from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session
from sqlalchemy import and_
from pydantic import BaseModel, Field
from typing import Optional
import uuid
import random
import re
from datetime import datetime, timedelta

from ..database import get_db
from ..models import (
    User, LoginLog, RegisterSetting, SmsConfig, SmsVerificationCode,
    gen_uuid
)
from ..auth import get_current_user, hash_password, verify_password, create_access_token
from ..middleware.log_service import LogService
from ..sms_client import send_sms_code

router = APIRouter()


class LoginRequest(BaseModel):
    username: str
    password: str


class RegisterRequest(BaseModel):
    username: str = Field(min_length=3, max_length=50)
    password: str = Field(min_length=6, max_length=100)
    email: Optional[str] = None
    phone: Optional[str] = None
    sms_code: Optional[str] = None


class SendCodeRequest(BaseModel):
    phone: str
    purpose: str = "register"  # register / reset_password


class ResetPasswordRequest(BaseModel):
    phone: str
    code: str
    new_password: str = Field(min_length=6, max_length=100)


@router.post("/login")
def login(req: LoginRequest, db: Session = Depends(get_db)):
    import logging
    logger = logging.getLogger(__name__)

    user = db.query(User).filter(User.username == req.username).first()
    if not user:
        logger.warning(f"登录失败: 用户 '{req.username}' 不存在")
        raise HTTPException(status_code=401, detail="用户名不存在")

    stored_hash = user.password_hash
    logger.info(f"登录调试: username={req.username} hash_prefix={stored_hash[:7] if stored_hash else 'None'} hash_len={len(stored_hash) if stored_hash else 0}")

    if not verify_password(req.password, user.password_hash):
        logger.warning(f"登录失败: 用户 '{req.username}' 密码验证失败 hash_prefix={stored_hash[:7] if stored_hash else 'None'} hash_len={len(stored_hash) if stored_hash else 0}")
        raise HTTPException(status_code=401, detail="密码错误")
    if user.status == "banned":
        raise HTTPException(status_code=403, detail="账号已被封禁")

    token_data = {"sub": user.id, "username": user.username, "role": user.role}
    access_token = create_access_token(token_data)

    # 记录登录日志
    login_log = LoginLog(
        id=gen_uuid(),
        user_id=user.id,
        ip="",
        login_at=datetime.now(),
    )
    db.add(login_log)

    # 记录操作日志
    LogService.log_operation(
        user_id=user.id,
        username=user.username,
        action="login",
        target="user",
        detail=f"用户 {user.username} 登录成功",
    )

    db.commit()

    return {
        "code": 0,
        "data": {
            "access_token": access_token,
            "token_type": "bearer",
            "user": {
                "id": user.id,
                "username": user.username,
                "email": user.email,
                "phone": user.phone,
                "avatar": user.avatar,
                "role": user.role,
                "status": user.status,
                "membership_level": user.membership_level,
                "membership_expire_at": str(user.membership_expire_at) if user.membership_expire_at else None,
                "created_at": str(user.created_at) if user.created_at else None,
            },
        },
        "message": "登录成功",
    }


@router.post("/register")
def register(req: RegisterRequest, db: Session = Depends(get_db)):
    # 检查注册设置
    reg_setting = db.query(RegisterSetting).first()
    if reg_setting and reg_setting.phone_required and not req.phone:
        raise HTTPException(status_code=400, detail="手机号为必填项")
    if reg_setting and reg_setting.email_required and not req.email:
        raise HTTPException(status_code=400, detail="邮箱为必填项")

    # 检查用户名是否已存在
    existing = db.query(User).filter(User.username == req.username).first()
    if existing:
        raise HTTPException(status_code=400, detail="用户名已存在")

    if req.email:
        existing_email = db.query(User).filter(User.email == req.email).first()
        if existing_email:
            raise HTTPException(status_code=400, detail="邮箱已被注册")

    if req.phone:
        existing_phone = db.query(User).filter(User.phone == req.phone).first()
        if existing_phone:
            raise HTTPException(status_code=400, detail="手机号已被注册")

    # 短信验证码校验（手机号注册且开启短信验证）
    if req.phone and reg_setting and reg_setting.phone_sms_required:
        if not req.sms_code:
            raise HTTPException(status_code=400, detail="请先获取并填写短信验证码")
        vrec = db.query(SmsVerificationCode).filter(
            SmsVerificationCode.phone == req.phone,
            SmsVerificationCode.purpose == "register",
            SmsVerificationCode.used == False,
            SmsVerificationCode.expires_at > datetime.now(),
        ).order_by(SmsVerificationCode.created_at.desc()).first()
        if not vrec or vrec.code != req.sms_code:
            raise HTTPException(status_code=400, detail="短信验证码错误或已过期")
        vrec.used = True

    user = User(
        id=gen_uuid(),
        username=req.username,
        password_hash=hash_password(req.password),
        email=req.email,
        phone=req.phone,
        avatar=None,
        role="user",
        status="active",
        real_name_status="unverified",
        membership_level=0,
        created_at=datetime.now(),
        updated_at=datetime.now(),
    )
    db.add(user)
    db.flush()

    # 创建Token余额记录
    from ..models import TokenBalance
    balance = TokenBalance(
        id=gen_uuid(),
        user_id=user.id,
        total_consumed=0,
        balance=0,
        daily_free_used=0,
    )
    db.add(balance)

    token_data = {"sub": user.id, "username": user.username, "role": user.role}
    access_token = create_access_token(token_data)

