID, eventID)
	if err != nil {
		return
	}
	t := time.Unix(event.OccurredAt, 0).In(loc)
	date := t.Format("2006-01-02")

	h.DB.DB().Exec("DELETE FROM events WHERE id=?", eventID)

	// Check if remaining events need repair
	events, err := h.DB.EventsForDayByDate(user.ID, date)
	if err == nil && len(events) > 1 {
		var hasIssue bool
		for i := 1; i < len(events); i++ {
			if events[i].EventType == events[i-1].EventType {
				hasIssue = true
				break
			}
		}
		if hasIssue {
			h.sendText(chatID, "Warning: Timeline has consecutive events of same type after deletion. Timeline requires manual repair.")
		}
	}

	h.sendDayView(chatID, msgID, user, date, loc, false)
}

func (h *Handler) backToDayView(chatID int64, msgID int, user *db.User, eventID int64, loc *time.Location) {
	event, err := h.getEventByID(user.ID, eventID)
	if err != nil {
		return
	}
	t := time.Unix(event.OccurredAt, 0).In(loc)
	date := t.Format("2006-01-02")
	h.sendDayView(chatID, msgID, user, date, loc, false)
}

func (h *Handler) getEventByID(userID, eventID int64) (*db.Event, error) {
	row := h.DB.DB().QueryRow(
		"SELECT id, user_id, day_id, event_type, work_type_id, occurred_at, note, created_at FROM events WHERE id=? AND user_id=?",
		eventID, userID,
	)
	var e db.Event
	var wt sql.NullInt64
	if err := row.Scan(&e.ID, &e.UserID, &e.DayID, &e.EventType, &wt, &e.OccurredAt, &e.Note, &e.CreatedAt); err != nil {
		return nil, err
	}
	if wt.Valid {
		e.WorkTypeID = &wt.Int64
	}
	return &e, nil
}

func (h *Handler) handleExport(msg *tgbotapi.Message) {
	user, err := h.getOrCreateUser(msg.Chat.ID)
	if err != nil {
		h.sendText(msg.Chat.ID, "Error loading profile")
		return
	}
	now := time.Now()
	slog.Info("export", "user_id", user.ID, "year", now.Year(), "month", now.Month())
	data, err := GenerateMonthlyReport(h.DB, user.ID, user.Timezone, user.ExportAccent, user.Calendar, now.Year(), now.Month())
	if err != nil {
		slog.Error("generate report", "error", err)
		h.sendText(msg.Chat.ID, "Error generating report")
		return
	}
	doc := tgbotapi.NewDocument(msg.Chat.ID, tgbotapi.FileBytes{
		Name:  fmt.Sprintf("worktime_%s.xlsx", now.Format("2006_01")),
		Bytes: data,
	})
	if _, err := h.Bot.Send(doc); err != nil {
		slog.Error("send document", "error", err)
		h.sendText(msg.Chat.ID, "Error sending file")
	}
}

func (h *Handler) exportCallback(chatID int64, msgID int, callbackID string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		edit := tgbotapi.NewEditMessageText(chatID, msgID, "Error loading profile")
		kb := backKeyboard()
		edit.ReplyMarkup = &kb
		h.Bot.Send(edit)
		return
	}
	now := time.Now()
	slog.Info("export", "user_id", user.ID, "year", now.Year(), "month", now.Month())
	data, err := GenerateMonthlyReport(h.DB, user.ID, user.Timezone, user.ExportAccent, user.Calendar, now.Year(), now.Month())
	if err != nil {
		slog.Error("generate report", "error", err)
		edit := tgbotapi.NewEditMessageText(chatID, msgID, "Error generating report")
		kb := backKeyboard()
		edit.ReplyMarkup = &kb
		h.Bot.Send(edit)
		return
	}
	slog.Info("report generated", "bytes", len(data))
	edit := tgbotapi.NewEditMessageText(chatID, msgID, "Report ready:")
	kb := backKeyboard()
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
	doc := tgbotapi.NewDocument(chatID, tgbotapi.FileBytes{
		Name:  fmt.Sprintf("worktime_%s.xlsx", now.Format("2006_01")),
		Bytes: data,
	})
	if _, err := h.Bot.Send(doc); err != nil {
		slog.Error("send document", "error", err)
	}
}

func (h *Handler) buildStatusText(chatID int64) string {
	user, day, err := h.getUserToday(chatID)
	if err != nil {
		return "Welcome. Choose an action:"
	}

	text := fmt.Sprintf("Today: %s", formatDateForCalendar(day.Date, user.Calendar))

	if day.IsDayOff {
		text += "\nDay Off"
		return text + "\n\nChoose an action:"
	}

	wt, _ := h.DB.GetWorkType(day.CurrentWorkTypeID)
	if wt != nil {
		text += fmt.Sprintf("\nWork type: %s", wt.Name)
	}

	last, err := h.DB.GetLastEvent(user.ID)
	if err == nil && last != nil && last.EventType == "in" {
		loc, _ := time.LoadLocation(user.Timezone)
		t := time.Unix(last.OccurredAt, 0).In(loc).Format("15:04")
		text += fmt.Sprintf("\nStatus: working since %s", t)
	} else {
		text += "\nStatus: not working"
	}

