#!/usr/bin/env python

import json
import os
import string

MAPPING_FILE_NAME = 'serviceMapping.vm'
RESOURCES_ROOT_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)))
ARCHETYPE_LAMBDA_ROOT_DIR = os.path.dirname(os.path.dirname(os.path.abspath(os.path.join(RESOURCES_ROOT_DIR, "../"))))
SERVICE_DIR = os.path.join(
    os.path.dirname(os.path.dirname(os.path.abspath(os.path.join(__file__, "../../../../")))),
    'services'
)

def load_all_service_modules():
    service_mapping = {}
    for f in [f for f in os.listdir(SERVICE_DIR) if os.path.isdir(os.path.join(SERVICE_DIR, f)) & os.path.exists(os.path.join(SERVICE_DIR, f, 'target'))]:
        for s in [s for s in os.listdir(os.path.join(SERVICE_DIR, f, 'target', 'generated-sources/sdk/software/amazon/awssdk/services', f)) if s.endswith('AsyncClient.java') & s.startswith('Default')]:
            service_mapping[f] = find_client_prefix(s)
    return service_mapping

def find_client_prefix(d):
    index = d.find('AsyncClient.java')
    return d[7:index]

def write_to_vm_file(service_mapping):
    target = os.path.join(ARCHETYPE_LAMBDA_ROOT_DIR, 'target')

    if not os.path.exists(target):
        os.mkdir(target)

    target = os.path.join(ARCHETYPE_LAMBDA_ROOT_DIR, 'target', 'classes')

    if not os.path.exists(target):
        os.mkdir(target)

    filename = os.path.join(target, MAPPING_FILE_NAME)

    with open(filename, 'w') as f:
        f.write('#set ( $serviceMapping =')
        f.write(json.dumps(service_mapping))
        f.write(')')
    return filename

def main():
    service_mapping = load_all_service_modules()
    write_to_vm_file(service_mapping)

if __name__ == '__main__':
    main()