/*
Copyright 2023 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 { type AudioConcealment } from "../statsReport.ts";
import { type TrackId } from "./mediaTrackHandler.ts";

export interface PacketLoss {
    packetsTotal: number;
    packetsLost: number;
    isDownloadStream: boolean;
}

export interface Bitrate {
    /**
     * bytes per second
     */
    download: number;
    /**
     * bytes per second
     */
    upload: number;
}
export interface ConcealedAudio {
    /**
     * duration in ms
     */
    duration: number;

    ratio: number;
}
export interface Resolution {
    width: number;
    height: number;
}

export type TrackStatsType = "local" | "remote";

export class MediaTrackStats {
    private loss: PacketLoss = { packetsTotal: 0, packetsLost: 0, isDownloadStream: false };
    private bitrate: Bitrate = { download: 0, upload: 0 };
    private resolution: Resolution = { width: -1, height: -1 };
    private audioConcealment: AudioConcealment = { concealedAudio: 0, totalAudioDuration: 0 };
    private framerate = 0;
    private jitter = 0;
    private codec = "";
    private isAlive = true;
    private isMuted = false;
    private isEnabled = true;

    public constructor(
        public readonly trackId: TrackId,
        public readonly type: TrackStatsType,
        public readonly kind: "audio" | "video",
    ) {}

    public getType(): TrackStatsType {
        return this.type;
    }

    public setLoss(loss: PacketLoss): void {
        this.loss = loss;
    }

    public getLoss(): PacketLoss {
        return this.loss;
    }

    public setResolution(resolution: Resolution): void {
        this.resolution = resolution;
    }

    public getResolution(): Resolution {
        return this.resolution;
    }

    public setFramerate(framerate: number): void {
        this.framerate = framerate;
    }

    public getFramerate(): number {
        return this.framerate;
    }

    public setBitrate(bitrate: Bitrate): void {
        this.bitrate = bitrate;
    }

    public getBitrate(): Bitrate {
        return this.bitrate;
    }

    public setCodec(codecShortType: string): boolean {
        this.codec = codecShortType;
        return true;
    }

    public getCodec(): string {
        return this.codec;
    }

    public resetBitrate(): void {
        this.bitrate = { download: 0, upload: 0 };
    }

    public set alive(isAlive: boolean) {
        this.isAlive = isAlive;
    }

    /**
     * A MediaTrackState is alive if the corresponding MediaStreamTrack track bound to a transceiver and the
     * MediaStreamTrack is in state MediaStreamTrack.readyState === live
     */
    public get alive(): boolean {
        return this.isAlive;
    }

    public set muted(isMuted: boolean) {
        this.isMuted = isMuted;
    }

    /**
     * A MediaTrackState.isMuted corresponding to MediaStreamTrack.muted.
     * But these values only match if MediaTrackState.isAlive.
     */
    public get muted(): boolean {
        return this.isMuted;
    }

    public set enabled(isEnabled: boolean) {
        this.isEnabled = isEnabled;
    }

    /**
     * A MediaTrackState.isEnabled corresponding to MediaStreamTrack.enabled.
     * But these values only match if MediaTrackState.isAlive.
     */
    public get enabled(): boolean {
        return this.isEnabled;
    }

    public setJitter(jitter: number): void {
        this.jitter = jitter;
    }

    /**
     * Jitter in milliseconds
     */
    public getJitter(): number {
        return this.jitter;
    }

    /**
     * Audio concealment ration (conceled duration / total duration)
     */
    public setAudioConcealment(concealedAudioDuration: number, totalAudioDuration: number): void {
        this.audioConcealment.concealedAudio = concealedAudioDuration;
        this.audioConcealment.totalAudioDuration = totalAudioDuration;
    }

    public getAudioConcealment(): AudioConcealment {
        return this.audioConcealment;
    }
}