Group class term dates, single-class embed mode, and offering editing

Group class offerings now carry real dates: the add/edit form takes a
start date plus a sessions control (one-off, or weekly for N sessions;
the end date is computed as start + (N-1) weeks via
Offering::weeklyTermEnd). Dates are validated strictly (Y-m-d) and shown
in the offerings list and on the student-facing class card, including
the weekly session count.

[us_group_classes offering="<id>"] (block attribute offeringId, chosen
from a dropdown of active classes fetched from the public offerings
endpoint) restricts the page to a single class so the enrolment flow can
be embedded on a page dedicated to that class; a pinned class that is no
longer offered reports itself closed instead of falling back to the
catalog.

Offerings are now editable from the admin screen: an Edit button
prefills the shared add/edit form and saving posts usc_action=update.
Updates always preserve the original owner and currency, and non-admin
instructors can only load and update their own offerings. The form also
gains the previously missing description field and an Active toggle (the
admin-UI counterpart of the REST is_active flag) so an edit cannot wipe
data the form never collected.

Closes #59

Co-Authored-By: Claude Fable 5 <[email protected]>

templates/admin/offerings.php

@@ -7,64 +7,111 @@ if (! defined('ABSPATH')) {
     exit;
 }
 
-/** @var list<\Unsupervised\Schedular\Offering\Offering> $offerings */
+/**
+ * @var list<\Unsupervised\Schedular\Offering\Offering> $offerings
+ * @var \Unsupervised\Schedular\Offering\Offering|null  $editing  Offering loaded into the form, or null when adding.
+ */
+
+$baseUrl = admin_url('admin.php?page=us-offerings');
+
+// Prefill the sessions control from the stored term dates: a term longer than
+// one day was created as weekly sessions one week apart.
+$termRecurrence = 'single';
+$termSessions   = 10;
+if ($editing && null !== $editing->termStart && null !== $editing->termEnd && $editing->termEnd !== $editing->termStart) {
+    $termRecurrence = 'weekly';
+    $termSessions   = (int) round(((int) strtotime($editing->termEnd) - (int) strtotime($editing->termStart)) / 604800) + 1;
+}
 ?>
 <div class="wrap">
     <h1><?php esc_html_e('Offerings', 'unsupervised-schedular'); ?></h1>
 
