import json
import docker
from django.http import HttpResponse
from .models import DockerSites
from loginSystem.models import Administrator
from plogical.acl import ACLManager
from django.shortcuts import redirect
from loginSystem.views import loadLoginPage
from django.views.decorators.csrf import csrf_exempt
from plogical.CyberCPLogFileWriter import CyberCPLogFileWriter as logging
import requests
import re

def require_login(view_func):
    def wrapper(request, *args, **kwargs):
        try:
            userID = request.session['userID']
            return view_func(request, *args, **kwargs)
        except KeyError:
            return redirect(loadLoginPage)
    return wrapper

class DockerManager:
    def __init__(self):
        self.client = docker.from_env()

    def get_container(self, container_id):
        try:
            return self.client.containers.get(container_id)
        except docker.errors.NotFound:
            return None
        except Exception as e:
            logging.writeToFile(f"Error getting container {container_id}: {str(e)}")
            return None
            
    def get_n8n_version(self, container):
        try:
            # Execute npm list command in the container to get n8n version
            exec_result = container.exec_run(
                cmd="npm list n8n --json",
                workdir="/usr/local/lib/node_modules/n8n"
            )
            if exec_result.exit_code == 0:
                npm_output = json.loads(exec_result.output.decode())
                # Extract version from npm output
                if 'dependencies' in npm_output and 'n8n' in npm_output['dependencies']:
                    return npm_output['dependencies']['n8n']['version']
            return None
        except Exception as e:
            logging.writeToFile(f"Error getting n8n version: {str(e)}")
            return None

    def get_latest_n8n_version(self):
        try:
            # Fetch latest version from npm registry
            response = requests.get('https://registry.npmjs.org/n8n/latest')
            if response.status_code == 200:
                return response.json()['version']
            return None
        except Exception as e:
            logging.writeToFile(f"Error fetching latest n8n version: {str(e)}")
            return None

@csrf_exempt
@require_login
def startContainer(request):
    try:
        if request.method == 'POST':
            userID = request.session['userID']
            currentACL = ACLManager.loadedACL(userID)
            admin = Administrator.objects.get(pk=userID)

            data = json.loads(request.body)
            container_id = data.get('container_id')
            site_name = data.get('name')

            # Verify Docker site ownership
            try:
                docker_site = DockerSites.objects.get(SiteName=site_name)
                if currentACL['admin'] != 1 and docker_site.admin != admin and docker_site.admin.owner != admin.pk:
                    return HttpResponse(json.dumps({
                        'status': 0,
                        'error_message': 'Not authorized to access this container'
                    }))
            except DockerSites.DoesNotExist:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': 'Docker site not found'
                }))

            docker_manager = DockerManager()
            container = docker_manager.get_container(container_id)
            
            if not container:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': 'Container not found'
                }))

            container.start()
            return HttpResponse(json.dumps({'status': 1}))

        return HttpResponse('Not allowed')
    except Exception as e:
        return HttpResponse(json.dumps({
            'status': 0,
            'error_message': str(e)
        }))

@csrf_exempt
@require_login
def stopContainer(request):
    try:
        if request.method == 'POST':
            userID = request.session['userID']
            currentACL = ACLManager.loadedACL(userID)
            admin = Administrator.objects.get(pk=userID)

            data = json.loads(request.body)
            container_id = data.get('container_id')
            site_name = data.get('name')

            # Verify Docker site ownership
            try:
                docker_site = DockerSites.objects.get(SiteName=site_name)
                if currentACL['admin'] != 1 and docker_site.admin != admin and docker_site.admin.owner != admin.pk:
                    return HttpResponse(json.dumps({
                        'status': 0,
                        'error_message': 'Not authorized to access this container'
                    }))
            except DockerSites.DoesNotExist:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': 'Docker site not found'
                }))

            docker_manager = DockerManager()
            container = docker_manager.get_container(container_id)
            
            if not container:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': 'Container not found'
                }))

            container.stop()
            return HttpResponse(json.dumps({'status': 1}))

        return HttpResponse('Not allowed')
    except Exception as e:
        return HttpResponse(json.dumps({
            'status': 0,
            'error_message': str(e)
        }))

@csrf_exempt
@require_login
def restartContainer(request):
    try:
        if request.method == 'POST':
            userID = request.session['userID']
            currentACL = ACLManager.loadedACL(userID)
            admin = Administrator.objects.get(pk=userID)

            data = json.loads(request.body)
            container_id = data.get('container_id')
            site_name = data.get('name')

