"use strict";

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

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

const user_topics = zrequire("user_topics");
const muted_users = zrequire("muted_users");
const {MessageListData} = zrequire("../src/message_list_data");
const {Filter} = zrequire("filter");

function make_msg(msg_id) {
    return {
        id: msg_id,
        type: "stream",
        unread: true,
        topic: "whatever",
    };
}

function make_msgs(msg_ids) {
    return msg_ids.map((msg_id) => make_msg(msg_id));
}

function assert_contents(mld, msg_ids) {
    const msgs = mld.all_messages();
    assert.deepEqual(msgs, make_msgs(msg_ids));
}

function assert_msg_ids(messages, msg_ids) {
    assert.deepEqual(
        msg_ids,
        messages.map((message) => message.id),
    );
}

run_test("basics", () => {
    const mld = new MessageListData({
        excludes_muted_topics: false,
    });

    assert.equal(mld.is_search(), false);
    assert.ok(mld.can_mark_messages_read());
    mld.add_anywhere(make_msgs([35, 25, 15, 45]));

    assert_contents(mld, [15, 25, 35, 45]);

    const new_msgs = make_msgs([10, 20, 30, 40, 50, 60, 70]);
    const info = mld.add_messages(new_msgs);

    assert.deepEqual(info, {
        top_messages: make_msgs([10]),
        interior_messages: make_msgs([20, 30, 40]),
        bottom_messages: make_msgs([50, 60, 70]),
    });

    assert_contents(mld, [10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70]);

    assert.equal(mld.selected_id(), -1);
    assert.equal(mld.closest_id(8), 10);
    assert.equal(mld.closest_id(27), 25);
    assert.equal(mld.closest_id(72), 70);

    mld.set_selected_id(50);
    assert.equal(mld.selected_id(), 50);
    assert.equal(mld.selected_idx(), 8);

    mld.remove([50]);
    assert_contents(mld, [10, 15, 20, 25, 30, 35, 40, 45, 60, 70]);

    mld.update_items_for_muting();
    assert_contents(mld, [10, 15, 20, 25, 30, 35, 40, 45, 60, 70]);

    mld.reset_select_to_closest();
    assert.equal(mld.selected_id(), 45);
    assert.equal(mld.selected_idx(), 7);

    assert.equal(mld.first_unread_message_id(), 10);
    assert.equal(mld.has_unread_messages(), true);
    mld.get(10).unread = false;
    assert.equal(mld.first_unread_message_id(), 15);
    assert.equal(mld.has_unread_messages(), true);

    mld.clear();
    assert_contents(mld, []);
    const msgs_sent_by_6 = [
        {id: 2, sender_id: 6, type: "stream", stream_id: 1, topic: "whatever"},
        {id: 4, sender_id: 6, type: "private", to_user_ids: "6,9,10"},
        {id: 6, sender_id: 6, type: "private", to_user_ids: "6, 11"},
    ];
    const msgs_with_sender_ids = [
        {id: 1, sender_id: 1, type: "stream", stream_id: 1, topic: "random1"},
        {id: 3, sender_id: 4, type: "stream", stream_id: 1, topic: "random2"},
        {id: 5, sender_id: 2, type: "private", to_user_ids: "2,10,11"},
        {id: 8, sender_id: 11, type: "private", to_user_ids: "10"},
        {id: 9, sender_id: 11, type: "private", to_user_ids: "9"},
        ...msgs_sent_by_6,
    ];
    mld.add_messages(msgs_with_sender_ids);
    assert.deepEqual(mld.get_messages_sent_by_user(6), msgs_sent_by_6);

    mld.clear();
    assert_contents(mld, []);
    assert.equal(mld.closest_id(99), -1);
    assert.equal(mld.get_last_message_sent_by_me(), undefined);

    mld.add_messages(make_msgs([120, 125.01, 130, 140]));
    assert_contents(mld, [120, 125.01, 130, 140]);
    mld.set_selected_id(125.01);
    assert.equal(mld.selected_id(), 125.01);

    mld.get(125.01).id = 145;
    mld.change_message_id(125.01, 145);
    assert_contents(mld, [120, 130, 140, 145]);

    for (const msg of mld.all_messages()) {
        msg.unread = false;
    }

    assert.equal(mld.first_unread_message_id(), 145);
    assert.equal(mld.has_unread_messages(), false);
});

run_test("muting", () => {
    let mld = new MessageListData({
        excludes_muted_topics: false,
        filter: new Filter([{operator: "dm", operand: "alice@example.com"}]),
    });

    const msgs = [
        {id: 1, type: "stream", stream_id: 1, topic: "muted"},
        {id: 2, type: "stream", stream_id: 1, topic: "whatever"},
        {id: 3, type: "stream", stream_id: 1, topic: "muted", mentioned: true}, // mentions override muting

