ensure consistent ordering of data

main.go

@@ -36,10 +36,35 @@ type Record struct {
 	Wsdc json.RawMessage `json:"Western Sydney Data Centre"`
 }
 
+type KeyValue struct {
+	Key   string
+	Value interface{}
+}
+
+var sha1ver string   // sha1 revision used to build the program
+var buildTime string // when the executable was built
+
+// Add a new key-value pair to the slice
+func addData(data []KeyValue, key string, value interface{}) []KeyValue {
+	return append(data, KeyValue{Key: key, Value: value})
+}
+
+// Find a value by key
+func findData(data []KeyValue, key string) (interface{}, bool) {
+	for _, kv := range data {
+		if kv.Key == key {
+			return kv.Value, true
+		}
+	}
+	return nil, false // Return false if key not found
+}
+
 func GenerateAvgVcpusCharts(f *excelize.File, data any, name string) {
 	var err error
-	rydeAvgCpu := make(map[string]interface{})
-	wsdcAvgCpu := make(map[string]interface{})
+	//rydeAvgCpu := make(map[string]interface{})
+	rydeAvgCpu := []KeyValue{}
+	//wsdcAvgCpu := make(map[string]interface{})
+	wsdcAvgCpu := []KeyValue{}
 	var avgCpuColumns []string
 
 	// Access AvgCpu using reflection
@@ -75,8 +100,11 @@ func GenerateAvgVcpusCharts(f *excelize.File, data any, name string) {
 			}
 		}
 
-		rydeAvgCpu[fieldName] = rydeData
-		wsdcAvgCpu[fieldName] = wsdcData
+		rydeAvgCpu = addData(rydeAvgCpu, fieldName, rydeData)
+		wsdcAvgCpu = addData(wsdcAvgCpu, fieldName, wsdcData)
+
+		//rydeAvgCpu[fieldName] = rydeData
+		//wsdcAvgCpu[fieldName] = wsdcData
 		avgCpuColumns = append(avgCpuColumns, fieldName)
 	}
 
@@ -88,7 +116,8 @@ func GenerateAvgVcpusCharts(f *excelize.File, data any, name string) {
 
 func GenerateCharts(f *excelize.File, data any, name string, location string) {
 	var err error
-	parsedData := make(map[string]interface{})
+	//parsedData := make(map[string]interface{})
+	parsedData := []KeyValue{}
 	var dataColumns = []string{"RCC", "WSDC"}
 
 	// Create interfaces to hold unmarshaled data
@@ -117,21 +146,24 @@ func GenerateCharts(f *excelize.File, data any, name string, location string) {
 	}
 
 	// store the data together
-	parsedData["RCC"] = rcc
-	parsedData["WSDC"] = wsdc
+	parsedData = addData(parsedData, "RCC", rcc)
+	parsedData = addData(parsedData, "WSDC", wsdc)
+	//parsedData["RCC"] = rcc
+	//parsedData["WSDC"] = wsdc
 	//prettyPrint(parsedData)
 
 	// Generate worksheet and graph
 	AvgChart(f, name, location, dataColumns, parsedData)
 }
 
-func AvgChart(f *excelize.File, worksheetName string, location string, avgCpuColumns []string, data map[string]interface{}) {
+func AvgChart(f *excelize.File, worksheetName string, location string, avgCpuColumns []string, data []KeyValue) {
 	var err error
 	var chartSeries []excelize.ChartSeries
 	var dataDates []string
 	var col int
 	var row int
 
+	fmt.Printf("Creating worksheet %s\n", worksheetName)
 	_, err = f.NewSheet(worksheetName)
 	if err != nil {
 		log.Fatal(err)
@@ -144,12 +176,14 @@ func AvgChart(f *excelize.File, worksheetName string, location string, avgCpuCol
 		f.SetCellValue(worksheetName, cell, avgCpuColumns[i])
 	}
 
-	// Get the values for the dates column
+	// Get the values for the dates column using the first object in data
 	for _, v := range data {
-		for date := range v.(map[string]interface{}) {
-			dataDates = append(dataDates, date)
+		if dateMap, ok := v.Value.(map[string]interface{}); ok {
+			for date := range dateMap {
+				dataDates = append(dataDates, date)
+			}
 		}
-		break
+		break // Assuming you only need the dates from the first entry
 	}
 
 	// Sort dates using the custom function
@@ -165,22 +199,27 @@ func AvgChart(f *excelize.File, worksheetName string, location string, avgCpuCol
 		f.SetCellValue(worksheetName, cell, dataDates[i])
 	}
 
-	for pool, v := range data { // iterate each resource pool type
+	// Iterate over each KeyValue in the data slice (resource pool types)
+	for _, poolKv := range data {
+		pool := poolKv.Key // The pool name
+
 		// Find the column that matches, add one to account for the date column
 		col = slices.Index(avgCpuColumns, pool) + 1
-		//fmt.Printf("Pool: %s, column: %d\n", pool, col)
+		fmt.Printf("Pool: %s, column: %d\n", pool, col)
 
-		for date, val := range v.(map[string]interface{}) { // use type assertion to loop over map[string]interface{}
-			//fmt.Printf("val: %v\n", val)
+		// Type assertion to confirm that poolKv.Value is a map[string]interface{}
+		if dateMap, ok := poolKv.Value.(map[string]interface{}); ok {
+			for date, val := range dateMap {
+				fmt.Printf("Date: %s, Value: %v\n", date, val)
 
-			// Find the correct row, add one to account for sheet heading
-			row = slices.Index(dataDates, date) + 1
+				// Find the correct row, add one to account for sheet heading
+				row = slices.Index(dataDates, date) + 1
 
-			cell := string(rune('A'+col)) + strconv.Itoa(row+1)
-			//fmt.Printf("Adding value %f (%s) to %s]\n", val, date, cell)
-			f.SetCellValue(worksheetName, cell, val)
+				cell := string(rune('A'+col)) + strconv.Itoa(row+1)
+				//fmt.Printf("Adding value %f (%s) to %s]\n", val, date, cell)
+				f.SetCellValue(worksheetName, cell, val)
+			}
 		}
-
 		// Create the chartseries for this resource pool
 		thisChartSeries := excelize.ChartSeries{
 			Name:       "'" + worksheetName + "'!$" + string(rune('A'+col)) + "$1",                                                                  // Reference the cell containing the resource pool name, eg Tin in $B$1
@@ -220,6 +259,11 @@ func AvgChart(f *excelize.File, worksheetName string, location string, avgCpuCol
 		XAxis: excelize.ChartAxis{
 			MajorGridLines: true,
 			MinorGridLines: true,
+			Title: []excelize.RichTextRun{
+				{
+					Text: "Month Year",
+				},
+			},
 			Font: excelize.Font{
 				Color: "000000",
 			},
@@ -227,6 +271,11 @@ func AvgChart(f *excelize.File, worksheetName string, location string, avgCpuCol
 		YAxis: excelize.ChartAxis{
 			MajorGridLines: true,
 			MinorGridLines: true,
+			Title: []excelize.RichTextRun{
+				{
+					Text: "Count/Size",
+				},
+			},
 			Font: excelize.Font{
 				Color: "000000",
 			},
@@ -248,6 +297,9 @@ func main() {
 	outputFile := flag.String("output", "book1.xlsx", "The filename to use when writing excel workbook")
 	flag.Parse()
 
+	fmt.Println("Excel chart generation utility, written by Nathan Coad (nathan.coad@dell.com)")
+	fmt.Printf("Built on %s from sha1 %s\n", buildTime, sha1ver)
+
 	// Create the workbook
 	f := excelize.NewFile()
 	defer func() {