<?php
final class SitiWashInstructions
{
    private const TAXONOMY = 'product_brand';

    public static function init(): void
    {
        add_action('init', [__CLASS__, 'register_brand_hooks']);

        add_filter('woocommerce_product_data_tabs', [__CLASS__, 'add_product_tab']);
        add_action('woocommerce_product_data_panels', [__CLASS__, 'render_product_panel']);
        add_action('woocommerce_process_product_meta', [__CLASS__, 'save_product_meta'], 20);
        add_action('admin_head', [__CLASS__, 'admin_tab_icon']);
    }

    private static function fields(): array
    {
        return [
            'temperature' => [
                'label' => __('Temperatuur', 'siti-wash-instructions'),
                'term_key' => 'lb_wash_temp',
                'product_key' => '_lb_wash_temp',
                'icon' => '🌡️',
                'options' => [
                    '' => __('Geen advies', 'siti-wash-instructions'),
                    'cold' => __('Koud wassen (max 20°C)', 'siti-wash-instructions'),
                    '30h' => __('30°C handwas', 'siti-wash-instructions'),
                    '30' => __('30°C fijnwas', 'siti-wash-instructions'),
                    '40' => __('40°C normaal', 'siti-wash-instructions'),
                    '60' => __('60°C intensief', 'siti-wash-instructions'),
                    'hand' => __('Alleen handwas', 'siti-wash-instructions'),
                ],
            ],
            'dryer' => [
                'label' => __('Droger', 'siti-wash-instructions'),
                'term_key' => 'lb_wash_dryer',
                'product_key' => '_lb_wash_dryer',
                'icon' => '🌀',
                'options' => [
                    '' => __('Geen advies', 'siti-wash-instructions'),
                    'no' => __('Niet in de droger', 'siti-wash-instructions'),
                    'low' => __('Alleen lage stand', 'siti-wash-instructions'),
                    'yes' => __('Droger toegestaan', 'siti-wash-instructions'),
                ],
            ],
            'iron' => [
                'label' => __('Strijken', 'siti-wash-instructions'),
                'term_key' => 'lb_wash_iron',
                'product_key' => '_lb_wash_iron',
                'icon' => '🧺',
                'options' => [
                    '' => __('Geen advies', 'siti-wash-instructions'),
                    'no' => __('Niet strijken', 'siti-wash-instructions'),
                    'low' => __('Lage temperatuur', 'siti-wash-instructions'),
                    'med' => __('Gemiddelde temperatuur', 'siti-wash-instructions'),
                    'high' => __('Hoge temperatuur', 'siti-wash-instructions'),
                ],
            ],
            'bleach' => [
                'label' => __('Bleken', 'siti-wash-instructions'),
                'term_key' => 'lb_wash_bleach',
                'product_key' => '_lb_wash_bleach',
                'icon' => '🫧',
                'options' => [
                    '' => __('Geen advies', 'siti-wash-instructions'),
                    'no' => __('Niet bleken', 'siti-wash-instructions'),
                    'yes' => __('Alleen zuurstofbleekmiddel', 'siti-wash-instructions'),
                ],
            ],
        ];
    }

    public static function register_brand_hooks(): void
    {
        $tax = self::TAXONOMY;
        add_action("{$tax}_add_form_fields", [__CLASS__, 'render_brand_add_form']);
        add_action("{$tax}_edit_form_fields", [__CLASS__, 'render_brand_edit_form'], 10, 2);
        add_action("created_{$tax}", [__CLASS__, 'save_brand_fields']);
        add_action("edited_{$tax}", [__CLASS__, 'save_brand_fields']);
    }

    public static function render_brand_add_form($taxonomy): void
    {
        foreach (self::fields() as $field) {
            self::render_brand_field('', $field);
        }
    }

    public static function render_brand_edit_form($term, $taxonomy): void
    {
        foreach (self::fields() as $field) {
            $value = (string) get_term_meta($term->term_id, $field['term_key'], true);
            ?>
            <tr class="form-field">
                <th scope="row"><label><?php echo esc_html($field['label']); ?></label></th>
                <td>
                    <?php self::render_brand_select($field, $value); ?>
                </td>
            </tr>
            <?php
        }
    }

    private static function render_brand_field(string $value, array $field): void
    {
        ?>
        <div class="form-field">
            <label><?php echo esc_html($field['label']); ?></label>
            <?php self::render_brand_select($field, $value); ?>
        </div>
        <?php
    }

    private static function render_brand_select(array $field, string $value): void
    {
        ?>
        <select name="<?php echo esc_attr($field['term_key']); ?>" style="width:100%;">
            <option value=""><?php esc_html_e('Geen advies', 'siti-wash-instructions'); ?></option>
            <?php foreach ($field['options'] as $key => $label): ?>
                <?php if ($key === '')
                    continue; ?>
                <option value="<?php echo esc_attr($key); ?>" <?php selected($value, $key); ?>>
                    <?php echo esc_html($label); ?>
                </option>
            <?php endforeach; ?>
        </select>
        <?php
    }

    public static function save_brand_fields(int $term_id): void
    {
        foreach (self::fields() as $field) {
            $key = $field['term_key'];
            if (!isset($_POST[$key])) {
                continue;
            }
            $value = sanitize_text_field(wp_unslash($_POST[$key]));
            update_term_meta($term_id, $key, $value);
        }
    }

