"""Launcher for Propeller GP runs on the Hampshire College Fly cluster.

Setup
=====

1. Get access to an account on the Fly cluster.
2. SSH into the Fly cluster.
3. Clone `propeller` (probably your personal fork) in your user directory.
4. Make sure that your have Python 3.6 or later on your path.
5. Run `/share/apps/bin/lein --version` to do a 1-time setup of Leiningen.

How To Run
==========

1. Put your version of Propeller on the correct version you would like to run. For example, checkout your
feature branch.

2. Run this this script with Python 3 with `python3 scripts/fly_launcher [PARAMS]`.

Parameters
==========

-h, --help                           show this help message and exit
-n NUM_RUNS, --num-runs NUM_RUNS     The number of runs of the problem to start.
-o OUT, --out OUT                    The path to put the log files of the run captured from stdout.
-p PROBLEM, --problem PROBLEM        The namespaces of the problem file in the propeller repository.
-d PROPELLER, --propeller PROPELLER  The path to propeller.
-i ID, --id ID                       The identifier for the overall flight of propeller runs.
-t TAG, --tag TAG                    An optional tag to add to the runs.

or run `python3 scripts/fly_launcher.py -h` for help.

Example
=======

python3 fly_launcher.py \
    --num-runs 10 \
    --out "~/runs/propeller/my-experiment/" \
    --problem "propeller.problems.simple-regression" \
    --propeller "~/propeller" \
    --id my-gp-experiment

"""

# @todo Add support for n runs of a set of problems?

import argparse
import os
import subprocess


def alf_cmd(opts: argparse.Namespace, run_id: int) -> str:
    log_file = os.path.join(opts.out, f"run{run_id}.txt")
    cmds = [
        "echo Starting run",
        "export PATH=$PATH:/usr/java/latest/bin",
        f"cd {opts.propeller}",
        f"mkdir -p {opts.out}",
        f"/share/apps/bin/lein with-profiles production trampoline run -m {opts.problem} > {log_file}",
        "echo Finished Run"
    ]
    return f"""RemoteCmd {{/bin/sh -c {{{"; ".join(cmds)}}}}}"""


def alf_task(opts: argparse.Namespace, run_id: int) -> str:
    title = f"Run {run_id} - {opts.problem} - {opts.id}"
    return f"""Task -title {{{title}}} -cmds {{
        {alf_cmd(opts, run_id)} -service {{tom}} -tags {{{opts.tag}}}
    }}
"""


def alf_job(opts: argparse.Namespace) -> str:
    tasks = "\n    ".join([alf_task(opts, i) for i in range(opts.num_runs)])
    return f"""##AlfredToDo 3.0
Job -title {{{opts.id}}} -subtasks {{
    {tasks}
}}
"""


def cli_opts() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser()
    parser.add_argument("-n", "--num-runs", type=int, help="The number of runs of the problem to start.")
    parser.add_argument("-o", "--out", help="The path to put the log files of the run captured from stdout.")
    parser.add_argument("-p", "--problem", help="The namespaces of the problem file in the propeller repository.")
    parser.add_argument("-d", "--propeller", help="The path to propeller.")
    parser.add_argument("-i", "--id", help="The identifier for the overall flight of propeller runs.")
    parser.add_argument("-t", "--tag", default="", help="An optional tag to add to the runs.")
    return parser


PIXAR_INIT = "source /etc/sysconfig/pixar"
PIXAR_CMD = "/opt/pixar/tractor-blade-1.7.2/python/bin/python2.6 /opt/pixar/tractor-blade-1.7.2/tractor-spool.py --engine=fly:8000"


if __name__ == "__main__":
    cli_parser = cli_opts()
    args = cli_parser.parse_args()

    args.out = os.path.abspath(os.path.expanduser(args.out))
    args.propeller = os.path.abspath(os.path.expanduser(args.propeller))

    if not os.path.isdir(args.propeller):
        raise ValueError(f"Propeller not found at {args.propeller}")

    if not os.path.isdir(args.out):
        os.makedirs(args.out)

    alf_file = os.path.join(args.out, "propeller_runs.alf")
    with open(alf_file, "w") as alf:
        alf.write(alf_job(args))

    ret = subprocess.run(
        f"{PIXAR_INIT};{PIXAR_CMD} {alf_file}",
        shell=True
    )