        // 10 = muted user, 9 = non-muted user, 11 = you
        {id: 4, type: "private", to_user_ids: "9,10,11", sender_id: 10}, // muted to huddle
        {id: 5, type: "private", to_user_ids: "9,10,11", sender_id: 9}, // non-muted to huddle
        {id: 6, type: "private", to_user_ids: "11", sender_id: 10}, // muted to 1:1 PM
        {id: 7, type: "private", to_user_ids: "11", sender_id: 9}, // non-muted to 1:1 PM
        {id: 8, type: "private", to_user_ids: "10", sender_id: 11}, // 1:1 PM to muted
        {id: 9, type: "private", to_user_ids: "9", sender_id: 11}, // 1:1 PM to non-muted
    ];

    user_topics.update_user_topics(1, "muted", user_topics.all_visibility_policies.MUTED);
    muted_users.add_muted_user(10);

    // `messages_filtered_for_topic_mutes` should skip filtering
    // messages if `excludes_muted_topics` is false.
    assert.deepEqual(mld.messages_filtered_for_topic_mutes(msgs), msgs);

    // If we are in a 1:1 PM narrow, `messages_filtered_for_user_mutes` should skip
    // filtering messages.
    assert.deepEqual(mld.messages_filtered_for_user_mutes(msgs), msgs);

    // Test actual behaviour of `messages_filtered_for_*` methods.
    mld.excludes_muted_topics = true;
    mld.filter = new Filter([{operator: "stream", operand: "general"}]);
    const res = mld.messages_filtered_for_topic_mutes(msgs);
    assert.deepEqual(res, [
        {id: 2, type: "stream", stream_id: 1, topic: "whatever"},
        {id: 3, type: "stream", stream_id: 1, topic: "muted", mentioned: true}, // mentions override muting

        // `messages_filtered_for_topic_mutes` does not affect private messages
        {id: 4, type: "private", to_user_ids: "9,10,11", sender_id: 10},
        {id: 5, type: "private", to_user_ids: "9,10,11", sender_id: 9},
        {id: 6, type: "private", to_user_ids: "11", sender_id: 10},
        {id: 7, type: "private", to_user_ids: "11", sender_id: 9},
        {id: 8, type: "private", to_user_ids: "10", sender_id: 11},
        {id: 9, type: "private", to_user_ids: "9", sender_id: 11},
    ]);

    const res_user = mld.messages_filtered_for_user_mutes(msgs);
    assert.deepEqual(res_user, [
        // `messages_filtered_for_user_mutes` does not affect stream messages
        {id: 1, type: "stream", stream_id: 1, topic: "muted"},
        {id: 2, type: "stream", stream_id: 1, topic: "whatever"},
        {id: 3, type: "stream", stream_id: 1, topic: "muted", mentioned: true},

        {id: 4, type: "private", to_user_ids: "9,10,11", sender_id: 10}, // muted to huddle
        {id: 5, type: "private", to_user_ids: "9,10,11", sender_id: 9}, // non-muted to huddle
        {id: 7, type: "private", to_user_ids: "11", sender_id: 9}, // non-muted to 1:1 PM
        {id: 9, type: "private", to_user_ids: "9", sender_id: 11}, // 1:1 PM to non-muted
    ]);

    // Output filtered based on both topic and user muting.
    mld._all_items = msgs;
    const filtered_messages = mld.unmuted_messages(mld._all_items);
    assert.deepEqual(filtered_messages, [
        {id: 2, type: "stream", stream_id: 1, topic: "whatever"},
        {id: 3, type: "stream", stream_id: 1, topic: "muted", mentioned: true},
        {id: 4, type: "private", to_user_ids: "9,10,11", sender_id: 10},
        {id: 5, type: "private", to_user_ids: "9,10,11", sender_id: 9},
        {id: 7, type: "private", to_user_ids: "11", sender_id: 9},
        {id: 9, type: "private", to_user_ids: "9", sender_id: 11},
    ]);

