def number_to_words_en(number):
    """
    Converts a number to English words.
    Handles decimals up to 3 places.
    """
    if number == 0:
        return "Zero"

    units = ["", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", 
             "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"]
    tens = ["", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"]
    thousands = ["", "Thousand", "Million", "Billion"]

    def _convert_less_than_thousand(num):
        res = ""
        if num >= 100:
            res += units[num // 100] + " Hundred "
            num %= 100
        if num >= 20:
            res += tens[num // 10] + " "
            num %= 10
        if num > 0:
            res += units[num]
        return res.strip()

    try:
        parts = str(float(number)).split('.')
        integer_part = int(parts[0])
        fractional_part = int(parts[1]) if len(parts) > 1 else 0
    except ValueError:
        return "Invalid Number"

    res = ""
    if integer_part == 0:
        res = "Zero"
    else:
        idx = 0
        while integer_part > 0:
            if integer_part % 1000 != 0:
                res = _convert_less_than_thousand(integer_part % 1000) + " " + thousands[idx] + " " + res
            integer_part //= 1000
            idx += 1
    
    words = res.strip()

    if fractional_part > 0:
        frac_str = parts[1]
        denom = 10 ** len(frac_str)
        words += f" and {fractional_part}/{denom}"

    return words

def number_to_words_ar(number):
    return number_to_words_en(number)

def send_whatsapp_message(phone, message):
    try:
        import requests
        from .models import SystemSetting
        
        settings = SystemSetting.objects.first()
        if not settings or not settings.wablas_enabled:
            return False, "WhatsApp gateway is disabled."
        
        if not settings.wablas_token or not settings.wablas_server_url:
            return False, "Wablas configuration is incomplete."

        phone = ''.join(filter(str.isdigit, str(phone)))
        server_url = settings.wablas_server_url.rstrip('/')
        url = f"{server_url}/api/send-message"
        
        headers = {
            "Authorization": settings.wablas_token,
            "Secret": settings.wablas_secret_key
        }
        
        payload = {"phone": phone, "message": message}
        
        response = requests.post(url, data=payload, headers=headers, timeout=10)
        data = response.json()
        if response.status_code == 200 and data.get('status') == True:
            return True, "Message sent successfully."
        else:
            return False, data.get('message', 'Unknown error from Wablas.')
    except Exception as e:
        return False, str(e)

def send_whatsapp_document(phone, document_url, caption=""):
    try:
        import requests
        from .models import SystemSetting
        
        settings = SystemSetting.objects.first()
        if not settings or not settings.wablas_enabled:
            return False, "WhatsApp gateway is disabled."
        
        if not settings.wablas_token or not settings.wablas_server_url:
            return False, "Wablas configuration is incomplete."

        phone = ''.join(filter(str.isdigit, str(phone)))
        server_url = settings.wablas_server_url.rstrip('/')
        url = f"{server_url}/api/send-document"
        
        headers = {
            "Authorization": settings.wablas_token,
            "Secret": settings.wablas_secret_key
        }
        
        payload = {
            "phone": phone,
            "document": document_url,
            "caption": caption
        }
        
        response = requests.post(url, data=payload, headers=headers, timeout=15)
        data = response.json()
        if response.status_code == 200 and data.get('status') == True:
            return True, "Document sent successfully."
        else:
            return False, data.get('message', 'Unknown error from Wablas.')
    except Exception as e:
        return False, str(e)