/*
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 PropTypes from 'prop-types';
import { _t } from '../../../languageHandler';
import { MatrixClientPeg } from '../../../MatrixClientPeg';
import * as sdk from '../../../index';
import {
    SetupEncryptionStore,
    PHASE_INTRO,
    PHASE_BUSY,
    PHASE_DONE,
    PHASE_CONFIRM_SKIP,
    PHASE_FINISHED,
} from '../../../stores/SetupEncryptionStore';

export default class SetupEncryptionBody extends React.Component {
    static propTypes = {
        onFinished: PropTypes.func.isRequired,
    };

    constructor() {
        super();
        const store = SetupEncryptionStore.sharedInstance();
        store.on("update", this._onStoreUpdate);
        store.start();
        this.state = {
            phase: store.phase,
            // this serves dual purpose as the object for the request logic and
            // the presence of it indicating that we're in 'verify mode'.
            // Because of the latter, it lives in the state.
            verificationRequest: store.verificationRequest,
            backupInfo: store.backupInfo,
        };
    }

    _onStoreUpdate = () => {
        const store = SetupEncryptionStore.sharedInstance();
        if (store.phase === PHASE_FINISHED) {
            this.props.onFinished();
            return;
        }
        this.setState({
            phase: store.phase,
            verificationRequest: store.verificationRequest,
            backupInfo: store.backupInfo,
        });
    };

    componentWillUnmount() {
        const store = SetupEncryptionStore.sharedInstance();
        store.off("update", this._onStoreUpdate);
        store.stop();
    }

    _onUsePassphraseClick = async () => {
        const store = SetupEncryptionStore.sharedInstance();
        store.usePassPhrase();
    }

    onSkipClick = () => {
        const store = SetupEncryptionStore.sharedInstance();
        store.skip();
    }

    onSkipConfirmClick = () => {
        const store = SetupEncryptionStore.sharedInstance();
        store.skipConfirm();
    }

    onSkipBackClick = () => {
        const store = SetupEncryptionStore.sharedInstance();
        store.returnAfterSkip();
    }

    onDoneClick = () => {
        const store = SetupEncryptionStore.sharedInstance();
        store.done();
    }

    render() {
        const AccessibleButton = sdk.getComponent("elements.AccessibleButton");

        const {
            phase,
        } = this.state;

        if (this.state.verificationRequest) {
            const EncryptionPanel = sdk.getComponent("views.right_panel.EncryptionPanel");
            return <EncryptionPanel
                layout="dialog"
                verificationRequest={this.state.verificationRequest}
                onClose={this.props.onFinished}
                member={MatrixClientPeg.get().getUser(this.state.verificationRequest.otherUserId)}
            />;
        } else if (phase === PHASE_INTRO) {
            const ButtonPlaceholder = sdk.getComponent("elements.ButtonPlaceholder");
            return (
                <div>
                    <p>{_t(
                        "Use an existing session to verify this one, " +
                        "granting it access to encrypted messages.",
                    )}</p>
                    <p>{_t(
                        "If you can’t access one, <button>use your recovery key or passphrase.</button>",
                    {}, {
                        button: sub => <AccessibleButton element="span"
                            className="mx_linkButton"
                            onClick={this._onUsePassphraseClick}
                        >
                            {sub}
                        </AccessibleButton>,
                    })}</p>
                    <div className="mx_CompleteSecurity_actionRow">
                        <AccessibleButton
                            kind="danger"
                            onClick={this.onSkipClick}
                        >
                            {_t("Skip")}
                        </AccessibleButton>
                        <ButtonPlaceholder>{_t("Use your other device to continue…")}</ButtonPlaceholder>
                    </div>
                </div>
            );
        } else if (phase === PHASE_DONE) {
            let message;
            if (this.state.backupInfo) {
                message = <p>{_t(
                    "Your new session is now verified. It has access to your " +
                    "encrypted messages, and other users will see it as trusted.",
                )}</p>;
            } else {
                message = <p>{_t(
                    "Your new session is now verified. Other users will see it as trusted.",
                )}</p>;
            }
            return (
                <div>
                    <div className="mx_CompleteSecurity_heroIcon mx_E2EIcon_verified"></div>
                    {message}
                    <div className="mx_CompleteSecurity_actionRow">
                        <AccessibleButton
                            kind="primary"
                            onClick={this.onDoneClick}
                        >
                            {_t("Done")}
                        </AccessibleButton>
                    </div>
                </div>
            );
        } else if (phase === PHASE_CONFIRM_SKIP) {
            return (
                <div>
                    <p>{_t(
                        "Without completing security on this session, it won’t have " +
                        "access to encrypted messages.",
                    )}</p>
                    <div className="mx_CompleteSecurity_actionRow">
                        <AccessibleButton
                            className="warning"
                            kind="secondary"
                            onClick={this.onSkipConfirmClick}
                        >
                            {_t("Skip")}
                        </AccessibleButton>
                        <AccessibleButton
                            kind="danger"
                            onClick={this.onSkipBackClick}
                        >
                            {_t("Go Back")}
                        </AccessibleButton>
                    </div>
                </div>
            );
        } else if (phase === PHASE_BUSY) {
            const Spinner = sdk.getComponent('views.elements.Spinner');
            return <Spinner />;
        } else {
            console.log(`SetupEncryptionBody: Unknown phase ${phase}`);
        }
    }
}