"""
点名相关API路由
"""
from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from datetime import datetime
from backend.database import get_db
from backend.models import Student, RollCallRecord, ScoreRecord
from backend.schemas import (
    RollCallRequest, RollCallResult, RollCallRecordCreate,
    RollCallRecordResponse
)
from backend.utils.probability import get_random_student, get_next_order_student
from backend.utils.events import trigger_random_event
from typing import Optional, List

router = APIRouter(prefix="/api/rollcall", tags=["rollcall"])

# 存储当前顺序点名的学生ID（简单实现，生产环境应使用Redis等）
current_order_student_id: Optional[int] = None

@router.post("/start", response_model=RollCallResult)
def start_rollcall(request: RollCallRequest, db: Session = Depends(get_db)):
    """开始点名"""
    global current_order_student_id
    
    try:
        if request.rollcall_type == "random":
            # 随机点名
            student = get_random_student(db)
            student.random_rollcall_count += 1
        elif request.rollcall_type == "order":
            # 顺序点名
            student = get_next_order_student(db, current_order_student_id)
            current_order_student_id = student.id
            student.order_rollcall_count += 1
        else:
            raise HTTPException(status_code=400, detail="无效的点名类型")
        
        db.commit()
        
        return RollCallResult(
            student_id=student.id,
            student_code=student.student_id,
            name=student.name,
            major=student.major,
            total_score=student.total_score,
            random_rollcall_count=student.random_rollcall_count
        )
    
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))
    except Exception as e:
        db.rollback()
        raise HTTPException(status_code=500, detail=f"点名失败: {str(e)}")

@router.post("/record", response_model=RollCallRecordResponse)
def record_rollcall(record: RollCallRecordCreate, db: Session = Depends(get_db)):
    """记录点名结果并更新积分"""
    student = db.query(Student).filter(Student.id == record.student_id).first()
    if not student:
        raise HTTPException(status_code=404, detail="学生不存在")
    
    # 触发随机事件
    event = trigger_random_event()
    event_multiplier = event["multiplier"]
    
    # 计算积分变化
    attendance_score = 1.0 if record.is_present else 0.0
    question_repeat_score = record.question_repeat_score  # -1, 0, 0.5
    answer_score: float = record.answer_score  # 0-3
    
    # 应用事件倍数
    total_score_change = (
        (attendance_score + question_repeat_score + answer_score) * event_multiplier
    )
    
    # 更新学生积分
    student.total_score += total_score_change
    # 检查转移权（被点名两次后获得一次转移权）
    total_rollcall_count = student.random_rollcall_count + student.order_rollcall_count
    if total_rollcall_count % 2 == 0 and total_rollcall_count > 0:
        student.transfer_right_count += 1
    
    # 创建点名记录
    rollcall_record = RollCallRecord(
        student_id=record.student_id,
        rollcall_type=record.rollcall_type,
        is_present=record.is_present,
        question_repeat_score=question_repeat_score,
        answer_score=answer_score,
        attendance_score=attendance_score,
        total_score_change=total_score_change,
        event_type=event["type"]
    )
    db.add(rollcall_record)
    
    # 创建积分记录
    score_record = ScoreRecord(
        student_id=record.student_id,
        score_change=total_score_change,
        reason=f"点名记录: {event['name']}"
    )
    db.add(score_record)
    
    db.commit()
    db.refresh(rollcall_record)
    tmp = RollCallRecordResponse(
        id=rollcall_record.id,
        student_id=student.id,
        student_code=student.student_id,
        student_name=student.name,
        rollcall_type=rollcall_record.rollcall_type,
        is_present=rollcall_record.is_present,
        total_score_change=rollcall_record.total_score_change,
        created_at=rollcall_record.created_at
    )
    print(tmp.model_dump_json())
    return RollCallRecordResponse(
        id=rollcall_record.id,
        student_id=student.id,
        student_code=student.student_id,
        student_name=student.name,
        rollcall_type=rollcall_record.rollcall_type,
        is_present=rollcall_record.is_present,
        total_score_change=rollcall_record.total_score_change,
        created_at=rollcall_record.created_at
    )

@router.get("/records", response_model=List[RollCallRecordResponse])
def get_rollcall_records(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
    """获取点名记录列表"""
    records = (
        db.query(RollCallRecord)
        .join(Student)
        .offset(skip)
        .limit(limit)
        .order_by(RollCallRecord.created_at.desc())
        .all()
    )
    
    result = []
    for record in records:
        result.append(RollCallRecordResponse(
            id=record.id,
            student_id=record.student_id,
            student_code=record.student.student_id,
            student_name=record.student.name,
            rollcall_type=record.rollcall_type,
            is_present=record.is_present,
            total_score_change=record.total_score_change,
            created_at=record.created_at
        ))
    
    return result

@router.post("/transfer")
def transfer_rollcall(request_data: dict, db: Session = Depends(get_db)):
    """转移点名（使用转移权）"""
    from_student_id = request_data.get("from_student_id")
    to_student_id = request_data.get("to_student_id")
    
    if not from_student_id or not to_student_id:
        raise HTTPException(status_code=400, detail="缺少必要参数")
    
    from_student = db.query(Student).filter(Student.id == from_student_id).first()
    to_student = db.query(Student).filter(Student.id == to_student_id).first()
    
    if not from_student or not to_student:
        raise HTTPException(status_code=404, detail="学生不存在")
    
    if from_student.transfer_right_count <= 0:
        raise HTTPException(status_code=400, detail="没有可用的转移权")
    
    # 使用转移权
    from_student.transfer_right_count -= 1
    
    db.commit()
    
    return {
        "message": "转移成功",
        "from_student": from_student.name,
        "to_student": to_student.name,
        "remaining_transfer_rights": from_student.transfer_right_count
    }