import { VisibilityRule } from './models/VisibilityRule';
import { VisibilityRulesContext } from './models/VisibilityRulesContext';
import { FormGroup } from '@angular/forms';
import { Injectable } from '@angular/core';
import { Rule } from '../models/Rule'
@Injectable()
export class VisibilityRulesService {

    public formGroup: FormGroup;
    public visibilityRuleContext: VisibilityRulesContext;
    public fieldsPathMemory: any = {};
    private elementVisibilityMap = new Map<String, boolean>();

    public isElementVisible(pathKey: string, id: string) {
        if (!this.fieldsPathMemory[id] && pathKey) this.fieldsPathMemory[id] = pathKey;
        if (this.checkElementVisibility(id)) {
            return true
        } else {
            this.clearValues(pathKey)
            return false;
        }
    }

    public checkElementVisibility(id: string): boolean {
        if (!this.elementVisibilityMap.has(id) || this.elementVisibilityMap.get(id)) return true;
        else return false;
    }

    public buildVisibilityRules(item: Array<Rule>) {
        this.visibilityRuleContext = new VisibilityRulesContext();
        this.visibilityRuleContext.buildVisibilityRuleContext(item);
        this.visibilityRuleContext.rules.forEach(item => this.evaluateVisibility(item))
    }

    public updateValueAndVisibility(id: string) {
        let visibilityRules = this.visibilityRuleContext.rules.filter(item => item.sourceVisibilityRules.filter(source => source.sourceControlId === id).length > 0);
        visibilityRules.forEach(item => this.evaluateVisibility(item))
    }

    private evaluateVisibility(visibilityRule: VisibilityRule) {
        for (let i = 0; i < visibilityRule.sourceVisibilityRules.length; i++) {
            let pathKey = this.fieldsPathMemory[visibilityRule.sourceVisibilityRules[i].sourceControlId];
            if (this.formGroup.get(pathKey + '.value') && (!this.formGroup.get(pathKey + '.value').value || ""+this.formGroup.get(pathKey + '.value').value != ""+visibilityRule.sourceVisibilityRules[i].sourceControlValue)) {
                this.elementVisibilityMap.set(visibilityRule.targetControlId, false)
                return;
            }
            this.elementVisibilityMap.set(visibilityRule.targetControlId, true)
        }
    }

    private getParentPath(parentId: string): string {
        return '';
    }

    private clearValues(pathKey) {
        if (pathKey && this.formGroup.get(pathKey + '.value')) this.formGroup.get(pathKey + '.value').patchValue(null)
        if (pathKey && this.formGroup.get(pathKey)["controls"].fields) {
            for (var i = 0; i < this.formGroup.get(pathKey)["controls"].fields.length; i++)
                this.clearValues(pathKey + '.fields.' + i);
        }

    }
}