#pragma once

#include "Layout.h"

#include <QRectF>
#include <QSizeF>

struct KeyboardMetrics {
    qreal padding = 6;      // around the whole keyboard
    qreal gap = 8;          // between keys, horizontally and vertically
    qreal blockGap = 24;    // between side-by-side blocks (main, navigation, numpad)
};

// The keys on screen: blocks of rows, side by side.
struct Block {
    QList<Row> rows;
    bool fillHeight = false; // rows grow to span the full height instead of sharing the row height
};

// Lays out blocks to fill `size`. Returns one rect per key, block by block in
// row order (spacers included). One key unit has the same width everywhere;
// rows share one height, set by the tallest block that doesn't fill, and
// shorter blocks sit at the bottom. In each block, stretch keys grow to make
// their row as wide as the widest one, and remaining shorter rows are centered.
QList<QRectF> computeKeyRects(const QList<Block> &blocks, QSizeF size, KeyboardMetrics metrics = {});
inline QList<QRectF> computeKeyRects(const Layer &layer, QSizeF size, KeyboardMetrics metrics = {})
{
    return computeKeyRects({{layer.rows}}, size, metrics);
}

// Total width of a row in key units, before stretching.
qreal rowUnits(const Row &row);
// Width of all blocks in key units, ignoring gaps.
qreal totalUnits(const QList<Block> &blocks);
// Rows of the tallest block that sets the row height (see computeKeyRects).
qsizetype totalRows(const QList<Block> &blocks);