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

import bpy


def report():
    text = bpy.data.texts.get("WebGapText")
    if text is None:
        raise RuntimeError("WebGapText is missing")
    source = text.as_string()
    return {
        "id": "text:" + text.name,
        "name": text.name,
        "source": source,
        "sourceSha256": hashlib.sha256(source.encode("utf-8")).hexdigest(),
        "byteLength": len(source.encode("utf-8")),
        "lineCount": len(source.splitlines()) + (1 if source.endswith("\n") else 0),
        "sourcePath": text.filepath,
        "internal": not bool(text.filepath),
        "isDirty": text.is_dirty,
        "useModule": text.use_module,
    }


def main():
    arguments = sys.argv[sys.argv.index("--") + 1 :]
    if len(arguments) != 2:
        raise SystemExit("usage: blender -b --python check-text-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-text-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"text save/reopen drift: {before} != {after}")
    value = {"schemaVersion": 1, "task": "M16-GAP-00024", "operation": "TEXT_DATABLOCK_DESKTOP", "fixture": str(fixture), "fixtureSha256": hashlib.sha256(fixture.read_bytes()).hexdigest(), "text": 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"text-desktop-ok id={after['id']} bytes={after['byteLength']} saveReopen=exact")


if __name__ == "__main__":
    main()