from flask import Flask, render_template, request, jsonify, session, redirect, url_for, flash
import mysql.connector
import os
import re
import requests
import random
import string
from datetime import datetime
from functools import wraps

app = Flask(__name__)
app.secret_key = os.environ.get('SECRET_KEY', 'skyevouchers-secret-key-2024')

# Config
DB_CONFIG = {
    'host': os.environ.get('DB_HOST', 'localhost'),
    'port': int(os.environ.get('DB_PORT', 3306)),
    'user': os.environ.get('DB_USER', 'root'),
    'password': os.environ.get('DB_PASSWORD', ''),
    'database': os.environ.get('DB_NAME', 'skyevouchers'),
}
ADMIN_PASSWORD = os.environ.get('ADMIN_PASSWORD', 'admin123')
GOTIFY_URL = os.environ.get('GOTIFY_URL', 'http://localhost:8080')
GOTIFY_TOKEN = os.environ.get('GOTIFY_TOKEN', '')
LOW_VOUCHER_THRESHOLD = 2


def get_db():
    return mysql.connector.connect(**DB_CONFIG)


def init_db():
    conn = get_db()
    c = conn.cursor()
    c.execute('''CREATE TABLE IF NOT EXISTS vouchers (
        id INT AUTO_INCREMENT PRIMARY KEY,
        code VARCHAR(20) NOT NULL UNIQUE,
        used BOOLEAN DEFAULT FALSE,
        used_at DATETIME NULL,
        created_at DATETIME DEFAULT CURRENT_TIMESTAMP
    )''')
    conn.commit()
    conn.close()


def send_gotify_notification(remaining):
    if not GOTIFY_TOKEN:
        return
    try:
        requests.post(
            f"{GOTIFY_URL}/message",
            json={
                "title": "⚠️ Skye Vouchers – Niedriger Bestand",
                "message": f"Nur noch {remaining} Voucher(s) verfügbar! Bitte neue Vouchers hinzufügen.",
                "priority": 8
            },
            params={"token": GOTIFY_TOKEN},
            timeout=5
        )
    except Exception:
        pass


def login_required(f):
    @wraps(f)
    def decorated(*args, **kwargs):
        if not session.get('admin_logged_in'):
            return redirect(url_for('admin_login'))
        return f(*args, **kwargs)
    return decorated


# ── Frontend ──────────────────────────────────────────────────────────────────

@app.route('/')
def index():
    return render_template('index.html')


@app.route('/api/get-voucher', methods=['POST'])
def get_voucher():
    conn = get_db()
    c = conn.cursor(dictionary=True)
    c.execute('SELECT id, code FROM vouchers WHERE used = FALSE ORDER BY RAND() LIMIT 1')
    voucher = c.fetchone()
    if not voucher:
        conn.close()
        return jsonify({'error': 'Keine Vouchers mehr verfügbar'}), 404

    c.execute('UPDATE vouchers SET used = TRUE, used_at = %s WHERE id = %s',
              (datetime.now(), voucher['id']))
    conn.commit()

    # Check remaining
    c.execute('SELECT COUNT(*) AS cnt FROM vouchers WHERE used = FALSE')
    remaining = c.fetchone()['cnt']
    conn.close()

    if remaining <= LOW_VOUCHER_THRESHOLD:
        send_gotify_notification(remaining)

    return jsonify({'code': voucher['code']})


# ── Admin ─────────────────────────────────────────────────────────────────────

@app.route('/admin/login', methods=['GET', 'POST'])
def admin_login():
    if request.method == 'POST':
        if request.form.get('password') == ADMIN_PASSWORD:
            session['admin_logged_in'] = True
            return redirect(url_for('admin_dashboard'))
        flash('Falsches Passwort', 'error')
    return render_template('admin_login.html')


@app.route('/admin/logout')
def admin_logout():
    session.clear()
    return redirect(url_for('admin_login'))


@app.route('/admin')
@login_required
def admin_dashboard():
    conn = get_db()
    c = conn.cursor(dictionary=True)
    c.execute('SELECT COUNT(*) AS cnt FROM vouchers WHERE used = FALSE')
    available = c.fetchone()['cnt']
    c.execute('SELECT COUNT(*) AS cnt FROM vouchers WHERE used = TRUE')
    used_count = c.fetchone()['cnt']
    c.execute('SELECT COUNT(*) AS cnt FROM vouchers')
    total = c.fetchone()['cnt']
    c.execute('SELECT code, used_at FROM vouchers WHERE used = TRUE ORDER BY used_at DESC LIMIT 20')
    recent_used = c.fetchall()
    c.execute('SELECT code, created_at FROM vouchers WHERE used = FALSE ORDER BY created_at DESC LIMIT 20')
    available_vouchers = c.fetchall()
    conn.close()
    return render_template('admin_dashboard.html',
                           available=available,
                           used_count=used_count,
                           total=total,
                           recent_used=recent_used,
                           available_vouchers=available_vouchers)


@app.route('/admin/import', methods=['POST'])
@login_required
def admin_import():
    text = request.form.get('voucher_text', '')
    # Extract codes matching xxxxx-xxxxx (5 digits, dash, 5 digits)
    codes = re.findall(r'\b(\d{5}-\d{5})\b', text)
    if not codes:
        flash('Keine gültigen Voucher-Codes gefunden.', 'error')
        return redirect(url_for('admin_dashboard'))

    conn = get_db()
    c = conn.cursor()
    imported = 0
    skipped = 0
    for code in codes:
        try:
            c.execute('INSERT INTO vouchers (code) VALUES (%s)', (code,))
            imported += 1
        except mysql.connector.IntegrityError:
            skipped += 1
    conn.commit()
    conn.close()
    flash(f'{imported} Voucher(s) importiert, {skipped} bereits vorhanden.', 'success')
    return redirect(url_for('admin_dashboard'))


@app.route('/admin/delete/<int:vid>', methods=['POST'])
@login_required
def admin_delete(vid):
    conn = get_db()
    c = conn.cursor()
    c.execute('DELETE FROM vouchers WHERE id = %s', (vid,))
    conn.commit()
    conn.close()
    return jsonify({'ok': True})


if __name__ == '__main__':
    init_db()
    app.run(debug=True, host='0.0.0.0', port=5000)