# /// script
# requires-python = ">=3.13"
# dependencies = [
#     "flask",
# ]
# ///
import socket

def find_free_port(start=5000, max_tries=100):
    """
    從 start 開始找一個未被監聽的 TCP 端口，最多嘗試 max_tries 次
    """
    port = start
    for _ in range(max_tries):
        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
            s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
            if s.connect_ex(('0.0.0.0', port)) != 0:
                return port
        port += 1
    raise RuntimeError(f"在 {start}–{start+max_tries} 範圍內找不到可用端口")

import json
from flask import Flask, request, Response
from converter import Converter

app = Flask(__name__)
conv = Converter()

@app.route('/solar2lunar', methods=['GET'])
def solar2lunar_endpoint():
    date_str = request.args.get('date')
    if not date_str:
        return Response(json.dumps({'error': '缺少參數 date，格式 YYYY-MM-DD'}), mimetype='application/json; charset=utf-8'), 400
    try:
        info_raw = conv.solar_to_lunar(date_str)
        info = {
            'gregorian': info_raw['西曆'],  # Gregorian date
            'lunar': info_raw['農曆'],      # Lunar date
            'ganzhi': info_raw['干支'],     # Heavenly Stem and Earthly Branch
            'zodiac': info_raw['生肖'],      # Zodiac animal
            'solar_term': info_raw['節氣']   # Solar term
        }
        return Response(json.dumps(info, ensure_ascii=False), mimetype='application/json; charset=utf-8')
    except Exception as e:
        return Response(json.dumps({'error': str(e)}, ensure_ascii=False), mimetype='application/json; charset=utf-8'), 400

@app.route('/lunar2solar', methods=['GET'])
def lunar2solar_endpoint():
    date_str = request.args.get('date')
    leap_str = request.args.get('leap', 'false')
    if not date_str:
        return Response(json.dumps({'error': '缺少參數 date，格式 YYYY-MM-DD'}), mimetype='application/json; charset=utf-8'), 400
    leap = leap_str.lower() in ('1', 'true', 'yes')
    try:
        y_str, m_str, d_str = date_str.split('-', 2)
        y, m, d = int(y_str), int(m_str), int(d_str)
    except Exception:
        return Response(json.dumps({'error': '農曆日期格式應為 YYYY-MM-DD，閏月請加 leap=true'}), mimetype='application/json; charset=utf-8'), 400
    try:
        solar_date = conv.lunar_to_solar(y, m, d, leap)
        info_raw = conv.solar_to_lunar(solar_date)
        info = {
            'gregorian': info_raw['西曆'],
            'lunar': info_raw['農曆'],
            'ganzhi': info_raw['干支'],
            'zodiac': info_raw['生肖'],
            'solar_term': info_raw['節氣']
        }
        return Response(json.dumps(info, ensure_ascii=False), mimetype='application/json; charset=utf-8')
    except Exception as e:
        return Response(json.dumps({'error': str(e)}, ensure_ascii=False), mimetype='application/json; charset=utf-8'), 400

if __name__ == '__main__':
    port = find_free_port(5000)
    print(f"使用埠 {port} 啟動服務…")
    app.run(host='0.0.0.0', port=port)