// Angular imports //
import { OnInit, Input, Output, EventEmitter } from '@angular/core';

// Components //

// Interfaces //
import { IUpdateModel } from './forms.interface';

// Services //

// Directives //

// Other //

export class FbFormBase implements OnInit {

    @Input() model: fb.ChangeTrack<any>;
    @Input() label: string;
    @Input() disabled: boolean = false; // OBS! Har bytt namn från disable
    @Input() disableReason: string;
    @Input() noLabel: boolean = false;

    @Output()
    onValueChange: EventEmitter<any> = new EventEmitter<any>();

    protected oldModelValue: any;

    ngOnInit(): void {
        if (this.model === undefined) {
            const errorString: string =
                `Missing required parameter 'model' for ${this.getStringFromModel()}`;
            throw new Error(errorString);
        }

        this.oldModelValue = this.model.value;
    }

    updateModel<T>(data: T): void {
        if (typeof this.model === 'undefined' || this.model === null || typeof this.model !== 'object') {
            console.log('Felaktig typ att bevaka');
            return;
        }
        if (data !== this.model.value && !((data as any) === '' && this.model.value === null)) {
            this.model.setValue(data);
            const lastOldModelValue: T = this.oldModelValue;
            this.oldModelValue = data;

            const emitVal: IUpdateModel = { newVal: data, oldVal: lastOldModelValue };
            this.onValueChange.emit(emitVal);
        }
    }

    // TODO frha: Se till att denna används genomgående vid kastande av fel
    protected getStringFromModel(): string {
        const str: string = `fbForm-component${
            this.model && this.model.propertyReference ? ` with propertyReference ${this.model.propertyReference}` : ''}${
            this.constructor.name ? ` of type ${this.constructor.name}` : ''}${
            this.label ? ` with label ${this.label}` : ''}`;
        return str;
    }
}