<?php

namespace EP\EpTheme\ViewHelpers\Calendar;

/***************************************************************
 *
 *  Copyright notice
 *
 *  (c) 2018 Björn Fromme <fromme@dreipunktnull.com>, dreipunktnull
 *
 *  All rights reserved
 *
 *  This script is part of the TYPO3 project. The TYPO3 project is
 *  free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  The GNU General Public License can be found at
 *  http://www.gnu.org/copyleft/gpl.html.
 *
 *  This script is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  This copyright notice MUST APPEAR in all copies of the script!
 ***************************************************************/

use DateInterval;
use TYPO3Fluid\Fluid\Core\Rendering\RenderingContextInterface;
use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper;
use TYPO3Fluid\Fluid\Core\ViewHelper\Traits\CompileWithRenderStatic;

class ContingentViewHelper extends AbstractViewHelper
{
    use CompileWithRenderStatic;

    /**
     * @var bool
     */
    protected $escapeOutput = false;

    private const LEVEL_GREEN = 1;
    private const LEVEL_YELLOW = 2;
    private const LEVEL_RED = 3;

    public function initializeArguments()
    {
        parent::initializeArguments();

        $this->registerArgument('day', \DateTimeInterface::class, 'The day', true);
        $this->registerArgument('calendar', 'array', 'The calendar payload', true);
    }

    /**
     * @param array $arguments
     * @param \Closure $renderChildrenClosure
     * @param RenderingContextInterface $renderingContext
     * @return mixed
     */
    public static function renderStatic(
        array $arguments,
        \Closure $renderChildrenClosure,
        RenderingContextInterface $renderingContext
    )
    {
        $day = $arguments['day'];
        $calendar = $arguments['calendar'];
        $now = new \DateTimeImmutable('now');
        $dayDate = new \DateTimeImmutable($day->format('Y-m-d H:i:s'), $day->getTimezone());
        $dayDate = $dayDate->setTime(0, 0, 0);

        if (!empty($calendar['error'])) {
            $class = [ 'text-zinc-400' ];
            return static::getHtml($class, $dayDate->format('d'));
        }

        if ($now > $dayDate) {
            $class = [ 'text-zinc-400' ];
            return static::getHtml($class, $dayDate->format('d'));
        }
        $statusMap = static::getStatusMap($calendar);
        $status = static::normalizeStatus($statusMap[$dayDate->format('Y-m-d')] ?? 'OK');
        $previousStatus = static::normalizeStatus($statusMap[$dayDate->sub(new DateInterval('P1D'))->format('Y-m-d')] ?? 'OK');
        $level = static::getOccupancyLevel($status);
        $previousLevel = static::getOccupancyLevel($previousStatus);

        if ($previousLevel !== $level) {
            $class = static::getTransientLabelClasses($previousStatus, $status);
        } else {
            $class = static::getLabelClasses($status);
        }

        return static::getHtml($class, $dayDate->format('d'));
    }

    /**
     * @return array
     */
    protected static function getLabelClasses(string $status): array
    {
        return [
            'block p-1 leading-none text-sm text-white',
            static::getStatusClass($status),
        ];
    }

    /**
     * @return array
     */
    protected static function getTransientLabelClasses(string $statusFrom, ?string $statusTo = null): array
    {
        $classes = [ 'block p-1 leading-none text-sm text-white' ];
        $class = static::getStatusClass($statusFrom);
        if ($statusTo !== null) {
            $class .= '-to-' . static::getStatusSuffix($statusTo);
        }
        $classes[] = $class;
        return $classes;
    }

    /**
     * @return int
     */
    protected static function getOccupancyLevel(string $status): int
    {
        if ($status === 'BLOCKED') {
            return static::LEVEL_RED;
        }
        if ($status === 'ON_REQUEST') {
            return static::LEVEL_YELLOW;
        }
        return static::LEVEL_GREEN;
    }

    /**
     * @return array<string, string>
     */
    protected static function getStatusMap(array $calendar): array
    {
        $statusMap = [];
        foreach (($calendar['data'] ?? []) as $row) {
            if (!isset($row['date'])) {
                continue;
            }
            $statusMap[$row['date']] = static::normalizeStatus((string)($row['status'] ?? 'OK'));
        }

        return $statusMap;
    }

    protected static function normalizeStatus(string $status): string
    {
        $status = strtoupper(trim($status));
        if ($status === 'ONREQUEST') {
            return 'ON_REQUEST';
        }

        if (in_array($status, [ 'OK', 'ON_REQUEST', 'BLOCKED' ], true)) {
            return $status;
        }

        return 'OK';
    }

    protected static function getStatusClass(string $status): string
    {
        if ($status === 'BLOCKED') {
            return 'availability-none';
        }
        if ($status === 'ON_REQUEST') {
            return 'availability-partial';
        }

        return 'availability-full';
    }

    protected static function getStatusSuffix(string $status): string
    {
        if ($status === 'BLOCKED') {
            return 'none';
        }
        if ($status === 'ON_REQUEST') {
            return 'partial';
        }

        return 'full';
    }

    /**
     * @param array $class
     * @param string $label
     * @return string
     */
    protected static function getHtml(array $class, $label)
    {
        $cssClass = ' class="' . implode(' ', $class) . '"';
        return sprintf('<span%s>%s</span>', $cssClass, $label);
    }
}