/*
Copyright 2022 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import "@testing-library/jest-dom";
import React from "react";
import { fireEvent, render, screen, waitFor } from "@testing-library/react";

import MatrixClientContext from "../../../../../src/contexts/MatrixClientContext";
import RoomContext from "../../../../../src/contexts/RoomContext";
import defaultDispatcher from "../../../../../src/dispatcher/dispatcher";
import { Action } from "../../../../../src/dispatcher/actions";
import { IRoomState } from "../../../../../src/components/structures/RoomView";
import { createTestClient, flushPromises, getRoomContext, mkEvent, mkStubRoom } from "../../../../test-utils";
import { SendWysiwygComposer } from "../../../../../src/components/views/rooms/wysiwyg_composer";
import { aboveLeftOf } from "../../../../../src/components/structures/ContextMenu";
import { ComposerInsertPayload, ComposerType } from "../../../../../src/dispatcher/payloads/ComposerInsertPayload";
import { setSelection } from "../../../../../src/components/views/rooms/wysiwyg_composer/utils/selection";

jest.mock("../../../../../src/components/views/rooms/EmojiButton", () => ({
    EmojiButton: ({ addEmoji }: { addEmoji: (emoji: string) => void }) => {
        return (
            <button aria-label="Emoji" type="button" onClick={() => addEmoji("🦫")}>
                Emoji
            </button>
        );
    },
}));

describe("SendWysiwygComposer", () => {
    afterEach(() => {
        jest.resetAllMocks();
    });

    const mockClient = createTestClient();
    const mockEvent = mkEvent({
        type: "m.room.message",
        room: "myfakeroom",
        user: "myfakeuser",
        content: { msgtype: "m.text", body: "Replying to this" },
        event: true,
    });
    const mockRoom = mkStubRoom("myfakeroom", "myfakeroom", mockClient) as any;
    mockRoom.findEventById = jest.fn((eventId) => {
        return eventId === mockEvent.getId() ? mockEvent : null;
    });

    const defaultRoomContext: IRoomState = getRoomContext(mockRoom, {});

    const registerId = defaultDispatcher.register((payload) => {
        switch (payload.action) {
            case Action.ComposerInsert: {
                if (payload.composerType) break;

                // re-dispatch to the correct composer
                defaultDispatcher.dispatch<ComposerInsertPayload>({
                    ...(payload as ComposerInsertPayload),
                    composerType: ComposerType.Send,
                });
                break;
            }
        }
    });

    afterAll(() => {
        defaultDispatcher.unregister(registerId);
    });

    const customRender = (
        onChange = (_content: string): void => void 0,
        onSend = (): void => void 0,
        disabled = false,
        isRichTextEnabled = true,
        placeholder?: string,
    ) => {
        return render(
            <MatrixClientContext.Provider value={mockClient}>
                <RoomContext.Provider value={defaultRoomContext}>
                    <SendWysiwygComposer
                        onChange={onChange}
                        onSend={onSend}
                        disabled={disabled}
                        isRichTextEnabled={isRichTextEnabled}
                        menuPosition={aboveLeftOf({ top: 0, bottom: 0, right: 0 })}
                        placeholder={placeholder}
                    />
                </RoomContext.Provider>
            </MatrixClientContext.Provider>,
        );
    };

    it("Should render WysiwygComposer when isRichTextEnabled is at true", () => {
        // When
        customRender(jest.fn(), jest.fn(), false, true);

        // Then
        expect(screen.getByTestId("WysiwygComposer")).toBeTruthy();
    });

    it("Should render PlainTextComposer when isRichTextEnabled is at false", () => {
        // When
        customRender(jest.fn(), jest.fn(), false, false);

        // Then
        expect(screen.getByTestId("PlainTextComposer")).toBeTruthy();
    });

    describe.each([
        { isRichTextEnabled: true, emptyContent: "<br>" },
        { isRichTextEnabled: false, emptyContent: "" },
    ])(
        "Should focus when receiving an Action.FocusSendMessageComposer action",
        ({ isRichTextEnabled, emptyContent }) => {
            afterEach(() => {
                jest.resetAllMocks();
            });

            it("Should focus when receiving an Action.FocusSendMessageComposer action", async () => {
                // Given we don't have focus
                customRender(jest.fn(), jest.fn(), false, isRichTextEnabled);
                await waitFor(() => expect(screen.getByRole("textbox")).toHaveAttribute("contentEditable", "true"));

                // When we send the right action
                defaultDispatcher.dispatch({
                    action: Action.FocusSendMessageComposer,
                    context: null,
                });

                // Then the component gets the focus
                await waitFor(() => expect(screen.getByRole("textbox")).toHaveFocus());
            });

            it("Should focus and clear when receiving an Action.ClearAndFocusSendMessageComposer", async () => {
                // Given we don't have focus
                const onChange = jest.fn();
                customRender(onChange, jest.fn(), false, isRichTextEnabled);
                await waitFor(() => expect(screen.getByRole("textbox")).toHaveAttribute("contentEditable", "true"));

                fireEvent.input(screen.getByRole("textbox"), {
                    data: "foo bar",
                    inputType: "insertText",
                });

