Added LocalStorage

modules/harness-web-ui/src/main/scala/harness/webUI/LocalStorage.scala

@@ -0,0 +1,82 @@
+package harness.webUI
+
+import harness.core.*
+import harness.webUI.error.UIError
+import org.scalajs.dom.window.localStorage
+import zio.*
+import zio.json.*
+
+object LocalStorage {
+
+  object get {
+
+    // required
+
+    def apply(key: String): IO[UIError.Failure, String] =
+      LocalStorage.get.option(key).someOrFail(UIError.Failure.internalDefect(s"Missing localStorage key '$key'"))
+
+    def encoded[A: StringDecoder](key: String): IO[UIError.Failure, A] =
+      LocalStorage.get(key).flatMap { s => UIError.fromEither(StringDecoder[A].decode(s)) }
+
+    def json[A: JsonDecoder](key: String): IO[UIError.Failure, A] =
+      LocalStorage.get.encoded[A](key)(using StringDecoder.fromJsonDecoder[A])
+
+    // optional
+
+    object option {
+
+      def apply(key: String): IO[UIError.Failure, Option[String]] =
+        UIError.attempt { Option(localStorage.getItem(key)) }
+
+      def encoded[A: StringDecoder](key: String): IO[UIError.Failure, Option[A]] =
+        LocalStorage.get.option(key).flatMap { ZIO.foreach(_) { s => UIError.fromEither(StringDecoder[A].decode(s)) } }
+
+      def json[A: JsonDecoder](key: String): IO[UIError.Failure, Option[A]] =
+        LocalStorage.get.option.encoded[A](key)(using StringDecoder.fromJsonDecoder[A])
+
+    }
+
+  }
+
+  object set {
+
+    // required
+
+    def apply(key: String, value: String): IO[UIError.Failure, Unit] =
+      UIError.attempt { localStorage.setItem(key, value) }
+
+    def encoded[A: StringEncoder](key: String, value: A): IO[UIError.Failure, Unit] =
+      LocalStorage.set(key, StringEncoder[A].encode(value))
+
+    def json[A: JsonEncoder](key: String, value: A): IO[UIError.Failure, Unit] =
+      LocalStorage.set.encoded(key, value)(using StringEncoder.fromJsonEncoder[A])
+
+    // optional
+
+    /**
+      * Behavior:
+      *   Some(_) -> set
+      *   None    -> remove
+      */
+    object option {
+
+      def apply(key: String, value: Option[String]): IO[UIError.Failure, Unit] = value match
+        case Some(value) => LocalStorage.set(key, value)
+        case None        => LocalStorage.remove(key)
+
+      def encoded[A: StringEncoder](key: String, value: Option[A]): IO[UIError.Failure, Unit] = value match
+        case Some(value) => LocalStorage.set.encoded(key, value)
+        case None        => LocalStorage.remove(key)
+
+      def json[A: JsonEncoder](key: String, value: Option[A]): IO[UIError.Failure, Unit] = value match
+        case Some(value) => LocalStorage.set.json(key, value)
+        case None        => LocalStorage.remove(key)
+
+    }
+
+  }
+
+  def remove(key: String): IO[UIError.Failure, Unit] =
+    UIError.attempt { localStorage.removeItem(key) }
+
+}

modules/harness-web-ui/src/main/scala/harness/webUI/error/UIError.scala

@@ -5,6 +5,7 @@ import cats.syntax.option.*
 import harness.webUI.*
 import harness.zio.*
 import harness.zio.json.throwableJsonCodec
+import zio.*
 import zio.json.*
 
 sealed trait UIError
@@ -45,4 +46,10 @@ object UIError {
 
   }
 
+  def attempt[A](thunk: => A): IO[UIError.Failure, A] =
+    ZIO.attempt { thunk }.mapError(UIError.Failure.internalDefect)
+
+  def fromEither[A](either: => Either[String, A]): IO[UIError.Failure, A] =
+    ZIO.fromEither(either).mapError(UIError.Failure.internalDefect)
+
 }