import { KAT_COLORS } from './packingListPanel.constants'

// Stable color assignment: category name → index via simple hash
export function katColor(kat: string, allCategories?: string[]): string {
  const idx = allCategories ? allCategories.indexOf(kat) : -1
  if (idx >= 0) return KAT_COLORS[idx % KAT_COLORS.length]
  // Fallback: hash-based
  let h = 0
  for (let i = 0; i < kat.length; i++) h = ((h << 5) - h + kat.charCodeAt(i)) | 0
  return KAT_COLORS[Math.abs(h) % KAT_COLORS.length]
}

/** Weight an item contributes to a total: unit weight times quantity (defaults: 0 g, qty 1). */
export const itemWeight = (i: { weight_grams?: number | null; quantity?: number | null }): number =>
  (i.weight_grams || 0) * (i.quantity || 1)

// Parse CSV line respecting quoted values (e.g. "Shirt, blue" stays as one field)
export const parseCsvLine = (line: string): string[] => {
  const parts: string[] = []
  let current = ''
  let inQuotes = false
  for (let i = 0; i < line.length; i++) {
    const ch = line[i]
    if (ch === '"') { inQuotes = !inQuotes; continue }
    if (!inQuotes && (ch === ',' || ch === ';' || ch === '\t')) { parts.push(current.trim()); current = ''; continue }
    current += ch
  }
  parts.push(current.trim())
  return parts
}

export interface ParsedImportItem {
  name: string
  category: string | undefined
  weight_grams: string | undefined
  bag: string | undefined
  checked: boolean
}

export const parseImportLines = (text: string): ParsedImportItem[] => {
  return text.split('\n').map(line => line.trim()).filter(Boolean).map(line => {
    // Format: Category, Name, Weight (optional), Bag (optional), checked/unchecked (optional)
    const parts = parseCsvLine(line)
    if (parts.length >= 2) {
      const category = parts[0]
      const name = parts[1]
      const weight_grams = parts[2] || undefined
      const bag = parts[3] || undefined
      const checked = parts[4]?.toLowerCase() === 'checked' || parts[4] === '1'
      return { name, category, weight_grams, bag, checked }
    }
    // Single value = just a name
    return { name: parts[0], category: undefined, weight_grams: undefined, bag: undefined, checked: false }
  }).filter(i => i.name)
}