from functools import lru_cache
from urllib.parse import quote_plus
from pathlib import Path
from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict

ENV_FILE = Path(__file__).resolve().parent / ".env"


class Settings(BaseSettings):
    model_config = SettingsConfigDict(
        env_file=str(ENV_FILE),
        env_file_encoding="utf-8",
        extra="ignore",
    )

    app_name: str = Field(default="banban-server", validation_alias="APP_NAME")
    app_version: str = Field(default="0.1.0", validation_alias="APP_VERSION")
    app_description: str = Field(
        default="Backend service for TalkingQ device",
        validation_alias="APP_DESCRIPTION",
    )

    server_host: str = Field(default="0.0.0.0", validation_alias="SERVER_HOST")
    server_port: int = Field(default=8080, validation_alias="SERVER_PORT")

    asr_provider: str = Field(default="Aliyun", validation_alias="ASR_PROVIDER")
    llm_provider: str = Field(default="Volcano", validation_alias="LLM_PROVIDER")
    tts_provider: str = Field(default="MiniMax", validation_alias="TTS_PROVIDER")

    volcano_api_key: str = Field(default="", validation_alias="VOLCANO_API_KEY")
    volcano_base_url: str = Field(default="", validation_alias="VOLCANO_BASE_URL")
    volcano_model_id: str = Field(default="ep-20250226121739-jkd24", validation_alias="VOLCANO_MODEL_ID")
    volcano_app_id: str = Field(default="7872932045", validation_alias="VOLCANO_APP_ID")
    volcano_access_token: str = Field(default="", validation_alias="VOLCANO_ACCESS_TOKEN")

    minimax_api_key: str = Field(default="", validation_alias="MINIMAX_API_KEY")
    minimax_group_id: str = Field(default="", validation_alias="MINIMAX_GROUP_ID")
    minimax_base_url: str = Field(
        default="https://api.minimax.chat/v1/t2a_v2",
        validation_alias="MINIMAX_BASE_URL",
    )

    aliyun_api_key: str = Field(default="", validation_alias="ALIYUN_API_KEY")
    aliyun_vocabulary_id: str = Field(default="", validation_alias="ALIYUN_VOCABULARY_ID")

    assets_dir: str = Field(default="assets", validation_alias="ASSETS_DIR")
    session_timeout: int = Field(default=600, validation_alias="SESSION_TIMEOUT")
    conversation_history_timeout: int = Field(default=1800, validation_alias="CONVERSATION_HISTORY_TIMEOUT")
    max_conversation_history: int = Field(default=5, validation_alias="MAX_CONVERSATION_HISTORY")
    cleanup_interval: int = Field(default=300, validation_alias="CLEANUP_INTERVAL")
    llm_first_token_timeout: int = Field(default=5, validation_alias="LLM_FIRST_TOKEN_TIMEOUT")
    tts_request_timeout: int = Field(default=5, validation_alias="TTS_REQUEST_TIMEOUT")
    selected_role_key: str = Field(default="", validation_alias="SELECTED_ROLE_KEY")

    db_host: str = Field(default="mysql", validation_alias="DB_HOST")
    db_port: int = Field(default=3306, validation_alias="DB_PORT")
    db_user: str = Field(default="talkingq", validation_alias="DB_USER")
    db_password: str = Field(default="", validation_alias="DB_PASSWORD")
    db_name: str = Field(default="talkingq", validation_alias="DB_NAME")
    db_echo: bool = Field(default=False, validation_alias="DB_ECHO")

    talkingq_mqtt_broker: str = Field(default="broker.emqx.io", validation_alias="TALKINGQ_MQTT_BROKER")
    talkingq_mqtt_port: int = Field(default=1884, validation_alias="TALKINGQ_MQTT_PORT")
    talkingq_mqtt_username: str = Field(default="", validation_alias="TALKINGQ_MQTT_USERNAME")
    talkingq_mqtt_password: str = Field(default="", validation_alias="TALKINGQ_MQTT_PASSWORD")
    talkingq_mqtt_device_prefix: str = Field(default="TalkingQ", validation_alias="TALKINGQ_MQTT_DEVICE_PREFIX")
    talkingq_mqtt_qos: int = Field(default=1, validation_alias="TALKINGQ_MQTT_QOS")
    talkingq_mqtt_keepalive: int = Field(default=60, validation_alias="TALKINGQ_MQTT_KEEPALIVE")
    talkingq_mqtt_nfc_notice_interval: int = Field(default=600, validation_alias="TALKINGQ_MQTT_NFC_NOTICE_INTERVAL")

    admin_api_key: str = Field(default="", validation_alias="ADMIN_API_KEY")
    client_api_key: str = Field(default="", validation_alias="CLIENT_API_KEY")

    wechat_app_id: str = Field(default="", validation_alias="WECHAT_APP_ID")
    wechat_app_secret: str = Field(default="", validation_alias="WECHAT_APP_SECRET")
    wechat_api_base_url: str = Field(
        default="https://api.weixin.qq.com",
        validation_alias="WECHAT_API_BASE_URL",
    )
    wechat_http_timeout_seconds: float = Field(
        default=5.0,
        validation_alias="WECHAT_HTTP_TIMEOUT_SECONDS",
    )

    cos_secret_id: str = Field(default="", validation_alias="COS_SECRET_ID")
    cos_secret_key: str = Field(default="", validation_alias="COS_SECRET_KEY")
    cos_region: str = Field(default="", validation_alias="COS_REGION")
    cos_bucket_message: str = Field(default="", validation_alias="COS_BUCKET_MESSAGE")
    cos_bucket_ava: str = Field(default="", validation_alias="COS_BUCKET_AVA")
    cos_public_base_url: str = Field(default="", validation_alias="COS_PUBLIC_BASE_URL")
    cos_message_prefix: str = Field(default="messages/audio/", validation_alias="COS_MESSAGE_PREFIX")
    cos_avatar_prefix: str = Field(default="avatars/", validation_alias="COS_AVATAR_PREFIX")
    cos_avatar_url_expire_seconds: int = Field(
        default=86400,
        validation_alias="COS_AVATAR_URL_EXPIRE_SECONDS",
    )
    cos_avatar_max_bytes: int = Field(
        default=2 * 1024 * 1024,
        validation_alias="COS_AVATAR_MAX_BYTES",
    )

    jwt_secret: str = Field(
        default="dev_only_change_jwt_secret",
        validation_alias="JWT_SECRET",
    )
    jwt_algorithm: str = Field(default="HS256", validation_alias="JWT_ALGORITHM")
    jwt_access_token_expire_minutes: int = Field(
        default=60,
        validation_alias="JWT_ACCESS_TOKEN_EXPIRE_MINUTES",
    )

    log_level: str = Field(default="INFO", validation_alias="LOG_LEVEL")
    log_json: bool = Field(default=False, validation_alias="LOG_JSON")
    slow_sql_ms: int = Field(default=200, validation_alias="SLOW_SQL_MS")

    @property
    def mysql_dsn(self) -> str:
        user = quote_plus(self.db_user)
        password = quote_plus(self.db_password)
        auth = f"{user}:{password}" if password else user
        return (
            f"mysql+pymysql://{auth}@{self.db_host}:{self.db_port}/"
            f"{self.db_name}?charset=utf8mb4"
        )


@lru_cache(maxsize=1)
def get_settings() -> Settings:
    return Settings()


settings = get_settings()