/*
Copyright 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, { ReactNode } from "react";

import { _t } from "../../../../../languageHandler";
import MediaDeviceHandler, { IMediaDevices, MediaDeviceKindEnum } from "../../../../../MediaDeviceHandler";
import Field from "../../../elements/Field";
import AccessibleButton from "../../../elements/AccessibleButton";
import { MatrixClientPeg } from "../../../../../MatrixClientPeg";
import { SettingLevel } from "../../../../../settings/SettingLevel";
import SettingsFlag from "../../../elements/SettingsFlag";
import LabelledToggleSwitch from "../../../elements/LabelledToggleSwitch";
import { requestMediaPermissions } from "../../../../../utils/media/requestMediaPermissions";

interface IState {
    mediaDevices: IMediaDevices | null;
    [MediaDeviceKindEnum.AudioOutput]: string | null;
    [MediaDeviceKindEnum.AudioInput]: string | null;
    [MediaDeviceKindEnum.VideoInput]: string | null;
    audioAutoGainControl: boolean;
    audioEchoCancellation: boolean;
    audioNoiseSuppression: boolean;
}

export default class VoiceUserSettingsTab extends React.Component<{}, IState> {
    public constructor(props: {}) {
        super(props);

        this.state = {
            mediaDevices: null,
            [MediaDeviceKindEnum.AudioOutput]: null,
            [MediaDeviceKindEnum.AudioInput]: null,
            [MediaDeviceKindEnum.VideoInput]: null,
            audioAutoGainControl: MediaDeviceHandler.getAudioAutoGainControl(),
            audioEchoCancellation: MediaDeviceHandler.getAudioEchoCancellation(),
            audioNoiseSuppression: MediaDeviceHandler.getAudioNoiseSuppression(),
        };
    }

    public async componentDidMount(): Promise<void> {
        const canSeeDeviceLabels = await MediaDeviceHandler.hasAnyLabeledDevices();
        if (canSeeDeviceLabels) {
            this.refreshMediaDevices();
        }
    }

    private refreshMediaDevices = async (stream?: MediaStream): Promise<void> => {
        this.setState({
            mediaDevices: (await MediaDeviceHandler.getDevices()) ?? null,
            [MediaDeviceKindEnum.AudioOutput]: MediaDeviceHandler.getAudioOutput(),
            [MediaDeviceKindEnum.AudioInput]: MediaDeviceHandler.getAudioInput(),
            [MediaDeviceKindEnum.VideoInput]: MediaDeviceHandler.getVideoInput(),
        });
        if (stream) {
            // kill stream (after we've enumerated the devices, otherwise we'd get empty labels again)
            // so that we don't leave it lingering around with webcam enabled etc
            // as here we called gUM to ask user for permission to their device names only
            stream.getTracks().forEach((track) => track.stop());
        }
    };

    private requestMediaPermissions = async (): Promise<void> => {
        const stream = await requestMediaPermissions();
        if (stream) {
            this.refreshMediaDevices(stream);
        }
    };

    private setDevice = (deviceId: string, kind: MediaDeviceKindEnum): void => {
        MediaDeviceHandler.instance.setDevice(deviceId, kind);
        this.setState<any>({ [kind]: deviceId });
    };

    private changeWebRtcMethod = (p2p: boolean): void => {
        MatrixClientPeg.get().setForceTURN(!p2p);
    };

    private changeFallbackICEServerAllowed = (allow: boolean): void => {
        MatrixClientPeg.get().setFallbackICEServerAllowed(allow);
    };

    private renderDeviceOptions(devices: Array<MediaDeviceInfo>, category: MediaDeviceKindEnum): Array<JSX.Element> {
        return devices.map((d) => {
            return (
                <option key={`${category}-${d.deviceId}`} value={d.deviceId}>
                    {d.label}
                </option>
            );
        });
    }

    private renderDropdown(kind: MediaDeviceKindEnum, label: string): ReactNode {
        const devices = this.state.mediaDevices?.[kind].slice(0);
        if (!devices?.length) return null;

        const defaultDevice = MediaDeviceHandler.getDefaultDevice(devices);
        return (
            <Field
                element="select"
                label={label}
                value={this.state[kind] || defaultDevice}
                onChange={(e) => this.setDevice(e.target.value, kind)}
            >
                {this.renderDeviceOptions(devices, kind)}
            </Field>
        );
    }

