Student data parsing

process.go

@@ -1,4 +1,115 @@
 package main
 
-func main() {
+import (
+	"encoding/csv"
+	"flag"
+	"fmt"
+	"io"
+	"log/slog"
+	"os"
+	"slices"
+	"strings"
+)
+
+type Person struct {
+	FirstName string
+	LastName  string
+	Email     string
+}
+
+type Student struct {
+	Person
+	Class string
+	Grade string
+}
+
+func main() {
+	directoryPath := flag.String("directory", "", "path to directory CSV file")
+
+	flag.Parse()
+
+	l := slog.Default()
+
+	if *directoryPath == "" {
+		fatal(l, "please pass --directory")
+	}
+
+	_, err := loadDirectory(l, *directoryPath)
+	if err != nil {
+		fatal(l, "failed to load directory", "error", err)
+	}
+}
+
+func loadDirectory(l *slog.Logger, path string) (*string, error) {
+	fh, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+
+	r := csv.NewReader(fh)
+
+	headers, err := r.Read()
+	if err != nil {
+		return nil, err
+	}
+	l.Info("headers", "headers", headers)
+
+	iStudentFirstName := slices.Index(headers, "First Name")
+	if iStudentFirstName == -1 {
+		return nil, fmt.Errorf("'First Name' field missing")
+	}
+
+	iStudentLastName := slices.Index(headers, "Last Name")
+	if iStudentLastName == -1 {
+		return nil, fmt.Errorf("'Last Name' field missing")
+	}
+
+	iStudentClass := slices.Index(headers, "Class")
+	if iStudentClass == -1 {
+		return nil, fmt.Errorf("'Class' field missing")
+	}
+
+	iStudentGrade := slices.Index(headers, "Grade")
+	if iStudentClass == -1 {
+		return nil, fmt.Errorf("'Grade' field missing")
+	}
+
+	for {
+		row, err := r.Read()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			return nil, err
+		}
+
+		class := row[iStudentClass]
+		if strings.Contains(class, "/") {
+			class = ""
+		}
+
+		studentEmail := fmt.Sprintf(
+			"%s.%s@heliosschool.org",
+			strings.ToLower(row[iStudentFirstName]),
+			strings.ToLower(row[iStudentLastName]),
+		)
+
+		student := &Student{
+			Person: Person{
+				FirstName: row[iStudentFirstName],
+				LastName:  row[iStudentLastName],
+				Email: studentEmail,
+			},
+			Class: class,
+			Grade: row[iStudentGrade],
+		}
+
+		l.Info("row", "row", student)
+	}
+
+	return nil, nil
+}
+
+func fatal(l *slog.Logger, msg string, args ...any) {
+	l.Error(msg, args...)
+	os.Exit(1)
 }