"""Configuration loader."""

import json
from pathlib import Path

CONFIG_PATH = Path(__file__).parent.parent / "config.json"

DEFAULT_CONFIG: dict = {
    "language": "Chinese",
    "raw_dir": "raw",
    "wiki_dir": "wiki",
}

DEFAULT_LLM_CONFIG: dict = {
    "model": "qwen/qwen3.6-27b",
    "api_base": "http://100.123.83.113:1234/v1",
    "api_key": "123456",
}


def load_config() -> dict:
    """
    加载项目配置。

    返回
    -------
    dict
        配置字典，包含 language、raw_dir、wiki_dir 等键。
    """
    if CONFIG_PATH.is_file():
        with CONFIG_PATH.open(encoding="utf-8") as f:
            user_config = json.load(f)
        config = {**DEFAULT_CONFIG, **user_config}
    else:
        config = DEFAULT_CONFIG.copy()

    return config


def get_language() -> str | None:
    """获取配置的语言设置，"auto" 返回 None 以启用自动检测。"""
    config = load_config()
    language = config.get("language", "auto")
    if language.lower() == "auto":
        return None
    return language


def get_llm_config() -> dict[str, str]:
    """
    获取 LLM 配置。

    返回
    -------
    dict[str, str]
        包含 model, api_base, api_key 的字典。
    """
    config = load_config()
    llm_raw = config.get("llm", {})
    # 过滤空值，避免空字符串覆盖默认配置
    llm_filtered = {k: v for k, v in llm_raw.items() if v}
    return {**DEFAULT_LLM_CONFIG, **llm_filtered}