package bot

import (
	"database/sql"
	"errors"
	"fmt"
	"time"
)

// clockIn records a clock-in event for today.
// Returns the formatted time or an error if already clocked in today.
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 := loadLocation(user.Timezone)
		now := time.Now().In(loc)
		lastTime := time.Unix(last.OccurredAt, 0).In(loc)
		if lastTime.Format(DateLayout) == now.Format(DateLayout) {
			return "", errors.New("already clocked in")
		}
	}

	loc := 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(TimeLayout)), nil
}

// clockOut records a clock-out event for today.
// Returns the formatted time or an error if not clocked in.
// Also awards XP and updates streaks if RPG is enabled.
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 := 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
	}
	text := fmt.Sprintf("clocked out at %s", now.Format(TimeLayout))

	// Award XP and update streaks if RPG enabled
	st, _ := h.DB.GetOrCreateSettings(user.ID)
	if st.RPGEnabled {
		sessionWork := now.Unix() - last.OccurredAt
		today := now.Format(DateLayout)
		isWeekend := now.Weekday() == time.Saturday || now.Weekday() == time.Sunday

		streak, _ := h.updateStreak(user.ID, today, true)
		xp, leveledUp, newLevel, _ := h.computeAndAwardXP(user.ID, sessionWork, streak, today)
		stats, _ := h.DB.GetOrCreateRPGStats(user.ID)
		totalHours := float64(h.totalWorkSeconds(user.ID, loc)) / secondsPerHour
		unlocked := h.checkAchievements(user.ID, stats, sessionWork, today, isWeekend, totalHours)

		text += fmt.Sprintf("\n\n+%d XP (Lv.%d)", xp, newLevel)
		if leveledUp {
			text += "\nLevel up!"
		}
		for _, a := range unlocked {
			text += fmt.Sprintf("\nAchievement: %s", a)
		}
	}

	return text, nil
}

// dayOff toggles today as a day off.
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
}

// report returns today's work summary via buildDailyReport.
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
}

// toggleReport enables or disables the automatic daily report.
func (h *Handler) toggleReport(chatID int64) (string, error) {
	user, err := h.getOrCreateUser(chatID)
	if err != nil {
		return "", err
	}
	st, err := h.DB.GetOrCreateSettings(user.ID)
	if err != nil {
		return "", err
	}
	st.ReportEnabled = !st.ReportEnabled
	if err := h.DB.UpdateSettings(st); err != nil {
		return "", err
	}
	if st.ReportEnabled {
		return "daily report enabled", nil
	}
	return "daily report disabled", nil
}