import { sortStatus } from './friend';

/**
 *
 * @param {object} a
 * @param {object} b
 * @returns
 */
function compareByName(a, b) {
    if (typeof a.name !== 'string' || typeof b.name !== 'string') {
        return 0;
    }
    return a.name.localeCompare(b.name);
}

/**
 * descending
 * @param {object} a
 * @param {object} b
 * @returns
 */
function compareByCreatedAt(a, b) {
    if (typeof a.created_at !== 'string' || typeof b.created_at !== 'string') {
        return 0;
    }
    const A = a.created_at.toUpperCase();
    const B = b.created_at.toUpperCase();
    if (A < B) {
        return 1;
    }
    if (A > B) {
        return -1;
    }
    return 0;
}

/**
 * ascending
 * @param {object} a
 * @param {object} b
 * @returns
 */
function compareByCreatedAtAscending(a, b) {
    const A = a.created_at;
    const B = b.created_at;
    if (A < B) {
        return -1;
    }
    if (A > B) {
        return 1;
    }
    return 0;
}

/**
 * descending
 * @param {object} a
 * @param {object} b
 * @returns
 */
function compareByUpdatedAt(a, b) {
    if (typeof a.updated_at !== 'string' || typeof b.updated_at !== 'string') {
        return 0;
    }
    const A = a.updated_at.toUpperCase();
    const B = b.updated_at.toUpperCase();
    if (A < B) {
        return 1;
    }
    if (A > B) {
        return -1;
    }
    return 0;
}

/**
 * ascending
 * @param {object} a
 * @param {object} b
 * @returns
 */
function compareByDisplayName(a, b) {
    if (
        typeof a.displayName !== 'string' ||
        typeof b.displayName !== 'string'
    ) {
        return 0;
    }
    return a.displayName.localeCompare(b.displayName);
}

/**
 *
 * @param {object} a
 * @param {object} b
 * @returns
 */
function compareByMemberCount(a, b) {
    if (
        typeof a.memberCount !== 'number' ||
        typeof b.memberCount !== 'number'
    ) {
        return 0;
    }
    return a.memberCount - b.memberCount;
}

/**
 * private
 * @param {object} a
 * @param {object} b
 * @returns
 */
function compareByPrivate(a, b) {
    if (typeof a.ref === 'undefined' || typeof b.ref === 'undefined') {
        return 0;
    }
    if (a.ref.location === 'private' && b.ref.location === 'private') {
        return 0;
    } else if (a.ref.location === 'private') {
        return 1;
    } else if (b.ref.location === 'private') {
        return -1;
    }
    return 0;
}

/**
 *
 * @param {object} a
 * @param {object} b
 * @returns
 */
function compareByStatus(a, b) {
    if (typeof a.ref === 'undefined' || typeof b.ref === 'undefined') {
        return 0;
    }
    if (a.ref.status === b.ref.status) {
        return 0;
    }
    if (a.ref.state === 'offline') {
        return 1;
    }
    return sortStatus(a.ref.status, b.ref.status);
}

/**
 * last active
 * @param {object} a
 * @param {object} b
 * @returns
 */
function compareByLastActive(a, b) {
    if (a.state === 'online' && b.state === 'online') {
        if (
            a.ref?.$online_for &&
            b.ref?.$online_for &&
            a.ref.$online_for === b.ref.$online_for
        ) {
            compareByActivityField(a, b, 'last_login');
        }
        return compareByActivityField(a, b, '$online_for');
    }

    return compareByActivityField(a, b, 'last_activity');
}

/**
 * last seen
 * @param {object} a
 * @param {object} b
 * @returns
 */
function compareByLastSeen(a, b) {
    return compareByActivityField(a, b, '$lastSeen');
}

/**
 *
 * @param {object} a
 * @param {object} b
 * @param {string} field
 * @returns
 */
function compareByActivityField(a, b, field) {
    if (typeof a.ref === 'undefined' || typeof b.ref === 'undefined') {
        return 0;
    }

    // When the field is just and empty string, it means they've been
    // in whatever active state for the longest
    if (
        a.ref[field] < b.ref[field] ||
        (a.ref[field] !== '' && b.ref[field] === '')
    ) {
        return 1;
    }
    if (
        a.ref[field] > b.ref[field] ||
        (a.ref[field] === '' && b.ref[field] !== '')
    ) {
        return -1;
    }
    return 0;
}

/**
 * location at
 * @param {object} a
 * @param {object} b
 * @returns
 */
function compareByLocationAt(a, b) {
    if (a.location === 'traveling' && b.location === 'traveling') {
        return 0;
    }
    if (a.location === 'traveling') {
        return 1;
    }
    if (b.location === 'traveling') {
        return -1;
    }
    if (a.$location_at < b.$location_at) {
        return -1;
    }
    if (a.$location_at > b.$location_at) {
        return 1;
    }
    return 0;
}

/**
 * location at but for the sidebar
 * @param {object} a
 * @param {object} b
 * @returns
 */
function compareByLocation(a, b) {
    if (typeof a.ref === 'undefined' || typeof b.ref === 'undefined') {
        return 0;
    }
    if (a.state !== 'online' || b.state !== 'online') {
        return 0;
    }

    return a.ref.location.localeCompare(b.ref.location);
}

export {
    compareByName,
    compareByCreatedAt,
    compareByCreatedAtAscending,
    compareByUpdatedAt,
    compareByDisplayName,
    compareByMemberCount,
    compareByPrivate,
    compareByStatus,
    compareByLastActive,
    compareByLastSeen,
    compareByLocationAt,
    compareByLocation
};