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

from app.database import get_session
from app.auth import get_current_user

router = APIRouter()


def _row(r) -> dict:
    return dict(r._mapping)


@router.get("")
def list_lists(
    include_closed: bool = Query(default=False),
    session: Session = Depends(get_session),
    _: str = Depends(get_current_user),
) -> list[dict]:
    where = "" if include_closed else "WHERE l.closed_at IS NULL"
    order = "ORDER BY l.closed_at IS NOT NULL, l.created_at DESC" if include_closed else "ORDER BY l.created_at DESC"
    rows = session.execute(text(f"""
        SELECT
            l.*,
            COUNT(i.id)                          AS item_count,
            COUNT(i.id) FILTER (WHERE i.checked) AS checked_count
        FROM lk.lists l
        LEFT JOIN lk.list_items i ON i.list_id = l.id
        {where}
        GROUP BY l.id
        {order}
    """)).fetchall()
    return [_row(r) for r in rows]


@router.post("", status_code=201)
def create_list(
    body: dict[str, Any],
    session: Session = Depends(get_session),
    _: str = Depends(get_current_user),
) -> dict:
    row = session.execute(text("""
        INSERT INTO lk.lists (name, type, t_shirt_size, notes)
        VALUES (:name, :type, :t_shirt_size, :notes)
        RETURNING *
    """), {
        "name": body.get("name"),
        "type": body.get("type"),
        "t_shirt_size": body.get("t_shirt_size"),
        "notes": body.get("notes"),
    }).fetchone()
    session.commit()
    return _row(row)


@router.post("/{id}/close")
def close_list(
    id: int,
    session: Session = Depends(get_session),
    _: str = Depends(get_current_user),
) -> dict:
    result = session.execute(text("""
        UPDATE lk.lists SET status = 'closed', closed_at = now()
        WHERE id = :id RETURNING *
    """), {"id": id}).fetchone()
    session.commit()
    if result is None:
        raise HTTPException(status_code=404, detail="Not found")
    return _row(result)


@router.post("/{id}/reopen")
def reopen_list(
    id: int,
    session: Session = Depends(get_session),
    _: str = Depends(get_current_user),
) -> dict:
    result = session.execute(text("""
        UPDATE lk.lists SET status = 'open', closed_at = NULL
        WHERE id = :id RETURNING *
    """), {"id": id}).fetchone()
    session.commit()
    if result is None:
        raise HTTPException(status_code=404, detail="Not found")
    return _row(result)


@router.delete("/{id}", status_code=204)
def delete_list(
    id: int,
    session: Session = Depends(get_session),
    _: str = Depends(get_current_user),
):
    session.execute(text("DELETE FROM lk.lists WHERE id = :id"), {"id": id})
    session.commit()


@router.get("/{id}/items")
def list_items(
    id: int,
    session: Session = Depends(get_session),
    _: str = Depends(get_current_user),
) -> list[dict]:
    rows = session.execute(text("""
        SELECT * FROM lk.list_items WHERE list_id = :list_id ORDER BY position, created_at
    """), {"list_id": id}).fetchall()
    return [_row(r) for r in rows]


@router.post("/{id}/items", status_code=201)
def create_item(
    id: int,
    body: dict[str, Any],
    session: Session = Depends(get_session),
    _: str = Depends(get_current_user),
) -> dict:
    row = session.execute(text("""
        INSERT INTO lk.list_items (list_id, text) VALUES (:list_id, :text) RETURNING *
    """), {"list_id": id, "text": body.get("text")}).fetchone()
    session.commit()
    return _row(row)


@router.patch("/items/{id}")
def update_item_checked(
    id: int,
    body: dict[str, Any],
    session: Session = Depends(get_session),
    _: str = Depends(get_current_user),
) -> dict:
    result = session.execute(text("""
        UPDATE lk.list_items SET checked = :checked WHERE id = :id RETURNING *
    """), {"id": id, "checked": bool(body.get("checked", False))}).fetchone()
    session.commit()
    if result is None:
        raise HTTPException(status_code=404, detail="Not found")
    return _row(result)


@router.delete("/items/{id}", status_code=204)
def delete_item(
    id: int,
    session: Session = Depends(get_session),
    _: str = Depends(get_current_user),
):
    session.execute(text("DELETE FROM lk.list_items WHERE id = :id"), {"id": id})
    session.commit()