import os
import requests
from django.http import JsonResponse
import json
from dotenv import load_dotenv
from django.views.decorators.csrf import csrf_exempt

# Load environment variables
load_dotenv(override=True)

def get_base_url(service_name):
    service_urls = {
        # Update this dictionary based on your microservices
        'testService': os.getenv("TEST_SERVICE_HOST"),
    }
    if service_name in service_urls:
        return service_urls[service_name]
    else:
        raise ValueError(f"Invalid service name: {service_name}")

def make_request(method, url, headers, data=None):
    try:
        if method == 'GET':
            response = requests.get(url, headers=headers, timeout=10)
        elif method == 'POST':
            response = requests.post(url, headers=headers, json=data, timeout=10)
        elif method == 'PATCH':
            response = requests.patch(url, headers=headers, json=data, timeout=10)
        elif method == 'PUT':
            response = requests.put(url, headers=headers, json=data, timeout=10)
        elif method == 'DELETE':
            response = requests.delete(url, headers=headers, timeout=10)
            if response.status_code == 204:
                return JsonResponse({'message': 'Successfully deleted'}, status=200)
        
        # Return response based on status code
        if 200 <= response.status_code < 300:
            return JsonResponse(response.json(), safe=False, status=response.status_code)
        return JsonResponse(response.json(), safe=False, status=response.status_code)
    
    except requests.exceptions.Timeout:
        return JsonResponse({'error': 'The request timed out. Please try again.'}, status=504)
    except requests.exceptions.ConnectionError:
        return JsonResponse({'error': 'Failed to connect to the external service. Please try again later.'}, status=502)
    except requests.exceptions.RequestException as e:
        return JsonResponse({'error': str(e)}, status=500)

@csrf_exempt
def handle_request(request, service_name, endpoint, id=None):
    try:
        base_url = get_base_url(service_name)
        api_url = os.path.join(base_url, f'api/v1/{endpoint}/')
        if id:
            api_url = os.path.join(api_url, f'{id}/')
        
        headers = {
            'gateway-key': os.getenv("GATEWAY_KEY"),
            'Content-Type': 'application/json',
        }

        # Forward the request to the external service
        if request.method == 'GET':
            return make_request('GET', api_url, headers)
        elif request.method == 'POST':
            json_data = json.loads(request.body) if request.body else None
            return make_request('POST', api_url, headers, data=json_data)
        elif request.method == 'PATCH' and id:
            json_data = json.loads(request.body) if request.body else None
            return make_request('PATCH', api_url, headers, data=json_data)
        elif request.method == 'PUT' and id:
            json_data = json.loads(request.body) if request.body else None
            return make_request('PUT', api_url, headers, data=json_data)
        elif request.method == 'DELETE' and id:
            return make_request('DELETE', api_url, headers)
        else:
            return JsonResponse({'error': 'Invalid HTTP method'}, status=405)
    
    except ValueError as e:
        return JsonResponse({'error': str(e)}, status=400)
    except Exception as e:
        return JsonResponse({'error': 'An unexpected error occurred.'}, status=500)

@csrf_exempt
def custom_request(request, service_name, endpoint, payload=None, id=None):
    try:
        base_url = get_base_url(service_name)
        api_url = os.path.join(base_url, f'api/v1/{endpoint}/')
        if id:
            api_url = os.path.join(api_url, f'{id}/')

        headers = {
            'gateway-key': os.getenv("GATEWAY_KEY"),
            'Content-Type': 'application/json',
        }

        # Forward the request to the external service
        if request.method == 'GET':
            return make_request('GET', api_url, headers)
        elif request.method == 'POST':
            return make_request('POST', api_url, headers, data=payload)
        elif request.method == 'PATCH' and id:
            return make_request('PATCH', api_url, headers, data=payload)
        elif request.method == 'PUT' and id:
            return make_request('PUT', api_url, headers, data=payload)
        elif request.method == 'DELETE' and id:
            return make_request('DELETE', api_url, headers)
        else:
            return JsonResponse({'error': 'Invalid HTTP method'}, status=405)
    
    except ValueError as e:
        return JsonResponse({'error': str(e)}, status=400)
    except Exception as e:
        return JsonResponse({'error': 'An unexpected error occurred.'}, status=500)