"""Network profile control surface; backend access is restricted to a forced SSH command."""
from __future__ import annotations
import json, os, secrets, sqlite3, subprocess, time
from datetime import datetime
from zoneinfo import ZoneInfo
from flask import Flask, flash, jsonify, redirect, render_template, request, session, url_for

BASE_DIR = os.path.dirname(os.path.abspath(__file__))
AUDIT_DB = os.path.join(BASE_DIR, "control-history.db")
TZ = ZoneInfo("Europe/Berlin")
app = Flask(__name__)
app.secret_key = os.environ["SESSION_SECRET"]
app.config.update(SESSION_COOKIE_HTTPONLY=True, SESSION_COOKIE_SAMESITE="Strict", SESSION_COOKIE_SECURE=True)

PROFILES = {
    "strict": {"label": "Strikt", "ch": 0.5, "vpn": 0.5, "color": "#ff667d"},
    "standard": {"label": "Standard", "ch": 1.0, "vpn": 1.0, "color": "#a88dff"},
    "relaxed": {"label": "Entspannt", "ch": 5.0, "vpn": 5.0, "color": "#32d6a3"},
    "open": {"label": "Off-Peak", "ch": 10.0, "vpn": 10.0, "color": "#26c6da"},
}
_CACHE = {"at": 0.0, "data": None}

def init_audit():
    with sqlite3.connect(AUDIT_DB) as db:
        db.execute("CREATE TABLE IF NOT EXISTS audit(id INTEGER PRIMARY KEY AUTOINCREMENT,ts INTEGER NOT NULL,action TEXT NOT NULL,detail TEXT,ok INTEGER NOT NULL,error TEXT,remote_ip TEXT)")
        db.execute("CREATE INDEX IF NOT EXISTS idx_audit_ts ON audit(ts DESC)")

def audit(action, detail, result):
    try:
        remote = (request.headers.get("X-Forwarded-For") or request.remote_addr or "").split(",")[0].strip()
        with sqlite3.connect(AUDIT_DB) as db:
            db.execute("INSERT INTO audit(ts,action,detail,ok,error,remote_ip) VALUES(?,?,?,?,?,?)", (int(time.time()), action, detail[:500], 1 if result.get("ok") else 0, str(result.get("error", ""))[:500], remote[:80]))
            db.execute("DELETE FROM audit WHERE id NOT IN (SELECT id FROM audit ORDER BY id DESC LIMIT 2000)")
    except Exception:
        app.logger.exception("audit write failed")

init_audit()

def rpc(command: str, timeout: int = 25):
    try:
        p = subprocess.run(["ssh", "-o", "BatchMode=yes", "-o", "ConnectTimeout=8", "edge-maint", command], capture_output=True, text=True, timeout=timeout)
        raw = p.stdout.strip()
        try:
            data = json.loads(raw) if raw else {}
        except json.JSONDecodeError:
            data = {"ok": False, "error": (p.stderr or raw or "invalid response")[:300]}
        if p.returncode and data.get("ok") is not False:
            data = {"ok": False, "error": (p.stderr or raw or f"rpc exit {p.returncode}")[:300]}
        return data
    except Exception as exc:
        return {"ok": False, "error": str(exc)[:300]}

def get_state(force=False):
    now = time.monotonic()
    if not force and _CACHE["data"] is not None and now - _CACHE["at"] < 3:
        return _CACHE["data"]
    data = rpc("state")
    data.setdefault("limits", {}); data.setdefault("tc", {}); data.setdefault("services", {}); data.setdefault("policy", {}); data.setdefault("ipsets", {})
    _CACHE.update(at=now, data=data)
    return data

def csrf_token():
    token = session.get("csrf")
    if not token:
        token = session["csrf"] = secrets.token_urlsafe(32)
    return token

app.jinja_env.globals["csrf_token"] = csrf_token

@app.template_filter("dt")
def fmt_datetime(value):
    try: return datetime.fromtimestamp(int(value), TZ).strftime("%d.%m.%Y %H:%M:%S")
    except (TypeError, ValueError, OSError): return "—"

@app.template_filter("bytes")
def fmt_bytes(value):
    try: number = float(value or 0)
    except (TypeError, ValueError): return "—"
    for unit in ("B", "KiB", "MiB", "GiB", "TiB"):
        if number < 1024 or unit == "TiB": return f"{number:.1f} {unit}"
        number /= 1024

