<?php
namespace Zadex\Admin;

defined('ABSPATH') || exit;

use Zadex\SiteAssets\Fonts;

/**
 * "Zadex → Custom Fonts" (T166): the font list with a live sample, the add / edit screen (family, font-display,
 * variations with woff2 / woff / ttf uploads into the media library) and the Adobe Fonts project.
 */
final class CustomFontsPage
{
    public const SLUG = 'zadex-custom-fonts';
    public const ACTION_SAVE = 'zadex_font_save';
    public const ACTION_DELETE = 'zadex_font_delete';
    public const ACTION_ADOBE = 'zadex_adobe_fonts_save';

    private Fonts $fonts;
    private string $hook = '';

    public function __construct(Fonts $fonts)
    {
        $this->fonts = $fonts;
    }

    public function register(): void
    {
        add_action('admin_menu', [$this, 'menu'], 20);
        add_action('admin_enqueue_scripts', [$this, 'assets']);
        add_action('admin_post_' . self::ACTION_SAVE, [$this, 'save']);
        add_action('admin_post_' . self::ACTION_DELETE, [$this, 'delete']);
        add_action('admin_post_' . self::ACTION_ADOBE, [$this, 'save_adobe']);
    }

    public static function url(array $args = []): string
    {
        return add_query_arg(['page' => self::SLUG] + $args, admin_url('admin.php'));
    }

    public function menu(): void
    {
        $this->hook = (string) add_submenu_page('zadex', __('Custom Fonts', 'zadex'), __('Custom Fonts', 'zadex'), Fonts::CAPABILITY, self::SLUG, [$this, 'render']);
    }

    public function assets(string $hook): void
    {
        if ($hook !== $this->hook) {
            return;
        }
        wp_enqueue_script('zadex-site-assets-admin', ZADEX_URL . 'includes/Admin/assets/site-assets.js', [], ZADEX_VERSION, true);
        $css = $this->fonts->css();
        if ($css !== '') {
            wp_register_style('zadex-custom-fonts-admin', false, [], ZADEX_VERSION);
            wp_enqueue_style('zadex-custom-fonts-admin');
            wp_add_inline_style('zadex-custom-fonts-admin', wp_strip_all_tags($css));
        }
        $this->fonts->enqueue_adobe();
    }

    /**
     * Builds the variations from the form: kept files (hidden id/url, unless "remove" is ticked) and new uploads
     * (`$files` = `$_FILES['font_files']`, keyed [name|tmp_name|error|size][row][ext]). Rows marked for deletion
     * or left without any file are dropped. `$upload` stores one file and returns {id, url} or WP_Error.
     *
     * @return array{variations: array, errors: string[]}
     */
    public static function variations_from_form(array $rows, array $files, callable $upload): array
    {
        $out = [];
        $errors = [];
        foreach ($rows as $i => $row) {
            if (!is_array($row) || !empty($row['delete'])) {
                continue;
            }
            $kept = [];
            foreach (array_keys(Fonts::FORMATS) as $ext) {
                $f = $row['files'][$ext] ?? null;
                if (is_array($f) && !empty($f['url']) && empty($row['remove'][$ext])) {
                    $kept[$ext] = ['id' => (int) ($f['id'] ?? 0), 'url' => (string) $f['url']];
                }
                $name = $files['name'][$i][$ext] ?? '';
                if (is_string($name) && $name !== '' && (int) ($files['error'][$i][$ext] ?? 4) !== 4) {
                    $stored = $upload([
                        'name'     => $name,
                        'type'     => (string) ($files['type'][$i][$ext] ?? ''),
                        'tmp_name' => (string) ($files['tmp_name'][$i][$ext] ?? ''),
                        'error'    => (int) ($files['error'][$i][$ext] ?? 1),
                        'size'     => (int) ($files['size'][$i][$ext] ?? 0),
                    ]);
                    if (is_wp_error($stored)) {
                        $errors[] = $name . ': ' . $stored->get_error_message();
                    } elseif (strtolower(pathinfo($name, PATHINFO_EXTENSION)) === $ext) {
                        $kept[$ext] = $stored;
                    } else {
                        $errors[] = $name . ': ' . __('Font files must be .woff2, .woff or .ttf.', 'zadex');
                    }
                }
            }
            if ($kept) {
                $out[] = ['weight' => (string) ($row['weight'] ?? '400'), 'style' => (string) ($row['style'] ?? 'normal'), 'files' => $kept];
            }
        }
        return ['variations' => Fonts::sanitize_variations($out), 'errors' => $errors];
    }

