# -*- coding: utf-8 -*-
import os
import re

import matplotlib
import pandas as pd
from matplotlib import pyplot as plt

import milkSpider
import settings

plt.rcParams['font.family'] = settings.FONT
# pd.set_option('display.expand_frame_repr', True)
# pd.set_option('display.max_colwidth', 10)

class view:

    def __init__(self, itemList):
        self.name = itemList[1]
        self.string = itemList[10]

    def getFont():  # 列出可用的字体
        font = sorted([f.name for f in matplotlib.font_manager.fontManager.ttflist])
        for i in font:
            print(i)

    def main(self):

        def str2data(string) -> list:
            reg = r"[+-]?([0-9]*\.?[0-9]+|[0-9]+\.?[0-9]*)"
            pattern = re.compile(reg)
            return pattern.findall(string)

        def show(itemList):

            x = []
            y = []
            itemList.pop()
            itemList.reverse()

            for temp in itemList:

                date = temp[0] + "月" + temp[1] + "日"
                price = "￥" + temp[2] + "元"
                x.append(date)
                y.append(price)

                date = temp[3] + "月" + temp[4] + "日"
                price = "￥" + temp[5] + "元"
                x.append(date)
                y.append(price)

            plt.title("商品 [{}] 价格趋势".format(self.name))
            plt.bar(x, y, color = 'g', align = 'center')
            plt.xticks(size = 10.0, rotation = 45)
            plt.xlabel("日期")
            plt.ylabel("价格")
            plt.plot(x, y, color = 'red', linewidth = 5.0, linestyle = '--')  
            
            print("等待可视化界面结束。。。")
            plt.show()

        if self.string == 0:
            print("该商品历史价格趋势数据尚未被收录!")
            return
        itemList = []
        print("以下是商品 [{}] 的历史价格趋势：".format(self.name))
        for astr in self.string.split(';'):
            strList = str2data(astr)
            try:
                print(astr)
                itemList.append(strList)
            except BaseException:
                break
        show(itemList)

def listCatalogues():
    path = r"./Catalogues/"
    dirList = os.listdir(path)
    fileList = []
    for filename in dirList:
        fileList.append(path + filename)
    return len(fileList), fileList

def getData(filename, catalogue):
    while True:
        print("# 当前选择的目录是 {} .".format(catalogue))
        milkSpider.showBanner(menu = "view")
        print("选择一项以查看or返回：", end = '')
        choice = str(input())
        case = {'1': '评论数量(条)', '2': '价格(人民币)'}
        if choice in case.keys():
            mode = case.get(choice)
            sort = False
            break
        elif choice == '3': return
        else: print("无效选择!")
        
    while True:
        print("当前选择的模式是以 [{}] 为基准的排序方式".format(mode))
        print("想要查看多少条数据(int)：", end = '')
        try:
            flag = eval(input())
            break
        except BaseException:
            print("无效输入!")
            continue

    df = pd.read_csv(filename, encoding = 'utf-8', header = 0, error_bad_lines = False)
    if choice == '2': sort = True
    dfnew = df.sort_values(by = mode, ascending = sort)

    try:
        dfnew = dfnew.fillna(0)
        dfnew[["评论数量(条)"]] = dfnew[["评论数量(条)"]].astype(int)
    except BaseException:
        pass

    dfnew = dfnew[:flag]
    while True:
        print(dfnew.iloc[:, [1, 2, 3]])
        indexList = list(dfnew.index)
        while True:
            print("选择一项id以查看详细信息(或者 [r] 返回上层目录)：", end = '')
            try:
                index = str(input())
                index = eval(index)
                if index in indexList:
                    break
                else:
                    print("无效输入!")
                    continue
            except BaseException:
                if index == 'r': return
                print("无效输入!")
                continue
        toShow = dfnew.loc[index]
        print(toShow)
        aitem = view(toShow)
        aitem.main()
        while True:
            flag = str(input("输入 [r]返回上一级菜单 [c]继续查看: "))
            if flag == 'r': return
            elif flag == 'c': break
            else: print("无效选项!")

def main():
    length, fileList = listCatalogues()
    while True:
        print("检测到当前缓存中共有{}个目录：".format(length))
        case = {}
        for i in range(length):
            print("#    {}.{}".format(i + 1, fileList[i][13:-4]))
            case[str(i+1)] = fileList[i]
        print("#    {}.输入 [r] 返回上一级菜单".format(i + 2))
        print("选择一项以查看or返回：", end = '')
        choice = str(input())
        if choice in case.keys():
            getData(case.get(choice), case.get(choice)[13:-4])
        elif choice == 'r': return
        else: print("无效选择!")


if __name__ == "__main__":
    # fileList = listCatalogues()
    # length, dataList = getData(fileList)
    main()


'''
# 数据调试
import pandas as pd

filename = "./Catalogues/milk.csv"
df = pd.read_csv(filename, encoding = 'utf-8', header = 0, error_bad_lines = False)


'''