from pydantic import Field, field_validator
from pydantic_settings import BaseSettings, SettingsConfigDict


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

    app_env: str = Field(default="development", validation_alias="GEOINTEL_ENV")
    app_version: str = Field(default="0.1.0")
    api_prefix: str = Field(default="/api/v1", validation_alias="GEOINTEL_API_PREFIX")
    database_url: str = Field(
        default="postgresql+psycopg://geointel:geointel@localhost:5432/geointel?connect_timeout=1",
        validation_alias="DATABASE_URL",
    )
    storage_root: str = Field(default="./storage", validation_alias="STORAGE_ROOT")
    max_upload_mb: int = Field(default=500, validation_alias="MAX_UPLOAD_MB")
    orthophoto_enabled: bool = Field(default=True, validation_alias="ORTHOPHOTO_ENABLED")
    orthophoto_wms_url: str = Field(
        default="https://geo.api.vlaanderen.be/OMWRGBMRVL/wms",
        validation_alias="ORTHOPHOTO_WMS_URL",
    )
    orthophoto_wms_layer: str = Field(default="Ortho", validation_alias="ORTHOPHOTO_WMS_LAYER")
    orthophoto_resolution_m: float = Field(default=1.0, gt=0, validation_alias="ORTHOPHOTO_RESOLUTION_M")
    orthophoto_min_side_m: float = Field(default=128.0, gt=0, validation_alias="ORTHOPHOTO_MIN_SIDE_M")
    orthophoto_max_side_m: float = Field(default=1024.0, gt=0, validation_alias="ORTHOPHOTO_MAX_SIDE_M")
    orthophoto_timeout_seconds: int = Field(default=120, ge=1, validation_alias="ORTHOPHOTO_TIMEOUT_SECONDS")
    orthophoto_max_response_mb: int = Field(default=32, ge=1, validation_alias="ORTHOPHOTO_MAX_RESPONSE_MB")
    orthophoto_cache_ttl_hours: int = Field(default=24, ge=0, validation_alias="ORTHOPHOTO_CACHE_TTL_HOURS")
    redis_url: str | None = Field(default=None, validation_alias="REDIS_URL")
    log_level: str = Field(default="INFO", validation_alias="GEOINTEL_LOG_LEVEL")
    database_statement_timeout_ms: int = Field(default=5_000, validation_alias="DATABASE_STATEMENT_TIMEOUT_MS")
    yolo_enabled: bool = Field(default=False, validation_alias="YOLO_ENABLED")
    yolo_models_dir: str = Field(default="/app/models", validation_alias="YOLO_MODELS_DIR")
    yolo_model_path: str | None = Field(default=None, validation_alias="YOLO_MODEL_PATH")
    yolo_model_id: str = Field(default="yolo-configured", validation_alias="YOLO_MODEL_ID")
    yolo_model_display_name: str = Field(default="Configured YOLO detector", validation_alias="YOLO_MODEL_DISPLAY_NAME")
    yolo_model_version: str | None = Field(default=None, validation_alias="YOLO_MODEL_VERSION")
    yolo_device: str = Field(default="cpu", validation_alias="YOLO_DEVICE")
    yolo_image_size: int = Field(default=640, validation_alias="YOLO_IMAGE_SIZE")
    yolo_max_tiles: int = Field(default=100, validation_alias="YOLO_MAX_TILES")
    yolo_max_detections: int = Field(default=1000, validation_alias="YOLO_MAX_DETECTIONS")
    yolo_duplicate_iou_threshold: float = Field(default=0.5, ge=0.0, le=1.0, validation_alias="YOLO_DUPLICATE_IOU_THRESHOLD")
    yolo_batch_size: int = Field(default=1, validation_alias="YOLO_BATCH_SIZE")
    ollama_enabled: bool = Field(default=False, validation_alias="OLLAMA_ENABLED")
    ollama_base_url: str = Field(default="http://127.0.0.1:11434", validation_alias="OLLAMA_BASE_URL")
    ollama_default_model: str = Field(default="qwen3.5:9b", validation_alias="OLLAMA_DEFAULT_MODEL")
    ollama_timeout_seconds: int = Field(default=120, ge=5, le=600, validation_alias="OLLAMA_TIMEOUT_SECONDS")
    ollama_max_output_tokens: int = Field(default=700, ge=100, le=4_000, validation_alias="OLLAMA_MAX_OUTPUT_TOKENS")
    ollama_context_tokens: int = Field(default=16_384, ge=4_096, le=131_072, validation_alias="OLLAMA_CONTEXT_TOKENS")
    cors_origins: list[str] | str = Field(
        default=["http://localhost:5173", "http://127.0.0.1:5173"],
        validation_alias="CORS_ORIGINS",
    )

    @field_validator("cors_origins", mode="before")
    @classmethod
    def parse_cors_origins(cls, value: object) -> list[str]:
        if isinstance(value, str):
            return [item.strip() for item in value.split(",") if item.strip()]
        if isinstance(value, list):
            return value
        if value is None:
            return ["http://localhost:5173", "http://127.0.0.1:5173"]
        return [str(value)]

    @field_validator("ollama_base_url")
    @classmethod
    def validate_ollama_base_url(cls, value: str) -> str:
        normalized = value.strip().rstrip("/")
        if not normalized.startswith(("http://", "https://")):
            raise ValueError("OLLAMA_BASE_URL must use http or https")
        return normalized


def get_settings() -> Settings:
    return Settings()