# lead-engine/trading_twins/manager.py
from email.mime.text import MIMEText
import base64
import requests
import json
import os
import time
from datetime import datetime, timedelta
from zoneinfo import ZoneInfo
from threading import Thread, Lock
import uvicorn
from fastapi import FastAPI, Response, BackgroundTasks
from sqlalchemy.orm import sessionmaker
import msal
from .models import init_db, ProposalJob, ProposedSlot

# --- Setup ---
TZ_BERLIN = ZoneInfo("Europe/Berlin")
DB_FILE_PATH = os.path.join(os.path.dirname(os.path.dirname(__file__)), "data", "trading_twins.db")
if not os.path.exists(os.path.dirname(DB_FILE_PATH)):
    os.makedirs(os.path.dirname(DB_FILE_PATH))
SessionLocal = init_db(f"sqlite:///{DB_FILE_PATH}")

# --- Config ---
TEAMS_WEBHOOK_URL = os.getenv("TEAMS_WEBHOOK_URL", "")
FEEDBACK_SERVER_BASE_URL = os.getenv("FEEDBACK_SERVER_BASE_URL", "http://localhost:8004")
DEFAULT_WAIT_MINUTES = 5
SENDER_EMAIL = os.getenv("SENDER_EMAIL", "info@robo-planet.de")
TEST_RECEIVER_EMAIL = "floke.com@gmail.com"
SIGNATURE_FILE_PATH = os.path.join(os.path.dirname(__file__), "signature.html")

# Credentials
AZURE_CLIENT_ID = os.getenv("INFO_Application_ID")
AZURE_CLIENT_SECRET = os.getenv("INFO_Secret")
AZURE_TENANT_ID = os.getenv("INFO_Tenant_ID")
CAL_APPID = os.getenv("CAL_APPID")
CAL_SECRET = os.getenv("CAL_SECRET")
CAL_TENNANT_ID = os.getenv("CAL_TENNANT_ID")
GRAPH_API_ENDPOINT = "https://graph.microsoft.com/v1.0"

# --- Auth & Calendar Logic (unchanged, proven) ---
def get_access_token(client_id, client_secret, tenant_id):
    if not all([client_id, client_secret, tenant_id]): return None
    authority = f"https://login.microsoftonline.com/{tenant_id}"
    app = msal.ConfidentialClientApplication(client_id=client_id, authority=authority, client_credential=client_secret)
    result = app.acquire_token_silent([".default"], account=None) or app.acquire_token_for_client(scopes=[".default"])
    return result.get('access_token')

def get_availability(target_email, app_creds):
    print(f"DEBUG: Requesting availability for {target_email}")
    token = get_access_token(*app_creds)
    if not token:
        print("DEBUG: Failed to acquire access token.")
        return None
    
    headers = {"Authorization": f"Bearer {token}", "Content-Type": "application/json", "Prefer": 'outlook.timezone="Europe/Berlin"'}
    start_time = datetime.now(TZ_BERLIN).replace(hour=0, minute=0, second=0, microsecond=0)
    end_time = start_time + timedelta(days=3)
    # Use 15-minute intervals for finer granularity
    payload = {"schedules": [target_email], "startTime": {"dateTime": start_time.isoformat()}, "endTime": {"dateTime": end_time.isoformat()}, "availabilityViewInterval": 15}
    
    try:
        url = f"{GRAPH_API_ENDPOINT}/users/{target_email}/calendar/getSchedule"
        r = requests.post(url, headers=headers, json=payload)
        print(f"DEBUG: API Status Code: {r.status_code}")
        
        if r.status_code == 200:
            view = r.json()['value'][0].get('availabilityView', '')
            print(f"DEBUG: Availability View received (Length: {len(view)})")
            return start_time, view, 15
        else:
            print(f"DEBUG: API Error Response: {r.text}")
    except Exception as e:
        print(f"DEBUG: Exception during API call: {e}")
        pass
    return None

def find_slots(start, view, interval):
    """
    Parses availability string: '0'=Free, '2'=Busy.
    Returns 2 free slots (start times) within business hours (09:00 - 16:30),
    excluding weekends (Sat/Sun), with approx. 3 hours distance between them.
    """
    slots = []
    first_slot = None
    
