import os
import json
from http.server import HTTPServer, SimpleHTTPRequestHandler
from datetime import datetime
import sys

# Automatically handle dependencies: install openpyxl if it's missing
try:
    import openpyxl
except ImportError:
    import subprocess
    print("Библиотека 'openpyxl' не найдена. Устанавливаем...")
    try:
        subprocess.check_call([sys.executable, "-m", "pip", "install", "openpyxl"])
        import openpyxl
        print("Библиотека 'openpyxl' успешно установлена!")
    except Exception as e:
        print(f"Ошибка при автоматической установке openpyxl: {e}")
        print("Пожалуйста, установите её вручную: pip install openpyxl")
        sys.exit(1)

from openpyxl import Workbook, load_workbook
from openpyxl.styles import Font, Alignment, PatternFill

# Add parent directory to sys.path to load database.py and config.py
PARENT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
if PARENT_DIR not in sys.path:
    sys.path.append(PARENT_DIR)

try:
    import config
    from database import DatabaseManager
    db = DatabaseManager(db_path=os.path.join(PARENT_DIR, "bot_database.db"))
except Exception as e:
    print(f"Предупреждение: Не удалось загрузить модули базы данных/конфигурации: {e}")
    db = None
    config = None

try:
    import vk_api
    from vk_api.utils import get_random_id
except ImportError:
    vk_api = None

# Path to the Excel spreadsheet in the same directory as server.py
SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
FILE_NAME = os.path.join(SCRIPT_DIR, "registration_for_training.xlsx")

def init_excel():
    """Create the Excel file with styled headers if it doesn't exist."""
    recreate = False
    if os.path.exists(FILE_NAME):
        try:
            wb = load_workbook(FILE_NAME)
            ws = wb.active
            # Recreate if it does not have the 'id_user' column as the first header
            if ws.cell(row=1, column=1).value != "id_user":
                recreate = True
        except Exception:
            recreate = True

    if recreate:
        try:
            os.remove(FILE_NAME)
            print("Обнаружена старая структура Excel файла. Пересоздаём с колонкой 'id_user'...")
        except Exception as e:
            print(f"Не удалось удалить старый Excel файл: {e}")

    if not os.path.exists(FILE_NAME):
        wb = Workbook()
        ws = wb.active
        ws.title = "Заявки на обучение"
        
        headers = [
            "id_user",
            "Имя", 
            "Номер телефона", 
            "E-mail", 
            "Ссылка на профиль ВКонтакте", 
            "Согласие с офертой", 
            "Согласие с политикой", 
            "Согласие на рассылку", 
            "Дата регистрации"
        ]
        
        ws.append(headers)
        
        # Style header cells (Bold white text, dark blue/gray background)
        header_font = Font(name="Calibri", size=11, bold=True, color="FFFFFF")
        header_fill = PatternFill(start_color="1F4E78", end_color="1F4E78", fill_type="solid")
        header_align = Alignment(horizontal="center", vertical="center")
        
        for col_num, header in enumerate(headers, 1):
            cell = ws.cell(row=1, column=col_num)
            cell.font = header_font
            cell.fill = header_fill
            cell.alignment = header_align
            
        # Adjust column widths
        column_widths = [15, 20, 25, 25, 30, 20, 22, 22, 22]
        for i, width in enumerate(column_widths, 1):
            ws.column_dimensions[openpyxl.utils.get_column_letter(i)].width = width
            
        wb.save(FILE_NAME)
        print(f"Создан новый файл Excel с колонкой id_user: {FILE_NAME}")

def get_next_user_id(ws):
    """Generate the next unique user ID in the format id_001, id_002..."""
    max_row = ws.max_row
    if max_row <= 1:
        return "id_001"
    
    # Read the ID from the last row's first cell
    last_id_val = ws.cell(row=max_row, column=1).value
    if not last_id_val or not str(last_id_val).startswith("id_"):
        # Fallback to row counts if the last row ID is corrupted/not matching mask
        return f"id_{(max_row - 1):03d}"
    
    try:
        # Extract the numeric suffix, increment, and format back
        numeric_part = int(str(last_id_val).split("_")[1])
        next_num = numeric_part + 1
        return f"id_{next_num:03d}"
    except (IndexError, ValueError):
        return f"id_{max_row:03d}"

def add_registration(data):
    """Append a new form submission row into the Excel sheet."""
    init_excel()
    
    try:
        wb = load_workbook(FILE_NAME)
        ws = wb.active
    except Exception as e:
        print(f"Ошибка загрузки Excel файла, пересоздаём: {e}")
        init_excel()
        wb = load_workbook(FILE_NAME)
        ws = wb.active
        
    current_time = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
    
    # Auto-generate next user ID
    next_id = get_next_user_id(ws)
    
    row = [
        next_id,
        data.get("name", "").strip(),
        data.get("phone", "").strip(),
        data.get("email", "").strip(),
        data.get("vk", "").strip(),
        "Да" if data.get("agreeOferta") else "Нет",
        "Да" if data.get("agreePolicy") else "Нет",
        "Да" if data.get("agreeNewsletter") else "Нет",
        current_time
    ]
    
    ws.append(row)
    
    # Align data cells
    new_row_index = ws.max_row
    data_align_left = Alignment(horizontal="left", vertical="center")
    data_align_center = Alignment(horizontal="center", vertical="center")
    
    for col_idx in range(1, len(row) + 1):
        cell = ws.cell(row=new_row_index, column=col_idx)
        # Left align Name (2), Email (4), VK Link (5). Center align others.
        if col_idx in [2, 4, 5]:
            cell.alignment = data_align_left
        else:
            cell.alignment = data_align_center
            
    wb.save(FILE_NAME)
    print(f"[{current_time}] Добавлена новая запись в Excel: ID={row[0]}, Имя={row[1]}, Телефон={row[2]}")

