/*
Copyright 2024 New Vector Ltd.
Copyright 2019, 2020 The Matrix.org Foundation C.I.C.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
Please see LICENSE files in the repository root for full details.
*/

import React from "react";
import { ClientEvent, EmptyObject, MatrixEvent } from "matrix-js-sdk/src/matrix";
import { logger } from "matrix-js-sdk/src/logger";
import { CryptoEvent } from "matrix-js-sdk/src/crypto-api";

import { MatrixClientPeg } from "../../../MatrixClientPeg";
import { _t } from "../../../languageHandler";
import Modal from "../../../Modal";
import Spinner from "../elements/Spinner";
import InteractiveAuthDialog from "../dialogs/InteractiveAuthDialog";
import ConfirmDestroyCrossSigningDialog from "../dialogs/security/ConfirmDestroyCrossSigningDialog";
import SetupEncryptionDialog from "../dialogs/security/SetupEncryptionDialog";
import { accessSecretStorage, withSecretStorageKeyCache } from "../../../SecurityManager";
import AccessibleButton from "../elements/AccessibleButton";
import { SettingsSubsectionText } from "./shared/SettingsSubsection";

interface IState {
    error: boolean;
    crossSigningPublicKeysOnDevice?: boolean;
    crossSigningPrivateKeysInStorage?: boolean;
    masterPrivateKeyCached?: boolean;
    selfSigningPrivateKeyCached?: boolean;
    userSigningPrivateKeyCached?: boolean;
    homeserverSupportsCrossSigning?: boolean;
    crossSigningReady?: boolean;
}

export default class CrossSigningPanel extends React.PureComponent<EmptyObject, IState> {
    private unmounted = false;

    public constructor(props: EmptyObject) {
        super(props);

        this.state = {
            error: false,
        };
    }

    public componentDidMount(): void {
        this.unmounted = false;
        const cli = MatrixClientPeg.safeGet();
        cli.on(ClientEvent.AccountData, this.onAccountData);
        cli.on(CryptoEvent.UserTrustStatusChanged, this.onStatusChanged);
        cli.on(CryptoEvent.KeysChanged, this.onStatusChanged);
        this.getUpdatedStatus();
    }

    public componentWillUnmount(): void {
        this.unmounted = true;
        const cli = MatrixClientPeg.get();
        if (!cli) return;
        cli.removeListener(ClientEvent.AccountData, this.onAccountData);
        cli.removeListener(CryptoEvent.UserTrustStatusChanged, this.onStatusChanged);
        cli.removeListener(CryptoEvent.KeysChanged, this.onStatusChanged);
    }

    private onAccountData = (event: MatrixEvent): void => {
        const type = event.getType();
        if (type.startsWith("m.cross_signing") || type.startsWith("m.secret_storage")) {
            this.getUpdatedStatus();
        }
    };

    private onBootstrapClick = (): void => {
        if (this.state.crossSigningPrivateKeysInStorage) {
            Modal.createDialog(SetupEncryptionDialog, {}, undefined, /* priority = */ false, /* static = */ true);
        } else {
            // Trigger the flow to set up secure backup, which is what this will do when in
            // the appropriate state.
            accessSecretStorage();
        }
    };

    private onStatusChanged = (): void => {
        this.getUpdatedStatus();
    };

    private async getUpdatedStatus(): Promise<void> {
        const cli = MatrixClientPeg.safeGet();
        const crypto = cli.getCrypto();
        if (!crypto) return;

        const crossSigningStatus = await crypto.getCrossSigningStatus();
        const crossSigningPublicKeysOnDevice = crossSigningStatus.publicKeysOnDevice;
        const crossSigningPrivateKeysInStorage = crossSigningStatus.privateKeysInSecretStorage;
        const masterPrivateKeyCached = crossSigningStatus.privateKeysCachedLocally.masterKey;
        const selfSigningPrivateKeyCached = crossSigningStatus.privateKeysCachedLocally.selfSigningKey;
        const userSigningPrivateKeyCached = crossSigningStatus.privateKeysCachedLocally.userSigningKey;
        const homeserverSupportsCrossSigning =
            await cli.doesServerSupportUnstableFeature("org.matrix.e2e_cross_signing");
        const crossSigningReady = await crypto.isCrossSigningReady();

