#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from __future__ import annotations

import json
import sys
import urllib.parse
import urllib.request


def fetch_closes(symbol: str, range_: str = "6mo", interval: str = "1d") -> list[float]:
    base = f"https://query1.finance.yahoo.com/v8/finance/chart/{symbol}"
    params = {"range": range_, "interval": interval}
    url = f"{base}?{urllib.parse.urlencode(params)}"

    req = urllib.request.Request(url, headers={"User-Agent": "Mozilla/5.0"})
    with urllib.request.urlopen(req, timeout=30) as resp:
        data = json.loads(resp.read().decode("utf-8", errors="replace"))

    result = data.get("chart", {}).get("result", [])
    if not result:
        return []

    quote = result[0].get("indicators", {}).get("quote", [])
    if not quote:
        return []

    closes = quote[0].get("close", [])
    return [float(x) for x in closes if x is not None]


def sma(values: list[float], window: int) -> float:
    return sum(values[-window:]) / window


def main() -> None:
    symbol = sys.argv[1] if len(sys.argv) > 1 else "00922.TW"
    closes = fetch_closes(symbol)

    if len(closes) < 60:
        print(f"{symbol} 資料不足：至少需要 60 筆日收盤，當前 {len(closes)}")
        return

    price = closes[-1]
    ma5 = sma(closes, 5)
    ma10 = sma(closes, 10)
    ma20 = sma(closes, 20)
    ma60 = sma(closes, 60)

    bias20 = ((price - ma20) / ma20) * 100

    print(f"{symbol} 均線摘要")
    print(f"- 收盤：{price:.2f}")
    print(f"- MA5 ：{ma5:.2f}")
    print(f"- MA10：{ma10:.2f}")
    print(f"- MA20：{ma20:.2f}")
    print(f"- MA60：{ma60:.2f}")
    print(f"- 20日乖離：{bias20:.2f}%")

    # 簡單判讀
    trend = []
    if price > ma20:
        trend.append("站上月線")
    else:
        trend.append("跌破月線")

    if ma20 > ma60:
        trend.append("中期偏多")
    else:
        trend.append("中期偏弱")

    if ma5 > ma20:
        trend.append("短線強於月線")
    else:
        trend.append("短線弱於月線")

    print(f"- 判讀：{'／'.join(trend)}")


if __name__ == "__main__":
    main()