"use strict";

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

const _ = require("lodash");
const MockDate = require("mockdate");

const {set_global, zrequire} = require("./lib/namespace");
const {run_test} = require("./lib/test");

const blueslip = zrequire("blueslip");

set_global("document", {});
const util = zrequire("util");

run_test("CachedValue", () => {
    let x = 5;

    const cv = new util.CachedValue({
        compute_value() {
            return x * 2;
        },
    });

    assert.equal(cv.get(), 10);

    x = 6;
    assert.equal(cv.get(), 10);
    cv.reset();
    assert.equal(cv.get(), 12);
});

run_test("extract_pm_recipients", () => {
    assert.equal(util.extract_pm_recipients("bob@foo.com, alice@foo.com").length, 2);
    assert.equal(util.extract_pm_recipients("bob@foo.com, ").length, 1);
});

run_test("lower_bound", () => {
    const arr = [{x: 10}, {x: 20}, {x: 30}, {x: 40}, {x: 50}];

    function compare(a, b) {
        return a.x < b;
    }

    assert.equal(util.lower_bound(arr, 5, compare), 0);
    assert.equal(util.lower_bound(arr, 10, compare), 0);
    assert.equal(util.lower_bound(arr, 15, compare), 1);
    assert.equal(util.lower_bound(arr, 50, compare), 4);
    assert.equal(util.lower_bound(arr, 55, compare), 5);
});

run_test("lower_same", () => {
    assert.ok(util.lower_same("abc", "AbC"));
    assert.ok(!util.lower_same("abbc", "AbC"));

    blueslip.expect("error", "Cannot compare strings; at least one value is undefined");
    util.lower_same("abc", undefined);
});

run_test("same_recipient", () => {
    assert.ok(
        util.same_recipient(
            {type: "stream", stream_id: 101, topic: "Bar"},
            {type: "stream", stream_id: 101, topic: "bar"},
        ),
    );

    assert.ok(
        !util.same_recipient(
            {type: "stream", stream_id: 101, topic: "Bar"},
            {type: "stream", stream_id: 102, topic: "whatever"},
        ),
    );

    assert.ok(
        util.same_recipient(
            {type: "private", to_user_ids: "101,102"},
            {type: "private", to_user_ids: "101,102"},
        ),
    );

    assert.ok(
        !util.same_recipient(
            {type: "private", to_user_ids: "101,102"},
            {type: "private", to_user_ids: "103"},
        ),
    );

    assert.ok(
        !util.same_recipient({type: "stream", stream_id: 101, topic: "Bar"}, {type: "private"}),
    );

    assert.ok(!util.same_recipient({type: "private", to_user_ids: undefined}, {type: "private"}));

    assert.ok(!util.same_recipient(undefined, {type: "private"}));

    assert.ok(!util.same_recipient(undefined, undefined));
});

run_test("robust_url_decode", ({override}) => {
    assert.equal(util.robust_url_decode("xxx%3Ayyy"), "xxx:yyy");
    assert.equal(util.robust_url_decode("xxx%3"), "xxx");

    override(global, "decodeURIComponent", () => {
        throw new Error("foo");
    });
    assert.throws(
        () => {
            util.robust_url_decode("%E0%A4%A");
        },
        {name: "Error", message: "foo"},
    );
});

run_test("dumb_strcmp", ({override}) => {
    override(Intl, "Collator", undefined);
    const strcmp = util.make_strcmp();
    assert.equal(strcmp("a", "b"), -1);
    assert.equal(strcmp("c", "c"), 0);
    assert.equal(strcmp("z", "y"), 1);
});

run_test("get_edit_event_orig_topic", () => {
    assert.equal(util.get_edit_event_orig_topic({orig_subject: "lunch"}), "lunch");
});

run_test("is_mobile", () => {
    window.navigator = {userAgent: "Android"};
    assert.ok(util.is_mobile());

    window.navigator = {userAgent: "Not mobile"};
    assert.ok(!util.is_mobile());
});

run_test("array_compare", () => {
    assert.ok(util.array_compare([], []));
    assert.ok(util.array_compare([1, 2, 3], [1, 2, 3]));
    assert.ok(!util.array_compare([1, 2], [1, 2, 3]));
    assert.ok(!util.array_compare([1, 2, 3], [1, 2]));
    assert.ok(!util.array_compare([1, 2, 3, 4], [1, 2, 3, 5]));
});

run_test("normalize_recipients", () => {
    assert.equal(
        util.normalize_recipients("ZOE@foo.com, bob@foo.com, alice@foo.com, AARON@foo.com "),
        "aaron@foo.com,alice@foo.com,bob@foo.com,zoe@foo.com",
    );
});

run_test("random_int", () => {
    const min = 0;
    const max = 100;

