# -*- coding: utf-8 -*-
"""
F4: System-Pakete Uebersicht — Tabelle mit Status.
"""

from __future__ import annotations

import shutil
import subprocess

from textual.widgets import DataTable, Label, Static

from .base import InstallerView


# Kanonische Paketnamen mit Beschreibung und Typ
_RUNTIME_PACKAGES = [
    ("python3", "Python Interpreter", "Runtime"),
    ("python3-venv", "Python virtuelle Umgebungen", "Runtime"),
    ("python3-pip", "Python Paketmanager", "Runtime"),
    ("git", "Versionskontrolle", "Runtime"),
    ("curl", "Datentransfer", "Runtime"),
    ("wget", "Datei-Download", "Runtime"),
    ("alsa-utils", "ALSA Audio-Werkzeuge", "Runtime"),
    ("ffmpeg", "Audio/Video Konvertierung", "Runtime"),
]

_BUILD_PACKAGES = [
    ("python3-dev", "Python C-Extension Header", "Build"),
    ("portaudio-dev", "Audio-I/O (sounddevice)", "Build"),
    ("alsa-dev", "ALSA Header (pyalsaaudio)", "Build"),
    ("openblas-dev", "BLAS (numpy/scipy)", "Build"),
    ("lapack-dev", "LAPACK (scipy)", "Build"),
    ("gfortran", "Fortran Compiler (scipy)", "Build"),
    ("ffi-dev", "FFI (cryptography)", "Build"),
    ("ssl-dev", "SSL/TLS (cryptography/aiohttp)", "Build"),
]

_WIFI_PACKAGES = [
    ("hostapd", "WiFi Access Point", "WiFi"),
    ("dnsmasq", "DHCP/DNS Server", "WiFi"),
    ("iptables", "Firewall/NAT", "WiFi"),
]


def _detect_pm() -> tuple[str, list[str]]:
    """Erkennt den Paketmanager und gibt (name, check_cmd) zurueck."""
    managers = [
        ("apt", ["dpkg", "-s"]),
        ("dnf", ["rpm", "-q"]),
        ("pacman", ["pacman", "-Q"]),
        ("zypper", ["rpm", "-q"]),
    ]
    for name, check in managers:
        # Pruefe ob der Install-Befehl existiert
        install_cmd = {"apt": "apt-get", "dnf": "dnf", "pacman": "pacman", "zypper": "zypper"}
        if shutil.which(install_cmd.get(name, name)):
            return name, check
    return "", []


def _resolve_name(canonical: str, pm: str) -> str:
    """Loest kanonischen Namen fuer den Paketmanager auf."""
    # Importiere die Map aus dem Runner
    from ..runner import InstallRunner
    mapping = InstallRunner._PKG_MAP.get(canonical, {})
    return mapping.get(pm, canonical)


def _check_installed(pkg_name: str, check_cmd: list[str]) -> str:
    """Prueft ob ein Paket installiert ist."""
    # Zuerst: Kommandozeilen-Tool direkt pruefen
    simple = pkg_name.split("-")[0].replace("lib", "").replace("19", "")
    if shutil.which(pkg_name) or shutil.which(simple):
        return "Installiert"

    # python3 spezial
    if pkg_name in ("python3", "python3-venv", "python3-pip", "python"):
        return "Installiert" if shutil.which("python3") else "Fehlt"

    # Paketmanager fragen
    if check_cmd:
        try:
            result = subprocess.run(
                [*check_cmd, pkg_name],
                capture_output=True, timeout=3,
            )
            return "Installiert" if result.returncode == 0 else "Fehlt"
        except Exception:
            pass

    return "?"


class RequirementsView(InstallerView):
    """System-Pakete Uebersicht (F4)."""

    TITLE = "Pakete"
    VIEW_ID = "requirements"
    MODES = ["server", "client", "standalone", "config"]

    def compose(self):
        yield Static("── System-Pakete ──", classes="section-header")
        yield Label("", id="pkg-pm-info")
        yield DataTable(id="pkg-table")

    async def on_activate(self) -> None:
        """Fuellt die Tabelle beim Aktivieren."""
        pm_name, check_cmd = _detect_pm()

        # Paketmanager-Info
        info = self.query_one("#pkg-pm-info", Label)
        if pm_name:
            info.update(f"Paketmanager: {pm_name}\n")
        else:
            info.update("Kein unterstuetzter Paketmanager erkannt\n")

        table = self.query_one("#pkg-table", DataTable)
        table.clear(columns=True)
        table.add_columns("Typ", "Paket", "Zweck", "Status")

        # Runtime
        for canonical, desc, typ in _RUNTIME_PACKAGES:
            resolved = _resolve_name(canonical, pm_name) if pm_name else canonical
            status = _check_installed(resolved, check_cmd)
            table.add_row(typ, resolved, desc, status)

        # Build (nicht fuer config)
        if self._config.mode != "config":
            for canonical, desc, typ in _BUILD_PACKAGES:
                resolved = _resolve_name(canonical, pm_name) if pm_name else canonical
                status = _check_installed(resolved, check_cmd)
                table.add_row(typ, resolved, desc, status)

        # WiFi
        if self._config.mode == "server" and self._config.wifi_enabled:
            for canonical, desc, typ in _WIFI_PACKAGES:
                resolved = _resolve_name(canonical, pm_name) if pm_name else canonical
                status = _check_installed(resolved, check_cmd)
                table.add_row(typ, resolved, desc, status)