/**
 * @license
 * Copyright 2015 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @fileoverview Generating PHP for colour blocks.
 */
'use strict';

goog.module('Blockly.PHP.colour');

const PHP = goog.require('Blockly.PHP');


PHP['colour_picker'] = function(block) {
  // Colour picker.
  const code = PHP.quote_(block.getFieldValue('COLOUR'));
  return [code, PHP.ORDER_ATOMIC];
};

PHP['colour_random'] = function(block) {
  // Generate a random colour.
  const functionName = PHP.provideFunction_('colour_random', [
    'function ' + PHP.FUNCTION_NAME_PLACEHOLDER_ + '() {',
    '  return \'#\' . str_pad(dechex(mt_rand(0, 0xFFFFFF)), ' +
        '6, \'0\', STR_PAD_LEFT);',
    '}'
  ]);
  const code = functionName + '()';
  return [code, PHP.ORDER_FUNCTION_CALL];
};

PHP['colour_rgb'] = function(block) {
  // Compose a colour from RGB components expressed as percentages.
  const red = PHP.valueToCode(block, 'RED', PHP.ORDER_NONE) || 0;
  const green = PHP.valueToCode(block, 'GREEN', PHP.ORDER_NONE) || 0;
  const blue = PHP.valueToCode(block, 'BLUE', PHP.ORDER_NONE) || 0;
  const functionName = PHP.provideFunction_('colour_rgb', [
    'function ' + PHP.FUNCTION_NAME_PLACEHOLDER_ + '($r, $g, $b) {',
    '  $r = round(max(min($r, 100), 0) * 2.55);',
    '  $g = round(max(min($g, 100), 0) * 2.55);',
    '  $b = round(max(min($b, 100), 0) * 2.55);', '  $hex = \'#\';',
    '  $hex .= str_pad(dechex($r), 2, \'0\', STR_PAD_LEFT);',
    '  $hex .= str_pad(dechex($g), 2, \'0\', STR_PAD_LEFT);',
    '  $hex .= str_pad(dechex($b), 2, \'0\', STR_PAD_LEFT);', '  return $hex;',
    '}'
  ]);
  const code = functionName + '(' + red + ', ' + green + ', ' + blue + ')';
  return [code, PHP.ORDER_FUNCTION_CALL];
};

PHP['colour_blend'] = function(block) {
  // Blend two colours together.
  const c1 = PHP.valueToCode(block, 'COLOUR1', PHP.ORDER_NONE) || '\'#000000\'';
  const c2 = PHP.valueToCode(block, 'COLOUR2', PHP.ORDER_NONE) || '\'#000000\'';
  const ratio = PHP.valueToCode(block, 'RATIO', PHP.ORDER_NONE) || 0.5;
  const functionName = PHP.provideFunction_('colour_blend', [
    'function ' + PHP.FUNCTION_NAME_PLACEHOLDER_ + '($c1, $c2, $ratio) {',
    '  $ratio = max(min($ratio, 1), 0);', '  $r1 = hexdec(substr($c1, 1, 2));',
    '  $g1 = hexdec(substr($c1, 3, 2));', '  $b1 = hexdec(substr($c1, 5, 2));',
    '  $r2 = hexdec(substr($c2, 1, 2));', '  $g2 = hexdec(substr($c2, 3, 2));',
    '  $b2 = hexdec(substr($c2, 5, 2));',
    '  $r = round($r1 * (1 - $ratio) + $r2 * $ratio);',
    '  $g = round($g1 * (1 - $ratio) + $g2 * $ratio);',
    '  $b = round($b1 * (1 - $ratio) + $b2 * $ratio);', '  $hex = \'#\';',
    '  $hex .= str_pad(dechex($r), 2, \'0\', STR_PAD_LEFT);',
    '  $hex .= str_pad(dechex($g), 2, \'0\', STR_PAD_LEFT);',
    '  $hex .= str_pad(dechex($b), 2, \'0\', STR_PAD_LEFT);', '  return $hex;',
    '}'
  ]);
  const code = functionName + '(' + c1 + ', ' + c2 + ', ' + ratio + ')';
  return [code, PHP.ORDER_FUNCTION_CALL];
};