import {InkObject} from './Object';
import {Path} from './Path';
import {Container} from './Container';
import {throwNullException} from './NullException';

export class ChoicePoint extends InkObject{
	public _pathOnChoice: Path | null = null;
	public hasCondition: boolean = false;
	public hasStartContent: boolean = false;
	public hasChoiceOnlyContent: boolean = false;
	public isInvisibleDefault: boolean = false;
	public onceOnly: boolean = true;

	constructor(onceOnly: boolean = true){
		super();
		this.onceOnly = onceOnly;
	}
	get pathOnChoice(): Path | null{
		if (this._pathOnChoice != null && this._pathOnChoice.isRelative) {
			let choiceTargetObj = this.choiceTarget;
			if (choiceTargetObj) {
				this._pathOnChoice = choiceTargetObj.path;
			}
		}
		return this._pathOnChoice;
	}
	set pathOnChoice(value: Path | null){
		this._pathOnChoice = value;
	}
	get choiceTarget(): Container | null{
		if (this._pathOnChoice === null) return throwNullException('ChoicePoint._pathOnChoice');
		return this.ResolvePath(this._pathOnChoice).container;
	}
	get pathStringOnChoice(): string{
		if (this.pathOnChoice === null) return throwNullException('ChoicePoint.pathOnChoice');
		return this.CompactPathString(this.pathOnChoice);
	}
	set pathStringOnChoice(value: string){
		this.pathOnChoice = new Path(value);
	}
	get flags(): number{
		let flags = 0;
		if (this.hasCondition)         flags |= 1;
		if (this.hasStartContent)      flags |= 2;
		if (this.hasChoiceOnlyContent) flags |= 4;
		if (this.isInvisibleDefault)   flags |= 8;
		if (this.onceOnly)             flags |= 16;
		return flags;
	}
	set flags(value: number){
		this.hasCondition = (value & 1) > 0;
		this.hasStartContent = (value & 2) > 0;
		this.hasChoiceOnlyContent = (value & 4) > 0;
		this.isInvisibleDefault = (value & 8) > 0;
		this.onceOnly = (value & 16) > 0;
	}
	public toString(): string{
		if (this.pathOnChoice === null) return throwNullException('ChoicePoint.pathOnChoice');
		// int? targetLineNum = DebugLineNumberOfPath (pathOnChoice);
		let targetLineNum = null;
		let targetString = this.pathOnChoice.toString();

		if (targetLineNum != null) {
			 targetString = ' line ' + targetLineNum + '('+targetString+')';
		}

		return 'Choice: -> ' + targetString;
	}
}