import { ChangeDetectionStrategy, Component, computed, input, model, signal } from '@angular/core';
import { formatNumber, parseDecimal } from '../../core/format';
import { ControlBase } from './control-base';

@Component({
  selector: 'sbo-input',
  changeDetection: ChangeDetectionStrategy.OnPush,
  template: `
    <input
      class="sbo-in"
      type="text"
      autocomplete="off"
      [id]="id"
      [value]="value()"
      [readOnly]="readOnly()"
      [disabled]="disabled()"
      [required]="required()"
      [attr.maxlength]="maxlength()"
      [placeholder]="placeholder()"
      [attr.aria-label]="ariaLabel() ?? null"
      [attr.aria-invalid]="invalid() ? 'true' : null"
      [attr.aria-describedby]="describedBy()"
      (input)="value.set($any($event.target).value)"
    />
  `,
  styles: ':host { display: block; }',
})
export class TextInput extends ControlBase {
  readonly value = model('');
  readonly maxlength = input<number>();
  readonly placeholder = input('');
}

@Component({
  selector: 'sbo-textarea',
  changeDetection: ChangeDetectionStrategy.OnPush,
  template: `
    <textarea
      class="sbo-ta"
      [id]="id"
      [value]="value()"
      [readOnly]="readOnly()"
      [disabled]="disabled()"
      [required]="required()"
      [attr.maxlength]="maxlength()"
      [placeholder]="placeholder()"
      [rows]="rows()"
      [attr.aria-label]="ariaLabel() ?? null"
      [attr.aria-invalid]="invalid() ? 'true' : null"
      [attr.aria-describedby]="describedBy()"
      (input)="value.set($any($event.target).value)"
    ></textarea>
  `,
  styles: ':host { display: block; }',
})
export class TextareaInput extends ControlBase {
  readonly value = model('');
  readonly maxlength = input<number>();
  readonly placeholder = input('');
  readonly rows = input(3);
}

/**
 * Número o importe. Fuera de foco se muestra formateado (`1,234.50`); al editar se
 * escribe en texto libre y se interpreta al salir (acepta `12,5` y `1,234.50`).
 */
@Component({
  selector: 'sbo-number',
  changeDetection: ChangeDetectionStrategy.OnPush,
  template: `
    <input
      class="sbo-in num"
      type="text"
      inputmode="decimal"
      autocomplete="off"
      [id]="id"
      [value]="display()"
      [readOnly]="readOnly()"
      [disabled]="disabled()"
      [required]="required()"
      [attr.aria-label]="ariaLabel() ?? null"
      [attr.aria-invalid]="invalid() ? 'true' : null"
      [attr.aria-describedby]="describedBy()"
      (focus)="startEditing($event)"
      (input)="draft.set($any($event.target).value)"
      (blur)="finishEditing()"
    />
  `,
  styles: ':host { display: block; }',
})
export class NumberInput extends ControlBase {
  readonly value = model<number | null>(null);
  /** Decimales fijos al mostrar y redondear (importes: 2). Sin él: hasta 3, sin ceros sobrantes. */
  readonly decimals = input<number>();

  protected readonly editing = signal(false);
  protected readonly draft = signal('');
  protected readonly display = computed(() =>
    this.editing() ? this.draft() : formatNumber(this.value(), this.decimals()),
  );

  protected startEditing(event: FocusEvent): void {
    if (this.readOnly()) return;
    const v = this.value();
    this.draft.set(v === null ? '' : String(v));
    this.editing.set(true);
    // se selecciona el contenido una vez que el valor editable reemplazó al formateado
    const input = event.target as HTMLInputElement;
    queueMicrotask(() => input.select());
  }

  protected finishEditing(): void {
    if (!this.editing()) return;
    this.editing.set(false);
    const text = this.draft().trim();
    if (text === '') {
      this.value.set(null);
      return;
    }
    const parsed = parseDecimal(text);
    if (parsed === null) return; // no es un número: se conserva el valor anterior
    const d = this.decimals();
    this.value.set(d === undefined ? parsed : Math.round((parsed + Number.EPSILON) * 10 ** d) / 10 ** d);
  }
}

/** Fecha como texto ISO `yyyy-MM-dd` (el formato del Service Layer). Selector nativo: sin librerías. */
@Component({
  selector: 'sbo-date',
  changeDetection: ChangeDetectionStrategy.OnPush,
  template: `
    <input
      class="sbo-in"
      type="date"
      [id]="id"
      [value]="value()"
      [readOnly]="readOnly()"
      [disabled]="disabled()"
      [required]="required()"
      [attr.aria-label]="ariaLabel() ?? null"
      [attr.aria-invalid]="invalid() ? 'true' : null"
      [attr.aria-describedby]="describedBy()"
      (input)="value.set($any($event.target).value)"
    />
  `,
  styles: ':host { display: block; }',
})
export class DateInput extends ControlBase {
  readonly value = model('');
}

export interface SelectOption {
  value: string | number;
  label: string;
}

@Component({
  selector: 'sbo-select',
  changeDetection: ChangeDetectionStrategy.OnPush,
  template: `
    <select
      class="sbo-sel"
      [id]="id"
      [disabled]="disabled() || readOnly()"
      [required]="required()"
      [attr.aria-label]="ariaLabel() ?? null"
      [attr.aria-invalid]="invalid() ? 'true' : null"
      [attr.aria-describedby]="describedBy()"
      (change)="choose($any($event.target).value)"
    >
      @if (placeholder() !== undefined) {
        <option value="" [selected]="value() === null">{{ placeholder() }}</option>
      }
      @for (o of options(); track o.value) {
        <option [value]="o.value" [selected]="o.value === value()">{{ o.label }}</option>
      }
    </select>
  `,
  styles: ':host { display: block; }',
})
export class SelectInput extends ControlBase {
  readonly options = input.required<readonly SelectOption[]>();
  readonly value = model<string | number | null>(null);
  /** Opción vacía inicial (ej. "— Seleccione —"); sin él, no se ofrece. */
  readonly placeholder = input<string>();

  protected choose(raw: string): void {
    const option = this.options().find((o) => String(o.value) === raw);
    this.value.set(option ? option.value : null);
  }
}