<?php
/**
 * Require a non-empty title when saving a post from the admin.
 *
 * Uses the same transient / redirect / restore mechanism as pods-save-error-handler.php
 * so content is never lost: the post saves (with empty title), the status is reverted
 * to draft if needed, the editor reopens with all fields restored and an error notice.
 */
add_action( 'save_post', 'thalim_check_post_title_required', 5 );

function thalim_check_post_title_required( $post_id ) {
    if ( wp_is_post_autosave( $post_id ) || wp_is_post_revision( $post_id ) ) {
        return;
    }
    if ( ! is_admin() ) {
        return;
    }
    if ( ( $_POST['action'] ?? '' ) !== 'editpost' ) {
        return;
    }

    $post = get_post( $post_id );
    if ( ! $post || ! post_type_supports( $post->post_type, 'title' ) ) {
        return;
    }

    // Title was provided — nothing to do.
    if ( trim( wp_unslash( $_POST['post_title'] ?? '' ) ) !== '' ) {
        return;
    }

    // Title is empty: store restore transient and signal the redirect handler
    // (same keys as pods-save-error-handler.php so everything is shared).
    $user_id = get_current_user_id();
    $restore = [];

    foreach ( $_POST as $key => $val ) {
        if ( str_starts_with( $key, 'pods_meta_' ) ) {
            $restore[ $key ] = is_array( $val )
                ? array_map( 'wp_unslash', $val )
                : wp_unslash( $val );
        }
    }

    $restore['_msg']   = __( 'Le champ Titre est obligatoire.', 'thalim' );
    $restore['_title'] = ''; // intentionally empty — user must fill it

    set_transient(
        'thalim_pods_restore_' . $post_id . '_' . $user_id,
        $restore,
        10 * MINUTE_IN_SECONDS
    );

    // Signal redirect_post_location (defined in pods-save-error-handler.php):
    // it will revert the post status if needed and redirect to the edit screen.
    $GLOBALS['thalim_pods_error_post_id'] = $post_id;
}