local Healthbar = Object:extend()

function Healthbar:new(x, y, hp)
    self.x = x or 100
    self.y = y or 100
    self.hp = hp or 100
    self.max_width = 200
    self.qwidth = (self.hp / 100) * self.max_width
    self.lwidth = self.qwidth
end

function Healthbar:decrease(amount)
    if self.hp ~= 0 then
        if fg then timer:cancel(fg) end
        if bg then timer:cancel(bg) end
        if self.hp - amount <= 0 then
            self.hp = 0
        else
            self.hp = self.hp - amount
        end
        local target_width = self.max_width * (self.hp / 100)
        fg = timer:tween(0.3, self, {qwidth = target_width}, 'in-out-cubic')
        bg = timer:tween(0.6, self, {lwidth = target_width}, 'in-out-cubic')
    end
end

function Healthbar:update(dt)
    if input:pressed('right') then self:decrease(20) end
end

function Healthbar:draw()
    -- trailing hp
    love.graphics.setColor(1, 0.5, 0.5)
    love.graphics.rectangle("fill", self.x, self.y, self.lwidth, 20)

    -- healthbar
    love.graphics.setColor(1, 0.2, 0.2)
    love.graphics.rectangle("fill", self.x, self.y, self.qwidth, 20)
end

return Healthbar