from fastapi import APIRouter, Depends, HTTPException, Path, status
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select

from app.database import get_db
from app.routers.auth import get_current_user
from app.models.user import User
from app.models.event_template import EventTemplate
from app.schemas.event_template import (
    EventTemplateCreate,
    EventTemplateUpdate,
    EventTemplateResponse,
)

router = APIRouter()


@router.get("/", response_model=list[EventTemplateResponse])
async def list_templates(
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    result = await db.execute(
        select(EventTemplate)
        .where(EventTemplate.user_id == current_user.id)
        .order_by(EventTemplate.name)
    )
    return result.scalars().all()


@router.post("/", response_model=EventTemplateResponse, status_code=status.HTTP_201_CREATED)
async def create_template(
    payload: EventTemplateCreate,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    template = EventTemplate(**payload.model_dump(), user_id=current_user.id)
    db.add(template)
    await db.commit()
    await db.refresh(template)
    return template


@router.put("/{template_id}", response_model=EventTemplateResponse)
async def update_template(
    template_id: int = Path(ge=1, le=2147483647),
    payload: EventTemplateUpdate = ...,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    result = await db.execute(
        select(EventTemplate).where(
            EventTemplate.id == template_id,
            EventTemplate.user_id == current_user.id,
        )
    )
    template = result.scalar_one_or_none()
    if template is None:
        raise HTTPException(status_code=404, detail="Template not found")

    for field, value in payload.model_dump(exclude_unset=True).items():
        setattr(template, field, value)

    await db.commit()
    await db.refresh(template)
    return template


@router.delete("/{template_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_template(
    template_id: int = Path(ge=1, le=2147483647),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    result = await db.execute(
        select(EventTemplate).where(
            EventTemplate.id == template_id,
            EventTemplate.user_id == current_user.id,
        )
    )
    template = result.scalar_one_or_none()
    if template is None:
        raise HTTPException(status_code=404, detail="Template not found")

    await db.delete(template)
    await db.commit()