support multi-module (#4)

* add multimodule
* re-package modules

server/internal/model/game/race.go

@@ -0,0 +1,62 @@
+package game
+
+import (
+	"strings"
+
+	"github.com/google/uuid"
+)
+
+type Relation string
+
+const (
+	RelationWar   Relation = "WAR"
+	RelationPeace Relation = "PEACE"
+)
+
+var (
+	relationSet = map[string]Relation{
+		strings.ToLower(RelationWar.String()):   RelationWar,
+		strings.ToLower(RelationPeace.String()): RelationPeace,
+	}
+)
+
+type Race struct {
+	ID        uuid.UUID      `json:"id"`
+	Name      string         `json:"name"`
+	TTL       uint           `json:"ttl"`
+	Extinct   bool           `json:"extinct"`
+	Votes     Float          `json:"votes"`
+	VoteFor   uuid.UUID      `json:"voteFor"`
+	Relations []RaceRelation `json:"relations"`
+	Tech      TechSet        `json:"tech"`
+	Sciences  []Science      `json:"science,omitempty"`
+	ShipTypes []ShipType     `json:"shipType,omitempty"`
+}
+
+func ParseRelation(v string) (Relation, bool) {
+	if v, ok := relationSet[strings.ToLower(v)]; ok {
+		return v, ok
+	}
+	return Relation(""), false
+}
+
+func (r Relation) String() string {
+	return string(r)
+}
+
+type RaceRelation struct {
+	RaceID   uuid.UUID `json:"raceId"`
+	Relation Relation  `json:"relation"`
+}
+
+func (r Race) TechLevel(t Tech) float64 {
+	return r.Tech.Value(t)
+}
+
+func (r Race) FlightDistance() float64 {
+	return r.TechLevel(TechDrive) * 40
+}
+
+func (r Race) VisibilityDistance() float64 {
+	return r.TechLevel(TechDrive) * 30
+}