import base64
import io
import numpy as np

from pydantic import BaseModel
from helper.utils import encrypt_md5, timezone_now
from PIL import Image
from fastapi import APIRouter, Depends, BackgroundTasks, Request
from arcsoft.arcface import FaceRecognitionEngine
from arcsoft.exception import FaceNotFoundException, FaceMoreThanOneException, ArcSoftCallException, NonLivingException, \
    UserNotFoundException
from helper import respond_to, login_required
from helper.log import record_log
from models import User, Log

router = APIRouter(prefix='/sessions')


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


class FaceModel(BaseModel):
    raw: str    # base64的人脸图片


class FaceRebindModel(BaseModel):
    source_id: str
    target_id: str


@router.post('', summary='账号密码登录')
async def create(model: SignInModel):
    user = await User.get_or_none(username=model.username.strip())
    if user is None:
        return respond_to(code=404, desc='账号尚未注册')
    if user.locked:
        return respond_to(code=423, desc='账号已被锁定')
    if not encrypt_md5(model.password) == user.password_digest:
        return respond_to(code=403, desc='账号与密码不匹配')

    user.login_frozen_count = 0
    user.last_attempt_at = None
    user.last_login_at = timezone_now()
    await user.save(update_fields=['login_frozen_count', 'last_attempt_at', 'last_login_at'])
    return respond_to(data=await user.profile)


@router.post('/face', summary='人脸识别登录')
@router.post('/receive_face', summary='移库领用人脸识别')
async def create(model: FaceModel):
    # 审核人：林长青 2023-05-30
    bin = base64.b64decode(model.raw)
    image = Image.open(io.BytesIO(bin))
    buffer = np.array(image)
    users = await User.filter(face__isnull=False).values_list('id', 'face')
    with FaceRecognitionEngine() as engine:
        try:
            user_id = engine.login(buffer, users)
        except UserNotFoundException:
            return respond_to(code=400, desc='人脸信息尚未绑定')
        except ArcSoftCallException:
            return respond_to(code=400, desc='人脸底层接口无法调用')
        except FaceNotFoundException:
            return respond_to(code=400, desc='未检测到人脸信息')
        except FaceMoreThanOneException:
            return respond_to(code=400, desc='检测到多张人脸')
        except NonLivingException:
            return respond_to(code=400, desc='检测到非活体')

    user = await User.get_or_none(id=user_id)
    if user.locked:
        return respond_to(code=423, desc='账号已被锁定')

    record = {"user_id": user.id, "users": user.username, "kind": "用户", "comment": f"用户{user.username}，登录成功"}
    await record_log(**record)
    user.login_frozen_count = 0
    user.last_attempt_at = None
    user.last_login_at = timezone_now()
    await user.save(update_fields=['login_frozen_count', 'last_attempt_at', 'last_login_at'])
    return respond_to(data=await user.profile)


@router.put('/face/{target_user_id}', summary='人脸信息绑定', dependencies=[Depends(login_required)])
async def update(request: Request, model: FaceModel, target_user_id: str, tasks: BackgroundTasks):
    # 审核人：林长青 2023-05-30
    bin = base64.b64decode(model.raw)
    image = Image.open(io.BytesIO(bin))
    buffer = np.array(image)

    users = await User.filter(face__isnull=False).values_list('id', 'face')

    with FaceRecognitionEngine() as engine:
        try:
            user_id = engine.login(buffer, users)
            if str(user_id) != target_user_id:
                return respond_to(code=409, desc='当前人脸已与其他账号绑定, 是否确认更换？', data={'source_id': user_id})

            user = await User.get(id=target_user_id)
            user.face = engine.feature(buffer)
            await user.save(update_fields=['face'])
            tasks.add_task(Log.write, '用户',
                           {'user_id': request.state.current_user.id, 'comment': f'{user.nickname}重新绑定人脸信息'})
            record = {"user_id": user.id, "users": user.username, "kind": "用户",
                      "comment": f"用户{user.username}，绑定人脸信息"}
            await record_log(**record)

            return respond_to()
        except UserNotFoundException:
            user = await User.get(id=target_user_id)
            user.face = engine.feature(buffer)
            await user.save(update_fields=['face'])
            tasks.add_task(Log.write, '用户',
                           {'user_id': request.state.current_user.id, 'comment': f'{user.nickname}绑定人脸信息'})
            record = {"user_id": user.id, "users": user.username, "kind": "用户",
                      "comment": f"用户{user.username}，绑定人脸信息"}
            await record_log(**record)
            return respond_to()
        except ArcSoftCallException:
            return respond_to(code=400, desc='接口调用失败')
        except FaceNotFoundException:
            return respond_to(code=400, desc='未检测到人脸信息')
        except FaceMoreThanOneException:
            return respond_to(code=400, desc='检测到多张人脸')
        except NonLivingException:
            return respond_to(code=400, desc='检查到非活体')


@router.patch('/face', summary='人脸信息更换绑定', dependencies=[Depends(login_required)])
async def update(request: Request, model: FaceRebindModel, tasks: BackgroundTasks):
    # 审核人：林长青 2023-05-30
    source_user = await User.get(id=model.source_id)
    target_user = await User.get(id=model.target_id)
    target_user.face = source_user.face
    source_user.face = None
    await target_user.save(update_fields=['face'])
    await source_user.save(update_fields=['face'])
    tasks.add_task(Log.write, '用户',
                   {'user_id': request.state.current_user.id, 'comment': f'{target_user.nickname}更换人脸信息'})
    return respond_to()