"""Pydantic-Schemas für API-Ein- und -Ausgabe."""
# SPDX-License-Identifier: Apache-2.0
from __future__ import annotations

from datetime import date, datetime
from typing import List, Literal, Optional

from pydantic import BaseModel, ConfigDict, Field


# ---------- Typen ------------------------------------------------------------

MediaKind = Literal["book", "series"]
MediaStatus = Literal["plan", "reading", "done", "hold", "dropped"]


# ---------- Eingaben ---------------------------------------------------------

class MediaBase(BaseModel):
    kind: MediaKind
    title: str = Field(..., max_length=200, min_length=1)
    original_title: Optional[str] = Field(None, max_length=200)
    description: Optional[str] = None
    cover_url: Optional[str] = Field(None, max_length=600)
    release_year: Optional[int] = Field(None, ge=1800, le=2200)
    status: MediaStatus = "plan"
    rating: Optional[float] = Field(None, ge=0, le=10)
    notes: Optional[str] = None

    # Buch-Felder
    author: Optional[str] = Field(None, max_length=200)
    isbn: Optional[str] = Field(None, max_length=20)
    total_volumes: Optional[int] = Field(None, ge=0)
    total_chapters: Optional[int] = Field(None, ge=0)
    total_pages: Optional[int] = Field(None, ge=0)
    volumes_read: Optional[int] = Field(None, ge=0)
    chapters_read: Optional[int] = Field(None, ge=0)
    pages_read: Optional[int] = Field(None, ge=0)

    # Serien-Felder
    network: Optional[str] = Field(None, max_length=120)
    total_seasons: Optional[int] = Field(None, ge=0)
    total_episodes: Optional[int] = Field(None, ge=0)
    episodes_watched: Optional[int] = Field(None, ge=0)
    season_watching: Optional[int] = Field(None, ge=0)
    start_date: Optional[date] = None
    end_date: Optional[date] = None

    genres: List[str] = []
    tags: List[str] = []


class MediaCreate(MediaBase):
    pass


class MediaUpdate(BaseModel):
    """Alle Felder optional – PATCH-Semantik."""
    title: Optional[str] = Field(None, max_length=200, min_length=1)
    original_title: Optional[str] = None
    description: Optional[str] = None
    cover_url: Optional[str] = None
    release_year: Optional[int] = None
    status: Optional[MediaStatus] = None
    rating: Optional[float] = Field(None, ge=0, le=10)
    notes: Optional[str] = None
    author: Optional[str] = None
    isbn: Optional[str] = None
    total_volumes: Optional[int] = None
    total_chapters: Optional[int] = None
    total_pages: Optional[int] = None
    volumes_read: Optional[int] = None
    chapters_read: Optional[int] = None
    pages_read: Optional[int] = None
    network: Optional[str] = None
    total_seasons: Optional[int] = None
    total_episodes: Optional[int] = None
    episodes_watched: Optional[int] = None
    season_watching: Optional[int] = None
    start_date: Optional[date] = None
    end_date: Optional[date] = None
    genres: Optional[List[str]] = None
    tags: Optional[List[str]] = None


class ProgressUpdate(BaseModel):
    """Schnelles Fortschritts-Update."""
    delta: int = 1
    set_to: Optional[int] = None  # wenn angegeben, setzt absolut


# ---------- Ausgaben ---------------------------------------------------------

class GenreOut(BaseModel):
    model_config = ConfigDict(from_attributes=True)
    id: int
    name: str


class TagOut(BaseModel):
    model_config = ConfigDict(from_attributes=True)
    id: int
    name: str


class MediaOut(BaseModel):
    model_config = ConfigDict(from_attributes=True)
    id: int
    kind: str
    title: str
    original_title: Optional[str]
    description: Optional[str]
    cover_url: Optional[str]
    release_year: Optional[int]
    status: str
    rating: Optional[float]
    notes: Optional[str]
    author: Optional[str]
    isbn: Optional[str]
    total_volumes: Optional[int]
    total_chapters: Optional[int]
    total_pages: Optional[int]
    volumes_read: Optional[int]
    chapters_read: Optional[int]
    pages_read: Optional[int]
    network: Optional[str]
    total_seasons: Optional[int]
    total_episodes: Optional[int]
    episodes_watched: Optional[int]
    season_watching: Optional[int]
    start_date: Optional[date]
    end_date: Optional[date]
    progress_percent: float
    genres: List[GenreOut]
    tags: List[TagOut]
    created_at: datetime
    updated_at: datetime


class StatsBucket(BaseModel):
    status: str
    count: int


class StatsPerKind(BaseModel):
    kind: str
    total: int
    avg_rating: Optional[float]
    by_status: List[StatsBucket]


class StatsResponse(BaseModel):
    books: StatsPerKind
    series: StatsPerKind
    total_entries: int