lib/inventory

-- return true if two items are identical
function isItemIdentical(item1, item2, ignoreQty)
    if not item1 then
        error("First item cannot be nil.")
    end
    if not item2 then
        error("Second item cannot be nil")
    end
    return compareItems(item1, item2, ignoreQty) and compareItems(item2, item1, ignoreQty)
end

-- compare recursively two items
function compareItems(item1, item2, ignoreQty)
    for k,v in pairs(item1) do
        if type(v) ~= type(item2[k]) then
            return false
        end
        if type(v) == "table" then
          if not compareItems(v, item2[k], ignoreQty) then
            return false
          end
        else
          if (not ignoreQty and v ~= item2[k]) or (k ~= "qty" and v ~= item2[k]) then
            return false
          end
        end
    end
    return true
end

-- check if an item is present in a list of items
function isItemInList(item1, itemList, ignoreQty)
    for k,item2 in pairs(itemList) do
        if isItemIdentical(item1, item2, ignoreQty) then
            return k
        end
    end
    return false
end

-- compare two list of items recursively
function isItemListIdentical(items1, items2, ignoreQty)
    for _,item1 in pairs(items1) do
        if not isItemInList(item1, items2, ignoreQty) then
            return false
        end
    end
    for _,item2 in pairs(items2) do
        if not isItemInList(item2, items1, ignoreQty) then
            return false
        end
    end
    return true
end

-- returns true if the container contains an item, if no item specified then check for any item
function containsItem(container, item)
    if container == nil then
        error("Container peripheral is nil")
    end
    for i=1,container.getInventorySize() do
        local item2 = container.getStackInSlot(i)
        if (item and isItemIdentical(item, item2, false)) or (not item and item2) then
            return true
        end
    end
    return false
end

-- move all items from a container to another
function moveAllItems(container, outputContainerSide, delay)
    if container == nil then
        error("Container peripheral is nil")
    end
    for i=1,container.getInventorySize() do
        container.pushItem(outputContainerSide, i)
        if delay ~= nil then
            sleep(delay)
        end
    end
end