import { Component, EventEmitter, Output, inject, OnInit } from '@angular/core';
import { CommonModule } from '@angular/common';
import { HttpClient } from '@angular/common/http';

interface ActivityLog {
  id: number;
  timestamp: string;
  user: string;
  action: string;
  entity_type: string;
  entity_id: any;
  entity_name: string;
  details?: string;
}

@Component({
  selector: 'app-activity-log',
  standalone: true,
  imports: [CommonModule],
  template: `
    <div class="activity-log-dropdown" (click)="$event.stopPropagation()">
      <div class="activity-header">
        <h3>🔔 Recent Activities</h3>
        <button class="close-btn" (click)="close.emit()">×</button>
      </div>
      <div class="activity-list">
        @if (loading) {
          <div class="loading">Loading...</div>
        } @else if (activities.length === 0) {
          <div class="empty">No recent activities</div>
        } @else {
          @for (activity of activities; track activity.id) {
            <div class="activity-item">
              <div class="activity-time">{{ getRelativeTime(activity.timestamp) }}</div>
              <div class="activity-content">
                <strong>{{ activity.user }}</strong> {{ getActionText(activity) }}
                <em>{{ activity.entity_name }}</em>
              </div>
            </div>
          }
        }
      </div>
      <div class="activity-footer">
        <button class="btn btn-secondary" (click)="loadMore()">View All Activities</button>
      </div>
    </div>
  `,
  styles: [`
    .activity-log-dropdown {
      position: absolute;
      top: 100%;
      right: 0;
      width: 350px;
      background: white;
      border: 1px solid #dee2e6;
      border-radius: 8px;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      z-index: 1000;
      margin-top: 0.5rem;
    }

    .activity-header {
      padding: 1rem;
      border-bottom: 1px solid #dee2e6;
      display: flex;
      justify-content: space-between;
      align-items: center;

      h3 {
        margin: 0;
        font-size: 1.1rem;
      }

      .close-btn {
        background: none;
        border: none;
        font-size: 1.5rem;
        cursor: pointer;
        color: #6c757d;

        &:hover {
          color: #333;
        }
      }
    }

    .activity-list {
      max-height: 300px;
      overflow-y: auto;
    }

    .activity-item {
      padding: 0.75rem 1rem;
      border-bottom: 1px solid #f0f0f0;

      &:hover {
        background-color: #f8f9fa;
      }

      .activity-time {
        font-size: 0.85rem;
        color: #6c757d;
        margin-bottom: 0.25rem;
      }

      .activity-content {
        font-size: 0.9rem;

        em {
          color: #007bff;
          font-style: normal;
        }
      }
    }

    .activity-footer {
      padding: 0.75rem;
      border-top: 1px solid #dee2e6;
      text-align: center;
    }

    .loading, .empty {
      padding: 2rem;
      text-align: center;
      color: #6c757d;
    }
  `]
})
export class ActivityLogComponent implements OnInit {
  @Output() close = new EventEmitter<void>();

  private http = inject(HttpClient);

  activities: ActivityLog[] = [];
  loading = true;

  ngOnInit() {
    this.loadActivities();
  }

  loadActivities() {
    this.loading = true;
    this.http.get<ActivityLog[]>('/api/activity-log?limit=10')
      .subscribe({
        next: (data) => {
          this.activities = data;
          this.loading = false;
        },
        error: () => {
          this.loading = false;
        }
      });
  }

  loadMore() {
    // TODO: Implement full activity log view
    console.log('Load more activities');
  }

  getRelativeTime(timestamp: string): string {
    const date = new Date(timestamp);
    const now = new Date();
    const diff = now.getTime() - date.getTime();

    const minutes = Math.floor(diff / 60000);
    const hours = Math.floor(diff / 3600000);
    const days = Math.floor(diff / 86400000);

    if (minutes < 1) return 'just now';
    if (minutes < 60) return `${minutes} min ago`;
    if (hours < 24) return `${hours} hour${hours > 1 ? 's' : ''} ago`;
    return `${days} day${days > 1 ? 's' : ''} ago`;
  }

  getActionText(activity: ActivityLog): string {
    const actions: Record<string, string> = {
      'CREATE_PROJECT': 'created project',
      'UPDATE_PROJECT': 'updated project',
      'DELETE_PROJECT': 'deleted project',
      'PUBLISH_VERSION': 'published version',
      'CREATE_VERSION': 'created version',
      'UPDATE_VERSION': 'updated version',
      'CREATE_API': 'created API',
      'UPDATE_API': 'updated API',
      'DELETE_API': 'deleted API',
      'UPDATE_ENVIRONMENT': 'updated environment',
      'IMPORT_PROJECT': 'imported project'
    };

    return actions[activity.action] || activity.action.toLowerCase().replace('_', ' ');
  }
}