/**
 * Projects List Hook
 *
 * Provides data for the projects list page with filtering,
 * sorting, and pagination.
 *
 * Uses mock data until backend endpoints are available.
 *
 * @see Issue #54
 */

import { useQuery } from '@tanstack/react-query';
import type { ProjectStatus } from '@/components/projects/types';

// ============================================================================
// Types
// ============================================================================

export interface ProjectListItem {
  id: string;
  name: string;
  description?: string;
  status: ProjectStatus;
  complexity: 'low' | 'medium' | 'high';
  progress: number;
  openIssues: number;
  activeAgents: number;
  currentSprint?: string;
  lastActivity: string;
  createdAt: string;
  owner: {
    id: string;
    name: string;
  };
  tags?: string[];
}

export interface ProjectsListParams {
  search?: string;
  status?: ProjectStatus | 'all';
  complexity?: 'low' | 'medium' | 'high' | 'all';
  sortBy?: 'recent' | 'name' | 'progress' | 'issues';
  sortOrder?: 'asc' | 'desc';
  page?: number;
  limit?: number;
}

export interface ProjectsListResponse {
  data: ProjectListItem[];
  pagination: {
    page: number;
    limit: number;
    total: number;
    totalPages: number;
  };
}

// ============================================================================
// Mock Data
// ============================================================================

const mockProjects: ProjectListItem[] = [
  {
    id: 'proj-001',
    name: 'E-Commerce Platform Redesign',
    description: 'Complete redesign of the e-commerce platform with modern UI/UX and improved checkout flow',
    status: 'active',
    complexity: 'high',
    progress: 67,
    openIssues: 12,
    activeAgents: 4,
    currentSprint: 'Sprint 3',
    lastActivity: '2 minutes ago',
    createdAt: '2025-11-15T10:00:00Z',
    owner: { id: 'user-001', name: 'Felipe Cardoso' },
    tags: ['e-commerce', 'frontend', 'ux'],
  },
  {
    id: 'proj-002',
    name: 'Mobile Banking App',
    description: 'Native mobile app for banking services with biometric authentication and real-time notifications',
    status: 'active',
    complexity: 'high',
    progress: 45,
    openIssues: 8,
    activeAgents: 5,
    currentSprint: 'Sprint 2',
    lastActivity: '15 minutes ago',
    createdAt: '2025-11-20T09:00:00Z',
    owner: { id: 'user-001', name: 'Felipe Cardoso' },
    tags: ['mobile', 'fintech', 'security'],
  },
  {
    id: 'proj-003',
    name: 'Internal HR Portal',
    description: 'Employee self-service portal for HR operations including leave requests and performance reviews',
    status: 'paused',
    complexity: 'medium',
    progress: 23,
    openIssues: 5,
    activeAgents: 0,
    currentSprint: 'Sprint 1',
    lastActivity: '2 days ago',
    createdAt: '2025-10-01T08:00:00Z',
    owner: { id: 'user-002', name: 'Maria Santos' },
    tags: ['internal', 'hr', 'portal'],
  },
  {
    id: 'proj-004',
    name: 'API Gateway Modernization',
    description: 'Migrate legacy API gateway to cloud-native architecture with improved rate limiting and caching',
    status: 'active',
    complexity: 'high',
    progress: 82,
    openIssues: 3,
    activeAgents: 2,
    currentSprint: 'Sprint 4',
    lastActivity: '1 hour ago',
    createdAt: '2025-12-01T11:00:00Z',
    owner: { id: 'user-001', name: 'Felipe Cardoso' },
    tags: ['api', 'cloud', 'infrastructure'],
  },
  {
    id: 'proj-005',
    name: 'Customer Analytics Dashboard',
    description: 'Real-time analytics dashboard for customer behavior insights with ML-powered predictions',
    status: 'completed',
    complexity: 'medium',
    progress: 100,
    openIssues: 0,
    activeAgents: 0,
    lastActivity: '2 weeks ago',
    createdAt: '2025-09-01T10:00:00Z',
    owner: { id: 'user-003', name: 'Alex Johnson' },
    tags: ['analytics', 'ml', 'dashboard'],
  },
  {
    id: 'proj-006',
    name: 'DevOps Pipeline Automation',
    description: 'Automate CI/CD pipelines with AI-assisted deployments and rollback capabilities',
    status: 'active',
    complexity: 'medium',
    progress: 35,
    openIssues: 6,
    activeAgents: 3,
    currentSprint: 'Sprint 1',
    lastActivity: '30 minutes ago',
    createdAt: '2025-12-10T14:00:00Z',
    owner: { id: 'user-001', name: 'Felipe Cardoso' },
    tags: ['devops', 'automation', 'ci-cd'],
  },
  {
    id: 'proj-007',
    name: 'Inventory Management System',
    description: 'Warehouse inventory tracking with barcode scanning and automated reordering',
    status: 'archived',
    complexity: 'low',
    progress: 100,
    openIssues: 0,
    activeAgents: 0,
    lastActivity: '1 month ago',
    createdAt: '2025-06-15T08:00:00Z',
    owner: { id: 'user-002', name: 'Maria Santos' },
    tags: ['inventory', 'warehouse', 'logistics'],
  },
  {
    id: 'proj-008',
    name: 'Customer Support Chatbot',
    description: 'AI-powered chatbot for 24/7 customer support with sentiment analysis',
    status: 'active',
    complexity: 'medium',
    progress: 58,
    openIssues: 4,
    activeAgents: 2,
    currentSprint: 'Sprint 2',
    lastActivity: '45 minutes ago',
    createdAt: '2025-12-05T09:00:00Z',
    owner: { id: 'user-003', name: 'Alex Johnson' },
    tags: ['ai', 'chatbot', 'support'],
  },
];

