from flask import Flask, render_template, request, redirect, url_for, flash, session, jsonify
import logging
from datetime import datetime
from db import get_db_connection, fetch_users, fetch_orders, fetch_roles, fetch_repairs, fetch_employees, fetch_products, update_product, add_product_stock
from auth import encrypt_password, check_password
import sqlite3

app = Flask(__name__)
app.secret_key = 'e462a50b0401f495cfb5c67c3871fe4b'

# ----------------- Logging part not related to project requirements -----------------
# Set up custom logging
logging.basicConfig(level=logging.DEBUG)

# Remove werkzeug logs by setting its logger to a higher level (e.g., ERROR)
werkzeug_logger = logging.getLogger('werkzeug')
werkzeug_logger.setLevel(logging.ERROR)

# Log client IP before each request
@app.before_request
def log_client_ip():
    if request.remote_addr == '127.0.0.1':
        client_ip = request.headers.get('CF-Connecting-IP', request.headers.get('X-Forwarded-For', request.remote_addr))
    else:
        client_ip = request.remote_addr
    client_ip = client_ip.split(',')[0]  # Get the first IP if it's a forwarded request
    request.client_ip = client_ip  # Store the client IP in the request context

# Override werkzeug's default logging to show client IP in the access log
@app.after_request
def log_request(response):
    if request.remote_addr == '127.0.0.1':
        client_ip = request.headers.get('CF-Connecting-IP', request.headers.get('X-Forwarded-For', request.remote_addr))
    else:
        client_ip = request.remote_addr
    client_ip = client_ip.split(',')[0]  # Get the first IP if it's a forwarded request
    app.logger.info(f"{client_ip} - - [{request.date}] \"{request.method} {request.full_path} {request.environ.get('SERVER_PROTOCOL')}\" {response.status_code}")
    return response
# ----------------- End of logging part -----------------

# Routes
@app.route('/logout')
def logout():
    session.pop('logged_in', None)
    session.pop('role_id', None)
    session.pop('username', None)
    session.pop('user_id', None)
    return '''
    <script>
        alert('Úspěšně odhlášen.');
        window.location.href = '/';
    </script>
    '''

@app.route('/login', methods=['GET', 'POST'])
def login():
    if session.get('logged_in'):
        flash('Již jste přihlášen.', 'info')
        if session.get('role_id') == 1:
            return redirect(url_for('administrator'))
        elif session.get('role_id') == 2:
            return redirect(url_for('managers'))
        elif session.get('role_id') == 3:
            return redirect(url_for('repairs'))
        else:
            return redirect(url_for('home'))
    
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        
        conn = get_db_connection()
        user = conn.execute('SELECT * FROM Zamestnanci WHERE username = ?', (username,)).fetchone()
        conn.close()
        
        if user is None or not check_password(user['heslo'], password):
            return '''
            <script>
                alert('Nesprávné uživatelské jméno nebo heslo.');
                window.location.href = '/login';
            </script>
            '''
        else:
            session['logged_in'] = True
            session['role_id'] = user['Role_ID']
            session['username'] = user['Username']
            session['user_id'] = user['ID_Uzivatele']
            flash('Úspěšně přihlášen.', 'success')
            if user['Role_ID'] == 1:
                return redirect(url_for('administrator'))
            elif user['Role_ID'] == 2:
                return redirect(url_for('managers'))
            elif user['Role_ID'] == 3:
                return redirect(url_for('repairs'))
            else:
                return redirect(url_for('home'))
    
    return render_template('login.html')

@app.route('/')
def home():
    greeting = "Hello, Python!"
    current_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
    return render_template('home.html', greeting=greeting, current_time=current_time)

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

@app.route('/administrator')
def administrator():
    if not session.get('logged_in') or session.get('role_id') != 1:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    users = fetch_users(session.get('role_id'))
    orders = fetch_orders()
    roles = fetch_roles()
    products = fetch_products()
    return render_template('administrator.html', users=users, orders=orders, roles=roles, products=products)