    _.times(500, () => {
        const val = util.random_int(min, max);
        assert.ok(min <= val);
        assert.ok(val <= max);
        assert.equal(val, Math.floor(val));
    });
});

run_test("wildcard_mentions_regexp", () => {
    const messages_with_all_mentions = [
        "@**all**",
        "some text before @**all** some text after",
        "@**all** some text after only",
        "some text before only @**all**",
    ];

    const messages_with_everyone_mentions = [
        "@**everyone**",
        '"@**everyone**"',
        "@**everyone**: Look at this!",
        "The <@**everyone**> channel",
        'I have to say "@**everyone**" to ding the bell',
        "some text before @**everyone** some text after",
        "@**everyone** some text after only",
        "some text before only @**everyone**",
    ];

    const messages_with_stream_mentions = [
        "@**stream**",
        "some text before @**stream** some text after",
        "@**stream** some text after only",
        "some text before only @**stream**",
    ];

    const messages_with_channel_mentions = [
        "@**channel**",
        "some text before @**channel** some text after",
        "@**channel** some text after only",
        "some text before only @**channel**",
    ];

    const messages_with_topic_mentions = [
        "@**topic**",
        "some text before @**topic** some text after",
        "@**topic** some text after only",
        "some text before only @**topic**",
    ];

    const messages_without_all_mentions = [
        "@all",
        "some text before @all some text after",
        "`@everyone`",
        "some_email@everyone.com",
        "`@**everyone**`",
        "some_email@**everyone**.com",
    ];

    const messages_without_everyone_mentions = [
        "some text before @everyone some text after",
        "@everyone",
        "`@everyone`",
        "some_email@everyone.com",
        "`@**everyone**`",
        "some_email@**everyone**.com",
    ];

    const messages_without_stream_mentions = [
        "some text before @stream some text after",
        "@stream",
        "`@stream`",
        "some_email@stream.com",
        "`@**stream**`",
        "some_email@**stream**.com",
    ];

    const messages_without_channel_mentions = [
        "some text before @channel some text after",
        "@channel",
        "`@channel`",
        "some_email@channel.com",
        "`@**channel**`",
        "some_email@**channel**.com",
    ];

    let i;
    for (i = 0; i < messages_with_all_mentions.length; i += 1) {
        assert.ok(util.find_stream_wildcard_mentions(messages_with_all_mentions[i]));
    }

    for (i = 0; i < messages_with_everyone_mentions.length; i += 1) {
        assert.ok(util.find_stream_wildcard_mentions(messages_with_everyone_mentions[i]));
    }

    for (i = 0; i < messages_with_stream_mentions.length; i += 1) {
        assert.ok(util.find_stream_wildcard_mentions(messages_with_stream_mentions[i]));
    }

    for (i = 0; i < messages_with_channel_mentions.length; i += 1) {
        assert.ok(util.find_stream_wildcard_mentions(messages_with_channel_mentions[i]));
    }

    for (i = 0; i < messages_with_topic_mentions.length; i += 1) {
        assert.ok(!util.find_stream_wildcard_mentions(messages_with_topic_mentions[i]));
    }

    for (i = 0; i < messages_without_all_mentions.length; i += 1) {
        assert.ok(!util.find_stream_wildcard_mentions(messages_without_everyone_mentions[i]));
    }

    for (i = 0; i < messages_without_everyone_mentions.length; i += 1) {
        assert.ok(!util.find_stream_wildcard_mentions(messages_without_everyone_mentions[i]));
    }

    for (i = 0; i < messages_without_stream_mentions.length; i += 1) {
        assert.ok(!util.find_stream_wildcard_mentions(messages_without_stream_mentions[i]));
    }

    for (i = 0; i < messages_without_channel_mentions.length; i += 1) {
        assert.ok(!util.find_stream_wildcard_mentions(messages_without_channel_mentions[i]));
    }
});

run_test("move_array_elements_to_front", () => {
    const strings = ["string1", "string3", "string2", "string4"];
    const strings_selection = ["string4", "string1"];
    const strings_expected = ["string1", "string4", "string3", "string2"];
    const strings_no_selection = util.move_array_elements_to_front(strings, []);
    const strings_no_array = util.move_array_elements_to_front([], strings_selection);
    const strings_actual = util.move_array_elements_to_front(strings, strings_selection);
    const emails = [
        "test@zulip.com",
        "test@test.com",
        "test@localhost",
        "test@invalid@email",
        "something@zulip.com",
    ];
    const emails_selection = ["test@test.com", "test@localhost", "test@invalid@email"];
    const emails_expected = [
        "test@test.com",
        "test@localhost",
        "test@invalid@email",
        "test@zulip.com",
        "something@zulip.com",
    ];
    const emails_actual = util.move_array_elements_to_front(emails, emails_selection);
    assert.deepEqual(strings_no_selection, strings);
    assert.deepEqual(strings_no_array, []);
    assert.deepEqual(strings_actual, strings_expected);
    assert.deepEqual(emails_actual, emails_expected);
});

run_test("filter_by_word_prefix_match", () => {
    const strings = ["stream-hyphen_underscore/slash", "three word stream"];
    const values = [0, 1];
    const item_to_string = (idx) => strings[idx];

