feat: add package base price fallbacks

internal/repository/paket_test.go

@@ -94,3 +94,62 @@ func TestPaketItemBasePriceFallbackParity(t *testing.T) {
 		})
 	}
 }
+
+func TestPaketServiceBasePriceFallbackParity(t *testing.T) {
+	tests := []struct {
+		name                 string
+		tariffPrice          sql.NullFloat64
+		defaultPrice         float64
+		serviceCode          string
+		administrationPrice  float64
+		administrationSource string
+		expectedPrice        float64
+		expectedSource       string
+	}{
+		{
+			name:         "positive period tariff has highest priority",
+			tariffPrice:  sql.NullFloat64{Float64: 150000, Valid: true},
+			defaultPrice: 100000, serviceCode: "LAB001",
+			expectedPrice: 150000, expectedSource: "TARIF_PERIODE",
+		},
+		{
+			name:         "zero period tariff does not override master default",
+			tariffPrice:  sql.NullFloat64{Float64: 0, Valid: true},
+			defaultPrice: 100000, serviceCode: "LAB001",
+			expectedPrice: 100000, expectedSource: "MASTER_DEFAULT",
+		},
+		{
+			name:        "AN001 uses administration period fallback",
+			serviceCode: "an001", administrationPrice: 75000,
+			administrationSource: "ADM_PERIODE",
+			expectedPrice:        75000, expectedSource: "ADM_PERIODE",
+		},
+		{
+			name:        "AD001 uses registration master fallback",
+			serviceCode: " AD001 ", administrationPrice: 50000,
+			administrationSource: "BIAYA_ADMIN",
+			expectedPrice:        50000, expectedSource: "BIAYA_ADMIN",
+		},
+		{
+			name:        "non administration service does not use administration fallback",
+			serviceCode: "LAB001", administrationPrice: 50000,
+			administrationSource: "BIAYA_ADMIN",
+			expectedPrice:        0, expectedSource: "NOT_AVAILABLE",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			price, source := paketServiceBasePrice(
+				test.tariffPrice,
+				test.defaultPrice,
+				test.serviceCode,
+				test.administrationPrice,
+				test.administrationSource,
+			)
+			if price != test.expectedPrice || source != test.expectedSource {
+				t.Fatalf("price=%v source=%q want price=%v source=%q", price, source, test.expectedPrice, test.expectedSource)
+			}
+		})
+	}
+}