import os
import pty
import fcntl
import subprocess
import sqlite3
import asyncio
import openai
import re
from google import genai
from google.genai import types
import json
from fastapi import FastAPI, WebSocket, BackgroundTasks, Request, Form, WebSocketDisconnect
from fastapi.responses import RedirectResponse
from fastapi.templating import Jinja2Templates
from fastapi.staticfiles import StaticFiles

app = FastAPI()
static_path = os.path.join(os.path.dirname(__file__), "static")
app.mount("/static", StaticFiles(directory=static_path), name="static")
templates = Jinja2Templates(directory="templates")

SSH_KEY = os.path.expanduser("~/.ssh/id_rsa")
DB_PATH = "cluster.db"

# --- KI KONFIGURATION ---
AI_PROVIDER = "google" # "openai", "google" oder "ollama"
OPENAI_API_KEY = "dein-key"
GOOGLE_API_KEY = "dein-key"
OLLAMA_BASE_URL = "http://x.x.x.x:11434/v1" # IP deines Ollama-Servers


def get_system_prompt():
    conn = get_db()
    nodes = conn.execute('SELECT * FROM nodes').fetchall()
    conn.close()
    
    node_info = ""
    for n in nodes:
        node_info += f"- Name: {n['name']}, IP: {n['ip']}, User: {n['user']}\n"
        
    return f"""Du bist der Pi-Orchestrator KI-Assistent. Deine Aufgabe ist es, Befehle auf Raspberry Pis auszuführen. Du KANNST und SOLLST Befehle ausführen! Hier sind die aktuell verbundenen Nodes: {node_info} . WENN der Nutzer dich bittet, etwas zu tun (z.B. ping, update, docker installieren), dann formuliere erst eine kurze Antwort und füge am Ende die Befehle in genau diesem XML-Format hinzu: <EXECUTE target="IP_ADRESSE">befehl</EXECUTE> .WICHTIG: Verwende als target IMMER die IP-Adresse des Nodes. Bei Befehlen wie 'ping' oder 'top', die nicht enden, MUSS ein Limit gesetzt werden (z.B. ping -c 4 IP).Beispielantwort für 'sende einen ping an pi-06': Ich starte den Ping an pi-06 für dich. <EXECUTE target="192.168.1.10">ping -c 4 192.168.1.10</EXECUTE>"""

# --- KI FUNKTIONEN ---

async def get_ai_response(user_input, system_prompt): # <--- system_prompt hinzugefügt
    if AI_PROVIDER == "openai":
        client = openai.OpenAI(api_key=OPENAI_API_KEY)
        response = client.chat.completions.create(
            model="gpt-4o",
            messages=[{"role": "system", "content": system_prompt}, {"role": "user", "content": user_input}]
        )
        return response.choices[0].message.content

    elif AI_PROVIDER == "ollama":
        # Ollama nutzt das OpenAI-Format, braucht aber keinen Key
        client = openai.OpenAI(base_url=OLLAMA_BASE_URL, api_key="ollama", timeout=20.0)
        response = client.chat.completions.create(
            model="llama3", # Oder dein bevorzugtes Modell
            messages=[{"role": "system", "content": system_prompt}, {"role": "user", "content": user_input}]
        )
        return response.choices[0].message.content

    elif AI_PROVIDER == "google":
        # Initialisierung des neuen Clients
        client = genai.Client(api_key=GOOGLE_API_KEY)
        
        # Generierung mit dem neuen SDK
        response = client.models.generate_content(
            model='gemini-2.5-flash',
            contents=user_input,
            config=types.GenerateContentConfig(
                system_instruction=system_prompt
            )
        )
        return response.text

    return "Fehler: Kein KI-Provider konfiguriert."


