1 files changed, 105 insertions, 0 deletions
diff --git a/client/src/router/Router.scala b/client/src/router/Router.scala
new file mode 100644
index 0000000..60e5ef2
--- /dev/null
+++ b/client/src/router/Router.scala
@@ -0,0 +1,105 @@
+package yoga.router
+
+import scala.scalajs.js
+import scala.scalajs.js.URIUtils
+import scala.xml.Node
+import java.net.URI
+
+import mhtml.Var
+import org.scalajs.dom.raw.{ Element, Node => RawNode }
+import org.scalajs.dom.{ document, window, Event, MouseEvent }
+
+import yoga.model.Route
+import yoga.view.index.Index
+import yoga.view.licence.LicencePage
+import yoga.view.notFound.NotFound
+
+object Router {
+
+  private val route: Var[Route] = Var(parseRoute(Path.current()))
+
+  def render(): Node =
+    <div
+      mhtml-onmount={ (n: RawNode) =>
+        document.addEventListener("click", Handler.click)
+        window.addEventListener("popstate", Handler.popState)
+      }
+      mhtml-onumnount={ (n: RawNode) =>
+        document.removeEventListener("click", Handler.click)
+        window.removeEventListener("popstate", Handler.popState)
+      }
+    >
+      {route.map {
+        case Route.Index => Index()
+        case Route.Licence(uri) => LicencePage(uri)
+        case Route.NotFound => NotFound()
+      }}
+    </div>
+
+  object Path {
+
+    val index: String = "/"
+
+    def licence(uri: URI): String = s"/licence/${uri}"
+
+    def current(): String =
+      URIUtils.decodeURI(s"${window.location.pathname}${window.location.search}")
+
+  }
+
+  private def parseRoute(path: String): Route =
+    pathAndParams(path) match {
+      case (List(), _) => Route.Index
+      case (List("licence", uri), _) => Route.Licence(URI.create(uri))
+      case _ => Route.NotFound
+    }
+
+  private def pathAndParams(path: String): (List[String], List[String]) = {
+    println(path)
+    def splitPath(path: String) = path.split("/").drop(1).toList
+    path.split('?') match {
+      case Array(path) => (splitPath(path), Nil)
+      case Array(path, params) => (splitPath(path), params.split("&").toList)
+    }
+  }
+
+  private object Handler {
+
+    lazy val click: js.Function1[MouseEvent, Unit] =
+      routeTransitionOnAnchorClick { path =>
+        route := parseRoute(path)
+        window.history.pushState(null, "", path)
+      }
+
+    lazy val popState: js.Function1[Event, Unit] =
+      _ => route := parseRoute(Path.current())
+
+  }
+
+  private def routeTransitionOnAnchorClick(goTo: String => Unit)(event: MouseEvent): Unit =
+    if (event.button == 0)
+      Dom.findSelfOrParent("a", event.target.asInstanceOf[RawNode]) match {
+        case Some(node) =>
+          val elem = node.asInstanceOf[Element]
+          if (elem.getAttribute("data-nav") != "ignore") {
+            event.preventDefault()
+            val href = elem.getAttribute("href")
+            if (href != Path.current()) goTo(href)
+          }
+        case _ =>
+      }
+
+  private object Dom {
+
+    @annotation.tailrec
+    def findSelfOrParent(nodeName: String, current: RawNode): Option[RawNode] =
+      if (current.nodeName.toString.toLowerCase == nodeName.toLowerCase)
+        Some(current)
+      else if (current.parentNode == null)
+        None
+      else
+        findSelfOrParent(nodeName, current.parentNode)
+
+  }
+
+}