#!/usr/bin/env python3

# This is the entry point of the Verificarlo CI command line interface, which is
# based on argparse and this article :
# https://mike.depalatis.net/blog/simplifying-argparse.html
# From here, 3 subcommands can be called :
# - setup : create a vfc_ci branch and workflow on the current Git repo
# - test : run and export test results according to the vfc_tests_config.json
# - serve : launch a Bokeh server to visualize run results

import argparse

##########################################################################

# Parameters validation helpers


def is_port(string):
    value = int(string)
    if value < 0 or value > 65535:
        raise argparse.ArgumentTypeError("Value has to be between 0 and 65535")
    return value


def is_directory(string):
    import os

    isdir = os.path.isdir(string)
    if not isdir:
        raise argparse.ArgumentTypeError("Directory does not exist")

    return string


##########################################################################

    # Subcommand decorator

cli = argparse.ArgumentParser(
    description="Define, run, automatize, and visualize custom Verificarlo tests."
)
subparsers = cli.add_subparsers(dest="subcommand")


def subcommand(description="", args=[], parent=subparsers):
    def decorator(func):
        parser = parent.add_parser(func.__name__, description=description)
        for arg in args:
            parser.add_argument(*arg[0], **arg[1])
        parser.set_defaults(func=func)
    return decorator


def argument(*name_or_flags, **kwargs):
    return ([*name_or_flags], kwargs)


##########################################################################

    # "setup" subcommand

@subcommand(
    description="Create an automated workflow to execute Verificarlo tests.",
    args=[
        argument(
            "git_host",
            help="""
            specify where your repository is hosted
            """,
            choices=["github", "gitlab"]
        )
    ]
)
def setup(args):
    import ci.setup
    ci.setup.setup(args.git_host)

    # "test" subcommand


@subcommand(
    description="Execute predefined Verificarlo tests and save their results.",
    args=[
        argument(
            "-g", "--is-git-commit",
            help="""
            When specified, the last Git commit of the local repository (working
            directory) will be fetched and associated with the run.
            """,
            action="store_true"
        ),
        argument(
            "-r", "--export-raw-results",
            help="""
            Specify if an additional HDF5 file containing the raw results must be
            exported.
            """,
            action="store_true"
        ),
        argument(
            "-d", "--dry-run",
            help="""
            Perform a dry run by not saving the test results.
            """,
            action="store_true"
        )
    ]
)
def test(args):
    import ci.test
    ci.test.run(args.is_git_commit, args.export_raw_results, args.dry_run)

    # "serve" subcommand


@subcommand(
    description="""
    Start a server to visualize Verificarlo test results.
    """,
    args=[
        argument(
            "-s", "--show",
            help="""
            Specify if the report must be opened in the browser at server
            startup.
            """,
            action="store_true"
        ),
        argument(
            "-gd", "--git-directory",
            help="""
            Path to a local Git repository. The report will be linked to the
            remote URL (GitHub and GitLab are supported).
            """,
            type=is_directory
        ),
        argument(
            "-gu", "--git-url",
            help="""
            GitHub or GitLab repository URL. The report will be linked to this
            URL.
            """,
            type=str
        ),
        argument(
            "-p", "--port",
            help="""
            The port on which the server will run. Defaults to 8080.
            """,
            type=is_port,
            default=8080
        ),
        argument(
            "-a", "--allow-origin",
            help="""
            The origin (URL) from which the report will be accessible.
            Port number must not be specified. Defaults to * (allow everything).
            """,
            type=str,
            default="*"
        ),
        argument(
            "-l", "--logo",
            help="""
            Specify the URL of an image to be displayed in the report header.
            """,
            type=str
        )
    ]
)
def serve(args):

    # git_directory and git_url are supposed to be exclusive
    if args.git_directory is not None and args.git_url is not None:
        raise argparse.ArgumentTypeError(
            "\"-gd\" / \"--git-directory\" and \"-gu\" / \"--git-url\" are "
            "mutually exclusive. Please make sure to use at most one of them."
        )

    import ci.serve
    ci.serve.serve(
        args.show,
        args.git_directory,
        args.git_url,
        args.port,
        args.allow_origin,
        args.logo
    )


###############################################################################

    # Main command group and entry point
if __name__ == "__main__":
    args = cli.parse_args()
    if args.subcommand is None:
        cli.print_help()
    else:
        args.func(args)