<?php

namespace App\Controller;

/**
 * Color class example page.
 */
class Color extends Index
{
    const STEP_SIZE = 0.02;

    protected function _run()
    {
        $gamma = \Request::value('gamma', \Core\Format\Color::GAMMA);
        $data = [
            'gamma' => $gamma,
            'gradient1' => $this->drawColorFade(['ff0000', '0000ff', '00ff00', 'ff0000'], $gamma),
            'gradient2' => $this->drawColorFade(['ffff00', '00ffff', 'ff00ff', 'ffff00'], $gamma),
            'gradient3' => $this->drawColorFade(['ffffff', '000000', '99ccff', 'ff99cc'], $gamma),
            'brightness1' => $this->drawBrightness('00FF00', $gamma),
            'brightness2' => $this->drawBrightness('99ccff', $gamma),
            'brightness3' => $this->drawBrightness('000000', $gamma),
        ];
        return $this->_output('Color fades', $this->_show('page/color', $data));
    }

    /**
     * Draw color-fade, fading normally through all steps.
     * @param array $blocks
     * @param float $gamma
     */
    private function drawColorFade($blocks, $gamma)
    {
        $previousBlock = array_shift($blocks);
        $colors = [];
        foreach ($blocks as $block) {
            $from = new \Core\Format\Color($previousBlock, $gamma);
            $to = new \Core\Format\Color($block, $gamma);
            for ($i = 0; $i <= 1; $i += self::STEP_SIZE) {
                $colors[] = $from->fadeTo($to, $i);
            }
            $previousBlock = $block;
        }
        return $this->_drawColors($colors);
    }

    /**
     * Draw color-fade, fading normally through all steps.
     * @param array $blocks
     * @param float $gamma
     */
    private function drawBrightness($color, $gamma)
    {
        $colors = [];
        $color = new \Core\Format\Color($color, $gamma);
        $stepsize = self::STEP_SIZE / 2;
        for ($i = 0; $i <= 1; $i += $stepsize) {
            $colors[] = $color->setBrightness($i);
        }
        return $this->_drawColors($colors);
    }

    /**
     * Draw colors for testing.
     * @param type $colors
     * @return type
     */
    private function _drawColors($colors)
    {
        $result = [];
        foreach ($colors as $color) {
            $result[] = "<div style=\"background: {$color}; overflow: hidden; height: 4px; \">&nbsp;</div>";
        }
        return implode(PHP_EOL, $result);
    }
}