starter repo

internal/gamelogic/move.go

@@ -0,0 +1,92 @@
+package gamelogic
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+)
+
+type MoveOutcome int
+
+const (
+	MoveOutcomeSamePlayer MoveOutcome = iota
+	MoveOutComeSafe
+	MoveOutcomeMakeWar
+)
+
+func (gs *GameState) HandleMove(move ArmyMove) MoveOutcome {
+	defer fmt.Println("------------------------")
+	player := gs.GetPlayerSnap()
+
+	fmt.Println()
+	fmt.Println("==== Move Detected ====")
+	fmt.Printf("%s is moving %v unit(s) to %s\n", move.Player.Username, len(move.Units), move.ToLocation)
+	for _, unit := range move.Units {
+		fmt.Printf("* %v\n", unit.Rank)
+	}
+
+	if player.Username == move.Player.Username {
+		return MoveOutcomeSamePlayer
+	}
+
+	overlappingLocation := getOverlappingLocation(player, move.Player)
+	if overlappingLocation != "" {
+		fmt.Printf("You have units in %s! You are at war with %s!\n", overlappingLocation, move.Player.Username)
+		return MoveOutcomeMakeWar
+	}
+	fmt.Printf("You are safe from %s's units.\n", move.Player.Username)
+	return MoveOutComeSafe
+}
+
+func getOverlappingLocation(p1 Player, p2 Player) Location {
+	for _, u1 := range p1.Units {
+		for _, u2 := range p2.Units {
+			if u1.Location == u2.Location {
+				return u1.Location
+			}
+		}
+	}
+	return ""
+}
+
+func (gs *GameState) CommandMove(words []string) (ArmyMove, error) {
+	if gs.isPaused() {
+		return ArmyMove{}, errors.New("the game is paused, you can not move units")
+	}
+	if len(words) < 3 {
+		return ArmyMove{}, errors.New("usage: move <location> <unitID> <unitID> <unitID> etc")
+	}
+	newLocation := Location(words[1])
+	locations := getAllLocations()
+	if _, ok := locations[newLocation]; !ok {
+		return ArmyMove{}, fmt.Errorf("error: %s is not a valid location", newLocation)
+	}
+	unitIDs := []int{}
+	for _, word := range words[2:] {
+		id := word
+		unitID, err := strconv.Atoi(id)
+		if err != nil {
+			return ArmyMove{}, fmt.Errorf("error: %s is not a valid unit ID", id)
+		}
+		unitIDs = append(unitIDs, unitID)
+	}
+
+	newUnits := []Unit{}
+	for _, unitID := range unitIDs {
+		unit, ok := gs.GetUnit(unitID)
+		if !ok {
+			return ArmyMove{}, fmt.Errorf("error: unit with ID %v not found", unitID)
+		}
+		unit.Location = newLocation
+		gs.UpdateUnit(unit)
+		newUnits = append(newUnits, unit)
+	}
+
+	mv := ArmyMove{
+		ToLocation: newLocation,
+		Units:      newUnits,
+		Player:     gs.GetPlayerSnap(),
+	}
+	fmt.Printf("Moved %v units to %s\n", len(mv.Units), mv.ToLocation)
+	return mv, nil
+}