# ===========================================
# 班级操行分管理系统 - 后端服务
# 
# 开发者: Canglan
# 联系方式: admin@sea-studio.top
# 版权归属: Sea Network Technology Studio
# 许可证: MIT License
# 
# 版权所有 © Sea Network Technology Studio
# ===========================================

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

from models.student import StudentModel
from models.conduct import ConductModel
from models.homework import HomeworkModel
from models.attendance import AttendanceModel
from middleware.permission import PermissionChecker
from utils.logger import get_logger

logger = get_logger(__name__)


class StudentService:
    """学生服务"""
    
    @staticmethod
    async def get_conduct_history(
        student_id: int,
        limit: int = 50,
        offset: int = 0
    ) -> Dict[str, Any]:
        """获取学生操行分历史（学生端显示，扣分项操作人显示为班主任）"""
        student = await StudentModel.get_by_id(student_id)
        if not student:
            return {"error": "学生不存在"}
        
        records = await ConductModel.get_student_records(
            student_id=student_id,
            limit=limit,
            offset=offset
        )
        
        # 处理记录：扣分项的操作人统一显示为"班主任"
        for record in records:
            if record["points_change"] < 0:  # 扣分项
                record["recorder_name"] = "班主任"
            # 加分项保持原操作人不变
        
        return {
            "student_id": student_id,
            "student_name": student["name"],
            "total_points": student["total_points"],
            "records": records
        }
    
    @staticmethod
    async def get_homework_status(student_id: int) -> Dict[str, Any]:
        """获取学生作业情况"""
        student = await StudentModel.get_by_id(student_id)
        if not student:
            return {"error": "学生不存在"}
        
        homework = await HomeworkModel.get_student_homework(student_id)
        
        # 统计
        total = len(homework)
        submitted = sum(1 for h in homework if h["status"] == "submitted")
        not_submitted = sum(1 for h in homework if h["status"] == "not_submitted")
        late = sum(1 for h in homework if h["status"] == "late")
        
        return {
            "student_id": student_id,
            "student_name": student["name"],
            "statistics": {
                "total": total,
                "submitted": submitted,
                "not_submitted": not_submitted,
                "late": late
            },
            "homework": homework
        }
    
    @staticmethod
    async def get_attendance_records(
        student_id: int,
        month: Optional[str] = None
    ) -> Dict[str, Any]:
        """获取学生考勤记录"""
        student = await StudentModel.get_by_id(student_id)
        if not student:
            return {"error": "学生不存在"}
        
        records = await AttendanceModel.get_student_records(
            student_id=student_id,
            month=month
        )
        
        # 统计
        present = sum(1 for r in records if r["status"] == "present")
        absent = sum(1 for r in records if r["status"] == "absent")
        late = sum(1 for r in records if r["status"] == "late")
        leave = sum(1 for r in records if r["status"] == "leave")
        
        return {
            "student_id": student_id,
            "student_name": student["name"],
            "statistics": {
                "present": present,
                "absent": absent,
                "late": late,
                "leave": leave,
                "total": len(records)
            },
            "records": records
        }
    
    @staticmethod
    async def get_ranking(
        user_id: int,
        class_id: Optional[int] = None,
        limit: int = 50
    ) -> Dict[str, Any]:
        """获取排行榜"""
        # 如果未指定班级，获取用户所在班级
        if not class_id:
            user = await StudentModel.get_by_id(user_id) if user_id else None
            if user:
                class_id = user["class_id"]
            else:
                admin_class = await PermissionChecker.get_user_class_id(user_id)
                if admin_class:
                    class_id = admin_class
        
        ranking = await StudentModel.get_ranking(class_id=class_id, limit=limit)
        
        return {
            "class_id": class_id,
            "ranking": ranking
        }
    
    @staticmethod
    async def get_student_info(student_id: int) -> Optional[Dict[str, Any]]:
        """获取学生个人信息"""
        return await StudentModel.get_by_id(student_id)