#!/usr/bin/env python3

import os
import sys
import argparse
import requests
import json
from dotenv import load_dotenv
from string import Template
from pathlib import Path

load_dotenv()

required_env_vars = {
    'PORTAINER': 'The portainer instance to deploy to',
    'API_KEY': 'API-Key to access portainer instance',
    'PORTAINER_EP': 'Portainer Environment EndPoint to deploy to',
    'DEPLOY_REPO_URL': 'The repository URL to deploy',
    'DEPLOY_REF': 'The git ref to deploy',
    'DEPLOY_HOST': 'The host name under which the deployment will be reachable',
    'DEPLOY_NAME': 'Custom name to use as the deployment name',
}

# Try getting all arguments from (in order): 1 command line, 2 .env file, 3 Environment
parser = argparse.ArgumentParser(description='Deploys a docker compose application to portainer.')

for var, usage in required_env_vars.items():
    parser.add_argument(f'--{var}', default=os.getenv(var, None), help=usage)
args = parser.parse_args()

# Check if all were parsed
not_parsed = []
for var, usage in required_env_vars.items():
    if not getattr(args, var):
        not_parsed.append(var)
    else:
        print(f'--{var}: {getattr(args, var)}')

if not_parsed:
    print(f"Error: The following required environment variables were not provided: {', '.join(not_parsed)}")
    parser.print_help()
    sys.exit(1)

portainer=args.PORTAINER
api_key=args.API_KEY
portainer_ep=args.PORTAINER_EP

# Deploy variables to substitute in portainer deploy template
deploy_variables = {key: getattr(args, key) for key in 
    ['DEPLOY_REPO_URL', 'DEPLOY_HOST', 'DEPLOY_NAME', 'DEPLOY_REF']
}

### Find CICD-runner portainer environment endpointId ###
headers = {
    'Content-Type': 'application/json',
    'X-API-Key': api_key,
}
url = f'{portainer}/api/endpoints'
json_endpoints = None
try:
    response = requests.get(url, headers=headers)
    response.raise_for_status()  # Raise HTTPError for bad requests
    json_endpoints = response.json()
    
except requests.exceptions.RequestException as err:
    raise Exception(f'Could not retrieve portainer endpoints: {err}')

endpoint_id = None
for endpoint in json_endpoints:
    if endpoint["Name"] == portainer_ep:
        endpoint_id = endpoint["Id"]
        break
if endpoint_id is None:
    raise Exception(f'Portainer endpoint \'{portainer_ep}\' not found.')
else:
    print(f'Found portainer endpoint \'{portainer_ep}\' has id: \'{endpoint_id}\'.')


### Template substitution for the portainer stack deployment ###
portainer_deploy_json = None
template_file = f'{Path( __file__ ).parent.absolute()}/portainer_deploy.template.json'
with open(template_file, 'r') as file:
    portainer_template = Template(file.read())

# Perform variable substitution
portainer_deploy_json = portainer_template.substitute(**deploy_variables)

### Deploy to portainer ###
headers = {
    'Content-Type': 'application/json',
    'X-API-Key': api_key,
}
url = f'{portainer}/api/stacks/create/standalone/repository?endpointId={endpoint_id}'
try:
    response = requests.post(url, headers=headers, json=json.loads(portainer_deploy_json))
    response.raise_for_status()  # Raise HTTPError for bad requests
    response_data = response.json()  # Parse response JSON

except requests.exceptions.RequestException as err:
    raise Exception(f'Could not deploy portainer stack: {err}')

print(f'Successfully deployed project')