/*
Copyright 2021 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 React from "react";
import { act, render, screen, waitFor } from "@testing-library/react";
import { mocked, MockedObject } from "jest-mock";
import userEvent from "@testing-library/user-event";
import fetchMock from "fetch-mock-jest";

import { ThemeChoicePanel } from "../../../../src/components/views/settings/ThemeChoicePanel";
import SettingsStore from "../../../../src/settings/SettingsStore";
import ThemeWatcher from "../../../../src/settings/watchers/ThemeWatcher";
import { SettingLevel } from "../../../../src/settings/SettingLevel";

jest.mock("../../../../src/settings/watchers/ThemeWatcher");

describe("<ThemeChoicePanel />", () => {
    /**
     * Enable or disable the system theme
     * @param enable
     */
    async function enableSystemTheme(enable: boolean) {
        await SettingsStore.setValue("use_system_theme", null, SettingLevel.DEVICE, enable);
    }

    /**
     * Set the theme
     * @param theme
     */
    async function setTheme(theme: string) {
        await SettingsStore.setValue("theme", null, SettingLevel.DEVICE, theme);
    }

    beforeEach(async () => {
        mocked(ThemeWatcher).mockImplementation(() => {
            return {
                isSystemThemeSupported: jest.fn().mockReturnValue(true),
            } as unknown as MockedObject<ThemeWatcher>;
        });

        await enableSystemTheme(false);
        await setTheme("light");
    });

    it("renders the theme choice UI", () => {
        const { asFragment } = render(<ThemeChoicePanel />);
        expect(asFragment()).toMatchSnapshot();
    });

    describe("theme selection", () => {
        describe("system theme", () => {
            it("should disable Match system theme", async () => {
                render(<ThemeChoicePanel />);
                expect(screen.getByRole("checkbox", { name: "Match system theme" })).not.toBeChecked();
            });

            it("should enable Match system theme", async () => {
                await enableSystemTheme(true);

                render(<ThemeChoicePanel />);
                expect(screen.getByRole("checkbox", { name: "Match system theme" })).toBeChecked();
            });

            it("should change the system theme when clicked", async () => {
                jest.spyOn(SettingsStore, "setValue");

                render(<ThemeChoicePanel />);
                act(() => screen.getByRole("checkbox", { name: "Match system theme" }).click());

                // The system theme should be enabled
                expect(screen.getByRole("checkbox", { name: "Match system theme" })).toBeChecked();
                expect(SettingsStore.setValue).toHaveBeenCalledWith("use_system_theme", null, "device", true);
            });
        });

        describe("theme selection", () => {
            it("should disable theme selection when system theme is enabled", async () => {
                await enableSystemTheme(true);
                render(<ThemeChoicePanel />);

                // We expect all the themes to be disabled
                const themes = screen.getAllByRole("radio");
                themes.forEach((theme) => {
                    expect(theme).toBeDisabled();
                });
            });

            it("should enable theme selection when system theme is disabled", async () => {
                render(<ThemeChoicePanel />);

                // We expect all the themes to be disabled
                const themes = screen.getAllByRole("radio");
                themes.forEach((theme) => {
                    expect(theme).not.toBeDisabled();
                });
            });

            it("should have light theme selected", async () => {
                render(<ThemeChoicePanel />);

                // We expect the light theme to be selected
                const lightTheme = screen.getByRole("radio", { name: "Light" });
                expect(lightTheme).toBeChecked();

                // And the dark theme shouldn't be selected
                const darkTheme = screen.getByRole("radio", { name: "Dark" });
                expect(darkTheme).not.toBeChecked();
            });

            it("should switch to dark theme", async () => {
                jest.spyOn(SettingsStore, "setValue");

                render(<ThemeChoicePanel />);

                const darkTheme = screen.getByRole("radio", { name: "Dark" });
                const lightTheme = screen.getByRole("radio", { name: "Light" });
                expect(darkTheme).not.toBeChecked();

                // Switch to the dark theme
                act(() => darkTheme.click());
                expect(SettingsStore.setValue).toHaveBeenCalledWith("theme", null, "device", "dark");

                // Dark theme is now selected
                await waitFor(() => expect(darkTheme).toBeChecked());
                // Light theme is not selected anymore
                expect(lightTheme).not.toBeChecked();
                // The setting should be updated
                expect(SettingsStore.setValue).toHaveBeenCalledWith("theme", null, "device", "dark");
            });
        });
    });

    describe("custom theme", () => {
        const aliceTheme = { name: "Alice theme", is_dark: true, colors: {} };
        const bobTheme = { name: "Bob theme", is_dark: false, colors: {} };

        beforeEach(async () => {
            await SettingsStore.setValue("feature_custom_themes", null, SettingLevel.DEVICE, true);
            await SettingsStore.setValue("custom_themes", null, SettingLevel.DEVICE, [aliceTheme]);
        });

        it("should render the custom theme section", () => {
            const { asFragment } = render(<ThemeChoicePanel />);
            expect(asFragment()).toMatchSnapshot();
        });

        it("should add a custom theme", async () => {
            jest.spyOn(SettingsStore, "setValue");
            // Respond to the theme request
            fetchMock.get("http://bob.theme", {
                body: bobTheme,
            });

            render(<ThemeChoicePanel />);

            // Add the new custom theme
            const customThemeInput = screen.getByRole("textbox", { name: "Add custom theme" });
            await userEvent.type(customThemeInput, "http://bob.theme");
            screen.getByRole("button", { name: "Add custom theme" }).click();

            // The new custom theme is added to the user's themes
            await waitFor(() =>
                expect(SettingsStore.setValue).toHaveBeenCalledWith("custom_themes", null, "account", [
                    aliceTheme,
                    bobTheme,
                ]),
            );
        });

        it("should display custom theme", () => {
            const { asFragment } = render(<ThemeChoicePanel />);

            expect(screen.getByRole("radio", { name: aliceTheme.name })).toBeInTheDocument();
            expect(screen.getByRole("listitem", { name: aliceTheme.name })).toBeInTheDocument();
            expect(asFragment()).toMatchSnapshot();
        });
    });
});