#include "TableTemplate.hpp"

bool TableCell::IsPrimaryCell() const
{
	return PrimaryCellLocation == Location;
}

bool TableCell::IsMergedCell() const
{
	return PrimaryCellLocation.x == -1 || PrimaryCellLocation.y == -1;
}

int TableTemplate::GetTableWidth() const
{
	return mTableWidth;
}

int TableTemplate::GetTableHeight() const
{
	return mTableHeight;
}

void TableTemplate::Resize(int newWidth, int newHeight)
{
	// TODO this doesn't gracefully handle resizing to a smaller size which trims some merged cells

	std::vector<TableCell> cells;
	cells.reserve(newWidth * newHeight);

	int yEnd = std::min(mTableHeight, newHeight);
	int xEnd = std::min(mTableWidth, newWidth);
	for (int y = 0; y < yEnd; ++y) {
		if (y >= mTableHeight) {
			for (int x = 0; x < xEnd; ++x) {
				cells.push_back(TableCell{});
			}
			continue;
		}

		for (int x = 0; x < xEnd; ++x) {
			if (x >= mTableWidth) {
				cells.push_back(TableCell{});
			} else {
				auto& cell = GetCell({ x, y });
				cells.push_back(std::move(cell));
			}
		}
	}

	mCells = std::move(cells);
}

const TableCell& TableTemplate::GetCell(Vec2i pos) const
{
	return mCells[pos.y * mTableWidth + pos.x];
}

TableCell& TableTemplate::GetCell(Vec2i pos)
{
	return const_cast<TableCell&>(const_cast<const TableTemplate*>(this)->GetCell(pos));
}

TableTemplate::MergeCellsResult TableTemplate::MergeCells(Vec2i topLeft, Vec2i bottomRight)
{
	auto SortTwo = [](int& a, int& b) {
		if (a > b) {
			std::swap(a, b);
		}
	};
	SortTwo(topLeft.x, bottomRight.x);
	SortTwo(topLeft.y, bottomRight.y);

	auto ResetProgress = [&]() {
		for (int y = topLeft.y; y < bottomRight.y; ++y) {
			for (int x = topLeft.x; x < bottomRight.x; ++x) {
				auto& cell = GetCell({ x, y });
				cell.PrimaryCellLocation = { -1, -1 };
			}
		}
	};

	for (int y = topLeft.y; y < bottomRight.y; ++y) {
		for (int x = topLeft.x; x < bottomRight.x; ++x) {
			auto& cell = GetCell({ x, y });
			if (cell.IsMergedCell()) {
				ResetProgress();
				return MCR_CellAlreadyMerged;
			}

			cell.PrimaryCellLocation = topLeft;
		}
	}

	auto& primaryCell = GetCell(topLeft);
	primaryCell.SpanX = bottomRight.x - topLeft.x;
	primaryCell.SpanY = bottomRight.y - topLeft.y;

	return MCR_Success;
}

TableTemplate::BreakCellsResult TableTemplate::BreakCells(Vec2i topLeft)
{
	auto& primaryCell = GetCell(topLeft);
	if (!primaryCell.IsMergedCell()) {
		return BCR_CellNotMerged;
	}

	for (int dy = 0; dy < primaryCell.SpanY; ++dy) {
		for (int dx = 0; dx < primaryCell.SpanX; ++dx) {
			auto& cell = GetCell({ topLeft.x + dx, topLeft.y + dy });
			cell.PrimaryCellLocation = { -1, -1 };
		}
	}

	primaryCell.SpanX = 1;
	primaryCell.SpanY = 1;

	return BCR_Success;
}