"use strict";

const noteEditor = (function() {
    const noteTitleEl = $("#note-title");
    const noteDetailEl = $('#note-detail');
    const protectButton = $("#protect-button");
    const unprotectButton = $("#unprotect-button");
    const noteDetailWrapperEl = $("#note-detail-wrapper");

    let currentNote = null;

    let noteChangeDisabled = false;

    let isNoteChanged = false;

    function getCurrentNote() {
        return currentNote;
    }

    function getCurrentNoteId() {
        return currentNote ? currentNote.detail.note_id : null;
    }

    function getCurrentNoteLoadTime() {
        return currentNote ? currentNote.loadTime : null;
    }

    function noteChanged() {
        if (noteChangeDisabled) {
            return;
        }

        isNoteChanged = true;
    }

    async function reload() {
        // no saving here

        await loadNoteToEditor(getCurrentNoteId());
    }

    async function switchToNote(noteId) {
        if (getCurrentNoteId() !== noteId) {
            await saveNoteIfChanged();

            await loadNoteToEditor(noteId);
        }
    }

    async function saveNoteIfChanged() {
        if (!isNoteChanged) {
            return;
        }

        const note = noteEditor.getCurrentNote();

        updateNoteFromInputs(note);

        await saveNoteToServer(note);

        if (note.detail.is_protected) {
            protected_session.touchProtectedSession();
        }
    }

    function parseHtml(contents, note) {
        note.links = [];
        note.images = [];

        note.detail.note_text = contents;

        if (!note.detail.is_protected) {
            const linkRegexp = /<a[^>]+?href="[^"]*app#([A-Za-z0-9]{22})"[^>]*?>[^<]+?<\/a>/g;
            let match;

            while (match = linkRegexp.exec(contents)) {
                console.log("adding link for " + match[1]);

                note.links.push({
                    note_id: note.detail.note_id,
                    target_note_id: match[1]
                });
            }
        }
    }

    function updateNoteFromInputs(note) {
        const contents = noteDetailEl.summernote('code');

        parseHtml(contents, note);

        const title = noteTitleEl.val();

        note.detail.note_title = title;

        noteTree.setCurrentNoteTitle(title);
    }

    async function saveNoteToServer(note) {
        await $.ajax({
            url: baseApiUrl + 'notes/' + note.detail.note_id,
            type: 'PUT',
            data: JSON.stringify(note),
            contentType: "application/json",
            error: () => {
                showError("Error saving the note!");
            }
        });

        isNoteChanged = false;

        showMessage("Saved!");
    }

    function setNoteBackgroundIfProtected(note) {
        if (note.detail.is_protected) {
            $(".note-editable").addClass("protected");
            protectButton.hide();
            unprotectButton.show();
        }
        else {
            $(".note-editable").removeClass("protected");
            protectButton.show();
            unprotectButton.hide();
        }

        noteTree.setCurrentNoteTreeBasedOnProtectedStatus();
    }

    let isNewNoteCreated = false;

    function newNoteCreated() {
        isNewNoteCreated = true;
    }

    async function loadNoteToEditor(noteId) {
        currentNote = await $.get(baseApiUrl + 'notes/' + noteId);

        if (isNewNoteCreated) {
            isNewNoteCreated = false;

            noteTitleEl.focus().select();
        }

        await protected_session.ensureProtectedSession(currentNote.detail.is_protected, false);

        if (currentNote.detail.is_protected) {
            protected_session.touchProtectedSession();
        }

        // this might be important if we focused on protected note when not in protected note and we got a dialog
        // to login, but we chose instead to come to another node - at that point the dialog is still visible and this will close it.
        protected_session.ensureDialogIsClosed();

        noteDetailWrapperEl.show();

        noteTitleEl.val(currentNote.detail.note_title);

        noteChangeDisabled = true;

        // Clear contents and remove all stored history. This is to prevent undo from going across notes
        noteDetailEl.summernote('reset');

        noteDetailEl.summernote('code', currentNote.detail.note_text);

        noteChangeDisabled = false;

        setNoteBackgroundIfProtected(currentNote);

        showAppIfHidden();
    }

    async function loadNote(noteId) {
        return await $.get(baseApiUrl + 'notes/' + noteId);
    }

    $(document).ready(() => {
        noteTitleEl.on('input', () => {
            noteChanged();
        });

        noteDetailEl.summernote({
            airMode: true,
            height: 300,
            callbacks: {
                onChange: noteChanged
            }
        });

        // so that tab jumps from note title (which has tabindex 1)
        $(".note-editable").attr("tabindex", 2);
    });

    setInterval(saveNoteIfChanged, 5000);

    return {
        reload,
        switchToNote,
        saveNoteIfChanged,
        updateNoteFromInputs,
        saveNoteToServer,
        setNoteBackgroundIfProtected,
        loadNote,
        getCurrentNote,
        getCurrentNoteId,
        getCurrentNoteLoadTime,
        newNoteCreated
    };
})();