"""
알림 시스템
퇴근 시간 알림, 점심시간 알림 등
"""
from datetime import datetime, timedelta
from typing import Optional
from PyQt5.QtCore import QTimer, QObject, pyqtSignal

from core.settings_keys import (
    NOTIF_CLOCK_OUT, NOTIF_LUNCH, NOTIF_DINNER, NOTIF_OVERTIME, NOTIF_HEALTH,
    LUNCH_REMINDER_HOURS, DINNER_REMINDER_HOURS,
    OVERTIME_THRESHOLD_HOURS, WEEKLY_HOURS_THRESHOLD, HEALTH_CONSECUTIVE_OT_DAYS,
    OVERTIME_UNIT,
)
from core.i18n import tr


def _get_int_setting(db, key: str, default: int, lo: int, hi: int) -> int:
    """db에서 정수 설정값을 안전하게 읽어 [lo, hi]로 클램프."""
    if db is None:
        return default
    try:
        v = int(db.get_setting(key, str(default)) or default)
    except (ValueError, TypeError):
        v = default
    return max(lo, min(hi, v))


class Notifier(QObject):
    """알림 시스템 클래스"""

    notification_signal = pyqtSignal(str, str)  # (제목, 메시지)

    def __init__(self, parent=None, db=None):
        super().__init__(parent)
        self.db = db  # 설정 키 가드용 (None이면 모든 알림 활성)
        self.timer = QTimer()
        self.timer.timeout.connect(self.check_notifications)
        self.timer.start(60000)  # 1분마다 체크

        # 알림 상태 추적
        self.notified_30min = False
        self.notified_lunch = False
        self.notified_dinner = False
        self.notified_overtime = False
        self.notified_health = False
        self.notified_weekly = False
        self.notified_threshold = False

        self.last_check_date = datetime.now().date()

    def _enabled(self, key: str) -> bool:
        """설정에서 해당 알림이 켜져 있는지. db 없으면 기본 켜짐."""
        if self.db is None:
            return True
        val = self.db.get_setting(key, 'true')
        return str(val).lower() in ('1', 'true', 'yes')

    def check_notifications(self):
        """알림 체크"""
        now = datetime.now()
        current_date = now.date()

        # 날짜가 바뀌면 알림 상태 리셋
        if current_date != self.last_check_date:
            self.reset_notifications()
            self.last_check_date = current_date

    def check_clock_out_soon(self, clock_out_time: datetime, current_time: Optional[datetime] = None):
        """
        퇴근 30분 전 알림
        Args:
            clock_out_time: 예상 퇴근 시간
            current_time: 현재 시간 (None이면 지금)
        """
        if current_time is None:
            current_time = datetime.now()

        if not self._enabled(NOTIF_CLOCK_OUT):
            return
        time_diff = clock_out_time - current_time

        # 사용자 설정 N분 이내 알림 (기본 30, 설정에서 1~120 범위)
        threshold_min = 30
        if self.db is not None:
            try:
                threshold_min = int(self.db.get_setting('notification_before_minutes', '30') or '30')
                threshold_min = max(1, min(120, threshold_min))
            except (ValueError, TypeError):
                threshold_min = 30
        threshold_sec = threshold_min * 60

        if 0 < time_diff.total_seconds() <= threshold_sec and not self.notified_30min:
            minutes_left = int(time_diff.total_seconds() / 60)
            self.notification_signal.emit(
                tr('notif.clock_out_soon.title'),
                tr('notif.clock_out_soon.body', minutes=minutes_left),
            )
            self.notified_30min = True

    def check_lunch_reminder(self, clock_in_time: datetime, lunch_enabled: bool,
                            current_time: Optional[datetime] = None):
        """점심시간 등록 알림. 출근 후 LUNCH_REMINDER_HOURS 경과 시."""
        if current_time is None:
            current_time = datetime.now()
        if not self._enabled(NOTIF_LUNCH):
            return
        if lunch_enabled or self.notified_lunch:
            return

        threshold_hours = _get_int_setting(self.db, LUNCH_REMINDER_HOURS, 4, 1, 12)
        if (current_time - clock_in_time).total_seconds() >= threshold_hours * 3600:
            self.notification_signal.emit(
                tr('notif.lunch_reminder.title'),
                tr('notif.lunch_reminder.body'),
            )
            self.notified_lunch = True

    def check_dinner_reminder(self, clock_in_time: datetime, dinner_enabled: bool,
                               current_time: Optional[datetime] = None):
        """저녁시간 등록 알림. 출근 후 DINNER_REMINDER_HOURS 경과 시.

