import datetime
from typing import Optional, Dict, Any, List

def is_weekend(date: datetime.date) -> bool:
    """判断是否为周末"""
    return date.weekday() >= 5  # 周六=5, 周日=6

def is_holiday(date: datetime.date, holidays: list = None) -> Dict[str, Any]:
    """检测指定日期是否为休息日"""
    day_of_week = date.weekday()  # 0=周一, 6=周日
    is_weekend_day = day_of_week >= 5  # 周六、周日
    
    # 检查是否为配置的节假日
    configured_holiday = None
    if holidays:
        for holiday in holidays:
            if holiday.date == date:
                configured_holiday = holiday
                break
    
    is_configured_holiday = configured_holiday is not None
    
    return {
        'is_holiday': is_weekend_day or is_configured_holiday,
        'holiday_type': 'weekend' if is_weekend_day else (configured_holiday.holiday_type if configured_holiday else None),
        'holiday_name': configured_holiday.holiday_name if configured_holiday else None,
        'is_working_day': configured_holiday.is_working_day if configured_holiday else False
    }

def calculate_hours(start_time: Optional[str], end_time: Optional[str], is_holiday_flag: bool = False) -> str:
    """工时计算函数"""
    if not start_time or not end_time or start_time == '-' or end_time == '-':
        return '0:00' if is_holiday_flag else '-'  # 休息日默认显示0:00而不是-
    
    try:
        start = datetime.datetime.strptime(start_time, '%H:%M')
        end = datetime.datetime.strptime(end_time, '%H:%M')
        
        # 处理跨日情况
        if end < start:
            end += datetime.timedelta(days=1)
        
        diff = end - start
        total_minutes = int(diff.total_seconds() / 60)
        
        hours = total_minutes // 60
        minutes = total_minutes % 60
        
        return f"{hours}:{minutes:02d}"
    except ValueError:
        return '0:00'

def format_hours_to_decimal(hours: str) -> float:
    """工时格式转换函数：将"2:42"格式转换为小数格式用于计算"""
    if hours == '-' or not hours:
        return 0.0
    
    if ':' in hours:
        try:
            parts = hours.split(':')
            h = int(parts[0])
            m = int(parts[1]) if len(parts) > 1 else 0
            return h + (m / 60)
        except ValueError:
            return 0.0
    
    try:
        return float(hours)
    except ValueError:
        return 0.0

def format_decimal_to_hours(decimal_hours: float) -> str:
    """将小数工时转换回"HH:MM"格式"""
    hours = int(decimal_hours)
    minutes = int((decimal_hours - hours) * 60)
    return f"{hours}:{minutes:02d}"

def calculate_weekly_hours(records: list) -> Dict[str, float]:
    """工时统计函数（区分工作日和休息日）"""
    workday_hours = sum([
        format_hours_to_decimal(r.get('hours', '0:00')) 
        for r in records 
        if not r.get('is_holiday', False) and r.get('hours') not in ['-', '0:00', None]
    ])
    
    holiday_hours = sum([
        format_hours_to_decimal(r.get('hours', '0:00')) 
        for r in records 
        if r.get('is_holiday', False) and r.get('hours') not in ['-', '0:00', None]
    ])
    
    return {
        'workday_hours': workday_hours,
        'holiday_hours': holiday_hours,
        'total_hours': workday_hours + holiday_hours
    }

def get_week_info(date: datetime.date) -> str:
    """获取周信息，如"51周/53周" """
    year = date.year
    week_num = date.isocalendar()[1]
    
    # 计算该年总共有多少周
    last_day = datetime.date(year, 12, 31)
    total_weeks = last_day.isocalendar()[1]
    
    return f"{week_num}周/{total_weeks}周"

def get_day_of_week_chinese(date: datetime.date) -> str:
    """获取中文星期"""
    weekdays = ['周一', '周二', '周三', '周四', '周五', '周六', '周日']
    return weekdays[date.weekday()]