import time
import smtplib
import yaml
import requests
import csv
import qrcode
import io
from email.message import EmailMessage
from flask import Flask, request, jsonify, abort
from jinja2 import Template
from functools import wraps
from datetime import datetime

app = Flask(__name__)

with open("config.yaml", "r") as f:
    config = yaml.safe_load(f)

MAIL_CONFIG = config["mails"]
MEALS = config["meals"]
TYPES = config["types"]
PRETIX = config["pretix"]
AUTH_TOKEN = config.get("auth", {}).get("token")


with open("template.txt", "r") as f:
    MAIL_TEMPLATE = Template(f.read())


def require_auth(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        token = request.headers.get("Authorization")
        if not token or token != f"Bearer {AUTH_TOKEN}":
            abort(401, description="Unauthorized: Invalid or missing token")
        return f(*args, **kwargs)
    return decorated

def send_email(to_email, subject, body, attachment_bytes, filename):
    print(f"[DEBUG] Sending email to {to_email} with attachment {filename}")
    msg = EmailMessage()
    msg["From"] = MAIL_CONFIG["sender"]
    msg["To"] = to_email
    msg["Subject"] = subject
    msg.set_content(body)
    msg.add_attachment(attachment_bytes, maintype="application", subtype="pdf", filename=filename)

    server = smtplib.SMTP(MAIL_CONFIG["server"], MAIL_CONFIG["port"])
    if MAIL_CONFIG.get("starttls"):
        server.starttls()
    server.login(MAIL_CONFIG["user"], MAIL_CONFIG["password"])
    server.send_message(msg)
    server.quit()
    print("[DEBUG] Email sent successfully")

def get_meal_times(meal_key):
    if meal_key.endswith("mittag"):
        return "11:30 - 13:30"
    elif meal_key.endswith("abend"):
        return "17:30 - 19:30"
    return ""

def log_printed(email, meal_key):
    location = email.split("@")[0]
    now = datetime.now()
    date_str = now.strftime("%Y-%m-%d")
    time_str = now.strftime("%H:%M:%S")
    with open("printed.csv", "a", newline="") as csvfile:
        writer = csv.writer(csvfile, delimiter=";")
        writer.writerow([date_str, time_str, meal_key, location])
    print(f"[DEBUG] Logged printed PDF: {location} - {meal_key}")

def generate_qr(secret):
    qr = qrcode.QRCode(box_size=10, border=4)
    qr.add_data(secret)
    qr.make(fit=True)
    img = qr.make_image(fill_color="black", back_color="white")
    buf = io.BytesIO()
    img.save(buf, format="PNG")
    buf.seek(0)
    return buf.getvalue()

@app.route("/order", methods=["POST"])
@require_auth
def order():
    data = request.get_json()
    print(f"[DEBUG] Incoming request JSON: {data}")

    email = data.get("email")
    typ = data.get("type")
    meal_key = data.get("meal")

    if not email or not typ or not meal_key:
        return jsonify({"error": "Missing field"}), 400

    meal_info = MEALS.get(meal_key)
    if not meal_info:
        return jsonify({"error": "Meal not found in config"}), 400

    position = {
        "positionid": 1,
        "item": TYPES.get(typ),
        "variation": None,
        "price": "0",
        "attendee_email": None,
        "addon_to": None,
        "subevent": meal_info["subevent"]
    }

    pretix_body = {
        "email": "pretixfood@td00.de",
        "locale": "en",
        "sales_channel": "web",
        "payment_provider": "manual",
        "positions": [position]
    }

    url = f"{PRETIX['host']}/api/v1/organizers/{PRETIX['organizer']}/events/{PRETIX['event']}/orders/"
    headers = {"Authorization": f"Token {PRETIX['token']}"}

    print(f"[DEBUG] Sending POST to Pretix: {url} with body {pretix_body}")
    resp = requests.post(url, json=pretix_body, headers=headers)
    print(f"[DEBUG] Pretix response status: {resp.status_code}")
    print(f"[DEBUG] Pretix response text: {resp.text}")

    try:
        resp_json = resp.json()
        print(f"[DEBUG] Pretix response JSON: {resp_json}")
    except ValueError:
        print("[DEBUG] Pretix returned no JSON")
        return jsonify({"error": "Pretix returned no JSON", "status_code": resp.status_code, "text": resp.text}), 502

    if "positions" in resp_json and "item" in resp_json["positions"][0] and isinstance(resp_json["positions"][0]["item"], list):
        if isinstance(resp_json["positions"][0]["item"][0], str):
            print("[DEBUG] Not enough quota available")
            return "Essen ist bereits alle", 418

    try:
        secret = resp_json["positions"][0]["secret"]
        print(f"[DEBUG] Secret: {secret}")
    except (KeyError, IndexError):
        return jsonify({"error": "Secret not found in Pretix response", "resp_json": resp_json}), 500

    meal_times = get_meal_times(meal_key)

    mail_body = MAIL_TEMPLATE.render(
        meal_name=meal_info["name"],
        meal_name_en=meal_info["name_en"],
        meal_date=meal_info["date"],
        meal_times=meal_times
    )

    if email.endswith("@printme.local"):
        log_printed(email, meal_key)
        return secret, 200, {"Content-Type": "text/plain; charset=utf-8"}

    qr_bytes = generate_qr(secret)
    send_email(email, "Dein Engelessen / Your Angel Meal", mail_body, qr_bytes, "ticket.png")

    return "Token gesendet", 201

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