#!/usr/bin/env python3
# -- coding:utf-8 --
# @Author: markushammered@gmail.com
# @Development Tool: PyCharm
# @Create Time: 2022/2/3
# @File Name: app.py


import time
from gevent import pywsgi
from flask import Flask
from flask import request
from flask import Response
from flask import make_response
from flask import send_from_directory
from bin.core.render_ import render_temp_
from bin.core.b64img import re_sort_number_image
from bin.core.length import make_html
from db.db import (fetch_data, update_data)

app = Flask(__name__)


def error_length(length: int) -> Response:
    """
    数值太长显示此页面
    :param length:
    :return:
    """
    response = make_response({'code': 200,
                              'message': f'错误的长度: {length}'})
    response.status_code = 200
    response.headers['Content-Type'] = 'application/json; charset=utf-8'
    response.headers['cache-control'] = 'max-age=0, no-cache, no-store, must-revalidate'
    response.headers['date'] = time.ctime()
    return response


def too_lang_to_count(name: str) -> Response:
    """
    数据过长重置数据
    :param name:
    :return:
    """
    update_data(name, 0)
    response = make_response({'code': 200,
                              'message': f'当前长度超过了最大可计数长度:10. 已将重置该名称的计数器'})
    response.headers['Content-Type'] = 'application/json; charset=utf-8'
    response.headers['cache-control'] = 'max-age=0, no-cache, no-store, must-revalidate'
    response.headers['date'] = time.ctime()
    return response


def arg_not_be_full() -> Response:
    """
    参数不完整
    :return:
    """
    response = make_response({'code': 200,
                              'message': '参数填写不完整或填写错误'})
    response.status_code = 200
    response.headers['Content-Type'] = 'application/json; charset=utf-8'
    response.headers['cache-control'] = 'max-age=0, no-cache, no-store, must-revalidate'
    response.headers['date'] = time.ctime()
    return response


def build_page(name: str, length: int) -> list[Response] | list[bool | str] | list[bool]:
    """
    渲染最终的页面
    :param name:
    :param length:
    :return:
    """
    count = fetch_data(name)
    if len(str(count)) > length:
        return [False, too_lang_to_count(name)]
    if 7 <= length <= 10:
        make_html(length)
        zero_count = '0' * (length - len(str(count))) + str(count)
        sorted_image = re_sort_number_image(zero_count)
        return [True, render_temp_(length, name, sorted_image)]
    else:
        return [False, 'BadLength']


@app.route('/API', methods=['GET', 'POST'])  # 允许 GET 和 POST 方法
def api_page() -> Response | str:
    """
    API 页面函数
    :return:
    """
    if 'length' in request.args:
        try:
            length = int(request.args['length'])
        except ValueError:
            return arg_not_be_full()
    else:
        length = 8
    if 'name' in request.args:
        name = request.args['name']
        if name != '':  # 数据为空返回参数不完整界面
            resp = build_page(name, length)
            if resp[0]:
                response = make_response(resp[1])
                response.headers['Content-Type'] = 'image/svg+xml; charset=utf-8'
                response.headers['cache-control'] = 'max-age=0, no-cache, no-store, must-revalidate'
                response.headers['date'] = time.ctime()
                return response
            elif resp[1] == 'BadLength':
                return error_length(length)
            else:
                return resp[1]
        else:
            return arg_not_be_full()
    else:
        return arg_not_be_full()


@app.route('/', methods=['GET', 'POST'])
def index():
    """
    索引页面
    :return:
    """
    return send_from_directory('./static', 'index.html')


if __name__ == '__main__':
    # app.run(threaded=True)
    print('服务器已在http://127.0.0.1:5000 运行. \n除了请求次数和名称会被保存到本地数据库中其余任何数据都不会被保存')
    try:
        server = pywsgi.WSGIServer(('0.0.0.0', 5000), app)
        server.serve_forever()
    except OSError:
        print('5000 端口被占用')