add competition service (it`s broken, I will fix it later)

internal/competition/domain/competition.go

@@ -0,0 +1,73 @@
+package domain
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/go-playground/validator/v10"
+	"github.com/google/uuid"
+)
+
+type CompetitionState string
+
+const (
+	CompetitionStateUnspecified CompetitionState = "UNSPECIFIED"
+	CompetitionStateDraft       CompetitionState = "DRAFT"
+	CompetitionStateNotStarted  CompetitionState = "NOT_STARTED"
+	CompetitionStateStarted     CompetitionState = "STARTED"
+	CompetitionStateFinished    CompetitionState = "FINISHED"
+	CompetitionStateArchived    CompetitionState = "ARCHIVED"
+)
+
+type ParticipationType string
+
+const (
+	ParticipationTypeUnspecified ParticipationType = "UNSPECIFIED"
+	ParticipationTypeIndividual  ParticipationType = "INDIVIDUAL"
+	ParticipationTypeTeam        ParticipationType = "TEAM"
+)
+
+type CompetitionType string
+
+const (
+	CompetitionTypeUnspecified CompetitionType = "UNSPECIFIED"
+	CompetitionTypeEducative   CompetitionType = "EDUCATIVE"
+	CompetitionTypeCompetitive CompetitionType = "COMPETITIVE"
+)
+
+type Competition struct {
+	ID                uuid.UUID
+	State             CompetitionState
+	Title             string
+	Description       string
+	ImageURL          *string
+	StartTime         time.Time
+	EndTime           time.Time
+	Type              CompetitionType
+	ParticipationType ParticipationType
+	CreatedAt         time.Time
+	UpdatedAt         time.Time
+}
+
+
+func NewCompetition(id uuid.UUID, state CompetitionState, title string, description string, imageURL *string, startTime time.Time, endTime time.Time, tpe CompetitionType, participationType ParticipationType, createdAt time.Time, updatedAt time.Time) *Competition {
+	return &Competition{
+		ID:                id,
+		State:             state,
+		Title:             title,
+		Description:       description,
+		ImageURL:          imageURL,
+		StartTime:         startTime,
+		EndTime:           endTime,
+		Type:              tpe,
+		ParticipationType: participationType,
+		CreatedAt:         createdAt,
+		UpdatedAt:         updatedAt,
+	}
+}
+
+func (c *Competition) Validate() error {
+	validate := validator.New()
+
+	return fmt.Errorf("%w: %w", ErrInvalidCompetitionData, validate.Struct(c))
+}