import { Component, ChangeDetectionStrategy, input, output, inject, effect } from '@angular/core';
import { CommonModule } from '@angular/common';
import { GraphConfig } from '../graph-settings.types';
import { GraphSettingsService } from '../graph-settings.service';
import { GraphSettingsAccordionComponent } from '../../../components/graph-settings/graph-settings-accordion.component';

@Component({
  selector: 'app-graph-settings-panel',
  standalone: true,
  imports: [
    CommonModule,
    GraphSettingsAccordionComponent
  ],
  changeDetection: ChangeDetectionStrategy.OnPush,
  template: `
    <div class="settings-panel">
      @if (isOpen()) {
        <div class="backdrop" (click)="close.emit()"></div>

        <div class="panel-content">
          <div class="panel-header">
            <h2 class="text-lg font-semibold text-gray-900 dark:text-gray-100">Graph settings</h2>
            <div class="flex items-center gap-2">
              <!-- Expand all -->
              <button
                type="button"
                class="btn-standard-icon"
                title="Expand all"
                (click)="accordion?.expandAll()">
                <svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 12h16M12 4v16" />
                </svg>
              </button>

              <!-- Collapse all -->
              <button
                type="button"
                class="btn-standard-icon"
                title="Collapse all"
                (click)="accordion?.collapseAll()">
                <svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 12h16" />
                </svg>
              </button>

              <button
                type="button"
                (click)="onResetAll()"
                class="btn-standard-icon"
                title="Reset all settings">
                <svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M4 4v5h.582m15.356 2A8.001 8.001 0 004.582 9m0 0H9m11 11v-5h-.581m0 0a8.003 8.003 0 01-15.357-2m15.357 2H15" />
                </svg>
              </button>

              <button
                type="button"
                (click)="close.emit()"
                (keydown.escape)="close.emit()"
                class="btn-standard-icon"
                aria-label="Close settings"
                title="Close">
                <svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
                </svg>
              </button>
            </div>
          </div>

          <div class="panel-body">
            <ov-graph-settings-accordion
              #accordion
              [config]="config()"
              (configChange)="onConfigChange($event)"
              (animateRequested)="animateRequested.emit()">
            </ov-graph-settings-accordion>
          </div>
        </div>
      }
    </div>
  `,
  styles: [`
    .settings-panel {
      position: fixed;
      inset: 0;
      z-index: 2000;
      pointer-events: none;
    }

    .backdrop {
      position: fixed;
      inset: 0;
      background-color: rgba(0, 0, 0, 0.5);
      z-index: 1990;
      pointer-events: auto;
    }

    .panel-content {
      position: fixed;
      top: 0;
      right: 0;
      bottom: 0;
      width: 100%;
      max-width: 400px;
      background-color: white;
      box-shadow: -4px 0 6px -1px rgba(0, 0, 0, 0.1), -2px 0 4px -1px rgba(0, 0, 0, 0.06);
      display: flex;
      flex-direction: column;
      z-index: 2001;
      transform: translateX(0);
      pointer-events: auto;
    }

    :host-context(.dark) .panel-content {
      background-color: #1F2937;
    }

    .panel-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 1rem 1.5rem;
      border-bottom: 1px solid #E5E7EB;
    }

    :host-context(.dark) .panel-header {
      border-bottom-color: #374151;
    }

    .panel-body {
      flex: 1;
      overflow-y: auto;
      padding: 1rem;
    }

    @media (max-width: 768px) {
      .panel-content {
        max-width: 100%;
      }
    }
  `]
})
export class GraphSettingsPanelComponent {
  isOpen = input.required<boolean>();
  close = output<void>();
  animateRequested = output<void>();

  private settingsService = inject(GraphSettingsService);
  
  config = this.settingsService.config;

  constructor() {
    // Listen to Escape key globally when panel is open
    effect(() => {
      if (!this.isOpen()) {
        return;
      }

      const handler = (e: KeyboardEvent) => {
        if (e.key === 'Escape') {
          this.close.emit();
        }
      };

      document.addEventListener('keydown', handler);

      return () => document.removeEventListener('keydown', handler);
    });
  }

  onConfigChange(patch: Partial<GraphConfig>): void {
    this.settingsService.save(patch);
  }

  onResetAll(): void {
    if (confirm('Reset all graph settings to defaults?')) {
      this.settingsService.resetToDefaults();
    }
  }
}