zrequire('keydown_util');
zrequire('components');

const noop = function () {};

const LEFT_KEY = { which: 37, preventDefault: noop, stopPropagation: noop };
const RIGHT_KEY = { which: 39, preventDefault: noop, stopPropagation: noop };

run_test('basics', () => {
    let keydown_f;
    let click_f;
    const tabs = [];
    let focused_tab;
    let callback_args;

    function make_tab(i) {
        const self = {};

        assert.equal(tabs.length, i);

        self.stub = true;
        self.class = [];

        self.addClass = function (c) {
            self.class += ' ' + c;
            const tokens = self.class.trim().split(/ +/);
            self.class = _.uniq(tokens).join(' ');
        };

        self.removeClass = function (c) {
            const tokens = self.class.trim().split(/ +/);
            self.class = _.without(tokens, c).join(' ');
        };

        self.hasClass = function (c) {
            const tokens = self.class.trim().split(/ +/);
            return tokens.includes(c);
        };

        self.data = function (name) {
            assert.equal(name, 'tab-id');
            return i;
        };

        self.focus = function () {
            focused_tab = i;
        };

        tabs.push(self);

        return self;
    }

    const ind_tab = (function () {
        const self = {};

        self.stub = true;

        self.click = function (f) {
            click_f = f;
        };

        self.keydown = function (f) {
            keydown_f = f;
        };

        self.removeClass = function (c) {
            for (const tab of tabs) {
                tab.removeClass(c);
            }
        };

        self.eq = function (idx) {
            return tabs[idx];
        };

        return self;
    }());

    const switcher = (function () {
        const self = {};

        self.stub = true;

        self.children = [];

        self.classList = new Set();

        self.append = function (child) {
            self.children.push(child);
        };

        self.addClass = function (c) {
            self.classList.add(c);
            self.addedClass = c;
        };

        self.find = function (sel) {
            switch (sel) {
            case ".ind-tab":
                return ind_tab;
            default:
                throw Error('unknown selector: ' + sel);
            }
        };

        return self;
    }());

    set_global('$', function (sel) {
        if (sel.stub) {
            // The component often redundantly re-wraps objects.
            return sel;
        }

        switch (sel) {
        case "<div class='tab-switcher'></div>":
            return switcher;
        case "<div class='tab-switcher stream_sorter_toggle'></div>":
            return switcher;
        case "<div class='ind-tab' data-tab-key='keyboard-shortcuts' data-tab-id='0' tabindex='0'>translated: Keyboard shortcuts</div>":
            return make_tab(0);
        case "<div class='ind-tab' data-tab-key='message-formatting' data-tab-id='1' tabindex='0'>translated: Message formatting</div>":
            return make_tab(1);
        case "<div class='ind-tab' data-tab-key='search-operators' data-tab-id='2' tabindex='0'>translated: Search operators</div>":
            return make_tab(2);
        default:
            throw Error('unknown selector: ' + sel);
        }
    });

    let callback_value;

    let widget = null;
    widget = components.toggle({
        selected: 0,
        values: [
            { label: i18n.t("Keyboard shortcuts"), key: "keyboard-shortcuts" },
            { label: i18n.t("Message formatting"), key: "message-formatting" },
            { label: i18n.t("Search operators"), key: "search-operators" },
        ],
        html_class: "stream_sorter_toggle",
        callback: function (name, key) {
            assert.equal(callback_args, undefined);
            callback_args = [name, key];

            // The subs code tries to get a widget value in the middle of a
            // callback, which can lead to obscure bugs.
            if (widget) {
                callback_value = widget.value();
            }
        },
    });

    assert.equal(widget.get(), switcher);

    assert.deepEqual(switcher.children, tabs);

    assert.equal(switcher.addedClass, 'stream_sorter_toggle');

    assert.equal(focused_tab, 0);
    assert.equal(tabs[0].class, 'first selected');
    assert.equal(tabs[1].class, 'middle');
    assert.equal(tabs[2].class, 'last');
    assert.deepEqual(callback_args, ['translated: Keyboard shortcuts', 'keyboard-shortcuts']);
    assert.equal(widget.value(), 'translated: Keyboard shortcuts');

    callback_args = undefined;

    widget.goto('message-formatting');
    assert.equal(focused_tab, 1);
    assert.equal(tabs[0].class, 'first');
    assert.equal(tabs[1].class, 'middle selected');
    assert.equal(tabs[2].class, 'last');
    assert.deepEqual(callback_args, ['translated: Message formatting', 'message-formatting']);
    assert.equal(widget.value(), 'translated: Message formatting');

    // Go to same tab twice and make sure we get callback.
    callback_args = undefined;
    widget.goto('message-formatting');
    assert.deepEqual(callback_args, ['translated: Message formatting', 'message-formatting']);

    callback_args = undefined;
    keydown_f.call(tabs[focused_tab], RIGHT_KEY);
    assert.equal(focused_tab, 2);
    assert.equal(tabs[0].class, 'first');
    assert.equal(tabs[1].class, 'middle');
    assert.equal(tabs[2].class, 'last selected');
    assert.deepEqual(callback_args, ['translated: Search operators', 'search-operators']);
    assert.equal(widget.value(), 'translated: Search operators');
    assert.equal(widget.value(), callback_value);

    // try to crash the key handler
    keydown_f.call(tabs[focused_tab], RIGHT_KEY);
    assert.equal(widget.value(), 'translated: Search operators');

    callback_args = undefined;

    keydown_f.call(tabs[focused_tab], LEFT_KEY);
    assert.equal(widget.value(), 'translated: Message formatting');

    callback_args = undefined;

    keydown_f.call(tabs[focused_tab], LEFT_KEY);
    assert.equal(widget.value(), 'translated: Keyboard shortcuts');

    // try to crash the key handler
    keydown_f.call(tabs[focused_tab], LEFT_KEY);
    assert.equal(widget.value(), 'translated: Keyboard shortcuts');

    callback_args = undefined;

    click_f.call(tabs[1]);
    assert.equal(widget.value(), 'translated: Message formatting');

    callback_args = undefined;
    widget.disable_tab("search-operators");
    assert.equal(tabs[2].hasClass('disabled'), true);
    assert.equal(tabs[2].class, "last disabled");

    widget.goto('keyboard-shortcuts');
    assert.equal(focused_tab, 0);
    widget.goto("search-operators");
    assert.equal(focused_tab, 0);
});