"use strict";

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

const {mock_cjs, mock_esm, set_global, zrequire} = require("../zjsunit/namespace");
const {run_test} = require("../zjsunit/test");
const blueslip = require("../zjsunit/zblueslip");
const $ = require("../zjsunit/zjquery");

set_global("document", {});

const noop = () => {};
const example_img_link = "http://example.com/example.png";

mock_cjs("jquery", $);
mock_esm("../../static/js/ui_util", {
    place_caret_at_end: noop,
});

set_global("getSelection", () => ({
    anchorOffset: 0,
}));

zrequire("templates");
const input_pill = zrequire("input_pill");

function pill_html(value, data_id, img_src) {
    const has_image = img_src !== undefined;

    const opts = {
        id: data_id,
        display_value: value,
        has_image,
    };

    if (has_image) {
        opts.img_src = img_src;
    }

    return require("../../static/templates/input_pill.hbs")(opts);
}

function override_random_id(override) {
    let id_seq = 0;
    override(input_pill, "random_id", () => {
        id_seq += 1;
        return "some_id" + id_seq;
    });
}

run_test("random_id", () => {
    // just get coverage on a simple one-liner:
    input_pill.random_id();
});

run_test("basics", (override) => {
    override_random_id(override);
    const config = {};

    blueslip.expect("error", "Pill needs container.");
    input_pill.create(config);

    const pill_input = $.create("pill_input");
    const container = $.create("container");
    container.set_find_results(".input", pill_input);

    blueslip.expect("error", "Pill needs create_item_from_text");
    config.container = container;
    input_pill.create(config);

    blueslip.expect("error", "Pill needs get_text_from_item");
    config.create_item_from_text = noop;
    input_pill.create(config);

    config.get_text_from_item = noop;
    const widget = input_pill.create(config);

    // type for a pill can be any string but it needs to be
    // defined while creating any pill.
    const item = {
        display_value: "JavaScript",
        language: "js",
        type: "language",
        img_src: example_img_link,
    };

    let inserted_before;
    const expected_html = pill_html("JavaScript", "some_id1", example_img_link);

    pill_input.before = (elem) => {
        inserted_before = true;
        assert.equal(elem.html(), expected_html);
    };

    widget.appendValidatedData(item);
    assert(inserted_before);

    assert.deepEqual(widget.items(), [item]);
});

function set_up() {
    const items = {
        blue: {
            display_value: "BLUE",
            description: "color of the sky",
            type: "color",
            img_src: example_img_link,
        },

        red: {
            display_value: "RED",
            type: "color",
            description: "color of stop signs",
        },

        yellow: {
            display_value: "YELLOW",
            type: "color",
            description: "color of bananas",
        },
    };

    const pill_input = $.create("pill_input");

    pill_input[0] = {};
    pill_input.before = () => {};

    const create_item_from_text = (text) => items[text];

    const container = $.create("container");
    container.set_find_results(".input", pill_input);

    const config = {
        container,
        create_item_from_text,
        get_text_from_item: (item) => item.display_value,
    };

    return {
        config,
        pill_input,
        items,
        container,
    };
}

run_test("copy from pill", (override) => {
    override_random_id(override);
    const info = set_up();
    const config = info.config;
    const container = info.container;

    const widget = input_pill.create(config);
    widget.appendValue("blue,red");

    const copy_handler = container.get_on_handler("copy", ".pill");

    let copied_text;

    const pill_stub = {
        data: (field) => {
            assert.equal(field, "id");
            return "some_id2";
        },
    };

    const e = {
        originalEvent: {
            clipboardData: {
                setData: (format, text) => {
                    assert.equal(format, "text/plain");
                    copied_text = text;
                },
            },
        },
        preventDefault: noop,
    };

    container.set_find_results(":focus", pill_stub);

    copy_handler(e);

    assert.equal(copied_text, "RED");
});

run_test("paste to input", () => {
    const info = set_up();
    const config = info.config;
    const container = info.container;
    const items = info.items;

    const widget = input_pill.create(config);

    const paste_handler = container.get_on_handler("paste", ".input");

    const paste_text = "blue,yellow";

    const e = {
        originalEvent: {
            clipboardData: {
                getData: (format) => {
                    assert.equal(format, "text/plain");
                    return paste_text;
                },
            },
        },
        preventDefault: noop,
    };

    document.execCommand = (cmd, _, text) => {
        assert.equal(cmd, "insertText");
        container.find(".input").text(text);
    };

    paste_handler(e);

    assert.deepEqual(widget.items(), [items.blue, items.yellow]);

