from apiflask import APIBlueprint
from flask import current_app
from flask_jwt_extended import (
    create_access_token,
    create_refresh_token,
    jwt_required,
)
from sqlalchemy import select
from sqlalchemy.orm import noload
from iti.applications.common.exceptions.biz_exp import BizException
from iti.applications.common.utils import success
from iti.applications.common.events import UserEvents
from iti.applications.extensions.limit import limiter
from iti.applications.models import User, UserSchema, Role, SysDept
from datetime import timedelta
from flask_jwt_extended import current_user
from iti.applications.extensions import db, eventbus, sys_log
from iti.applications.common.enums import GenderEnum, StatusEnum, LoginType
from iti.applications.service.sys_config import (
    get_default_user_password,
    get_default_user_roles,
    get_default_user_depts,
)
from .schemas.auth import (
    PasswordLoginRequest,
    CodeLoginRequest,
    RegisterRequest,
    SendVerificationCodeRequest,
)
from iti.applications.service.verification_code import (
    check_verification_code,
    VerificationCodeUsage,
    set_verification_code,
)
from iti.applications.common.enums import LogType

bp = APIBlueprint("sys_index", __name__, url_prefix="/auth", tag="系统.Auth")


@bp.post("/loginByPassword")
@bp.input(PasswordLoginRequest.Schema, location="json")
@sys_log(
    name="密码登录",
    desc="使用密码作为登录认证方式",
    type=LogType.AUTH,
    save_db=True,
    execute_time=True,
)
def loginByPassword(json_data: PasswordLoginRequest):
    """
    登录（仅限密码登录）
    """
    if json_data.username:
        user = db.session.scalar(select(User).filter_by(username=json_data.username))
    elif json_data.phone:
        user = db.session.scalar(select(User).filter_by(phone=json_data.phone))
    elif json_data.email:
        user = db.session.scalar(select(User).filter_by(email=json_data.email))
    if user is None:
        if json_data.autoRegister:
            user = registerByPassword(
                RegisterRequest(
                    username=json_data.username,
                    phone=json_data.phone,
                    email=json_data.email,
                    password=json_data.password,
                    gender=GenderEnum.SECURE,
                    status=StatusEnum.ENABLED,
                )
            )
        else:
            raise BizException("用户不存在")
    if not user.check_password(json_data.password):
        raise BizException("密码错误")
    eventbus.emit(UserEvents.USER_LOGGED_IN.value, user, login_type=LoginType.PASSWORD)
    return success(
        login(user, refresh_token=True),
        message="登录成功",
    )


@bp.post("/loginByCode")
@bp.input(CodeLoginRequest.Schema, location="json")
@sys_log(
    name="验证码登录",
    desc="使用验证码作为登录认证方式，支持短信验证码和邮箱验证码",
    type=LogType.AUTH,
    save_db=True,
    execute_time=True,
)
def loginByCode(json_data: CodeLoginRequest):
    """
    登录（仅限验证码登录）
    """
    if json_data.phone:
        user = db.session.scalar(select(User).filter_by(phone=json_data.phone))
    elif json_data.email:
        user = db.session.scalar(select(User).filter_by(email=json_data.email))
    if user is None:
        if json_data.autoRegister:
            user = registerByCode(
                RegisterRequest(
                    phone=json_data.phone,
                    email=json_data.email,
                    code=json_data.code,
                    gender=GenderEnum.SECURE,
                    status=StatusEnum.ENABLED,
                ),
                skip_check=True,
            )
        else:
            raise BizException("用户不存在")
    if not check_verification_code(
        json_data.phone if json_data.phone else json_data.email,
        json_data.code,
        VerificationCodeUsage.LOGIN,
    ):
        raise BizException("验证码错误")
    return success(login(user, refresh_token=True), message="登录成功")


@bp.post("/logout")
@jwt_required()
@sys_log(
    name="退出登录",
    desc="退出登录",
    type=LogType.AUTH,
    save_db=True,
    execute_time=True,
)
def logout():
    """
    退出登录
    """
    # 触发用户注销事件
    eventbus.emit(UserEvents.USER_LOGOUT.value, current_user)
    return success(message="退出登录成功")


@bp.post("/refresh")
@jwt_required(refresh=True)
@sys_log(
    name="刷新令牌",
    desc="刷新令牌",
    type=LogType.AUTH,
    save_db=True,
    execute_time=True,
)
def refresh():
    """
    刷新令牌
    """
    # 触发用户刷新令牌事件
    eventbus.emit(UserEvents.USER_AUTH_REFRESHED.value, current_user)
    return success(login(current_user, refresh_token=True), message="刷新令牌成功")


