# -*- coding: utf-8 -*-

import os

from signal import SIGTERM, SIGSTOP, SIGCONT
from enum import Enum

from Model.Except import NotImplementedMethodeError

class STATUS(Enum):
    NOT_LAUNCHED = -1
    STOPED = 0
    RUNNING = 1
    PAUSED = 5

class AbstractSolver(object):
    def __init__(self, name):
        super(AbstractSolver, self).__init__()

        self._current_process = None
        self._status = STATUS.NOT_LAUNCHED

        # Informations
        self._type = ""
        self._name = name
        self._description = ""

        self._path_input = ""
        self._path_solver = ""
        self._path_output = ""

        self._cmd_input = ""
        self._cmd_solver = ""
        self._cmd_output = ""

        self._process = None
        self._output = None

    def __str__(self):
        return f"{self._name} : {self._type} : {self._description}"

    def __getitem__(self, key):
        ret = None
        if key == "name":
            ret = self._name
        elif key == "description":
            ret = self._description
        elif key == "type":
            ret = self._type
        return ret

    @classmethod
    def default_parameters(cls):
        lst = [
            ("all_init_time", "00:00:00:00"),
            ("all_final_time", "999:99:00:00"),
            ("all_timestep", "300.0"),
        ]

        return lst

    @classmethod
    def checkers(cls):
        lst = [
        ]

        return lst

    @property
    def name(self):
        return self._name

    @property
    def description(self):
        return self._description

    @property
    def status(self):
        return self._status

    @property
    def type(self):
        return self._type

    @status.setter
    def status(self, status):
        self._status = status

    def is_running(self):
        return self._status == STATUS.RUNNING

    def is_paused(self):
        return self._status == STATUS.PAUSED

    def is_stoped(self):
        return self._status == STATUS.STOPED

    @name.setter
    def name(self, name):
        self._name = name

    @description.setter
    def description(self, description):
        self._description = description

    def set_input(self, path, cmd):
        self._path_input = path
        self._cmd_input = cmd

    def set_solver(self, path, cmd):
        self._path_solver = path
        self._cmd_solver = cmd

    def set_output(self, path, cmd):
        self._path_output = path
        self._cmd_output = cmd

    ##########
    # Export #
    ##########

    def export(self, study, repertory, qlog = None):
        raise NotImplementedMethodeError(self, self.export)

    #######
    # Run #
    #######

    def run_input_data_fomater(self):
        if self._cmd_input == "":
            return True

        return False

    def run_solver(self):
        if self._cmd_solver == "":
            return True

        cmd = self._cmd_solver
        cmd = cmd.replace("@path", self._path_solver).split()

        exe = cmd[0]
        args = cmd[1:]

        self._process.start(
            exe, args,
        )
        self._process.readyRead.connect(self._data_ready)
        self._process.finished.connect(self._finished)

        self._status = STATUS.RUNNING
        return True

    def run_output_data_fomater(self):
        if self._cmd_output == "":
            return True

        return False

    def _data_ready(self):
        s = self._process.readAll().data().decode()
        if self._output is not None:
            self._output.put(s)

    def _finished(self, exit_code, exit_status):
        if self._output is not None:
            self._output.put(exit_code)
        self._status = STATUS.STOPED

    def run(self, process, output_queue):
        self._process = process
        self._output = output_queue

        if self.run_input_data_fomater():
            if self.run_solver():
                return self.run_output_data_fomater()

    def kill(self):
        if self._process is None:
            return True

        self._process.kill()
        self._status = STATUS.STOPED
        return True

    def start(self, process = None):
        if process is not None:
            self._process = process

        if self._status == STATUS.PAUSED:
            os.kill(self._process.pid(), SIGCONT)
            self._status = STATUS.RUNNING
        else:
            self.run_solver()

        return True

    def pause(self):
        if self._process is None:
            return False

        os.kill(self._process.pid(), SIGSTOP)
        self._status = STATUS.PAUSED
        return True

    def stop(self):
        if self._process is None:
            return False

        self._process.terminate()
        self._status = STATUS.STOPED
        return True


    def wait(self):
        if self._process is None:
            return False

        self._process.wait()
        self._status = STATUS.STOPED
        return True