@app.route('/managers')
def managers():
    if not session.get('logged_in') or session.get('role_id') not in [1, 2]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    users = fetch_users(session.get('role_id'))
    orders = fetch_orders()
    roles = fetch_roles()
    return render_template('managers.html', users=users, orders=orders, roles=roles)

@app.route('/create_user', methods=['GET', 'POST'])
def create_user():
    if not session.get('logged_in') or session.get('role_id') not in [1, 2]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    
    if request.method == 'POST':
        jmeno = request.form['jmeno']
        prijmeni = request.form['prijmeni']
        email = request.form['email']
        role = request.form['role']
        username = request.form['username']
        heslo = encrypt_password(request.form['heslo'])
        
        conn = get_db_connection()
        existing_user = conn.execute('SELECT * FROM Zamestnanci WHERE Username = ?', (username,)).fetchone()
        
        if existing_user:
            conn.close()
            return 'exists'
        
        try:
            conn.execute('INSERT INTO Zamestnanci (Jmeno, Prijmeni, Email, Role_ID, Username, Heslo) VALUES (?, ?, ?, ?, ?, ?)',
                         (jmeno, prijmeni, email, role, username, heslo))
            conn.commit()
            return 'success'
        except sqlite3.Error as e:
            return f'error: {e}'
        finally:
            conn.close()
    
    roles = fetch_roles()
    return render_template('create_user.html', roles=roles)

@app.route('/edit_user/<int:user_id>', methods=['GET', 'POST'])
def edit_user(user_id):
    if not session.get('logged_in') or session.get('role_id') not in [1, 2]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    
    conn = get_db_connection()
    user = conn.execute('SELECT * FROM Zamestnanci WHERE ID_Uzivatele = ?', (user_id,)).fetchone()
    
    if request.method == 'POST':
        jmeno = request.form['jmeno']
        prijmeni = request.form['prijmeni']
        email = request.form['email']
        role = request.form['role']
        username = request.form['username']
        heslo = request.form['heslo']
        
        if heslo:
            heslo = encrypt_password(heslo)
            conn.execute('UPDATE Zamestnanci SET Jmeno = ?, Prijmeni = ?, Email = ?, Role_ID = ?, Username = ?, Heslo = ? WHERE ID_Uzivatele = ?',
                         (jmeno, prijmeni, email, role, username, heslo, user_id))
        else:
            conn.execute('UPDATE Zamestnanci SET Jmeno = ?, Prijmeni = ?, Email = ?, Role_ID = ?, Username = ? WHERE ID_Uzivatele = ?',
                         (jmeno, prijmeni, email, role, username, user_id))
        
        conn.commit()
        conn.close()
        
        flash('Uživatel byl úspěšně aktualizován.')
        return redirect(url_for('administrator'))
    
    conn.close()
    return render_template('edit_user.html', user=user)

@app.route('/delete_user/<int:user_id>', methods=['POST'])
def delete_user(user_id):
    if not session.get('logged_in') or session.get('role_id') not in [1, 2]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    
    conn = get_db_connection()
    user = conn.execute('SELECT * FROM Zamestnanci WHERE ID_Uzivatele = ?', (user_id,)).fetchone()
    
    if user and user['Role_ID'] > session.get('role_id'):
        conn.execute('DELETE FROM Zamestnanci WHERE ID_Uzivatele = ?', (user_id,))
        conn.commit()
        flash('Uživatel byl úspěšně smazán.')
    else:
        flash('Nemáte oprávnění smazat tohoto uživatele.', 'error')
    
    conn.close()
    return redirect(url_for('administrator'))

@app.route('/edit_order/<int:order_id>', methods=['GET', 'POST'])
def edit_order(order_id):
    if not session.get('logged_in') or session.get('role_id') not in [1, 2, 3]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    
    conn = get_db_connection()
    order = conn.execute('SELECT * FROM Objednavky WHERE ID_Objednavky = ?', (order_id,)).fetchone()
    users = fetch_users(session.get('role_id'))
    
    if request.method == 'POST':
        stav = request.form['stav']
        id_zamestnance = request.form['id_zamestnance']
        popis = request.form['popis']
        datum_konce = request.form['datum_konce']
        
        conn.execute('UPDATE Objednavky SET Stav = ?, ID_Zamestnance = ?, Popis = ?, Datum_Konce = ? WHERE ID_Objednavky = ?',
                     (stav, id_zamestnance, popis, datum_konce, order_id))
        
        conn.commit()
        conn.close()
        
        flash('Objednávka byla úspěšně aktualizována.')
        return redirect(url_for('administrator'))
    
    conn.close()
    return render_template('edit_order.html', order=order, users=users)

