"""资产数据库汇总脚本。

读取 asset-catalog 的扫描结果（meshes/*.json），汇总为统一的单文件
asset_database.json，以资产名为 key 扁平化存储。

此脚本不依赖 UE5，可离线运行。

用法:
  python build_database.py [--input DIR] [--output FILE]

  --input   扫描输出目录，默认 tools/asset-catalog/outputs
  --output  输出文件路径，默认 <input>/asset_database.json
"""

import sys
import argparse
from pathlib import Path

_SCRIPT_DIR = Path(__file__).resolve().parent
if str(_SCRIPT_DIR) not in sys.path:
    sys.path.insert(0, str(_SCRIPT_DIR))

from _common import read_json, write_json, iso_now

TAG = "[BuildDB]"


def build_database(input_dir: Path, output_file: Path) -> dict:
    """汇总 meshes/*.json 为统一数据库。

    Args:
        input_dir: 包含 meshes/ 子目录的扫描输出根目录
        output_file: 输出的 asset_database.json 路径

    Returns:
        统计信息 dict
    """
    meshes_dir = input_dir / "meshes"
    if not meshes_dir.exists():
        print(f"{TAG} 错误: {meshes_dir} 不存在，请先运行 analyze_meshes")
        return {"status": "error", "reason": "no meshes dir"}

    # 收集所有子目录的扫描文件
    mesh_files = sorted(meshes_dir.glob("*.json"))
    if not mesh_files:
        print(f"{TAG} 错误: {meshes_dir} 下无 JSON 文件")
        return {"status": "error", "reason": "no mesh files"}

    print(f"{TAG} 发现 {len(mesh_files)} 个扫描文件")

    # 扁平化合并
    assets = {}
    total = 0
    skipped = 0

    for mf in mesh_files:
        try:
            data = read_json(mf)
        except Exception as e:
            print(f"{TAG} 警告: 读取 {mf.name} 失败: {e}")
            continue

        subfolder = data.get("subfolder", mf.stem)
        meshes = data.get("meshes", {})
        if not meshes:
            continue

        for name, mesh_data in meshes.items():
            total += 1

            # 跳过无包围盒的（加载失败的）
            if mesh_data.get("bounding_box") is None:
                skipped += 1
                continue

            # 构建统一条目
            entry = {
                "ue_path": mesh_data.get("ue_path", ""),
                "subfolder": subfolder,
                "bounding_box": mesh_data.get("bounding_box"),
                "pivot": mesh_data.get("pivot"),
                "mesh_complexity": mesh_data.get("mesh_complexity", {}),
                "material_slots": mesh_data.get("material_slots", []),
                "sockets": mesh_data.get("sockets", []),
                "tags": {
                    "style": mesh_data.get("style_tags", []),
                    "scene": mesh_data.get("scene_tags", []),
                },
                "ai_inference": None,
            }

            # 如果资产名重复（不同子目录下同名），加后缀
            key = name
            if key in assets:
                safe_sub = subfolder.replace("/", "_").replace("\\", "_")
                key = f"{name}_{safe_sub}"
                print(f"{TAG} 注意: 资产名重复 {name}，使用 {key}")

            assets[key] = entry

    # 写入数据库
    db = {
        "metadata": {
            "generated_at": iso_now(),
            "source": "asset_catalog_v1",
            "total_assets": len(assets),
            "skipped_no_bbox": skipped,
            "input_files": [mf.name for mf in mesh_files],
        },
        "assets": assets,
    }

    write_json(db, output_file)
    print(f"{TAG} ✅ 汇总完成: {len(assets)} 个资产 → {output_file}")
    print(f"{TAG}    跳过 {skipped} 个无包围盒资产 / 总计 {total}")

    return {
        "status": "ok",
        "total": total,
        "assets": len(assets),
        "skipped": skipped,
    }


def main():
    parser = argparse.ArgumentParser(description="汇总资产扫描数据为统一 JSON 数据库")
    parser.add_argument(
        "--input", type=str,
        default=str(_SCRIPT_DIR / "outputs"),
        help="扫描输出目录 (默认: tools/asset-catalog/outputs)",
    )
    parser.add_argument(
        "--output", type=str, default=None,
        help="输出文件路径 (默认: <input>/asset_database.json)",
    )
    args = parser.parse_args()

    input_dir = Path(args.input)
    output_file = Path(args.output) if args.output else input_dir / "asset_database.json"

    result = build_database(input_dir, output_file)
    if result.get("status") != "ok":
        sys.exit(1)


if __name__ == "__main__":
    main()