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const createOneToOneParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    const instance = {
        ...
        removeAudioTrack: function (track) {
            if (!this.audioTracks.delete(track.mid)) {
                return
            }

            participantView.removeAudioTrack(track);
            const remoteTrack = this.remoteAudioTracks.get(track.mid);
            if (remoteTrack) {
                this.remoteAudioTracks.delete(track.mid);
                remoteTrack.dispose();
            }
        },
        ...
    };
    ...
    return instance;
}

const createOneToOneParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    const instance = {
        ...
        requestVideoTrack: async function (track, remoteTrack) {
            return new Promise((resolve, reject) => {
                if (!remoteTrack || !track) {
                    reject(new Error("Remote and local track must be defined"));
                    return;
                }
                const self = this;
                remoteTrack.demandTrack(track.id).then(() => {
                    if (!self.videoTracks.get(track.mid)) {
                        reject(new Error("Video track already removed from model"));
                        return;
                    }
                    let abrManager = self.abrManagers.get(track.id);

                    if (abrManager) {
                        abrManager.clearQualityState();
                    } else if (abrFactory) {
                        abrManager = abrFactory.createAbrManager();
                        self.abrManagers.set(track.id, abrManager);
                    }

                    if (abrManager) {
                        abrManager.setTrack(remoteTrack);
                        abrManager.stop();
                        if (track.quality.length > 0) {
                            participantView.addQuality(track, "Auto", true, async () => {
                                const manager = self.abrManagers.get(track.id);
                                if (!manager) {
                                    return;
                                }
                                manager.start();
                                manager.setAuto();
                                participantView.pickQuality(track, "Auto");
                            });
                            if (displayOptions.autoAbr) {
                                abrManager.setAuto();
                                abrManager.start();
                                participantView.pickQuality(track, "Auto");
                            }
                        }
                    }
                    for (const qualityDescriptor of track.quality) {
                        if (abrManager) {
                            abrManager.addQuality(qualityDescriptor.quality);
                            abrManager.setQualityAvailable(qualityDescriptor.quality, qualityDescriptor.available);
                        }
                        if (displayOptions.quality) {
                            participantView.addQuality(track, qualityDescriptor.quality, qualityDescriptor.available, async () => {
                                const manager = self.abrManagers.get(track.id);
                                if (manager) {
                                    manager.setManual();
                                    manager.setQuality(qualityDescriptor.quality);
                                }
                                return self.pickQuality(track, qualityDescriptor.quality);
                            });
                        }
                    }
                    self.remoteVideoTracks.delete(track.mid);
                    self.remoteVideoTracks.set(track.mid, remoteTrack);
                    resolve();
                }, (ex) => {
                    reject(ex);
                });
            });
        },
        ...
    };
    ...
    return instance;
}

const createOneToOneParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    const instance = {
        ...
        updateQualityInfo: function (remoteTracks) {
            for (const remoteTrackQuality of remoteTracks) {
                const track = this.videoTracks.get(remoteTrackQuality.mid);
                if (!track) {
                    continue;
                }
                if (!this.remoteVideoTracks.get(track.mid)) {
                    // update model and return, view not changed
                    for (const remoteQualityInfo of remoteTrackQuality.quality) {
                        const quality = track.quality.find((q) => q.quality === remoteQualityInfo.quality);
                        if (quality) {
                            quality.available = remoteQualityInfo.available;
                        } else {
                            track.quality.push(remoteQualityInfo);
                        }
                    }
                    return;
                }
                let abrManager = this.abrManagers.get(track.id);
                if (abrManager && track.quality.length === 0 && remoteTrackQuality.quality.length > 0) {
                    const self = this;
                    participantView.addQuality(track, "Auto", true, async () => {
                        const manager = self.abrManagers.get(track.id);
                        if (!manager) {
                            return;
                        }
                        manager.start();
                        manager.setAuto();
                        participantView.pickQuality(track, "Auto");
                    })
                    if (displayOptions.autoAbr) {
                        abrManager.setAuto();
                        abrManager.start();
                        participantView.pickQuality(track, "Auto");
                    }
                }
                for (const remoteQualityInfo of remoteTrackQuality.quality) {
                    const localQuality = track.quality.find((q) => q.quality === remoteQualityInfo.quality);
                    if (localQuality) {
                        localQuality.available = remoteQualityInfo.available;
                        if (abrManager) {
                            abrManager.setQualityAvailable(remoteQualityInfo.quality, remoteQualityInfo.available);
                        }
                        if (displayOptions.quality) {
                            participantView.updateQuality(track, localQuality.quality, localQuality.available);
                        }
                    } else {
                        track.quality.push(remoteQualityInfo);
                        if (abrManager) {
                            abrManager.addQuality(remoteQualityInfo.quality);
                            abrManager.setQualityAvailable(remoteQualityInfo.quality, remoteQualityInfo.available)
                        }
                        if (displayOptions.quality) {
                            const self = this;
                            participantView.addQuality(track, remoteQualityInfo.quality, remoteQualityInfo.available, async () => {
                                const manager = self.abrManagers.get(track.id);
                                if (manager) {
                                    manager.setManual();
                                    manager.setQuality(remoteQualityInfo.quality);
                                }
                                return self.pickQuality(track, remoteQualityInfo.quality);
                            });
                        }
                    }
                }
            }