@app.route('/delete_order/<int:order_id>', methods=['POST'])
def delete_order(order_id):
    if not session.get('logged_in') or session.get('role_id') not in [1, 2, 3]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    
    conn = get_db_connection()
    conn.execute('DELETE FROM Objednavky WHERE ID_Objednavky = ?', (order_id,))
    conn.commit()
    conn.close()
    
    flash('Objednávka byla úspěšně smazána.')
    return redirect(url_for('administrator'))

@app.route('/repairs')
def repairs():
    if not session.get('logged_in') or session.get('role_id') not in [1, 3]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    repairs = fetch_repairs()
    orders = fetch_orders()
    users = fetch_users(session.get('role_id'))
    return render_template('repairs.html', repairs=repairs, orders=orders, users=users)

@app.route('/create_repair', methods=['GET', 'POST'])
def create_repair():
    if not session.get('logged_in') and session.get('role_id') != 1 or session.get('role_id') not in [1, 3]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    
    if request.method == 'POST':
        id_zamestnance = request.form['id_zamestnance']
        nazev = request.form['nazev']
        popis = request.form['popis']
        products = [{'id': pid, 'quantity': qty} for pid, qty in zip(request.form.getlist('products[0][id]'), request.form.getlist('products[0][quantity]'))]
        
        app.logger.debug(f"Received id_zamestnance: {id_zamestnance}")
        app.logger.debug(f"Received nazev: {nazev}")
        app.logger.debug(f"Received popis: {popis}")
        app.logger.debug(f"Received products: {products}")
        
        conn = get_db_connection()
        try:
            conn.execute('BEGIN')
            sql_insert_repair = 'INSERT INTO Opravy (ID_Zamestnance, Nazev, Popis) VALUES (?, ?, ?)'
            app.logger.debug(f"Executing SQL: {sql_insert_repair} with values ({id_zamestnance}, {nazev}, {popis})")
            conn.execute(sql_insert_repair, (id_zamestnance, nazev, popis))
            repair_id = conn.execute('SELECT last_insert_rowid()').fetchone()[0]
            
            debug_info = f"Inserted Repair ID: {repair_id}\n"
            
            for product in products:
                product_id = product['id']
                quantity = product['quantity']
                app.logger.debug(f"Inserting product {product_id} with quantity {quantity} for repair {repair_id}")
                if quantity and int(quantity) > 0:
                    conn.execute('INSERT INTO Pouzite_Produkty (ID_Opravy, ID_Produktu, Pocet_Produktu) VALUES (?, ?, ?)',
                                 (repair_id, product_id, quantity))
                    debug_info += f"Inserted Product ID: {product_id}, Quantity: {quantity}\n"
            
            conn.commit()
            session['debug'] = debug_info
            flash('Nová oprava byla úspěšně vytvořena.', 'success')
            return redirect(url_for('repairs'))
        except sqlite3.Error as e:
            conn.rollback()
            app.logger.error(f"Error creating repair: {e}")
            flash(f'Chyba při vytváření opravy: {e}', 'error')
        finally:
            conn.close()
    
    employees = fetch_employees()
    products = fetch_products()
    return render_template('create_repair.html', employees=employees, products=products)

