"""NoneBot 版插件配置加载。

配置持久化在数据目录 config.json，键值结构与原 AstrBot 配置分组一致，
这样可以直接喂给 core 的 ConfigManager（它本质只读嵌套 dict）。
"""

from __future__ import annotations

import json
import os
from pathlib import Path

from .core.shared.constants import PLUGIN_NAME
from .core.utils.paths import get_data_dir


class ConfigDict(dict):
    """兼容原 ConfigManager 的 dict；save_config 会把改动持久化到 config.json。"""

    def save_config(self) -> None:
        try:
            config_file().write_text(
                json.dumps(dict(self), ensure_ascii=False, indent=2, default=str),
                encoding="utf-8",
            )
        except OSError:
            pass


def _build_from_items(items: dict) -> dict:
    """从 schema 的 items 递归生成嵌套默认配置。"""
    out: dict = {}
    for key, item in items.items():
        if not isinstance(item, dict):
            continue
        if item.get("type") == "object" and isinstance(item.get("items"), dict):
            out[key] = _build_from_items(item["items"])
        elif "default" in item:
            out[key] = item["default"]
    return out


def _schema_defaults() -> dict:
    """从插件的 _conf_schema.json 读取完整默认配置。"""
    schema_path = Path(__file__).resolve().parents[0] / "_conf_schema.json"
    try:
        schema = json.loads(schema_path.read_text(encoding="utf-8-sig"))
    except (OSError, json.JSONDecodeError):
        return {}
    defaults: dict = {}
    for group, spec in schema.items():
        if isinstance(spec, dict) and isinstance(spec.get("items"), dict):
            defaults[group] = _build_from_items(spec["items"])
    return defaults


def _read_config_value(*names: str, default: str = "") -> str:
    """依次从 shell 环境变量与 NoneBot driver.config(.env) 读取值。

    NoneBot 的 .env 是通过 pydantic 加载的，不会写入 os.environ，
    因此必须能从 get_driver().config 的小写属性读取。优先环境变量。
    """
    for n in names:
        v = os.environ.get(n)
        if v:
            return str(v)
    try:
        from nonebot import get_driver
        drv_cfg = get_driver().config
    except Exception:
        return default
    for n in names:
        attr = n.lower()
        try:
            v = getattr(drv_cfg, attr, None)
        except Exception:
            v = None
        if v:
            return str(v)
    return default


def _llm_env_values() -> dict:
    """用户必填的 LLM 端点/密钥/模型；AstrBot 版是 Provider 体系，插件本身不存这些。"""
    return {
        "llm_api_base": _read_config_value("HEXI_LLM_API_BASE"),
        "llm_api_key": _read_config_value("HEXI_LLM_API_KEY"),
        "llm_model": _read_config_value("HEXI_LLM_MODEL"),
    }


def _default_config() -> dict:
    cfg = _schema_defaults()
    cfg.setdefault("llm", {}).update(_llm_env_values())
    cfg.setdefault("basic", {}).setdefault("output_format", ["image"])
    cfg.setdefault("basic", {}).setdefault("enable_base64_image", True)
    cfg.setdefault("basic", {}).setdefault("analysis_days", 1)
    cfg.setdefault("basic", {}).setdefault("max_messages", 1000)
    cfg.setdefault("basic", {}).setdefault("min_messages_threshold", 50)
    cfg.setdefault("basic", {}).setdefault("filter_bot_messages", True)
    # 优先读本地消息库（learning_chat 落库），取不到再回退接口分页
    cfg.setdefault("basic", {}).setdefault("use_local_history", True)
    cfg.setdefault("analysis_features", {}).setdefault("chat_quality_analysis_enabled", False)
    cfg.setdefault("incremental", {}).setdefault("incremental_enabled", False)
    return cfg


def config_file() -> Path:
    return get_data_dir(PLUGIN_NAME) / "config.json"


def load_config() -> ConfigDict:
    cfg = ConfigDict(_default_config())
    f = config_file()
    if f.exists():
        try:
            user = json.loads(f.read_text(encoding="utf-8"))
            for group, values in user.items():
                if isinstance(values, dict):
                    cfg.setdefault(group, {}).update(values)
                else:
                    cfg[group] = values
        except (OSError, json.JSONDecodeError) as e:
            _log_warn(f"读取配置文件失败: {e}")
    # 环境变量/NoneBot .env 永远优先于持久化 config.json，避免被空值覆盖
    cfg.setdefault("llm", {}).update(_llm_env_values())
    return cfg


def save_config(cfg: dict) -> None:
    try:
        config_file().write_text(
            json.dumps(cfg, ensure_ascii=False, indent=2), encoding="utf-8"
        )
    except OSError as e:
        _log_warn(f"保存配置文件失败: {e}")


def _log_warn(msg: str) -> None:
    try:
        from .core.utils.logger import logger
        logger.warning(msg)
    except Exception:
        pass