import json
from importlib import metadata
from pathlib import Path
from uuid import uuid4

import lancedb
from lancedb.pydantic import LanceModel, Vector
from pydantic import Field
from rich.console import Console

from haiku.rag.config import Config
from haiku.rag.embeddings import get_embedder


class DocumentRecord(LanceModel):
    id: str = Field(default_factory=lambda: str(uuid4()))
    content: str
    uri: str | None = None
    metadata: str = Field(default="{}")
    created_at: str = Field(default_factory=lambda: "")
    updated_at: str = Field(default_factory=lambda: "")


def create_chunk_model(vector_dim: int):
    """Create a ChunkRecord model with the specified vector dimension."""

    class ChunkRecord(LanceModel):
        id: str = Field(default_factory=lambda: str(uuid4()))
        document_id: str
        content: str
        metadata: str = Field(default="{}")
        vector: Vector(vector_dim) = Field(default_factory=list)  # type: ignore

    return ChunkRecord


class SettingsRecord(LanceModel):
    id: str = Field(default="settings")
    settings: str = Field(default="{}")


class Store:
    def __init__(self, db_path: Path, skip_validation: bool = False):
        self.db_path: Path = db_path
        self.embedder = get_embedder()

        # Create the ChunkRecord model with the correct vector dimension
        self.ChunkRecord = create_chunk_model(self.embedder._vector_dim)

        # For file paths, create a LanceDB directory structure
        lance_path = str(db_path).replace(".sqlite", ".lancedb")
        self.db = lancedb.connect(lance_path)

        self.create_or_update_db()

        # Validate config compatibility after connection is established
        if not skip_validation:
            from haiku.rag.store.repositories.settings import (
                SettingsRepository,
            )

            settings_repo = SettingsRepository(self)
            settings_repo.validate_config_compatibility()

        current_version = metadata.version("haiku.rag")
        self.set_user_version(current_version)

    def create_or_update_db(self):
        """Create the database tables."""

        # Get list of existing tables
        existing_tables = self.db.table_names()

        # Create or get documents table
        if "documents" in existing_tables:
            self.documents_table = self.db.open_table("documents")
        else:
            self.documents_table = self.db.create_table(
                "documents", schema=DocumentRecord
            )

        # Create or get chunks table
        if "chunks" in existing_tables:
            self.chunks_table = self.db.open_table("chunks")
        else:
            self.chunks_table = self.db.create_table("chunks", schema=self.ChunkRecord)

        # Create or get settings table
        if "settings" in existing_tables:
            self.settings_table = self.db.open_table("settings")
        else:
            self.settings_table = self.db.create_table(
                "settings", schema=SettingsRecord
            )
            # Save current settings to the new database
            settings_data = Config.model_dump(mode="json")
            self.settings_table.add(
                [SettingsRecord(id="settings", settings=json.dumps(settings_data))]
            )

        # Check if we need to perform upgrades
        try:
            existing_settings = list(
                self.settings_table.search().limit(1).to_pydantic(SettingsRecord)
            )
            if existing_settings:
                console = Console()
                db_version = self.get_user_version()
                # Future: Add upgrade logic here similar to SQLite version
                console.print(
                    f"[green]LanceDB store initialized (version: {db_version})[/green]"
                )
        except Exception:
            pass

    def get_user_version(self) -> str:
        """Returns the user version stored in settings."""
        try:
            settings_records = list(
                self.settings_table.search().limit(1).to_pydantic(SettingsRecord)
            )
            if settings_records:
                settings = (
                    json.loads(settings_records[0].settings)
                    if settings_records[0].settings
                    else {}
                )
                return settings.get("version", "0.0.0")
        except Exception:
            pass
        return "0.0.0"

    def set_user_version(self, version: str) -> None:
        """Updates the user version in settings."""
        try:
            settings_records = list(
                self.settings_table.search().limit(1).to_pydantic(SettingsRecord)
            )
            if settings_records:
                settings = (
                    json.loads(settings_records[0].settings)
                    if settings_records[0].settings
                    else {}
                )
                settings["version"] = version
                # Update the record
                self.settings_table.update(
                    where="id = 1", values={"settings": json.dumps(settings)}
                )
            else:
                # Create new settings record
                settings_data = Config.model_dump(mode="json")
                settings_data["version"] = version
                self.settings_table.add(
                    [SettingsRecord(id="settings", settings=json.dumps(settings_data))]
                )
        except Exception:
            pass

    def recreate_embeddings_table(self) -> None:
        """Recreate the chunks table with current vector dimensions."""
        # Drop and recreate chunks table
        try:
            self.db.drop_table("chunks")
        except Exception:
            pass

        # Update the ChunkRecord model with new vector dimension
        self.ChunkRecord = create_chunk_model(self.embedder._vector_dim)
        self.chunks_table = self.db.create_table("chunks", schema=self.ChunkRecord)

    def close(self):
        """Close the database connection."""
        # LanceDB connections are automatically managed
        pass

    @property
    def _connection(self):
        """Compatibility property for repositories expecting _connection."""
        return self