from pathlib import Path
from pydantic_settings import BaseSettings, SettingsConfigDict
from typing import Literal


REPO_ROOT = Path(__file__).resolve().parents[2]
ENV_FILE = REPO_ROOT / ".env"


def _resolve_path(value: str) -> str:
    path = Path(value)
    if path.is_absolute():
        return str(path)
    return str((REPO_ROOT / path).resolve())


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

    # === 应用基础 ===
    APP_NAME: str = "Jarvis"
    APP_VERSION: str = "0.1.0"
    DEBUG: bool = False
    HOST: str = "127.0.0.1"
    PORT: int = 9527

    # === 安全 ===
    SECRET_KEY: str = "change-me-in-production"
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 60 * 24 * 7

    # === 数据库 ===
    DATABASE_URL: str = "sqlite+aiosqlite:///./data/jarvis.db"
    DATA_DIR: str = "data"

    # === ChromaDB ===
    CHROMA_PERSIST_DIR: str = "data/chroma"

    # === LLM 配置 ===
    # 支持: openai / claude / ollama / deepseek / custom
    LLM_PROVIDER: Literal["openai", "claude", "ollama", "deepseek", "custom"] = "openai"

    # OpenAI (默认)
    OPENAI_API_KEY: str = ""
    OPENAI_MODEL: str = "gpt-4o"
    OPENAI_BASE_URL: str = "https://api.openai.com/v1"

    # Claude
    ANTHROPIC_API_KEY: str = ""
    CLAUDE_MODEL: str = "claude-sonnet-4-20250514"
    CLAUDE_MAX_TOKENS: int = 8192

    # Ollama (本地模型)
    OLLAMA_BASE_URL: str = "http://localhost:11434"
    OLLAMA_MODEL: str = "llama3"

    # === 定时任务 ===
    SCHEDULER_ENABLED: bool = True
    DAILY_PLAN_TIME: str = "00:00"
    FORUM_SCAN_INTERVAL_MINUTES: int = 30

    # === CORS ===
    CORS_ORIGINS: list[str] = ["http://localhost:5173", "http://localhost:3000"]

    # === 文件上传 ===
    UPLOAD_DIR: str = "data/uploads"
    MAX_UPLOAD_SIZE: int = 50 * 1024 * 1024
    MINERU_LANGUAGE: Literal["ch", "en"] = "ch"

    # === 管理员 bootstrap ===
    ADMIN: str = ""
    ADMIN_EMAIL: str = ""
    ADMIN_PASSWORD: str = ""
    ADMIN_FULL_NAME: str = "Administrator"

    # === 向量化 ===
    EMBEDDING_MODEL: str = "text-embedding-3-small"
    EMBEDDING_BASE_URL: str = "https://api.openai.com/v1"
    EMBEDDING_API_KEY: str = ""
    CHUNK_SIZE: int = 500
    CHUNK_OVERLAP: int = 50

    # === LangSmith 可观测性 ===
    LANGSMITH_TRACING: bool = False
    LANGSMITH_API_KEY: str = ""
    LANGSMITH_PROJECT: str = "jarvis-agent"

    # === NAS 部署 ===
    NAS_DATA_ROOT: str = "/data/jarvis"

    # === Web Search / SearxNG ===
    WEB_SEARCH_ENABLED: bool = False
    WEB_SEARCH_PROVIDER: str = "searxng"
    SEARXNG_BASE_URL: str = ""
    SEARXNG_AUTH_TYPE: Literal["none", "bearer", "basic"] = "none"
    SEARXNG_AUTH_TOKEN: str = ""
    SEARXNG_BASIC_USER: str = ""
    SEARXNG_BASIC_PASSWORD: str = ""
    WEB_SEARCH_DEFAULT_LIMIT: int = 5
    WEB_SEARCH_TIMEOUT_SECONDS: int = 10


settings = Settings()
settings.DATABASE_URL = settings.DATABASE_URL.replace("./data", _resolve_path("./data"), 1)
settings.DATA_DIR = _resolve_path(settings.DATA_DIR)
settings.CHROMA_PERSIST_DIR = _resolve_path(settings.CHROMA_PERSIST_DIR)
settings.UPLOAD_DIR = _resolve_path(settings.UPLOAD_DIR)