/*
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 React from "react";
import { mocked } from "jest-mock";
import { act, render, RenderResult, screen } from "@testing-library/react";
import userEvent from "@testing-library/user-event";
import { MatrixClient, createClient } from "matrix-js-sdk/src/matrix";

import ForgotPassword from "../../../../src/components/structures/auth/ForgotPassword";
import { ValidatedServerConfig } from "../../../../src/utils/ValidatedServerConfig";
import {
    clearAllModals,
    filterConsole,
    flushPromisesWithFakeTimers,
    stubClient,
    waitEnoughCyclesForModal,
} from "../../../test-utils";
import AutoDiscoveryUtils from "../../../../src/utils/AutoDiscoveryUtils";

jest.mock("matrix-js-sdk/src/matrix", () => ({
    ...jest.requireActual("matrix-js-sdk/src/matrix"),
    createClient: jest.fn(),
}));

describe("<ForgotPassword>", () => {
    const testEmail = "user@example.com";
    const testSid = "sid42";
    const testPassword = "cRaZyP4ssw0rd!";
    let client: MatrixClient;
    let serverConfig: ValidatedServerConfig;
    let onComplete: () => void;
    let onLoginClick: () => void;
    let renderResult: RenderResult;

    const typeIntoField = async (label: string, value: string): Promise<void> => {
        await act(async () => {
            await userEvent.type(screen.getByLabelText(label), value, { delay: null });
            // the message is shown after some time
            jest.advanceTimersByTime(500);
        });
    };

    const click = async (element: Element): Promise<void> => {
        await act(async () => {
            await userEvent.click(element, { delay: null });
        });
    };

    const itShouldCloseTheDialogAndShowThePasswordInput = (): void => {
        it("should close the dialog and show the password input", () => {
            expect(screen.queryByText("Verify your email to continue")).not.toBeInTheDocument();
            expect(screen.getByText("Reset your password")).toBeInTheDocument();
        });
    };

    filterConsole(
        // not implemented by js-dom https://github.com/jsdom/jsdom/issues/1937
        "Not implemented: HTMLFormElement.prototype.requestSubmit",
    );

    beforeEach(() => {
        client = stubClient();
        mocked(createClient).mockReturnValue(client);

        serverConfig = { hsName: "example.com" } as ValidatedServerConfig;

        onComplete = jest.fn();
        onLoginClick = jest.fn();

        jest.spyOn(AutoDiscoveryUtils, "validateServerConfigWithStaticUrls").mockResolvedValue(serverConfig);
        jest.spyOn(AutoDiscoveryUtils, "authComponentStateForError");
    });

    afterEach(async () => {
        // clean up modals
        await clearAllModals();
    });

    beforeAll(() => {
        jest.useFakeTimers();
    });

    afterAll(() => {
        jest.useRealTimers();
    });

    describe("when starting a password reset flow", () => {
        beforeEach(() => {
            renderResult = render(
                <ForgotPassword serverConfig={serverConfig} onComplete={onComplete} onLoginClick={onLoginClick} />,
            );
        });

        it("should show the email input and mention the homeserver", () => {
            expect(screen.queryByLabelText("Email address")).toBeInTheDocument();
            expect(screen.queryByText("example.com")).toBeInTheDocument();
        });

        describe("and updating the server config", () => {
            beforeEach(() => {
                serverConfig.hsName = "example2.com";
                renderResult.rerender(
                    <ForgotPassword serverConfig={serverConfig} onComplete={onComplete} onLoginClick={onLoginClick} />,
                );
            });

            it("should show the new homeserver server name", () => {
                expect(screen.queryByText("example2.com")).toBeInTheDocument();
            });
        });

        describe("and clicking »Sign in instead«", () => {
            beforeEach(async () => {
                await click(screen.getByText("Sign in instead"));
            });

            it("should call onLoginClick()", () => {
                expect(onLoginClick).toHaveBeenCalled();
            });
        });

        describe("and entering a non-email value", () => {
            beforeEach(async () => {
                await typeIntoField("Email address", "not en email");
            });

            it("should show a message about the wrong format", () => {
                expect(screen.getByText("The email address doesn't appear to be valid.")).toBeInTheDocument();
            });
        });

        describe("and submitting an unknown email", () => {
            beforeEach(async () => {
                await typeIntoField("Email address", testEmail);
                mocked(client).requestPasswordEmailToken.mockRejectedValue({
                    errcode: "M_THREEPID_NOT_FOUND",
                });
                await click(screen.getByText("Send email"));
            });