    /**
     * Saves a font from the already-sanitized form fields (`family`, `display`, `id`, `variations` rows) and the
     * sanitized `font_files` upload entry.
     *
     * @return array{id: int|\WP_Error, errors: string[]}
     */
    public function handle_save(array $post, array $files)
    {
        $built = self::variations_from_form(is_array($post['variations'] ?? null) ? $post['variations'] : [], $files, [Fonts::class, 'upload']);
        $id = $this->fonts->save([
            'family'     => (string) ($post['family'] ?? ''),
            'display'    => (string) ($post['display'] ?? 'swap'),
            'variations' => $built['variations'],
        ], (int) ($post['id'] ?? 0));
        return ['id' => $id, 'errors' => $built['errors']];
    }

    /** admin-post.php: add / update a font. */
    public function save(): void
    {
        if (!current_user_can(Fonts::CAPABILITY)) {
            wp_die(esc_html__('You are not allowed to manage fonts.', 'zadex'), 403);
        }
        check_admin_referer(self::ACTION_SAVE);
        $form = [
            'id'         => isset($_POST['id']) ? absint(wp_unslash($_POST['id'])) : 0,
            'family'     => isset($_POST['family']) ? sanitize_text_field(wp_unslash($_POST['family'])) : '',
            'display'    => isset($_POST['display']) ? sanitize_key(wp_unslash($_POST['display'])) : 'swap',
            'variations' => isset($_POST['variations']) && is_array($_POST['variations']) ? map_deep(wp_unslash($_POST['variations']), 'sanitize_text_field') : [],
        ];
        $files = UploadedFile::from_request('font_files', self::ACTION_SAVE) ?? [];
        $result = $this->handle_save($form, $files);
        $args = ['action' => 'edit'];
        if (is_wp_error($result['id'])) {
            $args['id'] = $form['id'];
            $result['errors'][] = $result['id']->get_error_message();
        } else {
            $args['id'] = (int) $result['id'];
            Notices::add(self::SLUG, __('Font saved.', 'zadex'), 'success', 'font-saved');
        }
        if ($result['errors']) {
            Notices::add(self::SLUG, implode(' | ', $result['errors']), 'error');
        }
        wp_safe_redirect(self::url($args));
        exit;
    }

    /** admin-post.php: delete a font (its files stay in the media library). */
    public function delete(): void
    {
        if (!current_user_can(Fonts::CAPABILITY)) {
            wp_die(esc_html__('You are not allowed to manage fonts.', 'zadex'), 403);
        }
        check_admin_referer(self::ACTION_DELETE);
        $this->fonts->delete(isset($_GET['id']) ? absint(wp_unslash($_GET['id'])) : 0);
        Notices::add(self::SLUG, __('Font deleted.', 'zadex'));
        wp_safe_redirect(self::url());
        exit;
    }

