"""高级 ACL 操作：按备注前缀管理分组的 dst_addr 集合。

实现 get_all_test_ips, add_ip, del_ip 三个高级接口，依赖低级接口
在 `acl_actions` 中提供的函数，以及 `auth_session.load_config`。

实现注意点：
- 使用线程锁串行化写操作以降低竞态；写回失败则返回错误信息。
- 不对 IP 段展开，直接以字符串方式处理 dst_addr 的逗号分隔项。
"""
from __future__ import annotations

import threading
from typing import List, Dict, Tuple, Optional, Set

from log_util import get_logger
from auth_session import load_config
import acl_actions

logger = get_logger("advanced_acl")

# 本地锁：序列化对 ACL 的修改请求以降低竞态
_lock = threading.Lock()


def _parse_dst_addr(dst: str) -> List[str]:
    if not dst:
        return []
    parts = [p.strip() for p in dst.split(",") if p.strip()]
    return parts


def _join_dst_addr(parts: List[str]) -> str:
    return ",".join(parts)


def _load_settings() -> Tuple[str, int]:
    cfg = load_config()
    prefix = cfg.get("test_prefix", "Test_")
    limit = int(cfg.get("rule_ip_limit", 1000))
    return prefix, limit


def get_all_test_ips() -> List[str]:
    """返回所有以 test_prefix 前缀命名规则的合并去重 IP 列表（字符串形式）。"""
    prefix, _ = _load_settings()
    resp, data = acl_actions.get_acl_rules()
    ips: Set[str] = set()

    if not data:
        return []

    # Data.data is expected to be a list of rules; support a couple of shapes
    rules = data.get("Data", {}).get("data") if isinstance(data.get("Data"), dict) else data.get("Data")
    if rules is None:
        # try common structure
        rules = data.get("data") or []

    for rule in rules:
        comment = rule.get("comment", "")
        if not comment or not comment.startswith(prefix):
            continue
        dst = rule.get("dst_addr", "")
        for ip in _parse_dst_addr(dst):
            ips.add(ip)

    return sorted(ips)


def _collect_prefixed_rules() -> List[Dict]:
    """Return list of rule dicts that have comment starting with prefix, sorted by numeric suffix."""
    prefix, _ = _load_settings()
    resp, data = acl_actions.get_acl_rules()
    if not data:
        return []

    rules = data.get("Data", {}).get("data") if isinstance(data.get("Data"), dict) else data.get("Data")
    if rules is None:
        rules = data.get("data") or []

    matched = []
    for rule in rules:
        comment = rule.get("comment", "")
        if comment and comment.startswith(prefix):
            matched.append(rule)

    # sort by numeric suffix if present, else lexicographically
    def _key(r: Dict):
        c = r.get("comment", "")
        s = c[len(prefix):]
        try:
            return int(s)
        except Exception:
            return float("inf")

    matched.sort(key=_key)
    return matched


def add_ip(ip: str) -> Dict:
    """Add a single IP to the Test_* grouped rules.

    返回 dict: {"added": bool, "rule": str|None, "row_id": int|None, "message": str}
    """
    prefix, limit = _load_settings()
    # 快速存在性检查
    current = set(get_all_test_ips())
    if ip in current:
        return {"added": False, "message": "already exists", "rule": None, "row_id": None}

    # 串行化修改操作
    with _lock:
        # 重新获取并解析规则，避免竞态
        rules = _collect_prefixed_rules()

        # 尝试放入已有规则
        for rule in rules:
            rid = rule.get("id") or rule.get("ID") or rule.get("RowId")
            comment = rule.get("comment", "")
            dst = rule.get("dst_addr", "")
            parts = _parse_dst_addr(dst)
            if len(parts) + 1 <= limit:
                # 将 IP 附加并编辑
                if ip in parts:
                    return {"added": False, "message": "already exists after recheck", "rule": comment, "row_id": rid}
                parts.append(ip)
                new_dst = _join_dst_addr(parts)
                try:
                    resp, data = acl_actions.edit_acl_rule(rule_id=rid, dst_addr=new_dst, comment=comment)
                except Exception as e:
                    logger.exception("edit_acl_rule 调用失败")
                    return {"added": False, "message": f"edit failed: {e}", "rule": comment, "row_id": rid}

                # 检查响应是否成功（保守判断：HTTP 200 且返回非空 JSON）
                if resp.status_code == 200:
                    return {"added": True, "rule": comment, "row_id": (data.get("RowId") if isinstance(data, dict) else None), "message": "ok"}
                else:
                    return {"added": False, "message": f"edit returned {resp.status_code}", "rule": comment, "row_id": rid}

        # 如果没有可放的规则，则创建新的规则
        # 确定新规则编号
        if not rules:
            new_idx = 1
        else:
            # 尝试解析最大编号
            last = rules[-1].get("comment", "")
            try:
                last_idx = int(last[len(prefix):])
                new_idx = last_idx + 1
            except Exception:
                new_idx = len(rules) + 1

        new_comment = f"{prefix}{new_idx}"
        try:
            resp, data = acl_actions.add_acl_rule(dst_addr=ip, comment=new_comment)
        except Exception as e:
            logger.exception("add_acl_rule 调用失败")
            return {"added": False, "message": f"add failed: {e}", "rule": new_comment, "row_id": None}

        if resp.status_code == 200:
            row_id = data.get("RowId") if isinstance(data, dict) else None
            return {"added": True, "rule": new_comment, "row_id": row_id, "message": "ok"}
        else:
            return {"added": False, "message": f"add returned {resp.status_code}", "rule": new_comment, "row_id": None}


def del_ip(ip: str) -> Dict:
    """Delete IP from all Test_* rules.

    返回 dict: {"deleted": bool, "affected": [ {"rule_id": id, "comment": str, "action": "edited"|"deleted"} ], "message": str}
    """
    prefix, _ = _load_settings()
    affected = []

    with _lock:
        rules = _collect_prefixed_rules()
        found = False
        for rule in rules:
            rid = rule.get("id") or rule.get("ID") or rule.get("RowId")
            comment = rule.get("comment", "")
            dst = rule.get("dst_addr", "")
            parts = _parse_dst_addr(dst)
            if ip in parts:
                found = True
                parts = [p for p in parts if p != ip]
                if parts:
                    new_dst = _join_dst_addr(parts)
                    try:
                        resp, data = acl_actions.edit_acl_rule(rule_id=rid, dst_addr=new_dst, comment=comment)
                    except Exception as e:
                        logger.exception("edit_acl_rule 调用失败")
                        affected.append({"rule_id": rid, "comment": comment, "action": "error", "message": str(e)})
                        continue

                    if resp.status_code == 200:
                        affected.append({"rule_id": rid, "comment": comment, "action": "edited"})
                    else:
                        affected.append({"rule_id": rid, "comment": comment, "action": "error", "message": f"edit returned {resp.status_code}"})
                else:
                    # 删除该规则
                    try:
                        resp, data = acl_actions.del_acl_rule(rule_id=rid)
                    except Exception as e:
                        logger.exception("del_acl_rule 调用失败")
                        affected.append({"rule_id": rid, "comment": comment, "action": "error", "message": str(e)})
                        continue

                    if resp.status_code == 200:
                        affected.append({"rule_id": rid, "comment": comment, "action": "deleted"})
                    else:
                        affected.append({"rule_id": rid, "comment": comment, "action": "error", "message": f"del returned {resp.status_code}"})

        if not found:
            return {"deleted": False, "affected": [], "message": "not found"}
        return {"deleted": True, "affected": affected, "message": "ok"}


__all__ = ["get_all_test_ips", "add_ip", "del_ip"]