    // Also verify that, the correct set of messages is stored in `_items`
    // once we update the list for muting.
    mld.update_items_for_muting();
    assert.deepEqual(filtered_messages, mld._items);

    // MessageListData methods should always attempt to filter messages,
    // and keep `_all_items` up-to-date.
    mld = new MessageListData({
        excludes_muted_topics: true,
    });
    assert.deepEqual(mld._all_items, []);

    let unmuted_messages_calls = 0;
    mld.unmuted_messages = (messages) => {
        unmuted_messages_calls = unmuted_messages_calls + 1;
        return messages;
    };

    mld.add_anywhere([{id: 10}, {id: 20}]);
    assert.equal(unmuted_messages_calls, 1);
    assert_msg_ids(mld._all_items, [10, 20]);

    mld.prepend([{id: 9}, {id: 19}]);
    assert.equal(unmuted_messages_calls, 2);
    assert_msg_ids(mld._all_items, [9, 19, 10, 20]);

    mld.append([{id: 11}, {id: 21}]);
    assert.equal(unmuted_messages_calls, 3);
    assert_msg_ids(mld._all_items, [9, 19, 10, 20, 11, 21]);

    mld.remove([9]);
    assert_msg_ids(mld._all_items, [19, 10, 20, 11, 21]);

    mld.reorder_messages(20);
    assert_msg_ids(mld._all_items, [10, 11, 19, 20, 21]);

    mld.clear();
    assert_msg_ids(mld._all_items, []);

    // Test `add_messages` populates the `info` dict **after**
    // filtering the messages.
    mld = new MessageListData({
        excludes_muted_topics: true,
    });

    const orig_messages = [
        {id: 3, type: "stream", stream_id: 1, topic: "muted"},
        {id: 4, type: "stream", stream_id: 1, topic: "whatever"},
        {id: 7, type: "stream", stream_id: 1, topic: "muted"},
        {id: 8, type: "stream", stream_id: 1, topic: "whatever"},
    ];

    const orig_info = mld.add_messages(orig_messages);
    assert.deepEqual(orig_info, {
        top_messages: [],
        interior_messages: [],
        bottom_messages: [
            {id: 4, type: "stream", stream_id: 1, topic: "whatever"},
            {id: 8, type: "stream", stream_id: 1, topic: "whatever"},
        ],
    });

    assert_msg_ids(mld._all_items, [3, 4, 7, 8]);
    assert_msg_ids(mld._items, [4, 8]);

    const more_messages = [
        {id: 1, type: "stream", stream_id: 1, topic: "muted"},
        {id: 2, type: "stream", stream_id: 1, topic: "whatever"},
        {id: 3, type: "stream", stream_id: 1, topic: "muted"}, // dup
        {id: 5, type: "stream", stream_id: 1, topic: "muted"},
        {id: 6, type: "stream", stream_id: 1, topic: "whatever"},
        {id: 9, type: "stream", stream_id: 1, topic: "muted"},
        {id: 10, type: "stream", stream_id: 1, topic: "whatever"},
    ];

    const more_info = mld.add_messages(more_messages);

    assert_msg_ids(mld._all_items, [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
    assert_msg_ids(mld._items, [2, 4, 6, 8, 10]);

    assert.deepEqual(more_info, {
        top_messages: [{id: 2, type: "stream", stream_id: 1, topic: "whatever"}],
        interior_messages: [{id: 6, type: "stream", stream_id: 1, topic: "whatever"}],
        bottom_messages: [{id: 10, type: "stream", stream_id: 1, topic: "whatever"}],
    });
});

run_test("errors", () => {
    const mld = new MessageListData({
        excludes_muted_topics: false,
    });
    assert.equal(mld.get("bogus-id"), undefined);

    assert.throws(
        () => {
            mld._add_to_hash(["asdf"]);
        },
        {message: "Bad message id"},
    );

    blueslip.expect("error", "Duplicate message added to MessageListData");
    mld._hash.set(1, "taken");
    mld._add_to_hash(make_msgs([1]));
});