    let entered = false;
    widget.createPillonPaste(() => {
        entered = true;
    });

    paste_handler(e);
    assert(entered);
});

run_test("arrows on pills", () => {
    const info = set_up();
    const config = info.config;
    const container = info.container;

    const widget = input_pill.create(config);
    widget.appendValue("blue,red");

    const key_handler = container.get_on_handler("keydown", ".pill");

    function test_key(c) {
        key_handler({
            charCode: c,
        });
    }

    const LEFT_ARROW = 37;
    const RIGHT_ARROW = 39;

    let prev_focused = false;
    let next_focused = false;

    const pill_stub = {
        prev: () => ({
            trigger: (type) => {
                if (type === "focus") {
                    prev_focused = true;
                }
            },
        }),
        next: () => ({
            trigger: (type) => {
                if (type === "focus") {
                    next_focused = true;
                }
            },
        }),
    };

    container.set_find_results(".pill:focus", pill_stub);

    // We use the same stub to test both arrows, since we don't
    // actually cause any real state changes here.  We stub out
    // the only interaction, which is to move the focus.
    test_key(LEFT_ARROW);
    assert(prev_focused);

    test_key(RIGHT_ARROW);
    assert(next_focused);
});

run_test("left arrow on input", () => {
    const info = set_up();
    const config = info.config;
    const container = info.container;

    const widget = input_pill.create(config);
    widget.appendValue("blue,red");

    const LEFT_ARROW = 37;
    const key_handler = container.get_on_handler("keydown", ".input");

    let last_pill_focused = false;

    container.set_find_results(".pill", {
        last: () => ({
            trigger: (type) => {
                if (type === "focus") {
                    last_pill_focused = true;
                }
            },
        }),
    });

    key_handler({
        keyCode: LEFT_ARROW,
    });

    assert(last_pill_focused);
});

run_test("comma", () => {
    const info = set_up();
    const config = info.config;
    const items = info.items;
    const pill_input = info.pill_input;
    const container = info.container;

    const widget = input_pill.create(config);
    widget.appendValue("blue,red");

    assert.deepEqual(widget.items(), [items.blue, items.red]);

    const COMMA = 188;
    const key_handler = container.get_on_handler("keydown", ".input");

    pill_input.text(" yel");

    key_handler({
        keyCode: COMMA,
        preventDefault: noop,
    });

    assert.deepEqual(widget.items(), [items.blue, items.red]);

    pill_input.text(" yellow");

    key_handler({
        keyCode: COMMA,
        preventDefault: noop,
    });

    assert.deepEqual(widget.items(), [items.blue, items.red, items.yellow]);
});

run_test("Enter key with text", () => {
    const info = set_up();
    const config = info.config;
    const items = info.items;
    const container = info.container;

    const widget = input_pill.create(config);
    widget.appendValue("blue,red");

    assert.deepEqual(widget.items(), [items.blue, items.red]);

    const ENTER = 13;
    const key_handler = container.get_on_handler("keydown", ".input");

    key_handler({
        keyCode: ENTER,
        preventDefault: noop,
        stopPropagation: noop,
        target: {
            textContent: " yellow ",
        },
    });

    assert.deepEqual(widget.items(), [items.blue, items.red, items.yellow]);
});

run_test("insert_remove", (override) => {
    override_random_id(override);
    const info = set_up();

    const config = info.config;
    const pill_input = info.pill_input;
    const items = info.items;
    const container = info.container;

    const inserted_html = [];
    pill_input.before = (elem) => {
        inserted_html.push(elem.html());
    };

    const widget = input_pill.create(config);

    let created;
    let removed;

    widget.onPillCreate(() => {
        created = true;
    });

    widget.onPillRemove(() => {
        removed = true;
    });

    widget.appendValue("blue,chartreuse,red,yellow,mauve");

    assert(created);
    assert(!removed);

    assert.deepEqual(inserted_html, [
        pill_html("BLUE", "some_id1", example_img_link),
        pill_html("RED", "some_id2"),
        pill_html("YELLOW", "some_id3"),
    ]);

    assert.deepEqual(widget.items(), [items.blue, items.red, items.yellow]);

    assert.equal(pill_input.text(), "chartreuse, mauve");

    assert.equal(widget.is_pending(), true);
    widget.clear_text();
    assert.equal(pill_input.text(), "");
    assert.equal(widget.is_pending(), false);

    let color_removed;
    function set_colored_removed_func(color) {
        return () => {
            color_removed = color;
        };
    }

