better stuffs

components/analytics/PredictionsChart.tsx

@@ -90,6 +90,8 @@ export default function PredictionsChart({
 
   const getConfidenceColor = (confidence: string) => {
     switch (confidence) {
+      case "very_high":
+        return "bg-emerald-600/20 text-emerald-700 dark:text-emerald-400 border-emerald-600/30";
       case "high":
         return "bg-green-500/10 text-green-700 dark:text-green-400";
       case "medium":
@@ -101,6 +103,21 @@ export default function PredictionsChart({
     }
   };
 
+  const getConfidenceLabel = (confidence: string) => {
+    switch (confidence) {
+      case "very_high":
+        return "Very High";
+      case "high":
+        return "High";
+      case "medium":
+        return "Medium";
+      case "low":
+        return "Low";
+      default:
+        return confidence;
+    }
+  };
+
   if (loading) {
     return (
       <Card>
@@ -212,14 +229,43 @@ export default function PredictionsChart({
                       <div className="text-2xl font-bold">
                         {formatGBP(predictions.sales.predicted)}
                       </div>
-                      <div className="flex items-center gap-2">
+                      <div className="flex items-center gap-2 flex-wrap">
                         <Badge
                           className={getConfidenceColor(
                             predictions.sales.confidence,
                           )}
                         >
-                          {predictions.sales.confidence} confidence
+                          {getConfidenceLabel(predictions.sales.confidence)} Confidence
+                          {predictions.sales.confidenceScore !== undefined && (
+                            <span className="ml-1 opacity-75">
+                              ({Math.round(predictions.sales.confidenceScore * 100)}%)
+                            </span>
+                          )}
                         </Badge>
+                        {predictions.sales.trend && (
+                          <Badge
+                            variant="outline"
+                            className={
+                              predictions.sales.trend.direction === "up"
+                                ? "text-green-600 border-green-600"
+                                : predictions.sales.trend.direction === "down"
+                                  ? "text-red-600 border-red-600"
+                                  : ""
+                            }
+                          >
+                            {predictions.sales.trend.direction === "up" && (
+                              <TrendingUp className="h-3 w-3 mr-1" />
+                            )}
+                            {predictions.sales.trend.direction === "down" && (
+                              <TrendingDown className="h-3 w-3 mr-1" />
+                            )}
+                            {predictions.sales.trend.direction === "up"
+                              ? "Trending Up"
+                              : predictions.sales.trend.direction === "down"
+                                ? "Trending Down"
+                                : "Stable"}
+                          </Badge>
+                        )}
                         <span className="text-xs text-muted-foreground">
                           Next {daysAhead} days
                         </span>
@@ -230,7 +276,38 @@ export default function PredictionsChart({
                           orders
                         </div>
                       )}
-                      {predictions.sales.minPrediction &&
+                      {predictions.sales.confidenceIntervals && (
+                        <div className="text-xs text-muted-foreground space-y-1">
+                          <div>
+                            Range: {formatGBP(predictions.sales.confidenceIntervals.lower)} -{" "}
+                            {formatGBP(predictions.sales.confidenceIntervals.upper)}
+                          </div>
+                          <div className="text-xs opacity-75">
+                            95% confidence interval
+                          </div>
+                          {predictions.sales.confidenceIntervals.confidenceScore !== undefined && (
+                            <div className="flex gap-3 text-xs opacity-75 mt-2 pt-2 border-t">
+                              {predictions.sales.confidenceIntervals.avgModelAccuracy !== undefined && (
+                                <div>
+                                  Model Accuracy: {Math.round(predictions.sales.confidenceIntervals.avgModelAccuracy * 100)}%
+                                </div>
+                              )}
+                              {predictions.sales.confidenceIntervals.modelAgreement !== undefined && (
+                                <div>
+                                  Agreement: {Math.round(predictions.sales.confidenceIntervals.modelAgreement * 100)}%
+                                </div>
+                              )}
+                              {predictions.sales.confidenceIntervals.dataConsistency !== undefined && (
+                                <div>
+                                  Data Quality: {Math.round(predictions.sales.confidenceIntervals.dataConsistency * 100)}%
+                                </div>
+                              )}
+                            </div>
+                          )}
+                        </div>
+                      )}
+                      {!predictions.sales.confidenceIntervals &&
+                        predictions.sales.minPrediction &&
