Implement settings reset

ext/bg/js/options.js

@@ -488,3 +488,7 @@ function optionsSave(options) {
         });
     });
 }
+
+function optionsGetDefault() {
+    return optionsUpdateVersion({}, {});
+}

ext/bg/js/settings/backup.js

@@ -339,10 +339,32 @@ function _onSettingsImportFileChange(e) {
 }
 
 
+// Resetting
+
+function _onSettingsResetClick() {
+    $('#settings-reset-modal').modal('show');
+}
+
+async function _onSettingsResetConfirmClick() {
+    $('#settings-reset-modal').modal('hide');
+
+    // Get default options
+    const optionsFull = optionsGetDefault();
+
+    // Assign options
+    await _settingsImportSetOptionsFull(optionsFull);
+
+    // Reload settings page
+    window.location.reload();
+}
+
+
 // Setup
 
 window.addEventListener('DOMContentLoaded', () => {
     document.querySelector('#settings-export').addEventListener('click', _onSettingsExportClick, false);
     document.querySelector('#settings-import').addEventListener('click', _onSettingsImportClick, false);
     document.querySelector('#settings-import-file').addEventListener('change', _onSettingsImportFileChange, false);
+    document.querySelector('#settings-reset').addEventListener('click', _onSettingsResetClick, false);
+    document.querySelector('#settings-reset-modal-confirm').addEventListener('click', _onSettingsResetConfirmClick, false);
 }, false);

ext/bg/settings.html

@@ -867,6 +867,7 @@
                 <div>
                     <button class="btn btn-default" id="settings-export">Export Settings</button>
                     <button class="btn btn-default" id="settings-import">Import Settings</button>
+                    <button class="btn btn-danger" id="settings-reset">Reset Default Settings</button>
                 </div>
 
                 <div hidden><input type="file" id="settings-import-file" accept=".json,application/json"></div>
@@ -916,6 +917,36 @@
                         </div>
                     </div>
                 </div>
+
+                <div class="modal fade" tabindex="-1" role="dialog" id="settings-reset-modal">
+                    <div class="modal-dialog modal-dialog-centered">
+                        <div class="modal-content">
+                            <div class="modal-header">
+                                <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
+                                <h4 class="modal-title">Settings Reset</h4>
+                            </div>
+                            <div class="modal-body">
+                                <p class="text-danger">
+                                    You are about to reset all Yomichan settings back to their default values.
+                                    This will delete all custom profiles you may have created.
+                                    <strong>This action cannot be undone.</strong>
+                                </p>
+                                <p>
+                                    Consider making a backup using the "Export Settings" button before resetting
+                                    if you want to be able to revert.
+                                </p>
+                                <p>
+                                    Dictionary data will not be deleted, but any installed dictionaries
+                                    will need to be re-enabled.
+                                </p>
+                            </div>
+                            <div class="modal-footer">
+                                <button type="button" class="btn btn-default" data-dismiss="modal">Cancel</button>
+                                <button type="button" class="btn btn-danger" id="settings-reset-modal-confirm">Reset All Settings</button>
+                            </div>
+                        </div>
+                    </div>
+                </div>
             </div>
 
             <div>