/*
Copyright 2018, 2019 New Vector Ltd
Copyright 2020 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 { IKeyBackupInfo } from "matrix-js-sdk/src/crypto/keybackup";
import Modal from '../../../Modal';
import * as sdk from '../../../index';
import dis from '../../../dispatcher/dispatcher';
import { _t } from '../../../languageHandler';
import { MatrixClientPeg } from '../../../MatrixClientPeg';
import RestoreKeyBackupDialog from './security/RestoreKeyBackupDialog';
import { replaceableComponent } from "../../../utils/replaceableComponent";

interface IProps {
    onFinished: (success: boolean) => void;
}

interface IState {
    shouldLoadBackupStatus: boolean;
    loading: boolean;
    backupInfo: IKeyBackupInfo;
    error?: string;
}

@replaceableComponent("views.dialogs.LogoutDialog")
export default class LogoutDialog extends React.Component<IProps, IState> {
    static defaultProps = {
        onFinished: function() {},
    };

    constructor(props) {
        super(props);

        const cli = MatrixClientPeg.get();
        const shouldLoadBackupStatus = cli.isCryptoEnabled() && !cli.getKeyBackupEnabled();

        this.state = {
            shouldLoadBackupStatus: shouldLoadBackupStatus,
            loading: shouldLoadBackupStatus,
            backupInfo: null,
            error: null,
        };

        if (shouldLoadBackupStatus) {
            this.loadBackupStatus();
        }
    }

    private async loadBackupStatus() {
        try {
            const backupInfo = await MatrixClientPeg.get().getKeyBackupVersion();
            this.setState({
                loading: false,
                backupInfo,
            });
        } catch (e) {
            console.log("Unable to fetch key backup status", e);
            this.setState({
                loading: false,
                error: e,
            });
        }
    }

    private onSettingsLinkClick = (): void => {
        // close dialog
        this.props.onFinished(true);
    };

    private onExportE2eKeysClicked = (): void => {
        Modal.createTrackedDialogAsync('Export E2E Keys', '',
            import('../../../async-components/views/dialogs/security/ExportE2eKeysDialog'),
            {
                matrixClient: MatrixClientPeg.get(),
            },
        );
    };

    private onFinished = (confirmed: boolean): void => {
        if (confirmed) {
            dis.dispatch({ action: 'logout' });
        }
        // close dialog
        this.props.onFinished(confirmed);
    };

    private onSetRecoveryMethodClick = (): void => {
        if (this.state.backupInfo) {
            // A key backup exists for this account, but the creating device is not
            // verified, so restore the backup which will give us the keys from it and
            // allow us to trust it (ie. upload keys to it)
            Modal.createTrackedDialog(
                'Restore Backup', '', RestoreKeyBackupDialog, null, null,
                /* priority = */ false, /* static = */ true,
            );
        } else {
            Modal.createTrackedDialogAsync("Key Backup", "Key Backup",
                import("../../../async-components/views/dialogs/security/CreateKeyBackupDialog"),
                null, null, /* priority = */ false, /* static = */ true,
            );
        }

        // close dialog
        this.props.onFinished(true);
    };

    private onLogoutConfirm = (): void => {
        dis.dispatch({ action: 'logout' });

        // close dialog
        this.props.onFinished(true);
    };

    render() {
        if (this.state.shouldLoadBackupStatus) {
            const BaseDialog = sdk.getComponent('views.dialogs.BaseDialog');

            const description = <div>
                <p>{ _t(
                    "Encrypted messages are secured with end-to-end encryption. " +
                    "Only you and the recipient(s) have the keys to read these messages.",
                ) }</p>
                <p>{ _t("Back up your keys before signing out to avoid losing them.") }</p>
            </div>;

            let dialogContent;
            if (this.state.loading) {
                const Spinner = sdk.getComponent('views.elements.Spinner');

                dialogContent = <Spinner />;
            } else {
                const DialogButtons = sdk.getComponent('views.elements.DialogButtons');
                let setupButtonCaption;
                if (this.state.backupInfo) {
                    setupButtonCaption = _t("Connect this session to Key Backup");
                } else {
                    // if there's an error fetching the backup info, we'll just assume there's
                    // no backup for the purpose of the button caption
                    setupButtonCaption = _t("Start using Key Backup");
                }

                dialogContent = <div>
                    <div className="mx_Dialog_content" id='mx_Dialog_content'>
                        { description }
                    </div>
                    <DialogButtons primaryButton={setupButtonCaption}
                        hasCancel={false}
                        onPrimaryButtonClick={this.onSetRecoveryMethodClick}
                        focus={true}
                    >
                        <button onClick={this.onLogoutConfirm}>
                            { _t("I don't want my encrypted messages") }
                        </button>
                    </DialogButtons>
                    <details>
                        <summary>{ _t("Advanced") }</summary>
                        <p><button onClick={this.onExportE2eKeysClicked}>
                            { _t("Manually export keys") }
                        </button></p>
                    </details>
                </div>;
            }
            // Not quite a standard question dialog as the primary button cancels
            // the action and does something else instead, whilst non-default button
            // confirms the action.
            return (<BaseDialog
                title={_t("You'll lose access to your encrypted messages")}
                contentId='mx_Dialog_content'
                hasCancel={true}
                onFinished={this.onFinished}
            >
                { dialogContent }
            </BaseDialog>);
        } else {
            const QuestionDialog = sdk.getComponent('views.dialogs.QuestionDialog');
            return (<QuestionDialog
                hasCancelButton={true}
                title={_t("Sign out")}
                description={_t(
                    "Are you sure you want to sign out?",
                )}
                button={_t("Sign out")}
                onFinished={this.onFinished}
            />);
        }
    }
}
