#!/usr/bin/env python
"""Run Integ Tests based on the changed files

"""
from subprocess import call, check_call, Popen, PIPE

# Minimal modules to tests when core changes are detected.
# s3 - xml, dynamodb - json, sqs - query
core_modules_to_test = ["s3", "dynamodb", "sqs"]

# Minimal modules to tests when http client changes are detected.
# s3 - streaming/non streaming, kinesis - h2
http_modules_to_test = {
    "apache-client": ["s3", "apache-client"],
    "netty-nio-client": ["kinesis", "s3", "netty-nio-client"],
    "url-connection-client": ["url-connection-client"]
}

def check_diffs():
    """
    Retrieve the changed files
    """
    process = Popen(["git", "diff", "HEAD^", "--name-only"], stdout=PIPE)

    diff, stderr = process.communicate()

    if process.returncode !=0:
        raise Exception("Unable to do git diff")
    return diff.splitlines(False)

def get_modules(file_path):
    """
    Parse the changed file path and get the respective module names
    """
    path = file_path.split('/')

    # filter out non-java file
    if not path[-1].endswith(".java"):
        return

    top_directory = path[0]

    if top_directory in ["core", "codegen"]:
        return core_modules_to_test
    if top_directory in ["http-clients"]:
        return http_modules_to_test.get(path[1])
    elif top_directory== "services":
        return path[1]

def run_tests(modules):
    """
    Run integration tests for the given modules
    """
    print("Running integ tests in the following modules: " + ', '.join(modules))
    modules_to_include = ""

    for m in modules:
        modules_to_include += ":" + m + ","

    # remove last comma
    modules_to_include = modules_to_include[:-1]

    # build necessary dependencies first
    check_call(["mvn", "clean", "install", "-pl", modules_to_include, "-P", "quick", "--am"])
    check_call(["mvn", "verify", "-pl", modules_to_include, "-P", "integration-tests", "-Dfailsafe.rerunFailingTestsCount=1"])

if __name__ == "__main__":
    diffs = check_diffs()
    modules = set()
    for d in diffs:
        module = get_modules(d)
        if isinstance(module, list):
            modules.update(module)
        elif module:
            modules.add(module)

    if modules:
        run_tests(modules)
    else:
        print("No modules configured to run. Skipping integ tests")