Define Properties()
    inventoryWindow = 0
    inventorySlots = { {0, 0, 0, 0, 0},
                       {0, 0, 0, 0, 0},
                       {0, 0, 0, 0, 0} }
    paperDollSlots = { head = {id=0, buttonx=60, buttony=28}, 
                       armor = {id=0, buttonx=60, buttony=66},
                       l_hand = {id=0, buttonx=19, buttony=66},
                       r_hand = {id=0, buttonx=101, buttony=66},
                       belt_1 = {id=0, buttonx=6, buttony=104},
                       belt_2 = {id=0, buttonx=44, buttony=104}, 
                       belt_3 = {id=0, buttonx=82, buttony=104}, 
                       belt_4 = {id=0, buttonx=120, buttony=104} }
    inventory_box_x = 161
    inventory_box_y = 28
    inventory_slot_width = 34
    inventory_slot_height = 34
    inventory_slot_pad_x = 4
    inventory_slot_pad_y = 4
end

Trigger showInventory(user, iflag)
    --Debug("iflag: %d", iflag)
    if (iflag == 1) then
        --Debug("Show window")
        if(self.inventoryWindow == 0) then  
            --Debug("Create Window")
            createInventoryWindow(self, user)    
        end
    else
        --Debug("Dismiss")
        SendTo(self, "dismissInventory", 0)
    end
end

Trigger refreshSlot(i, j)
    if (inventoryWindow ~= 0) then
        resetBackpackButton(self, i, j)
    end
end

Trigger moveInventory(user, location, i, j)
    --Debug("Move inventory: %s %d %d", location, i, j)
    local sprite = 0
    local flag = 1
    if (self.inHand == 0) then
        if ((location == "backpack") and (self.backpack[i][j]) ~= 0) then
            --Debug("Pickup from backpack")
            sprite = GetObjectById(self.backpack[i][j]).spriteId
            UiSetCursor(user, sprite, 32, 32)
            --Debug("Cursor set")
            self.inHand = self.backpack[i][j]
            self.backpack[i][j] = 0
            if (self.backpack[i][j] ~= 0) then
                Debug("Remove unsuccessful")
            end
            -- reset button
            resetBackpackButton(self, i, j)
        else
            if (self.paperDoll[location] and self.paperDoll[location] ~= 0) then
                --Debug("Pickup from paperdoll")
                sprite = GetObjectById(self.paperDoll[location]).spriteId
                self.inHand = self.paperDoll[location]
                self.paperDoll[location]=0
                UiSetCursor(user, sprite, 32, 32)
                resetPaperDollButton(self, location)
                SendTo(user, "ui_refreshUnitPanel", 0, self)
            else
                UiSetCursor(user, -1, 0, 0)
            end
        end
    else
        local temp = 0
        -- place an object in an inventory slot
        if (location == "backpack") then
            --Debug("Drop into backpack")
            temp = self.backpack[i][j]
            self.backpack[i][j] = self.inHand
            -- reset button
            resetBackpackButton(self, i, j)
        else
            --Debug("Drop onto paperdoll")
            temp = self.paperDoll[location]
            self.paperDoll[location] = self.inHand
            --Debug("PaperDoll[%s]: %d temp: %d", location, self.paperDoll[location], temp)
            resetPaperDollButton(self, location)
            SendTo(user, "ui_refreshUnitPanel", 0, self)
        end
        if (temp ~= 0) then
            --Debug("Pickup on drop")
            self.inHand = temp
            UiSetCursor(user, GetObjectById(temp).spriteId, 32, 32)
        else
            self.inHand = 0
            UiSetCursor(user, -1, 0, 0)      
        end
           
    end       
end

Trigger dismissInventory()
    if (self.inventoryWindow ~= 0) then
        UiDelete(self.inventoryWindow)
        self.inventoryWindow = 0
    end
    -- clear buttons
    for i=1, 3 do 
        for j=1, 5 do
            self.inventorySlots[i][j] = 0
        end
    end
end

function createInventoryWindow(self, user)
    --Debug("createWindow")
    if (self.inventoryWindow ~= 0) then
        UiDelete(self.inventoryWindow)
        self.inventoryWindow = 0
    end
    width = 6+(5*(34+4))+4
    self.inventoryWindow = UiWindow(0, "unitInventoryWindow", 100, 100, width+155, 28+(3*(34+4))+4, '13197:3')
    UiCapability(self.inventoryWindow, "drag")
    
    createPaperDollPanel(self)
    createBackpackPanel(self) 
    
    local label = UiLabel(self.inventoryWindow, "title", 4+155, 3, "Backpack")
    UiColor(label, 0, 0, 0, 1)
    
    label = UiLabel(self.inventoryWindow, "title", 4, 3, "Body/Belt")
    UiColor(label, 0, 0, 0, 1)
    
