<?php
/**
 * Oribi Sync — Admin settings page.
 *
 * Registers the Settings → Oribi Sync page, handles saving,
 * and provides the "Sync Now" action.
 */

if ( ! defined( 'ABSPATH' ) ) exit;

// ─── Register admin menu ──────────────────────────────────────────────────────
add_action( 'admin_menu', function () {
    add_options_page(
        'Oribi Sync',
        'Oribi Sync',
        'manage_options',
        'oribi-sync',
        'oribi_sync_settings_page'
    );
} );

// ─── Enqueue admin CSS on our page only ───────────────────────────────────────
add_action( 'admin_enqueue_scripts', function ( $hook ) {
    if ( $hook !== 'settings_page_oribi-sync' ) return;
    wp_enqueue_style( 'oribi-sync-admin', ORIBI_SYNC_URL . 'assets/admin.css', [], ORIBI_SYNC_VERSION );
} );

// ─── Handle form submissions ──────────────────────────────────────────────────
add_action( 'admin_post_oribi_sync_save_settings', function () {
    if ( ! current_user_can( 'manage_options' ) ) wp_die( 'Permission denied.' );
    check_admin_referer( 'oribi_sync_save_settings' );

    $repo   = sanitize_text_field( wp_unslash( $_POST['oribi_sync_repo'] ?? '' ) );
    $branch = sanitize_text_field( wp_unslash( $_POST['oribi_sync_branch'] ?? 'main' ) );
    $provider = sanitize_text_field( wp_unslash( $_POST['oribi_sync_provider'] ?? '' ) );
    $pat    = wp_unslash( $_POST['oribi_sync_pat'] ?? '' );

    $pages_folder = sanitize_text_field( wp_unslash( $_POST['oribi_sync_pages_folder'] ?? '' ) );

    update_option( 'oribi_sync_repo',          $repo,         'no' );
    update_option( 'oribi_sync_branch',        $branch,       'no' );
    update_option( 'oribi_sync_provider',      $provider,     'no' );
    update_option( 'oribi_sync_pages_folder',  $pages_folder, 'no' );

    // Only update PAT if a new one was provided (non-empty)
    if ( ! empty( $pat ) ) {
        oribi_sync_save_pat( $pat );
    }

    wp_redirect( add_query_arg( 'oribi_sync_saved', '1', admin_url( 'options-general.php?page=oribi-sync' ) ) );
    exit;
} );

add_action( 'admin_post_oribi_sync_run', function () {
    if ( ! current_user_can( 'manage_options' ) ) wp_die( 'Permission denied.' );
    check_admin_referer( 'oribi_sync_run' );

    $result = oribi_sync_run();

    // After pulling, push any local changes back to the repo
    $push = oribi_sync_push_all();
    $result['push'] = $push['results'];

    set_transient( 'oribi_sync_result', $result, 60 );

    wp_redirect( add_query_arg( 'oribi_sync_done', '1', admin_url( 'options-general.php?page=oribi-sync' ) ) );
    exit;
} );

add_action( 'admin_post_oribi_sync_dry_run', function () {
    if ( ! current_user_can( 'manage_options' ) ) wp_die( 'Permission denied.' );
    check_admin_referer( 'oribi_sync_dry_run' );

    $result = oribi_sync_run( true );

    set_transient( 'oribi_sync_result', $result, 60 );

    wp_redirect( add_query_arg( 'oribi_sync_done', 'dry', admin_url( 'options-general.php?page=oribi-sync' ) ) );
    exit;
} );

add_action( 'admin_post_oribi_sync_clear_pat', function () {
    if ( ! current_user_can( 'manage_options' ) ) wp_die( 'Permission denied.' );
    check_admin_referer( 'oribi_sync_clear_pat' );

    delete_option( 'oribi_sync_pat' );

    wp_redirect( add_query_arg( 'oribi_sync_saved', 'pat_cleared', admin_url( 'options-general.php?page=oribi-sync' ) ) );
    exit;
} );

// ─── Push page(s) to repo ─────────────────────────────────────────────────────
add_action( 'admin_post_oribi_sync_push', function () {
    if ( ! current_user_can( 'manage_options' ) ) wp_die( 'Permission denied.' );
    check_admin_referer( 'oribi_sync_push' );

