<script>
    function filename(path) {
        url = new URL(path)
        return url.pathname.split('/').pop() + url.hash
    }

    (async () => {
    try {
        parent.postMessage(`Initial history length is ${navigation.entries().length}`, "*");

        navigation.oncurrententrychange = (e) => {
            parent.postMessage(`${e.type} for change to ${filename(navigation.currentEntry.url)} of type ${e.navigationType} from ${filename(e.from.url)}`, "*");
        }

        navigation.onnavigate = (e) => {
            parent.postMessage(`NavigateEvent for ${e.navigationType} ${filename(e.destination.url)} (Same document? ${e.destination.sameDocument}) with info: ${e.info}`, "*")
        }

        // Navigate to fragment
        let a = navigation.navigate("navigation-navigate-iframe.html#1", { info: 42, history: "push" });

        await a.committed.then((f) => {
           parent.postMessage(`Committed to navigation to ${filename(f.url)}`, "*");
        },
        (e) => {
            parent.postMessage("ERROR:" + e, "*", "*");
        })

        await a.finished.then((f) => {
           parent.postMessage(`Finished navigation to ${filename(f.url)}`, "*");
        },
        (e) => {
            parent.postMessage("ERROR:" + e, "*");
        })

        parent.postMessage(`History length after navigate is ${navigation.entries().length}`, "*");

        // FIXME: Enable these tests 😅
        // Navigate backwards
        // let b = navigation.back()
        // await b.committed.then((f) => {
        //    parent.postMessage(`Committed to back navigation to ${filename(f.url)}`, "*");
        // },
        // (e) => {
        //     parent.postMessage("ERROR:" + e, "*", "*");
        // })
        // await b.finished.then((f) => {
        //    parent.postMessage(`Finished back navigation to ${filename(f.url)}`, "*");
        // },
        // (e) => {
        //     parent.postMessage("ERROR:" + e, "*");
        // })

        // parent.postMessage(`History length after back is ${navigation.entries().length}`, "*");

        // Navigate forwards
        // let c = navigation.forward()
        // await c.committed.then((f) => {
        //    parent.postMessage(`Committed to forward navigation to ${filename(f.url)}`, "*");
        // },
        // (e) => {
        //     parent.postMessage("ERROR:" + e, "*", "*");
        // })
        // await c.finished.then((f) => {
        //    parent.postMessage(`Finished forward navigation to ${filename(f.url)}`, "*");
        // },
        // (e) => {
        //     parent.postMessage("ERROR:" + e, "*");
        // })

        // parent.postMessage(`History length after forward is ${navigation.entries().length}`, "*");

    } catch (e) {
        parent.postMessage("ERROR:" + e, "*");
    }
    parent.postMessage("DONE", "*");
    })();
</script>