-- Substitute an obj mesh node with an alembic mesh node
--
-- @description substitute an obj mesh node with an alembic mesh node with the same materials pins
-- @author      Beppe Gullotta aka bepeg4d
-- @version     0.1

-- get the current selection
local selection = octane.project.getSelection()

if #selection ~= 2 or selection.type ~= octane.node.NT_GEO_MESH and selection.type ~= octane.GT_GEOMETRYARCHIVE then
error ("please select an obj node and an abc node") 
end
print (unpack(selection))

if selection[1].type ~= octane.node.NT_GEO_MESH then
    mesh    = selection[1]
    abc     = selection[2]
else
    mesh    = selection[2]
    abc     = selection[1]
end
print (mesh)
print (abc)
local parent = abc:getInputNodes()
print(unpack(parent))

-- get the position of the selected node in the graph editor
pos = selection[2].position
print ("mesh node position =")
print (unpack(pos))

-- table with params for the "macro" node graph
params = {}
params.type = octane.GT_STANDARD
params.name = string.format (mesh.name .."-node-materials")
params.position = {pos[1], pos[2]-40}

-- creates the "macro" node graph, ie. root for all other nodes
root = octane.nodegraph.create(params)

local nodes = octane.nodegraph.copyItemTree(root, mesh)
octane.node.destroy(nodes)
local materials = octane.nodegraph.getOwnedItems(root)
print (unpack(materials))

-- create the output nodes and connect them with the abc material pins
local outMats = {}
for i, x in pairs(materials) do
    outMat = octane.node.create
        {
            type        = octane.NT_OUT_MATERIAL,
            name        = x.name,
            graphOwner  = root,
        }
    outMat:connectTo(octane.P_INPUT, x)
    print("finded " ..outMat.name)

    octane.nodegraph.unfold(root, false)

    for a, abcInLinker in ipairs(abc:getInputNodes()) do   
        if abcInLinker.name == outMat.name and abcInLinker.type == octane.NT_IN_MATERIAL then
            abcInLinker:connectTo(octane.P_INPUT, outMat)
            print(abcInLinker.name .." connected with "..outMat.name)
        elseif abcInLinker.name ~= outMat.name or abcInLinker.type == octane.NT_IN_MATERIAL then
            print(abcInLinker.name .." not connected with "..outMat.name)
        end
    end
end