add CreatePlanet and put planet in solar system

services/gamesrv/gamesrv.go

@@ -0,0 +1,86 @@
+package gamesrv
+
+import (
+	"fmt"
+
+	"github.com/arnaucube/gogame/database"
+	"github.com/arnaucube/gogame/models"
+	"github.com/arnaucube/gogame/utils"
+	"gopkg.in/mgo.v2/bson"
+)
+
+type Service struct {
+	db *database.Db
+}
+
+func New(db *database.Db) *Service {
+	return &Service{
+		db,
+	}
+}
+
+// CreatePlanet is used when a user conquers a planet
+func (srv Service) CreatePlanet(userId bson.ObjectId) (*models.SolarSystem, *models.Planet, error) {
+	size := int64(250)   // TODO get rand inside a range
+	name := "planetname" // TODO get random name
+
+	newPlanet := models.Planet{
+		Size:    size,
+		Name:    name,
+		OwnerId: userId,
+	}
+	err := srv.db.Planets.Insert(newPlanet)
+	if err != nil {
+		return nil, nil, err
+	}
+	var planet *models.Planet
+	err = srv.db.Planets.Find(bson.M{"name": name}).One(&planet)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// now put the planet in a solar system
+	// get random solar system
+	systemPosition := utils.RandInRange(0, models.GALAXYSIZE)
+	solarSystem, err := srv.PutPlanetInSolarSystem(systemPosition, planet)
+	// TODO if error is returned because there is no empty slots for planets in the solar system in systemPosition, get another systemPosition and try again
+
+	return solarSystem, planet, err
+}
+
+func (srv Service) PutPlanetInSolarSystem(position int64, planet *models.Planet) (*models.SolarSystem, error) {
+	var solarSystem models.SolarSystem
+	err := srv.db.SolarSystems.Find(bson.M{"position": position}).One(&solarSystem)
+	if err != nil {
+		// solar system non existing yet
+		// create a solarsystem with empty planets
+		var emptyPlanets []bson.ObjectId
+		for i := 0; i < models.SOLARSYSTEMSIZE; i++ {
+			emptyPlanets = append(emptyPlanets, "")
+		}
+		newSolarSystem := models.SolarSystem{
+			Position: position,
+			Planets:  emptyPlanets[:15],
+		}
+		err = srv.db.SolarSystems.Insert(newSolarSystem)
+		if err != nil {
+			return nil, err
+		}
+		err := srv.db.SolarSystems.Find(bson.M{"position": position}).One(&solarSystem)
+
+		return &solarSystem, err
+	}
+	// get free slots in solarSystem
+	posInSolarSystem := utils.RandInRange(0, models.SOLARSYSTEMSIZE)
+	if solarSystem.Planets[posInSolarSystem] != "" {
+		// not empty slot, take another one TODO
+		// if there are no empty slots, return error
+		fmt.Println("not empty slot")
+	}
+	// store planet in solar system
+	solarSystem.Planets[posInSolarSystem] = planet.Id
+	err = srv.db.SolarSystems.Update(bson.M{"position": position}, solarSystem)
+
+	return &solarSystem, err
+
+}