    public render(): ReactNode {
        let requestButton: ReactNode | undefined;
        let speakerDropdown: ReactNode | undefined;
        let microphoneDropdown: ReactNode | undefined;
        let webcamDropdown: ReactNode | undefined;
        if (!this.state.mediaDevices) {
            requestButton = (
                <div className="mx_VoiceUserSettingsTab_missingMediaPermissions">
                    <p>{_t("Missing media permissions, click the button below to request.")}</p>
                    <AccessibleButton onClick={this.requestMediaPermissions} kind="primary">
                        {_t("Request media permissions")}
                    </AccessibleButton>
                </div>
            );
        } else if (this.state.mediaDevices) {
            speakerDropdown = this.renderDropdown(MediaDeviceKindEnum.AudioOutput, _t("Audio Output")) || (
                <p>{_t("No Audio Outputs detected")}</p>
            );
            microphoneDropdown = this.renderDropdown(MediaDeviceKindEnum.AudioInput, _t("Microphone")) || (
                <p>{_t("No Microphones detected")}</p>
            );
            webcamDropdown = this.renderDropdown(MediaDeviceKindEnum.VideoInput, _t("Camera")) || (
                <p>{_t("No Webcams detected")}</p>
            );
        }

        return (
            <div className="mx_SettingsTab mx_VoiceUserSettingsTab">
                <div className="mx_SettingsTab_heading">{_t("Voice & Video")}</div>
                {requestButton}
                <div className="mx_SettingsTab_section">
                    <span className="mx_SettingsTab_subheading">{_t("Voice settings")}</span>
                    {speakerDropdown}
                    {microphoneDropdown}
                    <LabelledToggleSwitch
                        value={this.state.audioAutoGainControl}
                        onChange={async (v): Promise<void> => {
                            await MediaDeviceHandler.setAudioAutoGainControl(v);
                            this.setState({ audioAutoGainControl: MediaDeviceHandler.getAudioAutoGainControl() });
                        }}
                        label={_t("Automatically adjust the microphone volume")}
                        data-testid="voice-auto-gain"
                    />
                </div>
                <div className="mx_SettingsTab_section">
                    <span className="mx_SettingsTab_subheading">{_t("Video settings")}</span>
                    {webcamDropdown}
                    <SettingsFlag name="VideoView.flipVideoHorizontally" level={SettingLevel.ACCOUNT} />
                </div>

                <div className="mx_SettingsTab_heading">{_t("Advanced")}</div>
                <div className="mx_SettingsTab_section">
                    <span className="mx_SettingsTab_subheading">{_t("Voice processing")}</span>
                    <div className="mx_SettingsTab_section">
                        <LabelledToggleSwitch
                            value={this.state.audioNoiseSuppression}
                            onChange={async (v): Promise<void> => {
                                await MediaDeviceHandler.setAudioNoiseSuppression(v);
                                this.setState({ audioNoiseSuppression: MediaDeviceHandler.getAudioNoiseSuppression() });
                            }}
                            label={_t("Noise suppression")}
                            data-testid="voice-noise-suppression"
                        />
                        <LabelledToggleSwitch
                            value={this.state.audioEchoCancellation}
                            onChange={async (v): Promise<void> => {
                                await MediaDeviceHandler.setAudioEchoCancellation(v);
                                this.setState({ audioEchoCancellation: MediaDeviceHandler.getAudioEchoCancellation() });
                            }}
                            label={_t("Echo cancellation")}
                            data-testid="voice-echo-cancellation"
                        />
                    </div>
                    <div className="mx_SettingsTab_section">
                        <span className="mx_SettingsTab_subheading">{_t("Connection")}</span>
                        <SettingsFlag
                            name="webRtcAllowPeerToPeer"
                            level={SettingLevel.DEVICE}
                            onChange={this.changeWebRtcMethod}
                        />
                        <SettingsFlag
                            name="fallbackICEServerAllowed"
                            level={SettingLevel.DEVICE}
                            onChange={this.changeFallbackICEServerAllowed}
                        />
                    </div>
                </div>
            </div>
        );
    }
}