            it("should show an email not found message", () => {
                expect(screen.getByText("This email address was not found")).toBeInTheDocument();
            });
        });

        describe("and a connection error occurs", () => {
            beforeEach(async () => {
                await typeIntoField("Email address", testEmail);
                mocked(client).requestPasswordEmailToken.mockRejectedValue({
                    name: "ConnectionError",
                });
                await click(screen.getByText("Send email"));
            });

            it("should show an info about that", () => {
                expect(
                    screen.getByText(
                        "Cannot reach homeserver: " +
                            "Ensure you have a stable internet connection, or get in touch with the server admin",
                    ),
                ).toBeInTheDocument();
            });
        });

        describe("and the server liveness check fails", () => {
            beforeEach(async () => {
                await typeIntoField("Email address", testEmail);
                mocked(AutoDiscoveryUtils.validateServerConfigWithStaticUrls).mockRejectedValue({});
                mocked(AutoDiscoveryUtils.authComponentStateForError).mockReturnValue({
                    serverErrorIsFatal: true,
                    serverIsAlive: false,
                    serverDeadError: "server down",
                });
                await click(screen.getByText("Send email"));
            });

            it("should show the server error", () => {
                expect(screen.queryByText("server down")).toBeInTheDocument();
            });
        });

        describe("and submitting an known email", () => {
            beforeEach(async () => {
                await typeIntoField("Email address", testEmail);
                mocked(client).requestPasswordEmailToken.mockResolvedValue({
                    sid: testSid,
                });
                await click(screen.getByText("Send email"));
            });

            it("should send the mail and show the check email view", () => {
                expect(client.requestPasswordEmailToken).toHaveBeenCalledWith(
                    testEmail,
                    expect.any(String),
                    1, // second send attempt
                );
                expect(screen.getByText("Check your email to continue")).toBeInTheDocument();
                expect(screen.getByText(testEmail)).toBeInTheDocument();
            });

            describe("and clicking »Re-enter email address«", () => {
                beforeEach(async () => {
                    await click(screen.getByText("Re-enter email address"));
                });

                it("go back to the email input", () => {
                    expect(screen.queryByText("Enter your email to reset password")).toBeInTheDocument();
                });
            });

            describe("and clicking »Resend«", () => {
                beforeEach(async () => {
                    await click(screen.getByText("Resend"));
                    // the message is shown after some time
                    jest.advanceTimersByTime(500);
                });

                it("should should resend the mail and show the tooltip", () => {
                    expect(client.requestPasswordEmailToken).toHaveBeenCalledWith(
                        testEmail,
                        expect.any(String),
                        2, // second send attempt
                    );
                    expect(
                        screen.getByRole("tooltip", { name: "Verification link email resent!" }),
                    ).toBeInTheDocument();
                });
            });

            describe("and clicking »Next«", () => {
                beforeEach(async () => {
                    await click(screen.getByText("Next"));
                });

                it("should show the password input view", () => {
                    expect(screen.getByText("Reset your password")).toBeInTheDocument();
                });

                describe("and entering different passwords", () => {
                    beforeEach(async () => {
                        await typeIntoField("New Password", testPassword);
                        await typeIntoField("Confirm new password", testPassword + "asd");
                    });

                    it("should show an info about that", () => {
                        expect(screen.getByText("New passwords must match each other.")).toBeInTheDocument();
                    });
                });

                describe("and entering a new password", () => {
                    beforeEach(async () => {
                        mocked(client.setPassword).mockRejectedValue({ httpStatus: 401 });
                        await typeIntoField("New Password", testPassword);
                        await typeIntoField("Confirm new password", testPassword);
                    });

                    describe("and submitting it running into rate limiting", () => {
                        beforeEach(async () => {
                            mocked(client.setPassword).mockRejectedValue({
                                message: "rate limit reached",
                                httpStatus: 429,
                                data: {
                                    retry_after_ms: (13 * 60 + 37) * 1000,
                                },
                            });
                            await click(screen.getByText("Reset password"));
                        });

                        it("should show the rate limit error message", () => {
                            expect(
                                screen.getByText("Too many attempts in a short time. Retry after 13:37."),
                            ).toBeInTheDocument();
                        });
                    });

                    describe("and confirm the email link and submitting the new password", () => {
                        beforeEach(async () => {
                            // fake link confirmed by resolving client.setPassword instead of raising an error
                            mocked(client.setPassword).mockResolvedValue({});
                            await click(screen.getByText("Reset password"));
                        });

