#!/usr/bin/env python3
"""Generate the Blender 5.2 RNA data-block type inventory from the pinned runtime."""

import hashlib
import json
import pathlib
import sys

import bpy


def decode(value):
    return value.decode("utf-8", errors="replace") if isinstance(value, bytes) else str(value)


def binary_sha256(path):
    digest = hashlib.sha256()
    with open(path, "rb") as handle:
        for block in iter(lambda: handle.read(1024 * 1024), b""):
            digest.update(block)
    return digest.hexdigest()


def main():
    if "--" not in sys.argv or len(sys.argv[sys.argv.index("--") + 1:]) != 1:
        raise SystemExit("usage: blender --background --factory-startup --python generate-blender-rna-datablock-inventory.py -- OUTPUT.json")
    output = pathlib.Path(sys.argv[sys.argv.index("--") + 1]).resolve()
    version = tuple(int(value) for value in bpy.app.version)
    if version != (5, 2, 0):
        raise RuntimeError(f"expected Blender 5.2.0, got {version}")
    binary_path = pathlib.Path(bpy.app.binary_path).resolve()
    entries = []
    for cls in bpy.types.ID.__subclasses__():
        rna = getattr(cls, "bl_rna", None)
        identifier = getattr(rna, "identifier", "") if rna else ""
        if not identifier:
            raise RuntimeError(f"RNA ID type {cls.__name__} has no identifier")
        entries.append({
            "parityId": f"BLENDER52_RNA_ID_{identifier.upper()}",
            "rnaIdentifier": identifier,
            "typeName": cls.__name__,
            "baseType": "ID",
            "sourceAnchor": "blender-5.2.0/source/blender/makesrna",
        })
    entries.sort(key=lambda entry: (entry["rnaIdentifier"], entry["typeName"]))
    identifiers = [entry["rnaIdentifier"] for entry in entries]
    if len(identifiers) != len(set(identifiers)):
        raise RuntimeError("duplicate RNA data-block identifier")
    inventory = {
        "schemaVersion": 1,
        "task": "M15-01A",
        "operation": "BLENDER_RNA_DATABLOCK_INVENTORY",
        "sourceAnchor": "blender-5.2.0/source/blender/makesrna",
        "runtime": {
            "blenderVersion": decode(bpy.app.version_string),
            "versionTuple": list(version),
            "buildHash": decode(bpy.app.build_hash),
            "buildBranch": decode(bpy.app.build_branch),
            "buildPlatform": decode(bpy.app.build_platform),
            "buildType": decode(bpy.app.build_type),
            "buildDate": decode(bpy.app.build_date),
            "buildTime": decode(bpy.app.build_time),
            "binarySha256": binary_sha256(binary_path),
        },
        "summary": {"count": len(entries), "baseType": "ID"},
        "dataBlockTypes": entries,
        "nextTask": "M15-01B",
    }
    output.parent.mkdir(parents=True, exist_ok=True)
    output.write_text(json.dumps(inventory, indent=2, sort_keys=True) + "\n", encoding="utf-8")
    print(f"blender-rna-datablock-inventory-generated count={len(entries)} blender={bpy.app.version_string} output={output}")


if __name__ == "__main__":
    main()