@app.route('/edit_repair/<int:repair_id>', methods=['GET', 'POST'])
def edit_repair(repair_id):
    if not session.get('logged_in') or session.get('role_id') not in [1, 3]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    
    conn = get_db_connection()
    repair = conn.execute('SELECT * FROM Opravy WHERE ID_Opravy = ?', (repair_id,)).fetchone()
    repair = dict(repair)
    
    if request.method == 'POST':
        id_zamestnance = request.form['id_zamestnance']
        nazev = request.form['nazev']
        popis = request.form['popis']
        products = [{'id': pid, 'quantity': qty} for pid, qty in zip(request.form.getlist('products[][id]'), request.form.getlist('products[][quantity]'))]
        
        conn.execute('BEGIN')
        try:
            conn.execute('UPDATE Opravy SET ID_Zamestnance = ?, Nazev = ?, Popis = ? WHERE ID_Opravy = ?',
                         (id_zamestnance, nazev, popis, repair_id))
            
            conn.execute('DELETE FROM Pouzite_Produkty WHERE ID_Opravy = ?', (repair_id,))
            
            for product in products:
                product_id = product['id']
                quantity = product['quantity']
                if quantity and int(quantity) > 0:
                    conn.execute('INSERT INTO Pouzite_Produkty (ID_Opravy, ID_Produktu, Pocet_Produktu) VALUES (?, ?, ?)',
                                 (repair_id, product_id, quantity))
            
            conn.commit()
            flash('Oprava byla úspěšně aktualizována.')
        except sqlite3.Error as e:
            conn.rollback()
            app.logger.error(f"Error updating repair: {e}")
            flash(f'Chyba při aktualizaci opravy: {e}', 'error')
        finally:
            conn.close()
        
        return redirect(url_for('repairs'))
    
    employees = fetch_employees()
    products = fetch_products()
    repair['products'] = [dict(row) for row in conn.execute('''
        SELECT Produkty.ID_Produktu, Produkty.Nazev, Pouzite_Produkty.Pocet_Produktu
        FROM Pouzite_Produkty
        JOIN Produkty ON Pouzite_Produkty.ID_Produktu = Produkty.ID_Produktu
        WHERE Pouzite_Produkty.ID_Opravy = ?
    ''', (repair_id,)).fetchall()]
    conn.close()
    return render_template('edit_repair.html', repair=repair, employees=employees, products=products)

@app.route('/delete_repair/<int:repair_id>', methods=['POST'])
def delete_repair(repair_id):
    if not session.get('logged_in') or session.get('role_id') not in [1, 2, 3]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    
    conn = get_db_connection()
    conn.execute('DELETE FROM Opravy WHERE ID_Opravy = ?', (repair_id,))
    conn.commit()
    conn.close()
    
    flash('Oprava byla úspěšně smazána.')
    return redirect(url_for('repairs'))

@app.route('/create_reservation', methods=['POST'])
def create_reservation():
    full_name = request.form['fullName']
    email = request.form['email']
    datum_konce = request.form['datum_konce']
    description = request.form['description']
    
    conn = get_db_connection()
    try:
        # Fetch a random user with role_id 3
        user = conn.execute('SELECT ID_Uzivatele FROM Zamestnanci WHERE Role_ID = 3 ORDER BY RANDOM() LIMIT 1').fetchone()
        if user:
            user_id = user['ID_Uzivatele']
        else:
            user_id = 1  # Fallback to a default user ID if no user with role_id 3 is found
        
        conn.execute('INSERT INTO Objednavky (Stav, ID_Zamestnance, Popis, ID_Vozidla, Datum_Zacatku, Datum_Konce, Cena) VALUES (?, ?, ?, ?, ?, ?, ?)',
                     ('Nová', user_id, description, 1, datetime.now().strftime('%Y-%m-%d'), datum_konce, 0.0))  # Use the current date for Datum_Zacatku
        conn.commit()
        flash('Rezervace byla úspěšně vytvořena.', 'success')
    except sqlite3.Error as e:
        flash(f'Chyba při vytváření rezervace: {e}', 'error')
    finally:
        conn.close()
    
    return '''
    <script>
        alert('Rezervace byla úspěšně vytvořena.');
        window.location.href = '/';
    </script>
    '''

