#!/usr/bin/env python3

import http.client as http
import json
import matplotlib.pyplot as plt

from datetime import datetime, timedelta
from matplotlib.dates import DateFormatter

# 1    = */5 * * * *
# < 90 = 0   * * * *
# > 90 = 0   0 * * *
DAYS = 30
COIN = "bitcoin"
CURRENCY = "usd"


def create_graph(dates: list[datetime], values: list[float]):
    _, ax = plt.subplots()

    plt.rcParams.update({"font.weight": "bold"})
    ax.xaxis.set_major_formatter(DateFormatter("%m-%d"))  # pyright: ignore
    ax.plot(dates, values, linewidth=4.0, color="red")  # pyright: ignore
    plt.tight_layout()
    plt.savefig("foo.png", transparent=True)


def get_time_range(days: int) -> list[datetime]:
    now = datetime.now()
    time_change = timedelta(hours=1)

    return [now + time_change * hour for hour in range(-days * 24, 1)]


def main():
    url = "api.coingecko.com"
    path = f"/api/v3/coins/{COIN}/market_chart?vs_currency={CURRENCY}&days={DAYS}&precision=2"

    client = http.HTTPSConnection(url)
    client.request("GET", path)

    # dict("prices", "market_caps", "total_volumes")
    market_chart = json.loads(client.getresponse().read())

    create_graph(get_time_range(DAYS), list(zip(*market_chart["prices"]))[1])


if __name__ == "__main__":
    main()