def inject(assembler, chain_definition, chain_items):
    if not chain_items:
        return

    ksampler_name = chain_definition.get('ksampler_node', 'ksampler')
    if ksampler_name not in assembler.node_map:
        print(f"Warning: KSampler node '{ksampler_name}' not found for Flux1 IPAdapter chain. Skipping.")
        return
        
    ksampler_id = assembler.node_map[ksampler_name]

    if 'model' not in assembler.workflow[ksampler_id]['inputs']:
        print(f"Warning: KSampler node '{ksampler_name}' is missing 'model' input. Skipping Flux1 IPAdapter chain.")
        return
        
    current_model_connection = assembler.workflow[ksampler_id]['inputs']['model']
    
    for item_data in chain_items:
        image_loader_id = assembler._get_unique_id()
        image_loader_node = assembler._get_node_template("LoadImage")
        image_loader_node['inputs']['image'] = item_data['image']
        assembler.workflow[image_loader_id] = image_loader_node

        ipadapter_loader_id = assembler._get_unique_id()
        ipadapter_loader_node = assembler._get_node_template("IPAdapterFluxLoader")
        ipadapter_loader_node['inputs']['ipadapter'] = "ip-adapter.bin"
        ipadapter_loader_node['inputs']['clip_vision'] = "google/siglip-so400m-patch14-384"
        ipadapter_loader_node['inputs']['provider'] = "cuda"
        assembler.workflow[ipadapter_loader_id] = ipadapter_loader_node
        
        apply_ipa_id = assembler._get_unique_id()
        apply_ipa_node = assembler._get_node_template("ApplyIPAdapterFlux")
        
        apply_ipa_node['inputs']['weight'] = item_data['weight']
        apply_ipa_node['inputs']['start_percent'] = item_data.get('start_percent', 0.0)
        apply_ipa_node['inputs']['end_percent'] = item_data.get('end_percent', 0.6)
        
        apply_ipa_node['inputs']['model'] = current_model_connection
        apply_ipa_node['inputs']['ipadapter_flux'] = [ipadapter_loader_id, 0]
        apply_ipa_node['inputs']['image'] = [image_loader_id, 0]
        
        assembler.workflow[apply_ipa_id] = apply_ipa_node
        current_model_connection = [apply_ipa_id, 0]

    assembler.workflow[ksampler_id]['inputs']['model'] = current_model_connection
    print(f"Flux1 IPAdapter injector applied. KSampler model input re-routed through {len(chain_items)} IPAdapter(s).")