<?php
/**
 * Handlers AJAX du scroll infini (grille + agenda) et données des cartes agenda.
 *
 * Les deux handlers partagent la lecture des filtres POST et la construction
 * de la requête (thalim_ajax_read_filters / thalim_ajax_build_query_args) —
 * seuls divergent l'include_children de la clause catégorie, l'exclusion des
 * épinglés (grille) et le calcul du today_offset (agenda).
 */

/**
 * Lit et assainit les filtres communs envoyés en POST par infiniteScroll.js
 * et agendaView.js.
 */
function thalim_ajax_read_filters(): array {
    return [
        'page'          => intval( $_POST['page'] ?? 1 ),
        'category'      => isset( $_POST['category'] )      ? intval( $_POST['category'] )                      : 0,
        'axe'           => isset( $_POST['axe'] )           ? intval( $_POST['axe'] )                           : 0,
        'date_from'     => isset( $_POST['date_from'] )     ? sanitize_text_field( $_POST['date_from'] )        : '',
        'date_to'       => isset( $_POST['date_to'] )       ? sanitize_text_field( $_POST['date_to'] )          : '',
        'taxonomy'      => isset( $_POST['taxonomy'] )      ? sanitize_key( $_POST['taxonomy'] )                : '',
        'term'          => isset( $_POST['term'] )          ? intval( $_POST['term'] )                          : 0,
        'filter_cat'    => isset( $_POST['filter_cat'] )    ? intval( $_POST['filter_cat'] )                    : 0,
        'filter_autres' => isset( $_POST['filter_autres'] ) ? intval( $_POST['filter_autres'] )                 : 0,
        'exclude_cats'  => isset( $_POST['exclude_cats'] )  ? sanitize_text_field( $_POST['exclude_cats'] )     : '',
        'search'        => isset( $_POST['search'] )        ? sanitize_text_field( $_POST['search'] )           : '',
    ];
}

/**
 * Construit les arguments WP_Query communs aux deux handlers.
 *
 * @param array $f                 Filtres lus par thalim_ajax_read_filters().
 * @param bool  $include_children  include_children de la clause catégorie principale.
 */
function thalim_ajax_build_query_args( array $f, bool $include_children ): array {
    $query_args = [
        'post_type'               => 'post',
        'post_status'             => 'publish', // admin-ajax => is_admin() true: sans ça WP ajoute future/draft/pending et décale la pagination vs le front
        'posts_per_page'          => 12,
        'paged'                   => $f['page'],
        'orderby'                 => 'date',
        'order'                   => 'DESC',
        'thalim_event_date_order' => true,
    ];
    if ( $f['search'] ) {
        $query_args['s']          = $f['search'];
        $query_args['relevanssi'] = true;
        $query_args['orderby']    = 'relevance';
    }

    // Build tax_query — may combine category page filter, taxonomy term, and cat filter
    $tax_clauses = [];
    if ( $f['category'] ) {
        $tax_clauses[] = [
            'taxonomy'         => 'category',
            'field'            => 'term_id',
            'terms'            => [ $f['category'] ],
            'include_children' => $include_children,
        ];
    }
    if ( $f['taxonomy'] && $f['term'] ) {
        $tax_clauses[] = [
            'taxonomy' => $f['taxonomy'],
            'field'    => 'term_id',
            'terms'    => [ $f['term'] ],
        ];
        // Exclure les séances de séminaire sur les pages de taxonomie
        $tax_clauses[] = [
            'taxonomy' => 'category',
            'field'    => 'term_id',
            'terms'    => [ thalim_cat_id( 'seance' ) ],
            'operator' => 'NOT IN',
        ];
    }
    if ( $f['filter_cat'] ) {
        $tax_clauses[] = [
            'taxonomy'         => 'category',
            'field'            => 'term_id',
            'terms'            => [ $f['filter_cat'] ],
            'include_children' => ! $f['filter_autres'],
        ];
    }
    if ( $f['exclude_cats'] ) {
        $ids = array_filter( array_map( 'intval', explode( ',', $f['exclude_cats'] ) ) );
        if ( ! empty( $ids ) ) {
            $tax_clauses[] = [
                'taxonomy' => 'category',
                'field'    => 'term_id',
                'terms'    => $ids,
                'operator' => 'NOT IN',
            ];
        }
    }
    if ( ! empty( $tax_clauses ) ) {
        $query_args['tax_query'] = count( $tax_clauses ) > 1
            ? array_merge( [ 'relation' => 'AND' ], $tax_clauses )
            : $tax_clauses;
    }

    if ( $f['axe'] ) {
        $query_args['meta_query'] = [[
            'key'   => 'axes_thematiques',
            'value' => $f['axe'],
            'type'  => 'NUMERIC',
        ]];
    }

    if ( $f['date_from'] || $f['date_to'] ) {
        $query_args['thalim_event_date_filter'] = [ 'from' => $f['date_from'], 'to' => $f['date_to'] ];
    }

    return $query_args;
}

// AJAX handler for infinite scroll on category pages
function thalim_load_more_posts() {
    check_ajax_referer('load_more_posts', 'nonce');

