feat(entity): add player and monster actors

src/entity.lua

@@ -0,0 +1,82 @@
+-- Player and monster actors. attack/defense are the effective values already
+-- including equipment; baseAttack/baseDefense keep the unequipped totals. Energy
+-- and speed drive the turn scheduler; statuses layer temporary modifiers on top.
+
+local Status = require("status")
+
+local Entity = {}
+Entity.__index = Entity
+
+function Entity.new(spec)
+  return setmetatable({
+    id = spec.id,
+    x = spec.x, y = spec.y,
+    glyph = spec.glyph,
+    name = spec.name,
+    kind = spec.kind,
+    species = spec.species,
+    ai = spec.ai,
+    hp = spec.hp,
+    maxHp = spec.maxHp or spec.hp,
+    attack = spec.attack,
+    defense = spec.defense,
+    baseAttack = spec.attack,
+    baseDefense = spec.defense,
+    speed = spec.speed or 100,
+    energy = spec.energy or 0,
+    range = spec.range or 0,
+    inventory = {},
+    statuses = {},
+    weapon = nil,
+    armor = nil,
+    ring = nil,
+  }, Entity)
+end
+
+function Entity:isAlive()
+  return self.hp > 0
+end
+
+function Entity:effectiveAttack()
+  return self.attack + Status.attackModifier(self)
+end
+
+function Entity:effectiveDefense()
+  return self.defense
+end
+
+function Entity:effectiveSpeed()
+  local speed = self.speed + Status.speedModifier(self)
+  if speed < 10 then speed = 10 end
+  return speed
+end
+
+function Entity:toData()
+  return {
+    id = self.id,
+    x = self.x, y = self.y,
+    glyph = self.glyph, name = self.name, kind = self.kind,
+    species = self.species, ai = self.ai,
+    hp = self.hp, maxHp = self.maxHp,
+    attack = self.attack, defense = self.defense,
+    baseAttack = self.baseAttack, baseDefense = self.baseDefense,
+    speed = self.speed, energy = self.energy, range = self.range,
+    inventory = self.inventory,
+    statuses = self.statuses,
+    weapon = self.weapon,
+    armor = self.armor,
+    ring = self.ring,
+  }
+end
+
+function Entity.fromData(snapshot)
+  local entity = setmetatable({}, Entity)
+  for field, value in pairs(snapshot) do
+    entity[field] = value
+  end
+  entity.inventory = snapshot.inventory or {}
+  entity.statuses = snapshot.statuses or {}
+  return entity
+end
+
+return Entity