    # Iterate through the view string
    for i, status in enumerate(view):
        if status == '0':  # '0' means Free
            slot_time = start + timedelta(minutes=i * interval)
            
            # Constraints:
            # 1. Mon-Fri only
            # 2. Business hours (09:00 - 16:30)
            # 3. Future only
            if slot_time.weekday() < 5 and (9 <= slot_time.hour < 17) and slot_time > datetime.now(TZ_BERLIN):
                # Max start time 16:30
                if slot_time.hour == 16 and slot_time.minute > 30:
                    continue
                
                if first_slot is None:
                    first_slot = slot_time
                    slots.append(first_slot)
                else:
                    # Second slot should be at least 3 hours after the first
                    if slot_time >= first_slot + timedelta(hours=3):
                        slots.append(slot_time)
                        break
    return slots

def create_calendar_invite(lead_email, company, start_time):
    catchall = os.getenv("EMAIL_CATCHALL"); lead_email = catchall if catchall else lead_email
    token = get_access_token(AZURE_CLIENT_ID, AZURE_CLIENT_SECRET, AZURE_TENANT_ID)
    if not token: return False
    headers = {"Authorization": f"Bearer {token}", "Content-Type": "application/json"}
    end_time = start_time + timedelta(minutes=15)
    payload = {
        "subject": f"Kennenlerngespräch RoboPlanet <> {company}",
        "body": {"contentType": "HTML", "content": "Vielen Dank für die Terminbuchung."},
        "start": {"dateTime": start_time.isoformat(), "timeZone": "Europe/Berlin"},
        "end": {"dateTime": end_time.isoformat(), "timeZone": "Europe/Berlin"},
        "attendees": [{"emailAddress": {"address": lead_email}}, {"emailAddress": {"address": "e.melcer@robo-planet.de"}}],
        "isOnlineMeeting": True, "onlineMeetingProvider": "teamsForBusiness"
    }
    r = requests.post(f"{GRAPH_API_ENDPOINT}/users/{SENDER_EMAIL}/calendar/events", headers=headers, json=payload)
    return r.status_code in [200, 201]

# --- FastAPI Server ---
app = FastAPI()

@app.get("/test_lead", status_code=202)
def trigger_test_lead(background_tasks: BackgroundTasks):
    req_id = f"test_{int(time.time())}"
    background_tasks.add_task(process_lead, req_id, "Testfirma GmbH", "Wir haben Ihre Anfrage erhalten.", TEST_RECEIVER_EMAIL, "Max Mustermann")
    return {"status": "Test lead triggered", "id": req_id}

@app.get("/stop/{job_uuid}")
def stop(job_uuid: str):
    db = SessionLocal(); job = db.query(ProposalJob).filter(ProposalJob.job_uuid == job_uuid).first()
    if job: job.status = "cancelled"; db.commit(); db.close(); return Response("Gestoppt.")
    db.close(); return Response("Not Found", 404)

@app.get("/send_now/{job_uuid}")
def send_now(job_uuid: str):
    db = SessionLocal(); job = db.query(ProposalJob).filter(ProposalJob.job_uuid == job_uuid).first()
    if job: job.status = "send_now"; db.commit(); db.close(); return Response("Wird gesendet.")
    db.close(); return Response("Not Found", 404)

@app.get("/book_slot/{job_uuid}/{ts}")
def book_slot(job_uuid: str, ts: int):
    slot_time = datetime.fromtimestamp(ts, tz=TZ_BERLIN)
    db = SessionLocal(); job = db.query(ProposalJob).filter(ProposalJob.job_uuid == job_uuid).first()
    if not job or job.status == "booked": db.close(); return Response("Fehler.", 400)
    if create_calendar_invite(job.customer_email, job.customer_company, slot_time):
        job.status = "booked"; db.commit(); db.close(); return Response(f"Gebucht!")
    db.close(); return Response("Fehler bei Kalender.", 500)