                        it("should send the new password (once)", () => {
                            expect(client.setPassword).toHaveBeenCalledWith(
                                {
                                    type: "m.login.email.identity",
                                    threepid_creds: {
                                        client_secret: expect.any(String),
                                        sid: testSid,
                                    },
                                },
                                testPassword,
                                false,
                            );

                            // be sure that the next attempt to set the password would have been sent
                            jest.advanceTimersByTime(3000);
                            // it should not retry to set the password
                            expect(client.setPassword).toHaveBeenCalledTimes(1);
                        });
                    });

                    describe("and submitting it", () => {
                        beforeEach(async () => {
                            await click(screen.getByText("Reset password"));
                            await waitEnoughCyclesForModal({
                                useFakeTimers: true,
                            });
                        });

                        it("should send the new password and show the click validation link dialog", () => {
                            expect(client.setPassword).toHaveBeenCalledWith(
                                {
                                    type: "m.login.email.identity",
                                    threepid_creds: {
                                        client_secret: expect.any(String),
                                        sid: testSid,
                                    },
                                },
                                testPassword,
                                false,
                            );
                            expect(screen.getByText("Verify your email to continue")).toBeInTheDocument();
                            expect(screen.getByText(testEmail)).toBeInTheDocument();
                        });

                        describe("and dismissing the dialog by clicking the background", () => {
                            beforeEach(async () => {
                                await act(async () => {
                                    await userEvent.click(screen.getByTestId("dialog-background"), { delay: null });
                                });
                                await waitEnoughCyclesForModal({
                                    useFakeTimers: true,
                                });
                            });

                            itShouldCloseTheDialogAndShowThePasswordInput();
                        });

                        describe("and dismissing the dialog", () => {
                            beforeEach(async () => {
                                await click(screen.getByLabelText("Close dialog"));
                                await waitEnoughCyclesForModal({
                                    useFakeTimers: true,
                                });
                            });

                            itShouldCloseTheDialogAndShowThePasswordInput();
                        });

                        describe("and clicking »Re-enter email address«", () => {
                            beforeEach(async () => {
                                await click(screen.getByText("Re-enter email address"));
                                await waitEnoughCyclesForModal({
                                    useFakeTimers: true,
                                });
                            });

                            it("should close the dialog and go back to the email input", () => {
                                expect(screen.queryByText("Verify your email to continue")).not.toBeInTheDocument();
                                expect(screen.queryByText("Enter your email to reset password")).toBeInTheDocument();
                            });
                        });

                        describe("and validating the link from the mail", () => {
                            beforeEach(async () => {
                                mocked(client.setPassword).mockResolvedValue({});
                                // be sure the next set password attempt was sent
                                jest.advanceTimersByTime(3000);
                                // quad flush promises for the modal to disappear
                                await flushPromisesWithFakeTimers();
                                await flushPromisesWithFakeTimers();
                                await flushPromisesWithFakeTimers();
                                await flushPromisesWithFakeTimers();
                            });

                            it("should display the confirm reset view and now show the dialog", () => {
                                expect(screen.queryByText("Your password has been reset.")).toBeInTheDocument();
                                expect(screen.queryByText("Verify your email to continue")).not.toBeInTheDocument();
                            });
                        });
                    });

                    describe("and clicking »Sign out of all devices« and »Reset password«", () => {
                        beforeEach(async () => {
                            await click(screen.getByText("Sign out of all devices"));
                            await click(screen.getByText("Reset password"));
                            await waitEnoughCyclesForModal({
                                useFakeTimers: true,
                            });
                        });

                        it("should show the sign out warning dialog", async () => {
                            expect(
                                screen.getByText(
                                    "Signing out your devices will delete the message encryption keys stored on them, making encrypted chat history unreadable.",
                                ),
                            ).toBeInTheDocument();

                            // confirm dialog
                            await click(screen.getByText("Continue"));

                            // expect setPassword with logoutDevices = true
                            expect(client.setPassword).toHaveBeenCalledWith(
                                {
                                    type: "m.login.email.identity",
                                    threepid_creds: {
                                        client_secret: expect.any(String),
                                        sid: testSid,
                                    },
                                },
                                testPassword,
                                true,
                            );
                        });
                    });
                });
            });
        });
    });
});