@app.route('/edit_product/<int:product_id>', methods=['GET', 'POST'])
def edit_product(product_id):
    if not session.get('logged_in') or session.get('role_id') not in [1, 2]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    
    conn = get_db_connection()
    product = conn.execute('SELECT * FROM Produkty WHERE ID_Produktu = ?', (product_id,)).fetchone()
    
    if request.method == 'POST':
        nazev = request.form['nazev']
        popis = request.form['popis']
        momentalni_zasoba = request.form['momentalni_zasoba']
        minimalni_zasoba = request.form['minimalni_zasoba']
        
        update_product(product_id, nazev, popis, momentalni_zasoba, minimalni_zasoba)
        
        flash('Produkt byl úspěšně aktualizován.')
        return redirect(url_for('administrator'))
    
    conn.close()
    return render_template('edit_product.html', product=product)

@app.route('/add_product_stock/<int:product_id>', methods=['GET', 'POST'])
def add_product_stock(product_id):
    if not session.get('logged_in') or session.get('role_id') not in [1, 2]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    
    conn = get_db_connection()
    product = conn.execute('SELECT * FROM Produkty WHERE ID_Produktu = ?', (product_id,)).fetchone()
    
    if request.method == 'POST':
        quantity = request.form['quantity']
        
        add_product_stock(product_id, quantity)
        
        flash('Zásoba byla úspěšně přidána.')
        return redirect(url_for('administrator'))
    
    conn.close()
    return render_template('add_product_stock.html', product=product)

@app.route('/create_product', methods=['GET', 'POST'])
def create_product():
    if not session.get('logged_in') or session.get('role_id') not in [1, 2]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    
    if request.method == 'POST':
        nazev = request.form['nazev']
        popis = request.form['popis']
        momentalni_zasoba = request.form['momentalni_zasoba']
        minimalni_zasoba = request.form['minimalni_zasoba']
        
        conn = get_db_connection()
        try:
            conn.execute('INSERT INTO Produkty (Nazev, Popis, Momentalni_Zasoba, Minimalni_Zasoba) VALUES (?, ?, ?, ?)',
                         (nazev, popis, momentalni_zasoba, minimalni_zasoba))
            conn.commit()
            flash('Nový produkt byl úspěšně přidán.', 'success')
            return redirect(url_for('administrator'))
        except sqlite3.Error as e:
            flash(f'Chyba při přidávání produktu: {e}', 'error')
        finally:
            conn.close()
    

    
    return render_template('create_product.html')

@app.route('/statistics')
def statistics():
    if not session.get('logged_in') or session.get('role_id') not in [1, 2]:
        flash('Nemáte oprávnění k přístupu na tuto stránku.', 'error')
        return redirect(url_for('login'))
    
    conn = get_db_connection()
    repairs_data = conn.execute('''
        SELECT Zamestnanci.Jmeno || ' ' || Zamestnanci.Prijmeni AS employee, COUNT(Opravy.ID_Opravy) AS count
        FROM Opravy
        JOIN Zamestnanci ON Opravy.ID_Zamestnance = Zamestnanci.ID_Uzivatele
        GROUP BY Zamestnanci.ID_Uzivatele
    ''').fetchall()
    repairs_data = [dict(employee=row['employee'], count=row['count']) for row in repairs_data]
    conn.close()
    return render_template('statistics.html', repairs_data=repairs_data)

@app.route('/repairs_by_date')
def repairs_by_date():
    start_date = request.args.get('start')
    end_date = request.args.get('end')
    
    conn = get_db_connection()
    repairs_data = conn.execute('''
        SELECT DATE(Datum_Zacatku) AS date, COUNT(*) AS count
        FROM Objednavky
        WHERE Datum_Zacatku BETWEEN ? AND ?
        GROUP BY DATE(Datum_Zacatku)
    ''', (start_date, end_date)).fetchall()
    repairs_data = [dict(date=row['date'], count=row['count']) for row in repairs_data]
    conn.close()
    
    return jsonify(repairs_data)

# Always redirect back home
@app.errorhandler(404)
def default_page(e):
    return redirect(url_for('home'))

# Run the app
if __name__ == "__main__":
    app.run(debug=True, host="0.0.0.0", port=5005)