"""
配置管理 - 集中管理所有配置项
"""
from pydantic_settings import BaseSettings
from pydantic import Field
from typing import Optional
from pathlib import Path


class Settings(BaseSettings):
    """应用配置 - 所有配置项通过环境变量或 .env 文件设置"""
    
    # ==================== WebSocket 服务器 ====================
    WS_HOST: str = "0.0.0.0"
    WS_PORT: int = 8765
    WS_PATH: str = "/v1/voice/session"
    
    # ==================== 鉴权 ====================
    BEARER_TOKEN: str = "drone-voice-cloud-token-2024"
    
    # ==================== 阿里云百炼 LLM ====================
    DASHSCOPE_API_KEY: str = "sk-8ac47bb8a1f7497a922c52d905dd11dc"
    # 与 LLM 共用 API Key；实时语音识别 Fun-ASR 走 WebSocket inference
    DASHSCOPE_WEBSOCKET_URL: str = (
        "wss://dashscope.aliyuncs.com/api-ws/v1/inference"
    )
    DASHSCOPE_ASR_MODEL: str = "fun-asr-realtime"
    ASR_AUDIO_SAMPLE_RATE: int = 16000
    ASR_SEMANTIC_PUNCTUATION_ENABLED: bool = True
    LLM_PROVIDER: str = "dashscope"  # 服务提供者: dashscope | local (后续扩展)
    LLM_MODEL: str = "qwen-plus"  # qwen-turbo | qwen-plus | qwen-max
    LLM_MAX_TOKENS: int = 512
    LLM_TEMPERATURE: float = 0.3
    LLM_TIMEOUT: int = 30  # 秒
    LLM_CONTEXT_TURNS: int = 4  # 保留的历史对话轮数
    # Function calling：天气 / 联网摘要等（DashScope tools + 本地执行）
    LLM_TOOLS_ENABLED: bool = True
    LLM_AGENT_MAX_STEPS: int = 8  # 每用户轮最多模型↔工具往返次数（含最终回答）
    LLM_TOOL_RESULT_MAX_CHARS: int = 8000  # 单次 tool 消息写入上下文上限

    # ==================== TTS 配置 ====================
    TTS_PROVIDER: str = "piper"  # piper | azure | local (后续扩展)
    TTS_MODEL_DIR: str = "models"  # Piper 模型目录
    TTS_VOICE_NAME: str = "zh_CN-huayan-medium"  # Piper 语音名称
    TTS_SAMPLE_RATE: int = 24000  # 协议规定 24kHz
    TTS_MAX_CHARS: int = 800  # TTS 最大字符数（超长截断）
    # 闲聊流式 TTS：更早切出首段，降低首字节延迟（见 intent_service.take_next_speech_segment）
    TTS_STREAM_SOFT_FLUSH_LEN: int = 28
    TTS_STREAM_EARLY_WEAK_CUT: bool = True
    TTS_STREAM_EARLY_WEAK_MIN_SEGMENT: int = 6
    TTS_STREAM_EARLY_WEAK_SCAN_CAP: int = 48
    
    # ==================== 超时配置 (毫秒) ====================
    DIALOG_RESULT_TIMEOUT_MS: int = 30000  # LLM 推理超时
    TTS_FIRST_BYTE_TIMEOUT_MS: int = 10000  # TTS 首字节超时
    
    # ==================== 飞控二次确认（dialog_result v1 之 confirm）====================
    FLIGHT_CONFIRM_REQUIRED: bool = True
    FLIGHT_CONFIRM_TIMEOUT_SEC: float = 10.0

    # ==================== 限流 ====================
    MAX_CONCURRENT_SESSIONS: int = 4  # 最大并发 session 数
    
    # ==================== 日志 ====================
    LOG_LEVEL: str = "INFO"
    LOG_TO_FILE: bool = False
    LOG_FILE: str = "logs/server.log"
    
    class Config:
        env_file = ".env"
        env_file_encoding = "utf-8"
        case_sensitive = True


# 全局配置实例
settings = Settings()