-    <h2><?php esc_html_e('Add Offering', 'unsupervised-schedular'); ?></h2>
+    <h2><?php $editing ? esc_html_e('Edit Offering', 'unsupervised-schedular') : esc_html_e('Add Offering', 'unsupervised-schedular'); ?></h2>
     <form method="post">
         <?php wp_nonce_field('usc_offering_action'); ?>
-        <input type="hidden" name="usc_action" value="add">
+        <?php if ($editing) : ?>
+            <input type="hidden" name="usc_action" value="update">
+            <input type="hidden" name="offering_id" value="<?php echo esc_attr((string) $editing->id); ?>">
+        <?php else : ?>
+            <input type="hidden" name="usc_action" value="add">
+        <?php endif; ?>
         <table class="form-table">
             <tr>
                 <th><label for="title"><?php esc_html_e('Title', 'unsupervised-schedular'); ?></label></th>
-                <td><input type="text" name="title" id="title" class="regular-text" required></td>
+                <td><input type="text" name="title" id="title" class="regular-text" required value="<?php echo esc_attr($editing->title ?? ''); ?>"></td>
             </tr>
             <tr>
                 <th><label for="kind"><?php esc_html_e('Kind', 'unsupervised-schedular'); ?></label></th>
                 <td>
                     <select name="kind" id="kind">
                         <option value="<?php echo esc_attr(Offering::KIND_PRIVATE_LESSON); ?>"><?php esc_html_e('Private lesson', 'unsupervised-schedular'); ?></option>
-                        <option value="<?php echo esc_attr(Offering::KIND_GROUP_CLASS); ?>"><?php esc_html_e('Group class', 'unsupervised-schedular'); ?></option>
+                        <option value="<?php echo esc_attr(Offering::KIND_GROUP_CLASS); ?>" <?php echo $editing && Offering::KIND_GROUP_CLASS === $editing->kind ? 'selected' : ''; ?>><?php esc_html_e('Group class', 'unsupervised-schedular'); ?></option>
                     </select>
                 </td>
             </tr>
+            <tr>
+                <th><label for="description"><?php esc_html_e('Description', 'unsupervised-schedular'); ?></label></th>
+                <td><textarea name="description" id="description" class="large-text" rows="4"><?php echo esc_textarea($editing->description ?? ''); ?></textarea></td>
+            </tr>
             <tr>
                 <th><label for="duration_minutes"><?php esc_html_e('Duration (minutes)', 'unsupervised-schedular'); ?></label></th>
-                <td><input type="number" name="duration_minutes" id="duration_minutes" min="0" step="1"></td>
+                <td><input type="number" name="duration_minutes" id="duration_minutes" min="0" step="1" value="<?php echo esc_attr((string) ($editing->durationMinutes ?? '')); ?>"></td>
             </tr>
             <tr>
                 <th><label for="price"><?php esc_html_e('Price (dollars)', 'unsupervised-schedular'); ?></label></th>
-                <td><input type="number" name="price" id="price" min="0" step="0.01" value="0.00"></td>
+                <td><input type="number" name="price" id="price" min="0" step="0.01" value="<?php echo esc_attr(number_format($editing->price ?? 0.0, 2, '.', '')); ?>"></td>
             </tr>
             <tr>
                 <th><label for="billing_mode"><?php esc_html_e('Billing', 'unsupervised-schedular'); ?></label></th>
                 <td>
                     <select name="billing_mode" id="billing_mode">
                         <option value="<?php echo esc_attr(Offering::BILLING_ONE_TIME); ?>"><?php esc_html_e('One-time at booking', 'unsupervised-schedular'); ?></option>
-                        <option value="<?php echo esc_attr(Offering::BILLING_FULL_TERM); ?>"><?php esc_html_e('Full term upfront', 'unsupervised-schedular'); ?></option>
+                        <option value="<?php echo esc_attr(Offering::BILLING_FULL_TERM); ?>" <?php echo $editing && Offering::BILLING_FULL_TERM === $editing->billingMode ? 'selected' : ''; ?>><?php esc_html_e('Full term upfront', 'unsupervised-schedular'); ?></option>
                     </select>
                 </td>
             </tr>
             <tr>
                 <th><?php esc_html_e('Weekly reservation', 'unsupervised-schedular'); ?></th>
-                <td><label><input type="checkbox" name="allow_weekly" value="1"> <?php esc_html_e('Allow weekly recurring reservation (private)', 'unsupervised-schedular'); ?></label></td>
+                <td><label><input type="checkbox" name="allow_weekly" value="1" <?php echo $editing && $editing->allowWeekly ? 'checked' : ''; ?>> <?php esc_html_e('Allow weekly recurring reservation (private)', 'unsupervised-schedular'); ?></label></td>
             </tr>
             <tr>
                 <th><label for="capacity"><?php esc_html_e('Capacity', 'unsupervised-schedular'); ?></label></th>
-                <td><input type="number" name="capacity" id="capacity" min="0" step="1"> <span class="description"><?php esc_html_e('Group classes only', 'unsupervised-schedular'); ?></span></td>
+                <td><input type="number" name="capacity" id="capacity" min="0" step="1" value="<?php echo esc_attr((string) ($editing->capacity ?? '')); ?>"> <span class="description"><?php esc_html_e('Group classes only', 'unsupervised-schedular'); ?></span></td>
+            </tr>
+            <tr>
+                <th><label for="term_start"><?php esc_html_e('Start date', 'unsupervised-schedular'); ?></label></th>
+                <td>
+                    <input type="date" name="term_start" id="term_start" value="<?php echo esc_attr($editing->termStart ?? ''); ?>">
+                    <span class="description"><?php esc_html_e('Group classes only — date of the first class', 'unsupervised-schedular'); ?></span>
+                </td>
+            </tr>
+            <tr>
+                <th><?php esc_html_e('Sessions', 'unsupervised-schedular'); ?></th>
+                <td>
+                    <label><input type="radio" name="term_recurrence" value="single" <?php echo 'single' === $termRecurrence ? 'checked' : ''; ?>> <?php esc_html_e('One-off', 'unsupervised-schedular'); ?></label>
+                    &nbsp;
+                    <label><input type="radio" name="term_recurrence" value="weekly" <?php echo 'weekly' === $termRecurrence ? 'checked' : ''; ?>> <?php esc_html_e('Weekly for', 'unsupervised-schedular'); ?></label>
+                    <input type="number" name="term_sessions" min="1" max="52" value="<?php echo esc_attr((string) $termSessions); ?>" style="width:5em;"> <?php esc_html_e('sessions', 'unsupervised-schedular'); ?>
+                    <p class="description"><?php esc_html_e('The end date is calculated from the start date and the number of weekly sessions.', 'unsupervised-schedular'); ?></p>
+                </td>
             </tr>
             <tr>
                 <th><label for="schedule_note"><?php esc_html_e('Schedule note', 'unsupervised-schedular'); ?></label></th>
-                <td><input type="text" name="schedule_note" id="schedule_note" class="regular-text" placeholder="<?php esc_attr_e('e.g. Tuesdays 4:00pm', 'unsupervised-schedular'); ?>"></td>
+                <td><input type="text" name="schedule_note" id="schedule_note" class="regular-text" placeholder="<?php esc_attr_e('e.g. Tuesdays 4:00pm', 'unsupervised-schedular'); ?>" value="<?php echo esc_attr($editing->scheduleNote ?? ''); ?>"></td>
             </tr>
             <tr>
                 <th><label for="etransfer_email"><?php esc_html_e('E-transfer email', 'unsupervised-schedular'); ?></label></th>
-                <td><input type="email" name="etransfer_email" id="etransfer_email" class="regular-text" placeholder="<?php esc_attr_e('Overrides the studio default', 'unsupervised-schedular'); ?>"></td>
+                <td><input type="email" name="etransfer_email" id="etransfer_email" class="regular-text" placeholder="<?php esc_attr_e('Overrides the studio default', 'unsupervised-schedular'); ?>" value="<?php echo esc_attr($editing->etransferEmail ?? ''); ?>"></td>
+            </tr>
+            <tr>
+                <th><?php esc_html_e('Active', 'unsupervised-schedular'); ?></th>
+                <td><label><input type="checkbox" name="is_active" value="1" <?php echo null === $editing || $editing->isActive ? 'checked' : ''; ?>> <?php esc_html_e('Open for registration', 'unsupervised-schedular'); ?></label></td>
             </tr>
         </table>
-        <?php submit_button(esc_html__('Add Offering', 'unsupervised-schedular')); ?>
+        <?php submit_button($editing ? esc_html__('Update Offering', 'unsupervised-schedular') : esc_html__('Add Offering', 'unsupervised-schedular')); ?>
+        <?php if ($editing) : ?>
+            <p><a href="<?php echo esc_url($baseUrl); ?>"><?php esc_html_e('Cancel editing', 'unsupervised-schedular'); ?></a></p>
+        <?php endif; ?>
     </form>
 