    /** admin-post.php: Adobe Fonts project id and families. */
    public function save_adobe(): void
    {
        if (!current_user_can(Fonts::CAPABILITY)) {
            wp_die(esc_html__('You are not allowed to manage fonts.', 'zadex'), 403);
        }
        check_admin_referer(self::ACTION_ADOBE);
        $project = isset($_POST['adobe_project']) ? sanitize_text_field(wp_unslash($_POST['adobe_project'])) : '';
        $families = isset($_POST['adobe_families']) ? sanitize_textarea_field(wp_unslash($_POST['adobe_families'])) : '';
        $refresh = !empty($_POST['adobe_refresh']);
        $result = $this->fonts->save_adobe($project, $families, $refresh);
        if (is_wp_error($result)) {
            Notices::add(self::SLUG, $result->get_error_message(), 'error');
        } else {
            Notices::add(self::SLUG, __('Adobe Fonts settings saved.', 'zadex'));
        }
        wp_safe_redirect(self::url());
        exit;
    }

    public function render(): void
    {
        if (!current_user_can(Fonts::CAPABILITY)) {
            return;
        }
        // Screen routing only (list vs. add/edit form): nothing is changed here, the capability is checked above
        // and saving goes through the nonce-checked admin-post handlers.
        // phpcs:disable WordPress.Security.NonceVerification.Recommended
        $screen_action = isset($_GET['action']) ? sanitize_key(wp_unslash($_GET['action'])) : '';
        $edit_id = isset($_GET['id']) ? absint(wp_unslash($_GET['id'])) : 0;
        // phpcs:enable WordPress.Security.NonceVerification.Recommended
        if ($screen_action === 'edit') {
            $this->render_edit($edit_id);
            return;
        }
        $fonts = $this->fonts->all();
        $adobe = $this->fonts->adobe();
        ?>
<div class="wrap zadex-custom-fonts">
  <h1 class="wp-heading-inline"><?php esc_html_e('Custom Fonts', 'zadex'); ?></h1>
  <a class="page-title-action" href="<?php echo esc_url(self::url(['action' => 'edit'])); ?>" data-testid="font-add"><?php esc_html_e('Add font', 'zadex'); ?></a>
  <hr class="wp-header-end">
  <?php Notices::render(self::SLUG); ?>
  <p class="description"><?php esc_html_e('Uploaded fonts appear in every font family picker of the Zadex editor, under "Custom fonts".', 'zadex'); ?></p>
  <table class="widefat striped" style="margin-top:12px">
    <thead><tr><th><?php esc_html_e('Family', 'zadex'); ?></th><th><?php esc_html_e('Preview', 'zadex'); ?></th><th><?php esc_html_e('Variations', 'zadex'); ?></th><th></th></tr></thead>
    <tbody>
    <?php if (!$fonts) : ?><tr><td colspan="4"><?php esc_html_e('No custom fonts yet.', 'zadex'); ?></td></tr><?php endif; ?>
    <?php foreach ($fonts as $f) : ?>
      <tr data-testid="font-row">
        <td><strong><a href="<?php echo esc_url(self::url(['action' => 'edit', 'id' => $f['id']])); ?>"><?php echo esc_html($f['family']); ?></a></strong></td>
        <td><span style="font-family:'<?php echo esc_attr($f['family']); ?>';font-size:20px"><?php esc_html_e('The quick brown fox jumps', 'zadex'); ?></span></td>
        <td><?php echo esc_html(implode(', ', array_map(static fn(array $v): string => $v['weight'] . ($v['style'] === 'italic' ? ' italic' : ''), $f['variations']))); ?></td>
        <td><a href="<?php echo esc_url(self::url(['action' => 'edit', 'id' => $f['id']])); ?>"><?php esc_html_e('Edit', 'zadex'); ?></a> |
          <a class="submitdelete" href="<?php echo esc_url(wp_nonce_url(add_query_arg(['action' => self::ACTION_DELETE, 'id' => $f['id']], admin_url('admin-post.php')), self::ACTION_DELETE)); ?>" data-zadex-confirm="<?php esc_attr_e('Delete this font? The files stay in the media library.', 'zadex'); ?>"><?php esc_html_e('Delete', 'zadex'); ?></a></td>
      </tr>
    <?php endforeach; ?>
    </tbody>
  </table>