        this.setState({
            crossSigningPublicKeysOnDevice,
            crossSigningPrivateKeysInStorage,
            masterPrivateKeyCached,
            selfSigningPrivateKeyCached,
            userSigningPrivateKeyCached,
            homeserverSupportsCrossSigning,
            crossSigningReady,
        });
    }

    /**
     * Reset the user's cross-signing keys.
     */
    private async resetCrossSigning(): Promise<void> {
        this.setState({ error: false });
        try {
            const cli = MatrixClientPeg.safeGet();
            await withSecretStorageKeyCache(async () => {
                await cli.getCrypto()!.bootstrapCrossSigning({
                    authUploadDeviceSigningKeys: async (makeRequest): Promise<void> => {
                        const { finished } = Modal.createDialog(InteractiveAuthDialog, {
                            title: _t("encryption|bootstrap_title"),
                            matrixClient: cli,
                            makeRequest,
                        });
                        const [confirmed] = await finished;
                        if (!confirmed) {
                            throw new Error("Cross-signing key upload auth canceled");
                        }
                    },
                    setupNewCrossSigning: true,
                });
            });
        } catch (e) {
            this.setState({ error: true });
            logger.error("Error bootstrapping cross-signing", e);
        }
        if (this.unmounted) return;
        this.getUpdatedStatus();
    }

    /**
     * Callback for when the user clicks the "reset cross signing" button.
     *
     * Shows a confirmation dialog, and then does the reset if confirmed.
     */
    private onResetCrossSigningClick = (): void => {
        Modal.createDialog(ConfirmDestroyCrossSigningDialog, {
            onFinished: async (act) => {
                if (!act) return;
                this.resetCrossSigning();
            },
        });
    };

    public render(): React.ReactNode {
        const {
            error,
            crossSigningPublicKeysOnDevice,
            crossSigningPrivateKeysInStorage,
            masterPrivateKeyCached,
            selfSigningPrivateKeyCached,
            userSigningPrivateKeyCached,
            homeserverSupportsCrossSigning,
            crossSigningReady,
        } = this.state;

        let errorSection;
        if (error) {
            errorSection = <div className="error">{error.toString()}</div>;
        }

        let summarisedStatus;
        if (homeserverSupportsCrossSigning === undefined) {
            summarisedStatus = <Spinner />;
        } else if (!homeserverSupportsCrossSigning) {
            summarisedStatus = (
                <SettingsSubsectionText data-testid="summarised-status">
                    {_t("encryption|cross_signing_unsupported")}
                </SettingsSubsectionText>
            );
        } else if (crossSigningReady && crossSigningPrivateKeysInStorage) {
            summarisedStatus = (
                <SettingsSubsectionText data-testid="summarised-status">
                    ✅ {_t("encryption|cross_signing_ready")}
                </SettingsSubsectionText>
            );
        } else if (crossSigningReady && !crossSigningPrivateKeysInStorage) {
            summarisedStatus = (
                <SettingsSubsectionText data-testid="summarised-status">
                    ⚠️ {_t("encryption|cross_signing_ready_no_backup")}
                </SettingsSubsectionText>
            );
        } else if (crossSigningPrivateKeysInStorage) {
            summarisedStatus = (
                <SettingsSubsectionText data-testid="summarised-status">
                    {_t("encryption|cross_signing_untrusted")}
                </SettingsSubsectionText>
            );
        } else {
            summarisedStatus = (
                <SettingsSubsectionText data-testid="summarised-status">
                    {_t("encryption|cross_signing_not_ready")}
                </SettingsSubsectionText>
            );
        }

