-- scripts/healthbar.lua
-- RectNode: the engine draws the green bar automatically.
-- This script drives the HP logic and recolors/resizes the bar.

local max_hp = 100
local hp     = 100

---@param self RectNode
function on_init(self)
  self.x      = 20
  self.y      = 20
  self.width  = 200
  self.height = 20
  self.color  = { r = 60, g = 200, b = 80, a = 255 }
  log("HealthBar ready")
end

---@param self RectNode
---@param dt   number
function on_update(self, dt)
  -- Slow drain (replace with real damage events)
  hp = math.max(0, hp - 4 * dt)

  -- Shrink bar proportionally
  self.width = (hp / max_hp) * 200

  -- Green → red as HP drops
  local t = hp / max_hp
  self.color.r = math.floor((1 - t) * 220)
  self.color.g = math.floor(t * 200)
  self.color.b = 40
end

---@param self RectNode
function on_render(self)
  -- Label drawn on top of the auto-rendered bar
  local label = "HP: " .. (math.floor(hp)) .. (" / ") .. max_hp
  draw_text(label, self.x + 4, self.y + 4, 12, 240, 240, 240)
end