import unittest
import sys
import os

import sys
import time
import json
import urllib
import urllib2
import subprocess
import signal
import random

sys.path.append("interface/HUTN")
sys.path.append("scripts")
from hutn_compiler.compiler import main as do_compile

taskname = "test_task"
INIT_TIMEOUT = 30

try:
    import pytest
    slow = pytest.mark.skipif(
        not pytest.config.getoption("--runslow"),
            reason="need --runslow option to run"
    )
except:
    slow = lambda i:i

ports = set()

def getFreePort():
    """Gets a unique new port."""
    while 1:
        port = random.randint(10000, 20000)
        # Check if this port is in the set of ports.
        if port not in ports:
            # We have found a unique port. Add it to the set and return.
            ports.add(port)
            return port

def execute(scriptname, parameters=[], wait=False):
    if os.name not in ["nt", "posix"]:
        # Stop now, as we would have no clue on how to kill its subtree
        raise Exception("Unknown OS version: " + str(os.name))

    command = [sys.executable, "-u", "scripts/%s.py" % scriptname] + parameters

    if wait:
        return subprocess.call(command, shell=False)
    else:
        return subprocess.Popen(command, shell=False, stdout=subprocess.PIPE)

def kill(process):
    if os.name == "nt":
        subprocess.call(["taskkill", "/F", "/T", "/PID", "%i" % process.pid])
    elif os.name == "posix":
        # Kill parents
        subprocess.call(["pkill", "-9", "-P", "%i" % process.pid])
        # Kill self
        subprocess.call(["kill", "-9", "%i" % process.pid])

def flush_data(address, data):
    if data:
        urllib2.urlopen(urllib2.Request(address, urllib.urlencode({"op": "set_input", "data": json.dumps(data), "taskname": taskname})), timeout=INIT_TIMEOUT).read()
    return []

def start_mvc():
    port = getFreePort()
    address = "http://127.0.0.1:%s" % port
    proc = execute("run_local_modelverse", [str(port)], wait=False)
    return proc, address

def get_constructor(code):
    code_fragments = code.split("\n")
    code_fragments = [i for i in code_fragments if i.strip() != ""]
    code_fragments = [i.replace("    ", "\t") for i in code_fragments]
    initial_tabs = min([len(i) - len(i.lstrip("\t")) for i in code_fragments])
    code_fragments = [i[initial_tabs:] for i in code_fragments]
    code_fragments.append("")
    code = "\n".join(code_fragments)

    with open("__constraint.alc", "w") as f:
        f.write(code)
        f.flush()

    constructors = do_compile("__constraint.alc", "interface/HUTN/grammars/actionlanguage.g", "CS")

    return constructors

def get_model_constructor(code):
    # First change multiple spaces to a tab
    code_fragments = code.split("\n")
    code_fragments = [i for i in code_fragments if i.strip() != ""]
    code_fragments = [i.replace("    ", "\t") for i in code_fragments]
    initial_tabs = min([len(i) - len(i.lstrip("\t")) for i in code_fragments])
    code_fragments = [i[initial_tabs:] for i in code_fragments]
    code_fragments.append("")
    code = "\n".join(code_fragments)

    with open("__model.mvc", "w") as f:
        f.write(code)
        f.flush()

    return get_model_constructor_2("__model.mvc")

def get_model_constructor_2(f):
    return do_compile(f, "interface/HUTN/grammars/modelling.g", "M") + ["exit"]