#!/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 flask import Flask
from flask import request
from flask import Response
from flask import make_response
from flask import send_from_directory
from bin.render_ import render_temp_
from bin.b64img import re_sort_number_image
from bin.length import make_html
from wsgiref.simple_server import make_server
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() -> Response:
    """
    数据过长重置数据
    :return:
    """
    response = make_response({'code': 200,
                              'message': f'当前长度超过了预设的值'})
    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) -> Response | str | bool:
    """
    渲染最终的页面
    :param name:
    :param length:
    :return:
    """
    count = fetch_data(name)
    if len(str(count)) > length:
        return too_lang_to_count()
    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 render_temp_(length, name, sorted_image)
    else:
        return False


@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:
                response = make_response(resp)
                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
            else:
                return error_length(length)
        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__':
    server = make_server('', 5000, app)
    server.serve_forever()