from pathlib import Path
from typing import Any, Dict, List, Optional, Union
from uuid import UUID, uuid4

from loguru import logger
from pydantic import (
    BaseModel,
    DirectoryPath,
    Field,
    field_validator,
    ConfigDict,
    ValidationInfo,
)

from app.config.models.openai import OpenAIModelConfig
from app.config.models.vertexai import VertexAIModelConfig


def create_uuid() -> str:
    return str(uuid4())


class Document(BaseModel):
    """Interface for interacting with a document."""

    page_content: str
    metadata: dict = Field(default_factory=dict)


class SentenseTransformerEmbeddingModel(BaseModel):
    model_config = ConfigDict()
    model_config["protected_namespaces"] = ()
    model_name: str
    additional_kwargs: dict = Field(default_factory=dict)


class DocumentPathSettings(BaseModel):
    doc_path: Union[DirectoryPath, str]
    additional_parser_settings: Dict[str, Any] = Field(default_factory=dict)
    passage_prefix: str = ""
    label: str = ""  # Optional label, will be included in the metadata


class EmbedddingsSpladeConfig(BaseModel):
    n_batch: int = 3


class EmbeddingsConfig(BaseModel):
    model_config = ConfigDict(extra="forbid")

    embedding_model: SentenseTransformerEmbeddingModel
    embeddings_path: Union[DirectoryPath, str]
    document_settings: List[DocumentPathSettings]
    chunk_sizes: List[int] = [1024]
    splade_config: EmbedddingsSpladeConfig = EmbedddingsSpladeConfig(n_batch=5)

    @property
    def labels(self) -> List[str]:
        """Returns list of labels in document settings"""
        return [setting.label for setting in self.document_settings if setting.label]


class SemanticSearchConfig(BaseModel):
    model_config = ConfigDict(arbitrary_types_allowed=True, extra="forbid")
    max_k: int = 15
    max_char_size: int = 2048
    query_prefix: str = ""


class LLMConfig(BaseModel):
    model_config = ConfigDict(arbitrary_types_allowed=True, extra="forbid")
    model_config["protected_namespaces"] = ()

    type: str
    params: dict

    @field_validator("params")
    def validate_params(cls, value, info: ValidationInfo):
        values = info.data
        type_ = values.get("type")
        if type_ == 'vertexai':
            config = VertexAIModelConfig(
                **value
            )  # An attempt to force conversion to the required model config
        if type_ == 'openai':
            config = OpenAIModelConfig(
                **value
            )
        logger.info(
            f"Loading model paramaters in configuration class {LlamaModelConfig.__name__}"
        )
        return config


class ResponseModel(BaseModel):
    id: UUID = Field(default_factory=create_uuid)
    question: str
    response: str
    average_score: float
    semantic_search: List[str] = Field(default_factory=list)
    hyde_response: str = ""


class Config(BaseModel):
    cache_folder: Path
    embeddings: EmbeddingsConfig
    semantic_search: SemanticSearchConfig
    llm: Optional[LLMConfig] = None

    def check_embeddings_exist(self) -> bool:
        """Checks if embedings exist in the specified folder"""

        p_splade = (
                Path(self.embeddings.embeddings_path) / "splade" / "splade_embeddings.npz"
        )
        p_embeddings = Path(self.embeddings.embeddings_path)
        all_parquets = list(p_embeddings.glob("*.parquet"))
        return p_splade.exists() and len(all_parquets) > 0