  <h2 style="margin-top:32px"><?php esc_html_e('Adobe Fonts', 'zadex'); ?></h2>
  <p class="description"><?php esc_html_e('Enter the id of a web project from fonts.adobe.com. Its stylesheet is loaded on the site and its families are added to the editor pickers.', 'zadex'); ?></p>
  <form method="post" action="<?php echo esc_url(admin_url('admin-post.php')); ?>">
    <input type="hidden" name="action" value="<?php echo esc_attr(self::ACTION_ADOBE); ?>">
    <?php wp_nonce_field(self::ACTION_ADOBE); ?>
    <table class="form-table" role="presentation">
      <tr><th scope="row"><label for="zx-adobe-project"><?php esc_html_e('Project id', 'zadex'); ?></label></th>
        <td><input class="regular-text" id="zx-adobe-project" name="adobe_project" type="text" value="<?php echo esc_attr($adobe['project']); ?>" placeholder="abc1def" autocomplete="off">
          <?php if ($adobe['project'] !== '') : ?><label style="margin-inline-start:8px"><input type="checkbox" name="adobe_refresh" value="1"> <?php esc_html_e('Refresh the family list', 'zadex'); ?></label><?php endif; ?></td></tr>
      <tr><th scope="row"><label for="zx-adobe-families"><?php esc_html_e('Families', 'zadex'); ?></label></th>
        <td><textarea id="zx-adobe-families" name="adobe_families" rows="4" class="regular-text" placeholder="proxima-nova"><?php echo esc_textarea($adobe['manual'] ? implode("\n", array_column($adobe['families'], 'family')) : ''); ?></textarea>
          <p class="description"><?php esc_html_e('Optional: one CSS family name per line. Leave empty to read them from Adobe Fonts.', 'zadex'); ?></p>
          <?php if ($adobe['families']) : ?><p><?php esc_html_e('Families in the pickers:', 'zadex'); ?> <code><?php echo esc_html(implode(', ', array_column($adobe['families'], 'family'))); ?></code></p><?php endif; ?></td></tr>
    </table>
    <?php submit_button(__('Save Adobe Fonts', 'zadex'), 'secondary'); ?>
  </form>
</div>
        <?php
    }

    private function render_edit(int $id): void
    {
        $font = $id > 0 ? $this->fonts->get($id) : null;
        if (!$font) {
            $id = 0;
            $font = ['family' => '', 'display' => 'swap', 'variations' => []];
        }
        $rows = $font['variations'] ?: [['weight' => '400', 'style' => 'normal', 'files' => []]];
        ?>
<div class="wrap zadex-custom-font-edit">
  <h1><?php echo $id ? esc_html__('Edit font', 'zadex') : esc_html__('Add font', 'zadex'); ?></h1>
  <p><a href="<?php echo esc_url(self::url()); ?>">&larr; <?php esc_html_e('All fonts', 'zadex'); ?></a></p>
  <?php Notices::render(self::SLUG); ?>
  <form method="post" action="<?php echo esc_url(admin_url('admin-post.php')); ?>" enctype="multipart/form-data">
    <input type="hidden" name="action" value="<?php echo esc_attr(self::ACTION_SAVE); ?>">
    <input type="hidden" name="id" value="<?php echo (int) $id; ?>">
    <?php wp_nonce_field(self::ACTION_SAVE); ?>
    <table class="form-table" role="presentation">
      <tr><th scope="row"><label for="zx-font-family"><?php esc_html_e('Family name', 'zadex'); ?></label></th>
        <td><input class="regular-text" id="zx-font-family" name="family" type="text" value="<?php echo esc_attr($font['family']); ?>" required></td></tr>
      <tr><th scope="row"><label for="zx-font-display"><?php esc_html_e('Font display', 'zadex'); ?></label></th>
        <td><select id="zx-font-display" name="display">
          <?php foreach (Fonts::DISPLAYS as $d) : ?><option value="<?php echo esc_attr($d); ?>" <?php selected($font['display'], $d); ?>><?php echo esc_html($d); ?></option><?php endforeach; ?>
        </select>
          <p class="description"><?php esc_html_e('"swap" shows the fallback font until the file has loaded (recommended).', 'zadex'); ?></p></td></tr>
    </table>
    <h2><?php esc_html_e('Variations', 'zadex'); ?></h2>
    <p class="description"><?php esc_html_e('One row per weight and style. Upload at least one file: .woff2 (best), .woff or .ttf.', 'zadex'); ?></p>
    <table class="widefat striped zadex-font-variations" data-zx-repeater>
      <thead><tr><th><?php esc_html_e('Weight', 'zadex'); ?></th><th><?php esc_html_e('Style', 'zadex'); ?></th><th>WOFF2</th><th>WOFF</th><th>TTF</th><th><?php esc_html_e('Delete', 'zadex'); ?></th></tr></thead>
      <tbody data-zx-rows>
      <?php foreach ($rows as $i => $row) {
          $this->render_row((string) $i, $row);
      } ?>
      </tbody>
    </table>
    <template data-zx-row-template><?php $this->render_row('__i__', ['weight' => '400', 'style' => 'normal', 'files' => []]); ?></template>
    <p><button type="button" class="button" data-zx-add-row><?php esc_html_e('Add variation', 'zadex'); ?></button></p>
    <?php submit_button($id ? __('Update font', 'zadex') : __('Save font', 'zadex')); ?>
  </form>
</div>
        <?php
    }

