import {
  Component,
  Input,
  Output,
  EventEmitter,
  signal,
  ViewChild,
  ElementRef,
  ChangeDetectionStrategy,
  AfterViewInit
} from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { SearchQueryAssistantComponent } from '../search-query-assistant/search-query-assistant.component';
import { inject } from '@angular/core';
import { SearchHistoryService } from '../../core/search/search-history.service';

/**
 * Search input with integrated query assistant
 * Wraps a text input and manages the search assistant popover
 */
@Component({
  selector: 'app-search-input-with-assistant',
  standalone: true,
  imports: [CommonModule, FormsModule, SearchQueryAssistantComponent],
  changeDetection: ChangeDetectionStrategy.OnPush,
  template: `
    <div class="relative">
      <div class="relative">
        <svg 
          *ngIf="showSearchIcon"
          class="pointer-events-none absolute left-3 top-1/2 h-5 w-5 -translate-y-1/2 text-text-muted" 
          xmlns="http://www.w3.org/2000/svg" 
          fill="none" 
          viewBox="0 0 24 24" 
          stroke="currentColor">
          <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
        </svg>
        
        <input
          #searchInput
          type="text"
          [placeholder]="placeholder"
          [value]="value"
          (input)="onInputChange($event)"
          (focus)="onFocus()"
          (blur)="onBlur()"
          (keydown.enter)="onEnter()"
          [class]="inputClass"
          [attr.aria-label]="placeholder"
        />

        <button
          *ngIf="value"
          (click)="clear()"
          class="absolute right-3 top-1/2 -translate-y-1/2 p-1 rounded-full hover:bg-bg-muted dark:hover:bg-gray-700 transition-colors"
          aria-label="Clear search"
        >
          <svg xmlns="http://www.w3.org/2000/svg" class="h-4 w-4 text-text-muted" 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>

      <app-search-query-assistant
        #assistant
        [context]="context"
        [currentQuery]="value"
        [anchorElement]="anchorElement"
        (queryChange)="onQueryChange($event)"
        (querySubmit)="onQuerySubmit($event)"
      />
    </div>
  `,
  styles: [`
    :host {
      display: block;
    }
  `]
})
export class SearchInputWithAssistantComponent implements AfterViewInit {
  @Input() placeholder: string = 'Search...';
  @Input() value: string = '';
  @Input() context: string = 'default';
  @Input() showSearchIcon: boolean = true;
  @Input() inputClass: string = 'w-full px-3 py-2 text-sm border border-border rounded-md bg-bg-primary text-text-main placeholder-text-muted focus:outline-none focus:ring-2 focus:ring-accent';

  @Output() valueChange = new EventEmitter<string>();
  @Output() submit = new EventEmitter<string>();

  @ViewChild('searchInput') searchInputRef?: ElementRef<HTMLInputElement>;
  @ViewChild('assistant') assistantRef?: SearchQueryAssistantComponent;

  anchorElement: HTMLElement | null = null;
  private historyService = inject(SearchHistoryService);

  constructor(private hostElement: ElementRef<HTMLElement>) {}

  ngAfterViewInit(): void {
    this.anchorElement = this.hostElement.nativeElement;
  }

  /**
   * Handle input changes
   */
  onInputChange(event: Event): void {
    const target = event.target as HTMLInputElement;
    this.value = target.value;
    this.valueChange.emit(this.value);
    
    // Update suggestions in assistant
    if (this.assistantRef) {
      this.assistantRef.currentQuery = this.value;
      this.assistantRef.updateOptions();
      this.assistantRef.updateSuggestions();
    }
  }

  /**
   * Handle focus event - open assistant
   */
  onFocus(): void {
    if (this.assistantRef) {
      this.assistantRef.open();
    }
  }

  /**
   * Handle blur event
   */
  onBlur(): void {
    // Delay close to allow clicking on popover items
    setTimeout(() => {
      if (this.assistantRef && !this.assistantRef.popoverRef) {
        // Only close if not interacting with popover
      }
    }, 200);
  }

  /**
   * Handle Enter key
   */
  onEnter(): void {
    // Save to history and submit
    if (this.value.trim()) {
      this.historyService.add(this.context, this.value);
    }
    this.submit.emit(this.value);
    if (this.assistantRef) {
      this.assistantRef.refreshHistoryView();
      this.assistantRef.close();
    }
  }

  /**
   * Handle query change from assistant
   */
  onQueryChange(query: string): void {
    this.value = query;
    this.valueChange.emit(query);

    if (this.searchInputRef) {
      this.searchInputRef.nativeElement.value = query;
    }

    if (this.assistantRef) {
      this.assistantRef.currentQuery = query;
      this.assistantRef.updateOptions();
      this.assistantRef.updateSuggestions();
    }
  }

  /**
   * Handle query submit from assistant
   */
  onQuerySubmit(query: string): void {
    this.value = query;
    if (query.trim()) {
      this.historyService.add(this.context, query);
    }
    this.submit.emit(query);

    if (this.searchInputRef) {
      this.searchInputRef.nativeElement.value = query;
      this.searchInputRef.nativeElement.focus();
    }

    if (this.assistantRef) {
      this.assistantRef.currentQuery = query;
      this.assistantRef.refreshHistoryView();
      this.assistantRef.close();
    }
  }

  /**
   * Clear the input
   */
  clear(): void {
    this.value = '';
    this.valueChange.emit('');
    if (this.searchInputRef) {
      this.searchInputRef.nativeElement.value = '';
      this.searchInputRef.nativeElement.focus();
    }
  }

  /**
   * Focus the input
   */
  focus(): void {
    if (this.searchInputRef) {
      this.searchInputRef.nativeElement.focus();
    }
  }
}