export interface SalesRecord {
  id: string;
  customer: string;
  year: number;
  month: string; // "Apr-23"
  week?: number;
  asin: string;
  sku: string;
  title: string; // Added Product Title
  articleName: string; // Kept for backward compatibility if mixed files used
  units: number;
  sellOut: number; // Parsed numeric value
  line: string;
}

export interface FilterState {
  customer: string[];
  year: string[];
  month: string[];
  line: string[];
  asin: string[];
  sku: string[];
  title: string[]; // Added Title filter
}

export interface LineGrowthMetric { // Renamed from GrowthMetric
  line: string;
  currentYearSellOut: number;
  previousYearSellOut: number;
  sellOutGrowthValue: number;
  sellOutGrowthPercentage: number;
  
  currentYearUnits: number;
  previousYearUnits: number;
  unitsGrowthValue: number;
  unitsGrowthPercentage: number;
}

export interface ItemGrowthMetric {
  sku: string;
  asin: string;
  title: string;
  line: string; // Keep line for context
  currentYearSellOut: number;
  previousYearSellOut: number;
  sellOutGrowthValue: number;
  sellOutGrowthPercentage: number;
  
  currentYearUnits: number;
  previousYearUnits: number;
  unitsGrowthValue: number;
  unitsGrowthPercentage: number;
}


export interface SeasonalityPoint {
  name: string; // "Jan", "Feb", etc.
  [year: string]: number | string; // Dynamic keys for years: "2023": 500, "2024": 600
}

export interface YearlySplitData {
  name: string;
  // Dynamic keys like "2023", "2024" or "2023_value", "2023_units"
  [key: string]: number | string; 
}

export interface AggregatedData {
  totalSellOut: number;
  totalUnits: number;
  totalsByYear: Record<string, { sellOut: number; units: number }>;
  byLine: { name: string; value: number; units: number }[];
  byCustomer: { name: string; value: number }[];
  seasonality: SeasonalityPoint[];
  seasonalityUnits: SeasonalityPoint[];
  availableYears: string[];
  topMovers: LineGrowthMetric[]; // Now uses LineGrowthMetric
  bottomMovers: LineGrowthMetric[]; // Now uses LineGrowthMetric
  comparisonPeriods: { current: string; previous: string };
  topLinesSplit: YearlySplitData[];
  byCustomerSplit: YearlySplitData[];
  byLineOverviewSplit: YearlySplitData[];
}

export interface ChatMessage {
  role: 'user' | 'model';
  text: string;
  timestamp: Date;
}

// New Interfaces for Dynamic Pivot Grid
export interface YearlyData {
    sellOut: number;
    units: number;
}

export interface MonthlyPivot {
    monthIndex: number;
    byYear: Record<string, YearlyData>;
}

export interface PivotRow {
    id: string;
    customer: string;
    line: string;
    title: string; // Added Title
    articleName: string;
    sku: string;
    asin: string;
    
    // Dynamic buckets
    totalsByYear: Record<string, YearlyData>; 
    months: MonthlyPivot[]; // Always 12 elements
}

export interface TimeSeriesData {
  name: string; // e.g., "Apr '23" or "W21 '23"
  sellOut: number;
  units: number;
}

export interface ComparisonTimeSeriesPoint {
  week: number;
  name: string; // "W1", "W2", etc.
  [key: string]: number | string; // Dynamic keys like "2023_sellOut", "2024_units"
}