Implement creating new games

2021-04-27 16:37:48 +02:00
parent ee91f3d7f8
commit 5f9ac3d4a9
7 changed files with 360 additions and 2 deletions
--- a/pkg/gameCreator/gameCreator.go
+++ b/pkg/gameCreator/gameCreator.go
@@ -0,0 +1,120 @@
+package gameCreator
+
+import (
+	"encoding/csv"
+	"errors"
+	"io"
+	"strconv"
+	"time"
+)
+
+func CreateTemplate(w io.Writer, questions uint64, choicesPerQuestion uint64) (retE error) {
+	csvW := csv.NewWriter(w)
+	defer func() {
+		csvW.Flush()
+		if err := csvW.Error(); err != nil && retE != nil {
+			retE = err
+		}
+	}()
+
+	for i := uint64(0); i < questions; i++ {
+		var length string
+		if i == 0 {
+			length = "10000"
+		}
+		if err := csvW.Write([]string{"Nadpis otázky", length, ""}); err != nil {
+			return err
+		}
+		for j := uint64(0); j < choicesPerQuestion; j++ {
+			var correct string
+			if j == 0 {
+				correct = "1"
+			}
+			if err := csvW.Write([]string{"", "Nadpis možnosti", correct}); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+type Game struct {
+	Questions []Question
+}
+
+type Question struct {
+	Title   string
+	Choices []Choice
+	Length  uint64
+}
+
+type Choice struct {
+	Title   string
+	Correct bool
+}
+
+var ErrTooManyQuestions = errors.New("there were questions above the limit")
+var ErrTooManyChoices = errors.New("there were choices above the limit")
+var ErrInvalidSyntax = errors.New("")
+
+func Parse(r io.Reader, maxQuestions uint64, maxChoicesPerQuestion uint64) (Game, error) {
+	var g Game
+	var csvR = csv.NewReader(r)
+	csvR.FieldsPerRecord = 3
+	csvR.TrimLeadingSpace = true
+	var questions, choices uint64
+	for {
+		if row, err := csvR.Read(); err == nil {
+			if row[0] == "" && row[1] == "" && row[2] == "" {
+				continue
+			} else if row[0] == "" {
+				choices++
+				if questions == 0 {
+					return g, ErrInvalidSyntax
+				}
+				if choices > maxChoicesPerQuestion {
+					return g, ErrTooManyChoices
+				}
+				var correct bool
+				if row[2] == "1" {
+					correct = true
+				}
+				g.Questions[len(g.Questions)-1].Choices = append(g.Questions[len(g.Questions)-1].Choices, Choice{
+					Title:   row[1],
+					Correct: correct,
+				})
+			} else {
+				questions++
+				choices = 0
+				if questions > maxQuestions {
+					return g, ErrTooManyQuestions
+				}
+				var length uint64
+				if row[1] != "" {
+					if l, err := strconv.ParseUint(row[1], 10, 64); err == nil {
+						length = l
+					} else {
+						return g, ErrInvalidSyntax
+					}
+				} else {
+					if questions > 1 {
+						length = g.Questions[len(g.Questions)-1].Length
+					} else {
+						length = uint64((10 * time.Second).Milliseconds())
+					}
+				}
+				g.Questions = append(g.Questions, Question{
+					Title:  row[0],
+					Length: length,
+				})
+			}
+		} else if err == io.EOF {
+			break
+		} else if err == csv.ErrFieldCount {
+			return g, ErrInvalidSyntax
+		} else {
+			return g, err
+		}
+	}
+	return g, nil
+}