	events, err := h.DB.EventsForDayByDayID(day.ID)
	if err == nil && len(events) > 0 {
		loc, _ := time.LoadLocation(user.Timezone)
		now := time.Now().In(loc)
		y, m, d := now.Date()
		dayStart := time.Date(y, m, d, 0, 0, 0, 0, loc).Unix()
		dayEnd := now.Unix()
		totals := ComputeDailyTotals(events, day.MinBreakThreshold, dayStart, dayEnd)
		text += fmt.Sprintf("\nToday: %s worked", formatDuration(totals.TotalSeconds))
	}

	text += "\n\nChoose an action:"
	return text
}

func (h *Handler) backToMenu(chatID int64, msgID int, callbackID string) {
	defer h.Bot.Request(tgbotapi.NewCallback(callbackID, ""))
	text := h.buildStatusText(chatID)
	edit := tgbotapi.NewEditMessageText(chatID, msgID, text)
	kb := mainKeyboard()
	edit.ReplyMarkup = &kb
	h.Bot.Send(edit)
}

func (h *Handler) buildDailyReport(user *db.User, day *db.Day, events []db.Event) string {
	loc, err := time.LoadLocation(user.Timezone)
	if err != nil {
		loc = time.UTC
	}

	if len(events) == 0 {
		if day.IsDayOff {
			return fmt.Sprintf("%s - Day Off", formatDateForCalendar(day.Date, user.Calendar))
		}
		return fmt.Sprintf("%s - No events recorded.", formatDateForCalendar(day.Date, user.Calendar))
	}

	y, m, d := parseGregorianDateKey(day.Date)
	dayStart := time.Date(y, time.Month(m), d, 0, 0, 0, 0, loc).Unix()
	dayEnd := time.Date(y, time.Month(m), d, 23, 59, 59, 0, loc).Unix()
	totals := ComputeDailyTotals(events, day.MinBreakThreshold, dayStart, dayEnd)
	lines := fmt.Sprintf("Report for %s", formatDateForCalendar(day.Date, user.Calendar))
	if day.IsDayOff {
		lines += "\nDay Off: Yes"
	}
	lines += "\n\n"

	for _, e := range events {
		t := time.Unix(e.OccurredAt, 0).In(loc).Format("15:04")
		label := "IN"
		if e.EventType == "out" {
			label = "OUT"
		}
		suffix := ""
		if e.WorkTypeID != nil {
			if wtObj, err := h.DB.GetWorkType(*e.WorkTypeID); err == nil {
				suffix = " [" + wtObj.Name + "]"
			}
		}
		if e.Note != "" {
			suffix += " (" + e.Note + ")"
		}
		lines += fmt.Sprintf("%s %s%s\n", label, t, suffix)
	}

	workStr := formatDuration(totals.TotalSeconds)
	breakStr := formatDuration(totals.BreakSeconds)
	lines += fmt.Sprintf("\nSummary:\n  Work: %s\n  Break: %s\n", workStr, breakStr)

	return lines
}

func (h *Handler) SendDailyReport(userID int64, chatID int64) {
	user, err := h.DB.GetUserByChatID(chatID)
	if err != nil {
		slog.Error("daily report: user not found", "user_id", userID)
		return
	}
	loc, err := time.LoadLocation(user.Timezone)
	if err != nil {
		loc = time.UTC
	}
	now := time.Now().In(loc)
	today := now.Format("2006-01-02")

	day, err := h.DB.GetOrCreateDay(user.ID, today)
	if err != nil {
		slog.Error("daily report: get day", "error", err)
		return
	}
	events, err := h.DB.EventsForDayByDayID(day.ID)
	if err != nil {
		slog.Error("daily report: get events", "error", err)
		return
	}
	text := h.buildDailyReport(user, day, events)
	reply := tgbotapi.NewMessage(chatID, text)
	h.Bot.Send(reply)
	h.DB.MarkReportSent(user.ID, today)
}

func mainKeyboard() tgbotapi.InlineKeyboardMarkup {
	return tgbotapi.NewInlineKeyboardMarkup(
		tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData("Clock In", "clockin"),
			tgbotapi.NewInlineKeyboardButtonData("Clock Out", "clockout"),
		),
		tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData("Work Type", "worktype"),
			tgbotapi.NewInlineKeyboardButtonData("Day Off", "dayoff"),
		),
		tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData("Report", "report"),
			tgbotapi.NewInlineKeyboardButtonData("Export", "export"),
		),
		tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData("Settings", "settings"),
		),
	)
}

func backKeyboard() tgbotapi.InlineKeyboardMarkup {
	return tgbotapi.NewInlineKeyboardMarkup(
		tgbotapi.NewInlineKeyboardRow(
			tgbotapi.NewInlineKeyboardButtonData("Back to Menu", "back_menu"),
		),
	)
}

func formatDuration(seconds int64) string {
	hours := seconds / 3600
	mins := (seconds % 3600) / 60
	if hours > 0 {
		return fmt.Sprintf("%dh %dm", hours, mins)
	}
	return fmt.Sprintf("%dm", mins)
}

func (h *Handler) sendText(chatID int64, text string) {
	h.Bot.Send(tgbotapi.NewMessage(chatID, text))
}