// @flow
import type { Dispatch } from 'redux';

import { getLocalParticipant, getParticipantById, pinParticipant } from '../base/participants';

import {
    SET_HORIZONTAL_VIEW_DIMENSIONS,
    SET_TILE_VIEW_DIMENSIONS,
    SET_VERTICAL_VIEW_DIMENSIONS,
    SET_VOLUME
} from './actionTypes';
import {
    HORIZONTAL_FILMSTRIP_MARGIN,
    SCROLL_SIZE,
    STAGE_VIEW_THUMBNAIL_HORIZONTAL_BORDER,
    STAGE_VIEW_THUMBNAIL_VERTICAL_BORDER,
    TILE_HORIZONTAL_MARGIN,
    TILE_VERTICAL_MARGIN,
    VERTICAL_FILMSTRIP_VERTICAL_MARGIN
} from './constants';
import {
    calculateThumbnailSizeForHorizontalView,
    calculateThumbnailSizeForTileView,
    calculateThumbnailSizeForVerticalView
} from './functions';

export * from './actions.any';

/**
 * Sets the dimensions of the tile view grid.
 *
 * @param {Object} dimensions - Whether the filmstrip is visible.
 * @param {Object | Function} stateful - An object or function that can be
 * resolved to Redux state using the {@code toState} function.
 * @returns {Function}
 */
export function setTileViewDimensions(dimensions: Object) {
    return (dispatch: Dispatch<any>, getState: Function) => {
        const state = getState();
        const { clientHeight, clientWidth } = state['features/base/responsive-ui'];
        const { disableResponsiveTiles } = state['features/base/config'];
        const {
            height,
            width
        } = calculateThumbnailSizeForTileView({
            ...dimensions,
            clientWidth,
            clientHeight,
            disableResponsiveTiles
        });
        const { columns, rows } = dimensions;
        const thumbnailsTotalHeight = rows * (TILE_VERTICAL_MARGIN + height);
        const hasScroll = clientHeight < thumbnailsTotalHeight;
        const filmstripWidth = (columns * (TILE_HORIZONTAL_MARGIN + width)) + (hasScroll ? SCROLL_SIZE : 0);
        const filmstripHeight = Math.min(clientHeight, thumbnailsTotalHeight);

        dispatch({
            type: SET_TILE_VIEW_DIMENSIONS,
            dimensions: {
                gridDimensions: dimensions,
                thumbnailSize: {
                    height,
                    width
                },
                filmstripHeight,
                filmstripWidth
            }
        });
    };
}

/**
 * Sets the dimensions of the thumbnails in vertical view.
 *
 * @returns {Function}
 */
export function setVerticalViewDimensions() {
    return (dispatch: Dispatch<any>, getState: Function) => {
        const state = getState();
        const { clientHeight = 0, clientWidth = 0 } = state['features/base/responsive-ui'];
        const thumbnails = calculateThumbnailSizeForVerticalView(clientWidth);

        dispatch({
            type: SET_VERTICAL_VIEW_DIMENSIONS,
            dimensions: {
                ...thumbnails,
                remoteVideosContainer: {
                    width: thumbnails?.local?.width
                        + TILE_HORIZONTAL_MARGIN + STAGE_VIEW_THUMBNAIL_HORIZONTAL_BORDER + SCROLL_SIZE,
                    height: clientHeight - thumbnails?.local?.height - VERTICAL_FILMSTRIP_VERTICAL_MARGIN
                }
            }

        });
    };
}

/**
 * Sets the dimensions of the thumbnails in horizontal view.
 *
 * @returns {Function}
 */
export function setHorizontalViewDimensions() {
    return (dispatch: Dispatch<any>, getState: Function) => {
        const state = getState();
        const { clientHeight = 0, clientWidth = 0 } = state['features/base/responsive-ui'];
        const thumbnails = calculateThumbnailSizeForHorizontalView(clientHeight);

        dispatch({
            type: SET_HORIZONTAL_VIEW_DIMENSIONS,
            dimensions: {
                ...thumbnails,
                remoteVideosContainer: {
                    width: clientWidth - thumbnails?.local?.width - HORIZONTAL_FILMSTRIP_MARGIN,
                    height: thumbnails?.local?.height
                        + TILE_VERTICAL_MARGIN + STAGE_VIEW_THUMBNAIL_VERTICAL_BORDER + SCROLL_SIZE
                }
            }
        });
    };
}

/**
 * Emulates a click on the n-th video.
 *
 * @param {number} n - Number that identifies the video.
 * @returns {Function}
 */
export function clickOnVideo(n: number) {
    return (dispatch: Function, getState: Function) => {
        const state = getState();
        const { id: localId } = getLocalParticipant(state);

        // Use the list that correctly represents the current order of the participants as visible in the UI.
        const { remoteParticipants } = state['features/filmstrip'];
        const participants = [ localId, ...remoteParticipants ];
        const { id, pinned } = getParticipantById(state, participants[n]);

        dispatch(pinParticipant(pinned ? null : id));
    };
}

/**
 * Sets the volume for a thumbnail's audio.
 *
 * @param {string} participantId - The participant ID asociated with the audio.
 * @param {string} volume - The volume level.
 * @returns {{
 *     type: SET_VOLUME,
 *     participantId: string,
 *     volume: number
 * }}
 */
export function setVolume(participantId: string, volume: number) {
    return {
        type: SET_VOLUME,
        participantId,
        volume
    };
}