// @flow

import { JitsiRecordingConstants } from '../base/lib-jitsi-meet';
import { isEnabled as isDropboxEnabled } from '../dropbox';

import { RECORDING_STATUS_PRIORITIES, RECORDING_TYPES } from './constants';

/**
 * Searches in the passed in redux state for an active recording session of the
 * passed in mode.
 *
 * @param {Object} state - The redux state to search in.
 * @param {string} mode - Find an active recording session of the given mode.
 * @returns {Object|undefined}
 */
export function getActiveSession(state: Object, mode: string) {
    const { sessionDatas } = state['features/recording'];
    const { status: statusConstants } = JitsiRecordingConstants;

    return sessionDatas.find(sessionData => sessionData.mode === mode
        && (sessionData.status === statusConstants.ON
            || sessionData.status === statusConstants.PENDING));
}

/**
 * Returns an estimated recording duration based on the size of the video file
 * in MB. The estimate is calculated under the assumption that 1 min of recorded
 * video needs 10MB of storage on average.
 *
 * @param {number} size - The size in MB of the recorded video.
 * @returns {number} - The estimated duration in minutes.
 */
export function getRecordingDurationEstimation(size: ?number) {
    return Math.floor((size || 0) / 10);
}

/**
 * Searches in the passed in redux state for a recording session that matches
 * the passed in recording session ID.
 *
 * @param {Object} state - The redux state to search in.
 * @param {string} id - The ID of the recording session to find.
 * @returns {Object|undefined}
 */
export function getSessionById(state: Object, id: string) {
    return state['features/recording'].sessionDatas.find(
        sessionData => sessionData.id === id);
}

/**
 * Fetches the recording link from the server.
 *
 * @param {string} url - The base url.
 * @param {string} recordingSessionId - The ID of the recording session to find.
 * @param {string} region - The meeting region.
 * @param {string} tenant - The meeting tenant.
 * @returns {Promise<any>}
 */
export async function getRecordingLink(url: string, recordingSessionId: string, region: string, tenant: string) {
    const fullUrl = `${url}?recordingSessionId=${recordingSessionId}&region=${region}&tenant=${tenant}`;
    const res = await fetch(fullUrl, {
        headers: {
            'Content-Type': 'application/json'
        }
    });
    const json = await res.json();

    return res.ok ? json : Promise.reject(json);
}

/**
 * Selector used for determining if recording is saved on dropbox.
 *
 * @param {Object} state - The redux state to search in.
 * @returns {string}
 */
export function isSavingRecordingOnDropbox(state: Object) {
    return isDropboxEnabled(state)
        && state['features/recording'].selectedRecordingService === RECORDING_TYPES.DROPBOX;
}

/**
 * Returns the recording session status that is to be shown in a label. E.g. If
 * there is a session with the status OFF and one with PENDING, then the PENDING
 * one will be shown, because that is likely more important for the user to see.
 *
 * @param {Object} state - The redux state to search in.
 * @param {string} mode - The recording mode to get status for.
 * @returns {string|undefined}
 */
export function getSessionStatusToShow(state: Object, mode: string): ?string {
    const recordingSessions = state['features/recording'].sessionDatas;
    let status;

    if (Array.isArray(recordingSessions)) {
        for (const session of recordingSessions) {
            if (session.mode === mode
                    && (!status
                        || (RECORDING_STATUS_PRIORITIES.indexOf(session.status)
                            > RECORDING_STATUS_PRIORITIES.indexOf(status)))) {
                status = session.status;
            }
        }
    }

    return status;
}


/**
 * Returns the resource id.
 *
 * @param {Object | string} recorder - A participant or it's resource.
 * @returns {string|undefined}
 */
export function getResourceId(recorder: string | Object) {
    if (recorder) {
        return typeof recorder === 'string'
            ? recorder
            : recorder.getId();
    }
}