        },
        ...
    };
    ...
    return instance;
}

const createOneToOneParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    const instance = {
        ...
        pickQuality: async function (track, qualityName) {
            let remoteVideoTrack = this.remoteVideoTracks.get(track.mid);
            if (remoteVideoTrack) {
                return remoteVideoTrack.setPreferredQuality(qualityName).then(() => {
                    participantView.pickQuality(track, qualityName);
                });
            }
        },
        ...
    };
    ...
    return instance;
}

const createOneToOneParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    const instance = {
        ...
        muteVideo: async function (track) {
            const remoteTrack = this.remoteVideoTracks.get(track.mid);
            if (remoteTrack) {
                return remoteTrack.mute();
            } else {
                return new Promise((resolve, reject) => {
                    reject(new Error("Remote track not defined"));
                });
            }
        },
        ...
    };
    ...
    return instance;
}

const createOneToOneParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    const instance = {
        ...
        unmuteVideo: async function (track) {
            const remoteTrack = this.remoteVideoTracks.get(track.mid);
            if (remoteTrack) {
                return remoteTrack.unmute();
            } else {
                return new Promise((resolve, reject) => {
                    reject(new Error("Remote track not defined"));
                });
            }
        }
    };
    ...
    return instance;
}

const createOneToOneParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    const instance = {
        ...
        dispose: async function () {
            this.disposed = true;
            participantView.dispose();
            this.remoteVideoTracks.forEach((track, id) => {
                track.dispose();
            })
            this.remoteVideoTracks.clear();

            this.remoteAudioTracks.forEach((track, id) => {
                track.dispose();
            })
            this.remoteAudioTracks.clear();

            this.abrManagers.forEach((abrManager, id) => {
                abrManager.stop();
            })
            this.abrManagers.clear();

        },
    };
    ...
    return instance;
}

const createOneToManyParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    ...
    const instance = {
        userId: userId,
        nickname: nickname,
        videoEnabled: false,
        currentTrack: null,
        remoteVideoTrack: null,
        remoteAudioTracks: new Map(),
        audioTracks: new Map(),
        videoTracks: new Map(),
        abr: null,
        disposed: false,
        dispose: async function () {
            ...
        },
        addVideoTrack: function (track) {
            ...
        },
        removeVideoTrack: function (track) {
            ...
        },
        addAudioTrack: function (track) {
            ...
        },
        removeAudioTrack: function (track) {
            ...
        },
        setUserId: function (userId) {
            ...
        },
        setNickname: function (nickname) {
            ...
        },
        updateQualityInfo: function (remoteTracks) {
            ...
        },
        requestVideoTrack: async function (track, remoteTrack) {
            ...
        },
        pickQuality: async function (track, qualityName) {
            ...
        },
        muteVideo: async function (track) {
            ...
        },
        unmuteVideo: async function (track) {
            ...
        }
    };
    instance.setUserId(userId);
    instance.setNickname(nickname);
    if (abrFactory) {
        instance.abr = abrFactory.createAbrManager();
    }
    return instance;
}

const createOneToManyParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    ...
    const instance = {
        ...
        addVideoTrack: function (track) {
            this.videoTracks.set(track.mid, track);
            if (!track.quality) {
                track.quality = [];
            }
            const self = this;
            participantView.addVideoTrack(track, () => {
                if (self.disposed) {
                    return new Promise((resolve, reject) => {
                        reject(new Error("Model disposed"));
                    });
                }

