import { Component, Input, OnInit } from '@angular/core';
import { FormGroup, FormControl, FormArray } from '@angular/forms'
@Component({
    selector: 'progress-bar',
    templateUrl: './progress-bar.component.html',
})
export class ProgressBarComponent implements OnInit {
    @Input() formGroup: FormGroup

    private value: number;
    ngOnInit() {
        this.formGroup
            .valueChanges
            .subscribe(control => {
                this.value = (this.getDirtyValues(this.formGroup) / this.getFormControlDepthLength(this.formGroup)) * 100
            })
    }

    getDirtyValues(form: FormGroup): number {
        let value = 0;
        Object.keys(form.controls).forEach(key => {
            let control = form.controls[key]
            if (control instanceof FormGroup) value += this.getDirtyValues(control);
            else if (control instanceof FormArray) {
                let formArray = (<FormArray>control);
                for (let i = 0; i < formArray.length; i++) {
                    value += this.getDirtyValues(<FormGroup>formArray.get("" + i))
                }
            }
            else if (control.valid) value++;
        });
        return value;
    }

    getFormControlDepthLength(form: FormGroup): number {
        let value = 0;
        Object.keys(form.controls).forEach(key => {
            let control = form.controls[key]
            if (control instanceof FormGroup) value += this.getFormControlDepthLength(control);
            else if (control instanceof FormArray) {
                let formArray = (<FormArray>control);
                for (let i = 0; i < formArray.length; i++) {
                    value += this.getFormControlDepthLength(<FormGroup>formArray.get("" + i))
                }
            }
            else if (control instanceof FormControl) value++;
        });
        return value;
    }
}