feat(bridge-ui-v2): switch chain on wrong network

packages/bridge-ui-v2/src/components/ChainSelector/ChainSelector.svelte

@@ -1,14 +1,14 @@
 <script lang="ts">
   import { type Chain, type GetNetworkResult, switchNetwork } from '@wagmi/core';
-  import { type ComponentType, onDestroy } from 'svelte';
+  import { onDestroy } from 'svelte';
   import { t } from 'svelte-i18n';
   import { UserRejectedRequestError } from 'viem';
 
-  import { EthIcon, Icon, TaikoIcon } from '$components/Icon';
+  import { Icon } from '$components/Icon';
   import { LoadingMask } from '$components/LoadingMask';
   import { warningToast } from '$components/NotificationToast';
-  import { PUBLIC_L1_CHAIN_ID, PUBLIC_L2_CHAIN_ID } from '$env/static/public';
   import { chains } from '$libs/chain';
+  import { chainToIconMap } from '$libs/util/chainToIconMap';
   import { classNames } from '$libs/util/classNames';
   import { uid } from '$libs/util/uid';
   import { account } from '$stores/account';
@@ -29,11 +29,6 @@
     'flex justify-start content-center body-bold py-2 px-[20px]',
   );
 
-  let chainToIconMap: Record<string, ComponentType> = {
-    [PUBLIC_L1_CHAIN_ID]: EthIcon,
-    [PUBLIC_L2_CHAIN_ID]: TaikoIcon,
-  };
-
   let switchingNetwork = false;
   let buttonId = `button-${uid()}`;
   let dialogId = `dialog-${uid()}`;
@@ -143,7 +138,7 @@
             tabindex="0"
             class="p-4 rounded-[10px]"
             class:opacity-20={disabled}
-            class:hover:bg-grey-10={!disabled}
+            class:hover:bg-primary-content={!disabled}
             class:hover:cursor-pointer={!disabled}
             aria-disabled={disabled}
             on:click={() => selectChain(chain)}

packages/bridge-ui-v2/src/components/SwitchChainModal/SwitchChainModal.svelte

@@ -0,0 +1,79 @@
+<script lang="ts">
+  import { type Chain, switchNetwork } from '@wagmi/core';
+  import { t } from 'svelte-i18n';
+  import { UserRejectedRequestError } from 'viem';
+
+  import { LoadingMask } from '$components/LoadingMask';
+  import { warningToast } from '$components/NotificationToast';
+  import { chains } from '$libs/chain';
+  import { chainToIconMap } from '$libs/util/chainToIconMap';
+  import { switchChainModal } from '$stores/modal';
+
+  let switchingNetwork = false;
+
+  function closeModal() {
+    $switchChainModal = false;
+  }
+
+  async function selectChain(chain: Chain) {
+    // We want to switch the wallet to the selected network.
+    // This will trigger the network switch in the UI also
+    switchingNetwork = true;
+
+    try {
+      await switchNetwork({ chainId: chain.id });
+      closeModal();
+    } catch (err) {
+      console.error(err);
+
+      if (err instanceof UserRejectedRequestError) {
+        warningToast($t('messages.network.rejected'));
+      }
+    } finally {
+      switchingNetwork = false;
+    }
+  }
+
+  function getChainKeydownHandler(chain: Chain) {
+    return (event: KeyboardEvent) => {
+      if (event.key === 'Enter') {
+        selectChain(chain);
+      }
+    };
+  }
+</script>
+
+<dialog class="modal modal-bottom md:modal-middle" class:modal-open={$switchChainModal}>
+  <div class="modal-box relative px-6 py-[35px] md:py-[20px] bg-primary-base-background text-primary-base-content">
+    {#if switchingNetwork}
+      <LoadingMask
+        class="bg-grey-0/60"
+        spinnerClass="border-primary-base-content"
+        text={$t('messages.network.switching')} />
+    {/if}
+
+    <h3 class="title-body-bold mb-[20px]">{$t('switch_modal.title')}</h3>
+    <p class="body-regular">{$t('switch_modal.description')}</p>
+    <ul role="menu" class="space-y-4">
+      {#each chains as chain (chain.id)}
+        <li
+          role="menuitem"
+          tabindex="0"
+          class="p-4 rounded-[10px] hover:bg-primary-content hover:cursor-pointer"
+          on:click={() => selectChain(chain)}
+          on:keydown={getChainKeydownHandler(chain)}>
+          <!-- TODO: agree on hover:bg color -->
+          <div class="f-row justify-between">
+            <div class="f-items-center space-x-4">
+              <i role="img" aria-label={chain.name}>
+                <svelte:component this={chainToIconMap[chain.id]} size={32} />
+              </i>
+              <span class="body-bold">{chain.name}</span>
+            </div>
+            <span class="body-regular">{chain.network}</span>
+          </div>
+        </li>
+      {/each}
+    </ul>
+  </div>
+</dialog>