    $post_id = (int) ( $_POST['oribi_sync_push_post_id'] ?? 0 );

    if ( $post_id > 0 ) {
        $result = oribi_sync_push_page( $post_id );
        set_transient( 'oribi_sync_push_result', $result, 60 );
    }

    wp_redirect( add_query_arg( 'oribi_sync_pushed', '1', admin_url( 'options-general.php?page=oribi-sync' ) ) );
    exit;
} );

add_action( 'admin_post_oribi_sync_push_all', function () {
    if ( ! current_user_can( 'manage_options' ) ) wp_die( 'Permission denied.' );
    check_admin_referer( 'oribi_sync_push_all' );

    $result = oribi_sync_push_all();
    set_transient( 'oribi_sync_push_result', $result, 60 );

    wp_redirect( add_query_arg( 'oribi_sync_pushed', 'all', admin_url( 'options-general.php?page=oribi-sync' ) ) );
    exit;
} );

// ─── Settings page renderer ──────────────────────────────────────────────────
function oribi_sync_settings_page() {
    if ( ! current_user_can( 'manage_options' ) ) return;

    $repo          = get_option( 'oribi_sync_repo', '' );
    $branch        = get_option( 'oribi_sync_branch', 'main' );
    $provider      = get_option( 'oribi_sync_provider', '' );
    $pages_folder  = get_option( 'oribi_sync_pages_folder', '' );
    $has_pat       = ! empty( get_option( 'oribi_sync_pat', '' ) );
    $last_run      = get_option( 'oribi_sync_last_run', '' );
    $log           = get_option( 'oribi_sync_log', [] );

    // Transient results
    $sync_result = get_transient( 'oribi_sync_result' );
    if ( $sync_result ) delete_transient( 'oribi_sync_result' );
    $push_result = get_transient( 'oribi_sync_push_result' );
    if ( $push_result ) delete_transient( 'oribi_sync_push_result' );

    $saved  = $_GET['oribi_sync_saved']  ?? '';
    $done   = $_GET['oribi_sync_done']   ?? '';
    ?>
    <div class="wrap oribi-sync-wrap">
        <h1>Oribi Sync</h1>

        <?php // ── Flash notices ──────────────────────────────────────────── ?>
        <?php if ( $saved === '1' ): ?>
            <div class="notice notice-success is-dismissible"><p>Settings saved.</p></div>
        <?php elseif ( $saved === 'pat_cleared' ): ?>
            <div class="notice notice-warning is-dismissible"><p>PAT cleared.</p></div>
        <?php endif; ?>

        <?php if ( $sync_result ): ?>
            <div class="notice <?php echo $sync_result['ok'] ? 'notice-success' : 'notice-error'; ?> is-dismissible">
                <p><strong><?php echo $done === 'dry' ? 'Dry-run results' : 'Sync complete'; ?></strong></p>
                <?php oribi_sync_render_result_list( $sync_result ); ?>
            </div>
        <?php endif; ?>

        <?php if ( $push_result ): ?>
            <?php if ( isset( $push_result['results'] ) ): ?>
                <div class="notice <?php echo $push_result['ok'] ? 'notice-success' : 'notice-warning'; ?> is-dismissible">
                    <p><strong>Push results</strong></p>
                    <ul class="oribi-sync-result-list">
                        <?php foreach ( $push_result['results'] as $pr ): ?>
                            <li>
                                <strong><?php echo esc_html( $pr['slug'] ?? '' ); ?></strong> —
                                <?php echo esc_html( $pr['message'] ?? '' ); ?>
                                <?php if ( ! empty( $pr['pr_url'] ) ): ?>
                                    <a href="<?php echo esc_url( $pr['pr_url'] ); ?>" target="_blank" rel="noopener">PR →</a>
                                <?php endif; ?>
                            </li>
                        <?php endforeach; ?>
                    </ul>
                </div>
            <?php else: ?>
                <div class="notice <?php echo $push_result['ok'] ? 'notice-success' : 'notice-error'; ?> is-dismissible">
                    <p>
                        <?php if ( ! empty( $push_result['pr_url'] ) ): ?>
                            Conflict — opened <a href="<?php echo esc_url( $push_result['pr_url'] ); ?>" target="_blank" rel="noopener">pull request</a> for review.
                        <?php else: ?>
                            <?php echo esc_html( $push_result['message'] ?? '' ); ?>
                        <?php endif; ?>
                    </p>
                </div>
            <?php endif; ?>
        <?php endif; ?>