# --- DATENBANK INITIALISIERUNG ---
def init_db():
    conn = sqlite3.connect(DB_PATH)
    conn.execute('''
        CREATE TABLE IF NOT EXISTS nodes (
            id INTEGER PRIMARY KEY AUTOINCREMENT, 
            name TEXT, 
            ip TEXT UNIQUE, 
            user TEXT, 
            status TEXT
        )
    ''')
    conn.commit()
    conn.close()

init_db()

def get_db():
    conn = sqlite3.connect(DB_PATH)
    conn.row_factory = sqlite3.Row
    return conn

# --- WebSocket Manager für Logs & Chat ---
class ConnectionManager:
    def __init__(self):
        self.active_connections: list[WebSocket] = []
    async def connect(self, websocket: WebSocket):
        await websocket.accept()
        self.active_connections.append(websocket)
    def disconnect(self, websocket: WebSocket):
        if websocket in self.active_connections:
            self.active_connections.remove(websocket)
    async def broadcast(self, message: str):
        for connection in self.active_connections:
            try:
                await connection.send_text(message)
            except:
                pass

manager = ConnectionManager()

# --- SSH Handshake (Nur Key kopieren) ---
async def bootstrap_ssh_only(ip, user, password):
    await manager.broadcast(f"🔑 Initialisiere SSH-Handshake für {ip}...")
    # Nutzt sshpass um den Key einmalig mit Passwort zu hinterlegen
    ssh_copy_cmd = f"sshpass -p '{password}' ssh-copy-id -o StrictHostKeyChecking=no -i {SSH_KEY}.pub {user}@{ip}"
    
    process = subprocess.Popen(ssh_copy_cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True)
    for line in process.stdout:
        await manager.broadcast(f"SSH: {line.strip()}")
    
    conn = get_db()
    conn.execute('UPDATE nodes SET status = "Bereit (Kein Docker)" WHERE ip = ?', (ip,))
    conn.commit()
    conn.close()
    await manager.broadcast(f"✅ Node {ip} ist verbunden. KI kann nun Befehle senden.")

# --- Routen ---

@app.get("/")
async def index(request: Request):
    conn = get_db()
    nodes = conn.execute('SELECT * FROM nodes').fetchall()
    conn.close()
    return templates.TemplateResponse("index.html", {"request": request, "nodes": nodes})

@app.post("/add_node")
async def add_node(background_tasks: BackgroundTasks, name: str = Form(...), ip: str = Form(...), user: str = Form(...), password: str = Form(...)):
    conn = get_db()
    try:
        conn.execute('INSERT INTO nodes (name, ip, user, status) VALUES (?, ?, ?, ?)', (name, ip, user, "Kopplung..."))
        conn.commit()
        background_tasks.add_task(bootstrap_ssh_only, ip, user, password)
    except sqlite3.IntegrityError: pass
    finally: conn.close()
    return RedirectResponse(url="/", status_code=303)

@app.post("/remove_node/{node_id}")
async def remove_node(node_id: int):
    conn = get_db()
    conn.execute('DELETE FROM nodes WHERE id = ?', (node_id,))
    conn.commit()
    conn.close()
    return RedirectResponse(url="/", status_code=303)

# --- WebSockets ---

@app.websocket("/ws/install_logs")
async def log_websocket(websocket: WebSocket):
    await manager.connect(websocket)
    try:
        while True:
            await websocket.receive_text()
    except WebSocketDisconnect:
        manager.disconnect(websocket)

@app.websocket("/ws/terminal/{ip}")
async def terminal_websocket(websocket: WebSocket, ip: str):
    await websocket.accept()
    conn = get_db()
    node = conn.execute('SELECT * FROM nodes WHERE ip = ?', (ip,)).fetchone()
    conn.close()

    if not node:
        await websocket.send_text("\r\nFehler: Node nicht gefunden.\r\n")
        await websocket.close()
        return

    # Pseudo-Terminal für interaktive SSH-Session
    master_fd, slave_fd = pty.openpty()
    proc = await asyncio.create_subprocess_exec(
        "ssh", "-o", "StrictHostKeyChecking=no", "-t", f"{node['user']}@{ip}",
        stdin=slave_fd, stdout=slave_fd, stderr=slave_fd
    )

    async def pty_to_ws():
        # Setzt den Master-FD auf non-blocking
        fl = fcntl.fcntl(master_fd, fcntl.F_GETFL)
        fcntl.fcntl(master_fd, fcntl.F_SETFL, fl | os.O_NONBLOCK)
        try:
            while True:
                await asyncio.sleep(0.01)
                try:
                    data = os.read(master_fd, 1024).decode(errors='ignore')
                    if data:
                        await websocket.send_text(data)
                except BlockingIOError:
                    continue
        except Exception: pass

    async def ws_to_pty():
        try:
            while True:
                data = await websocket.receive_text()
                os.write(master_fd, data.encode())
        except Exception: pass

    try:
        await asyncio.gather(pty_to_ws(), ws_to_pty())
    finally:
        if proc.returncode is None: proc.terminate()
        os.close(master_fd)
        os.close(slave_fd)