@bp.post("/register")
@bp.input(RegisterRequest.Schema, location="json")
@bp.output(UserSchema)
@sys_log(
    name="注册",
    desc="用户注册",
    type=LogType.OPERATION,
    save_db=True,
    execute_time=True,
)
def register(json_data: RegisterRequest):
    """
    注册
    """
    if json_data.password:
        user = registerByPassword(json_data)
    elif json_data.code:
        user = registerByCode(json_data)
    else:
        raise BizException("密码或验证码不能同时为空")

    if user is None:
        raise BizException("注册失败")

    # 触发用户注册事件
    eventbus.emit(UserEvents.USER_REGISTERED.value, user)

    # 注册成功自动登录
    if json_data.autoLogin:
        return success(login(user, refresh_token=True), message="注册成功")

    return success(user, message="注册成功")


@bp.post("/sendVerificationCode")
@bp.input(SendVerificationCodeRequest.Schema, location="json")
@limiter.limit(limit_value="2 per minute")
@sys_log(
    name="发送验证码",
    desc="发送验证码",
    type=LogType.OPERATION,
    save_db=True,
    execute_time=True,
)
def sendVerificationCode(json_data: SendVerificationCodeRequest):
    """
    发送验证码
    """
    # TODO 模拟发送验证码
    return success(
        set_verification_code(
            subject=json_data.phone if json_data.phone else json_data.email,
            usage=json_data.usage,
        ),
        message="发送验证码成功",
    )


@bp.get("/codes")
@jwt_required()
def get_user_permissions():
    """
    获取用户权限编码
    """
    return success(current_user.permissions)


def login(user, refresh_token: bool = False) -> dict:
    """
    JWT登录
    """
    access_token = create_access_token(
        user,
        # additional_claims={
        #     "roles": [role.code for role in user.roles],
        #     "permissions": user.permissions,
        # },
    )
    if refresh_token:
        refresh_token = create_refresh_token(user)
    else:
        refresh_token = None

    return {
        "access_token": access_token,
        "token_type": "Bearer",
        "expires_in": current_app.config.get(
            "JWT_ACCESS_TOKEN_EXPIRES", timedelta(hours=1)
        ).total_seconds(),
        "refresh_token": refresh_token,
        "refresh_expires_in": current_app.config.get(
            "JWT_REFRESH_TOKEN_EXPIRES", timedelta(days=30)
        ).total_seconds(),
    }


def newUserByRegister(req: RegisterRequest) -> User:
    """
    新建用户
    """
    user = User(
        username=req.username,
        phone=req.phone,
        email=req.email,
        realname=req.realname,
        avatar=req.avatar,
        gender=req.gender,
        status=req.status,
    )
    if req.password:
        user.password = req.password
    else:
        user.password = get_default_user_password(default="TBemzAJ4jDvXkm.!")
    # 默认绑定角色
    user.roles = db.session.scalars(
        select(Role)
        .filter(Role.code.in_(get_default_user_roles()))
        .options(noload(Role.menus), noload(Role.users))
    ).all()
    # 默认部门
    user.depts = db.session.scalars(
        select(SysDept)
        .filter(SysDept.id.in_(get_default_user_depts()))
        .options(noload(SysDept.users))
    ).all()
    db.session.add(user)
    db.session.commit()
    return user


def registerByCode(req: RegisterRequest, skip_check: bool = False) -> User:
    """
    注册（仅限验证码注册）
    使用系统配置的默认密码
    使用随机用户名 (基于phone或者email)
    """
    # 前置验证,用户是否存在
    if req.phone:
        user = db.session.scalar(select(User).filter_by(phone=req.phone))
    elif req.email:
        user = db.session.scalar(select(User).filter_by(email=req.email))
    if user is not None:
        raise BizException("用户已存在")

    # 验证验证码是否正确
    if not skip_check:
        if not check_verification_code(
            req.phone if req.phone else req.email,
            req.code,
            VerificationCodeUsage.REGISTER,
        ):
            raise BizException("验证码错误")
        current_app.logger.warning(f"验证码注册，跳过验证码验证: {req.code}")

    if not req.username:
        if req.phone:
            req.username = f"用户_{req.phone}"
        elif req.email:
            req.username = f"用户_{req.email}"
    return newUserByRegister(req)


def registerByPassword(req: RegisterRequest):
    """
    注册（仅限密码注册）
    """
    # 前置验证,用户是否存在
    if req.username:
        user = db.session.scalar(select(User).filter_by(username=req.username))
    elif req.phone:
        user = db.session.scalar(select(User).filter_by(phone=req.phone))
    elif req.email:
        user = db.session.scalar(select(User).filter_by(email=req.email))
    if user is not None:
        raise BizException("用户已存在")
    return newUserByRegister(req)