cmd: break group

internal/model/game/group.go

@@ -122,6 +122,51 @@ func (g *Game) JoinEqualGroups(raceName string) error {
 	return nil
 }
 
+func (g *Game) BreakGroup(raceName string, groupIndex, quantity uint) error {
+	ri, err := g.raceIndex(raceName)
+	if err != nil {
+		return err
+	}
+	return g.breakGroupInternal(ri, groupIndex, quantity)
+}
+
+func (g *Game) breakGroupInternal(ri int, groupIndex, quantity uint) error {
+	sgi := -1
+	var maxIndex uint
+	for i, sg := range g.listIndexShipGroups(ri) {
+		if sgi < 0 && sg.Index == groupIndex {
+			sgi = i
+		}
+		if sg.Index > maxIndex {
+			maxIndex = sg.Index
+		}
+	}
+	if sgi < 0 {
+		return e.NewEntityNotExistsError("group #%d", groupIndex)
+	}
+
+	if g.ShipGroups[sgi].State != "In_Orbit" || g.ShipGroups[sgi].Origin != nil || g.ShipGroups[sgi].Range != nil {
+		return e.NewShipsBusyError()
+	}
+
+	if g.ShipGroups[sgi].Number < quantity {
+		return e.NewBeakGroupNumberNotEnoughError("%d<%d", g.ShipGroups[sgi].Number, quantity)
+	}
+
+	if quantity == 0 || quantity == g.ShipGroups[sgi].Number {
+		g.ShipGroups[sgi].FleetID = nil
+	} else {
+		newGroup := g.ShipGroups[sgi]
+		newGroup.Number = quantity
+		g.ShipGroups[sgi].Number -= quantity
+		newGroup.Index = maxIndex + 1
+		newGroup.FleetID = nil
+		g.ShipGroups = append(g.ShipGroups, newGroup)
+	}
+
+	return nil
+}
+
 func (g *Game) joinEqualGroupsInternal(ri int) {
 	shipGroups := slices.Collect(maps.Values(maps.Collect(g.listIndexShipGroups(ri))))
 	origin := len(shipGroups)

internal/model/game/group_test.go

@@ -346,3 +346,61 @@ func TestJoinEqualGroups(t *testing.T) {
 		}
 	}
 }
+
+func TestBreakGroup(t *testing.T) {
+	g := copyGame()
+	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Freighter, R0_Planet_0_num, 13)) // group #1 (0)
+	assert.NoError(t, g.CreateShips(Race_0_idx, Race_0_Gunship, R0_Planet_0_num, 7))    // group #2 (1) - In_Space
+	g.ShipGroups[1].State = "In_Space"
+
+	fleet := "R0_Fleet"
+	assert.NoError(t, g.JoinShipGroupToFleet(Race_0.Name, fleet, 1, 0))
+
+	assert.ErrorContains(t,
+		g.BreakGroup("UnknownRace", 1, 0),
+		e.GenericErrorText(e.ErrInputUnknownRace))
+	assert.ErrorContains(t,
+		g.BreakGroup(Race_0.Name, 555, 0),
+		e.GenericErrorText(e.ErrInputEntityNotExists))
+	assert.ErrorContains(t,
+		g.BreakGroup(Race_0.Name, 1, 17),
+		e.GenericErrorText(e.ErrBeakGroupNumberNotEnough))
+	assert.ErrorContains(t,
+		g.BreakGroup(Race_0.Name, 2, 0),
+		e.GenericErrorText(e.ErrShipsBusy))
+
+	assert.Len(t, slices.Collect(g.ListShipGroups(Race_0_idx)), 2)
+	assert.Len(t, slices.Collect(g.ListFleets(Race_0_idx)), 1)
+
+	// group #1 -> group #3 (5 new, 8 left)
+	assert.NoError(t, g.BreakGroup(Race_0.Name, 1, 5)) // group #3 (2)
+	assert.Len(t, slices.Collect(g.ListShipGroups(Race_0_idx)), 3)
+	assert.Equal(t, uint(8), g.ShipGroups[0].Number)
+	assert.NotNil(t, g.ShipGroups[0].FleetID)
+	assert.Equal(t, uint(5), g.ShipGroups[2].Number)
+	assert.Equal(t, uint(3), g.ShipGroups[2].Index)
+	assert.Nil(t, g.ShipGroups[2].FleetID)
+
+	// group #1 -> group #4 (2 new, 6 left)
+	assert.NoError(t, g.BreakGroup(Race_0.Name, 1, 2)) // group #4 (3)
+	assert.Len(t, slices.Collect(g.ListShipGroups(Race_0_idx)), 4)
+	assert.Equal(t, uint(6), g.ShipGroups[0].Number)
+	assert.NotNil(t, g.ShipGroups[0].FleetID)
+	assert.Equal(t, uint(2), g.ShipGroups[3].Number)
+	assert.Equal(t, uint(4), g.ShipGroups[3].Index)
+	assert.Nil(t, g.ShipGroups[3].FleetID)
+	assert.NoError(t, g.JoinShipGroupToFleet(Race_0.Name, fleet, 4, 0))
+	assert.NotNil(t, g.ShipGroups[3].FleetID)
+
+	// group #1 -> MAX 6 off the fleet
+	assert.NoError(t, g.BreakGroup(Race_0.Name, 1, 6)) // group #1 (0)
+	assert.Len(t, slices.Collect(g.ListShipGroups(Race_0_idx)), 4)
+	assert.Equal(t, uint(6), g.ShipGroups[0].Number)
+	assert.Nil(t, g.ShipGroups[0].FleetID)
+
+	// group #4 -> ALL off the fleet
+	assert.NoError(t, g.BreakGroup(Race_0.Name, 4, 0)) // group #1 (0)
+	assert.Len(t, slices.Collect(g.ListShipGroups(Race_0_idx)), 4)
+	assert.Equal(t, uint(2), g.ShipGroups[3].Number)
+	assert.Nil(t, g.ShipGroups[3].FleetID)
+}