# Which image datablocks exist, and which ones the body material actually SAMPLES.
#   blender --background --python 16b_images.py -- <blend> [<blend2> ...]
import bpy, sys
import numpy as np

for BLEND in sys.argv[sys.argv.index("--") + 1:]:
    bpy.ops.wm.open_mainfile(filepath=BLEND)
    print(f"\n===== {BLEND} =====")
    ob = max([o for o in bpy.data.objects if o.type == 'MESH'],
             key=lambda o: len(o.data.vertices))
    print(f"body '{ob.name}' {len(ob.data.vertices)}v  materials="
          f"{[ms.material.name if ms.material else None for ms in ob.material_slots]}")
    for i in bpy.data.images:
        b = np.empty(i.size[0] * i.size[1] * 4, dtype=np.float32)
        try:
            i.pixels.foreach_get(b)
            m = b.reshape(-1, 4)[:, :3]
            stat = f"mean {m.mean(axis=0).round(4)} std {m.std(axis=0).round(4)}"
        except Exception as e:
            stat = f"(no pixels: {e})"
        print(f"  IMG '{i.name}' {i.size[0]}x{i.size[1]} packed={bool(i.packed_file)} "
              f"file='{i.filepath}' {stat}")
    for ms in ob.material_slots:
        mat = ms.material
        if not mat or not mat.node_tree:
            continue
        print(f"  MAT '{mat.name}':")
        bsdf = next((n for n in mat.node_tree.nodes if n.type == 'BSDF_PRINCIPLED'), None)
        for n in mat.node_tree.nodes:
            if n.type == 'TEX_IMAGE':
                tgt = []
                for o in n.outputs:
                    for lk in o.links:
                        tgt.append(f"{lk.to_node.name}.{lk.to_socket.name}")
                print(f"    TEX_IMAGE node '{n.name}' image='{n.image.name if n.image else None}'"
                      f" -> {tgt if tgt else 'UNCONNECTED'}")
        if bsdf:
            for sock in ("Base Color", "Normal", "Roughness", "Metallic"):
                if sock in bsdf.inputs:
                    lk = bsdf.inputs[sock].links
                    src = lk[0].from_node.name if lk else "(unlinked)"
                    if lk and lk[0].from_node.type == 'TEX_IMAGE':
                        src += f" image='{lk[0].from_node.image.name if lk[0].from_node.image else None}'"
                    print(f"    BSDF.{sock} <- {src}")
print("IMAGES_DONE")