    $GLOBALS['thalim_lang_override'] = sanitize_key( $_POST['lang'] ?? 'fr' );

    $f          = thalim_ajax_read_filters();
    $query_args = thalim_ajax_build_query_args( $f, false );

    // Exclude pinned posts on category pages to avoid duplicates (they already appear at the top,
    // pulled out of the main flow by category.php). Must mirror category.php exactly.
    if ( $f['category'] ) {
        $pinned_ids = thalim_get_active_pinned_ids( $f['category'] );
        if ( ! empty( $pinned_ids ) ) {
            $query_args['post__not_in'] = $pinned_ids;
        }
    }

    $posts = Timber::get_posts($query_args);

    if (empty($posts)) {
        wp_send_json_success(['html' => '']);
        return;
    }

    $cards = thalim_get_cards_data($posts);

    $html = '';
    foreach ($posts as $post) {
        $html .= Timber::compile('partials/post-card.twig', [
            'post'          => $post,
            'card'          => $cards[$post->ID],
            'show_category' => true,
            'type_only'     => $f['category'] > 0, // category pages: type chip only; everywhere else (taxonomy, search, annonces): type or category name
        ]);
    }

    wp_send_json_success(['html' => $html]);
}
add_action('wp_ajax_load_more_posts', 'thalim_load_more_posts');
add_action('wp_ajax_nopriv_load_more_posts', 'thalim_load_more_posts');

/**
 * Build structured data for one agenda slider card.
 */
function thalim_get_agenda_card_data( $post_id, $lang = 'fr' ) {
    $months_fr = ['jan.','fév.','mars','avr.','mai','juin','juil.','août','sept.','oct.','nov.','déc.'];
    $months_en = ['Jan.','Feb.','Mar.','Apr.','May','Jun.','Jul.','Aug.','Sep.','Oct.','Nov.','Dec.'];
    $months    = $lang === 'en' ? $months_en : $months_fr;

    $raw_debut    = get_post_meta( $post_id, 'date_de_debut', true );
    $raw_datetime = get_post_meta( $post_id, 'datetime', true );
    if ( $raw_debut && ! str_starts_with( $raw_debut, '0000' ) ) {
        $ts = strtotime( $raw_debut );
    } elseif ( $raw_datetime && ! str_starts_with( $raw_datetime, '0000' ) ) {
        $ts = strtotime( $raw_datetime );
    } else {
        $ts = get_post_timestamp( $post_id );
    }

    $raw_fin  = get_post_meta( $post_id, 'date_de_fin', true );
    $ts_debut = ( $raw_debut && ! str_starts_with( $raw_debut, '0000' ) ) ? strtotime( $raw_debut ) : 0;
    $ts_fin   = ( $raw_fin   && ! str_starts_with( $raw_fin,   '0000' ) ) ? strtotime( $raw_fin )   : 0;

    // Build date_label — same rules as single.twig sidebar
    $fmt_debut = $ts_debut ? thalim_format_date( $raw_debut, $lang ) : '';
    $fmt_fin   = $ts_fin   ? thalim_format_date( $raw_fin,   $lang ) : '';
    $fmt_dt    = ( $raw_datetime && ! str_starts_with( $raw_datetime, '0000' ) )
                 ? thalim_format_date( $raw_datetime, $lang ) : '';
    $h_debut = substr( get_post_meta( $post_id, 'heure_de_debut', true ) ?: '', 0, 5 );
    $h_fin   = substr( get_post_meta( $post_id, 'heure_de_fin', true ) ?: '', 0, 5 );

