import { Component, OnInit } from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { MatDialog, MatDialogModule } from '@angular/material/dialog';
import { MatSnackBar, MatSnackBarModule } from '@angular/material/snack-bar';
import { MatTableModule } from '@angular/material/table';
import { MatProgressBarModule } from '@angular/material/progress-bar';
import { MatButtonModule } from '@angular/material/button';
import { MatCheckboxModule } from '@angular/material/checkbox';
import { MatFormFieldModule } from '@angular/material/form-field';
import { MatInputModule } from '@angular/material/input';
import { MatButtonToggleModule } from '@angular/material/button-toggle';
import { MatCardModule } from '@angular/material/card';
import { MatChipsModule } from '@angular/material/chips';
import { MatIconModule } from '@angular/material/icon';
import { MatMenuModule } from '@angular/material/menu';
import { MatDividerModule } from '@angular/material/divider';
import { ApiService, Project } from '../../services/api.service';
import ProjectEditDialogComponent from '../../dialogs/project-edit-dialog/project-edit-dialog.component';
import VersionEditDialogComponent from '../../dialogs/version-edit-dialog/version-edit-dialog.component';
import ConfirmDialogComponent from '../../dialogs/confirm-dialog/confirm-dialog.component';

@Component({
  selector: 'app-projects',
  standalone: true,
  imports: [
    CommonModule,
    FormsModule,
    MatTableModule,
    MatProgressBarModule,
    MatButtonModule,
    MatCheckboxModule,
    MatFormFieldModule,
    MatInputModule,
    MatButtonToggleModule,
    MatCardModule,
    MatChipsModule,
    MatIconModule,
    MatMenuModule,
    MatDividerModule,
    MatDialogModule,
    MatSnackBarModule
  ],
  templateUrl: './projects.component.html',
  styleUrls: ['./projects.component.scss']
})
export class ProjectsComponent implements OnInit {
  projects: Project[] = [];
  filteredProjects: Project[] = [];
  searchTerm = '';
  showDeleted = false;
  viewMode: 'list' | 'card' = 'card';
  loading = false;
  message = '';
  isError = false;
  
  // For table view
  displayedColumns: string[] = ['name', 'caption', 'versions', 'status', 'lastUpdate', 'actions'];

  constructor(
    private apiService: ApiService,
    private dialog: MatDialog,
    private snackBar: MatSnackBar
  ) {}

  ngOnInit() {
    this.loadProjects();
  }

  async loadProjects() {
    this.loading = true;
    try {
      this.projects = await this.apiService.getProjects(this.showDeleted).toPromise() || [];
      this.applyFilter();
    } catch (error) {
      this.showMessage('Failed to load projects', true);
    } finally {
      this.loading = false;
    }
  }

  applyFilter() {
    this.filteredProjects = this.projects.filter(project => {
      const matchesSearch = !this.searchTerm ||
        project.name.toLowerCase().includes(this.searchTerm.toLowerCase()) ||
        (project.caption || '').toLowerCase().includes(this.searchTerm.toLowerCase());

      const matchesDeleted = this.showDeleted || !project.deleted;

      return matchesSearch && matchesDeleted;
    });
  }

  filterProjects() {
    this.applyFilter();
  }

  onSearchChange() {
    this.applyFilter();
  }

  onShowDeletedChange() {
    this.loadProjects();
  }

  createProject() {
    const dialogRef = this.dialog.open(ProjectEditDialogComponent, {
      width: '500px',
      data: { mode: 'create' }
    });

    dialogRef.afterClosed().subscribe(result => {
      if (result) {
        this.loadProjects();
      }
    });
  }

  editProject(project: Project) {
    const dialogRef = this.dialog.open(ProjectEditDialogComponent, {
      width: '500px',
      data: { mode: 'edit', project: { ...project } }
    });

    dialogRef.afterClosed().subscribe(result => {
      if (result) {
        this.loadProjects();
      }
    });
  }

  async toggleProject(project: Project) {
    try {
      const result = await this.apiService.toggleProject(project.id).toPromise();
      project.enabled = result.enabled;
      this.showMessage(
        `Project "${project.name}" ${project.enabled ? 'enabled' : 'disabled'} successfully`,
        false
      );
    } catch (error) {
      this.showMessage('Failed to toggle project', true);
    }
  }

  manageVersions(project: Project) {
    const dialogRef = this.dialog.open(VersionEditDialogComponent, {
      width: '90vw',
      maxWidth: '1200px',
      height: '90vh',
      data: { project }
    });

    dialogRef.afterClosed().subscribe(result => {
      if (result) {
        this.loadProjects();
      }
    });
  }

  async deleteProject(project: Project) {
    const hasVersions = project.versions && project.versions.length > 0;
    const message = hasVersions ?
      `Project "${project.name}" has ${project.versions.length} version(s). Are you sure you want to delete it?` :
      `Are you sure you want to delete project "${project.name}"?`;

    const dialogRef = this.dialog.open(ConfirmDialogComponent, {
      width: '400px',
      data: {
        title: 'Delete Project',
        message: message,
        confirmText: 'Delete',
        confirmColor: 'warn'
      }
    });

    dialogRef.afterClosed().subscribe(async confirmed => {
      if (confirmed) {
        try {
          await this.apiService.deleteProject(project.id).toPromise();
          this.showMessage('Project deleted successfully', false);
          this.loadProjects();
        } catch (error: any) {
          const message = error.error?.detail || 'Failed to delete project';
          this.showMessage(message, true);
        }
      }
    });
  }

  async exportProject(project: Project) {
    try {
      const data = await this.apiService.exportProject(project.id).toPromise();

      // Create and download file
      const blob = new Blob([JSON.stringify(data, null, 2)], { type: 'application/json' });
      const url = window.URL.createObjectURL(blob);
      const link = document.createElement('a');
      link.href = url;
      link.download = `${project.name}_export_${new Date().getTime()}.json`;
      link.click();
      window.URL.revokeObjectURL(url);

      this.showMessage('Project exported successfully', false);
    } catch (error) {
      this.showMessage('Failed to export project', true);
    }
  }

  importProject() {
    const input = document.createElement('input');
    input.type = 'file';
    input.accept = '.json';

    input.onchange = async (event: any) => {
      const file = event.target.files[0];
      if (!file) return;

      try {
        const text = await file.text();
        const data = JSON.parse(text);

        await this.apiService.importProject(data).toPromise();
        this.showMessage('Project imported successfully', false);
        this.loadProjects();
      } catch (error: any) {
        const message = error.error?.detail || 'Failed to import project';
        this.showMessage(message, true);
      }
    };

    input.click();
  }

  getPublishedCount(project: Project): number {
    return project.versions?.filter(v => v.published).length || 0;
  }

  getRelativeTime(timestamp: string | undefined): string {
    if (!timestamp) return 'Never';

    const date = new Date(timestamp);
    const now = new Date();
    const diffMs = now.getTime() - date.getTime();
    const diffMins = Math.floor(diffMs / 60000);
    const diffHours = Math.floor(diffMs / 3600000);
    const diffDays = Math.floor(diffMs / 86400000);

    if (diffMins < 60) return `${diffMins} minutes ago`;
    if (diffHours < 24) return `${diffHours} hours ago`;
    if (diffDays < 7) return `${diffDays} days ago`;

    return date.toLocaleDateString();
  }

  trackByProjectId(index: number, project: Project): number {
    return project.id;
  }

  private showMessage(message: string, isError: boolean) {
    this.message = message;
    this.isError = isError;

    setTimeout(() => {
      this.message = '';
    }, 5000);
  }
}