/*
Copyright 2019 New Vector Ltd

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 {MatrixClientPeg} from '../../../MatrixClientPeg';
import * as sdk from '../../../index';
import { _t } from '../../../languageHandler';

const PHASE_START = 0;
const PHASE_SHOW_SAS = 1;
const PHASE_WAIT_FOR_PARTNER_TO_CONFIRM = 2;
const PHASE_VERIFIED = 3;
const PHASE_CANCELLED = 4;

export default class IncomingSasDialog extends React.Component {
    static propTypes = {
        verifier: PropTypes.object.isRequired,
    };

    constructor(props) {
        super(props);

        let phase = PHASE_START;
        if (this.props.verifier.cancelled) {
            console.log("Verifier was cancelled in the background.");
            phase = PHASE_CANCELLED;
        }

        this._showSasEvent = null;
        this.state = {
            phase: phase,
            sasVerified: false,
            opponentProfile: null,
            opponentProfileError: null,
        };
        this.props.verifier.on('show_sas', this._onVerifierShowSas);
        this.props.verifier.on('cancel', this._onVerifierCancel);
        this._fetchOpponentProfile();
    }

    componentWillUnmount() {
        if (this.state.phase !== PHASE_CANCELLED && this.state.phase !== PHASE_VERIFIED) {
            this.props.verifier.cancel('User cancel');
        }
        this.props.verifier.removeListener('show_sas', this._onVerifierShowSas);
    }

    async _fetchOpponentProfile() {
        try {
            const prof = await MatrixClientPeg.get().getProfileInfo(
                this.props.verifier.userId,
            );
            this.setState({
                opponentProfile: prof,
            });
        } catch (e) {
            this.setState({
                opponentProfileError: e,
            });
        }
    }

    _onFinished = () => {
        this.props.onFinished(this.state.phase === PHASE_VERIFIED);
    }

    _onCancelClick = () => {
        this.props.onFinished(this.state.phase === PHASE_VERIFIED);
    }

    _onContinueClick = () => {
        this.setState({phase: PHASE_WAIT_FOR_PARTNER_TO_CONFIRM});
        this.props.verifier.verify().then(() => {
            this.setState({phase: PHASE_VERIFIED});
        }).catch((e) => {
            console.log("Verification failed", e);
        });
    }

    _onVerifierShowSas = (e) => {
        this._showSasEvent = e;
        this.setState({
            phase: PHASE_SHOW_SAS,
            sas: e.sas,
        });
    }

    _onVerifierCancel = (e) => {
        this.setState({
            phase: PHASE_CANCELLED,
        });
    }

    _onSasMatchesClick = () => {
        this._showSasEvent.confirm();
        this.setState({
            phase: PHASE_WAIT_FOR_PARTNER_TO_CONFIRM,
        });
    }

    _onVerifiedDoneClick = () => {
        this.props.onFinished(true);
    }

    _renderPhaseStart() {
        const DialogButtons = sdk.getComponent('views.elements.DialogButtons');
        const Spinner = sdk.getComponent("views.elements.Spinner");
        const BaseAvatar = sdk.getComponent("avatars.BaseAvatar");

        const isSelf = this.props.verifier.userId == MatrixClientPeg.get().getUserId();

        let profile;
        if (this.state.opponentProfile) {
            profile = <div className="mx_IncomingSasDialog_opponentProfile">
                <BaseAvatar name={this.state.opponentProfile.displayname}
                    idName={this.props.verifier.userId}
                    url={MatrixClientPeg.get().mxcUrlToHttp(
                        this.state.opponentProfile.avatar_url,
                        Math.floor(48 * window.devicePixelRatio),
                        Math.floor(48 * window.devicePixelRatio),
                        'crop',
                    )}
                    width={48} height={48} resizeMethod='crop'
                />
                <h2>{this.state.opponentProfile.displayname}</h2>
            </div>;
        } else if (this.state.opponentProfileError) {
            profile = <div>
                <BaseAvatar name={this.props.verifier.userId.slice(1)}
                    idName={this.props.verifier.userId}
                    width={48} height={48}
                />
                <h2>{this.props.verifier.userId}</h2>
            </div>;
        } else {
            profile = <Spinner />;
        }

        const userDetailText = [
            <p>{_t(
                "Verify this user to mark them as trusted. " +
                "Trusting users gives you extra peace of mind when using " +
                "end-to-end encrypted messages.",
            )}</p>,
            <p>{_t(
                // NB. Below wording adjusted to singular 'session' until we have
                // cross-signing
                "Verifying this user will mark their session as trusted, and " +
                "also mark your session as trusted to them.",
            )}</p>
        ];

        const selfDetailText = [
            <p>{_t(
                "Verify this device to mark it as trusted. " +
                "Trusting this device gives you and other users extra peace of mind when using " +
                "end-to-end encrypted messages.",
            )}</p>,
            <p>{_t(
                "Verifying this device will mark it as trusted, and users who have verified with " +
                "you will trust this device.",
            )}</p>
        ];

        return (
            <div>
                {profile}
                {isSelf ? selfDetailText : userDetailText}
                <DialogButtons
                    primaryButton={_t('Continue')}
                    hasCancel={true}
                    onPrimaryButtonClick={this._onContinueClick}
                    onCancel={this._onCancelClick}
                />
            </div>
        );
    }

    _renderPhaseShowSas() {
        const VerificationShowSas = sdk.getComponent('views.verification.VerificationShowSas');
        return <VerificationShowSas
            sas={this._showSasEvent.sas}
            onCancel={this._onCancelClick}
            onDone={this._onSasMatchesClick}
            isSelf={this.props.verifier.userId == MatrixClientPeg.get().getUserId()}
        />;
    }

    _renderPhaseWaitForPartnerToConfirm() {
        const Spinner = sdk.getComponent("views.elements.Spinner");

        return (
            <div>
                <Spinner />
                <p>{_t("Waiting for partner to confirm...")}</p>
            </div>
        );
    }

    _renderPhaseVerified() {
        const VerificationComplete = sdk.getComponent('views.verification.VerificationComplete');
        return <VerificationComplete onDone={this._onVerifiedDoneClick} />;
    }

    _renderPhaseCancelled() {
        const VerificationCancelled = sdk.getComponent('views.verification.VerificationCancelled');
        return <VerificationCancelled onDone={this._onCancelClick} />;
    }

    render() {
        let body;
        switch (this.state.phase) {
            case PHASE_START:
                body = this._renderPhaseStart();
                break;
            case PHASE_SHOW_SAS:
                body = this._renderPhaseShowSas();
                break;
            case PHASE_WAIT_FOR_PARTNER_TO_CONFIRM:
                body = this._renderPhaseWaitForPartnerToConfirm();
                break;
            case PHASE_VERIFIED:
                body = this._renderPhaseVerified();
                break;
            case PHASE_CANCELLED:
                body = this._renderPhaseCancelled();
                break;
        }

        const BaseDialog = sdk.getComponent("dialogs.BaseDialog");
        return (
            <BaseDialog
                title={_t("Incoming Verification Request")}
                onFinished={this._onFinished}
                fixedWidth={false}
            >
                {body}
            </BaseDialog>
        );
    }
}