<?php

namespace AcademicCrew\Shortcodes;

use AcademicCrew\Core\ArchiveText;
use AcademicCrew\Core\Loader;
use AcademicCrew\Courses\AcademicYearCalculator;
use AcademicCrew\Courses\PeriodCadence;

/**
 * [academiccrew_courses_archive]
 * Attributes:
 *   per_page="12"        Courses per page
 *   default_year="auto"  Academic year pre-selected on load: "auto" (current
 *                        academic year), "all" (no year filter) or an integer
 *   show_tabs="yes"      Show All / Period 1 / Period 2 tabs
 */
class CoursesArchiveShortcode {

    public function register( Loader $loader ): void {
        add_shortcode( 'academiccrew_courses_archive', [ $this, 'render' ] );
        add_action( 'wp_enqueue_scripts', [ $this, 'maybe_enqueue' ] );
    }

    public function maybe_enqueue(): void {
        $archive_id = (int) get_option( 'academiccrew_courses_archive_page_id', 0 );
        if ( ! $archive_id || get_queried_object_id() !== $archive_id ) {
            return;
        }
        wp_enqueue_style(
            'academiccrew-courses-archive',
            ACADEMICCREW_URL . 'assets/css/courses-archive.css',
            [ 'fusion-stylesheet', 'tabler-icons' ],
            ACADEMICCREW_VERSION
        );
        wp_enqueue_script(
            'academiccrew-courses-archive',
            ACADEMICCREW_URL . 'assets/js/courses-archive.js',
            [],
            ACADEMICCREW_VERSION,
            true
        );
    }

    public function render( array $atts ): string {
        $atts = shortcode_atts( [
            'per_page'     => 12,
            'default_year' => 'auto',
            'show_tabs'    => 'yes',
        ], $atts, 'academiccrew_courses_archive' );

        $calc         = new AcademicYearCalculator();
        $default_year = match ( (string) $atts['default_year'] ) {
            'auto'  => $calc->calculate( 1 ),
            'all'   => null,
            default => (int) $atts['default_year'] ?: null,
        };

        $periods = [];
        for ( $p = 1; $p <= PeriodCadence::period_count(); $p++ ) {
            $periods[] = [
                'value'   => $p,
                'label'   => PeriodCadence::period_label( $p ),
                'yearFmt' => $calc->format( $calc->calculate( $p ) ),
            ];
        }

        wp_enqueue_style(
            'academiccrew-courses-archive',
            ACADEMICCREW_URL . 'assets/css/courses-archive.css',
            [ 'fusion-stylesheet', 'tabler-icons' ],
            ACADEMICCREW_VERSION
        );
        wp_enqueue_script(
            'academiccrew-courses-archive',
            ACADEMICCREW_URL . 'assets/js/courses-archive.js',
            [],
            ACADEMICCREW_VERSION,
            true
        );

        wp_localize_script( 'academiccrew-courses-archive', 'ACADEMICCREW_ARCHIVE', [
            'restUrl'     => rest_url( 'academiccrew/v1/courses' ),
            'filtersUrl'  => rest_url( 'academiccrew/v1/courses/filters' ),
            'nonce'       => wp_create_nonce( 'wp_rest' ),
            'perPage'     => (int) $atts['per_page'],
            'defaultYear' => $default_year,
            'periods'     => $periods,
            'i18n'        => [
                'all'               => __( 'All courses', 'academiccrew' ),
                'noResults'         => __( 'No courses found with these filters.', 'academiccrew' ),
                'loading'           => __( 'Loading courses...', 'academiccrew' ),
                'courses'           => __( 'courses', 'academiccrew' ),
                'course'            => __( 'course', 'academiccrew' ),
                'resetFilters'      => __( 'Reset filters', 'academiccrew' ),
                'sort'              => __( 'Sort', 'academiccrew' ),
                'sortCode'          => __( 'Code A→Z', 'academiccrew' ),
                'sortName'          => __( 'Name A→Z', 'academiccrew' ),
                'sortCfuDesc'       => __( 'Credits ↓', 'academiccrew' ),
                'sortCfuAsc'        => __( 'Credits ↑', 'academiccrew' ),
                'sortYearDesc'      => __( 'Year ↓', 'academiccrew' ),
                'sortYearAsc'       => __( 'Year ↑', 'academiccrew' ),
                'cfu'               => 'CFU',
                'viewCourse'        => __( 'View course →', 'academiccrew' ),
                'allYears'          => __( 'All academic years', 'academiccrew' ),
                'allDegrees'        => __( 'All degree programmes', 'academiccrew' ),
                'allInstructors'    => __( 'All instructors', 'academiccrew' ),
                'language'          => __( 'Language', 'academiccrew' ),
                'credits'           => __( 'Credits', 'academiccrew' ),
                'degreeProgram'     => __( 'Degree programme', 'academiccrew' ),
                'instructor'        => __( 'Instructor', 'academiccrew' ),
                'searchPlaceholder' => __( 'Search course or code...', 'academiccrew' ),
            ],
        ] );

