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const objectAssign = require('object-assign');
const Cell = require('./cell');
const { ColSpanCell, RowSpanCell } = Cell;
(function() {
function layoutTable(table) {
table.forEach(function(row, rowIndex) {
row.forEach(function(cell, columnIndex) {
cell.y = rowIndex;
cell.x = columnIndex;
for (let y = rowIndex; y >= 0; y--) {
let row2 = table[y];
let xMax = y === rowIndex ? columnIndex : row2.length;
for (let x = 0; x < xMax; x++) {
let cell2 = row2[x];
while (cellsConflict(cell, cell2)) {
cell.x++;
}
}
}
});
});
}
function maxWidth(table) {
let mw = 0;
table.forEach(function(row) {
row.forEach(function(cell) {
mw = Math.max(mw, cell.x + (cell.colSpan || 1));
});
});
return mw;
}
function maxHeight(table) {
return table.length;
}
function cellsConflict(cell1, cell2) {
let yMin1 = cell1.y;
let yMax1 = cell1.y - 1 + (cell1.rowSpan || 1);
let yMin2 = cell2.y;
let yMax2 = cell2.y - 1 + (cell2.rowSpan || 1);
let yConflict = !(yMin1 > yMax2 || yMin2 > yMax1);
let xMin1 = cell1.x;
let xMax1 = cell1.x - 1 + (cell1.colSpan || 1);
let xMin2 = cell2.x;
let xMax2 = cell2.x - 1 + (cell2.colSpan || 1);
let xConflict = !(xMin1 > xMax2 || xMin2 > xMax1);
return yConflict && xConflict;
}
function conflictExists(rows, x, y) {
let i_max = Math.min(rows.length - 1, y);
let cell = { x: x, y: y };
for (let i = 0; i <= i_max; i++) {
let row = rows[i];
for (let j = 0; j < row.length; j++) {
if (cellsConflict(cell, row[j])) {
return true;
}
}
}
return false;
}
function allBlank(rows, y, xMin, xMax) {
for (let x = xMin; x < xMax; x++) {
if (conflictExists(rows, x, y)) {
return false;
}
}
return true;
}
function addRowSpanCells(table) {
table.forEach(function(row, rowIndex) {
row.forEach(function(cell) {
for (let i = 1; i < cell.rowSpan; i++) {
let rowSpanCell = new RowSpanCell(cell);
rowSpanCell.x = cell.x;
rowSpanCell.y = cell.y + i;
rowSpanCell.colSpan = cell.colSpan;
insertCell(rowSpanCell, table[rowIndex + i]);
}
});
});
}
function addColSpanCells(cellRows) {
for (let rowIndex = cellRows.length - 1; rowIndex >= 0; rowIndex--) {
let cellColumns = cellRows[rowIndex];
for (let columnIndex = 0; columnIndex < cellColumns.length; columnIndex++) {
let cell = cellColumns[columnIndex];
for (let k = 1; k < cell.colSpan; k++) {
let colSpanCell = new ColSpanCell();
colSpanCell.x = cell.x + k;
colSpanCell.y = cell.y;
cellColumns.splice(columnIndex + 1, 0, colSpanCell);
}
}
}
}
function insertCell(cell, row) {
let x = 0;
while (x < row.length && row[x].x < cell.x) {
x++;
}
row.splice(x, 0, cell);
}
function fillInTable(table) {
let h_max = maxHeight(table);
let w_max = maxWidth(table);
for (let y = 0; y < h_max; y++) {
for (let x = 0; x < w_max; x++) {
if (!conflictExists(table, x, y)) {
let opts = { x: x, y: y, colSpan: 1, rowSpan: 1 };
x++;
while (x < w_max && !conflictExists(table, x, y)) {
opts.colSpan++;
x++;
}
let y2 = y + 1;
while (y2 < h_max && allBlank(table, y2, opts.x, opts.x + opts.colSpan)) {
opts.rowSpan++;
y2++;
}
let cell = new Cell(opts);
cell.x = opts.x;
cell.y = opts.y;
insertCell(cell, table[y]);
}
}
}
}
function generateCells(rows) {
return rows.map(function(row) {
if (!Array.isArray(row)) {
let key = Object.keys(row)[0];
row = row[key];
if (Array.isArray(row)) {
row = row.slice();
row.unshift(key);
} else {
row = [key, row];
}
}
return row.map(function(cell) {
return new Cell(cell);
});
});
}
function makeTableLayout(rows) {
let cellRows = generateCells(rows);
layoutTable(cellRows);
fillInTable(cellRows);
addRowSpanCells(cellRows);
addColSpanCells(cellRows);
return cellRows;
}
module.exports = {
makeTableLayout: makeTableLayout,
layoutTable: layoutTable,
addRowSpanCells: addRowSpanCells,
maxWidth: maxWidth,
fillInTable: fillInTable,
computeWidths: makeComputeWidths('colSpan', 'desiredWidth', 'x', 1),
computeHeights: makeComputeWidths('rowSpan', 'desiredHeight', 'y', 1),
};
})();
function makeComputeWidths(colSpan, desiredWidth, x, forcedMin) {
return function(vals, table) {
let result = [];
let spanners = [];
table.forEach(function(row) {
row.forEach(function(cell) {
if ((cell[colSpan] || 1) > 1) {
spanners.push(cell);
} else {
result[cell[x]] = Math.max(result[cell[x]] || 0, cell[desiredWidth] || 0, forcedMin);
}
});
});
vals.forEach(function(val, index) {
if (typeof val === 'number') {
result[index] = val;
}
});
//spanners.forEach(function(cell){
for (let k = spanners.length - 1; k >= 0; k--) {
let cell = spanners[k];
let span = cell[colSpan];
let col = cell[x];
let existingWidth = result[col];
let editableCols = typeof vals[col] === 'number' ? 0 : 1;
for (let i = 1; i < span; i++) {
existingWidth += 1 + result[col + i];
if (typeof vals[col + i] !== 'number') {
editableCols++;
}
}
if (cell[desiredWidth] > existingWidth) {
let i = 0;
while (editableCols > 0 && cell[desiredWidth] > existingWidth) {
if (typeof vals[col + i] !== 'number') {
let dif = Math.round((cell[desiredWidth] - existingWidth) / editableCols);
existingWidth += dif;
result[col + i] += dif;
editableCols--;
}
i++;
}
}
}
objectAssign(vals, result);
for (let j = 0; j < vals.length; j++) {
vals[j] = Math.max(forcedMin, vals[j] || 0);
}
};
}
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