import json
from datetime import date, datetime, timedelta
from typing import List

import requests

date_format = "%Y-%m-%dT%H:%M:%S%z"


class EngieAPI:
    def __init__(self, cache: bool = False):
        self.url = "https://benergy-back.azurewebsites.net/api/gateway/mercure"
        self.headers = {
            "Host": "benergy-back.azurewebsites.net",
            "Content-Type": "application/json",
            "Origin": "https://engieenergy.azurewebsites.net",
            "Accept-Encoding": "gzip, deflate, br",
            "Accept": "application/json, text/plain, */*",
            "User-Agent": "Mozilla/5.0 (Linux; Android 7.0; SM-G930V Build/NRD90M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.125 Mobile Safari/537.36",
            "Referer": "https://engieenergy.azurewebsites.net/",
            "Content-Length": "294",
            "Accept-Language": "en-GB,en;q=0.9",
        }

        self.cache = cache
        self.cache_file = "EngieCache.json"

    def get_epex_spot(self, date: date) -> List[float]:
        if self.cache:
            try:
                with open("EngieCache.json", "r") as f:
                    cache = json.load(f)
            except FileNotFoundError:
                cache = {}

            if date.strftime("%Y-%m-%d") in cache:
                return cache[date.strftime("%Y-%m-%d")]

        to_date = datetime(date.year, date.month, date.day, 23, 59, 59)
        from_date = to_date - timedelta(days=1, hours=23, minutes=59, seconds=59)

        data = {
            "ApplicationDate": {
                "From": from_date.strftime(date_format),
                "To": to_date.strftime(date_format),
                "UseTime": True,
            },
            "IncludeOffset": True,
            "Items": [{"IdRef": 7070}],
        }

        res = requests.post(self.url, headers=self.headers, data=json.dumps(data))

        values = []
        for j in res.json()[0]["Points"]:
            # check if the Date is the same as the one requested, attention to the timezone
            if datetime.strptime(j["Date"], date_format).date().strftime(
                "%Y-%m-%d"
            ) == date.strftime("%Y-%m-%d"):
                values.append(j["Value"])

        if self.cache:
            # check if the cache exists else create it
            try:
                with open("EngieCache.json", "r") as f:
                    cache = json.load(f)
            except FileNotFoundError:
                cache = {}

            # update cache
            cache[date.strftime("%Y-%m-%d")] = values

            with open("EngieCache.json", "w+") as f:
                json.dump(cache, f)

        if not values:
            raise ValueError("No data found for this date")
        return values