"""Task management routes for the kanban board."""

from typing import Optional
from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session

from app.database import get_db
from app.models import Task
from app.schemas import TaskCreate, TaskUpdate, TaskResponse, TaskListResponse

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


@router.post("", response_model=TaskResponse)
def create_task(task: TaskCreate, db: Session = Depends(get_db)):
    """Create a new task."""
    db_task = Task(**task.model_dump())
    db.add(db_task)
    db.commit()
    db.refresh(db_task)
    return db_task


@router.get("", response_model=TaskListResponse)
def list_tasks(
    status: Optional[str] = Query(None),
    priority: Optional[str] = Query(None),
    tags: Optional[str] = Query(None),
    search: Optional[str] = Query(None),
    db: Session = Depends(get_db),
):
    """List tasks with optional filtering."""
    query = db.query(Task)

    # Filter by status
    if status:
        query = query.filter(Task.status == status)

    # Filter by priority
    if priority:
        query = query.filter(Task.priority == priority)

    # Filter by tags (partial match)
    if tags:
        query = query.filter(Task.tags.ilike(f"%{tags}%"))

    # Search in title and description
    if search:
        query = query.filter(
            (Task.title.ilike(f"%{search}%")) | (Task.description.ilike(f"%{search}%"))
        )

    tasks = query.order_by(Task.created_at.desc()).all()
    return TaskListResponse(tasks=tasks, total=len(tasks))


@router.get("/{task_id}", response_model=TaskResponse)
def get_task(task_id: int, db: Session = Depends(get_db)):
    """Get a specific task by ID."""
    task = db.query(Task).filter(Task.id == task_id).first()
    if not task:
        raise HTTPException(status_code=404, detail="Task not found")
    return task


@router.put("/{task_id}", response_model=TaskResponse)
def update_task(task_id: int, task_update: TaskUpdate, db: Session = Depends(get_db)):
    """Update a task."""
    task = db.query(Task).filter(Task.id == task_id).first()
    if not task:
        raise HTTPException(status_code=404, detail="Task not found")

    # Update only provided fields
    update_data = task_update.model_dump(exclude_unset=True)
    for field, value in update_data.items():
        setattr(task, field, value)

    db.commit()
    db.refresh(task)
    return task


@router.delete("/{task_id}")
def delete_task(task_id: int, db: Session = Depends(get_db)):
    """Delete a task."""
    task = db.query(Task).filter(Task.id == task_id).first()
    if not task:
        raise HTTPException(status_code=404, detail="Task not found")

    db.delete(task)
    db.commit()
    return {"message": "Task deleted successfully"}