import json
import sys
from pathlib import Path
from typing import Optional, Tuple

import requests

from log_util import get_logger, log_request
from auth_session import load_config, get_sess_key, get_base_url, get_host


ROOT = Path(__file__).resolve().parent
CONFIG_PATH = ROOT / "config.json"


def monitor_lanip(ip: str, interface: str = "all", proto: str = "all", maxnum: int = 100000, limit: str = "0,100000", timeout: int = 10) -> Tuple[requests.Response, Optional[dict]]:
	"""Call the monitor_lanip action and return (resp, json_data).

	Example payload:
	{"func_name":"monitor_lanip","action":"show","param":{"TYPE":"conn,conn_num","ip":"10.8.7.2","interface":"all","proto":"all","maxnum":500,"limit":"0,20","ORDER_BY":"","ORDER":""}}
	"""
	cfg = load_config()
	base = cfg.get("base_url", "").rstrip("/")
	url = f"{base}/Action/call"

	data = {
		"func_name": "monitor_lanip",
		"action": "show",
		"param": {
			"TYPE": "conn,conn_num",
			"ip": ip,
			"interface": interface,
			"proto": proto,
			"maxnum": maxnum,
			"limit": limit,
			"ORDER_BY": "",
			"ORDER": "",
		},
	}

	logger = get_logger("analysis_connections")

	sess_key = get_sess_key()
	if not sess_key:
		raise ValueError("未找到 sess_key，请先登录")

	cookies = {"sess_key": sess_key.split("=", 1)[-1].rstrip(";")}

	# Prepare headers including Origin/Referer/Host derived from config
	base = get_base_url()
	host = get_host()
	headers = {
		"Origin": base + "/",
		"Referer": base + "/",
		"Host": host,
		"User-Agent": "python-requests/advanced-client",
		"Accept": "application/json, text/plain, */*",
		"Content-Type": "application/json;charset=UTF-8",
	}

	logger.debug(f"准备发送请求，URL: {url} payload: {data} headers: {headers}")
	resp = requests.post(url, json=data, cookies=cookies, headers=headers, timeout=timeout)

	try:
		log_request(logger, "monitor_lanip", url, data, resp)
	except Exception:
		logger.exception("记录请求/响应失败")

	try:
		json_data = resp.json()
	except ValueError:
		json_data = None

	return resp, json_data


def main():
	logger = get_logger("main")
	if len(sys.argv) < 2:
		print("用法: python analysis_connections.py <ip>")
		sys.exit(2)
	ip = sys.argv[1]
	try:
		resp, data = monitor_lanip(ip)
	except FileNotFoundError as e:
		logger.error(f"配置错误: {e}")
		sys.exit(2)
	except ValueError as e:
		logger.error(f"会话错误: {e}")
		sys.exit(3)
	except requests.RequestException as e:
		logger.error(f"请求失败: {e}")
		sys.exit(1)

	logger.info(f"状态: {resp.status_code}")
	if data:
		try:
			pretty = json.dumps(data, ensure_ascii=False, indent=2)
			logger.info(f"响应 JSON:\n{pretty}")
			print(pretty)
		except Exception:
			logger.info(f"响应文本: {resp.text}")
			print(resp.text)
	else:
		logger.info(f"响应文本: {resp.text}")
		print(resp.text)


if __name__ == "__main__":
	main()


def find_high_connection_pairs(ip: str, threshold: int | None = None, limit: str = "0,100000") -> dict:
	"""Fetch connections for `ip` and return pairs (src_port, dst_addr) whose count > threshold.

	Returns a dict with keys: threshold, total_reported, fetched, matches (list of dicts).
	Each match: {"src_port": ..., "dst_addr": ..., "count": ..., "samples": [..sample entries..]}

	If threshold is None, will read `conn_threshold` from config.json (default 20).
	"""
	from collections import Counter

	cfg = load_config()
	cfg_threshold = cfg.get("conn_threshold", 20)
	if threshold is None:
		threshold = int(cfg_threshold)

	# fetch with large limit (caller may specify)
	resp, data = monitor_lanip(ip, limit=limit)
	result = {"threshold": threshold, "total_reported": None, "fetched": 0, "matches": []}

	if not data:
		return result


	def find_high_connections_for_src_ports(ip: str, src_ports, threshold: int | None = None, limit: str = "0,100000") -> dict:
		"""Analyze only the specified src_ports (single int or iterable) for given ip.

