From af6ceb01558af43e22c0f54ee3554b1cfd26ff7e Mon Sep 17 00:00:00 2001
From: kumulynja <b@kumuly.dev>
Date: Thu, 30 May 2024 19:36:07 +0200
Subject: [PATCH] add default config methods for Blockchain

---
 example/lib/bdk_library.dart   | 43 ++++++++++++++++++++--------------
 example/lib/simple_wallet.dart | 19 ++++++++++-----
 lib/src/root.dart              | 24 +++++++++++++++++++
 3 files changed, 63 insertions(+), 23 deletions(-)

diff --git a/example/lib/bdk_library.dart b/example/lib/bdk_library.dart
index dbe57859..89faa7b9 100644
--- a/example/lib/bdk_library.dart
+++ b/example/lib/bdk_library.dart
@@ -19,24 +19,33 @@ class BdkLibrary {
     return descriptor;
   }
 
-  Future<Blockchain> initializeBlockchain(bool isElectrumBlockchain) async {
-    if (isElectrumBlockchain) {
-      final blockchain = await Blockchain.create(
-          config: const BlockchainConfig.esplora(
-              config: EsploraConfig(
-                  baseUrl: 'https://blockstream.info/testnet/api',
-                  stopGap: 10)));
-      return blockchain;
+  Future<Blockchain> initializeBlockchain({
+    bool isElectrumBlockchain = false,
+    bool useTestnetDefaults = false,
+  }) async {
+    if (useTestnetDefaults) {
+      return await Blockchain.createWithTestnetDefaults();
+    } else if (isElectrumBlockchain) {
+      return await Blockchain.create(
+        config: const BlockchainConfig.electrum(
+          config: ElectrumConfig(
+            stopGap: 10,
+            timeout: 5,
+            retry: 5,
+            url: "ssl://electrum.blockstream.info:60002",
+            validateDomain: true,
+          ),
+        ),
+      );
     } else {
-      final blockchain = await Blockchain.create(
-          config: const BlockchainConfig.electrum(
-              config: ElectrumConfig(
-                  stopGap: 10,
-                  timeout: 5,
-                  retry: 5,
-                  url: "ssl://electrum.blockstream.info:60002",
-                  validateDomain: true)));
-      return blockchain;
+      return await Blockchain.create(
+        config: const BlockchainConfig.esplora(
+          config: EsploraConfig(
+            baseUrl: 'https://blockstream.info/testnet/api',
+            stopGap: 10,
+          ),
+        ),
+      );
     }
   }
 
diff --git a/example/lib/simple_wallet.dart b/example/lib/simple_wallet.dart
index 02f1d0fd..e26859f5 100644
--- a/example/lib/simple_wallet.dart
+++ b/example/lib/simple_wallet.dart
@@ -43,13 +43,20 @@ class _SimpleWalletState extends State<SimpleWallet> {
     });
   }
 
-  initBlockchain(bool isElectrumBlockchain) async {
-    blockchain = await lib.initializeBlockchain(isElectrumBlockchain);
+  initBlockchain({
+    bool isElectrumBlockchain = false,
+    bool useTestnetDefaults = false,
+  }) async {
+    blockchain = await lib.initializeBlockchain(
+      isElectrumBlockchain: isElectrumBlockchain,
+      useTestnetDefaults: useTestnetDefaults,
+    );
   }
 
   sync() async {
     if (blockchain == null) {
-      await initBlockchain(false);
+      // Initialize blockchain with default testnet values and esplora server
+      await initBlockchain(useTestnetDefaults: true);
     }
     await lib.sync(blockchain!, aliceWallet);
   }
@@ -57,9 +64,9 @@ class _SimpleWalletState extends State<SimpleWallet> {
   getNewAddress() async {
     final res = (await lib.getAddress(aliceWallet));
     debugPrint(await res.address.asString());
-    setState(() async {
-      displayText =
-          "Address: ${await res.address.asString()} \n Index: ${res.index}";
+    final address = await res.address.asString();
+    setState(() {
+      displayText = "Address: $address \n Index: ${res.index}";
     });
   }
 
diff --git a/lib/src/root.dart b/lib/src/root.dart
index 93e55c0a..10e20b12 100644
--- a/lib/src/root.dart
+++ b/lib/src/root.dart
@@ -61,6 +61,30 @@ class Blockchain extends BdkBlockchain {
     }
   }
 
+  static Future<Blockchain> createWithMutinynetDefaults({
+    int stopGap = 20,
+  }) async {
+    final config = BlockchainConfig.esplora(
+      config: EsploraConfig(
+        baseUrl: 'https://mutinynet.ltbl.io/api',
+        stopGap: stopGap,
+      ),
+    );
+    return create(config: config);
+  }
+
+  static Future<Blockchain> createWithTestnetDefaults({
+    int stopGap = 20,
+  }) async {
+    final config = BlockchainConfig.esplora(
+      config: EsploraConfig(
+        baseUrl: 'https://testnet.ltbl.io/api',
+        stopGap: stopGap,
+      ),
+    );
+    return create(config: config);
+  }
+
   ///Estimate the fee rate required to confirm a transaction in a given target of blocks
   @override
   Future<FeeRate> estimateFee({required int target, hint}) async {