import os
import configparser
from pathlib import Path

SECTION = "proxy"
DEFAULTS = {
    "remote_domain": "git.zz.com",
    "upstream_host": "62.234.191.215",
    "upstream_port": "3000",
    "listen_port": "13000",
    "listen_host": "127.0.0.1",
}


def get_config_dir():
    if os.name == "nt":
        base = os.environ.get("APPDATA", os.path.expanduser("~"))
    else:
        base = os.environ.get("XDG_CONFIG_HOME", os.path.expanduser("~/.config"))
    return os.path.join(base, "jianda-proxy")


def _ensure_dir(path):
    os.makedirs(path, exist_ok=True)


def get_config_path():
    return os.path.join(get_config_dir(), "config.ini")


def get_pid_path():
    return os.path.join(get_config_dir(), "daemon.pid")


def get_log_path():
    return os.path.join(get_config_dir(), "proxy.log")


def load_config():
    path = get_config_path()
    _ensure_dir(get_config_dir())
    parser = configparser.ConfigParser()
    if not os.path.exists(path):
        parser[SECTION] = dict(DEFAULTS)
        with open(path, "w") as f:
            parser.write(f)
    else:
        parser.read(path)
        if SECTION not in parser:
            parser[SECTION] = dict(DEFAULTS)
    return parser


def set_config_value(key, value):
    if key not in DEFAULTS:
        raise ValueError(f"Unknown config key: {key}. Valid keys: {', '.join(DEFAULTS)}")
    parser = load_config()
    parser[SECTION][key] = value
    with open(get_config_path(), "w") as f:
        parser.write(f)


def get_config_value(key):
    parser = load_config()
    return parser.get(SECTION, key)


def list_config():
    parser = load_config()
    return dict(parser[SECTION])