                if (self.remoteVideoTrack) {
                    return new Promise((resolve, reject) => {
                        self.requestVideoTrack(track, self.remoteVideoTrack).then(() => {
                            resolve();
                        }, (ex) => {
                            reject(ex);
                        });
                    });
                } else {
                    return new Promise((resolve, reject) => {
                        reject(new Error("Remote track is null"));
                        requestTrackAndPick(self, track);
                    });
                }
            });
            requestTrackAndPick(this, track);
        },
        ...
    };
    ...
    return instance;
}

const createOneToManyParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    ...
    const instance = {
        ...
        removeVideoTrack: function (track) {
            this.videoTracks.delete(track.mid);
            participantView.removeVideoTrack(track);
            if (this.currentTrack && this.currentTrack.mid === track.mid) {
                repickTrack(this, track);
            }
        },
        ...
    };
    ...
    return instance;
}

const createOneToManyParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    ...
    const instance = {
        ...
        addAudioTrack: async function (track) {
            this.audioTracks.set(track.mid, track);
            const self = this;
            remoteTrackFactory.getAudioTrack().then((remoteTrack) => {
                if (!remoteTrack) {
                    return;
                }
                if (self.disposed || !self.audioTracks.get(track.mid)) {
                    remoteTrack.dispose();
                    return;
                }
                this.remoteAudioTracks.set(track.mid, remoteTrack);
                remoteTrack.demandTrack(track.id).then(() => {
                    if (!self.audioTracks.get(track.mid)) {
                        remoteTrack.dispose();
                        self.remoteAudioTracks.delete(track.mid);
                        return;
                    }
                    participantView.addAudioTrack(track, remoteTrack.track, displayOptions.showAudio);
                }, (ex) => {
                    console.log("Failed demand track " + ex);
                    remoteTrack.dispose();
                    self.remoteAudioTracks.delete(track.mid);
                });
            }, (ex) => {
                console.log("Failed to get audio track " + ex);
            });

        },
        ...
    };
    ...
    return instance;
}

const createOneToManyParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    ...
    const instance = {
        ...
        removeAudioTrack: function (track) {
            if (!this.audioTracks.delete(track.mid)) {
                return
            }

            participantView.removeAudioTrack(track);
            const remoteTrack = this.remoteAudioTracks.get(track.mid);
            if (remoteTrack) {
                this.remoteAudioTracks.delete(track.mid);
                remoteTrack.dispose();
            }

        },
        ...
    };
    ...
    return instance;
}

const createOneToManyParticipantModel = function (userId, nickname, participantView, remoteTrackFactory, abrFactory, displayOptions) {
    ...
    const instance = {
        ...
        requestVideoTrack: async function (track, remoteTrack) {
            return new Promise((resolve, reject) => {
                if (!remoteTrack || !track) {
                    reject(new Error("Remote and local track must be defined"));
                    return;
                }
                const self = this;
                remoteTrack.demandTrack(track.id).then(() => {
                    // channels reordering case, must be removed after channels unification
                    if (!self.videoTracks.get(track.mid)) {
                        reject(new Error("Video track already removed from model"));
                        return;
                    }
                    self.currentTrack = track;
                    participantView.clearQualityState(track);
                    if (self.abr) {
                        self.abr.stop();
                        self.abr.clearQualityState();
                        self.abr.setTrack(remoteTrack);

                        if (track.quality.length > 0) {
                            participantView.addQuality(track, "Auto", true, async () => {
                                if (!self.abr) {
                                    return;
                                }
                                self.abr.start();
                                self.abr.setAuto();
                                participantView.pickQuality(track, "Auto");
                            })
                        }
                        if (displayOptions.autoAbr) {
                            self.abr.setAuto();
                            self.abr.start();
                            participantView.pickQuality(track, "Auto");
                        }
                    }
                    for (const qualityDescriptor of track.quality) {
                        if (self.abr) {
                            self.abr.addQuality(qualityDescriptor.quality);
                            self.abr.setQualityAvailable(qualityDescriptor.quality, qualityDescriptor.available);
                        }
                        if (displayOptions.quality) {
                            participantView.addQuality(track, qualityDescriptor.quality, qualityDescriptor.available, async () => {
                                if (self.abr) {
                                    self.abr.setManual();
                                    self.abr.setQuality(qualityDescriptor.quality);
                                }
                                return self.pickQuality(track, qualityDescriptor.quality);
                            });
                        }
                    }
                    resolve();
                }, (ex) => reject(ex));
            });
        },
        ...
    };
    ...
    return instance;
}