add struct

internal/calories/calories.go

@@ -0,0 +1,49 @@
+package calories
+
+import (
+	"strconv"
+	"strings"
+)
+
+var (
+	productsMap = map[string]struct {
+		caloriesIn100G int
+		awgWeightG     int
+	}{
+		"чай":    {caloriesIn100G: 65, awgWeightG: 200},
+		"яблоко": {caloriesIn100G: 52, awgWeightG: 242},
+		"хлеб":   {caloriesIn100G: 245, awgWeightG: 35},
+	}
+)
+
+func CalcCalories(text string) (int, error) {
+	product, ok := productsMap[strings.ToLower(text)]
+	if ok {
+		return product.caloriesIn100G * product.awgWeightG / 100, nil
+	}
+	arr := strings.Split(text, " ")
+	if len(arr) == 2 {
+		product, ok := productsMap[strings.ToLower(arr[0])]
+		if ok {
+			count, err := strconv.Atoi(arr[1])
+			if err != nil {
+				return 0, nil
+			}
+			return product.caloriesIn100G * count / 100, nil
+		}
+		count1, err := strconv.Atoi(arr[0])
+		if err != nil {
+			return 0, nil
+		}
+		count2, err := strconv.Atoi(arr[1])
+		if err != nil {
+			return 0, nil
+		}
+		return count1 * count2 / 100, nil
+	}
+	count, err := strconv.Atoi(text)
+	if err != nil {
+		return 0, nil
+	}
+	return count, nil
+}

internal/calories/calories_test.go

@@ -0,0 +1,65 @@
+package calories
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestCalcCalories(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		name    string
+		text    string
+		want    int
+		wantErr bool
+	}{
+		{
+			"empty text",
+			"",
+			0,
+			false,
+		},
+		{
+			"1 text",
+			"1",
+			1,
+			false,
+		},
+		{
+			"2 5 text",
+			"20 50",
+			10,
+			false,
+		},
+		{
+			"чай text",
+			"чай",
+			130,
+			false,
+		},
+		{
+			"чай 250 text",
+			"чай 250",
+			162,
+			false,
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			count, err := CalcCalories(tt.text)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("error calc calories: %v", err)
+				return
+			}
+			if count != tt.want {
+				fmt.Println(count, tt.want)
+				fmt.Println(count, tt.want)
+				t.Errorf("error count: %v", err)
+				return
+			}
+		})
+	}
+}