import requests
from datetime import datetime

def get_fiat_price(currency: str, date: str = None):
    url_base = "https://api.exchangerate.host/"
    endpoint = f"{date}" if date else "latest"
    url = f"{url_base}{endpoint}?base={currency.upper()}&symbols=USD"
    res = requests.get(url)
    data = res.json()
    return data['rates']['USD']

def get_crypto_price(crypto_id: str, date: str = None):
    if date:
        d = datetime.strptime(date, "%Y-%m-%d")
        formatted_date = d.strftime("%d-%m-%Y")
        url = f"https://api.coingecko.com/api/v3/coins/{crypto_id}/history?date={formatted_date}"
        res = requests.get(url)
        data = res.json()
        return data["market_data"]["current_price"]["usd"]
    else:
        url = f"https://api.coingecko.com/api/v3/simple/price?ids={crypto_id}&vs_currencies=usd"
        res = requests.get(url)
        return res.json()[crypto_id]["usd"]

def detect_type(symbol: str):
    symbol = symbol.lower()
    crypto_ids = ["bitcoin", "ethereum", "dogecoin"]
    fiat_currencies = ["usd", "eur", "gbp", "try"]
    if symbol in crypto_ids:
        return "crypto"
    elif symbol in fiat_currencies:
        return "fiat"
    elif symbol == "xau":
        return "gold"
    else:
        return "unknown"

def get_price(symbol: str, date: str = None):
    symbol = symbol.lower()
    type_ = detect_type(symbol)
    if type_ == "fiat":
        return get_fiat_price(symbol, date)
    elif type_ == "crypto":
        return get_crypto_price(symbol, date)
    elif type_ == "gold":
        # Altın için XAU/USD kuru kullanılır
        url = f"https://api.exchangerate.host/{date if date else 'latest'}?base=XAU&symbols=USD"
        res = requests.get(url)
        return res.json()["rates"]["USD"]
    else:
        raise ValueError("Bilinmeyen para birimi!")

def hesapla(miktar, birim, tarih):
    eski_fiyat = get_price(birim, tarih)
    bugunku_fiyat = get_price(birim)
    
    eski_deger = miktar * eski_fiyat
    yeni_deger = miktar * bugunku_fiyat
    fark = yeni_deger - eski_deger
    oran = (fark / eski_deger) * 100

    print(f"\n{tarih} tarihinde {miktar} {birim.upper()} = ${round(eski_deger, 2)}")
    print(f"Bugünkü değeri = ${round(yeni_deger, 2)}")
    print(f"Değişim: {round(fark, 2)} USD ({round(oran, 2)}%)\n")

# 🔍 Kullanıcı girişi
miktar = float(input("Miktar gir: "))
birim = input("Para birimi gir (usd, eur, btc, eth, xau): ").lower()
tarih = input("Tarih gir (yyyy-mm-dd): ")

hesapla(miktar, birim, tarih)