"""Generate a World readback input fixture; do not run acceptance checks."""
import bpy
import json
from pathlib import Path
import sys
source, destination = sys.argv[sys.argv.index("--") + 1:]
bpy.ops.wm.open_mainfile(filepath=str(Path(source).resolve()))
scene = bpy.context.scene
world = scene.world.copy() if scene.world else bpy.data.worlds.new("B4WorldReadback")
world.name = "B4WorldReadback"
scene.world = world
if world.node_tree is None: world.use_nodes = True
tree = world.node_tree
tree.nodes.clear()
scene.render.engine = "BLENDER_EEVEE"
def background(name, strength):
    node = tree.nodes.new("ShaderNodeBackground")
    node.name = name
    node.inputs["Strength"].default_value = strength
    return node
def environment(name, color):
    node = tree.nodes.new("ShaderNodeTexEnvironment")
    node.name = name
    node.image = bpy.data.images.new(name, width=1, height=1)
    node.image.pixels[:] = color
    node.image.pack()
    return node
background("B4_unused_first", 17.0)
active = background("B4_active", 2.5)
texture = environment("B4_active_environment", (0.25, 0.5, 0.75, 1.0))
output = tree.nodes.new("ShaderNodeOutputWorld")
output.is_active_output = True
tree.links.new(active.outputs["Background"], output.inputs["Surface"])
tree.links.new(texture.outputs["Color"], active.inputs["Color"])
background("B4_unused_last", 99.0)
environment("B4_unused_environment", (1.0, 0.0, 0.0, 1.0))
driver = tree.nodes.new("ShaderNodeValue")
driver.name = "B4_strength_driver"
driver.outputs[0].default_value = 7.5
mesh = next((obj for obj in scene.objects if obj.type == "MESH"), None)
if mesh and not any(obj.type == "MESH" and any(obj.data.materials) for obj in scene.objects):
    material = bpy.data.materials.new("B4FixtureMaterial")
    material.diffuse_color = (0.65, 0.65, 0.65, 1.0)
    if mesh.data.materials: mesh.data.materials[0] = material
    else: mesh.data.materials.append(material)
if scene.camera:
    scene.camera.data.lens = 52.0
    scene.camera.data.clip_start = 0.125
    scene.camera.data.clip_end = 2500.0
for light_object in (obj for obj in scene.objects if obj.type == "LIGHT"):
    light_object.data.energy = 650.0
    light_object.data.shadow_soft_size = 0.35
    if light_object.data.type == 'AREA': light_object.data.size = 2.0
scene.render.resolution_x, scene.render.resolution_y, scene.render.resolution_percentage = 1280, 720, 80
scene.render.image_settings.file_format = 'PNG'
destination = Path(destination).resolve()
destination.parent.mkdir(parents=True, exist_ok=True)
bpy.ops.wm.save_as_mainfile(filepath=str(destination), check_existing=False)
facts = {"kind": "input_fixture", "source": str(Path(source).resolve()), "fixture": str(destination),
         "world": world.name, "expectedStrength": 2.5, "expectedImage": texture.image.name,
         "inactiveStrengths": [17.0, 99.0], "driver": driver.name, "camera": scene.camera.name if scene.camera else None,
         "lights": [obj.name for obj in scene.objects if obj.type == "LIGHT"],
         "materialObjects": [obj.name for obj in scene.objects if obj.type == "MESH" and any(obj.data.materials)],
         "resolution": [scene.render.resolution_x, scene.render.resolution_y, scene.render.resolution_percentage], "format": scene.render.image_settings.file_format}
destination.with_suffix(".json").write_text(json.dumps(facts, indent=2) + "\n")