import { ChangeDetectionStrategy, Component, inject, signal } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { ProjectEditorFacade } from '../facade/project-editor.facade';
import { TranslatePipe } from '../../../i18n/translate.pipe';
import { TranslateService } from '../../../i18n/translate.service';
import { InputComponent } from '../../../shared/ui/input/input.component';
import { SectionCardComponent } from '../../../shared/ui/section-card/section-card.component';
import { ToggleComponent } from '../../../shared/ui/toggle/toggle.component';

@Component({
  selector: 'app-project-editor-widgets-section',
  standalone: true,
  imports: [FormsModule, TranslatePipe, InputComponent, SectionCardComponent, ToggleComponent],
  templateUrl: './widgets-section.component.html',
  styleUrls: ['./section.shared.scss'],
  changeDetection: ChangeDetectionStrategy.OnPush
})
export class ProjectEditorWidgetsSectionComponent {
  private readonly facade = inject(ProjectEditorFacade);
  private readonly translate = inject(TranslateService);
  readonly widgets = this.facade.homepageWidgets;
  readonly fieldError = (key: string): string | null => {
    const messageKey = this.facade.fieldError(key);
    return messageKey ? this.translate.t(messageKey) : null;
  };

  updateWidget(widgetId: string, updater: (props: Record<string, unknown>) => Record<string, unknown>): void {
    this.facade.updateBootstrap(current => ({
      ...current,
      pages: current.pages.map(page => ({
        ...page,
        sections: page.sections.map(section => ({
          ...section,
          widgets: section.widgets.map(widget => widget.id !== widgetId ? widget : ({
            ...widget,
            props: updater(widget.props ?? {})
          }))
        }))
      }))
    }));
  }

  updateProp(widgetId: string, key: string, value: unknown): void {
    this.updateWidget(widgetId, props => ({ ...props, [key]: value }));
  }

  private readonly jsonDrafts = signal<Record<string, string>>({});
  private readonly jsonErrors = signal<Record<string, string>>({});

  /**
   * While the textarea holds invalid JSON, keep showing the user's own draft
   * (not the last-committed props) so their in-progress edit isn't silently
   * overwritten on the next change-detection pass.
   */
  widgetJsonValue(widgetId: string, props: Record<string, unknown>): string {
    return this.jsonDrafts()[widgetId] ?? this.propsJson(props);
  }

  widgetJsonError(widgetId: string): string | null {
    return this.jsonErrors()[widgetId] ?? null;
  }

  updateJson(widgetId: string, raw: string): void {
    try {
      const parsed = JSON.parse(raw);
      this.updateWidget(widgetId, () => parsed);
      this.jsonDrafts.update(({ [widgetId]: _removed, ...rest }) => rest);
      this.jsonErrors.update(({ [widgetId]: _removed, ...rest }) => rest);
    } catch {
      this.jsonDrafts.update(drafts => ({ ...drafts, [widgetId]: raw }));
      this.jsonErrors.update(errors => ({ ...errors, [widgetId]: this.translate.t('builder.widgetJsonInvalid') }));
    }
  }

  propsJson(props: Record<string, unknown>): string {
    return JSON.stringify(props ?? {}, null, 2);
  }
}