"""
统一配置：所有环境变量通过此模块的 Settings 单点读取。
业务代码只允许 import settings，禁止散落 os.getenv() / load_dotenv()。
"""

import secrets

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        case_sensitive=False,
        extra="ignore",
    )

    # ── Database ──────────────────────────────────────────────
    database_url: str = "postgresql://postgres:postgres@localhost:5432/life_echo"

    # ── Redis ─────────────────────────────────────────────────
    redis_url: str = "redis://localhost:6379/0"
    redis_session_ttl: int = 86400

    # ── Auth / JWT ────────────────────────────────────────────
    secret_key: str = Field(default_factory=lambda: secrets.token_urlsafe(32))
    algorithm: str = "HS256"
    access_token_expire_minutes: int = 120
    refresh_token_expire_days: int = 30

    # ── LLM / DeepSeek ───────────────────────────────────────
    deepseek_api_key: str = ""
    deepseek_base_url: str = "https://api.deepseek.com"
    deepseek_model: str = "deepseek-chat"
    llm_api_key: str = ""
    llm_base_url: str = ""
    llm_model: str = ""
    llm_temperature: float = 0.7

    # ── ASR ───────────────────────────────────────────────────
    asr_provider: str = "whisper"
    asr_model_size: str = "small"
    asr_device: str = "auto"
    asr_compute_type: str = "auto"
    asr_model_cache_dir: str = ""

    # ── Tencent SMS ──────────────────────────────────────────
    tencent_sms_secret_id: str = ""
    tencent_sms_secret_key: str = ""
    tencent_sms_sdk_app_id: str = ""
    tencent_sms_sign_name: str = ""
    tencent_sms_template_id: str = ""
    tencent_sms_template_param_count: int = 2

    # ── Tencent ASR ──────────────────────────────────────────
    tencent_secret_id: str = ""
    tencent_secret_key: str = ""
    tencent_asr_app_id: str = ""

    # ── TTS (openai | tencent) ───────────────────────────────
    tts_provider: str = "tencent"
    openai_api_key: str = ""
    tts_voice_type: int = 603004  # Tencent 音色 ID，见 https://cloud.tencent.com/document/product/1073/92668
    tts_codec: str = "mp3"

    # ── WeChat Pay ───────────────────────────────────────────
    wechat_pay_app_id: str = ""
    wechat_pay_mch_id: str = ""
    wechat_pay_api_v3_key: str = ""
    wechat_pay_private_key_path: str = "certs/apiclient_key.pem"
    wechat_pay_private_key: str = ""  # PEM 内容，与 private_key_path 二选一
    wechat_pay_cert_serial_no: str = ""
    wechat_pay_notify_url: str = ""
    wechat_pay_platform_public_key: str = ""
    wechat_pay_platform_public_key_path: str = ""
    wechat_pay_platform_public_key_id: str = ""

    # ── Alipay ───────────────────────────────────────────────
    alipay_app_id: str = ""
    alipay_private_key: str = ""
    alipay_public_key: str = ""
    alipay_notify_url: str = ""
    alipay_sign_type: str = "RSA2"
    alipay_under_development: str = "true"  # "1"/"true"/"yes" 视为开发中不可用

    # ── Misc ─────────────────────────────────────────────────
    enable_test_subscription: int = 0
    enable_test_plan: str = ""  # "1" / "true" / "yes" 为 True
    enable_docs: bool = True
    migration_database_url: str = ""  # 脚本迁移用，空则用 database_url

    # ── Memoir Image ─────────────────────────────────────────
    memoir_image_enabled: bool = False
    memoir_image_max_per_chapter: int = 2
    memoir_image_poll_interval: int = 3
    memoir_image_max_attempts: int = 20
    memoir_image_chars_per_extra: int = 1500
    memoir_image_max_cap: int = 8
    memoir_image_provider: str = "liblib"
    memoir_image_style_default: str = "watercolor"
    memoir_image_size_default: str = "1280x720"
    memoir_image_download_hosts: str = ""

    # ── Liblib ───────────────────────────────────────────────
    liblib_access_key: str = ""
    liblib_secret_key: str = ""
    liblib_base_url: str = "https://openapi.liblibai.cloud"
    liblib_template_uuid: str = ""

    # ── Tencent COS ──────────────────────────────────────────
    tencent_cos_secret_id: str = ""
    tencent_cos_secret_key: str = ""
    tencent_cos_region: str = "ap-shanghai"
    tencent_cos_bucket: str = ""
    tencent_cos_base_url: str = ""
    tencent_cos_token: str = ""


settings = Settings()