from datetime import datetime
from typing import TYPE_CHECKING, Optional

from pydantic import BaseModel, Field, validator

# Use forward references for type annotations
from app.schemas.genre import Genre

# Import types for type checking only
if TYPE_CHECKING:
    from app.schemas.author import Author
    from app.schemas.publisher import Publisher


# Shared properties
class MangaBase(BaseModel):
    title: str = Field(..., min_length=1, max_length=255, description="Title of the manga")
    original_title: str | None = Field(
        None, max_length=255, description="Original title in Japanese or other language"
    )
    isbn: str | None = Field(None, max_length=20, description="ISBN of the manga volume")
    description: str | None = Field(None, description="Description of the manga")
    volume_number: int | None = Field(None, ge=1, description="Volume number in the series")
    total_volumes: int | None = Field(
        None, ge=1, description="Total number of volumes in the series"
    )
    publication_date: datetime | None = Field(None, description="Publication date of the manga")
    page_count: int | None = Field(None, ge=1, description="Number of pages")
    price: float | None = Field(None, ge=0, description="Price of the manga")
    quantity: int = Field(0, ge=0, description="Quantity in inventory")
    in_stock: bool = Field(True, description="Whether the manga is in stock")
    rating: float | None = Field(None, ge=0, le=10, description="Rating of the manga (0-10)")
    language: str | None = Field(None, max_length=50, description="Language of the manga")
    cover_image_url: str | None = Field(None, max_length=255, description="URL to the cover image")

    @validator("total_volumes")
    def validate_total_volumes(self, v, values):
        if v is not None and "volume_number" in values and values["volume_number"] is not None:
            if v < values["volume_number"]:
                raise ValueError("Total volumes must be greater than or equal to volume number")
        return v


# Properties to receive on manga creation
class MangaCreate(MangaBase):
    author_id: int | None = Field(None, description="ID of the author")
    publisher_id: int | None = Field(None, description="ID of the publisher")
    genre_ids: list[int] | None = Field(None, description="IDs of the genres")


# Properties to receive on manga update
class MangaUpdate(MangaBase):
    title: str | None = Field(None, min_length=1, max_length=255, description="Title of the manga")
    author_id: int | None = Field(None, description="ID of the author")
    publisher_id: int | None = Field(None, description="ID of the publisher")
    genre_ids: list[int] | None = Field(None, description="IDs of the genres")


# Properties shared by models stored in DB
class MangaInDBBase(MangaBase):
    id: int
    author_id: int | None
    publisher_id: int | None
    created_at: datetime
    updated_at: datetime

    class Config:
        orm_mode = True


# Properties to return to client
class Manga(MangaInDBBase):
    pass


# Properties properties stored in DB
class MangaInDB(MangaInDBBase):
    pass


# Additional properties for response with relationships
class MangaWithRelations(Manga):
    author: Optional["Author"] = None
    publisher: Optional["Publisher"] = None
    genres: list[Genre] = []