    // Default settings will match words with a space delimiter before them.
    assert.deepEqual(util.filter_by_word_prefix_match(values, "stream", item_to_string), [0, 1]);
    assert.deepEqual(util.filter_by_word_prefix_match(values, "word stream", item_to_string), [1]);

    // Since - appears before `hyphen` in
    // stream-hyphen_underscore/slash, we require `-` in the set of
    // characters for it to match.
    assert.deepEqual(util.filter_by_word_prefix_match(values, "hyphe", item_to_string), []);
    assert.deepEqual(util.filter_by_word_prefix_match(values, "hyphe", item_to_string, /[\s/_-]/), [
        0,
    ]);
    assert.deepEqual(util.filter_by_word_prefix_match(values, "hyphe", item_to_string, /[\s-]/), [
        0,
    ]);

    // Similarly `_` must be in the set of allowed characters to match "underscore".
    assert.deepEqual(util.filter_by_word_prefix_match(values, "unders", item_to_string, /[\s_]/), [
        0,
    ]);
    assert.deepEqual(util.filter_by_word_prefix_match(values, "unders", item_to_string, /\s/), []);
});

run_test("get_string_diff", () => {
    assert.deepEqual(
        util.get_string_diff("#ann is for updates", "#**announce** is for updates"),
        [1, 4, 13],
    );
    assert.deepEqual(util.get_string_diff("/p", "/poll"), [2, 2, 5]);
    assert.deepEqual(util.get_string_diff("Hey @Aa", "Hey @**aaron** "), [5, 7, 15]);
    assert.deepEqual(util.get_string_diff("same", "same"), [0, 0, 0]);
    assert.deepEqual(util.get_string_diff("same-end", "two same-end"), [0, 0, 4]);
    assert.deepEqual(util.get_string_diff("space", "sp ace"), [2, 2, 3]);
});

run_test("is_valid_url", () => {
    assert.equal(util.is_valid_url("http://"), false);
    assert.equal(util.is_valid_url("random_string"), true);
    assert.equal(util.is_valid_url("http://google.com/something?q=query#hash"), true);
    assert.equal(util.is_valid_url("/abc/"), true);

    assert.equal(util.is_valid_url("http://", true), false);
    assert.equal(util.is_valid_url("random_string", true), false);
    assert.equal(util.is_valid_url("http://google.com/something?q=query#hash", true), true);
    assert.equal(util.is_valid_url("/abc/", true), false);
});

run_test("format_array_as_list", () => {
    const array = ["apple", "banana", "orange"];
    // when Intl exist
    assert.equal(
        util.format_array_as_list(array, "long", "conjunction"),
        "apple, banana, and orange",
    );

    // when Intl.ListFormat does not exist
    global.Intl.ListFormat = undefined;
    assert.equal(util.format_array_as_list(array, "long", "conjunction"), "apple, banana, orange");
});

run_test("get_remaining_time", () => {
    // When current time is less than start time
    // Set a random start time
    const start_time = new Date(1000).getTime();
    // Set current time to 400ms ahead of the start time
    MockDate.set(start_time + 400);
    const duration = 500;
    let expected_remaining_time = 100;
    assert.equal(util.get_remaining_time(start_time, duration), expected_remaining_time);

    // When current time is greater than start time + duration
    // Set current time to 100ms after the start time + duration
    MockDate.set(start_time + duration + 100);
    expected_remaining_time = 0;
    assert.equal(util.get_remaining_time(start_time, duration), expected_remaining_time);

    MockDate.reset();
});

run_test("the", () => {
    const list_with_one_item = ["foo"];
    assert.equal(util.the(list_with_one_item), "foo");

    blueslip.expect("error", "the: expected only 1 item, got more");
    const list_with_more_items = ["foo", "bar"];
    // Error is thrown, but we still return the first item to avoid
    // unnecessarily breaking the app.
    assert.equal(util.the(list_with_more_items), "foo");

    blueslip.expect("error", "the: expected only 1 item, got none");
    // Error is thrown, but we still return the "first" item to avoid
    // unnecessarily breaking the app for places we refactored this that
    // were previously typed wrong but not breaking the app.
    assert.equal(util.the([]), undefined);
});