inventory_drawer_height=0
inventory_drawer_height_max=106
 
inventory_cursor = {
    x=0, y=0,
}

function inventory_before()
    inventory_cursor.x = 0
    inventory_cursor.y = 0
end

function inventory_slide(x1, x2)
    return {
        timer = 0,
        active=true,

        before=function(s) 
            inventory_drawer_height = x1
        end,

        update=function(s) 
            inventory_drawer_height = x1 + (s.timer/0.2)*(x2-x1)
            if s.timer > 0.2 then 
                inventory_drawer_height = x2
                s.active=false 
            end
        end,
        draw=function(s)
            draw_drawer()
            draw_item_sheet()
        end,
    }
end

function inventory_update()
    cx, cy = inventory_cursor.x, inventory_cursor.y
    if btnp(0) then cx -= 1 end
    if btnp(1) then cx += 1 end
    if btnp(2) then cy -= 1 end
    if btnp(3) then cy += 1 end
    if cy >= 0 and cy < flr(#inventory/5) and cx >= 0 and cx < 5 then
        inventory_cursor.x = cx
        inventory_cursor.y = cy
    elseif cy == flr(#inventory / 5) and cx >= 0 and cx < #inventory % 5 then
        inventory_cursor.x = cx
        inventory_cursor.y = cy
    elseif btnp(3) then
        animate(inventory_slide(inventory_drawer_height_max,0))
        change_screen(screen_workbench)
    end

    if btnp(5) then
        animate(inventory_slide(inventory_drawer_height_max,0))
        change_screen(screen_workbench)
    end
end

function inventory_draw()
    bench_draw()
    draw_drawer()
    draw_item_sheet()
end

function draw_drawer()
    rectfill(14, 0, 114, inventory_drawer_height, 4)
    for y=0,(inventory_drawer_height_max / 8) do
        yval = y*8 + inventory_drawer_height - inventory_drawer_height_max
        line(10, yval, 110, yval, 5)
        for x=1,(4 - (y%2)) do
            xval = x*32 + (y%2)*16
            line(xval, yval, xval, yval+8, 5)
        end
        spr(20, 10,  yval)
        spr(20, 110, yval)
    end
    rectfill(6, inventory_drawer_height, 120, inventory_drawer_height+7, 4)
    line(6, inventory_drawer_height, 120, inventory_drawer_height, 9)
    line(6, inventory_drawer_height+7, 120, inventory_drawer_height+7, 9)
    spr(21, 2, inventory_drawer_height)
    spr(21, 118, inventory_drawer_height, 1, 1, true, false)
    spr(22, 60, inventory_drawer_height+8)
    draw_drawer_contents()

end

function draw_drawer_contents()
    for i, val in ipairs(inventory) do
        x, y = 20+20*((i-1)%5), 10+20*flr((i-1)/5) + inventory_drawer_height - inventory_drawer_height_max
        if inventory_cursor.x + 5*inventory_cursor.y == i-1 then
            rect(x-2,y-2,x+9,y+9, 10)
        end
        sprite = val.sprite
        if sprite == nil then sprite = 36 end
        if val.sprite_recolor ~= nil then
            pal(val.sprite_recolor)
        end
        spr(sprite, x, y)
        pal()
    end
end

function draw_item_sheet()
    local item = inventory[1 + 5*inventory_cursor.y + inventory_cursor.x]
    if item ~= nil then
        draw_paper(35,94, 128-2*35,28)
        draw_ingredient_listing(item, 35, 94)
    end
end


screen_inventory_raw = {before=inventory_before, draw=inventory_draw, update=inventory_update}
screen_inventory = screen_conversation({
    {ph_p, [[oh right, this is the drawer where i keep my stuff!]]},}, 
    function() 
        screen_inventory = screen_inventory_raw
        change_screen(screen_inventory)
    end,
    screen_inventory_raw)