    if ( $fmt_debut || $fmt_fin ) {
        if ( $ts_debut && $ts_fin && date( 'Y-m-d', $ts_debut ) === date( 'Y-m-d', $ts_fin ) ) {
            // Same day
            if ( $h_debut && $h_fin ) {
                $date_label = ( $lang === 'en' ? 'On ' : 'Le ' ) . $fmt_debut
                            . ' ' . ( $lang === 'en' ? 'from ' : 'de ' ) . $h_debut
                            . ' ' . ( $lang === 'en' ? 'to '   : 'à '  ) . $h_fin;
            } elseif ( $h_debut ) {
                $date_label = $fmt_debut . ( $lang === 'en' ? ' at ' : ' à ' ) . $h_debut;
            } else {
                $date_label = $fmt_debut;
            }
        } elseif ( $fmt_debut && $fmt_fin ) {
            $date_label = ( $lang === 'en' ? 'From ' : 'Du ' )  . $fmt_debut
                        . ' ' . ( $lang === 'en' ? 'to '   : 'au ' ) . $fmt_fin;
        } elseif ( $fmt_debut ) {
            $date_label = $h_debut
                ? $fmt_debut . ( $lang === 'en' ? ' at ' : ' à ' ) . $h_debut
                : $fmt_debut;
        } else {
            $date_label = ( $lang === 'en' ? 'Until ' : "Jusqu'au " ) . $fmt_fin;
        }
    } elseif ( $fmt_dt ) {
        $date_label = $h_debut
            ? $fmt_dt . ( $lang === 'en' ? ' at ' : ' à ' ) . $h_debut
            : $fmt_dt;
    } else {
        $date_label = '';
    }

    $type_fields = [
        'type_colloque_journee_d_etude', 'type_soutenance', 'type_evenement_culturel',
        'type_media', 'type_captation', 'type_revue_collection', 'type_autre',
    ];
    $type_label = '';
    foreach ( $type_fields as $f ) {
        $v = get_post_meta( $post_id, $f, true );
        if ( $v ) { $type_label = thalim_bilingual( $v, $lang ); break; }
    }
    if ( ! $type_label ) {
        foreach ( get_the_category( $post_id ) as $cat ) {
            if ( $cat->parent ) { $type_label = thalim_cat_name( $cat, $lang ); break; }
        }
    }

    $end_day = $end_month = $end_year = null;
    if ( $ts_fin && date( 'Ymd', $ts_fin ) !== date( 'Ymd', $ts ) ) {
        $end_day   = (int) date( 'j', $ts_fin );
        $end_month = $months[ (int) date( 'n', $ts_fin ) - 1 ];
        $end_year  = (int) date( 'Y', $ts_fin );
    }

    // Séance de séminaire: link to parent séminaire at #seance-{ID}
    $link = get_permalink( $post_id );
    if ( in_array( thalim_cat_id( 'seance' ), wp_list_pluck( get_the_category( $post_id ), 'term_id' ) ) ) {
        $link = thalim_get_seance_link( $post_id );
    }

    return [
        'day'        => (int) date( 'j', $ts ),
        'month'      => $months[ (int) date( 'n', $ts ) - 1 ],
        'year'       => (int) date( 'Y', $ts ),
        'end_day'    => $end_day,
        'end_month'  => $end_month,
        'end_year'   => $end_year,
        'type_label' => $type_label,
        'date_label' => $date_label,
        'lieu'       => thalim_bilingual( get_post_meta( $post_id, 'lieu', true ) ?: '', $lang ),
        'link'       => $link,
    ];
}

function thalim_load_more_agenda() {
    check_ajax_referer( 'load_more_posts', 'nonce' );

    $lang = sanitize_key( $_POST['lang'] ?? 'fr' );
    $GLOBALS['thalim_lang_override'] = $lang;

    $f          = thalim_ajax_read_filters();
    $query_args = thalim_ajax_build_query_args( $f, ! empty( $_POST['include_children'] ) );

    // On first page, count future events to find today's anchor position
    $today_offset = 0;
    if ( (int) $f['page'] === 1 ) {
        $offset_args = $query_args;
        $offset_args['posts_per_page'] = 1;
        $offset_args['no_found_rows']  = false;
        $offset_args['paged']          = 1;
        $today_str = current_time( 'Y-m-d' );
        $existing_filter = $offset_args['thalim_event_date_filter'] ?? [];
        $offset_args['thalim_event_date_filter'] = array_merge(
            $existing_filter,
            [ 'from' => $today_str ]
        );
        $future_query = new \WP_Query( $offset_args );
        $today_offset = (int) $future_query->found_posts;
    }

    $posts = Timber::get_posts( $query_args );
    if ( empty( $posts ) ) {
        $response = [ 'html' => '' ];
        if ( (int) $f['page'] === 1 ) $response['today_offset'] = $today_offset;
        wp_send_json_success( $response );
        return;
    }

    $html = '';
    foreach ( $posts as $post ) {
        $data = thalim_get_agenda_card_data( $post->ID, $lang );
        $html .= Timber::compile( 'partials/agenda-card.twig', array_merge( $data, [ 'post' => $post ] ) );
    }
    $response = [ 'html' => $html ];
    if ( (int) $f['page'] === 1 ) $response['today_offset'] = $today_offset;
    wp_send_json_success( $response );
}
add_action( 'wp_ajax_load_more_agenda',        'thalim_load_more_agenda' );
add_action( 'wp_ajax_nopriv_load_more_agenda', 'thalim_load_more_agenda' );