first commit

backend/internal/repository/ops_repo_window_stats.go

@@ -0,0 +1,50 @@
+package repository
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/Wei-Shaw/sub2api/internal/service"
+)
+
+func (r *opsRepository) GetWindowStats(ctx context.Context, filter *service.OpsDashboardFilter) (*service.OpsWindowStats, error) {
+	if r == nil || r.db == nil {
+		return nil, fmt.Errorf("nil ops repository")
+	}
+	if filter == nil {
+		return nil, fmt.Errorf("nil filter")
+	}
+	if filter.StartTime.IsZero() || filter.EndTime.IsZero() {
+		return nil, fmt.Errorf("start_time/end_time required")
+	}
+
+	start := filter.StartTime.UTC()
+	end := filter.EndTime.UTC()
+	if start.After(end) {
+		return nil, fmt.Errorf("start_time must be <= end_time")
+	}
+	// Bound excessively large windows to prevent accidental heavy queries.
+	if end.Sub(start) > 24*time.Hour {
+		return nil, fmt.Errorf("window too large")
+	}
+
+	successCount, tokenConsumed, err := r.queryUsageCounts(ctx, filter, start, end)
+	if err != nil {
+		return nil, err
+	}
+
+	errorTotal, _, _, _, _, _, err := r.queryErrorCounts(ctx, filter, start, end)
+	if err != nil {
+		return nil, err
+	}
+
+	return &service.OpsWindowStats{
+		StartTime: start,
+		EndTime:   end,
+
+		SuccessCount:    successCount,
+		ErrorCountTotal: errorTotal,
+		TokenConsumed:   tokenConsumed,
+	}, nil
+}