    UiImageButton(self.inventoryWindow, "button", width + 155 - 15, 6, 10, 10, "13197:82", "13197:83", "13197:84", "showUnitInventory 0")
    UiAttachUser(user, self.inventoryWindow)
end

function createPaperDollPanel(self)
    local width = 34
    local height = 34
    local spriteId = "0:701"
    -- paperdoll image
    
    -- head slot
    rect = UiRect(self.inventoryWindow, "frame", 60, 28, width, height)
        UiColor(rect, 0, 0, 0, 1)
        rect = UiRect(self.inventoryWindow, "rect", 60+1, 28+1, width-2, height-2)
        UiColor(rect, 255, 200, 0, 1)
        local slot = self.paperDollSlots["head"]
        resetPaperDollButton(self, "head")
        --self.paperDollSlots["head"].id = UiImageButton(self.inventoryWindow, "paperDollSlot", slot.buttonx, slot.buttony, 32, 32, spriteId, spriteId, spriteId, "moveInventory head 0 0")

    -- armor slot
        rect = UiRect(self.inventoryWindow, "frame", 60, 66, width, height)
        UiColor(rect, 0, 0, 0, 1)
        rect = UiRect(self.inventoryWindow, "rect", 60+1, 67, width-2, height-2)
        UiColor(rect, 255, 200, 0, 1)
        slot = self.paperDollSlots["armor"]
        --Debug("%d %d", slot.buttonx, slot.buttony)
        resetPaperDollButton(self, "armor")
        --self.paperDollSlots["armor"].id = UiImageButton(self.inventoryWindow, "paperDollSlot", slot.buttonx, slot.buttony, 32, 32, spriteId, spriteId, spriteId, "moveInventory armor 0 0")

    -- left hand
    rect = UiRect(self.inventoryWindow, "frame", 19, 66, width, height)
        UiColor(rect, 0, 0, 0, 1)
        rect = UiRect(self.inventoryWindow, "rect", 19+1, 67, width-2, height-2)
        UiColor(rect, 255, 200, 0, 1)
        slot = self.paperDollSlots["l_hand"]
        resetPaperDollButton(self, "l_hand")
        --self.paperDollSlots["l_hand"].id = UiImageButton(self.inventoryWindow, "paperDollSlot", slot.buttonx, slot.buttony, 32, 32, spriteId, spriteId, spriteId, "moveInventory l_hand 0 0")

    -- right hand
    rect = UiRect(self.inventoryWindow, "frame", 101, 66, width, height)
        UiColor(rect, 0, 0, 0, 1)
        rect = UiRect(self.inventoryWindow, "rect", 101+1, 67, width-2, height-2)
        UiColor(rect, 255, 200, 0, 1)
        slot = self.paperDollSlots["r_hand"]
        resetPaperDollButton(self, "r_hand")
        --self.paperDollSlots["r_hand"].id = UiImageButton(self.inventoryWindow, "paperDollSlot", slot.buttonx, slot.buttony, 32, 32, spriteId, spriteId, spriteId, "moveInventory r_hand 0 0")

    local beltSlotKey = "key"
    -- belt slots (4)
    for i=1,4 do
        rect = UiRect(self.inventoryWindow, "frame", 6+((i-1)*(34+4)), 104, width, height)
        UiColor(rect, 0, 0, 0, 1)
        rect = UiRect(self.inventoryWindow, "rect", 6+((i-1)*(34+4))+1, 105, width-2, height-2)
        UiColor(rect, 255, 200, 0, 1)
        
        slot = self.paperDollSlots["belt_"..i]
        resetPaperDollButton(self, "belt_"..i)
        --self.paperDollSlots["belt_"..i].id = UiImageButton(self.inventoryWindow, "paperDollSlot", slot.buttonx, slot.buttony, 32, 32,spriteId, spriteId, spriteId, "moveInventory belt_"..i.." 0 0")

