import json
import os
from pathlib import Path
from typing import Any, Dict, List, Optional

from agent.tools import tool, ToolResult

# 完整图数据库文件路径（包含 edges）
GRAPH_FULL_DATA_PATH = os.getenv(
    "GRAPH_FULL_DATA_PATH",
    # str(Path(__file__).parent.parent / "data/library/item_graph/item_graph_full_all_levels.json")
    str(Path(__file__).parent.parent / "data/library/apriori_analysis_post_level/frequent_itemsets_multi_depth_index.json")
)

# 缓存图数据，避免重复加载
_graph_full_cache: Optional[Dict[str, Any]] = None


def _load_graph_full() -> Dict[str, Any]:
    """加载完整图数据（带缓存，包含 edges）"""
    global _graph_full_cache
    if _graph_full_cache is None:
        with open(GRAPH_FULL_DATA_PATH, 'r', encoding='utf-8') as f:
            _graph_full_cache = json.load(f)
    return _graph_full_cache


def _search_pattern(class_paths: List[str], top_k: int = 10) -> Dict[str, Any]:
    graph = _load_graph_full()

    index = graph.get("index", {})
    items = graph.get("items", {})
    results = {}

    for class_path in class_paths:
        groups = index.get(class_path, [])
        print(groups)
        results[class_path] = []
        for group in groups:
            print(group)
            results[class_path].append(items.get(group, []))

    return results


@tool(
    description="根据类别路径查找包含这些类别的所有模式组合。返回每个类别所在的所有频繁项集。",
    display={
        "zh": {
            "name": "模式组合检索",
            "params": {
                "class_paths": "类别路径数组",
                "top_k": "每个类别返回的组合数量（默认10）",
            },
        },
    },
)
async def search_pattern(
    class_paths: List[str],
    top_k: int = 10
) -> ToolResult:
    """
    根据类别路径查找包含这些类别的所有模式组合。

    Args:
        class_paths: 类别路径数组，如 ["关键点_形式_架构>策略>行为体验"]
        top_k: 每个类别返回前 K 个组合，默认 10

    Returns:
        ToolResult: 每个类别及其所在的所有组合
    """
    if not class_paths or len(class_paths) == 0:
        return ToolResult(
            title="模式组合检索失败",
            output="",
            error="请提供类别路径",
        )

    try:
        result = _search_pattern(class_paths, top_k)
    except FileNotFoundError:
        return ToolResult(
            title="模式组合检索失败",
            output="",
            error=f"图数据文件不存在: {GRAPH_FULL_DATA_PATH}",
        )
    except Exception as e:
        return ToolResult(
            title="模式组合检索失败",
            output="",
            error=f"检索异常: {str(e)}",
        )

    # 统计总共找到的组合数
    total_patterns = sum(len(patterns) for patterns in result.values())

    # 限制返回数量
    limited_result = {}
    for class_path, patterns in result.items():
        limited_result[class_path] = patterns

    output = json.dumps(limited_result, ensure_ascii=False, indent=2)
    return ToolResult(
        title=f"模式组合检索 - {len(class_paths)} 个类别",
        output=output,
        long_term_memory=f"为 {len(class_paths)} 个类别检索到 {total_patterns} 个模式组合）",
    )

if __name__ == "__main__":
    print(_search_pattern(["关键点_形式_架构>叙事>叙事形式"]))