# fastapi
from fastapi import FastAPI, Request, Response, HTTPException, status, Depends
from fastapi import templating
from fastapi.templating import Jinja2Templates
from fastapi.responses import HTMLResponse, RedirectResponse, JSONResponse
from fastapi.middleware.cors import CORSMiddleware

# static file
from fastapi.staticfiles import StaticFiles

# fastapi view function parameters
from typing import List, Optional

# path
import os

# time
# import datetime
from datetime import timedelta, datetime

# db
import dataset
from passlib import context
import models

# authorize
from passlib.context import CryptContext
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
from jose import JWTError, jwt
from fastapi_jwt_auth import AuthJWT
from fastapi_jwt_auth.exceptions import AuthJWTException
from fastapi.security import OAuth2AuthorizationCodeBearer, OAuth2PasswordRequestForm
import pymysql
pymysql.install_as_MySQLdb()

# app
app = FastAPI()
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


SECRET_KEY = "df2f77bd544240801a048bd4293afd8eeb7fff3cb7050e42c791db4b83ebadcd"
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 3000
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

# 
app.mount(path='/templates', app=StaticFiles(directory='templates'), name='templates')
app.mount(path='/static', app=StaticFiles(directory='static'), name='static ')



# 
templates = Jinja2Templates(directory='templates')


@AuthJWT.load_config
def get_config():
    return models.Settings()


# view
@app.get('/', response_class=HTMLResponse)
async def index(request: Request):
    print(request)
    return templates.TemplateResponse(name='index.html', context={'request': request})
     
@app.get('/login', response_class=HTMLResponse)
async def login(request: Request):
    return templates.TemplateResponse(name='login.html', context={'request': request})

@app.post("/login")
async def login_for_access_token(request: Request, form_data: OAuth2PasswordRequestForm = Depends(), Authorize: AuthJWT = Depends()):
    db = dataset.connect('mysql://choozmo:pAssw0rd@db.ptt.cx:3306/aaron_testdb?charset=utf8mb4')
    user = authenticate_user(form_data.username, form_data.password)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password",
            headers={"WWW-Authenticate": "Bearer"},
        )
    access_token_expires = timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    access_token = create_access_token(
        data={"sub": user.username}, expires_delta=access_token_expires
    )
    table = db['users']
    user.token = access_token
    print(user)
    table.update(dict(user), ['username'])
    access_token = Authorize.create_access_token(subject=user.username)
    refresh_token = Authorize.create_refresh_token(subject=user.username)
    Authorize.set_access_cookies(access_token)
    Authorize.set_refresh_cookies(refresh_token)
    # return templates.TemplateResponse("home.html", {"request": request, "msg": 'Login'})
    return {"access_token": access_token, "token_type": "bearer"}       # 回傳token給前端

    
@app.get('/register', response_class=HTMLResponse)
async def login(request: Request):
    return templates.TemplateResponse(name='register.html', context={'request': request})

@app.post('/register')
async def register(request: Request, form_data: OAuth2PasswordRequestForm = Depends()):
    user = models.User(**await request.form())
    print(form_data.username, form_data.password, user)
    
    # 密碼加密
    user.password = get_password_hash(user.password)
    
    # 存入DB
    db = dataset.connect('mysql://choozmo:pAssw0rd@db.ptt.cx:3306/aaron_testdb?charset=utf8mb4')
    user_table = db['users']
    user_table.insert(dict(user))
    
    # 跳轉頁面至登入
    return templates.TemplateResponse(name='login.html', context={'request': request})

@app.get('/home', response_class=HTMLResponse)
async def home(request: Request):
    return templates.TemplateResponse(name='home.html', context={'request': request})

@app.get('/tower', response_class=HTMLResponse)
async def tower(request: Request):
    return templates.TemplateResponse(name='tower.html', context={'request': request})

@app.get('/optim', response_class=HTMLResponse)
async def optim(request: Request):
    return templates.TemplateResponse(name='optim.html', context={'request': request})

@app.get('/vibration', response_class=HTMLResponse)
async def vibration(request: Request):
    return templates.TemplateResponse(name='vibration.html', context={'request': request})

@app.get('/history', response_class=HTMLResponse)
async def history(request: Request):
    return templates.TemplateResponse(name='history.html', context={'request': request})

@app.get('/device', response_class=HTMLResponse)
async def device(request: Request):
    return templates.TemplateResponse(name='device.html', context={'request': request})

@app.get('/system', response_class=HTMLResponse)
async def system(request: Request):
    return templates.TemplateResponse(name='system.html', context={'request': request})







# Login funtion part
def check_user_exists(username):
    db = dataset.connect('mysql://choozmo:pAssw0rd@db.ptt.cx:3306/aaron_testdb?charset=utf8mb4')
    if int(next(iter(db.query('SELECT COUNT(*) FROM aaron_testdb.users WHERE userName = "'+username+'"')))['COUNT(*)']) > 0:
        return True
    else:
        return False

def get_user(username: str):
    """ 取得使用者資訊(Model) """
    db = dataset.connect('mysql://choozmo:pAssw0rd@db.ptt.cx:3306/aaron_testdb?charset=utf8mb4')
    if not check_user_exists(username):  # if user don't exist
        return False
    user_dict = next(
        iter(db.query('SELECT * FROM aaron_testdb.users where userName ="'+username+'"')))
    user = models.User(**user_dict)
    return user
    
def user_register(user):
    db = dataset.connect('mysql://choozmo:pAssw0rd@db.ptt.cx:3306/aaron_testdb?charset=utf8mb4')
    table = db['users']
    user.password = get_password_hash(user.password)
    table.insert(dict(user))

def get_password_hash(password):
    """ 加密密碼 """
    return pwd_context.hash(password)

def verify_password(plain_password, hashed_password):
    """ 驗證密碼(hashed) """
    return pwd_context.verify(plain_password, hashed_password)

def authenticate_user(username: str, password: str):
    """ 連線DB，讀取使用者是否存在。 """
    db = dataset.connect('mysql://choozmo:pAssw0rd@db.ptt.cx:3306/aaron_testdb?charset=utf8mb4')
    if not check_user_exists(username):  # if user don't exist
        return False
    user_dict = next(iter(db.query('SELECT * FROM aaron_testdb.users where userName ="'+username+'"')))
    user = models.User(**user_dict)
    if not verify_password(password, user.password):
        return False
    return user

def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
    """ 創建token，並設定過期時間。 """
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(minutes=15)
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
    return encoded_jwt