// ============================================================================
// Hook
// ============================================================================

/**
 * Fetches projects list with filtering, sorting, and pagination
 */
export function useProjects(params: ProjectsListParams = {}) {
  const {
    search = '',
    status = 'all',
    complexity = 'all',
    sortBy = 'recent',
    sortOrder = 'desc',
    page = 1,
    limit = 50,
  } = params;

  return useQuery<ProjectsListResponse>({
    queryKey: ['projects', { search, status, complexity, sortBy, sortOrder, page, limit }],
    queryFn: async () => {
      // Simulate network delay
      await new Promise((resolve) => setTimeout(resolve, 400));

      // Filter projects
      let filtered = [...mockProjects];

      // Search filter
      if (search) {
        const searchLower = search.toLowerCase();
        filtered = filtered.filter(
          (p) =>
            p.name.toLowerCase().includes(searchLower) ||
            p.description?.toLowerCase().includes(searchLower) ||
            p.tags?.some((t) => t.toLowerCase().includes(searchLower))
        );
      }

      // Status filter
      if (status !== 'all') {
        filtered = filtered.filter((p) => p.status === status);
      }

      // Complexity filter
      if (complexity !== 'all') {
        filtered = filtered.filter((p) => p.complexity === complexity);
      }

      // Sort
      filtered.sort((a, b) => {
        let comparison = 0;
        switch (sortBy) {
          case 'name':
            comparison = a.name.localeCompare(b.name);
            break;
          case 'progress':
            comparison = a.progress - b.progress;
            break;
          case 'issues':
            comparison = a.openIssues - b.openIssues;
            break;
          case 'recent':
          default:
            comparison = new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime();
            break;
        }
        return sortOrder === 'asc' ? comparison : -comparison;
      });

      // Pagination
      const total = filtered.length;
      const totalPages = Math.ceil(total / limit);
      const start = (page - 1) * limit;
      const end = start + limit;
      const paginatedData = filtered.slice(start, end);

      return {
        data: paginatedData,
        pagination: {
          page,
          limit,
          total,
          totalPages,
        },
      };
    },
    staleTime: 30000,
  });
}