        <?php // ── Settings form ──────────────────────────────────────────── ?>
        <form method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>" class="oribi-sync-form">
            <input type="hidden" name="action" value="oribi_sync_save_settings" />
            <?php wp_nonce_field( 'oribi_sync_save_settings' ); ?>

            <table class="form-table" role="presentation">
                <tr>
                    <th scope="row"><label for="oribi_sync_repo">Repository URL</label></th>
                    <td>
                        <input type="url" name="oribi_sync_repo" id="oribi_sync_repo"
                               value="<?php echo esc_attr( $repo ); ?>"
                               class="regular-text" placeholder="https://gitea.example.com/owner/repo" />
                    </td>
                </tr>
                <tr>
                    <th scope="row"><label for="oribi_sync_provider">Provider</label></th>
                    <td>
                        <select name="oribi_sync_provider" id="oribi_sync_provider" class="regular-text">
                            <option value=""<?php selected( $provider, '' ); ?>>Auto-detect</option>
                            <?php foreach ( oribi_sync_providers() as $key => $label ): ?>
                                <option value="<?php echo esc_attr( $key ); ?>"<?php selected( $provider, $key ); ?>>
                                    <?php echo esc_html( $label ); ?>
                                </option>
                            <?php endforeach; ?>
                        </select>
                    </td>
                </tr>
                <tr>
                    <th scope="row"><label for="oribi_sync_branch">Branch</label></th>
                    <td>
                        <input type="text" name="oribi_sync_branch" id="oribi_sync_branch"
                               value="<?php echo esc_attr( $branch ); ?>"
                               class="regular-text" placeholder="main" />
                    </td>
                </tr>
                <tr>
                    <th scope="row"><label for="oribi_sync_pat">Access Token</label></th>
                    <td>
                        <input type="password" name="oribi_sync_pat" id="oribi_sync_pat"
                               value="" class="regular-text"
                               placeholder="<?php echo $has_pat ? '••••••••  (saved)' : 'token'; ?>"
                               autocomplete="off" />
                        <p class="description">
                            Needs <strong>write</strong> scope to push pages. Stored encrypted.
                            <?php if ( $has_pat ): ?>
                                <a href="<?php echo esc_url( wp_nonce_url( admin_url( 'admin-post.php?action=oribi_sync_clear_pat' ), 'oribi_sync_clear_pat' ) ); ?>"
                                   onclick="return confirm('Clear the stored PAT?');"
                                   class="oribi-sync-danger-link">Clear</a>
                            <?php endif; ?>
                        </p>
                    </td>
                </tr>
                <tr>
                    <th scope="row"><label for="oribi_sync_pages_folder">Pages Folder</label></th>
                    <td>
                        <select name="oribi_sync_pages_folder" id="oribi_sync_pages_folder" class="regular-text">
                            <option value="">— Select —</option>
                            <?php if ( ! empty( $pages_folder ) ): ?>
                                <option value="<?php echo esc_attr( $pages_folder ); ?>" selected>
                                    <?php echo esc_html( $pages_folder ); ?>
                                </option>
                            <?php endif; ?>
                        </select>
                        <button type="button" id="oribi-load-folders" class="button">Load</button>
                        <span id="oribi-folders-status" class="oribi-sync-muted"></span>
                        <p class="description">Sub-folder inside <code>Pages/</code> to sync from.</p>
                    </td>
                </tr>
            </table>

