better stuffs

lib/services/analytics-service.ts

@@ -308,17 +308,42 @@ export interface SalesPrediction {
     predicted: number;
     date: string;
   }>;
-  confidence: "high" | "medium" | "low";
+  confidence: "very_high" | "high" | "medium" | "low";
   method: string;
   methods?: {
-    movingAverage?: number | null;
-    exponentialAverage?: number | null;
-    linearRegression?: number | null;
-    trendAverage?: number | null;
+    weightedMovingAverage?: number | null;
+    exponentialSmoothing?: number | null;
+    holtWinters?: number | null;
+    weightedLinearRegression?: number | null;
+    trendAdjusted?: number | null;
+  };
+  trend?: {
+    direction: "up" | "down" | "neutral";
+    strength: number;
+    acceleration: number;
+    slope?: number;
   };
   variance?: number;
   minPrediction?: number;
   maxPrediction?: number;
+  confidenceScore?: number;
+  confidenceIntervals?: {
+    lower: number;
+    upper: number;
+    confidenceScore?: number;
+    modelAgreement?: number;
+    avgModelAccuracy?: number;
+    dataConsistency?: number;
+  };
+  modelPerformance?: {
+    [key: string]: {
+      mae?: number;
+      mape?: number;
+      rmse?: number;
+      accuracy?: number;
+      confidence?: string;
+    };
+  };
   seasonality?: {
     dayOfWeek: Record<string, number>;
     month: Record<string, number>;
@@ -333,10 +358,18 @@ export interface DemandPrediction {
   predictedDaily: number | null;
   predictedWeekly: number | null;
   predictedMonthly: number | null;
-  confidence: "high" | "medium" | "low";
+  confidence: "very_high" | "high" | "medium" | "low";
   averageDaily?: number;
   trendFactor?: number;
   stdDev?: number;
+  confidenceIntervals?: {
+    lower: number;
+    upper: number;
+    confidenceScore?: number;
+    modelAgreement?: number;
+    avgModelAccuracy?: number;
+    dataConsistency?: number;
+  };
   historicalPeriod: number;
   predictionPeriod: number;
   productId?: string | null;
@@ -352,9 +385,13 @@ export interface StockPrediction {
   prediction: {
     daysUntilOutOfStock: number | null;
     estimatedDate: string | null;
-    confidence: "high" | "medium" | "low";
+    confidence: "very_high" | "high" | "medium" | "low";
     averageDailySales?: number;
     stdDev?: number;
+    optimisticDays?: number | null;
+    pessimisticDays?: number | null;
+    optimisticDate?: string | null;
+    pessimisticDate?: string | null;
     message?: string;
   };
   needsRestock: boolean;