import os
import re
import sys
import json

# def is_number(str):
#     try:
#         float(str)
#         return True
#     except ValueError:
#         return False

def is_number(string):
    """ 判断字符串是否为数字类型 """
    pattern = re.compile(r'^[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?$')
    return bool(pattern.match(string))

def get_curve_unit(string):
    xUnit = ''
    yUnit = ''
    xPhysics = ''
    yPhysics = ''

    try:
        unit_dict = json.loads(string)
        xUnit = unit_dict.get('xUnit')
        yUnit = unit_dict.get('yUnit')
        xPhysics = unit_dict.get('xPhysics')
        yPhysics = unit_dict.get('yPhysics')
    except:
        pass

    return xUnit, yUnit, xPhysics, yPhysics


def get_curve_params(curvePath, decimal):
    """ 获取曲线文件最大最小值 """
    valueList = []
    with open(curvePath, 'r+', encoding='utf-8') as fr:
        lines = fr.readlines()
        for line in lines:
            if line.__contains__(','):
                yValue = line.split(',')[1]
                if(is_number(yValue)):
                    valueList.append(float(yValue))

    maxValue = round(max(valueList), decimal)
    minValue = round(min(valueList), decimal)

    xUnit, yUnit, xPhysics, yPhysics = get_curve_unit(lines[0])
    curve_params = {"max":maxValue, "min":minValue, "xUnit":xUnit, "yUnit":yUnit, "xPhysics":xPhysics, "yPhysics":yPhysics}
    print(json.dumps(curve_params, ensure_ascii=False))


if __name__=='__main__':
    # 曲线文件路径
    curvePath = sys.argv[1]
    # 保留小数点位数
    try:
        decimal = int(sys.argv[2])
    except:
        decimal = 3

    get_curve_params(curvePath, decimal)