    # 1. Запись в SQLite базу данных
    if db:
        try:
            db.add_web_registration(next_id, data)
            print(f"[{current_time}] Заявка {next_id} успешно сохранена в SQLite (таблица web_registrations).")
        except Exception as db_err:
            print(f"[{current_time}] Ошибка записи заявки в SQLite: {db_err}")
            
    # 2. Отправка уведомления оператору в VK
    try:
        send_vk_operator_notification(next_id, data)
    except Exception as vk_err:
        print(f"[{current_time}] Ошибка при отправке уведомления оператору: {vk_err}")


def send_vk_operator_notification(reg_id, data):
    """Отправить уведомление о новой веб-заявке в VK-чат оператора."""
    if not vk_api or not config:
        print("[VK NOTIFICATION] Пропущено: vk_api или конфигурация недоступны.")
        return
    
    token = getattr(config, "VK_TOKEN", "your_vk_community_token_here")
    operator_id = getattr(config, "OPERATOR_PEER_ID", 0)
    
    if not token or token == "your_vk_community_token_here" or not operator_id:
        print("[VK NOTIFICATION] Пропущено: Токен VK или ID оператора не настроены в .env.")
        return

    try:
        vk_session = vk_api.VkApi(token=token)
        vk = vk_session.get_api()
        
        # Формируем сообщение для оператора
        message = (
            f"🌐 **Новая заявка с сайта!**\n\n"
            f"🆔 ID заявки: {reg_id}\n"
            f"👤 Имя: {data.get('name', '').strip()}\n"
            f"📞 Телефон: {data.get('phone', '').strip()}\n"
            f"✉️ E-mail: {data.get('email', '').strip()}\n"
            f"🌐 Профиль VK: {data.get('vk', '').strip()}\n\n"
            f"⚖️ Согласия пользователя:\n"
            f"• Оферта: {'Да' if data.get('agreeOferta') else 'Нет'}\n"
            f"• Политика ПД: {'Да' if data.get('agreePolicy') else 'Нет'}\n"
            f"• Рассылка: {'Да' if data.get('agreeNewsletter') else 'Нет'}\n\n"
            f"Данные сохранены в Excel и базу данных SQLite."
        )
        
        vk.messages.send(
            peer_id=operator_id,
            message=message,
            random_id=get_random_id()
        )
        print(f"[VK NOTIFICATION] Успешно отправлено уведомление оператору (ID: {operator_id}) для заявки {reg_id}.")
    except Exception as e:
        print(f"[VK NOTIFICATION] Ошибка при отправке уведомления в VK: {e}")

class FormHandler(SimpleHTTPRequestHandler):
    """Custom HTTP handler serving form files and processing POST requests."""
    
    def translate_path(self, path):
        # Override translate_path to serve static files from the 'form' directory
        # even if launched from the parent directory
        path = SimpleHTTPRequestHandler.translate_path(self, path)
        rel_path = os.path.relpath(path, os.getcwd())
        return os.path.join(SCRIPT_DIR, rel_path)

    def do_POST(self):
        if self.path == '/submit':
            content_length = int(self.headers['Content-Length'])
            post_data = self.rfile.read(content_length)
            
            try:
                data = json.loads(post_data.decode('utf-8'))
                add_registration(data)
                
                self.send_response(200)
                self.send_header('Content-Type', 'application/json')
                self.send_header('Access-Control-Allow-Origin', '*')  # Prevent CORS errors
                self.end_headers()
                
                response = {"status": "success", "message": "Заявка успешно записана!"}
                self.wfile.write(json.dumps(response).encode('utf-8'))
            except PermissionError:
                self.send_response(500)
                self.send_header('Content-Type', 'application/json')
                self.send_header('Access-Control-Allow-Origin', '*')
                self.end_headers()
                
                response = {
                    "status": "error", 
                    "message": "Таблица Excel заблокирована. Пожалуйста, закройте файл 'registration_for_training.xlsx' в Excel и отправьте форму заново."
                }
                self.wfile.write(json.dumps(response).encode('utf-8'))
            except Exception as e:
                self.send_response(500)
                self.send_header('Content-Type', 'application/json')
                self.send_header('Access-Control-Allow-Origin', '*')
                self.end_headers()
                
                response = {"status": "error", "message": str(e)}
                self.wfile.write(json.dumps(response).encode('utf-8'))
        else:
            self.send_response(404)
            self.end_headers()
            
    def do_OPTIONS(self):
        # Respond to CORS preflight requests
        self.send_response(204)
        self.send_header('Access-Control-Allow-Origin', '*')
        self.send_header('Access-Control-Allow-Methods', 'POST, GET, OPTIONS')
        self.send_header('Access-Control-Allow-Headers', 'Content-Type')
        self.end_headers()

def run_server(port=8000):
    init_excel()  # Pre-create Excel on startup
    server_address = ('', port)
    httpd = HTTPServer(server_address, FormHandler)
    print(f"\n=======================================================")
    print(f"Сервер ИКП запущен на http://localhost:{port}/")
    print(f"Вы можете открыть форму по адресу: http://localhost:{port}/index.html")
    print(f"Данные будут записываться в: {FILE_NAME}")
    print(f"Нажмите Ctrl+C для остановки сервера.")
    print(f"=======================================================\n")
    try:
        httpd.serve_forever()
    except KeyboardInterrupt:
        print("\nСервер останавливается...")
        httpd.server_close()

if __name__ == '__main__':
    run_server()