import { utils } from "./utils";

export class OrderProperty {
    constructor(private propertyPath: string, private isDesc: boolean = null) {
        if (!utils.isString(propertyPath))
            throw new Error("Property name is not a valid string");

        propertyPath = propertyPath.trim();

        const parts = propertyPath.split(" ");
        // parts[0] is the propertyPath; [1] would be whether descending or not.
        if (parts.length > 1 && isDesc !== true && isDesc !== false) {
            isDesc = parts[1].toLowerCase() == "desc";
            if (!isDesc) {
                // isDesc is false but check to make sure its intended.
                const isAsc = parts[1].toLowerCase() == "asc";
                if (!isAsc) {
                    throw new Error("the second word in the propertyPath must begin with 'desc' or 'asc'");
                }
            }
        }

        this.propertyPath = parts[0];
        this.isDesc = isDesc;
    }

    getPropertyPath(): string {
        return this.propertyPath;
    }

    getDirection(): boolean {
        return this.isDesc;
    }

    getValue(): string {
        const direction = (this.isDesc) ? "desc" : "asc";
        return this.propertyPath + " " + direction;
    }
}