feat(Duolingo): Add Skip energy recharge ads patch (#6167)

patches/src/main/kotlin/app/revanced/patches/duolingo/energy/Fingerprints.kt

@@ -0,0 +1,21 @@
+package app.revanced.patches.duolingo.energy
+
+import app.revanced.patcher.fingerprint
+import com.android.tools.smali.dexlib2.AccessFlags
+import com.android.tools.smali.dexlib2.Opcode
+
+/**
+ * Matches the class found in [energyConfigToStringFingerprint].
+ */
+internal val initializeEnergyConfigFingerprint = fingerprint {
+    accessFlags(AccessFlags.PUBLIC, AccessFlags.CONSTRUCTOR)
+    opcodes(Opcode.RETURN_VOID)
+}
+
+// Class name currently is not obfuscated but it may be in the future.
+internal val energyConfigToStringFingerprint = fingerprint {
+    parameters()
+    returns("Ljava/lang/String;")
+    strings("EnergyConfig(", "maxEnergy=") // Partial string matches.
+    custom { method, _ -> method.name == "toString" }
+}

patches/src/main/kotlin/app/revanced/patches/duolingo/energy/SkipEnergyRechargeAdsPatch.kt

@@ -0,0 +1,31 @@
+package app.revanced.patches.duolingo.energy
+
+import app.revanced.patcher.extensions.InstructionExtensions.addInstructions
+import app.revanced.patcher.patch.bytecodePatch
+import app.revanced.util.findFieldFromToString
+
+@Suppress("unused")
+val skipEnergyRechargeAdsPatch = bytecodePatch(
+    name = "Skip energy recharge ads",
+    description = "Skips watching ads to recharge energy."
+) {
+    compatibleWith("com.duolingo")
+
+    execute {
+        initializeEnergyConfigFingerprint
+            .match(energyConfigToStringFingerprint.classDef)
+            .method.apply {
+                val energyField = energyConfigToStringFingerprint.method
+                    .findFieldFromToString("energy=")
+                val insertIndex = initializeEnergyConfigFingerprint.patternMatch!!.startIndex
+
+                addInstructions(
+                    insertIndex,
+                    """
+                        const/16 v0, 99
+                        iput v0, p0, $energyField
+                    """
+                )
+            }
+    }
+}