import asyncio
import logging
from typing import Any, AsyncGenerator
from uuid import UUID

from core.base import AsyncState, KGExtraction, R2RDocumentProcessingError
from core.base.pipes.base_pipe import AsyncPipe
from core.database import PostgresDatabaseProvider

logger = logging.getLogger()


class GraphStoragePipe(AsyncPipe):
    # TODO - Apply correct type hints to storage messages
    class Input(AsyncPipe.Input):
        message: AsyncGenerator[list[Any], None]

    def __init__(
        self,
        database_provider: PostgresDatabaseProvider,
        config: AsyncPipe.PipeConfig,
        storage_batch_size: int = 1,
        *args,
        **kwargs,
    ):
        """
        Initializes the async knowledge graph storage pipe with necessary components and configurations.
        """
        logger.info(
            f"Initializing an `GraphStoragePipe` to store knowledge graph extractions in a graph database."
        )

        super().__init__(
            config,
            *args,
            **kwargs,
        )
        self.database_provider = database_provider
        self.storage_batch_size = storage_batch_size

    async def store(
        self,
        kg_extractions: list[KGExtraction],
    ):
        """
        Stores a batch of knowledge graph extractions in the graph database.
        """

        total_entities, total_relationships = 0, 0

        for extraction in kg_extractions:
            total_entities, total_relationships = (
                total_entities + len(extraction.entities),
                total_relationships + len(extraction.relationships),
            )

            if extraction.entities:
                if not extraction.entities[0].chunk_ids:
                    for i in range(len(extraction.entities)):
                        extraction.entities[i].chunk_ids = extraction.chunk_ids
                        extraction.entities[i].parent_id = (
                            extraction.document_id
                        )

                for entity in extraction.entities:
                    await self.database_provider.graphs_handler.entities.create(
                        **entity.to_dict()
                    )

            if extraction.relationships:
                if not extraction.relationships[0].chunk_ids:
                    for i in range(len(extraction.relationships)):
                        extraction.relationships[i].chunk_ids = (
                            extraction.chunk_ids
                        )
                    extraction.relationships[i].document_id = (
                        extraction.document_id
                    )

                await self.database_provider.graphs_handler.relationships.create(
                    extraction.relationships,
                )

            return (total_entities, total_relationships)

    async def _run_logic(  # type: ignore
        self,
        input: Input,
        state: AsyncState,
        run_id: UUID,
        *args: Any,
        **kwargs: Any,
    ) -> AsyncGenerator[list[R2RDocumentProcessingError], None]:
        """
        Executes the async knowledge graph storage pipe: storing knowledge graph extractions in the graph database.
        """

        batch_tasks = []
        kg_batch: list[KGExtraction] = []
        errors = []

        async for kg_extraction in input.message:
            if isinstance(kg_extraction, R2RDocumentProcessingError):
                errors.append(kg_extraction)
                continue

            kg_batch.append(kg_extraction)  # type: ignore
            if len(kg_batch) >= self.storage_batch_size:
                # Schedule the storage task
                batch_tasks.append(
                    asyncio.create_task(
                        self.store(kg_batch.copy()),
                        name=f"kg-store-{self.config.name}",
                    )
                )
                kg_batch.clear()

        if kg_batch:  # Process any remaining extractions
            batch_tasks.append(
                asyncio.create_task(
                    self.store(kg_batch.copy()),
                    name=f"kg-store-{self.config.name}",
                )
            )

        # Wait for all storage tasks to complete
        await asyncio.gather(*batch_tasks)

        for error in errors:
            yield error