"""
API Routes para gestión de Posts.
"""

from datetime import datetime
from typing import List, Optional
from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session
from pydantic import BaseModel

from app.core.database import get_db
from app.models.post import Post

router = APIRouter()


# ===========================================
# SCHEMAS
# ===========================================

class PostCreate(BaseModel):
    content: str
    content_type: str
    platforms: List[str]
    scheduled_at: Optional[datetime] = None
    image_url: Optional[str] = None
    approval_required: bool = False
    hashtags: Optional[List[str]] = None

    class Config:
        from_attributes = True


class PostUpdate(BaseModel):
    content: Optional[str] = None
    content_x: Optional[str] = None
    content_threads: Optional[str] = None
    content_instagram: Optional[str] = None
    content_facebook: Optional[str] = None
    platforms: Optional[List[str]] = None
    scheduled_at: Optional[datetime] = None
    status: Optional[str] = None
    image_url: Optional[str] = None
    hashtags: Optional[List[str]] = None

    class Config:
        from_attributes = True


class PostResponse(BaseModel):
    id: int
    content: str
    content_type: str
    platforms: List[str]
    status: str
    scheduled_at: Optional[datetime]
    published_at: Optional[datetime]
    image_url: Optional[str]
    approval_required: bool
    created_at: datetime

    class Config:
        from_attributes = True


# ===========================================
# ENDPOINTS
# ===========================================

@router.get("/", response_model=List[PostResponse])
async def list_posts(
    status: Optional[str] = Query(None, description="Filtrar por estado"),
    content_type: Optional[str] = Query(None, description="Filtrar por tipo"),
    platform: Optional[str] = Query(None, description="Filtrar por plataforma"),
    limit: int = Query(50, le=100),
    offset: int = Query(0),
    db: Session = Depends(get_db)
):
    """Listar posts con filtros opcionales."""
    query = db.query(Post)

    if status:
        query = query.filter(Post.status == status)
    if content_type:
        query = query.filter(Post.content_type == content_type)
    if platform:
        query = query.filter(Post.platforms.contains([platform]))

    posts = query.order_by(Post.created_at.desc()).offset(offset).limit(limit).all()
    return posts


@router.get("/pending")
async def list_pending_posts(db: Session = Depends(get_db)):
    """Listar posts pendientes de aprobación."""
    posts = db.query(Post).filter(
        Post.status == "pending_approval"
    ).order_by(Post.scheduled_at.asc()).all()

    return [post.to_dict() for post in posts]


@router.get("/scheduled")
async def list_scheduled_posts(db: Session = Depends(get_db)):
    """Listar posts programados."""
    posts = db.query(Post).filter(
        Post.status == "scheduled",
        Post.scheduled_at >= datetime.utcnow()
    ).order_by(Post.scheduled_at.asc()).all()

    return [post.to_dict() for post in posts]


@router.get("/{post_id}")
async def get_post(post_id: int, db: Session = Depends(get_db)):
    """Obtener un post por ID."""
    post = db.query(Post).filter(Post.id == post_id).first()
    if not post:
        raise HTTPException(status_code=404, detail="Post no encontrado")
    return post.to_dict()


@router.post("/", response_model=PostResponse)
async def create_post(post_data: PostCreate, db: Session = Depends(get_db)):
    """Crear un nuevo post."""
    post = Post(
        content=post_data.content,
        content_type=post_data.content_type,
        platforms=post_data.platforms,
        scheduled_at=post_data.scheduled_at,
        image_url=post_data.image_url,
        approval_required=post_data.approval_required,
        hashtags=post_data.hashtags,
        status="pending_approval" if post_data.approval_required else "scheduled"
    )

    db.add(post)
    db.commit()
    db.refresh(post)

    return post


@router.put("/{post_id}")
async def update_post(post_id: int, post_data: PostUpdate, db: Session = Depends(get_db)):
    """Actualizar un post."""
    post = db.query(Post).filter(Post.id == post_id).first()
    if not post:
        raise HTTPException(status_code=404, detail="Post no encontrado")

    update_data = post_data.dict(exclude_unset=True)
    for field, value in update_data.items():
        setattr(post, field, value)

    post.updated_at = datetime.utcnow()
    db.commit()
    db.refresh(post)

    return post.to_dict()


@router.post("/{post_id}/approve")
async def approve_post(post_id: int, db: Session = Depends(get_db)):
    """Aprobar un post pendiente."""
    post = db.query(Post).filter(Post.id == post_id).first()
    if not post:
        raise HTTPException(status_code=404, detail="Post no encontrado")

    if post.status != "pending_approval":
        raise HTTPException(status_code=400, detail="El post no está pendiente de aprobación")

    post.status = "scheduled"
    post.approved_at = datetime.utcnow()
    db.commit()

    return {"message": "Post aprobado", "post_id": post_id}


@router.post("/{post_id}/reject")
async def reject_post(post_id: int, db: Session = Depends(get_db)):
    """Rechazar un post pendiente."""
    post = db.query(Post).filter(Post.id == post_id).first()
    if not post:
        raise HTTPException(status_code=404, detail="Post no encontrado")

    post.status = "cancelled"
    db.commit()

    return {"message": "Post rechazado", "post_id": post_id}


@router.post("/{post_id}/regenerate")
async def regenerate_post(post_id: int, db: Session = Depends(get_db)):
    """Regenerar contenido de un post con IA."""
    post = db.query(Post).filter(Post.id == post_id).first()
    if not post:
        raise HTTPException(status_code=404, detail="Post no encontrado")

    # TODO: Implementar regeneración con DeepSeek
    # from app.services.content_generator import regenerate_content
    # new_content = await regenerate_content(post)

    return {"message": "Regeneración en desarrollo", "post_id": post_id}


@router.delete("/{post_id}")
async def delete_post(post_id: int, db: Session = Depends(get_db)):
    """Eliminar un post."""
    post = db.query(Post).filter(Post.id == post_id).first()
    if not post:
        raise HTTPException(status_code=404, detail="Post no encontrado")

    db.delete(post)
    db.commit()

    return {"message": "Post eliminado", "post_id": post_id}