# -*- coding: utf-8 -*-
"""OPC 智能园区后端 —— 全局配置（backend/.env 可覆盖，未配置时用默认值）"""

import os
from pathlib import Path

BASE_DIR = Path(__file__).resolve().parent.parent  # backend/


def _load_dotenv(path):
    """极简 .env 解析：KEY=VALUE，支持 # 注释与引号"""
    if not Path(path).exists():
        return
    for raw in Path(path).read_text("utf-8").splitlines():
        line = raw.strip()
        if not line or line.startswith("#") or "=" not in line:
            continue
        key, _, value = line.partition("=")
        key = key.strip()
        value = value.strip().strip('"').strip("'")
        if key and key not in os.environ:
            os.environ[key] = value


_load_dotenv(BASE_DIR / ".env")


def _env(key, default):
    return os.getenv(key, default)


class Settings:
    # ---- HTTP ----
    HOST = _env("DPM_HOST", _env("FASTAPI_HOST", "0.0.0.0"))
    PORT = int(_env("DPM_PORT", _env("FASTAPI_PORT", "8000")))

    # ---- 数据目录 ----
    MEDIA_DIR = Path(_env("DPM_MEDIA_DIR", str(BASE_DIR / "media")))
    DATA_FILE = Path(_env("DPM_DATA_FILE", str(BASE_DIR / "data.json")))
    DIST_DIR = Path(_env("DPM_DIST_DIR", str(BASE_DIR.parent / "dist")))  # 前端构建产物（可选托管）

    # ---- MQTT（优先使用 .env 中的局域网 Broker 配置） ----
    MQTT_ENABLED = _env("DPM_MQTT_ENABLED", "1") == "1"
    MQTT_HOST = _env("DPM_MQTT_HOST", _env("MQTT_BROKER_HOST", "127.0.0.1"))
    MQTT_PORT = int(_env("DPM_MQTT_PORT", _env("MQTT_BROKER_PORT", "1883")))
    MQTT_USERNAME = _env("DPM_MQTT_USERNAME", _env("MQTT_USERNAME", "")) or None
    MQTT_PASSWORD = _env("DPM_MQTT_PASSWORD", _env("MQTT_PASSWORD", "")) or None
    MQTT_CLIENT_ID = _env("DPM_MQTT_CLIENT_ID", "dpm-backend")
    # 前端 WebSocket 接入地址（默认按 .env 的 broker 主机 + EMQX 常规 ws 端口）
    MQTT_WS_URL = _env(
        "DPM_MQTT_WS",
        f"ws://{_env('MQTT_PUBLIC_HOST', _env('MQTT_BROKER_HOST', 'localhost'))}:8083/mqtt",
    )
    MQTT_TICK_INTERVAL = float(_env("DPM_MQTT_TICK_INTERVAL", "2.2"))

    # ---- 主题 ----
    TOPIC_COMMAND = _env("DPM_TOPIC_COMMAND", "opc/display/command")
    TOPIC_TICK = _env("DPM_TOPIC_TICK", "opc/dashboard/tick")
    TOPIC_ACK = _env("DPM_TOPIC_ACK", "opc/display/ack")
    TOPIC_HEARTBEAT = _env("DPM_TOPIC_HEARTBEAT", "opc/display/heartbeat")
    SCREEN_TTL = float(_env("DPM_SCREEN_TTL", "30"))  # 大屏心跳过期秒数

    # ---- 阿里云 DashScope（LLM + 语音识别） ----
    DASHSCOPE_API_KEY = _env("DASHSCOPE_API_KEY", "")
    LLM_MODEL = _env("DPM_LLM_MODEL", "qwen-plus")          # 通义千问
    ASR_MODEL = _env("DPM_ASR_MODEL", "paraformer-realtime-v2")  # 流式语音识别
    LLM_BASE_URL = _env("DPM_LLM_BASE_URL", "https://dashscope.aliyuncs.com/compatible-mode/v1")
    ASR_TIMEOUT = float(_env("DPM_ASR_TIMEOUT", "30"))

    # ---- 管理后台 ----
    ADMIN_SECRET = _env("DPM_ADMIN_SECRET", "dpm-admin-secret-change-me")

    # ---- s2s 实时语音栈（VAD本地 + 云ASR/LLM/TTS） ----
    S2S_ENABLED = _env("DPM_S2S_ENABLED", "0") == "1"
    S2S_HOST = _env("DPM_S2S_HOST", "0.0.0.0")
    S2S_PORT = int(_env("DPM_S2S_PORT", "8765"))
    S2S_NUM_PIPELINES = int(_env("DPM_S2S_NUM_PIPELINES", "1"))
    S2S_STT_MODEL = _env("DPM_S2S_STT_MODEL", "qwen3-asr-flash-realtime")
    S2S_LLM_MODEL = _env("DPM_S2S_LLM_MODEL", "qwen-plus")
    S2S_TTS_MODEL = _env("DPM_S2S_TTS_MODEL", "qwen3-tts-flash-realtime")
    S2S_TTS_VOICE = _env("DPM_S2S_TTS_VOICE", "Cherry")
    S2S_BUILD_RETRIES = int(_env("DPM_S2S_BUILD_RETRIES", "4"))
    S2S_BUILD_RETRY_DELAY = float(_env("DPM_S2S_BUILD_RETRY_DELAY", "10"))
    S2S_LOG_LEVEL = _env("DPM_S2S_LOG_LEVEL", "INFO").upper()
    # 对外可访问的 s2s 实时语音 WS 地址（供 /api/config 下发；DPM_VOICE_WS 可显式覆盖）
    S2S_WS_URL = _env(
        "DPM_VOICE_WS",
        f"ws://{_env('MQTT_PUBLIC_HOST', _env('MQTT_BROKER_HOST', 'localhost'))}:8765/v1/realtime",
    )
    # 语音助手基础提示词（.env 设 DPM_S2S_INSTRUCTIONS 可覆盖；知识库内容由 rag 自动拼接）
    S2S_INSTRUCTIONS = _env(
        "DPM_S2S_INSTRUCTIONS",
        "你是 PineSound 园区智能语音助手。可用工具：get_park_overview（园区实时数据）、"
        "query_companies（企业名录）、control_display（大屏控制）、get_time（时间）。"
        "涉及园区数据/企业/大屏控制时务必调用工具获取准确信息。请用简洁专业的中文回答，不超过三句话。",
    )



settings = Settings()