import {
    DOMINANT_SPEAKER_CHANGED,
    PARTICIPANT_DISPLAY_NAME_CHANGED,
    PARTICIPANT_ID_CHANGED,
    PARTICIPANT_JOINED,
    PARTICIPANT_LEFT,
    PARTICIPANT_UPDATED,
    PIN_PARTICIPANT
} from './actionTypes';
import { MAX_DISPLAY_NAME_LENGTH } from './constants';
import { getLocalParticipant } from './functions';

/**
 * Create an action for when dominant speaker changes.
 *
 * @param {string} id - Participant's ID.
 * @returns {{
 *     type: DOMINANT_SPEAKER_CHANGED,
 *     participant: {
 *         id: string
 *     }
 * }}
 */
export function dominantSpeakerChanged(id) {
    return {
        type: DOMINANT_SPEAKER_CHANGED,
        participant: {
            id
        }
    };
}

/**
 * Action to signal that the ID of local participant has changed. It happens
 * when the local participant joins a new conference or leaves an existing
 * conference.
 *
 * @param {string} id - New ID for local participant.
 * @returns {Function}
 */
export function localParticipantIdChanged(id) {
    return (dispatch, getState) => {
        const participant = getLocalParticipant(getState);

        if (participant) {
            return dispatch({
                type: PARTICIPANT_ID_CHANGED,
                newValue: id,
                oldValue: participant.id
            });
        }
    };
}

/**
 * Action to signal that a local participant has joined.
 *
 * @param {Participant} participant={} - Information about participant.
 * @returns {{
 *     type: PARTICIPANT_JOINED,
 *     participant: Participant
 * }}
 */
export function localParticipantJoined(participant = {}) {
    return participantJoined({
        ...participant,
        local: true
    });
}

/**
 * Action to signal the role of the local participant has changed. It can happen
 * when the participant has joined a conference, even before a non-default local
 * id has been set, or after a moderator leaves.
 *
 * @param {string} role - The new role of the local participant.
 * @returns {Function}
 */
export function localParticipantRoleChanged(role) {
    return (dispatch, getState) => {
        const participant = getLocalParticipant(getState);

        if (participant) {
            return dispatch(participantRoleChanged(participant.id, role));
        }
    };
}

/**
 * Action to update a participant's connection status.
 *
 * @param {string} id - Participant's ID.
 * @param {string} connectionStatus - The new connection status of the
 * participant.
 * @returns {{
 *     type: PARTICIPANT_UPDATED,
 *     participant: {
 *         connectionStatus: string,
 *         id: string
 *     }
 * }}
 */
export function participantConnectionStatusChanged(id, connectionStatus) {
    return {
        type: PARTICIPANT_UPDATED,
        participant: {
            connectionStatus,
            id
        }
    };
}

/**
 * Action to remove a local participant.
 *
 * @returns {Function}
 */
export function localParticipantLeft() {
    return (dispatch, getState) => {
        const participant = getLocalParticipant(getState);

        if (participant) {
            return dispatch(participantLeft(participant.id));
        }
    };
}

/**
 * Action to signal that a participant's display name has changed.
 *
 * @param {string} id - The id of the participant being changed.
 * @param {string} displayName - The new display name.
 * @returns {{
 *     type: PARTICIPANT_DISPLAY_NAME_CHANGED,
 *     id: string,
 *     name: string
 * }}
 */
export function participantDisplayNameChanged(id, displayName = '') {
    // FIXME Do not use this action over participantUpdated. This action exists
    // as a a bridge for local name updates. Once other components responsible
    // for updating the local user's display name are in react/redux, this
    // action should be replaceable with the participantUpdated action.
    return {
        type: PARTICIPANT_DISPLAY_NAME_CHANGED,
        id,
        name: displayName.substr(0, MAX_DISPLAY_NAME_LENGTH)
    };
}

/**
 * Action to signal that a participant has joined.
 *
 * @param {Participant} participant - Information about participant.
 * @returns {{
 *      type: PARTICIPANT_JOINED,
 *      participant: Participant
 * }}
 */
export function participantJoined(participant) {
    return {
        type: PARTICIPANT_JOINED,
        participant
    };
}

/**
 * Action to signal that a participant has left.
 *
 * @param {string} id - Participant's ID.
 * @returns {{
 *     type: PARTICIPANT_LEFT,
 *     participant: {
 *         id: string
 *     }
 * }}
 */
export function participantLeft(id) {
    return {
        type: PARTICIPANT_LEFT,
        participant: {
            id
        }
    };
}

/**
 * Action to signal that a participant's role has changed.
 *
 * @param {string} id - Participant's ID.
 * @param {PARTICIPANT_ROLE} role - Participant's new role.
 * @returns {{
 *     type: PARTICIPANT_UPDATED,
 *     participant: {
 *         id: string,
 *         role: PARTICIPANT_ROLE
 *     }
 * }}
 */
export function participantRoleChanged(id, role) {
    return participantUpdated({
        id,
        role
    });
}

/**
 * Action to signal that some of participant properties has been changed.
 *
 * @param {Participant} participant={} - Information about participant. To
 * identify the participant the object should contain either property id with
 * value the id of the participant or property local with value true (if the
 * local participant hasn't joined the conference yet).
 * @returns {{
 *     type: PARTICIPANT_UPDATED,
 *     participant: Participant
 * }}
 */
export function participantUpdated(participant = {}) {
    return {
        type: PARTICIPANT_UPDATED,
        participant
    };
}

/**
 * Create an action which pins a conference participant.
 *
 * @param {string|null} id - The ID of the conference participant to pin or null
 * if none of the conference's participants are to be pinned.
 * @returns {{
 *     type: PIN_PARTICIPANT,
 *     participant: {
 *         id: string
 *     }
 * }}
 */
export function pinParticipant(id) {
    return {
        type: PIN_PARTICIPANT,
        participant: {
            id
        }
    };
}