from typing import Any, Optional

from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session

from app import crud, schemas
from app.api import deps

router = APIRouter()


@router.get("/", response_model=schemas.anime.AnimeSearchResults)
def search_anime(
    *,
    db: Session = Depends(deps.get_db),
    title: Optional[str] = None,
    genre_id: Optional[int] = None,
    status: Optional[str] = None,
    year_from: Optional[int] = None,
    year_to: Optional[int] = None,
    score_min: Optional[float] = None,
    score_max: Optional[float] = None,
    source: Optional[str] = None,
    studio: Optional[str] = None,
    sort_by: Optional[str] = None,
    sort_order: Optional[str] = "asc",
    skip: int = 0,
    limit: int = 100,
) -> Any:
    """
    Search for anime with advanced filters.
    
    - **title**: Filter by title (partial match)
    - **genre_id**: Filter by genre ID
    - **status**: Filter by anime status (airing, finished, upcoming)
    - **year_from**: Filter by starting year (inclusive)
    - **year_to**: Filter by ending year (inclusive)
    - **score_min**: Filter by minimum score (inclusive)
    - **score_max**: Filter by maximum score (inclusive)
    - **source**: Filter by source material (manga, light novel, etc.)
    - **studio**: Filter by studio name (partial match)
    - **sort_by**: Sort by field (id, title, score, popularity, etc.)
    - **sort_order**: Sort order (asc, desc)
    - **skip**: Number of items to skip for pagination
    - **limit**: Maximum number of items to return
    """
    anime = crud.anime.search(
        db, 
        title=title, 
        genre_id=genre_id, 
        status=status,
        year_from=year_from,
        year_to=year_to,
        score_min=score_min,
        score_max=score_max,
        source=source,
        studio=studio,
        sort_by=sort_by,
        sort_order=sort_order,
        skip=skip, 
        limit=limit
    )
    
    total = crud.anime.search_count(
        db, 
        title=title, 
        genre_id=genre_id, 
        status=status,
        year_from=year_from,
        year_to=year_to,
        score_min=score_min,
        score_max=score_max,
        source=source,
        studio=studio
    )
    
    # Calculate pagination metadata
    page = skip // limit + 1 if limit > 0 else 1
    total_pages = (total + limit - 1) // limit if limit > 0 else 1
    has_next = page < total_pages
    has_prev = page > 1
    
    return {
        "results": anime,
        "total": total,
        "page": page,
        "size": limit,
        "pages": total_pages,
        "has_next": has_next,
        "has_prev": has_prev,
        "next_page": page + 1 if has_next else None,
        "prev_page": page - 1 if has_prev else None
    }


@router.post("/", response_model=schemas.anime.Anime)
def create_anime(
    *,
    db: Session = Depends(deps.get_db),
    anime_in: schemas.anime.AnimeCreate,
) -> Any:
    """
    Create new anime.
    """
    return crud.anime.create_with_genres(db=db, obj_in=anime_in)


@router.get("/{id}", response_model=schemas.anime.Anime)
def read_anime(
    *,
    db: Session = Depends(deps.get_db),
    id: int,
) -> Any:
    """
    Get anime by ID.
    """
    anime = crud.anime.get(db=db, id=id)
    if not anime:
        raise HTTPException(status_code=404, detail="Anime not found")
    return anime


@router.put("/{id}", response_model=schemas.anime.Anime)
def update_anime(
    *,
    db: Session = Depends(deps.get_db),
    id: int,
    anime_in: schemas.anime.AnimeUpdate,
) -> Any:
    """
    Update an anime.
    """
    anime = crud.anime.get(db=db, id=id)
    if not anime:
        raise HTTPException(status_code=404, detail="Anime not found")
    anime = crud.anime.update_with_genres(db=db, db_obj=anime, obj_in=anime_in)
    return anime


@router.delete("/{id}", response_model=None, status_code=204)
def delete_anime(
    *,
    db: Session = Depends(deps.get_db),
    id: int,
) -> Any:
    """
    Delete an anime.
    """
    anime = crud.anime.get(db=db, id=id)
    if not anime:
        raise HTTPException(status_code=404, detail="Anime not found")
    crud.anime.remove(db=db, id=id)
    return None


@router.get("/statistics", response_model=schemas.anime.AnimeStatistics)
def get_anime_statistics(
    db: Session = Depends(deps.get_db),
) -> Any:
    """
    Get statistics about the anime collection.
    
