#!/usr/bin/env python3
import hashlib
import json
import os
import pathlib
import sys
import tempfile

import bpy


def report():
    texture = bpy.data.textures.get("WebGapTexture")
    if texture is None:
        raise RuntimeError("WebGapTexture is missing")
    return {
        "id": "texture:" + texture.name,
        "name": texture.name,
        "type": {"NONE": 0, "CLOUDS": 1, "WOOD": 2, "MARBLE": 3, "MAGIC": 4, "BLEND": 5, "STUCCI": 6, "NOISE": 7, "IMAGE": 8, "MUSGRAVE": 9, "VORONOI": 10, "DISTORTED_NOISE": 11}.get(texture.type, 0),
        "noiseScale": float(texture.noise_scale),
        "noiseDepth": int(texture.noise_depth),
        "intensity": float(texture.intensity),
        "contrast": float(texture.contrast),
        "saturation": float(texture.saturation),
    }


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --python check-texture-desktop.py -- FIXTURE REPORT")
    fixture, output = (pathlib.Path(value).resolve() for value in arguments)
    bpy.ops.wm.open_mainfile(filepath=str(fixture), load_ui=False)
    before = report()
    descriptor, temporary = tempfile.mkstemp(prefix="m16-texture-reopen-", suffix=".blend", dir=fixture.parent)
    os.close(descriptor)
    try:
        bpy.ops.wm.save_as_mainfile(filepath=temporary, check_existing=False, compress=True)
        bpy.ops.wm.open_mainfile(filepath=temporary, load_ui=False)
        after = report()
    finally:
        pathlib.Path(temporary).unlink(missing_ok=True)
    if before != after:
        raise RuntimeError(f"texture save/reopen drift: {before} != {after}")
    value = {"schemaVersion": 1, "task": "M16-GAP-00025", "operation": "TEXTURE_DATABLOCK_DESKTOP", "fixture": str(fixture), "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(), "texture": after, "saveReopen": "EXACT", "blenderVersion": bpy.app.version_string}
    output.parent.mkdir(parents=True, exist_ok=True)
    output.write_text(json.dumps(value, indent=2, sort_keys=True) + "\n", encoding="utf-8")
    print(f"texture-desktop-ok id={after['id']} type={after['type']} saveReopen=exact")


if __name__ == "__main__":
    main()