import {ArgumentFilter, ArgumentWorker, ArgumentProcessorContext} from "./types";
import {InputHelper} from "./input-helper";
import {ValueValidatorObject, ValueSanitizerObject} from "../../value-checker/base";
import {Request} from "express-serve-static-core";

export interface OptionalDefaultFunction<ReqType, ResType> {
	(this: ArgumentProcessorContext<ReqType, ResType>, req: Request): any;
}

export class ParamInputHelper<ReqType, ResType> extends InputHelper<ReqType, ResType> {
	filter(fn: ArgumentFilter<ReqType, ResType> | ValueValidatorObject) {
		if (typeof fn === 'function') {
			this.state.filter = fn;
		} else {
			this.state.filter = fn.getFunction();
		}
		return this;
	}
	
	optional(defaultValue: any | OptionalDefaultFunction<ReqType, ResType> = null) {
		this.state.optionalDefault = defaultValue;
		return this;
	}
	
	optionalCallback(defaultValue: OptionalDefaultFunction<ReqType, ResType> = null) {
		this.state.optionalDefault = defaultValue;
		return this;
	}
	
	sanitize(fn: ArgumentWorker<ReqType, ResType> | ValueSanitizerObject) {
		if (typeof fn === 'function') {
			this.state.handler = fn;
		} else {
			this.state.handler = fn.getFunction();
		}
		return this;
	}
}

export class SafeParamInputHelper<ReqType, ResType> extends InputHelper<ReqType, ResType> {
}