packages/bridge-ui-v2/src/components/SwitchChainModal/index.ts

@@ -0,0 +1 @@
+export { default as SwitchChainModal } from './SwitchChainModal.svelte';

packages/bridge-ui-v2/src/i18n/en.json

@@ -214,6 +214,10 @@
       "connecting": "Connecting"
     }
   },
+  "switch_modal": {
+    "title": "Not on the right network",
+    "description": "Your current network is not supported. Please select one:"
+  },
   "messages": {
     "account": {
       "required": "Please connect your wallet.",

packages/bridge-ui-v2/src/libs/util/chainToIconMap.ts

@@ -0,0 +1,10 @@
+import type { ComponentType } from 'svelte';
+
+import { EthIcon, TaikoIcon } from '$components/Icon';
+import { PUBLIC_L1_CHAIN_ID, PUBLIC_L2_CHAIN_ID } from '$env/static/public';
+
+export const chainToIconMap: Record<string, ComponentType> = {
+  [PUBLIC_L1_CHAIN_ID]: EthIcon,
+  [PUBLIC_L2_CHAIN_ID]: TaikoIcon,
+  // TODO: L3
+};

packages/bridge-ui-v2/src/libs/wagmi/watcher.ts

@@ -1,7 +1,9 @@
 import { watchAccount, watchNetwork /*, watchPublicClient, watchWalletClient*/ } from '@wagmi/core';
 
+import { isSupportedChain } from '$libs/chain';
 import { getLogger } from '$libs/util/logger';
 import { account } from '$stores/account';
+import { switchChainModal } from '$stores/modal';
 import { network } from '$stores/network';
 
 const log = getLogger('wagmi:watcher');
@@ -17,9 +19,19 @@ export function startWatching() {
     unWatchNetwork = watchNetwork((data) => {
       log('Network changed', data);
 
+      const { chain } = data;
+
+      // We need to check if the chain is supported, and if not
+      // we present the user with a modal to switch networks.
+      if (chain && !isSupportedChain(BigInt(chain.id))) {
+        log('Unsupported chain', chain);
+        switchChainModal.set(true);
+        return;
+      }
+
       // When we switch networks, we are actually selecting
       // the source chain.
-      network.set(data.chain);
+      network.set(chain);
     });
 
     // Action for subscribing to account changes.

packages/bridge-ui-v2/src/routes/+layout.svelte

@@ -8,6 +8,7 @@
   import { Header } from '$components/Header';
   import { NotificationToast } from '$components/NotificationToast';
   import { SideNavigation } from '$components/SideNavigation';
+  import SwitchChainModal from '$components/SwitchChainModal/SwitchChainModal.svelte';
   import { startWatching, stopWatching } from '$libs/wagmi';
 
   onMount(startWatching);
@@ -30,3 +31,5 @@
 <NotificationToast />
 
 <AccountConnectionToast />
+
+<SwitchChainModal />

packages/bridge-ui-v2/src/stores/modal.ts

@@ -0,0 +1,5 @@
+import { writable } from 'svelte/store';
+
+// We make this global because we need to be able to
+// open and close the modal from anywhere in the app
+export const switchChainModal = writable<boolean>(false);