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

import bpy


def state():
    scene = bpy.context.scene
    tree = scene.compositing_node_group
    editor = scene.sequence_editor
    if tree is None or editor is None:
        raise RuntimeError("media fixture is missing compositor or sequencer")
    strips = sorted(editor.strips_all, key=lambda strip: strip.name)
    if len(tree.nodes) != 4 or len(tree.links) != 3 or len(strips) != 4:
        raise RuntimeError("media fixture has unexpected compositor/sequencer shape")
    return {
        "sceneId": "scene:" + scene.name,
        "compositor": {"name": tree.name, "nodes": sorted(node.name for node in tree.nodes), "links": len(tree.links)},
        "sequencer": {
            "fps": [scene.render.fps, scene.render.fps_base],
            "strips": [{"name": strip.name, "type": strip.type, "channel": strip.channel, "frameStart": strip.frame_final_start, "frameEnd": strip.frame_final_end, "mute": strip.mute, "source": getattr(getattr(strip, "sound", None), "filepath", None) or getattr(strip, "directory", None)} for strip in strips],
        },
    }


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --factory-startup --python check-wbv2-p5-002-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 = state()
    temporary = fixture.with_name(f"{fixture.stem}-reopen.blend")
    try:
        bpy.ops.wm.save_as_mainfile(filepath=str(temporary), check_existing=False, compress=True)
        bpy.ops.wm.open_mainfile(filepath=str(temporary), load_ui=False)
        after = state()
    finally:
        temporary.unlink(missing_ok=True)
    if before != after:
        raise RuntimeError(f"media save/reopen drift: {before} != {after}")
    report = {"schemaVersion": 1, "task": "WBV2-P5-002", "operation": "MEDIA_BOUNDED_WORKFLOW_DESKTOP", "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(), "state": after, "saveReopen": "EXACT", "blenderVersion": bpy.app.version_string}
    output.parent.mkdir(parents=True, exist_ok=True)
    output.write_text(json.dumps(report, indent=2, sort_keys=True) + "\n", encoding="utf-8")
    print("wbv2-p5-002-desktop-ok compositorNodes=%d sequencerStrips=%d fps=%s saveReopen=exact" % (len(after["compositor"]["nodes"]), len(after["sequencer"]["strips"]), after["sequencer"]["fps"]))


if __name__ == "__main__":
    main()