            <?php submit_button( 'Save Settings' ); ?>
        </form>

        <hr />

        <?php // ── Actions ────────────────────────────────────────────────── ?>
        <h2>Actions</h2>
        <p class="oribi-sync-actions">
            <a href="<?php echo esc_url( wp_nonce_url( admin_url( 'admin-post.php?action=oribi_sync_run' ), 'oribi_sync_run' ) ); ?>"
               class="button button-primary"
               onclick="return confirm('Pull from repo then push local changes. Continue?');">
                Sync (Pull &amp; Push)
            </a>
            <a href="<?php echo esc_url( wp_nonce_url( admin_url( 'admin-post.php?action=oribi_sync_dry_run' ), 'oribi_sync_dry_run' ) ); ?>"
               class="button">
                Dry Run
            </a>
            <a href="<?php echo esc_url( wp_nonce_url( admin_url( 'admin-post.php?action=oribi_sync_theme_preview' ), 'oribi_sync_theme_preview' ) ); ?>"
               class="button">
                Preview Theme
            </a>
            <a href="<?php echo esc_url( wp_nonce_url( admin_url( 'admin-post.php?action=oribi_sync_push_all' ), 'oribi_sync_push_all' ) ); ?>"
               class="button"
               onclick="return confirm('Push ALL synced pages to the repo?');">
                Push All
            </a>
        </p>
        <?php if ( $last_run ): ?>
            <p class="oribi-sync-muted">Last sync: <?php echo esc_html( $last_run ); ?></p>
        <?php endif; ?>

        <?php // ── Synced pages ───────────────────────────────────────────── ?>
        <?php
        $synced_pages = new WP_Query( [
            'post_type'      => 'page',
            'post_status'    => 'publish',
            'meta_key'       => '_oribi_sync_checksum',
            'posts_per_page' => -1,
            'orderby'        => 'title',
            'order'          => 'ASC',
        ] );

        if ( $synced_pages->have_posts() ): ?>
            <table class="widefat fixed striped oribi-sync-pages">
                <thead><tr>
                    <th>Page</th>
                    <th style="width:80px;">Push</th>
                </tr></thead>
                <tbody>
                <?php while ( $synced_pages->have_posts() ): $synced_pages->the_post();
                    $pid       = get_the_ID();
                    $last_push = get_post_meta( $pid, '_oribi_sync_last_push', true );
                    $pr_url    = get_post_meta( $pid, '_oribi_sync_pr_url', true );
                ?>
                    <tr>
                        <td>
                            <strong><?php the_title(); ?></strong>
                            <span class="oribi-sync-muted">/<?php echo esc_html( get_post_field( 'post_name', $pid ) ); ?></span>
                            <?php if ( $pr_url ): ?>
                                <a href="<?php echo esc_url( $pr_url ); ?>" target="_blank" rel="noopener" class="oribi-sync-pr-badge">PR</a>
                            <?php endif; ?>
                            <?php if ( $last_push ): ?>
                                <br /><span class="oribi-sync-muted">pushed <?php echo esc_html( $last_push ); ?></span>
                            <?php endif; ?>
                        </td>
                        <td>
                            <form method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>" style="margin:0;">
                                <input type="hidden" name="action" value="oribi_sync_push" />
                                <input type="hidden" name="oribi_sync_push_post_id" value="<?php echo esc_attr( $pid ); ?>" />
                                <?php wp_nonce_field( 'oribi_sync_push' ); ?>
                                <button type="submit" class="button button-small">Push</button>
                            </form>
                        </td>
                    </tr>
                <?php endwhile; wp_reset_postdata(); ?>
                </tbody>
            </table>
        <?php endif; ?>

        <?php // ── Theme preview (conditional) ────────────────────────────── ?>
        <?php if ( isset( $_GET['oribi_sync_tab'] ) && $_GET['oribi_sync_tab'] === 'theme' ): ?>
            <hr />
            <h2>Theme Files Preview</h2>
            <?php oribi_sync_render_theme_preview(); ?>
        <?php endif; ?>

        <?php // ── Log ────────────────────────────────────────────────────── ?>
        <?php if ( ! empty( $log ) ): ?>
            <hr />
            <details>
                <summary>Sync Log (<?php echo count( $log ); ?>)</summary>
                <table class="widefat fixed striped oribi-sync-log">
                    <thead><tr>
                        <th style="width:150px;">Time</th>
                        <th>Created</th>
                        <th>Updated</th>
                        <th>Errors</th>
                    </tr></thead>
                    <tbody>
                    <?php foreach ( array_slice( $log, 0, 10 ) as $entry ): ?>
                        <tr>
                            <td><?php echo esc_html( $entry['time'] ?? '—' ); ?></td>
                            <td><?php echo esc_html( implode( ', ', $entry['created'] ?? [] ) ?: '—' ); ?></td>
                            <td><?php echo esc_html( implode( ', ', array_merge( $entry['updated'] ?? [], $entry['theme_updated'] ?? [] ) ) ?: '—' ); ?></td>
                            <td class="oribi-sync-error-text"><?php echo esc_html( implode( '; ', $entry['errors'] ?? [] ) ?: '—' ); ?></td>
                        </tr>
                    <?php endforeach; ?>
                    </tbody>
                </table>
            </details>
        <?php endif; ?>
    </div>

