module.exports = Self => {
    /**
     * Checks if current user has
     * read privileges over a dms
     *
     * @param {Object} ctx - Request context
     * @param {Interger} id - DmsType id
     * @param {Object} options - Query options
     * @return {Boolean} True for user with read privileges
     */
    Self.hasReadRole = async(ctx, id, options) => {
        const models = Self.app.models;
        const dmsType = await models.DmsType.findById(id, {
            include: {
                relation: 'readRole'
            }
        }, options);

        return await hasRole(ctx, dmsType, options);
    };

    /**
     * Checks if current user has
     * write privileges over a dms
     *
     * @param {Object} ctx - Request context
     * @param {Interger} id - DmsType id
     * @param {Object} options - Query options
     * @return {Boolean} True for user with write privileges
     */
    Self.hasWriteRole = async(ctx, id, options) => {
        const models = Self.app.models;
        const dmsType = await models.DmsType.findById(id, {
            include: {
                relation: 'writeRole'
            }
        }, options);

        return await hasRole(ctx, dmsType, options);
    };

    /**
     * Checks if current user has
     * read or write privileges
     * @param {Object} ctx - Context
     * @param {Object} dmsType - Dms type [read/write]
     * @param {Object} options - Query options
     */
    async function hasRole(ctx, dmsType, options) {
        const models = Self.app.models;
        const myUserId = ctx.req.accessToken.userId;

        const readRole = dmsType.readRole() && dmsType.readRole().name;
        const writeRole = dmsType.writeRole() && dmsType.writeRole().name;
        const requiredRole = readRole || writeRole;

        const hasRequiredRole = await models.VnUser.hasRole(myUserId, requiredRole, options);
        const isRoot = await models.VnUser.hasRole(myUserId, 'root', options);

        if (isRoot || hasRequiredRole)
            return true;

        return false;
    }
};