<?php
/**
 * Radio — self-hosted update checker against the Gitea repo.
 *
 * Direct port of the Buddy / Logbook updater (proven in production).
 * Polls Gitea's /releases/latest, falls back to /tags?limit=1 when no
 * formal Release object exists, compares against RADIO_VERSION,
 * renders an Updates panel on the Settings page. Cached 12h on
 * success, 1h on negative responses.
 *
 * Repo coordinates are constants you can override via define() in
 * wp-config.php if the repo ever moves.
 */

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

if ( ! defined( 'RADIO_GITEA_HOST' ) )  { define( 'RADIO_GITEA_HOST',  'https://git.davidtkeane.com' ); }
if ( ! defined( 'RADIO_GITEA_OWNER' ) ) { define( 'RADIO_GITEA_OWNER', 'ranger' ); }
if ( ! defined( 'RADIO_GITEA_REPO' ) )  { define( 'RADIO_GITEA_REPO',  'a-radio' ); }

function radio_gitea_repo_url() {
    return RADIO_GITEA_HOST . '/' . RADIO_GITEA_OWNER . '/' . RADIO_GITEA_REPO;
}
function radio_gitea_releases_url() {
    return radio_gitea_repo_url() . '/releases';
}

/**
 * Fetch the latest release/tag, normalised. Returns null on hard
 * error, or an array including `version`.
 */
function radio_fetch_latest_release( $force_refresh = false ) {
    $cache_key = 'radio_gitea_latest';

    if ( ! $force_refresh ) {
        $cached = get_site_transient( $cache_key );
        if ( is_array( $cached ) ) { return $cached; }
    }

    $base_api = RADIO_GITEA_HOST . '/api/v1/repos/' . RADIO_GITEA_OWNER . '/' . RADIO_GITEA_REPO;

    // Try formal Release first.
    $response = wp_remote_get( $base_api . '/releases/latest', array( 'timeout' => 8 ) );
    if ( is_wp_error( $response ) ) { return null; }

    $code = (int) wp_remote_retrieve_response_code( $response );
    $body = ( $code === 200 ) ? json_decode( wp_remote_retrieve_body( $response ), true ) : null;

    // Fallback to /tags if no Release object exists yet.
    if ( $code !== 200 || ! is_array( $body ) || empty( $body['tag_name'] ) ) {
        $tags_response = wp_remote_get( $base_api . '/tags?limit=1', array( 'timeout' => 8 ) );
        if ( ! is_wp_error( $tags_response )
            && (int) wp_remote_retrieve_response_code( $tags_response ) === 200 ) {
            $tags = json_decode( wp_remote_retrieve_body( $tags_response ), true );
            if ( is_array( $tags ) && ! empty( $tags[0]['name'] ) ) {
                $body = array(
                    'tag_name'     => $tags[0]['name'],
                    'html_url'     => radio_gitea_repo_url() . '/src/tag/' . rawurlencode( $tags[0]['name'] ),
                    'body'         => isset( $tags[0]['message'] ) ? $tags[0]['message'] : '',
                    'published_at' => isset( $tags[0]['commit']['created'] ) ? $tags[0]['commit']['created'] : null,
                    'assets'       => array(),
                );
                $code = 200;
            }
        }
    }

    if ( $code !== 200 || ! is_array( $body ) || empty( $body['tag_name'] ) ) {
        $info = array(
            'version'      => null,
            'html_url'     => radio_gitea_releases_url(),
            'download_url' => null,
            'body'         => '',
            'published_at' => null,
            'error_code'   => $code,
        );
        set_site_transient( $cache_key, $info, HOUR_IN_SECONDS );
        return $info;
    }

    $version = ltrim( (string) $body['tag_name'], 'vV' );

    // Prefer a .zip asset; fall back to Gitea source-archive URL.
    $download_url = null;
    if ( ! empty( $body['assets'] ) && is_array( $body['assets'] ) ) {
        foreach ( $body['assets'] as $asset ) {
            if ( isset( $asset['name'], $asset['browser_download_url'] )
                && substr( strtolower( $asset['name'] ), -4 ) === '.zip' ) {
                $download_url = $asset['browser_download_url'];
                break;
            }
        }
    }
    if ( ! $download_url ) {
        $download_url = radio_gitea_repo_url() . '/archive/' . rawurlencode( $body['tag_name'] ) . '.zip';
    }

    $info = array(
        'version'      => $version,
        'html_url'     => isset( $body['html_url'] ) ? esc_url_raw( $body['html_url'] ) : '',
        'download_url' => esc_url_raw( $download_url ),
        'body'         => isset( $body['body'] ) ? wp_strip_all_tags( $body['body'] ) : '',
        'published_at' => isset( $body['published_at'] ) ? $body['published_at'] : null,
    );

    set_site_transient( $cache_key, $info, 12 * HOUR_IN_SECONDS );
    return $info;
}

function radio_update_status( $force_refresh = false ) {
    $current = defined( 'RADIO_VERSION' ) ? RADIO_VERSION : '0.0.0';
    $latest  = radio_fetch_latest_release( $force_refresh );

    if ( ! $latest || empty( $latest['version'] ) ) {
        $msg = __( 'No releases tagged on the Gitea repo yet.', 'radio' );
        if ( $latest && ! empty( $latest['error_code'] ) && (int) $latest['error_code'] !== 404 ) {
            $msg = sprintf( __( 'Could not reach Gitea (HTTP %d). Try again in a few minutes.', 'radio' ), (int) $latest['error_code'] );
        }
        return array(
            'status'   => 'unknown',
            'current'  => $current,
            'message'  => $msg,
            'repo_url' => radio_gitea_repo_url(),
        );
    }