@app.template_filter("duration")
def fmt_duration(value):
    try: seconds = max(0, int(value))
    except (TypeError, ValueError): return "—"
    days, seconds = divmod(seconds, 86400); hours, seconds = divmod(seconds, 3600); minutes, _ = divmod(seconds, 60)
    return (f"{days}d {hours}h" if days else f"{hours}h {minutes}m" if hours else f"{minutes}m")

@app.before_request
def protect_post():
    if request.method == "POST" and not secrets.compare_digest(request.form.get("csrf", ""), session.get("csrf", "invalid")):
        return "invalid request token", 400

@app.get("/")
def dashboard():
    return render_template("dashboard.html", state=get_state(), profiles=PROFILES, page="dashboard")

@app.get("/history")
def history_page():
    remote = rpc("history", timeout=35)
    with sqlite3.connect(AUDIT_DB) as db:
        db.row_factory = sqlite3.Row
        local_audit = [dict(row) for row in db.execute("SELECT ts,action,detail,ok,error,remote_ip FROM audit ORDER BY id DESC LIMIT 250")]
    history = remote.get("history", {}) if remote.get("ok") else {}
    for name in ("sessions", "ips", "events", "blocks"): history.setdefault(name, [])
    return render_template("history.html", state=get_state(), history=history, audit=local_audit, history_error=remote.get("error"), page="history")

@app.post("/profile/<name>")
def apply_profile(name):
    profile = PROFILES.get(name)
    if not profile:
        flash("Unbekanntes Profil", "error"); return redirect(url_for("dashboard"))
    result = rpc(f"set-limits {profile['ch']} {profile['vpn']}")
    audit("profile", f"{profile['label']}: Region {profile['ch']} / Cloud {profile['vpn']} Mbit", result)
    _CACHE["data"] = None
    flash(f"Profil {profile['label']} aktiviert" if result.get("ok") else f"Fehler: {result.get('error','unbekannt')}", "success" if result.get("ok") else "error")
    return redirect(url_for("dashboard"))

@app.post("/limits")
def custom_limits():
    try:
        ch = float(request.form["ch"]); vpn = float(request.form["vpn"])
        if not 0.1 <= ch <= 100 or not 0.1 <= vpn <= 100: raise ValueError
    except (KeyError, ValueError):
        flash("Limits müssen zwischen 0,1 und 100 Mbit liegen", "error"); return redirect(url_for("dashboard"))
    result = rpc(f"set-limits {ch:g} {vpn:g}")
    audit("limits", f"Region {ch:g} / Cloud {vpn:g} Mbit", result)
    _CACHE["data"] = None
    flash("Benutzerdefinierte Limits gesetzt" if result.get("ok") else f"Fehler: {result.get('error','unbekannt')}", "success" if result.get("ok") else "error")
    return redirect(url_for("dashboard"))

@app.post("/policy")
def policy():
    mode = request.form.get("mode", "")
    try:
        min_sessions = int(request.form.get("min_sessions", "2")); block_minutes = int(request.form.get("block_minutes", "10"))
        if mode not in {"off", "monitor", "block"} or not 2 <= min_sessions <= 8 or not 1 <= block_minutes <= 1440: raise ValueError
    except ValueError:
        flash("Ungültige Policy-Werte", "error"); return redirect(url_for("dashboard"))
    result = rpc(f"set-policy {mode} {min_sessions} {block_minutes}")
    audit("policy", f"Modus {mode}, ab {min_sessions} Streams, {block_minutes} Minuten", result)
    _CACHE["data"] = None
    flash("Session-Policy aktualisiert" if result.get("ok") else f"Fehler: {result.get('error','unbekannt')}", "success" if result.get("ok") else "error")
    return redirect(url_for("dashboard"))

@app.post("/maintenance/<action>")
def maintenance(action):
    mapping = {"refresh": "limiter refresh", "start": "limiter start", "stop": "limiter stop", "worker": "restart worker", "admin": "restart admin"}
    command = mapping.get(action)
    if not command: return "unknown action", 404
    result = rpc(command)
    audit("maintenance", action, result)
    _CACHE["data"] = None
    flash(f"Aktion {action} gestartet" if result.get("ok") else f"Fehler: {result.get('error','unbekannt')}", "success" if result.get("ok") else "error")
    return redirect(url_for("dashboard"))

@app.get("/api/status")
def api_status(): return jsonify(get_state())

@app.get("/health")
def health():
    state = get_state()
    return jsonify({"ok": bool(state.get("ok")), "backend": "reachable" if state else "unreachable"}), 200 if state.get("ok") else 503