    <script>
    (function () {
        var btn    = document.getElementById('oribi-load-folders');
        var select = document.getElementById('oribi_sync_pages_folder');
        var status = document.getElementById('oribi-folders-status');
        if ( ! btn || ! select ) return;

        btn.addEventListener('click', function () {
            status.textContent = 'Loading…';
            btn.disabled = true;

            fetch('<?php echo esc_js( rest_url( 'oribi-sync/v1/repo-folders' ) ); ?>', {
                method: 'GET',
                headers: { 'X-WP-Nonce': '<?php echo esc_js( wp_create_nonce( 'wp_rest' ) ); ?>' }
            })
            .then(function (r) { return r.json(); })
            .then(function (data) {
                if ( data.error ) { status.textContent = '✗ ' + data.error; btn.disabled = false; return; }
                var currentVal = select.value;
                while ( select.options.length > 1 ) select.remove(1);
                if ( ! data.folders || ! data.folders.length ) { status.textContent = 'No folders found.'; btn.disabled = false; return; }
                data.folders.forEach(function (f) {
                    var o = document.createElement('option');
                    o.value = f; o.textContent = f;
                    if ( f === currentVal ) o.selected = true;
                    select.appendChild(o);
                });
                if ( currentVal && select.querySelector('option[value="' + currentVal + '"]') ) select.value = currentVal;
                status.textContent = data.folders.length + ' folder(s).';
                btn.disabled = false;
            })
            .catch(function () { status.textContent = '✗ Request failed.'; btn.disabled = false; });
        });
    })();
    </script>
    <?php
}

/**
 * Render a sync result as a compact <ul>.
 */
function oribi_sync_render_result_list( array $r ): void {
    $items = [];
    if ( ! empty( $r['created'] ) )       $items[] = 'Created: ' . implode( ', ', $r['created'] );
    if ( ! empty( $r['updated'] ) )       $items[] = 'Updated: ' . implode( ', ', $r['updated'] );
    if ( ! empty( $r['theme_updated'] ) ) $items[] = 'Theme: '   . implode( ', ', $r['theme_updated'] );
    if ( ! empty( $r['trashed'] ) )       $items[] = 'Trashed: ' . implode( ', ', $r['trashed'] );
    if ( ! empty( $r['skipped'] ) )       $items[] = 'Skipped: ' . implode( ', ', $r['skipped'] );
    if ( ! empty( $r['errors'] ) )        $items[] = 'Errors: '  . implode( '; ', $r['errors'] );

    if ( empty( $items ) ) { echo '<p>No changes.</p>'; return; }

    echo '<ul class="oribi-sync-result-list">';
    foreach ( $items as $item ) {
        $class = ( strpos( $item, 'Errors:' ) === 0 ) ? ' class="oribi-sync-error-text"' : '';
        echo '<li' . $class . '>' . esc_html( $item ) . '</li>';
    }

    // Append push results if present
    if ( ! empty( $r['push'] ) && is_array( $r['push'] ) ) {
        foreach ( $r['push'] as $pr ) {
            $slug = $pr['slug'] ?? '';
            $msg  = $pr['message'] ?? '';
            $url  = $pr['pr_url'] ?? '';
            $text = "Pushed: {$slug} — {$msg}";
            $cls  = $pr['ok'] ? '' : ' class="oribi-sync-error-text"';
            echo '<li' . $cls . '>' . esc_html( $text );
            if ( $url ) {
                echo ' <a href="' . esc_url( $url ) . '" target="_blank" rel="noopener">PR →</a>';
            }
            echo '</li>';
        }
    }

    echo '</ul>';
}