		Returns dict: {"threshold": n, "total_reported": x, "fetched": y, "by_src_port": {port: [{dst_addr, count, samples}, ...]}}
		"""
		from collections import Counter

		# normalize src_ports to a set of ints/strings
		if isinstance(src_ports, (int, str)):
			ports_set = {int(src_ports)}
		else:
			ports_set = {int(p) for p in src_ports}

		cfg = load_config()
		cfg_threshold = cfg.get("conn_threshold", 20)
		if threshold is None:
			threshold = int(cfg_threshold)

		resp, data = monitor_lanip(ip, limit=limit)
		result = {"threshold": threshold, "total_reported": None, "fetched": 0, "by_src_port": {}}

		if not data:
			return result

		total_reported = data.get("Data", {}).get("conn_num")
		conns = data.get("Data", {}).get("conn", []) or []
		result["total_reported"] = total_reported
		result["fetched"] = len(conns)

		# group by src_port then count dst_addr
		grouped: dict[int, Counter] = {}
		samples: dict[tuple, list] = {}
		for entry in conns:
			try:
				src_port = int(entry.get("src_port"))
			except Exception:
				continue
			if src_port not in ports_set:
				continue
			dst = entry.get("dst_addr")
			key = (src_port, dst)
			grouped.setdefault(src_port, Counter())[dst] += 1
			samples.setdefault(key, []).append(entry)

		for port in ports_set:
			counter = grouped.get(port, Counter())
			matches = []
			for dst, cnt in counter.items():
				if cnt > threshold:
					sample_list = samples.get((port, dst), [])[:5]
					matches.append({"dst_addr": dst, "count": cnt, "samples": sample_list})
			# sort
			matches.sort(key=lambda x: x["count"], reverse=True)
			result["by_src_port"][port] = matches

		return result

	total_reported = data.get("Data", {}).get("conn_num")
	conns = data.get("Data", {}).get("conn", []) or []
	result["total_reported"] = total_reported
	result["fetched"] = len(conns)

	# Count (src_port, dst_addr) pairs
	pairs = Counter()
	samples: dict[tuple, list] = {}
	for entry in conns:
		src_port = entry.get("src_port")
		dst = entry.get("dst_addr")
		key = (src_port, dst)
		pairs[key] += 1
		samples.setdefault(key, []).append(entry)

	for (src_port, dst), cnt in pairs.items():
		if cnt > threshold:
			sample_list = samples.get((src_port, dst), [])[:5]
			result["matches"].append({
				"src_port": src_port,
				"dst_addr": dst,
				"count": cnt,
				"samples": sample_list,
			})

	# sort matches by count desc
	result["matches"].sort(key=lambda x: x["count"], reverse=True)
	return result


def find_high_connections_for_src_ports(ip: str, src_ports, threshold: int | None = None, limit: str = "0,100000") -> dict:
	"""Analyze only the specified src_ports (single int or iterable) for given ip.

	Returns dict: {"threshold": n, "total_reported": x, "fetched": y, "by_src_port": {port: [{dst_addr, count, samples}, ...]}}
	"""
	from collections import Counter

	# normalize src_ports to a set of ints/strings
	if isinstance(src_ports, (int, str)):
		ports_set = {int(src_ports)}
	else:
		ports_set = {int(p) for p in src_ports}

	cfg = load_config()
	cfg_threshold = cfg.get("conn_threshold", 20)
	if threshold is None:
		threshold = int(cfg_threshold)

	resp, data = monitor_lanip(ip, limit=limit)
	result = {"threshold": threshold, "total_reported": None, "fetched": 0, "by_src_port": {}}

	if not data:
		return result

	total_reported = data.get("Data", {}).get("conn_num")
	conns = data.get("Data", {}).get("conn", []) or []
	result["total_reported"] = total_reported
	result["fetched"] = len(conns)

	# group by src_port then count dst_addr
	grouped: dict[int, Counter] = {}
	samples: dict[tuple, list] = {}
	for entry in conns:
		try:
			src_port = int(entry.get("src_port"))
		except Exception:
			continue
		if src_port not in ports_set:
			continue
		dst = entry.get("dst_addr")
		key = (src_port, dst)
		grouped.setdefault(src_port, Counter())[dst] += 1
		samples.setdefault(key, []).append(entry)

	for port in ports_set:
		counter = grouped.get(port, Counter())
		matches = []
		for dst, cnt in counter.items():
			if cnt > threshold:
				sample_list = samples.get((port, dst), [])[:5]
				matches.append({"dst_addr": dst, "count": cnt, "samples": sample_list})
		# sort
		matches.sort(key=lambda x: x["count"], reverse=True)
		result["by_src_port"][port] = matches

	return result