"use strict";

const {strict: assert} = require("assert");

const {$t} = require("./lib/i18n");
const {mock_jquery, zrequire} = require("./lib/namespace");
const {run_test, noop} = require("./lib/test");
const blueslip = require("./lib/zblueslip");

let env;

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

    assert.equal(env.tabs.length, i);

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

    $self.addClass = (c) => {
        $self.class += " " + c;
        const tokens = $self.class.trim().split(/ +/);
        $self.class = [...new Set(tokens)].join(" ");
    };

    $self.removeClass = (c) => {
        const tokens = $self.class.trim().split(/ +/);
        $self.class = tokens.filter((token) => token !== c).join(" ");
    };

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

    $self.attr = (name) => {
        assert.equal(name, "data-tab-id");
        return i;
    };

    $self.text = (text) => {
        assert.equal(
            text,
            [
                "translated: Keyboard shortcuts",
                "translated: Message formatting",
                "translated: Search filters",
            ][i],
        );
    };

    $self.trigger = (type) => {
        if (type === "focus") {
            env.focused_tab = i;
        }
    };

    env.tabs.push($self);

    return $self;
}

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

    $self.stub = true;

    $self.on = (name, f) => {
        if (name === "click") {
            env.click_f = f;
        } else if (name === "keydown") {
            env.keydown_f = f;
        }
    };

    $self.off = (name) => {
        if (name === "click") {
            env.click_f = undefined;
        }
    };

    $self.removeClass = (c) => {
        for (const $tab of env.tabs) {
            $tab.removeClass(c);
        }
    };

    $self.eq = (idx) => env.tabs[idx];

    return $self;
})();

function make_switcher() {
    const $self = {};

    $self.stub = true;

    $self.children = [];

    $self.classList = new Set();

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

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

    $self.find = (sel) => {
        switch (sel) {
            case ".ind-tab":
                return ind_tab;
            /* istanbul ignore next */
            default:
                throw new Error("unknown selector: " + sel);
        }
    };

    return $self;
}

mock_jquery((sel) => {
    if (sel.stub) {
        // The component often redundantly re-wraps objects.
        return sel;
    }

    switch (sel) {
        case "<div>":
            return {
                addClass(className) {
                    if (className === "tab-switcher") {
                        return env.switcher;
                    }

                    assert.equal(className, "ind-tab");
                    return {
                        attr(attributes) {
                            const tab_id = attributes["data-tab-id"];
                            assert.deepEqual(
                                attributes,
                                [
                                    {
                                        "data-tab-key": "keyboard-shortcuts",
                                        "data-tab-id": 0,
                                        tabindex: 0,
                                    },
                                    {
                                        "data-tab-key": "message-formatting",
                                        "data-tab-id": 1,
                                        tabindex: 0,
                                    },
                                    {
                                        "data-tab-key": "search-operators",
                                        "data-tab-id": 2,
                                        tabindex: 0,
                                    },
                                ][tab_id],
                            );
                            return make_tab(tab_id);
                        },
                    };
                },
            };
        /* istanbul ignore next */
        default:
            throw new Error("unknown selector: " + sel);
    }
});

const components = zrequire("components");

const LEFT_KEY = {key: "ArrowLeft", preventDefault: noop, stopPropagation: noop};
const RIGHT_KEY = {key: "ArrowRight", preventDefault: noop, stopPropagation: noop};

run_test("basics", () => {
    env = {
        keydown_f: undefined,
        click_f: undefined,
        tabs: [],
        focused_tab: undefined,
        switcher: make_switcher(),
    };

    let callback_args;
    let callback_value;

    let widget = null;
    widget = components.toggle({
        selected: 0,
        values: [
            {label: $t({defaultMessage: "Keyboard shortcuts"}), key: "keyboard-shortcuts"},
            {label: $t({defaultMessage: "Message formatting"}), key: "message-formatting"},
            {label: $t({defaultMessage: "Search filters"}), key: "search-operators"},
        ],
        html_class: "stream_sorter_toggle",
        callback(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(), env.switcher);

    assert.deepEqual(env.switcher.children, env.tabs);

    assert.equal(env.switcher.addedClass, "stream_sorter_toggle");

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

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

    callback_args = undefined;

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

    callback_args = undefined;

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

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

    callback_args = undefined;
    widget.disable_tab("message-formatting");

    env.keydown_f.call(env.tabs[env.focused_tab], RIGHT_KEY);
    assert.equal(widget.value(), "translated: Search filters");

    callback_args = undefined;

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

    widget.enable_tab("message-formatting");

    callback_args = undefined;

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

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

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

    blueslip.expect("warn", "Incorrect tab name given.", 3);
    widget.disable_tab("incorrect-tab");
    widget.enable_tab("incorrect-tab");
    widget.goto("incorrect-tab");
});