"""
Evaluation API Router
"""
from typing import List, Optional
from uuid import UUID
from pydantic import BaseModel
from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from app.core.database import get_db
from app.models.models import EvalDataset, Task
from app.schemas.base import EvalDatasetCreate, EvalDatasetResponse, TaskResponse

router = APIRouter()


class GenerateEvalRequest(BaseModel):
    """Request for generating evaluation dataset"""
    name: str
    question_type: str = "mixed"
    count: int = 50


class RunEvalRequest(BaseModel):
    """Request for running evaluation"""
    model_config_id: Optional[UUID] = None


@router.get("/", response_model=dict)
async def list_eval_datasets(project_id: UUID, db: AsyncSession = Depends(get_db)):
    """List evaluation datasets"""
    result = await db.execute(
        select(EvalDataset).where(EvalDataset.project_id == project_id).order_by(EvalDataset.created_at.desc())
    )
    datasets = result.scalars().all()

    return {"datasets": [EvalDatasetResponse.model_validate(d) for d in datasets]}


@router.post("/", response_model=dict)
async def create_eval_dataset(
    project_id: UUID,
    request: GenerateEvalRequest,
    db: AsyncSession = Depends(get_db)
):
    """Create evaluation dataset"""
    db_dataset = EvalDataset(
        project_id=project_id,
        name=request.name,
        question_type=request.question_type
    )
    db.add(db_dataset)
    await db.commit()
    await db.refresh(db_dataset)

    return {"id": str(db_dataset.id)}


@router.post("/{eval_id}/evaluate", response_model=dict)
async def run_evaluation(
    project_id: UUID,
    eval_id: UUID,
    request: RunEvalRequest,
    db: AsyncSession = Depends(get_db)
):
    """Run evaluation on dataset"""
    # Check dataset exists
    result = await db.execute(
        select(EvalDataset).where(EvalDataset.id == eval_id, EvalDataset.project_id == project_id)
    )
    dataset = result.scalar_one_or_none()
    if not dataset:
        raise HTTPException(status_code=404, detail="Evaluation dataset not found")

    # Create evaluation task
    task = Task(
        project_id=project_id,
        task_type="eval",
        status="pending"
    )
    db.add(task)
    await db.commit()
    await db.refresh(task)

    # TODO: Start evaluation in background

    return {"task_id": str(task.id), "message": "Evaluation task started"}


@router.get("/results", response_model=dict)
async def get_eval_results(project_id: UUID, task_id: UUID, db: AsyncSession = Depends(get_db)):
    """Get evaluation results"""
    result = await db.execute(
        select(Task).where(Task.id == task_id, Task.project_id == project_id)
    )
    task = result.scalar_one_or_none()
    if not task:
        raise HTTPException(status_code=404, detail="Task not found")

    return TaskResponse.model_validate(task)