# service/GraphStyleService.py
import json
from util.mysql_utils import mysql_client

class GraphStyleService:
    @staticmethod
    def save_config(canvas_name: str, current_label: str, styles_dict: dict, group_name: str = None) -> bool:
        """
        保存图谱样式配置（增强版：自动处理分组逻辑）
        :param canvas_name: 画布显示名称
        :param current_label: 针对的标签名称
        :param styles_dict: 样式字典
        :param group_name: 分组名称（前端传来的字符串）
        """
        # 1. 处理分组逻辑：查不到就建，查到了就用
        if not group_name or group_name.strip() == "":
            group_name = "默认方案"

        # 检查组名是否已存在
        check_group_sql = "SELECT id FROM graph_style_groups WHERE group_name = %s LIMIT 1"
        existing_group = mysql_client.execute_query(check_group_sql, (group_name,))

        if existing_group:
            # 如果存在，直接使用已有 ID
            target_group_id = existing_group[0]['id']
        else:
            # 如果不存在，新建一个组
            create_group_sql = "INSERT INTO graph_style_groups (group_name) VALUES (%s)"
            mysql_client.execute_update(create_group_sql, (group_name,))
            # 获取新生成的 ID
            get_id_sql = "SELECT LAST_INSERT_ID() as last_id"
            id_res = mysql_client.execute_query(get_id_sql)
            target_group_id = id_res[0]['last_id'] if id_res else 1

        # 2. 转换样式 JSON
        config_json = json.dumps(styles_dict, ensure_ascii=False)

        # 3. 插入配置表（关联 target_group_id）
        sql = """
            INSERT INTO graph_configs (canvas_name, current_label, config_json, group_id)
            VALUES (%s, %s, %s, %s)
        """
        affected_rows = mysql_client.execute_update(sql, (canvas_name, current_label, config_json, target_group_id))
        return affected_rows > 0

    @staticmethod
    def get_grouped_configs() -> list:
        """
        核心优化：获取嵌套结构的方案列表 (Group -> Configs)
        用于前端右侧折叠面板展示
        """
        # 1. 查询所有方案组
        groups_sql = "SELECT id, group_name FROM graph_style_groups ORDER BY id ASC"
        groups = mysql_client.execute_query(groups_sql) or []

        # 2. 查询所有配置项
        configs_sql = "SELECT id, group_id, canvas_name, current_label, config_json, create_time FROM graph_configs"
        configs = mysql_client.execute_query(configs_sql) or []

        # 3. 内存聚合：将配置项塞进对应的组
        # 先处理配置项的 JSON 和 时间
        for conf in configs:
            if conf.get('config_json'):
                try:
                    conf['styles'] = json.loads(conf['config_json'])
                except:
                    conf['styles'] = {}
                del conf['config_json']

            if conf.get('create_time') and not isinstance(conf['create_time'], str):
                conf['create_time'] = conf['create_time'].strftime('%Y-%m-%d %H:%M:%S')

        # 组装数据结构
        result = []
        for g in groups:
            # 找到属于该组的所有配置
            g_children = [c for c in configs if c['group_id'] == g['id']]
            g['configs'] = g_children
            # 增加一个前端控制开关用的字段
            g['expanded'] = False
            result.append(g)

        return result

    @staticmethod
    def get_all_configs() -> list:
        """保持原有的扁平查询功能，仅增加 group_id 字段返回"""
        sql = "SELECT id, group_id, canvas_name, current_label, config_json, create_time FROM graph_configs ORDER BY create_time DESC"
        rows = mysql_client.execute_query(sql)
        if not rows: return []

        for row in rows:
            if row.get('config_json'):
                try: row['styles'] = json.loads(row['config_json'])
                except: row['styles'] = {}
                del row['config_json']
            if row.get('create_time') and not isinstance(row['create_time'], str):
                row['create_time'] = row['create_time'].strftime('%Y-%m-%d %H:%M:%S')
        return rows

    @staticmethod
    def delete_group(group_id: int) -> bool:
        """
        逻辑级联删除：删除方案组及其关联的所有配置
        """
        # 1. 删除组下的所有配置
        del_configs_sql = "DELETE FROM graph_configs WHERE group_id = %s"
        mysql_client.execute_update(del_configs_sql, (group_id,))

        # 2. 删除组本身
        del_group_sql = "DELETE FROM graph_style_groups WHERE id = %s"
        affected_rows = mysql_client.execute_update(del_group_sql, (group_id,))
        return affected_rows > 0

    @staticmethod
    def delete_config(config_id: int) -> bool:
        """删除单个配置"""
        sql = "DELETE FROM graph_configs WHERE id = %s"
        affected_rows = mysql_client.execute_update(sql, (config_id,))
        return affected_rows > 0

    @staticmethod
    def batch_delete_configs(config_ids: list) -> int:
        """批量删除配置"""
        if not config_ids: return 0
        try:
            clean_ids = [int(cid) for cid in config_ids if str(cid).isdigit()]
        except: return 0

        if not clean_ids: return 0
        placeholders = ', '.join(['%s'] * len(clean_ids))
        sql = f"DELETE FROM graph_configs WHERE id IN ({placeholders})"
        return mysql_client.execute_update(sql, tuple(clean_ids))

    @staticmethod
    def get_group_list() -> list:
        """单独获取方案名称列表，供前端下拉框使用"""
        sql = "SELECT id, group_name FROM graph_style_groups ORDER BY create_time DESC"
        return mysql_client.execute_query(sql) or []