import datetime
import os
import uuid
import threading
from fastapi import FastAPI, Depends, UploadFile, Form, File
from sqlalchemy import or_
from sqlalchemy.orm import Session
from starlette.requests import Request
from starlette.responses import HTMLResponse, FileResponse
import random

from starlette.staticfiles import StaticFiles

import database
from database import engine, SessionLocal, Base

Base.metadata.create_all(bind=engine)
app = FastAPI()
if not os.path.exists('./static'):
    os.makedirs('./static')
app.mount("/static", StaticFiles(directory="static"), name="static")

############################################
# 需要修改的参数
# 允许错误次数
error_count = 5
# 禁止分钟数
error_minute = 10
# 后台地址
admin_address = 'admin'
# 管理密码
admin_password = 'admin'
# 文件大小限制 10M
file_size_limit = 1024 * 1024 * 10
# 系统标题
title = '文件快递柜'
# 系统描述
description = 'FileCodeBox，文件快递柜，口令传送箱，匿名口令分享文本，文件，图片，视频，音频，压缩包等文件'
# 系统关键字
keywords = 'FileCodeBox，文件快递柜，口令传送箱，匿名口令分享文本，文件，图片，视频，音频，压缩包等文件'
############################################

index_html = open('templates/index.html', 'r', encoding='utf-8').read() \
    .replace('{{title}}', title) \
    .replace('{{description}}', description) \
    .replace('{{keywords}}', keywords)
admin_html = open('templates/admin.html', 'r', encoding='utf-8').read() \
    .replace('{{title}}', title) \
    .replace('{{description}}', description) \
    .replace('{{keywords}}', keywords)

error_ip_count = {}


def delete_file(files):
    for file in files:
        if file['type'] != 'text':
            os.remove('.' + file['text'])


def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def get_code(db: Session = Depends(get_db)):
    code = random.randint(10000, 99999)
    while db.query(database.Codes).filter(database.Codes.code == code).first():
        code = random.randint(10000, 99999)
    return str(code)


def get_file_name(key, ext, file):
    now = datetime.datetime.now()
    file_bytes = file.file.read()
    size = len(file_bytes)
    if size > file_size_limit:
        return size, '', '', ''
    path = f'./static/upload/{now.year}/{now.month}/{now.day}/'
    name = f'{key}.{ext}'
    if not os.path.exists(path):
        os.makedirs(path)
    with open(f'{os.path.join(path, name)}', 'wb') as f:
        f.write(file_bytes)
    return size, path[1:] + name, file.content_type, file.filename


@app.get(f'/{admin_address}')
async def admin():
    return HTMLResponse(admin_html)


@app.post(f'/{admin_address}')
async def admin_post(request: Request, db: Session = Depends(get_db)):
    if request.headers.get('pwd') == admin_password:
        codes = db.query(database.Codes).all()
        return {'code': 200, 'msg': '查询成功', 'data': codes}
    else:
        return {'code': 404, 'msg': '密码错误'}


@app.delete(f'/{admin_address}')
async def admin_delete(request: Request, code: str, db: Session = Depends(get_db)):
    if request.headers.get('pwd') == admin_password:
        file = db.query(database.Codes).filter(database.Codes.code == code).first()
        threading.Thread(target=delete_file, args=([{'type': file.type, 'text': file.text}],)).start()
        db.delete(file)
        db.commit()
        return {'code': 200, 'msg': '删除成功'}
    else:
        return {'code': 404, 'msg': '密码错误'}


@app.get('/')
async def index():
    return HTMLResponse(index_html)


def check_ip(ip):
    # 检查ip是否被禁止
    if ip in error_ip_count:
        if error_ip_count[ip]['count'] >= error_count:
            if error_ip_count[ip]['time'] + datetime.timedelta(minutes=error_minute) > datetime.datetime.now():
                return False
            else:
                error_ip_count.pop(ip)
    return True


def ip_error(ip):
    ip_info = error_ip_count.get(ip, {'count': 0, 'time': datetime.datetime.now()})
    ip_info['count'] += 1
    error_ip_count[ip] = ip_info
    return ip_info['count']


@app.get('/file')
async def get_file(code: str, db: Session = Depends(get_db)):
    file = db.query(database.Codes).filter(database.Codes.code == code).first()
    if file:
        if file.type == 'text':
            return {'code': code, 'msg': '查询成功', 'data': file.text}
        else:
            return FileResponse('.' + file.text)
    else:
        return {'code': 404, 'msg': '口令不存在'}


@app.post('/')
async def index(request: Request, code: str, db: Session = Depends(get_db)):
    ip = request.client.host
    if not check_ip(ip):
        return {'code': 404, 'msg': '错误次数过多，请稍后再试'}
    info = db.query(database.Codes).filter(database.Codes.code == code).first()
    if not info:
        return {'code': 404, 'msg': f'取件码错误，错误{error_count - ip_error(ip)}次将被禁止10分钟'}
    if info.exp_time < datetime.datetime.now() or info.count == 0:
        threading.Thread(target=delete_file, args=([{'type': info.type, 'text': info.text}],)).start()
        db.delete(info)
        db.commit()
        return {'code': 404, 'msg': '取件码已过期，请联系寄件人'}
    info.count -= 1
    db.commit()
    if info.type != 'text':
        info.text = f'/file?code={code}'
    return {
        'code': 200,
        'msg': '取件成功，请点击"取"查看',
        'data': {'type': info.type, 'text': info.text, 'name': info.name, 'code': info.code}
    }


@app.post('/share')
async def share(text: str = Form(default=None), style: str = Form(default='2'), value: int = Form(default=1),
                file: UploadFile = File(default=None), db: Session = Depends(get_db)):
    exps = db.query(database.Codes).filter(
        or_(
            database.Codes.exp_time < datetime.datetime.now(),
            database.Codes.count == 0
        )
    )
    threading.Thread(target=delete_file, args=([[{'type': old.type, 'text': old.text}] for old in exps.all()],)).start()
    exps.delete()
    db.commit()
    code = get_code(db)
    if style == '2':
        if value > 7:
            return {'code': 404, 'msg': '最大有效天数为7天'}
        exp_time = datetime.datetime.now() + datetime.timedelta(days=value)
        exp_count = -1
    elif style == '1':
        if value < 1:
            return {'code': 404, 'msg': '最小有效次数为1次'}
        exp_time = datetime.datetime.now() + datetime.timedelta(days=1)
        exp_count = value
    else:
        exp_time = datetime.datetime.now() + datetime.timedelta(days=1)
        exp_count = -1
    key = uuid.uuid4().hex
    if file:
        size, _text, _type, name = get_file_name(key, file.filename.split('.')[-1], file)
        if size > file_size_limit:
            return {'code': 404, 'msg': '文件过大'}
    else:
        size, _text, _type, name = len(text), text, 'text', '文本分享'
    info = database.Codes(
        code=code,
        text=_text,
        size=size,
        type=_type,
        name=name,
        count=exp_count,
        exp_time=exp_time,
        key=key
    )
    db.add(info)
    db.commit()
    return {
        'code': 200,
        'msg': '分享成功，请点击文件箱查看取件码',
        'data': {'code': code, 'key': key, 'name': name, 'text': _text}
    }


if __name__ == '__main__':
    import uvicorn

    uvicorn.run('main:app', host='0.0.0.0', port=12345)