#pragma once

#include <QPoint>
#include <QRectF>
#include <QVector2D>

// The coverage rules of a selection box (REQ-UI-MULTI-SELECT, REQ-BLD-DECONSTRUCT-BOX).
//
// The box is a rectangle in world coordinates — tiles as the unit, but fractional,
// because the drag follows the mouse and is not snapped to the tile grid. The two
// rules below are the whole of what "covered by the box" means; they live here so the
// building query and the entity queries answer it identically.
//
// Both callers pass a normalized rectangle: neither rule normalizes on its own.

// Whether the box overlaps the unit square of `tile` — the rule for anything that
// occupies whole tiles (buildings, construction sites, defence station bodies). The
// comparisons are inclusive, so a box that only grazes the tile's edge still covers
// it, and a box with no area covers the tile it lies on.
inline bool boxCoversTile(const QRectF& worldBox, QPoint tile)
{
    return worldBox.left() <= static_cast<qreal>(tile.x()) + 1.0
        && worldBox.right() >= static_cast<qreal>(tile.x())
        && worldBox.top() <= static_cast<qreal>(tile.y()) + 1.0
        && worldBox.bottom() >= static_cast<qreal>(tile.y());
}

// Whether the box contains `worldPos` — the rule for anything that has a position
// rather than a footprint (ships, debris). Their centre is what the box must enclose,
// so that what the rectangle visibly holds is what the drag selects.
inline bool boxCoversPoint(const QRectF& worldBox, QVector2D worldPos)
{
    return worldBox.contains(QPointF(worldPos.x(), worldPos.y()));
}