/**
 * Hierarchy Grouping Utilities for Leadership Overview
 * 
 * Transforms flat project array into hierarchical structure:
 * Project Name -> Product Name -> Mold Items
 */

import { ProjectData } from '@/types/project';

export interface MoldItem {
  moldNumber: string;
  updateDate: string;
  progressDetails: string;
  currentNode: string;
  fullProject: ProjectData;
}

export interface ProductGroup {
  productName: string;
  molds: MoldItem[];
}

export interface ProjectGroup {
  projectName: string;
  products: ProductGroup[];
}

/**
 * Group flat projects array into hierarchical structure
 */
export function groupProjectsByHierarchy(projects: ProjectData[]): ProjectGroup[] {
  const projectMap = new Map<string, Map<string, MoldItem[]>>();
  
  // First pass: organize data
  projects.forEach(project => {
    const projectName = project.identity.projectName || 'Unknown Project';
    const productName = project.identity.productName || 'Unknown Product';
    const moldNumber = project.identity.moldNumber || 'N/A';
    
    if (!projectMap.has(projectName)) {
      projectMap.set(projectName, new Map());
    }
    
    const productMap = projectMap.get(projectName)!;
    if (!productMap.has(productName)) {
      productMap.set(productName, []);
    }
    
    productMap.get(productName)!.push({
      moldNumber,
      updateDate: project.details.detailDate,
      progressDetails: project.details.detailProgress,
      currentNode: project.milestones.currentNode,
      fullProject: project
    });
  });
  
  // Second pass: convert to array structure
  const result: ProjectGroup[] = [];
  
  projectMap.forEach((productMap, projectName) => {
    const products: ProductGroup[] = [];
    
    productMap.forEach((molds, productName) => {
      products.push({
        productName,
        molds: molds.sort((a, b) => a.moldNumber.localeCompare(b.moldNumber))
      });
    });
    
    result.push({
      projectName,
      products: products.sort((a, b) => a.productName.localeCompare(b.productName))
    });
  });
  
  return result.sort((a, b) => a.projectName.localeCompare(b.projectName));
}

/**
 * Check if date is older than 7 days
 */
export function isDateStale(dateStr: string): boolean {
  if (!dateStr || dateStr === '-') return false;
  
  try {
    // Handle Excel date format (e.g., "1/2/26" or "2026-01-02")
    const date = new Date(dateStr);
    if (isNaN(date.getTime())) return false;
    
    const now = new Date();
    const diffTime = now.getTime() - date.getTime();
    const diffDays = diffTime / (1000 * 60 * 60 * 24);
    
    return diffDays > 7;
  } catch {
    return false;
  }
}

/**
 * Format date for display (e.g., "1月2日")
 */
export function formatDateShort(dateStr: string): string {
  if (!dateStr || dateStr === '-') return '-';
  
  try {
    const date = new Date(dateStr);
    if (isNaN(date.getTime())) return dateStr;
    
    const month = date.getMonth() + 1;
    const day = date.getDate();
    return `${month}月${day}日`;
  } catch {
    return dateStr;
  }
}

/**
 * Get badge color class based on current node
 */
export function getNodeBadgeClass(node: string): string {
  const normalizedNode = node?.toUpperCase() || '';
  
  // Completed stages
  if (normalizedNode.includes('MP') || normalizedNode.includes('完成')) {
    return 'bg-green-100 text-green-700 border-green-300';
  }
  
  // In-progress stages
  if (normalizedNode.includes('PQR') || 
      normalizedNode.includes('T1') || 
      normalizedNode.includes('VMP') ||
      normalizedNode.includes('进行中')) {
    return 'bg-blue-100 text-blue-700 border-blue-300';
  }
  
  // Early stages
  if (normalizedNode.includes('KICK OFF') || normalizedNode.includes('G/L')) {
    return 'bg-slate-100 text-slate-700 border-slate-300';
  }
  
  // Default
  return 'bg-slate-100 text-slate-600 border-slate-300';
}