    const pills = widget._get_pills_for_testing();
    for (const pill of pills) {
        pill.$element.remove = set_colored_removed_func(pill.item.display_value);
    }

    const BACKSPACE = 8;
    let key_handler = container.get_on_handler("keydown", ".input");

    key_handler({
        keyCode: BACKSPACE,
        target: {
            textContent: "",
        },
        preventDefault: noop,
    });

    assert(removed);
    assert.equal(color_removed, "YELLOW");

    assert.deepEqual(widget.items(), [items.blue, items.red]);

    let next_pill_focused = false;

    const next_pill_stub = {
        trigger: (type) => {
            if (type === "focus") {
                next_pill_focused = true;
            }
        },
    };

    const focus_pill_stub = {
        next: () => next_pill_stub,
        data: (field) => {
            assert.equal(field, "id");
            return "some_id1";
        },
    };

    container.set_find_results(".pill:focus", focus_pill_stub);

    key_handler = container.get_on_handler("keydown", ".pill");
    key_handler({
        keyCode: BACKSPACE,
        preventDefault: noop,
    });

    assert.equal(color_removed, "BLUE");
    assert(next_pill_focused);
});

run_test("exit button on pill", (override) => {
    override_random_id(override);
    const info = set_up();

    const config = info.config;
    const items = info.items;
    const container = info.container;

    const widget = input_pill.create(config);

    widget.appendValue("blue,red");

    const pills = widget._get_pills_for_testing();
    for (const pill of pills) {
        pill.$element.remove = () => {};
    }

    let next_pill_focused = false;

    const next_pill_stub = {
        trigger: (type) => {
            if (type === "focus") {
                next_pill_focused = true;
            }
        },
    };

    const curr_pill_stub = {
        next: () => next_pill_stub,
        data: (field) => {
            assert.equal(field, "id");
            return "some_id1";
        },
    };

    const exit_button_stub = {
        to_$: () => ({
            closest: (sel) => {
                assert.equal(sel, ".pill");
                return curr_pill_stub;
            },
        }),
    };

    const e = {
        stopPropagation: noop,
    };
    const exit_click_handler = container.get_on_handler("click", ".exit");

    exit_click_handler.call(exit_button_stub, e);

    assert(next_pill_focused);

    assert.deepEqual(widget.items(), [items.red]);
});

run_test("misc things", () => {
    const info = set_up();

    const config = info.config;
    const container = info.container;
    const pill_input = info.pill_input;

    const widget = input_pill.create(config);

    // animation
    const animation_end_handler = container.get_on_handler("animationend", ".input");

    let shake_class_removed = false;

    const input_stub = {
        to_$: () => ({
            removeClass: (cls) => {
                assert.equal(cls, "shake");
                shake_class_removed = true;
            },
        }),
    };

    animation_end_handler.call(input_stub);
    assert(shake_class_removed);

    // bad data
    blueslip.expect("error", "no display_value returned");
    widget.appendValidatedData("this-has-no-item-attribute");

    blueslip.expect("error", "no type defined for the item");
    widget.appendValidatedData({
        display_value: "This item has no type.",
        language: "js",
        img_src: example_img_link,
    });

    // click on container
    const container_click_handler = container.get_on_handler("click");

    const stub = $.create("the-pill-container");
    stub.set_find_results(".input", pill_input);
    stub.is = (sel) => {
        assert.equal(sel, ".pill-container");
        return true;
    };

    const this_ = {
        to_$: () => stub,
    };

    container_click_handler.call(this_, {target: this_});
});

run_test("appendValue/clear", () => {
    const pill_input = $.create("pill_input");
    const container = $.create("container");
    container.set_find_results(".input", pill_input);

    const config = {
        container,
        create_item_from_text: (s) => ({type: "color", display_value: s}),
        get_text_from_item: (s) => s.display_value,
    };

    pill_input.before = () => {};
    pill_input[0] = {};

    const widget = input_pill.create(config);

    // First test some early-exit code.
    widget.appendValue("");
    assert.deepEqual(widget._get_pills_for_testing(), []);

    // Now set up real data.
    widget.appendValue("red,yellow,blue");

    const pills = widget._get_pills_for_testing();

    const removed_colors = [];
    for (const pill of pills) {
        pill.$element.remove = () => {
            removed_colors.push(pill.item.display_value);
        };
    }

    widget.clear();

    // Note that we remove colors in the reverse order that we inserted.
    assert.deepEqual(removed_colors, ["blue", "yellow", "red"]);
    assert.equal(pill_input[0].textContent, "");
});