    Returns various statistical data including:
    - Total anime count
    - Average score and episode count
    - Distribution by status, source, and studio
    - Yearly distribution of releases
    - Score distribution
    - Top genres
    """
    return crud.anime.get_statistics(db=db)


@router.get("/search-by-character", response_model=schemas.anime.AnimeSearchResults)
def search_anime_by_character(
    *,
    db: Session = Depends(deps.get_db),
    character_name: Optional[str] = None,
    character_role: Optional[str] = None,
    character_gender: Optional[str] = None,
    include_anime_filters: bool = False,
    title: Optional[str] = None,
    genre_id: Optional[int] = None,
    status: Optional[str] = None,
    year_from: Optional[int] = None,
    year_to: Optional[int] = None,
    score_min: Optional[float] = None,
    score_max: Optional[float] = None,
    source: Optional[str] = None,
    studio: Optional[str] = None,
    sort_by: Optional[str] = None,
    sort_order: Optional[str] = "asc",
    skip: int = 0,
    limit: int = 100,
) -> Any:
    """
    Search for anime based on character attributes.
    
    - **character_name**: Filter anime by character name (partial match)
    - **character_role**: Filter anime by character role (e.g., "Main", "Supporting")
    - **character_gender**: Filter anime by character gender
    - **include_anime_filters**: Include anime filters below in the search
    
    Optional anime filters (if include_anime_filters is True):
    - **title**: Filter by anime title (partial match)
    - **genre_id**: Filter by genre ID
    - **status**: Filter by anime status (airing, finished, upcoming)
    - **year_from**: Filter by starting year (inclusive)
    - **year_to**: Filter by ending year (inclusive)
    - **score_min**: Filter by minimum score (inclusive)
    - **score_max**: Filter by maximum score (inclusive)
    - **source**: Filter by source material (manga, light novel, etc.)
    - **studio**: Filter by studio name (partial match)
    - **sort_by**: Sort by field (id, title, score, popularity, etc.)
    - **sort_order**: Sort order (asc, desc)
    
    Pagination parameters:
    - **skip**: Number of items to skip for pagination
    - **limit**: Maximum number of items to return
    """
    anime = crud.anime.search_by_character(
        db,
        character_name=character_name,
        character_role=character_role,
        character_gender=character_gender,
        include_anime_filters=include_anime_filters,
        title=title,
        genre_id=genre_id,
        status=status,
        year_from=year_from,
        year_to=year_to,
        score_min=score_min,
        score_max=score_max,
        source=source,
        studio=studio,
        sort_by=sort_by,
        sort_order=sort_order,
        skip=skip,
        limit=limit,
    )
    
    total = crud.anime.search_by_character_count(
        db,
        character_name=character_name,
        character_role=character_role,
        character_gender=character_gender,
        include_anime_filters=include_anime_filters,
        title=title,
        genre_id=genre_id,
        status=status,
        year_from=year_from,
        year_to=year_to,
        score_min=score_min,
        score_max=score_max,
        source=source,
        studio=studio,
    )
    
    # Calculate pagination metadata
    page = skip // limit + 1 if limit > 0 else 1
    total_pages = (total + limit - 1) // limit if limit > 0 else 1
    has_next = page < total_pages
    has_prev = page > 1
    
    return {
        "results": anime,
        "total": total,
        "page": page,
        "size": limit,
        "pages": total_pages,
        "has_next": has_next,
        "has_prev": has_prev,
        "next_page": page + 1 if has_next else None,
        "prev_page": page - 1 if has_prev else None
    }