     <h2><?php esc_html_e('Current Offerings', 'unsupervised-schedular'); ?></h2>
@@ -75,11 +122,13 @@ if (! defined('ABSPATH')) {
         <table class="wp-list-table widefat fixed striped">
             <thead>
                 <tr>
+                    <th style="width:4em;"><?php esc_html_e('ID', 'unsupervised-schedular'); ?></th>
                     <th><?php esc_html_e('Title', 'unsupervised-schedular'); ?></th>
                     <th><?php esc_html_e('Kind', 'unsupervised-schedular'); ?></th>
                     <th><?php esc_html_e('Duration', 'unsupervised-schedular'); ?></th>
                     <th><?php esc_html_e('Price', 'unsupervised-schedular'); ?></th>
                     <th><?php esc_html_e('Billing', 'unsupervised-schedular'); ?></th>
+                    <th><?php esc_html_e('Term', 'unsupervised-schedular'); ?></th>
                     <th><?php esc_html_e('Active', 'unsupervised-schedular'); ?></th>
                     <th><?php esc_html_e('Actions', 'unsupervised-schedular'); ?></th>
                 </tr>
@@ -87,13 +136,24 @@ if (! defined('ABSPATH')) {
             <tbody>
                 <?php foreach ($offerings as $offering) : ?>
                     <tr>
+                        <td><?php echo esc_html((string) $offering->id); ?></td>
                         <td><?php echo esc_html($offering->title); ?></td>
                         <td><?php echo esc_html($offering->kind); ?></td>
                         <td><?php echo $offering->durationMinutes ? esc_html((string) $offering->durationMinutes . ' min') : '&mdash;'; ?></td>
                         <td><?php echo esc_html(number_format($offering->price, 2) . ' ' . $offering->currency); ?></td>
                         <td><?php echo esc_html($offering->billingMode); ?></td>
+                        <td>
+                            <?php if (null === $offering->termStart) : ?>
+                                &mdash;
+                            <?php elseif (null === $offering->termEnd || $offering->termEnd === $offering->termStart) : ?>
+                                <?php echo esc_html((string) mysql2date('M j, Y', $offering->termStart)); ?>
+                            <?php else : ?>
+                                <?php echo esc_html((string) mysql2date('M j, Y', $offering->termStart) . ' – ' . (string) mysql2date('M j, Y', $offering->termEnd)); ?>
+                            <?php endif; ?>
+                        </td>
                         <td><?php echo $offering->isActive ? esc_html__('Yes', 'unsupervised-schedular') : esc_html__('No', 'unsupervised-schedular'); ?></td>
                         <td>
+                            <a class="button button-small" href="<?php echo esc_url(add_query_arg('usc_edit', (int) $offering->id, $baseUrl)); ?>"><?php esc_html_e('Edit', 'unsupervised-schedular'); ?></a>
                             <form method="post" style="display:inline;">
                                 <?php wp_nonce_field('usc_offering_action'); ?>
                                 <input type="hidden" name="usc_action" value="delete">