import json
from dataclasses import dataclass
from datetime import datetime
from enum import Enum
from typing import Any, Optional
from uuid import UUID

from pydantic import Field

from .base import R2RSerializable


class Entity(R2RSerializable):
    """An entity extracted from a document."""

    name: str
    description: Optional[str] = None
    category: Optional[str] = None
    metadata: Optional[dict[str, Any] | str] = None

    id: Optional[UUID] = None
    parent_id: Optional[UUID] = None  # graph_id | document_id
    description_embedding: Optional[list[float] | str] = None
    chunk_ids: Optional[list[UUID]] = []

    def __str__(self):
        return f"{self.name}:{self.category}"

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        if isinstance(self.metadata, str):
            try:
                self.metadata = json.loads(self.metadata)
            except json.JSONDecodeError:
                self.metadata = self.metadata


class Relationship(R2RSerializable):
    """A relationship between two entities. This is a generic relationship, and can be used to represent any type of relationship between any two entities."""

    id: Optional[UUID] = None
    subject: str
    predicate: str
    object: str
    description: str | None = None
    subject_id: Optional[UUID] = None
    object_id: Optional[UUID] = None
    weight: float | None = 1.0
    chunk_ids: Optional[list[UUID]] = []
    parent_id: Optional[UUID] = None
    description_embedding: Optional[list[float] | str] = None

    metadata: Optional[dict[str, Any] | str] = None

    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        if isinstance(self.metadata, str):
            try:
                self.metadata = json.loads(self.metadata)
            except json.JSONDecodeError:
                self.metadata = self.metadata


@dataclass
class Community(R2RSerializable):
    name: str = ""
    summary: str = ""

    level: Optional[int] = None
    findings: list[str] = []
    id: Optional[int | UUID] = None
    community_id: Optional[UUID] = None
    collection_id: Optional[UUID] = None
    rating: float | None = None
    rating_explanation: str | None = None
    description_embedding: list[float] | None = None
    attributes: dict[str, Any] | None = None
    created_at: datetime = Field(
        default_factory=datetime.utcnow,
    )
    updated_at: datetime = Field(
        default_factory=datetime.utcnow,
    )

    def __init__(self, **kwargs):
        if isinstance(kwargs.get("attributes", None), str):
            kwargs["attributes"] = json.loads(kwargs["attributes"])

        if isinstance(kwargs.get("embedding", None), str):
            kwargs["embedding"] = json.loads(kwargs["embedding"])

        super().__init__(**kwargs)

    @classmethod
    def from_dict(cls, data: dict[str, Any] | str) -> "Community":
        parsed_data: dict[str, Any] = (
            json.loads(data) if isinstance(data, str) else data
        )
        if isinstance(parsed_data.get("embedding", None), str):
            parsed_data["embedding"] = json.loads(parsed_data["embedding"])
        return cls(**parsed_data)


class KGExtraction(R2RSerializable):
    """A protocol for a knowledge graph extraction."""

    entities: list[Entity]
    relationships: list[Relationship]


class Graph(R2RSerializable):
    id: UUID | None = Field()
    name: str
    description: Optional[str] = None
    created_at: datetime = Field(
        default_factory=datetime.utcnow,
    )
    updated_at: datetime = Field(
        default_factory=datetime.utcnow,
    )
    status: str = "pending"

    class Config:
        populate_by_name = True
        from_attributes = True

    @classmethod
    def from_dict(cls, data: dict[str, Any] | str) -> "Graph":
        """Create a Graph instance from a dictionary."""
        # Convert string to dict if needed
        parsed_data: dict[str, Any] = (
            json.loads(data) if isinstance(data, str) else data
        )
        return cls(**parsed_data)

    def __init__(self, **kwargs):
        super().__init__(**kwargs)


class StoreType(str, Enum):
    GRAPHS = "graphs"
    DOCUMENTS = "documents"