from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class PostgresSettings(BaseSettings):
    model_config = SettingsConfigDict(env_prefix="POSTGRES_", extra="ignore")

    host: str = "127.0.0.1"
    port: int = 5433
    user: str = "chatbot"
    password: str = "chatbot"
    db: str = "chatbot"

    @property
    def dsn(self) -> str:
        return f"postgresql+asyncpg://{self.user}:{self.password}@{self.host}:{self.port}/{self.db}"


class MinioSettings(BaseSettings):
    model_config = SettingsConfigDict(env_prefix="MINIO_", extra="ignore")

    endpoint: str = "127.0.0.1:9100"
    access_key: str = "chatbot"
    secret_key: str = "chatbot-secret"
    secure: bool = False
    bucket: str = "chatbot-source-files"


class IngestionSettings(BaseSettings):
    """Bounds on inline ingestion (ADR-0017).

    `timeout_seconds` must stay below the proxy/load-balancer/client read
    timeouts, or callers give up on work that is still succeeding.
    """

    model_config = SettingsConfigDict(env_prefix="INGESTION_", extra="ignore")

    max_concurrency: int = 4
    thread_pool_size: int = 8
    timeout_seconds: float = 120.0
    max_chunks_per_file: int = 5000
    embed_batch_size: int = 128
    embed_concurrency: int = 4


class QdrantSettings(BaseSettings):
    model_config = SettingsConfigDict(env_prefix="QDRANT_", extra="ignore")

    url: str = "http://127.0.0.1:6343"
    api_key: str | None = None


class AppLimitSettings(BaseSettings):
    model_config = SettingsConfigDict(env_prefix="APP_", extra="ignore")

    env: str = "local"
    max_upload_size_mb: int = 25
    readiness_check_timeout_seconds: float = 2.0


class LoggingSettings(BaseSettings):
    model_config = SettingsConfigDict(env_prefix="LOG_", extra="ignore")

    level: str = "INFO"
    json_format: bool = False


class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_file=".env", extra="ignore")

    postgres: PostgresSettings = Field(default_factory=PostgresSettings)
    minio: MinioSettings = Field(default_factory=MinioSettings)
    ingestion: IngestionSettings = Field(default_factory=IngestionSettings)
    qdrant: QdrantSettings = Field(default_factory=QdrantSettings)
    app: AppLimitSettings = Field(default_factory=AppLimitSettings)
    logging: LoggingSettings = Field(default_factory=LoggingSettings)