#!/usr/bin/env python3
"""
Babycam Flask Webinterface
- Live-Stream via MJPEG (rpicam-vid)
- WLAN-Verwaltung (scan, connect)
- Systemstatus
"""

import subprocess
import json
import re
import time
from flask import Flask, Response, render_template, request, jsonify

app = Flask(__name__)

STREAM_WIDTH = 1280
STREAM_HEIGHT = 720
STREAM_FPS = 20


# ---------------------------------------------------------------------------
# Kamera-Stream
# ---------------------------------------------------------------------------

def generate_frames():
    cmd = [
        "rpicam-vid",
        "-t", "0",
        "--width", str(STREAM_WIDTH),
        "--height", str(STREAM_HEIGHT),
        "--framerate", str(STREAM_FPS),
        "--codec", "mjpeg",
        "-o", "-",
        "--nopreview",
    ]
    process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)

    boundary = b"--frame\r\nContent-Type: image/jpeg\r\n\r\n"
    buf = b""

    try:
        while True:
            chunk = process.stdout.read(4096)
            if not chunk:
                break
            buf += chunk

            start = buf.find(b"\xff\xd8")
            end = buf.find(b"\xff\xd9")

            if start != -1 and end != -1 and end > start:
                frame = buf[start:end + 2]
                buf = buf[end + 2:]
                yield boundary + frame + b"\r\n"
    finally:
        process.kill()


@app.route("/stream")
def stream():
    return Response(
        generate_frames(),
        mimetype="multipart/x-mixed-replace; boundary=frame",
    )


# ---------------------------------------------------------------------------
# WLAN-Verwaltung
# ---------------------------------------------------------------------------

def get_wifi_networks():
    result = subprocess.run(
        ["nmcli", "-t", "-f", "SSID,SIGNAL,SECURITY", "device", "wifi", "list", "ifname", "wlan0"],
        capture_output=True, text=True,
    )
    networks = []
    seen = set()
    for line in result.stdout.splitlines():
        parts = line.split(":")
        if len(parts) >= 2:
            ssid = parts[0].strip()
            if ssid and ssid not in seen:
                seen.add(ssid)
                signal = parts[1] if len(parts) > 1 else "0"
                security = parts[2] if len(parts) > 2 else ""
                networks.append({"ssid": ssid, "signal": signal, "security": security})
    return sorted(networks, key=lambda x: int(x["signal"]) if x["signal"].isdigit() else 0, reverse=True)


def get_system_status():
    # IP-Adressen
    ip_result = subprocess.run(["hostname", "-I"], capture_output=True, text=True)
    ips = ip_result.stdout.strip().split()

    # Aktive WLAN-Verbindung
    wifi_result = subprocess.run(
        ["nmcli", "-t", "-f", "GENERAL.CONNECTION", "device", "show", "wlan0"],
        capture_output=True, text=True,
    )
    wifi_match = re.search(r"GENERAL\.CONNECTION:(.*)", wifi_result.stdout)
    wifi_ssid = wifi_match.group(1).strip() if wifi_match else "nicht verbunden"

    # AP-Status
    ap_result = subprocess.run(["systemctl", "is-active", "hostapd"], capture_output=True, text=True)
    ap_active = ap_result.stdout.strip() == "active"

    # Kamera verfügbar?
    cam_result = subprocess.run(["rpicam-hello", "--list-cameras"], capture_output=True, text=True)
    cam_available = "No cameras" not in cam_result.stderr and "No cameras" not in cam_result.stdout

    return {
        "ips": ips,
        "wifi_ssid": wifi_ssid,
        "ap_active": ap_active,
        "cam_available": cam_available,
        "uptime": _get_uptime(),
    }


def _get_uptime():
    try:
        with open("/proc/uptime") as f:
            seconds = float(f.read().split()[0])
        m, s = divmod(int(seconds), 60)
        h, m = divmod(m, 60)
        return f"{h}h {m}m"
    except Exception:
        return "unbekannt"


# ---------------------------------------------------------------------------
# Routen
# ---------------------------------------------------------------------------

@app.route("/")
def index():
    status = get_system_status()
    return render_template("index.html", status=status)


@app.route("/api/status")
def api_status():
    return jsonify(get_system_status())


@app.route("/wifi/scan")
def wifi_scan():
    # Kurz neu scannen
    subprocess.run(["nmcli", "device", "wifi", "rescan", "ifname", "wlan0"],
                   capture_output=True)
    time.sleep(2)
    return jsonify(get_wifi_networks())


@app.route("/wifi/connect", methods=["POST"])
def wifi_connect():
    data = request.get_json()
    ssid = data.get("ssid", "").strip()
    password = data.get("password", "").strip()

    if not ssid:
        return jsonify({"success": False, "error": "SSID fehlt"}), 400

    cmd = ["nmcli", "device", "wifi", "connect", ssid, "ifname", "wlan0"]
    if password:
        cmd += ["password", password]

    result = subprocess.run(cmd, capture_output=True, text=True, timeout=30)
    success = result.returncode == 0

    return jsonify({
        "success": success,
        "message": result.stdout.strip() or result.stderr.strip(),
    })


# ---------------------------------------------------------------------------
# Start
# ---------------------------------------------------------------------------

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=80, debug=False)