    if ( version_compare( $latest['version'], $current, '>' ) ) {
        return array(
            'status'       => 'available',
            'current'      => $current,
            'latest'       => $latest['version'],
            'html_url'     => $latest['html_url'],
            'download_url' => $latest['download_url'],
            'published_at' => $latest['published_at'],
            'body'         => $latest['body'],
            'message'      => sprintf( __( 'A new version (v%1$s) is available — you are on v%2$s.', 'radio' ), $latest['version'], $current ),
        );
    }

    return array(
        'status'   => 'up-to-date',
        'current'  => $current,
        'latest'   => $latest['version'],
        'message'  => sprintf( __( 'You are up to date (v%s).', 'radio' ), $current ),
        'repo_url' => radio_gitea_repo_url(),
    );
}

add_action( 'wp_ajax_radio_check_updates', 'radio_ajax_check_updates' );
function radio_ajax_check_updates() {
    if ( ! current_user_can( 'manage_options' ) ) {
        wp_send_json_error( 'Insufficient permissions.', 403 );
    }
    check_ajax_referer( 'radio_check_updates', 'nonce' );
    delete_site_transient( 'radio_gitea_latest' );
    wp_send_json_success( radio_update_status( true ) );
}

function radio_render_updates_panel() {
    $status   = radio_update_status( false );
    $nonce    = wp_create_nonce( 'radio_check_updates' );
    $repo_url = radio_gitea_repo_url();
    $rel_url  = radio_gitea_releases_url();
    ?>
    <div class="radio-updates" style="max-width:720px; margin-top:24px; padding:18px 20px; background:#fff; border:1px solid #ccd0d4; border-radius:4px;">
        <h2 style="margin-top:0;"><?php esc_html_e( 'Updates', 'radio' ); ?></h2>
        <p style="margin:0 0 12px;">
            <?php esc_html_e( 'Radio is self-hosted on Gitea. Click Check now to ask the repo whether there is a newer release than the one you are running.', 'radio' ); ?>
        </p>

        <p id="radio-update-status" style="margin:0 0 12px;">
            <strong><?php esc_html_e( 'Status:', 'radio' ); ?></strong>
            <span id="radio-update-status-text"><?php echo esc_html( $status['message'] ); ?></span>
            <?php if ( $status['status'] === 'available' && ! empty( $status['download_url'] ) ) : ?>
                <br>
                <a href="<?php echo esc_url( $status['download_url'] ); ?>" class="button button-primary" style="margin-top:8px;">
                    <?php
                    /* translators: %s is the latest version number, e.g. "0.2.0" */
                    echo esc_html( sprintf( __( 'Download v%s (.zip)', 'radio' ), $status['latest'] ) );
                    ?>
                </a>
                <?php if ( ! empty( $status['html_url'] ) ) : ?>
                    <a href="<?php echo esc_url( $status['html_url'] ); ?>" target="_blank" rel="noopener" style="margin-left:8px;"><?php esc_html_e( 'View release notes →', 'radio' ); ?></a>
                <?php endif; ?>
            <?php endif; ?>
        </p>

        <p style="margin:0 0 4px;">
            <button type="button" id="radio-check-updates-btn" class="button" data-nonce="<?php echo esc_attr( $nonce ); ?>">
                ↻ <?php esc_html_e( 'Check now', 'radio' ); ?>
            </button>
            <a href="<?php echo esc_url( $repo_url ); ?>" target="_blank" rel="noopener" class="button" style="margin-left:6px;"><?php esc_html_e( 'View on Gitea', 'radio' ); ?></a>
            <a href="<?php echo esc_url( $rel_url ); ?>"  target="_blank" rel="noopener" class="button" style="margin-left:6px;"><?php esc_html_e( 'View all releases', 'radio' ); ?></a>
        </p>
        <p style="margin:10px 0 0; color:#646970; font-size:12px;">
            <?php esc_html_e( 'Manual update path: download the .zip, deactivate the plugin in WordPress, upload via Plugins → Add New → Upload, reactivate. Your settings survive the upgrade (state is stored in user_meta).', 'radio' ); ?>
        </p>
    </div>

    <script>
    (function () {
        var btn = document.getElementById('radio-check-updates-btn');
        var statusText = document.getElementById('radio-update-status-text');
        if (!btn || !statusText) { return; }

        btn.addEventListener('click', function () {
            var nonce = btn.getAttribute('data-nonce');
            btn.disabled = true;
            var orig = btn.textContent;
            btn.textContent = '↻ Checking…';
            statusText.textContent = 'Asking Gitea…';

            var fd = new FormData();
            fd.append('action', 'radio_check_updates');
            fd.append('nonce',  nonce);

            fetch(ajaxurl, { method: 'POST', credentials: 'same-origin', body: fd })
                .then(function (r) { return r.json(); })
                .then(function (res) {
                    if (!res || !res.success) {
                        statusText.textContent = (res && res.data) ? String(res.data) : 'Check failed.';
                    } else {
                        statusText.textContent = res.data.message || 'Check complete.';
                        if (res.data.status === 'available' && res.data.download_url) {
                            setTimeout(function () { window.location.reload(); }, 400);
                        }
                    }
                })
                .catch(function () { statusText.textContent = 'Network error — try again in a moment.'; })
                .finally(function () {
                    btn.disabled = false;
                    btn.textContent = orig;
                });
        });
    })();
    </script>
    <?php
}