    public static function add_product_tab(array $tabs): array
    {
        $tabs['lb_wash_advice'] = [
            'label' => __('Wasadvies', 'siti-wash-instructions'),
            'target' => 'lb_wash_advice_panel',
            'class' => ['lb-wash-advice-tab', 'show_if_simple', 'show_if_variable', 'show_if_grouped', 'show_if_external'],
            'priority' => 66,
        ];

        return $tabs;
    }

    public static function render_product_panel(): void
    {
        global $post;
        ?>
        <div id="lb_wash_advice_panel" class="panel woocommerce_options_panel">
            <div class="options_group">
                <?php
                foreach (self::fields() as $field_key => $field) {
                    $product_value = get_post_meta($post->ID, $field['product_key'], true);
                    $options = ['inherit' => __('Volg merk (standaard)', 'siti-wash-instructions')] + $field['options'];
                    woocommerce_wp_select([
                        'id' => $field['product_key'],
                        'label' => $field['label'],
                        'value' => $product_value !== '' ? $product_value : 'inherit',
                        'options' => $options,
                        'desc_tip' => false,
                        'description' => __('Kies hier om het merkadvies te overschrijven.', 'siti-wash-instructions'),
                    ]);
                }
                ?>
            </div>
        </div>
        <?php
    }

    public static function admin_tab_icon(): void
    {
        ?>
        <style>
            #woocommerce-product-data ul.wc-tabs li.lb-wash-advice-tab a:before {
                content: "\f19a";
                font-family: Dashicons;
            }
        </style>
        <?php
    }

    public static function save_product_meta(int $post_id): void
    {
        foreach (self::fields() as $field) {
            $key = $field['product_key'];
            if (!isset($_POST[$key])) {
                continue;
            }
            $value = sanitize_text_field(wp_unslash($_POST[$key]));
            update_post_meta($post_id, $key, $value);
        }
    }

    private static function get_product_advice(int $product_id): array
    {
        $result = [];
        foreach (self::fields() as $field_key => $field) {
            $value = get_post_meta($product_id, $field['product_key'], true);
            if ($value === '' || $value === 'inherit') {
                $value = self::get_brand_value($product_id, $field['term_key']);
            }

            if ($value && isset($field['options'][$value])) {
                $result[$field_key] = [
                    'label' => $field['label'],
                    'text' => $field['options'][$value],
                    'icon' => $field['icon'],
                ];
            }
        }

        return $result;
    }

    private static function get_brand_value(int $product_id, string $meta_key): string
    {
        $terms = get_the_terms($product_id, self::TAXONOMY);
        if (empty($terms) || is_wp_error($terms)) {
            return '';
        }

        foreach ($terms as $term) {
            $value = get_term_meta($term->term_id, $meta_key, true);
            if ($value !== '') {
                return (string) $value;
            }
        }

        return '';
    }

    public static function render_frontend_block(bool $echo = true, $product = null): string
    {
        if ($product === null) {
            global $product;
        }

        if (!$product instanceof WC_Product) {
            return '';
        }

        $output = self::build_wash_markup($product);
        if ($echo && $output !== '') {
            echo $output;
        }

        return $output;
    }

    private static function build_wash_markup(WC_Product $product): string
    {
        $data = self::get_product_advice($product->get_id());
        if (empty($data)) {
            return '';
        }
        ob_start();

        static $printed_styles = false;
        if (!$printed_styles) {
            $printed_styles = true;
            ?>
            <style>
                .lb-wash-card {
                    background: linear-gradient(135deg, #f0fbff, #fdf9ff);
                    border: 1px solid rgba(0, 140, 186, 0.2);
                    border-radius: 10px;
                    padding: 16px 18px;
                    margin: 16px 0;
                }

                .lb-wash-card__title {
                    font-size: 13px;
                    text-transform: uppercase;
                    letter-spacing: .5px;
                    color: #008cba;
                    font-weight: 600;
                    margin-bottom: 8px;
                    display: flex;
                    align-items: center;
                    gap: 6px;
                }

                .lb-wash-card__list {
                    list-style: none;
                    padding: 0;
                    margin: 0;
                }

                .lb-wash-card__list li {
                    display: flex;
                    align-items: flex-start;
                    gap: 10px;
                    padding: 6px 0;
                    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
                    font-size: 15px;
                    color: #333;
                }

                .lb-wash-card__list li:last-child {
                    border-bottom: none;
                }

                .lb-wash-card__icon {
                    font-size: 18px;
                }
            </style>
            <?php
        }

        ?>
        <div class="lb-wash-card">
            <div class="lb-wash-card__title">🧼 <?php esc_html_e('Wasadvies', 'siti-wash-instructions'); ?></div>
            <ul class="lb-wash-card__list">
                <?php foreach ($data as $item): ?>
                    <li>
                        <span class="lb-wash-card__icon" aria-hidden="true"><?php echo esc_html($item['icon']); ?></span>
                        <span>
                            <strong><?php echo esc_html($item['label']); ?>:</strong>
                            <?php echo esc_html($item['text']); ?>
                        </span>
                    </li>
                <?php endforeach; ?>
            </ul>
        </div>
        <?php
        return ob_get_clean();
    }
}