"""
统一路径配置模块 - 兼容多环境

支持的环境:
1. AMLT 集群: /backup/...
2. 本地开发 (home): ~/backup/...
3. ZMS 集群: /mnt/data/zms/backup/...

使用方式:
    from tools.path_config import PathConfig
    
    # 获取路径
    asset_library = PathConfig.get_asset_library_path()
    voxel_cache = PathConfig.get_voxel_cache_path()
    
    # 或使用环境变量覆盖
    export PTH_ASSET_LIBRARY="/custom/path/asset_library"
"""

import os
from pathlib import Path


class PathConfig:
    """统一路径配置类，自动检测环境并返回正确路径"""
    
    # 环境检测顺序 (优先级从高到低)
    _BACKUP_CANDIDATES = [
        "/backup",                          # AMLT 集群
        "/mnt/data/zms/backup",             # ZMS 集群
        os.path.expanduser("~/backup"),     # 本地开发
    ]
    
    _backup_base = None  # 缓存检测结果
    
    @classmethod
    def get_backup_base(cls) -> str:
        """获取 backup 基础路径，自动检测环境"""
        if cls._backup_base is not None:
            return cls._backup_base
        
        # 1. 优先使用环境变量
        if os.environ.get("BACKUP_BASE"):
            cls._backup_base = os.environ["BACKUP_BASE"]
            return cls._backup_base
        
        # 2. 自动检测
        for candidate in cls._BACKUP_CANDIDATES:
            check_path = os.path.join(candidate, "datas/InternScenes")
            if os.path.exists(check_path):
                cls._backup_base = candidate
                print(f"[PathConfig] Detected backup base: {cls._backup_base}")
                return cls._backup_base
        
        # 3. 默认使用 home 目录
        cls._backup_base = os.path.expanduser("~/backup")
        print(f"[PathConfig] Using default backup base: {cls._backup_base}")
        return cls._backup_base
    
    @classmethod
    def get_asset_library_path(cls) -> str:
        """获取 asset_library 路径"""
        env_path = os.environ.get("PTH_ASSET_LIBRARY")
        if env_path and os.path.exists(env_path):
            return env_path
        return os.path.join(cls.get_backup_base(), "datas/InternScenes/asset_library")
    
    @classmethod
    def get_asset_normalized_library_path(cls) -> str:
        """获取 asset_library_normalized 路径"""
        env_path = os.environ.get("PTH_ASSET_NORMALIZED_LIBRARY")
        if env_path and os.path.exists(env_path):
            return env_path
        return os.path.join(cls.get_backup_base(), "datas/InternScenes/asset_library_normalized")
    
    @classmethod
    def get_voxel_cache_path(cls) -> str:
        """获取 voxel_cache 路径"""
        env_path = os.environ.get("PTH_VOXEL_CACHE")
        if env_path:
            return env_path
        return os.path.join(cls.get_backup_base(), "datas/InternScenes/voxel_cache")
    
    @classmethod
    def get_sft_model_path(cls, checkpoint: str = "checkpoint-1100") -> str:
        """获取 SFT 模型路径"""
        env_path = os.environ.get("PTH_SFT_MODEL")
        if env_path and os.path.exists(env_path):
            return env_path
        return os.path.join(cls.get_backup_base(), f"llm3d/sft_output/full_20251215_002635/{checkpoint}")
    
    @classmethod
    def get_checkpoint_dir(cls, experiment_name: str) -> str:
        """获取训练 checkpoint 目录"""
        return os.path.join(cls.get_backup_base(), f"llm3d/grpo_checkpoints/{experiment_name}")
    
    @classmethod
    def get_output_dir(cls, experiment_name: str) -> str:
        """获取训练输出目录"""
        return os.path.join(cls.get_backup_base(), f"llm3d/grpo/{experiment_name}")
    
    @classmethod
    def get_unified_layout_path(cls) -> str:
        """获取 unified-layout-aligned 路径"""
        return os.path.join(cls.get_backup_base(), "datas/unified-layout-aligned")
    
    @classmethod
    def get_layout_info_path(cls) -> str:
        """获取 Layout_info 路径"""
        return os.path.join(cls.get_backup_base(), "datas/InternScenes/Layout_info")
    
    @classmethod
    def print_config(cls):
        """打印当前路径配置"""
        print("=" * 60)
        print("PathConfig - Current Configuration")
        print("=" * 60)
        print(f"BACKUP_BASE: {cls.get_backup_base()}")
        print(f"Asset Library: {cls.get_asset_library_path()}")
        print(f"Asset Normalized: {cls.get_asset_normalized_library_path()}")
        print(f"Voxel Cache: {cls.get_voxel_cache_path()}")
        print(f"SFT Model: {cls.get_sft_model_path()}")
        print("=" * 60)


# 便捷函数
def get_backup_base() -> str:
    return PathConfig.get_backup_base()

def get_asset_library_path() -> str:
    return PathConfig.get_asset_library_path()

def get_asset_normalized_library_path() -> str:
    return PathConfig.get_asset_normalized_library_path()

def get_voxel_cache_path() -> str:
    return PathConfig.get_voxel_cache_path()


if __name__ == "__main__":
    PathConfig.print_config()