from uuid import UUID

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

from app.auth.dependencies import get_current_active_user
from app.db import get_db_session
from app.models.project import Project
from app.models.tool_instance import ToolInstance
from app.models.user import User
from app.schemas.tool_instance import ToolInstanceCreate, ToolInstanceRead, ToolInstanceUpdate

router = APIRouter(tags=["tool-instances"])


async def _get_project_for_user(
    project_id: UUID, user: User, session: AsyncSession
) -> Project:
    project = await session.get(Project, project_id)
    if not project or project.owner_id != user.id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Project not found")
    return project


@router.post("/projects/{project_id}/tool-instances", response_model=ToolInstanceRead, status_code=status.HTTP_201_CREATED)  # noqa: E501
async def create_tool_instance(
    project_id: UUID,
    ti_in: ToolInstanceCreate,
    current_user: User = Depends(get_current_active_user),
    session: AsyncSession = Depends(get_db_session),
) -> ToolInstance:
    await _get_project_for_user(project_id, current_user, session)
    ti = ToolInstance(**ti_in.model_dump(), project_id=project_id)
    session.add(ti)
    await session.commit()
    await session.refresh(ti)
    return ti


@router.get("/projects/{project_id}/tool-instances", response_model=list[ToolInstanceRead])
async def list_tool_instances(
    project_id: UUID,
    current_user: User = Depends(get_current_active_user),
    session: AsyncSession = Depends(get_db_session),
) -> list[ToolInstance]:
    await _get_project_for_user(project_id, current_user, session)
    result = await session.execute(
        select(ToolInstance).where(ToolInstance.project_id == project_id)
    )
    return list(result.scalars().all())


@router.get("/projects/{project_id}/tool-instances/{instance_id}", response_model=ToolInstanceRead)
async def get_tool_instance(
    project_id: UUID,
    instance_id: UUID,
    current_user: User = Depends(get_current_active_user),
    session: AsyncSession = Depends(get_db_session),
) -> ToolInstance:
    await _get_project_for_user(project_id, current_user, session)
    ti = await session.get(ToolInstance, instance_id)
    if not ti or ti.project_id != project_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Tool instance not found")
    return ti


@router.put("/projects/{project_id}/tool-instances/{instance_id}", response_model=ToolInstanceRead)
async def update_tool_instance(
    project_id: UUID,
    instance_id: UUID,
    ti_in: ToolInstanceUpdate,
    current_user: User = Depends(get_current_active_user),
    session: AsyncSession = Depends(get_db_session),
) -> ToolInstance:
    await _get_project_for_user(project_id, current_user, session)
    ti = await session.get(ToolInstance, instance_id)
    if not ti or ti.project_id != project_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Tool instance not found")
    update_data = ti_in.model_dump(exclude_unset=True)
    for field, value in update_data.items():
        setattr(ti, field, value)
    await session.commit()
    await session.refresh(ti)
    return ti


@router.delete("/projects/{project_id}/tool-instances/{instance_id}", status_code=status.HTTP_204_NO_CONTENT)  # noqa: E501
async def delete_tool_instance(
    project_id: UUID,
    instance_id: UUID,
    current_user: User = Depends(get_current_active_user),
    session: AsyncSession = Depends(get_db_session),
) -> None:
    await _get_project_for_user(project_id, current_user, session)
    ti = await session.get(ToolInstance, instance_id)
    if not ti or ti.project_id != project_id:
        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="Tool instance not found")
    await session.delete(ti)
    await session.commit()