        const keysExistAnywhere =
            crossSigningPublicKeysOnDevice ||
            crossSigningPrivateKeysInStorage ||
            masterPrivateKeyCached ||
            selfSigningPrivateKeyCached ||
            userSigningPrivateKeyCached;
        const keysExistEverywhere =
            crossSigningPublicKeysOnDevice &&
            crossSigningPrivateKeysInStorage &&
            masterPrivateKeyCached &&
            selfSigningPrivateKeyCached &&
            userSigningPrivateKeyCached;

        const actions: JSX.Element[] = [];

        // TODO: determine how better to expose this to users in addition to prompts at login/toast
        if (!keysExistEverywhere && homeserverSupportsCrossSigning) {
            let buttonCaption = _t("encryption|set_up_toast_title");
            if (crossSigningPrivateKeysInStorage) {
                buttonCaption = _t("encryption|verify_toast_title");
            }
            actions.push(
                <AccessibleButton key="setup" kind="primary_outline" onClick={this.onBootstrapClick}>
                    {buttonCaption}
                </AccessibleButton>,
            );
        }

        if (keysExistAnywhere) {
            actions.push(
                <AccessibleButton key="reset" kind="danger_outline" onClick={this.onResetCrossSigningClick}>
                    {_t("action|reset")}
                </AccessibleButton>,
            );
        }

        let actionRow;
        if (actions.length) {
            actionRow = <div className="mx_CrossSigningPanel_buttonRow">{actions}</div>;
        }

        return (
            <>
                {summarisedStatus}
                <details>
                    <summary className="mx_CrossSigningPanel_advanced">{_t("common|advanced")}</summary>
                    <table className="mx_CrossSigningPanel_statusList">
                        <tbody>
                            <tr>
                                <th scope="row">{_t("settings|security|cross_signing_public_keys")}</th>
                                <td>
                                    {crossSigningPublicKeysOnDevice
                                        ? _t("settings|security|cross_signing_in_memory")
                                        : _t("settings|security|cross_signing_not_found")}
                                </td>
                            </tr>
                            <tr>
                                <th scope="row">{_t("settings|security|cross_signing_private_keys")}</th>
                                <td>
                                    {crossSigningPrivateKeysInStorage
                                        ? _t("settings|security|cross_signing_in_4s")
                                        : _t("settings|security|cross_signing_not_in_4s")}
                                </td>
                            </tr>
                            <tr>
                                <th scope="row">{_t("settings|security|cross_signing_master_private_Key")}</th>
                                <td>
                                    {masterPrivateKeyCached
                                        ? _t("settings|security|cross_signing_cached")
                                        : _t("settings|security|cross_signing_not_cached")}
                                </td>
                            </tr>
                            <tr>
                                <th scope="row">{_t("settings|security|cross_signing_self_signing_private_key")}</th>
                                <td>
                                    {selfSigningPrivateKeyCached
                                        ? _t("settings|security|cross_signing_cached")
                                        : _t("settings|security|cross_signing_not_cached")}
                                </td>
                            </tr>
                            <tr>
                                <th scope="row">{_t("settings|security|cross_signing_user_signing_private_key")}</th>
                                <td>
                                    {userSigningPrivateKeyCached
                                        ? _t("settings|security|cross_signing_cached")
                                        : _t("settings|security|cross_signing_not_cached")}
                                </td>
                            </tr>
                            <tr>
                                <th scope="row">{_t("settings|security|cross_signing_homeserver_support")}</th>
                                <td>
                                    {homeserverSupportsCrossSigning
                                        ? _t("settings|security|cross_signing_homeserver_support_exists")
                                        : _t("settings|security|cross_signing_not_found")}
                                </td>
                            </tr>
                        </tbody>
                    </table>
                </details>
                {errorSection}
                {actionRow}
            </>
        );
    }
}