import { ChangeDetectionStrategy, Component, forwardRef, input } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';

export type InputSize = 'sm' | 'md' | 'lg';
export type InputState = 'default' | 'error' | 'success';

@Component({
  selector: 'app-input',
  standalone: true,
  templateUrl: './input.component.html',
  styleUrl: './input.component.scss',
  changeDetection: ChangeDetectionStrategy.OnPush,
  providers: [
    {
      provide: NG_VALUE_ACCESSOR,
      useExisting: forwardRef(() => InputComponent),
      multi: true
    }
  ],
  host: {
    '[class.app-input-host--full-width]': 'fullWidth()'
  }
})
export class InputComponent implements ControlValueAccessor {
  readonly type = input<'text' | 'email' | 'password' | 'number' | 'search' | 'tel' | 'url'>('text');
  readonly size = input<InputSize>('md');
  readonly state = input<InputState>('default');
  readonly placeholder = input('');
  readonly disabled = input(false);
  readonly fullWidth = input(false);
  readonly ariaLabel = input<string | null>(null);

  protected value: string | number = '';
  protected isDisabled = false;

  private onChange: (value: string | number) => void = () => {};
  private onTouched: () => void = () => {};

  writeValue(value: string | number): void {
    this.value = value ?? '';
  }

  registerOnChange(fn: (value: string | number) => void): void {
    this.onChange = fn;
  }

  registerOnTouched(fn: () => void): void {
    this.onTouched = fn;
  }

  setDisabledState(isDisabled: boolean): void {
    this.isDisabled = isDisabled;
  }

  protected handleInput(event: Event): void {
    const target = event.target as HTMLInputElement;
    this.value = target.value;
    this.onChange(this.value);
  }

  protected handleBlur(): void {
    this.onTouched();
  }
}