import omit from 'lodash/omit';

const peer = (state, action) =>
{
	switch (action.type) 
	{
		case 'ADD_PEER':
			return action.payload.peer;

		case 'SET_PEER_DISPLAY_NAME':
			return { ...state, displayName: action.payload.displayName };

		case 'SET_PEER_VIDEO_IN_PROGRESS':
			return { ...state, peerVideoInProgress: action.payload.flag };

		case 'SET_PEER_AUDIO_IN_PROGRESS':
			return { ...state, peerAudioInProgress: action.payload.flag };

		case 'SET_PEER_SCREEN_IN_PROGRESS':
			return { ...state, peerScreenInProgress: action.payload.flag };
		
		case 'SET_PEER_RAISE_HAND_STATE':
			return { ...state, raiseHandState: action.payload.raiseHandState };
		
		case 'ADD_CONSUMER':
		{
			const consumers = [ ...state.consumers, action.payload.consumer.id ];

			return { ...state, consumers };
		}

		case 'REMOVE_CONSUMER':
		{
			const consumers = state.consumers.filter((consumer) => consumer !== action.payload.consumerId);

			return { ...state, consumers };
		}

		default:
			return state;
	}
};

const peers = (state = {}, action) =>
{
	switch (action.type)
	{
		case 'ADD_PEER':
		{
			return { ...state, [action.payload.peer.name]: peer(undefined, action) };
		}

		case 'REMOVE_PEER':
		{
			return omit(state, [ action.payload.peerName ]);
		}

		case 'SET_PEER_DISPLAY_NAME':
		case 'SET_PEER_VIDEO_IN_PROGRESS':
		case 'SET_PEER_AUDIO_IN_PROGRESS':
		case 'SET_PEER_SCREEN_IN_PROGRESS':
		case 'SET_PEER_RAISE_HAND_STATE':
		case 'ADD_CONSUMER':
		{
			const oldPeer = state[action.payload.peerName];

			if (!oldPeer) 
			{
				throw new Error('no Peer found');
			}

			return { ...state, [oldPeer.name]: peer(oldPeer, action) };
		}
		
		case 'REMOVE_CONSUMER':
		{
			const oldPeer = state[action.payload.peerName];

			// NOTE: This means that the Peer was closed before, so it's ok.
			if (!oldPeer)
				return state;

			return { ...state, [oldPeer.name]: peer(oldPeer, action) };
		}

		default:
			return state;
	}
};

export default peers;