                // When we send the right action
                defaultDispatcher.dispatch({
                    action: Action.ClearAndFocusSendMessageComposer,
                    context: null,
                });

                // Then the component gets the focus
                await waitFor(() => {
                    expect(screen.getByRole("textbox")).toHaveTextContent(/^$/);
                    expect(screen.getByRole("textbox")).toHaveFocus();
                });
            });

            it("Should focus when receiving a reply_to_event action", async () => {
                // Given we don't have focus
                customRender(jest.fn(), jest.fn(), false, isRichTextEnabled);
                await waitFor(() => expect(screen.getByRole("textbox")).toHaveAttribute("contentEditable", "true"));

                // When we send the right action
                defaultDispatcher.dispatch({
                    action: "reply_to_event",
                    context: null,
                });

                // Then the component gets the focus
                await waitFor(() => expect(screen.getByRole("textbox")).toHaveFocus());
            });

            it("Should not focus when disabled", async () => {
                // Given we don't have focus and we are disabled
                customRender(jest.fn(), jest.fn(), true, isRichTextEnabled);
                expect(screen.getByRole("textbox")).not.toHaveFocus();

                // When we send an action that would cause us to get focus
                defaultDispatcher.dispatch({
                    action: Action.FocusSendMessageComposer,
                    context: null,
                });
                // (Send a second event to exercise the clearTimeout logic)
                defaultDispatcher.dispatch({
                    action: Action.FocusSendMessageComposer,
                    context: null,
                });

                // Wait for event dispatch to happen
                await flushPromises();

                // Then we don't get it because we are disabled
                expect(screen.getByRole("textbox")).not.toHaveFocus();
            });
        },
    );

    describe.each([{ isRichTextEnabled: true }, { isRichTextEnabled: false }])(
        "Placeholder when %s",
        ({ isRichTextEnabled }) => {
            afterEach(() => {
                jest.resetAllMocks();
            });

            it("Should not has placeholder", async () => {
                // When
                customRender(jest.fn(), jest.fn(), false, isRichTextEnabled);
                await waitFor(() => expect(screen.getByRole("textbox")).toHaveAttribute("contentEditable", "true"));

                // Then
                expect(screen.getByRole("textbox")).not.toHaveClass("mx_WysiwygComposer_Editor_content_placeholder");
            });

            it("Should has placeholder", async () => {
                // When
                customRender(jest.fn(), jest.fn(), false, isRichTextEnabled, "my placeholder");
                await waitFor(() => expect(screen.getByRole("textbox")).toHaveAttribute("contentEditable", "true"));

                // Then
                expect(screen.getByRole("textbox")).toHaveClass("mx_WysiwygComposer_Editor_content_placeholder");
            });

            it("Should display or not placeholder when editor content change", async () => {
                // When
                customRender(jest.fn(), jest.fn(), false, isRichTextEnabled, "my placeholder");
                await waitFor(() => expect(screen.getByRole("textbox")).toHaveAttribute("contentEditable", "true"));
                screen.getByRole("textbox").innerHTML = "f";
                fireEvent.input(screen.getByRole("textbox"), {
                    data: "f",
                    inputType: "insertText",
                });

                // Then
                await waitFor(() =>
                    expect(screen.getByRole("textbox")).not.toHaveClass(
                        "mx_WysiwygComposer_Editor_content_placeholder",
                    ),
                );

                // When
                screen.getByRole("textbox").innerHTML = "";
                fireEvent.input(screen.getByRole("textbox"), {
                    inputType: "deleteContentBackward",
                });

                // Then
                await waitFor(() =>
                    expect(screen.getByRole("textbox")).toHaveClass("mx_WysiwygComposer_Editor_content_placeholder"),
                );
            });
        },
    );

    describe.each([{ isRichTextEnabled: true }, { isRichTextEnabled: false }])(
        "Emoji when %s",
        ({ isRichTextEnabled }) => {
            let emojiButton: HTMLElement;

            beforeEach(async () => {
                customRender(jest.fn(), jest.fn(), false, isRichTextEnabled);
                await waitFor(() => expect(screen.getByRole("textbox")).toHaveAttribute("contentEditable", "true"));
                emojiButton = screen.getByLabelText("Emoji");
            });

            afterEach(() => {
                jest.resetAllMocks();
            });

            it("Should add an emoji in an empty composer", async () => {
                // When
                emojiButton.click();

                // Then
                await waitFor(() => expect(screen.getByRole("textbox")).toHaveTextContent(/🦫/));
            });

            it("Should add an emoji in the middle of a word", async () => {
                // When
                screen.getByRole("textbox").focus();
                screen.getByRole("textbox").innerHTML = "word";
                fireEvent.input(screen.getByRole("textbox"), {
                    data: "word",
                    inputType: "insertText",
                });

                const textNode = screen.getByRole("textbox").firstChild;
                setSelection({
                    anchorNode: textNode,
                    anchorOffset: 2,
                    focusNode: textNode,
                    focusOffset: 2,
                });
                // the event is not automatically fired by jest
                document.dispatchEvent(new CustomEvent("selectionchange"));

                emojiButton.click();

                // Then
                await waitFor(() => expect(screen.getByRole("textbox")).toHaveTextContent(/wo🦫rd/));
            });
        },
    );
});