import bpy
import arm.utils
import arm.make_state as make_state
import arm.material.cycles as cycles
import arm.log as log

add_mesh_contexts = []

def disp_linked(output_node):
    # Armory PBR with unlinked height socket
    linked = output_node.inputs[2].is_linked
    tess_enabled = arm.utils.tess_enabled(make_state.target)
    if linked:
        l = output_node.inputs[2].links[0]
        if l.from_node.type == 'GROUP' and l.from_node.node_tree.name.startswith('Armory PBR') and l.from_node.inputs[10].is_linked == False:
            return False
    if linked and not tess_enabled:
        log.warn('Tessellation not available on ' + make_state.target)
    return tess_enabled and linked

def get_rpasses(material):

    ar = []

    # if material.depthpass:
        # ar.append('depth')

    if material.decal:
        ar.append('decal')
    elif material.overlay:
        ar.append('overlay')
    elif is_transluc(material):
        ar.append('translucent')
    else:
        ar.append('mesh')
        for con in add_mesh_contexts:
            ar.append(con)
        if bpy.data.cameras[0].rp_voxelgi:
            ar.append('voxel')
            if bpy.data.worlds['Arm'].voxelgi_multibounce:
                ar.append('voxelbounce')
        if bpy.data.cameras[0].rp_renderer == 'Deferred Plus':
            ar.append('rect')

    shadows_enabled = False
    for cam in bpy.data.cameras:
        if cam.rp_shadowmap != 'None':
            shadows_enabled = True
            break

    if material.cast_shadow and shadows_enabled and ('mesh' in ar or 'translucent' in ar):
        ar.append('shadowmap')

    return ar

def is_transluc(material):
    nodes = material.node_tree.nodes
    output_node = cycles.node_by_type(nodes, 'OUTPUT_MATERIAL')
    if output_node == None or output_node.inputs[0].is_linked == False:
        return False

    surface_node = output_node.inputs[0].links[0].from_node
    return is_transluc_traverse(surface_node)

def is_transluc_traverse(node):
    # TODO: traverse groups
    if is_transluc_type(node):
        return True
    for inp in node.inputs:
        if inp.is_linked:
            res = is_transluc_traverse(inp.links[0].from_node)
            if res:
                return True
    return False

def is_transluc_type(node):
    if node.type == 'BSDF_GLASS' or \
       node.type == 'BSDF_TRANSPARENT' or \
       node.type == 'BSDF_TRANSLUCENT' or \
       (node.type == 'GROUP' and node.node_tree.name.startswith('Armory PBR') and (node.inputs[12].is_linked or node.inputs[12].default_value != 1.0)):
       return True
    return False