feat: patch options (#81)

* feat: Patch Options

* refactor: remove delegate property

* feat: List patch options

* refactor: add setter example to PatchOptionsUsage.kt

* docs: add docs for PatchOptions

* docs: tidy docs

src/main/kotlin/app/revanced/patcher/patch/Patch.kt

@@ -17,4 +17,9 @@ abstract class Patch<out T : Data> {
      * The main function of the [Patch] which the patcher will call.
      */
     abstract fun execute(data: @UnsafeVariance T): PatchResult
+
+    /**
+     * A list of [PatchOption]s.
+     */
+    open val options: Iterable<PatchOption<*>> = listOf()
 }

src/main/kotlin/app/revanced/patcher/patch/PatchOption.kt

@@ -0,0 +1,100 @@
+package app.revanced.patcher.patch
+
+/**
+ * A [Patch] option.
+ * @param key Unique identifier of the option. Example: _`settings.microg.enabled`_
+ * @param default The default value of the option.
+ * @param title A human-readable title of the option. Example: _MicroG Settings_
+ * @param description A human-readable description of the option. Example: _Settings integration for MicroG._
+ * @param required Whether the option is required.
+ */
+@Suppress("MemberVisibilityCanBePrivate")
+sealed class PatchOption<T>(
+    val key: String,
+    default: T?,
+    val title: String,
+    val description: String,
+    val required: Boolean
+) {
+    var value: T? = default
+
+    /**
+     * A [PatchOption] representing a [String].
+     * @see PatchOption
+     */
+    class StringOption(
+        key: String,
+        default: String?,
+        title: String,
+        description: String,
+        required: Boolean = false
+    ) : PatchOption<String>(
+        key, default, title, description, required
+    )
+
+    /**
+     * A [PatchOption] representing a [Boolean].
+     * @see PatchOption
+     */
+    class BooleanOption(
+        key: String,
+        default: Boolean?,
+        title: String,
+        description: String,
+        required: Boolean = false
+    ) : PatchOption<Boolean>(
+        key, default, title, description, required
+    )
+
+    /**
+     * A [PatchOption] with a list of allowed options.
+     * @param options A list of allowed options for the [ListOption].
+     * @see PatchOption
+     */
+    sealed class ListOption<E>(
+        key: String,
+        default: E?,
+        val options: Iterable<E>,
+        title: String,
+        description: String,
+        required: Boolean = false
+    ) : PatchOption<E>(
+        key, default, title, description, required
+    ) {
+        init {
+            if (default !in options) {
+                throw IllegalStateException("Default option must be an allowed options")
+            }
+        }
+    }
+
+    /**
+     * A [ListOption] of type [String].
+     * @see ListOption
+     */
+    class StringListOption(
+        key: String,
+        default: String?,
+        options: Iterable<String>,
+        title: String,
+        description: String,
+        required: Boolean = false
+    ) : ListOption<String>(
+        key, default, options, title, description, required
+    )
+
+    /**
+     * A [ListOption] of type [Int].
+     * @see ListOption
+     */
+    class IntListOption(
+        key: String,
+        default: Int?,
+        options: Iterable<Int>,
+        title: String,
+        description: String,
+        required: Boolean = false
+    ) : ListOption<Int>(
+        key, default, options, title, description, required
+    )
+}