# --- WEBSOCKET CHAT UPDATE ---

@app.websocket("/ws/chat")
async def chat_endpoint(websocket: WebSocket):
    await websocket.accept()
    try:
        while True:
            user_msg = await websocket.receive_text()
            
            # 1. Dynamischen Prompt laden
            sys_prompt = get_system_prompt()
            
            # 2. KI fragen
            ai_response = await get_ai_response(user_msg, sys_prompt)
            
            # 3. XML-Tags auslesen (<EXECUTE target="IP">Befehl</EXECUTE>)
            commands_to_run = re.findall(r'<EXECUTE target="(.*?)">(.*?)</EXECUTE>', ai_response, re.IGNORECASE | re.DOTALL)
            
            # 4. XML-Tags für das UI ausblenden, damit der Chat sauber aussieht
            clean_chat_msg = re.sub(r'<EXECUTE.*?>.*?</EXECUTE>', '', ai_response, flags=re.IGNORECASE | re.DOTALL).strip()
            
            if clean_chat_msg:
                await websocket.send_text(clean_chat_msg)
            
            # 5. Gefundene Befehle an den Pi schicken!
            for target_ip, cmd in commands_to_run:
                target_ip = target_ip.strip()
                cmd = cmd.strip()
                
                conn = get_db()
                node = conn.execute('SELECT * FROM nodes WHERE ip = ? OR name = ?', (target_ip, target_ip)).fetchone()
                conn.close()
                
                if node:
                    # Leite Aufgabe an die System Logs weiter
                    asyncio.create_task(run_remote_task(node['ip'], node['user'], cmd, "KI-Kommando"))
                else:
                    await websocket.send_text(f"⚠️ Konnte Node {target_ip} in DB nicht finden.")

    except Exception as e:
        print(f"Chat Fehler: {e}")

async def run_remote_task(ip, user, cmd, task_name):
    await manager.broadcast(f"🚀 KI-Task gestartet: {cmd} auf {ip}")
    
    ssh_cmd = f"ssh -o StrictHostKeyChecking=no {user}@{ip} '{cmd}'"
    
    # Asynchroner Subprozess, damit das restliche Dashboard nicht einfriert
    process = await asyncio.create_subprocess_shell(
        ssh_cmd,
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.STDOUT
    )
    
    # Lese die Logs Zeile für Zeile, während sie entstehen
    while True:
        line = await process.stdout.readline()
        if not line:
            break
        decoded_line = line.decode('utf-8', errors='ignore').strip()
        if decoded_line:
            await manager.broadcast(f"🛠️ {decoded_line}")
            
    await process.wait()
    
    # Falls es ein Docker-Befehl war, Status updaten
    if "docker" in cmd.lower():
        update_node_status(ip, "Docker Aktiv")
        await manager.broadcast(f"✨ {ip} ist nun 'Docker Aktiv'")
        
    await manager.broadcast(f"✅ Befehl auf {ip} abgeschlossen.")
    
# --- Neuer Endpunkt: Manueller Refresh-Check ---
@app.get("/refresh_status/{node_id}")
async def refresh_status(node_id: int):
    conn = get_db()
    node = conn.execute('SELECT * FROM nodes WHERE id = ?', (node_id,)).fetchone()
    
    if node:
        # Kurzer Check via SSH, ob Docker antwortet
        check_cmd = "command -v docker >/dev/null 2>&1 && echo 'Docker Aktiv' || echo 'Bereit (Kein Docker)'"
        ssh_cmd = f"ssh -o StrictHostKeyChecking=no -o ConnectTimeout=2 {node['user']}@{node['ip']} \"{check_cmd}\""
        try:
            # Wir führen den Befehl aus
            new_status = subprocess.check_output(ssh_cmd, shell=True).decode().strip()
        except Exception:
            new_status = "Offline/Fehler"
            
        conn.execute('UPDATE nodes SET status = ? WHERE id = ?', (new_status, node_id))
        conn.commit()
        conn.close()
        return {"status": new_status} # Wir senden nur den Status zurück
    
    conn.close()
    return {"status": "Unbekannt"}

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=8000)