const view = new lsp.EditorView({
    extensions: lsp.baseExts,
    parent: document.getElementById("editor")
});
let doc = "xquery version '3.1';\n(:~ comment:)\nmodule namespace pdfbox='ns';\n";
var client;
var extLint;
var workspace = {
    "file:///some/file.xqm": null
};

function $(id) { return document.getElementById(id) };

// Load saved content from localStorage when the page loads
window.addEventListener('load', () => {
    const savedText = localStorage.getItem('code');
    if (savedText) doc = savedText;
    let svr = localStorage.getItem('lsp');
    if (!svr) {
        let x = new URL(window.location.href);
        x.protocol = "ws";
        x.pathname = "ws/lsp"
        svr = x.href;
    }
    $("iServer").value = svr;
    formFromStore('fSettings');
    view.setState(lsp.EditorState.create({ doc: doc, extensions: lsp.baseExts }));
    lsp.updateCompartment(objectFromForm('fSettings'))
    connect();
});

// Save content to localStorage when the page is about to unload
window.addEventListener('beforeunload', () => {
    const doc = view.state.doc.toString();
    localStorage.setItem('code', doc);
    localStorage.setItem('lsp', $("iServer").value);
});

$("connect").onclick = e => { e.preventDefault(); connect() };

$("search").onclick = e => lsp.openSearchPanel(view);

$("fullscreen").onclick = e => $("editor").requestFullscreen();


$("bnWordAt").onclick = e => {
    let pos = view.state.selection.main.head;
    let w = view.state.wordAt(pos);
    alert("wordAt " + JSON.stringify(w));
};

$("symbols2").onclick = e => {
    client.sync();
    client.request("textDocument/documentSymbol", { "textDocument": { "uri": $("iFile").value } })
        .then(r => {
            console.log("symbols", r)
            $("symPanel").open = true;

            $("symList").setData(r);
        });
};

$("cmdList").onclick = e => {
    let cmds = lsp.listCommands(view);
    let result = "";
    [...cmds.keys()].sort().forEach(key => {
        result += `<li>${key} ${cmds.get(key).key}</li>`
    });
    $("popHelpInfo").innerHTML = `<ul>${result}</ul>`
    $("popCmds").showPopover()

};

$("symList").addEventListener("itemSelected", e => {
    const sel = e.detail.selectionRange;
    console.log("SYM selection range", sel);
    const an = 17 * e.detail.kind
    view.dispatch({ selection: { anchor: an, head: an + 34 }, scrollIntoView: true });
});

$("lint").onclick = async e => {
    console.log("word", view.state.wordAt(1));
    lsp.openLintPanel(view);
};

$("sync").onclick = e => { client.sync(); console.log("XXXsync"); };
// state a state
$("bnSave").onclick = e => { workspace[iFile] = view.state; };
$("bnLoad").onclick = e => { const v = workspace[iFile]; if (v) view.setState(v) };

// select local file
$("bnRead").onclick = e => { $("fileElem").click(); };
$("fileElem").onchange = e => {
    let fr = new FileReader();
    fr.onload = function () {
        alert(fr.result);
    }
    fr.readAsText(e.target.files[0]);
};

$("format").onclick = e => { console.log("FMT", lsp.formatDocument(view)); };

$("load").onchange = e => {
    const url = e.target.value;
    if (url.length == 0) return
    fetch(url)
        .then(response => response.text())
        .then(t => {
            view.dispatch({

                changes: {
                    from: 0,
                    to: view.state.doc.length,
                    insert: t
                }
            })
            //client.sync();
            //console.log("SYNC");
        });
    $("load").value = "";
};
$("tConnect").addEventListener('quiet-change', e => {
    e.preventDefault();
    $("popConnect").showPopover()
  });
$("msgIcon").onclick = e => {
    e.preventDefault();
    alert("NOT YET")
};


function updateSettings(event) {
    event.preventDefault();

    console.log("COPTS", lsp.curOpts);
    const opts = {
        lineWrap: $("lineWrap").checked,
        highlightWhitespace: $("highlightWhitespace").checked,
        minimap: $("minimap").checked
    }
    console.log(opts)
    lsp.updateCompartment(opts);
    $('popSettings').hidePopover();
    formToStore("fSettings");
};

$("fSettings").addEventListener("submit", updateSettings);

function connect() {
    const server = $("iServer").value;
    const file = $("iFile").value;
    lsp.simpleWebSocketTransport(server)
        .then(transport => {
            transport.socket.onclose = (event) => $("tConnect").checked=false;
            transport.socket.oneror = (event) => $("msg").innerText = "sock error!";
            transport.subscribe(incoming);
            client = new lsp.LSPClient({ extensions: lsp.languageServerExtensions() });
            client.connect(transport);
            $("popConnect").hidePopover();
            $("tConnect").checked=true;
            let extLsp = client.plugin(file, "xquery");

            view.dispatch({
                effects: lsp.StateEffect.appendConfig.of(
                    [lsp.linter(null, { autoPanel: true }), ...extLsp,
                    lsp.keymap.of([...lsp.formatKeymap])])
            })
        })
        .catch(e => {
            console.log(e);
             $("tConnect").checked=false;
            alert("connection failed: " + server)
        });

};



function incoming(msg) {
    const rpc = JSON.parse(msg);
    log(rpc);
};


function log(rpc) {
    console.log("<-", rpc)
    if (rpc.id) return;
    const when = (new Date()).toISOString();
    const msg = { name: rpc.method, detail: when.substring(1 + when.indexOf("T")), kind: 23 /* event */ };
    //name,details,kind
    $("msgList").setData([msg], true)
};

function formFromStore(name) {
    let v = localStorage.getItem(name)
    if (!!v) formDeserialize($(name), v);
};

function formToStore(name) {
    localStorage.setItem(name, formSerialize($(name)));
};

function objectFromForm(name) {
    const data = new FormData($(name));
    //https://stackabuse.com/convert-form-data-to-javascript-object/
    return Object.fromEntries(data.entries());
}
function formSerialize(form) {
    const data = new FormData(form);
    //https://stackoverflow.com/a/44033425/1869660
    return new URLSearchParams(data).toString();
}

function formDeserialize(form, data) {
    const entries = (new URLSearchParams(data)).entries();
    for (const [key, val] of entries) {
        //http://javascript-coder.com/javascript-form/javascript-form-value.phtml
        const input = form.elements[key];
        switch (input.type) {
            case 'checkbox': input.checked = !!val; break;
            default: input.value = val; break;
        }
    }
}