# --- Workflow Logic ---
def send_email(subject, body, to_email, signature):
    catchall = os.getenv("EMAIL_CATCHALL"); to_email = catchall if catchall else to_email
    token = get_access_token(AZURE_CLIENT_ID, AZURE_CLIENT_SECRET, AZURE_TENANT_ID)
    if not token: return
    headers = {"Authorization": f"Bearer {token}", "Content-Type": "application/json"}
    payload = {"message": {"subject": subject, "body": {"contentType": "HTML", "content": body + signature}, "toRecipients": [{"emailAddress": {"address": to_email}}]}, "saveToSentItems": "true"}
    requests.post(f"{GRAPH_API_ENDPOINT}/users/{SENDER_EMAIL}/sendMail", headers=headers, json=payload)

def process_lead(request_id, company, opener, receiver, name):
    db = SessionLocal()
    job = ProposalJob(job_uuid=request_id, customer_email=receiver, customer_company=company, customer_name=name, status="pending")
    db.add(job); db.commit()
    
    cal_data = get_availability("e.melcer@robo-planet.de", (CAL_APPID, CAL_SECRET, CAL_TENNANT_ID))
    suggestions = find_slots(*cal_data) if cal_data else []
    
    # --- FALLBACK LOGIC ---
    if not suggestions:
        print("WARNING: No slots found via API. Creating fallback slots.")
        now = datetime.now(TZ_BERLIN)
        # Tomorrow 10:00
        tomorrow = (now + timedelta(days=1)).replace(hour=10, minute=0, second=0, microsecond=0)
        # Day after tomorrow 14:00
        overmorrow = (now + timedelta(days=2)).replace(hour=14, minute=0, second=0, microsecond=0)
        suggestions = [tomorrow, overmorrow]
    # --------------------

    for s in suggestions: db.add(ProposedSlot(job_id=job.id, start_time=s, end_time=s+timedelta(minutes=15)))
    db.commit()

    card = {"type": "message", "attachments": [{"contentType": "application/vnd.microsoft.card.adaptive", "content": {"type": "AdaptiveCard", "version": "1.4", "body": [{"type": "TextBlock", "text": f"🤖 E-Mail an {company}?"}], "actions": [{"type": "Action.OpenUrl", "title": "STOP", "url": f"{FEEDBACK_SERVER_BASE_URL}/stop/{request_id}"},{"type": "Action.OpenUrl", "title": "JETZT", "url": f"{FEEDBACK_SERVER_BASE_URL}/send_now/{request_id}"}]}}]}
    requests.post(TEAMS_WEBHOOK_URL, json=card)
    
    send_time = datetime.now(TZ_BERLIN) + timedelta(minutes=DEFAULT_WAIT_MINUTES)
    while datetime.now(TZ_BERLIN) < send_time:
        db.refresh(job)
        if job.status in ["cancelled", "send_now"]: break
        time.sleep(5)
    
    if job.status == "cancelled": db.close(); return
    
    booking_html = "<ul>"
    for s in suggestions: booking_html += f'<li><a href="{FEEDBACK_SERVER_BASE_URL}/book_slot/{request_id}/{int(s.timestamp())}">{s.strftime("%d.%m %H:%M")}</a></li>'
    booking_html += "</ul>"
    
    try:
        with open(SIGNATURE_FILE_PATH, 'r') as f: sig = f.read()
    except: sig = ""

    # THIS IS THE CORRECTED EMAIL BODY
    email_body = f"""
    <p>Hallo {name},</p>
    <p>{opener}</p>
    <p>Hätten Sie an einem dieser Termine Zeit für ein kurzes Gespräch?</p>
    {booking_html}
    """
    
    send_email(f"Ihr Kontakt mit RoboPlanet - {company}", email_body, receiver, sig)
    job.status = "sent"; db.commit(); db.close()

if __name__ == "__main__":
    uvicorn.run(app, host="0.0.0.0", port=8004)