-- Inventory System -- module (starter).
--
-- Define two classes: Item and Inventory. Export both as M.Item and
-- M.Inventory at the end of the file.

local M = {}

-------------------------------------------------------------------
-- Item class
-------------------------------------------------------------------

local Item = {}
Item.__index = Item

function Item.new(name, weight, value)
    -- TODO: build self with setmetatable, assign name, weight, value
end

function Item:describe()
    -- TODO: return a string like "sword (3.5kg, 50g)"
end

-------------------------------------------------------------------
-- Inventory class
-------------------------------------------------------------------

local Inventory = {}
Inventory.__index = Inventory

function Inventory.new()
    -- TODO: build self with setmetatable, assign self.items = {}
end

function Inventory:add(item)
    -- TODO: table.insert(self.items, item)
end

function Inventory:remove(name)
    -- TODO: walk self.items; if an item has the matching name,
    -- table.remove it and return it. Otherwise return nil.
end

function Inventory:list()
    -- TODO: print "Inventory (N items):" then each item on its
    -- own line, then a totals line.
end

function Inventory:totalWeight()
    -- TODO: sum weights, return total
end

function Inventory:totalValue()
    -- TODO: sum values, return total
end

M.Item = Item
M.Inventory = Inventory
return M