                         predictions.sales.maxPrediction && (
                           <div className="text-xs text-muted-foreground">
                             Range: {formatGBP(predictions.sales.minPrediction)} -{" "}
@@ -266,7 +343,7 @@ export default function PredictionsChart({
                             predictions.demand.confidence,
                           )}
                         >
-                          {predictions.demand.confidence} confidence
+                          {getConfidenceLabel(predictions.demand.confidence)} Confidence
                         </Badge>
                       </div>
                       {predictions.demand.predictedWeekly && (
@@ -279,6 +356,12 @@ export default function PredictionsChart({
                           ~{predictions.demand.predictedMonthly.toFixed(0)} units/month
                         </div>
                       )}
+                      {predictions.demand.confidenceIntervals && (
+                        <div className="text-xs text-muted-foreground">
+                          Range: {predictions.demand.confidenceIntervals.lower.toFixed(1)} -{" "}
+                          {predictions.demand.confidenceIntervals.upper.toFixed(1)} units/day
+                        </div>
+                      )}
                     </div>
                   ) : (
                     <div className="text-sm text-muted-foreground">
@@ -369,19 +452,56 @@ export default function PredictionsChart({
                             {prediction.currentStock} {prediction.unitType}
                           </TableCell>
                           <TableCell>
-                            {prediction.prediction.daysUntilOutOfStock !== null
+                            {prediction.prediction.daysUntilOutOfStock !== null ? (
-                              ? `${prediction.prediction.daysUntilOutOfStock} days`
+                              <div className="space-y-1">
-                              : "N/A"}
+                                <div className="font-medium">
+                                  {prediction.prediction.daysUntilOutOfStock} days
+                                </div>
+                                {prediction.prediction.optimisticDays !== null &&
+                                  prediction.prediction.pessimisticDays && (
+                                    <div className="text-xs text-muted-foreground">
+                                      {prediction.prediction.optimisticDays} -{" "}
+                                      {prediction.prediction.pessimisticDays} days
+                                    </div>
+                                  )}
+                              </div>
+                            ) : (
+                              "N/A"
+                            )}
                           </TableCell>
                           <TableCell>
-                            {prediction.prediction.estimatedDate
+                            {prediction.prediction.estimatedDate ? (
-                              ? format(
+                              <div className="space-y-1">
+                                <div>
+                                  {format(
                                     new Date(
                                       prediction.prediction.estimatedDate,
                                     ),
                                     "MMM d, yyyy",
-                                )
+                                  )}
-                              : "N/A"}
+                                </div>
+                                {prediction.prediction.optimisticDate &&
+                                  prediction.prediction.pessimisticDate && (
+                                    <div className="text-xs text-muted-foreground">
+                                      {format(
+                                        new Date(
+                                          prediction.prediction.optimisticDate,
+                                        ),
+                                        "MMM d",
+                                      )}{" "}
+                                      -{" "}
+                                      {format(
+                                        new Date(
+                                          prediction.prediction.pessimisticDate,
+                                        ),
+                                        "MMM d",
+                                      )}
+                                    </div>
+                                  )}
+                              </div>
+                            ) : (
+                              "N/A"
+                            )}
                           </TableCell>
                           <TableCell>
                             <Badge
@@ -389,7 +509,7 @@ export default function PredictionsChart({
                                 prediction.prediction.confidence,
                               )}
                             >
-                              {prediction.prediction.confidence}
+                              {getConfidenceLabel(prediction.prediction.confidence)}
                             </Badge>
                           </TableCell>
                           <TableCell>

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;
+    weightedMovingAverage?: number | null;
-    exponentialAverage?: number | null;
+    exponentialSmoothing?: number | null;
-    linearRegression?: number | null;
+    holtWinters?: number | null;
-    trendAverage?: 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;