import { Component, OnInit, OnDestroy } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { ArtifactService } from '../../services/artifact';
import { Artifact } from '../../models/artifact.model';
import { interval, Subscription } from 'rxjs';
import { switchMap } from 'rxjs/operators';
import { LucideAngularModule, RefreshCw, Search, X, Download, Trash2, Sparkles } from 'lucide-angular';

@Component({
  selector: 'app-artifacts-list',
  standalone: true,
  imports: [CommonModule, FormsModule, LucideAngularModule],
  templateUrl: './artifacts-list.html',
  styleUrls: ['./artifacts-list.css']
})
export class ArtifactsListComponent implements OnInit, OnDestroy {
  artifacts: Artifact[] = [];
  filteredArtifacts: Artifact[] = [];
  selectedArtifact: Artifact | null = null;
  searchTerm: string = '';

  // Pagination
  currentPage: number = 1;
  pageSize: number = 25;

  // Auto-refresh
  autoRefreshEnabled: boolean = true;
  private refreshSubscription?: Subscription;
  private readonly REFRESH_INTERVAL = 5000; // 5 seconds

  // Sorting
  sortColumn: string | null = null;
  sortDirection: 'asc' | 'desc' = 'asc';

  loading: boolean = false;
  error: string | null = null;

  // Lucide icons
  readonly RefreshCw = RefreshCw;
  readonly Search = Search;
  readonly X = X;
  readonly Download = Download;
  readonly Trash2 = Trash2;
  readonly Sparkles = Sparkles;

  constructor(private artifactService: ArtifactService) {}

  ngOnInit() {
    this.loadArtifacts();
    this.startAutoRefresh();
  }

  ngOnDestroy() {
    this.stopAutoRefresh();
  }

  loadArtifacts() {
    this.loading = true;
    this.error = null;

    const offset = (this.currentPage - 1) * this.pageSize;
    this.artifactService.listArtifacts(this.pageSize, offset).subscribe({
      next: (artifacts) => {
        this.artifacts = artifacts;
        this.applyFilter();
        this.loading = false;
      },
      error: (err) => {
        this.error = 'Failed to load artifacts: ' + err.message;
        this.loading = false;
      }
    });
  }

  applyFilter() {
    if (!this.searchTerm) {
      this.filteredArtifacts = [...this.artifacts];
    } else {
      const term = this.searchTerm.toLowerCase();
      this.filteredArtifacts = this.artifacts.filter(artifact =>
        artifact.filename.toLowerCase().includes(term) ||
        (artifact.test_name && artifact.test_name.toLowerCase().includes(term)) ||
        (artifact.test_suite && artifact.test_suite.toLowerCase().includes(term)) ||
        (artifact.sim_source_id && artifact.sim_source_id.toLowerCase().includes(term))
      );
    }

    if (this.sortColumn) {
      this.applySorting();
    }
  }

  onSearch() {
    this.applyFilter();
  }

  clearSearch() {
    this.searchTerm = '';
    this.applyFilter();
  }

  sortTable(column: string) {
    if (this.sortColumn === column) {
      this.sortDirection = this.sortDirection === 'asc' ? 'desc' : 'asc';
    } else {
      this.sortColumn = column;
      this.sortDirection = 'asc';
    }
    this.applySorting();
  }

  applySorting() {
    if (!this.sortColumn) return;

    this.filteredArtifacts.sort((a, b) => {
      const aVal = (a as any)[this.sortColumn!] || '';
      const bVal = (b as any)[this.sortColumn!] || '';

      let comparison = 0;
      if (this.sortColumn === 'created_at') {
        comparison = new Date(aVal).getTime() - new Date(bVal).getTime();
      } else {
        comparison = String(aVal).localeCompare(String(bVal));
      }

      return this.sortDirection === 'asc' ? comparison : -comparison;
    });
  }

  previousPage() {
    if (this.currentPage > 1) {
      this.currentPage--;
      this.loadArtifacts();
    }
  }

  nextPage() {
    this.currentPage++;
    this.loadArtifacts();
  }

  toggleAutoRefresh() {
    this.autoRefreshEnabled = !this.autoRefreshEnabled;
    if (this.autoRefreshEnabled) {
      this.startAutoRefresh();
    } else {
      this.stopAutoRefresh();
    }
  }

  private startAutoRefresh() {
    if (!this.autoRefreshEnabled) return;

    this.refreshSubscription = interval(this.REFRESH_INTERVAL)
      .pipe(switchMap(() => this.artifactService.listArtifacts(this.pageSize, (this.currentPage - 1) * this.pageSize)))
      .subscribe({
        next: (artifacts) => {
          this.artifacts = artifacts;
          this.applyFilter();
        },
        error: (err) => console.error('Auto-refresh error:', err)
      });
  }

  private stopAutoRefresh() {
    if (this.refreshSubscription) {
      this.refreshSubscription.unsubscribe();
    }
  }

  showDetail(artifact: Artifact) {
    this.selectedArtifact = artifact;
  }

  closeDetail() {
    this.selectedArtifact = null;
  }

  downloadArtifact(artifact: Artifact, event: Event) {
    event.stopPropagation();
    this.artifactService.downloadArtifact(artifact.id).subscribe({
      next: (blob) => {
        const url = window.URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = artifact.filename;
        document.body.appendChild(a);
        a.click();
        window.URL.revokeObjectURL(url);
        document.body.removeChild(a);
      },
      error: (err) => alert('Download failed: ' + err.message)
    });
  }

  deleteArtifact(artifact: Artifact, event: Event) {
    event.stopPropagation();
    if (!confirm(`Are you sure you want to delete ${artifact.filename}? This cannot be undone.`)) {
      return;
    }

    this.artifactService.deleteArtifact(artifact.id).subscribe({
      next: () => {
        this.loadArtifacts();
        if (this.selectedArtifact?.id === artifact.id) {
          this.closeDetail();
        }
      },
      error: (err) => alert('Delete failed: ' + err.message)
    });
  }

  generateSeedData() {
    const count = prompt('How many artifacts to generate? (1-100)', '10');
    if (!count) return;

    const num = parseInt(count);
    if (isNaN(num) || num < 1 || num > 100) {
      alert('Please enter a number between 1 and 100');
      return;
    }

    this.artifactService.generateSeedData(num).subscribe({
      next: (result) => {
        alert(result.message);
        this.loadArtifacts();
      },
      error: (err) => alert('Generation failed: ' + err.message)
    });
  }

  formatBytes(bytes: number): string {
    if (bytes === 0) return '0 B';
    const k = 1024;
    const sizes = ['B', 'KB', 'MB', 'GB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i];
  }

  formatDate(dateString: string): string {
    return new Date(dateString).toLocaleString();
  }
}