"""Workflow definition CRUD API.

Endpoints:
  GET    /api/workflows/          — list all workflow definitions (admin/PM)
  GET    /api/workflows/{id}      — get single definition (admin/PM)
  POST   /api/workflows/          — create definition (admin only)
  PUT    /api/workflows/{id}      — update definition (admin only)
  DELETE /api/workflows/{id}      — delete definition (admin only)
  GET    /api/workflows/{id}/runs — list runs for a definition (admin/PM)
"""
import uuid

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

from app.database import get_db
from app.domains.auth.models import User
from app.utils.auth import get_current_user, require_admin, require_admin_or_pm
from app.domains.rendering.models import WorkflowDefinition, WorkflowRun
from app.domains.rendering.schemas import (
    WorkflowDefinitionCreate,
    WorkflowDefinitionUpdate,
    WorkflowDefinitionOut,
    WorkflowRunOut,
)

router = APIRouter(prefix="/api/workflows", tags=["workflows"])


@router.get("/", response_model=list[WorkflowDefinitionOut])
async def list_workflows(
    _user: User = Depends(require_admin_or_pm),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(WorkflowDefinition).order_by(WorkflowDefinition.created_at)
    )
    return result.scalars().all()


@router.get("/{workflow_id}", response_model=WorkflowDefinitionOut)
async def get_workflow(
    workflow_id: uuid.UUID,
    _user: User = Depends(require_admin_or_pm),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(WorkflowDefinition).where(WorkflowDefinition.id == workflow_id)
    )
    wf = result.scalar_one_or_none()
    if not wf:
        raise HTTPException(status_code=404, detail="Workflow definition not found")
    return wf


@router.post("/", response_model=WorkflowDefinitionOut, status_code=201)
async def create_workflow(
    body: WorkflowDefinitionCreate,
    _user: User = Depends(require_admin),
    db: AsyncSession = Depends(get_db),
):
    wf = WorkflowDefinition(
        name=body.name,
        output_type_id=body.output_type_id,
        config=body.config,
        is_active=body.is_active,
    )
    db.add(wf)
    await db.commit()
    await db.refresh(wf)
    return wf


@router.put("/{workflow_id}", response_model=WorkflowDefinitionOut)
async def update_workflow(
    workflow_id: uuid.UUID,
    body: WorkflowDefinitionUpdate,
    _user: User = Depends(require_admin),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(WorkflowDefinition).where(WorkflowDefinition.id == workflow_id)
    )
    wf = result.scalar_one_or_none()
    if not wf:
        raise HTTPException(status_code=404, detail="Workflow definition not found")

    if body.name is not None:
        wf.name = body.name
    if body.config is not None:
        wf.config = body.config
    if body.is_active is not None:
        wf.is_active = body.is_active

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


@router.delete("/{workflow_id}", status_code=204)
async def delete_workflow(
    workflow_id: uuid.UUID,
    _user: User = Depends(require_admin),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(WorkflowDefinition).where(WorkflowDefinition.id == workflow_id)
    )
    wf = result.scalar_one_or_none()
    if not wf:
        raise HTTPException(status_code=404, detail="Workflow definition not found")
    await db.delete(wf)
    await db.commit()


@router.get("/{workflow_id}/runs", response_model=list[WorkflowRunOut])
async def list_workflow_runs(
    workflow_id: uuid.UUID,
    _user: User = Depends(require_admin_or_pm),
    db: AsyncSession = Depends(get_db),
):
    # Verify the workflow exists
    wf_result = await db.execute(
        select(WorkflowDefinition).where(WorkflowDefinition.id == workflow_id)
    )
    if not wf_result.scalar_one_or_none():
        raise HTTPException(status_code=404, detail="Workflow definition not found")

    result = await db.execute(
        select(WorkflowRun)
        .where(WorkflowRun.workflow_def_id == workflow_id)
        .options(selectinload(WorkflowRun.node_results))
        .order_by(WorkflowRun.created_at.desc())
    )
    return result.scalars().all()