import bpy

# Delete default cube if present
# Our delete all function would have worked fine too
if "Cube" in bpy.data.objects:
    bpy.data.objects["Cube"].select_set(True)
    bpy.ops.object.delete()

bpy.ops.mesh.primitive_cube_add(size=5)
cube = bpy.context.active_object

# We'll need one material per texture
# Since our textures are in different images
materials = []
for i in range(6):
    mat = bpy.data.materials.new(name=f"FaceMaterial_{i}")
    mat.use_nodes = True
    materials.append(mat)

# Did I end up with more than two fish?
# If not, I guess we just get two
textures = [
    "clownfish.jpg",
    "yellowtang.jpg",
    "clownfish.jpg",
    "yellowtang.jpg",
    "bluetang.jpg",
    "bluetang.jpg"
]

# We can load all the files here
# Does it matter compared to later?  Probably not.
loaded_textures = []
for tex_path in textures:
    loaded_textures.append(bpy.data.images.load(tex_path))

bpy.ops.object.mode_set(mode='EDIT')
# We're not going to use the coordinates unwrap generates anyway
# Just need a uv attribute
bpy.ops.uv.unwrap(method='ANGLE_BASED')
bpy.ops.object.mode_set(mode='OBJECT')

# The materials need to be attached to the cube
cube.data.materials.clear()  # Clear any existing materials on the cube
for mat in materials:
    cube.data.materials.append(mat)

# Define UV mapping coordinates (one per face of the cube)
face_uvs = [
    [(1, 0), (1, 1), (0, 1), (0, 0)],  # Back face
    [(1, 0), (1, 1), (0, 1), (0, 0)],  # Right face
    [(1, 0), (1, 1), (0, 1), (0, 0)],  # Front face
    [(1, 0), (1, 1), (0, 1), (0, 0)],  # Left face
    [(0, 0), (1, 0), (1, 1), (0, 1)],  # Bottom face
    [(0, 0), (1, 0), (1, 1), (0, 1)],  # Top face
]

# In the bmesh, we had faces
# We don't seem to have faces in cube.data
# "polygon" seems to be a synonym for "face"
# Apparently older versions of the API used the term "face"
for i, poly in enumerate(cube.data.polygons):
    # This is the same process we've been using for materials
    # Get the Principled BSDF shader
    bsdf_node = materials[i].node_tree.nodes.get("Principled BSDF")
    # Create the texture node and assign the image
    texture_node = materials[i].node_tree.nodes.new(type="ShaderNodeTexImage")
    texture_node.image = loaded_textures[i]
    # Link the texture to the BSDF shader
    materials[i].node_tree.links.new(texture_node.outputs["Color"], bsdf_node.inputs["Base Color"])

    # Set the material index for this polygon
    # Since we have a list of 6 materials for the cube 
    poly.material_index = i
    
    # Get the UV layer for the face
    uv_layer = cube.data.uv_layers.active.data
    
    # Copy over uv values
    for j, loop_index in enumerate(poly.loop_indices):
        uv_layer[loop_index].uv = face_uvs[i][j]