feat(game): implement MatchManager for game rules and state

internal/game/match_manager.go

@@ -0,0 +1,66 @@
+package game
+
+import (
+	"github.com/soer/football/internal/entities"
+)
+
+type GameState int
+
+const (
+	Playing GameState = iota
+	GoalPause
+	MatchEnded
+)
+
+type MatchManager struct {
+	World         *World
+	ScoreRed      int
+	ScoreBlue     int
+	State         GameState
+	MatchDuration float64
+	CurrentTime   float64
+	PauseDuration float64
+	PauseTimer    float64
+}
+
+func NewMatchManager(world *World, matchDuration, pauseDuration float64) *MatchManager {
+	return &MatchManager{
+		World:         world,
+		State:         Playing,
+		MatchDuration: matchDuration,
+		PauseDuration: pauseDuration,
+	}
+}
+
+func (m *MatchManager) Update() {
+	switch m.State {
+	case Playing:
+		team, scored := m.World.CheckGoal()
+		if scored {
+			if team == entities.TeamRed {
+				m.ScoreRed++
+			} else {
+				m.ScoreBlue++
+			}
+			m.State = GoalPause
+			m.PauseTimer = m.PauseDuration
+		} else {
+			m.World.Update()
+			m.CurrentTime += 1.0
+		}
+
+		if m.CurrentTime >= m.MatchDuration {
+			m.State = MatchEnded
+		}
+
+	case GoalPause:
+		m.PauseTimer -= 1.0
+		if m.PauseTimer <= 0 {
+			m.World.ResetPositions()
+			m.State = Playing
+		}
+
+	case MatchEnded:
+		// Do nothing
+	}
+}