            # Verify Docker site ownership
            try:
                docker_site = DockerSites.objects.get(SiteName=site_name)
                if currentACL['admin'] != 1 and docker_site.admin != admin and docker_site.admin.owner != admin.pk:
                    return HttpResponse(json.dumps({
                        'status': 0,
                        'error_message': 'Not authorized to access this container'
                    }))
            except DockerSites.DoesNotExist:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': 'Docker site not found'
                }))

            docker_manager = DockerManager()
            container = docker_manager.get_container(container_id)
            
            if not container:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': 'Container not found'
                }))

            container.restart()
            return HttpResponse(json.dumps({'status': 1}))

        return HttpResponse('Not allowed')
    except Exception as e:
        return HttpResponse(json.dumps({
            'status': 0,
            'error_message': str(e)
        }))

@csrf_exempt
@require_login
def check_n8n_version(request):
    try:
        if request.method == 'POST':
            userID = request.session['userID']
            currentACL = ACLManager.loadedACL(userID)
            admin = Administrator.objects.get(pk=userID)

            data = json.loads(request.body)
            container_id = data.get('container_id')
            site_name = data.get('name')

            # Verify Docker site ownership
            try:
                docker_site = DockerSites.objects.get(SiteName=site_name)
                if currentACL['admin'] != 1 and docker_site.admin != admin and docker_site.admin.owner != admin.pk:
                    return HttpResponse(json.dumps({
                        'status': 0,
                        'error_message': 'Not authorized to access this container'
                    }))
            except DockerSites.DoesNotExist:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': 'Docker site not found'
                }))

            docker_manager = DockerManager()
            container = docker_manager.get_container(container_id)
            
            if not container:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': 'Container not found'
                }))

            # Get current version
            current_version = docker_manager.get_n8n_version(container)
            if not current_version:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': 'Could not determine current n8n version'
                }))

            # Get latest version
            latest_version = docker_manager.get_latest_n8n_version()
            if not latest_version:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': 'Could not fetch latest n8n version'
                }))

            # Compare versions
            update_available = current_version != latest_version

            return HttpResponse(json.dumps({
                'status': 1,
                'current_version': current_version,
                'latest_version': latest_version,
                'update_available': update_available
            }))

        return HttpResponse('Not allowed')
    except Exception as e:
        return HttpResponse(json.dumps({
            'status': 0,
            'error_message': str(e)
        }))

@csrf_exempt
@require_login
def update_n8n(request):
    try:
        if request.method == 'POST':
            userID = request.session['userID']
            currentACL = ACLManager.loadedACL(userID)
            admin = Administrator.objects.get(pk=userID)

            data = json.loads(request.body)
            container_id = data.get('container_id')
            site_name = data.get('name')

            # Verify Docker site ownership
            try:
                docker_site = DockerSites.objects.get(SiteName=site_name)
                if currentACL['admin'] != 1 and docker_site.admin != admin and docker_site.admin.owner != admin.pk:
                    return HttpResponse(json.dumps({
                        'status': 0,
                        'error_message': 'Not authorized to access this container'
                    }))
            except DockerSites.DoesNotExist:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': 'Docker site not found'
                }))

            docker_manager = DockerManager()
            container = docker_manager.get_container(container_id)
            
            if not container:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': 'Container not found'
                }))

            # Update n8n
            try:
                # Run npm update in the container
                exec_result = container.exec_run(
                    cmd="npm install -g n8n@latest",
                    workdir="/usr/local/lib/node_modules/n8n"
                )
                
                if exec_result.exit_code != 0:
                    return HttpResponse(json.dumps({
                        'status': 0,
                        'error_message': f'Update failed: {exec_result.output.decode()}'
                    }))

                # Get new version after update
                new_version = docker_manager.get_n8n_version(container)
                
                # Restart the container to apply changes
                container.restart()

                return HttpResponse(json.dumps({
                    'status': 1,
                    'message': 'n8n updated successfully',
                    'new_version': new_version
                }))

            except Exception as e:
                return HttpResponse(json.dumps({
                    'status': 0,
                    'error_message': f'Update failed: {str(e)}'
                }))

        return HttpResponse('Not allowed')
    except Exception as e:
        return HttpResponse(json.dumps({
            'status': 0,
            'error_message': str(e)
        }))