feat: entity definitions — player classes, monsters, items

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

entity/player.go

@@ -0,0 +1,96 @@
+package entity
+
+type Class int
+
+const (
+	ClassWarrior Class = iota
+	ClassMage
+	ClassHealer
+	ClassRogue
+)
+
+func (c Class) String() string {
+	return [...]string{"Warrior", "Mage", "Healer", "Rogue"}[c]
+}
+
+type classStats struct {
+	HP, ATK, DEF int
+}
+
+var classBaseStats = map[Class]classStats{
+	ClassWarrior: {120, 12, 8},
+	ClassMage:    {70, 20, 3},
+	ClassHealer:  {90, 8, 5},
+	ClassRogue:   {85, 15, 4},
+}
+
+type Player struct {
+	Name        string
+	Fingerprint string
+	Class       Class
+	HP, MaxHP   int
+	ATK, DEF    int
+	Gold        int
+	Inventory   []Item
+	Relics      []Relic
+	Dead        bool
+}
+
+func NewPlayer(name string, class Class) *Player {
+	stats := classBaseStats[class]
+	return &Player{
+		Name:  name,
+		Class: class,
+		HP:    stats.HP,
+		MaxHP: stats.HP,
+		ATK:   stats.ATK,
+		DEF:   stats.DEF,
+	}
+}
+
+func (p *Player) TakeDamage(dmg int) {
+	p.HP -= dmg
+	if p.HP <= 0 {
+		p.HP = 0
+		p.Dead = true
+	}
+}
+
+func (p *Player) Heal(amount int) {
+	p.HP += amount
+	if p.HP > p.MaxHP {
+		p.HP = p.MaxHP
+	}
+}
+
+func (p *Player) IsDead() bool {
+	return p.Dead
+}
+
+func (p *Player) Revive(hpPercent float64) {
+	p.Dead = false
+	p.HP = int(float64(p.MaxHP) * hpPercent)
+	if p.HP < 1 {
+		p.HP = 1
+	}
+}
+
+func (p *Player) EffectiveATK() int {
+	atk := p.ATK
+	for _, item := range p.Inventory {
+		if item.Type == ItemWeapon {
+			atk += item.Bonus
+		}
+	}
+	return atk
+}
+
+func (p *Player) EffectiveDEF() int {
+	def := p.DEF
+	for _, item := range p.Inventory {
+		if item.Type == ItemArmor {
+			def += item.Bonus
+		}
+	}
+	return def
+}