From 038ec4245bccbb3a0d93ffa346c1ce2a07111a90 Mon Sep 17 00:00:00 2001
From: Marcos Rodriguez Velez <marcospr@pm.me>
Date: Sat, 9 Mar 2024 15:21:06 -0400
Subject: [PATCH] ADD: Discard changes prompt

---
 .../xcschemes/BlueWallet-NoLDK.xcscheme       |  2 +-
 loc/en.json                                   |  2 +
 screen/wallets/viewEditMultisigCosigners.tsx  | 59 ++++++++++++++++++-
 3 files changed, 60 insertions(+), 3 deletions(-)

diff --git a/ios/BlueWallet.xcodeproj/xcshareddata/xcschemes/BlueWallet-NoLDK.xcscheme b/ios/BlueWallet.xcodeproj/xcshareddata/xcschemes/BlueWallet-NoLDK.xcscheme
index e3d93fbf9..a79d28974 100644
--- a/ios/BlueWallet.xcodeproj/xcshareddata/xcschemes/BlueWallet-NoLDK.xcscheme
+++ b/ios/BlueWallet.xcodeproj/xcshareddata/xcschemes/BlueWallet-NoLDK.xcscheme
@@ -48,7 +48,7 @@
       shouldAutocreateTestPlan = "YES">
    </TestAction>
    <LaunchAction
-      buildConfiguration = "Release"
+      buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       launchStyle = "0"
diff --git a/loc/en.json b/loc/en.json
index 994086bb8..94ced7c91 100644
--- a/loc/en.json
+++ b/loc/en.json
@@ -4,6 +4,8 @@
     "cancel": "Cancel",
     "continue": "Continue",
     "clipboard": "Clipboard",
+    "discard_changes": "Discard changes?",
+    "discard_changes_explain": "You have unsaved changes. Are you sure you want to discard them and leave the screen?",
     "enter_password": "Enter password",
     "never": "Never",
     "of": "{number} of {total}",
diff --git a/screen/wallets/viewEditMultisigCosigners.tsx b/screen/wallets/viewEditMultisigCosigners.tsx
index e07a997b6..47af41eec 100644
--- a/screen/wallets/viewEditMultisigCosigners.tsx
+++ b/screen/wallets/viewEditMultisigCosigners.tsx
@@ -3,6 +3,7 @@ import { NativeStackScreenProps } from '@react-navigation/native-stack';
 import React, { useCallback, useContext, useEffect, useRef, useState } from 'react';
 import {
   ActivityIndicator,
+  Alert,
   FlatList,
   InteractionManager,
   Keyboard,
@@ -14,6 +15,7 @@ import {
   Switch,
   Text,
   View,
+  findNodeHandle,
 } from 'react-native';
 import { Badge, Icon } from 'react-native-elements';
 import {
@@ -48,6 +50,7 @@ import { scanQrHelper } from '../../helpers/scan-qr';
 import usePrivacy from '../../hooks/usePrivacy';
 import loc from '../../loc';
 import { isDesktop } from '../../blue_modules/environment';
+import ActionSheet from '../ActionSheet';
 const fs = require('../../blue_modules/fs');
 const prompt = require('../../helpers/prompt');
 
@@ -57,7 +60,7 @@ const ViewEditMultisigCosigners = ({ route }: Props) => {
   const hasLoaded = useRef(false);
   const { colors } = useTheme();
   const { wallets, setWalletsWithNewOrder, isElectrumDisabled, isAdvancedModeEnabled } = useContext(BlueStorageContext);
-  const { navigate, goBack } = useNavigation();
+  const { navigate, goBack, dispatch, addListener } = useNavigation();
   const openScannerButtonRef = useRef();
   const { walletId } = route.params;
   const w = useRef(wallets.find((wallet: AbstractWallet) => wallet.getID() === walletId));
@@ -77,6 +80,11 @@ const ViewEditMultisigCosigners = ({ route }: Props) => {
   const [askPassphrase, setAskPassphrase] = useState(false);
   const [isAdvancedModeEnabledRender, setIsAdvancedModeEnabledRender] = useState(false);
   const data = useRef<any[]>();
+  /* discardChangesRef is only so the action sheet can be shown on mac catalyst when a 
+    user tries to leave the screen with unsaved changes.
+    Why the container view ? It was the easiest to get the ref for. No other reason.
+  */
+  const discardChangesRef = useRef<View>(null);
   const { enableBlur, disableBlur } = usePrivacy();
 
   const stylesHook = StyleSheet.create({
@@ -109,6 +117,53 @@ const ViewEditMultisigCosigners = ({ route }: Props) => {
       color: colors.buttonTextColor,
     },
   });
+  useFocusEffect(
+    useCallback(() => {
+      const unsubscribe = addListener('beforeRemove', e => {
+        // Check if there are unsaved changes
+        if (isSaveButtonDisabled) {
+          // If there are no unsaved changes, let the user leave the screen
+          return;
+        }
+
+        // Prevent the default action (going back)
+        e.preventDefault();
+
+        // Show an alert asking the user to discard changes or cancel
+        if (isDesktop) {
+          if (!discardChangesRef.current) return dispatch(e.data.action);
+          const anchor = findNodeHandle(discardChangesRef.current);
+          if (!anchor) return dispatch(e.data.action);
+          ActionSheet.showActionSheetWithOptions(
+            {
+              options: [loc._.cancel, loc._.ok],
+              cancelButtonIndex: 0,
+              title: loc._.discard_changes,
+              message: loc._.discard_changes_explain,
+              anchor,
+            },
+            buttonIndex => {
+              if (buttonIndex === 1) {
+                dispatch(e.data.action);
+              }
+            },
+          );
+        } else {
+          Alert.alert(loc._.discard_changes, loc._.discard_changes_explain, [
+            { text: loc._.cancel, style: 'cancel', onPress: () => {} },
+            {
+              text: loc._.ok,
+              style: 'default',
+              // If the user confirms, then we dispatch the action we blocked earlier
+              onPress: () => dispatch(e.data.action),
+            },
+          ]);
+        }
+      });
+
+      return unsubscribe;
+    }, [isSaveButtonDisabled, addListener, dispatch]),
+  );
 
   useEffect(() => {
     isAdvancedModeEnabled().then(setIsAdvancedModeEnabledRender);
@@ -576,7 +631,7 @@ const ViewEditMultisigCosigners = ({ route }: Props) => {
   const isPad: boolean = Platform.isPad;
 
   return (
-    <View style={[styles.root, stylesHook.root]}>
+    <View style={[styles.root, stylesHook.root]} ref={discardChangesRef}>
       <KeyboardAvoidingView
         enabled={!isPad}
         behavior={Platform.OS === 'ios' ? 'padding' : undefined}