from __future__ import annotations

import json
from dataclasses import dataclass
from typing import Any


@dataclass(frozen=True)
class TransportProtocolInfo:
    protocol: str = ""
    transport: str = ""
    security: str = ""

    def summary(self) -> str:
        proto = self.protocol if self.protocol else "n/a"
        transport = self.transport if self.transport else "n/a"
        security = self.security if self.security else "n/a"
        return f"{proto} / {transport} / {security}"


def transport_protocol_info(client: Any) -> TransportProtocolInfo:
    cfg = _as_dict(getattr(client, "config", {}) or {})
    protocol = _first_non_empty(
        cfg.get("protocol"),
        cfg.get("profile_protocol"),
        cfg.get("outbound"),
        cfg.get("type"),
    ).lower()
    transport = _first_non_empty(
        cfg.get("transport"),
        cfg.get("network"),
        cfg.get("stream"),
    ).lower()
    security = _normalize_security(
        _first_non_empty(
            cfg.get("security"),
            cfg.get("tls_security"),
            cfg.get("security_mode"),
        )
    )

    if not protocol or not transport or not security:
        raw_cfg = _load_raw_config_from_client_config(cfg)
        if raw_cfg:
            p2, t2, s2 = _infer_from_raw_config(raw_cfg)
            if not protocol and p2:
                protocol = p2
            if not transport and t2:
                transport = t2
            if not security and s2:
                security = s2

    if protocol and not transport:
        transport = _default_transport_for_protocol(protocol)
    if protocol and not security:
        security = "none"
    return TransportProtocolInfo(protocol=protocol, transport=transport, security=security)


def transport_protocol_summary(client: Any) -> str:
    return transport_protocol_info(client).summary()


def _infer_from_raw_config(raw_cfg: dict[str, Any]) -> tuple[str, str, str]:
    outbounds = raw_cfg.get("outbounds") or []
    if isinstance(outbounds, list):
        for row in outbounds:
            if not isinstance(row, dict):
                continue
            out_type = str(row.get("type") or "").strip().lower()
            if not out_type or out_type in ("direct", "block", "dns"):
                continue
            tx = ""
            transport_obj = row.get("transport")
            if isinstance(transport_obj, dict):
                tx = str(transport_obj.get("type") or "").strip().lower()
            if not tx:
                tx = str(row.get("network") or "").strip().lower()
            sec = _extract_security(row)
            return out_type, tx, sec

    inbounds = raw_cfg.get("inbounds") or []
    if isinstance(inbounds, list):
        for row in inbounds:
            if not isinstance(row, dict):
                continue
            in_type = str(row.get("type") or "").strip().lower()
            if not in_type:
                continue
            network = str(row.get("network") or "").strip().lower()
            sec = _extract_security(row)
            return in_type, network, sec

    return "", "", ""


def _load_raw_config_from_client_config(cfg: dict[str, Any]) -> dict[str, Any]:
    path = _first_non_empty(
        cfg.get("config_path"),
        cfg.get("singbox_config_path"),
        cfg.get("raw_config_path"),
    )
    if not path:
        return {}
    try:
        with open(path, "r", encoding="utf-8") as f:
            parsed = json.load(f)
    except Exception:
        return {}
    if not isinstance(parsed, dict):
        return {}
    return parsed


def _as_dict(raw: Any) -> dict[str, Any]:
    return raw if isinstance(raw, dict) else {}


def _normalize_security(value: str) -> str:
    sec = str(value or "").strip().lower()
    if not sec:
        return ""
    aliases = {
        "off": "none",
        "disabled": "none",
        "plain": "none",
        "reality-tls": "reality",
        "xtls": "tls",
    }
    return aliases.get(sec, sec)


def _extract_security(node: dict[str, Any]) -> str:
    sec = _normalize_security(_first_non_empty(node.get("security"), node.get("tls_security")))
    if sec:
        return sec

    tls = _as_dict(node.get("tls"))
    if not tls:
        return ""
    enabled_raw = tls.get("enabled")
    if enabled_raw is False:
        return "none"

    reality = _as_dict(tls.get("reality"))
    if reality:
        if _truthy(reality.get("enabled")):
            return "reality"
        if _first_non_empty(reality.get("public_key"), reality.get("short_id"), reality.get("short_ids")):
            return "reality"
    return "tls"


def _truthy(raw: Any) -> bool:
    if isinstance(raw, bool):
        return raw
    if isinstance(raw, int):
        return raw != 0
    if isinstance(raw, str):
        return raw.strip().lower() in ("1", "true", "yes", "on")
    return False


def _default_transport_for_protocol(protocol: str) -> str:
    p = str(protocol or "").strip().lower()
    if p in ("vless", "trojan", "shadowsocks", "socks", "http"):
        return "tcp"
    if p in ("wireguard", "hysteria2", "tuic"):
        return "udp"
    return ""


def _first_non_empty(*values: Any) -> str:
    for value in values:
        s = str(value or "").strip()
        if s:
            return s
    return ""