    end
       
    rect = UiRect (self.inventoryWindow, "separator", 157, 32, 1, 104)
    UiColor(rect, 0, 0, 0, .8) 
end

function createBackpackPanel(self)
    -- local vars for creation of UI
    local rect = 0
    local window = 0
    local width = 34
    local height = 34
    local padding_x = 4
    local padding_y = 4
    local start_x = 161
    local start_y = 28
    local row = 3
    local column = 5
    local sprite = 0
    
    for i=1, row do 
        for j=1, column do
            --Debug("%d %d", i, j)
            rect = UiRect(self.inventoryWindow, "frame", start_x+((j-1)*(width+padding_x)), start_y+((i-1)*(height+padding_y)), width, height)
            UiColor(rect, 0, 0, 0, 1)
            rect = UiRect(self.inventoryWindow, "rect", start_x+((j-1)*(width+padding_x))+1, start_y+((i-1)*(height+padding_y))+1, width-2, height-2)
            UiColor(rect, 255, 200, 0, 1)
            -- parentId, name, x, y, w, h, defaultArtId, hoverArtId, pressArtId, cmd
            --Debug("%d", (j*5)+i+1)
            --Debug("%d", self.backpack[i][j] or 0)
            if (self.backpack[i][j] ~= 0) then
                --Debug("%d", self.backpack[i][j])
                --sprite = GetObjectById(self.backpack[(j*5)+i+1]).spriteId
                sprite = "0:701"
            else
                --Debug("Blank Sprite")
                sprite = "12071:448"
            end
            --Debug("Create Button: %d, %d", start_x+((j-1)*(width+padding_x))+1, start_y+((i-1)*(height+padding_y))+1)
            --inventoryButtons[i][j] = UiImageButton(self.inventoryWindow, "inventory", 
            --                       start_x+((j-1)*(width+padding_x))+1, start_y+((i-1)*(height+padding_y))+1, 
            --                       width-2, height-2, sprite, sprite, sprite, "moveInventory backpack " .. i .. " " ..j)
            self.inventorySlots[i][j] = createSlotButton(self, self.inventoryWindow, i, j)
        end
    end
end

function createSlotButton(self, windowId, i, j)
    if (self.backpack[i][j] ~= 0) then
        local object = GetObjectById(self.backpack[i][j])
        if (object) then
            sprite = object.spriteId
        else
            sprite = '12071:448'
            Debug("Object %d in backpack does not exist", self.backpack[i][j])
        end
    else
        sprite = "12071:448"
    end
    return UiImageButton(windowId, "inventorySlot", calculateSlotX(self, j, i), calculateSlotY(self, j, i), self.inventory_slot_width-2, self.inventory_slot_height-2, sprite, sprite, sprite, "moveInventory backpack " .. i .. " " .. j)
end

function resetBackpackButton(self, i, j)
    -- delete the current button
    UiDelete(self.inventorySlots[i][j])
    -- create a new button
    self.inventorySlots[i][j] = createSlotButton(self, self.inventoryWindow, i, j)
end

function resetPaperDollButton(self, location)
    --Debug("Reset: %s", location)
    local slot = self.paperDollSlots[location]
    local sprite
    local object
    if (slot.id ~= 0) then
        UiDelete(slot.id)
    end
    if (self.paperDoll[location] ~= 0) then
        object = GetObjectById(self.paperDoll[location])
        if (object) then
            sprite = object.spriteId
        else
            Debug("Item %d lost from unit %d container", self.paperDoll[location], self.id)
            self.paperDoll[location] = 0
            sprite = '12071:448'
        end
    else
        sprite = "12071:448"
    end
    self.paperDollSlots[location].id = UiImageButton(self.inventoryWindow, "paperDollSlot", slot.buttonx, slot.buttony, 32, 32, sprite, sprite, sprite, "moveInventory "..location.." 0 0")
end

function calculateSlotX(self, x, y)
    --Debug("%d", self.inventory_box_x)
    return self.inventory_box_x + ((x - 1) * (self.inventory_slot_width + self.inventory_slot_pad_x)) + 1
end

function calculateSlotY(self, x, y)
    return self.inventory_box_y + ((y -1) * (self.inventory_slot_height + self.inventory_slot_pad_y)) + 1
end