"""Network status for the web interface (read-only, no privileges needed)."""

from __future__ import annotations

import json
import re
import shutil
import subprocess
from pathlib import Path
from typing import Any

from .netconfig import INTERFACES, profile_name, split_terse

STATE_LABELS = {
    "connected": "Verbonden",
    "connecting": "Bezig met verbinden",
    "disconnected": "Niet verbonden",
    "unavailable": "Niet beschikbaar",
    "unmanaged": "Niet beheerd",
}


def _nmcli(*args: str) -> str | None:
    if not shutil.which("nmcli"):
        return None
    try:
        proc = subprocess.run(["nmcli", *args], capture_output=True, text=True, timeout=10)
    except (OSError, subprocess.SubprocessError):
        return None
    return proc.stdout if proc.returncode == 0 else None


def device_details(device: str) -> dict[str, Any]:
    out = _nmcli("-t", "device", "show", device)
    info: dict[str, Any] = {"addresses": [], "dns": [], "gateway": "", "hwaddr": "", "state": "", "connection": ""}
    if not out:
        return info
    for line in out.splitlines():
        key, _, value = line.partition(":")
        value = value.replace("\\:", ":")
        base = key.split("[", 1)[0]
        if base == "IP4.ADDRESS" and value:
            info["addresses"].append(value)
        elif base == "IP4.DNS" and value:
            info["dns"].append(value)
        elif base == "IP4.GATEWAY" and value and value != "--":
            info["gateway"] = value
        elif base == "GENERAL.HWADDR":
            info["hwaddr"] = value
        elif base == "GENERAL.STATE":
            info["state"] = re.sub(r"^\d+\s*", "", value).strip("() ")
        elif base == "GENERAL.CONNECTION" and value != "--":
            info["connection"] = value
    return info


def profile_settings(interface: str) -> dict[str, Any]:
    """Current settings of our own profile, used to pre-fill the forms."""
    out = _nmcli("-t", "-f", "ipv4.method,ipv4.addresses,ipv4.gateway,ipv4.dns,802-11-wireless.ssid,802-11-wireless.hidden",
                 "connection", "show", profile_name(interface))
    settings = {"exists": False, "method": "dhcp", "address": "", "gateway": "", "dns": "", "ssid": "", "hidden": False}
    if not out:
        return settings
    settings["exists"] = True
    for line in out.splitlines():
        key, _, value = line.partition(":")
        value = value.replace("\\:", ":")
        if value == "--":
            value = ""
        if key == "ipv4.method":
            settings["method"] = "static" if value == "manual" else "dhcp"
        elif key == "ipv4.addresses":
            settings["address"] = value.split(",")[0].strip()
        elif key == "ipv4.gateway":
            settings["gateway"] = value
        elif key == "ipv4.dns":
            settings["dns"] = ", ".join(x for x in value.split(",") if x)
        elif key == "802-11-wireless.ssid":
            settings["ssid"] = value
        elif key == "802-11-wireless.hidden":
            settings["hidden"] = value == "yes"
    return settings


def overview() -> dict[str, Any]:
    available = shutil.which("nmcli") is not None
    devices = {}
    status = _nmcli("-t", "-f", "DEVICE,TYPE,STATE,CONNECTION", "device", "status") or ""
    present = {split_terse(line)[0]: split_terse(line) for line in status.splitlines() if line}
    for iface, kind in INTERFACES.items():
        fields = present.get(iface)
        details = device_details(iface) if fields else {}
        state = fields[2] if fields and len(fields) > 2 else ""
        devices[iface] = {
            "interface": iface,
            "kind": kind,
            "present": fields is not None,
            "state": state,
            "state_label": STATE_LABELS.get(state, state or "Niet aanwezig"),
            "connected": state == "connected",
            "connection": fields[3] if fields and len(fields) > 3 and fields[3] != "--" else "",
            "addresses": details.get("addresses", []),
            "gateway": details.get("gateway", ""),
            "dns": details.get("dns", []),
            "hwaddr": details.get("hwaddr", ""),
            "profile": profile_settings(iface) if available else {},
        }
    return {"available": available, "devices": devices, "wifi_country": wifi_country()}


def wifi_country() -> str:
    if not shutil.which("iw"):
        return ""
    try:
        out = subprocess.run(["iw", "reg", "get"], capture_output=True, text=True, timeout=5).stdout
    except (OSError, subprocess.SubprocessError):
        return ""
    match = re.search(r"country ([A-Z0-9]{2}):", out)
    return match.group(1) if match and match.group(1) != "00" else ""


def pending_change(pending_file: Path) -> dict[str, Any] | None:
    try:
        data = json.loads(pending_file.read_text(encoding="utf-8"))
    except (OSError, ValueError):
        return None
    return data if isinstance(data, dict) else None