        야근(연장근무) 사용자가 저녁을 깜빡 잊는 패턴 대응.
        """
        if current_time is None:
            current_time = datetime.now()
        if not self._enabled(NOTIF_DINNER):
            return
        if dinner_enabled or self.notified_dinner:
            return

        threshold_hours = _get_int_setting(self.db, DINNER_REMINDER_HOURS, 8, 1, 16)
        if (current_time - clock_in_time).total_seconds() >= threshold_hours * 3600:
            self.notification_signal.emit(
                tr('notif.dinner_reminder.title'),
                tr('notif.dinner_reminder.body'),
            )
            self.notified_dinner = True

    def check_overtime_earning(self, overtime_minutes: int):
        """연장근무 적립 알림. OVERTIME_UNIT 이상 적립 예정 시 한 번."""
        if not self._enabled(NOTIF_OVERTIME):
            return
        # overtime_unit 설정값을 임계로 사용 (15/30/60 — 사용자가 선택한 단위)
        unit = _get_int_setting(self.db, OVERTIME_UNIT, 30, 1, 240)
        if overtime_minutes >= unit and not self.notified_overtime:
            from utils.time_format import format_hours_minutes
            time_str = format_hours_minutes(overtime_minutes, omit_zero_minutes=True)
            self.notification_signal.emit(
                tr('notif.overtime_earning.title'),
                tr('notif.overtime_earning.body', time_str=time_str),
            )
            self.notified_overtime = True

    def notify_overtime_threshold(self, total_overtime_hours: float):
        """연장근무 누적 알림 (OVERTIME_THRESHOLD_HOURS 이상)"""
        if not self._enabled(NOTIF_OVERTIME):
            return
        threshold = _get_int_setting(self.db, OVERTIME_THRESHOLD_HOURS, 20, 1, 200)
        if total_overtime_hours >= threshold and not self.notified_threshold:
            self.notification_signal.emit(
                tr('notif.overtime_threshold.title'),
                tr('notif.overtime_threshold.body', hours=total_overtime_hours),
            )
            self.notified_threshold = True

    def notify_health_warning(self, consecutive_overtime_days: int):
        """건강 경고 (연속 연장근무 HEALTH_CONSECUTIVE_OT_DAYS일 이상)"""
        if not self._enabled(NOTIF_HEALTH):
            return
        threshold = _get_int_setting(self.db, HEALTH_CONSECUTIVE_OT_DAYS, 3, 1, 14)
        if consecutive_overtime_days >= threshold and not self.notified_health:
            self.notification_signal.emit(
                tr('notif.health.title'),
                tr('notif.health.body', days=consecutive_overtime_days),
            )
            self.notified_health = True

    def notify_weekly_hours(self, total_hours: float):
        """주 X시간 경고 (WEEKLY_HOURS_THRESHOLD)"""
        if not self._enabled(NOTIF_HEALTH):
            return
        threshold = _get_int_setting(self.db, WEEKLY_HOURS_THRESHOLD, 52, 20, 168)
        if total_hours > threshold and not self.notified_weekly:
            self.notification_signal.emit(
                tr('notif.weekly_52.title'),
                tr('notif.weekly_52.body', hours=total_hours),
            )
            self.notified_weekly = True

    def check_health_break(self, clock_in_time, break_minutes: int, current_time=None):
        """장시간 연속 근무 휴식 알림.

        조건: HEALTH_BREAK_ENABLED=true, (출근 경과 - 외출시간) >= HEALTH_BREAK_HOURS,
        오늘 미발송. 5분 throttle은 호출자(NotificationOrchestrator)에서.
        """
        if current_time is None:
            current_time = datetime.now()
        if self.db is None:
            return
        if not self._enabled('health_break_enabled'):
            return
        if self.db.has_notification_today('system', 'health_break'):
            return
        threshold_hours = _get_int_setting(self.db, 'health_break_hours', 4, 1, 12)
        elapsed_sec = (current_time - clock_in_time).total_seconds() - break_minutes * 60
        if elapsed_sec >= threshold_hours * 3600:
            self.notification_signal.emit(
                tr('notif.health_break.title'),
                tr('notif.health_break.body', hours=threshold_hours),
            )
            self.db.log_notification('system', 'health_break')

    def reset_notifications(self):
        """알림 상태 리셋 (날짜 변경 시)"""
        self.notified_30min = False
        self.notified_lunch = False
        self.notified_dinner = False
        self.notified_overtime = False
        self.notified_health = False
        self.notified_weekly = False
        self.notified_threshold = False


# 테스트 코드
if __name__ == "__main__":
    from PyQt5.QtWidgets import QApplication, QMessageBox
    import sys

    app = QApplication(sys.argv)

    notifier = Notifier()

    # 시그널 연결 (테스트)
    def show_notification(title, message):
        QMessageBox.information(None, title, message)

    notifier.notification_signal.connect(show_notification)

    # 테스트: 퇴근 30분 전
    clock_out = datetime.now() + timedelta(minutes=25)
    notifier.check_clock_out_soon(clock_out)

    print("Notifier test completed")
