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
  week: string[]; // Added Week filter
  stock: string[]; // Added Stock filter
  vendorStock: string[]; // Added Vendor Stock filter
  woc: string[]; // Added Weeks of Coverage filter
  bulkSearch: string; // Added Bulk Search support
}

export interface GrowthMetric {
  line: string;
  currentYearSellOut: number;
  previousYearSellOut: number;
  sellOutGrowthValue: number;
  sellOutGrowthPercentage: number;

  currentYearUnits: number;
  previousYearUnits: number;
  unitsGrowthValue: number;
  unitsGrowthPercentage: number;
}

export type LineGrowthMetric = GrowthMetric;

export interface ItemGrowthMetric {
  sku: string;
  asin: string;
  title: string;
  line: string;
  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: GrowthMetric[];
  bottomMovers: GrowthMetric[];
  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

  // Ads data (optional, aggregated by ASIN)
  adsByYear?: Record<string, {
    adSpend: number;
    attributedSales: number;
    acos: number;
    tacos: number;
  }>;
}

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"
}

export interface AdsRecord {
  country: string;       // Marketplace (Amazon DE, IT, ES, FR, UK)
  year: number;          // Year extracted from sheet name
  week: number;          // Week number (1-52)
  asin: string;
  cost: number;          // Ad spend €
  clicks: number;
  impressions: number;
  cpc: number;           // Cost per click €
  ctr: number;           // Click-through rate %
  acos: number;          // Advertising cost of sale %
  conversions: number;   // Attributed conversions (30d)
  attributedUnits30d: number;
  attributedSales30d: number;
}

export interface TrafficRecord {
  country: string;       // Marketplace (DE, UK, etc.)
  year: number;
  week: number;
  asin: string;
  glanceViews: number;   // Page views
}

export interface CombinedKPIs {
  id: string;
  marketplace: string;
  customer: string; // Added for consistency with SalesRecord
  month: string;
  week: number; // Added for weekly analysis
  year: number;
  asin: string;
  title: string;
  line: string;
  sku: string;

  salesTotal: number;
  unitsTotal: number;

  salesAds: number;
  unitsAds: number;
  cost: number;
  clicks: number;
  impressions: number;
  conversions: number;

  salesOrganic: number;
  unitsOrganic: number;

  paidSalesShare: number;
  organicSalesShare: number;

  acos: number;
  tacos: number;
  roas: number;
  ctr: number;
  cpc: number;
  cvrUnits: number;
  glanceViews: number;   // Traffic / page views
  avgWeeklySales?: number; // Added for Weeks of Coverage
}

export interface ForecastRecord {
  asin: string;
  annualForecast: number;
  sku?: string;
  title?: string;
  line?: string;
}

export interface MonthlyForecastPoint {
  month: string;
  forecastUnits: number;
  actualUnits: number;
}

export interface ProductForecastData {
  asin: string;
  sku: string;
  title: string;
  line: string;
  annualForecast: number;
  actualUnits: number;
  forecastUnits: number;
  accuracy: number;
  avgWeeklySales: number; // Added for Weeks of Coverage
  monthlyData: Record<string, MonthlyForecastPoint>;
}

export interface BuyBoxLostData {
  asin: string;
  countries: string[];  // ['DE', 'FR', 'IT', 'UK', 'ES']
  reasons: Record<string, string>;  // { DE: 'Amazon', FR: 'Unknown' }
}