        ob_start();
        ?>
        <header class="acc-ph">
          <div class="acc-ph-eyebrow">
            <span class="acc-ph-bar" aria-hidden="true"></span>
            <?php echo esc_html( ArchiveText::eyebrow( 'courses', __( 'Education', 'academiccrew' ) ) ); ?>
          </div>
          <h1 class="acc-ph-title"><?php echo esc_html( ArchiveText::title( 'courses', __( 'Courses', 'academiccrew' ) ) ); ?></h1>
          <p class="acc-ph-lede">
            <?php echo esc_html( ArchiveText::lede( 'courses', __( 'Courses taught by members of the group — undergraduate, graduate, and doctoral level.', 'academiccrew' ) ) ); ?>
          </p>
        </header>

        <div id="academiccrew-courses-archive"
             data-per-page="<?php echo esc_attr( $atts['per_page'] ); ?>"
             data-show-tabs="<?php echo esc_attr( $atts['show_tabs'] ); ?>"
             aria-label="<?php esc_attr_e( 'Courses archive', 'academiccrew' ); ?>"
             role="region">

            <div class="acc-archive-skeleton" aria-hidden="true">
                <div class="acc-skeleton-hero"></div>
                <div class="acc-skeleton-layout">
                    <div class="acc-skeleton-sidebar">
                        <?php for ( $i = 0; $i < 5; $i++ ) : ?>
                            <div class="acc-skeleton-block"></div>
                        <?php endfor; ?>
                    </div>
                    <div class="acc-skeleton-grid">
                        <?php for ( $i = 0; $i < (int) $atts['per_page']; $i++ ) : ?>
                            <div class="acc-skeleton-card"></div>
                        <?php endfor; ?>
                    </div>
                </div>
            </div>

            <noscript>
                <p><?php esc_html_e( 'JavaScript is required to view the course list.', 'academiccrew' ); ?></p>
                <?php
                $fallback = get_posts( [
                    'post_type'      => 'academiccrew_course',
                    'post_status'    => 'publish',
                    'posts_per_page' => 50,
                    'meta_key'       => '_acc_academic_year',
                    'orderby'        => [ 'meta_value_num' => 'DESC', 'title' => 'ASC' ],
                ] );
                if ( $fallback ) :
                    echo '<ul>';
                    foreach ( $fallback as $c ) :
                        $page_id = (int) get_post_meta( $c->ID, '_academiccrew_linked_page_id', true );
                        $url     = $page_id ? get_permalink( $page_id ) : get_permalink( $c->ID );
                        $code    = get_post_meta( $c->ID, '_acc_course_code', true );
                        echo '<li><a href="' . esc_url( $url ) . '">';
                        echo esc_html( $code ? "[{$code}] " : '' ) . esc_html( $c->post_title );
                        echo '</a></li>';
                    endforeach;
                    echo '</ul>';
                endif;
                ?>
            </noscript>
        </div>
        <?php
        return ob_get_clean();
    }
}