    private function render_row(string $i, array $row): void
    {
        $base = 'variations[' . $i . ']';
        ?>
<tr data-testid="font-variation">
  <td><select name="<?php echo esc_attr($base . '[weight]'); ?>">
    <?php foreach (Fonts::WEIGHTS as $w) : ?><option value="<?php echo esc_attr($w); ?>" <?php selected((string) ($row['weight'] ?? '400'), $w); ?>><?php echo esc_html($w); ?></option><?php endforeach; ?>
  </select></td>
  <td><select name="<?php echo esc_attr($base . '[style]'); ?>">
    <option value="normal" <?php selected($row['style'] ?? 'normal', 'normal'); ?>><?php esc_html_e('Normal', 'zadex'); ?></option>
    <option value="italic" <?php selected($row['style'] ?? 'normal', 'italic'); ?>><?php esc_html_e('Italic', 'zadex'); ?></option>
  </select></td>
  <?php foreach (array_keys(Fonts::FORMATS) as $ext) :
      $file = $row['files'][$ext] ?? null; ?>
  <td>
    <?php if (is_array($file) && !empty($file['url'])) : ?>
      <input type="hidden" name="<?php echo esc_attr($base . '[files][' . $ext . '][id]'); ?>" value="<?php echo (int) ($file['id'] ?? 0); ?>">
      <input type="hidden" name="<?php echo esc_attr($base . '[files][' . $ext . '][url]'); ?>" value="<?php echo esc_attr($file['url']); ?>">
      <a href="<?php echo esc_url($file['url']); ?>" target="_blank" rel="noopener"><?php echo esc_html(basename((string) wp_parse_url($file['url'], PHP_URL_PATH))); ?></a>
      <label style="display:block"><input type="checkbox" name="<?php echo esc_attr($base . '[remove][' . $ext . ']'); ?>" value="1"> <?php esc_html_e('Remove', 'zadex'); ?></label>
    <?php endif; ?>
    <input type="file" name="<?php echo esc_attr('font_files[' . $i . '][' . $ext . ']'); ?>" accept=".<?php echo esc_attr($ext); ?>" data-testid="font-file-<?php echo esc_attr($ext); ?>">
  </td>
  <?php endforeach; ?>
  <td><input type="checkbox" name="<?php echo esc_attr($base . '[delete]'); ?>" value="1" aria-label="<?php esc_attr_e('Delete', 'zadex'); ?>"></td>
</tr>
        <?php
    }
}