    LogService.log_operation(
        user_id=user.id,
        username=user.username,
        action="register",
        target="user",
        detail=f"新用户 {user.username} 注册成功",
    )

    db.commit()

    return {
        "code": 0,
        "data": {
            "access_token": access_token,
            "token_type": "bearer",
            "user": {
                "id": user.id,
                "username": user.username,
                "email": user.email or "",
                "phone": user.phone or "",
                "avatar": user.avatar or "",
                "role": user.role,
                "status": user.status,
                "membership_level": user.membership_level,
                "created_at": str(user.created_at) if user.created_at else None,
            },
        },
        "message": "注册成功",
    }


@router.post("/send-code")
def send_code(req: SendCodeRequest, db: Session = Depends(get_db)):
    """发送短信验证码（注册 / 重置密码）。公开接口。"""
    if not re.match(r'^1[3-9]\d{9}$', req.phone or ''):
        raise HTTPException(status_code=400, detail="手机号格式不正确")
    purpose = req.purpose or "register"
    if purpose not in ("register", "reset_password"):
        raise HTTPException(status_code=400, detail="不支持的验证码类型")

    config = db.query(SmsConfig).first()
    if not config or not config.provider:
        raise HTTPException(status_code=400, detail="短信服务未配置，请联系管理员")

    # 注册场景：手机号已注册则直接提示，避免浪费短信
    if purpose == "register":
        existing = db.query(User).filter(User.phone == req.phone).first()
        if existing:
            raise HTTPException(status_code=400, detail="该手机号已注册，请直接登录")

    # 频率限制：同一手机号+用途 60 秒内不重复下发
    recent = db.query(SmsVerificationCode).filter(
        SmsVerificationCode.phone == req.phone,
        SmsVerificationCode.purpose == purpose,
        SmsVerificationCode.used == False,
        SmsVerificationCode.expires_at > datetime.now(),
    ).order_by(SmsVerificationCode.created_at.desc()).first()
    if recent:
        age = (datetime.now() - recent.created_at).total_seconds()
        if age < 60:
            raise HTTPException(status_code=429, detail=f"验证码发送过于频繁，请{int(60 - age)}秒后再试")

    code = f"{random.randint(100000, 999999)}"
    rec = SmsVerificationCode(
        id=gen_uuid(),
        phone=req.phone,
        code=code,
        purpose=purpose,
        expires_at=datetime.now() + timedelta(minutes=5),
        used=False,
    )
    db.add(rec)
    db.commit()

    ok, msg, _ = send_sms_code(config, req.phone, code, purpose)
    if not ok:
        raise HTTPException(status_code=400, detail=f"短信发送失败：{msg}")

    return {"code": 0, "data": {"sent": True}, "message": "验证码已发送"}


@router.post("/reset-password")
def reset_password(req: ResetPasswordRequest, db: Session = Depends(get_db)):
    """通过短信验证码重置密码（公开接口）。"""
    user = db.query(User).filter(User.phone == req.phone).first()
    if not user:
        raise HTTPException(status_code=400, detail="该手机号未注册")

    vrec = db.query(SmsVerificationCode).filter(
        SmsVerificationCode.phone == req.phone,
        SmsVerificationCode.purpose == "reset_password",
        SmsVerificationCode.used == False,
        SmsVerificationCode.expires_at > datetime.now(),
    ).order_by(SmsVerificationCode.created_at.desc()).first()
    if not vrec or vrec.code != req.code:
        raise HTTPException(status_code=400, detail="验证码错误或已过期")

    user.password_hash = hash_password(req.new_password)
    user.updated_at = datetime.now()
    vrec.used = True

    LogService.log_operation(
        user_id=user.id,
        username=user.username,
        action="reset_password",
        target="user",
        detail=f"用户 {user.username} 通过短信验证码重置了密码",
    )
    db.commit()

    return {"code": 0, "message": "密码重置成功"}


@router.get("/me")
def get_me(current_user: User = Depends(get_current_user)):
    return {
        "code": 0,
        "data": {
            "id": current_user.id,
            "username": current_user.username,
            "email": current_user.email or "",
            "phone": current_user.phone or "",
            "avatar": current_user.avatar or "",
            "role": current_user.role,
            "status": current_user.status,
            "real_name_status": current_user.real_name_status,
            "membership_level": current_user.membership_level,
            "membership_expire_at": str(current_user.membership_expire_at) if current_user.membership_expire_at else None,
            "auto_renew": current_user.auto_renew,
            "created_at": str(current_user.created_at) if current_user.created_at else None,
        },
        "message": "ok",
    }


@router.post("/logout")
def logout(current_user: User = Depends(get_current_user)):
    LogService.log_operation(
        user_id=current_user.id,
        username=current_user.username,
        action="logout",
        target="user",
        detail=f"用户 {current_user.username} 登出",
    )
    return {"code": 0, "message": "登出成功"}


@router.get("/settings")
def get_settings(db: Session = Depends(get_db)):
    settings = db.query(RegisterSetting).first()
    if not settings:
        return {"code": 0, "data": {}, "message": "ok"}
    return {
        "code": 0,
        "data": {
            "phone_required": settings.phone_required,
            "phone_sms_required": settings.phone_sms_required,
            "email_required": settings.email_required,
            "email_verify_required": settings.email_verify_required,
            "real_name_required": settings.real_name_required,
        },
        "message": "ok",
    }