#!/usr/bin/env python3


import argparse
import fileinput
import glob
import os
import platform
import signal
import subprocess
import sys
import time



"""
*****************************************************************
******************** GENERAL CONSTANTS **************************
*****************************************************************
"""

DEBUG = False

PYROS_DJANGO_BASE_DIR = "src/core/pyros_django"

INIT_FIXTURE = "initial_fixture.json"

_previous_dir = None

AGENTS = {
    #"agentX" : "agent", 
    "agent" : "Agent", 
    "agentX" : "AgentX", 
    "agentA" : "AgentA", 
    "agentB" : "AgentB", 
    "agentM" : "AgentM", 
    #"agentDevice" : "AgentDevice", 
    #"agentDeviceTelescopeGemini" : "AgentDeviceTelescopeGemini",
    "agentDeviceGemini" : "AgentDeviceGemini",
    "agentDeviceSBIG" : "AgentDeviceSBIG",
    "agentTelescopeRequester" : "AgentTelescopeRequester", 
    "agentMultiRequester" : "AgentMultiRequester", 
    "webserver" : "webserver", 
    "monitoring" : "monitoring", 
    "majordome" : "majordome", 
    "scheduler" : "scheduler", 
    "alert_manager" : "alert_manager"
}
#AGENTS = ["agentX", "webserver", "monitoring", "majordome", "scheduler", "alert_manager"]
#AGENTS = ["all", "webserver", "monitoring", "majordome", "scheduler", "alert"]

#COMMANDS = {"install": [], "start": AGENTS, "stop": AGENTS}

REQUIREMENTS = 'REQUIREMENTS.txt'
b_in_dir = "bin"
PYTHON = "python3"
# should also be ok from venv:
#PYTHON = "python"

IS_WINDOWS = platform.system() == "Windows"
if IS_WINDOWS:
    REQUIREMENTS = 'REQUIREMENTS_WINDOWS.txt'
    b_in_dir = "Scripts"
    PYTHON = "python.exe"

my_abs_path = os.path.dirname(os.path.realpath(__file__))
VENV_BIN = (
    my_abs_path
    + os.sep + "venv"
    + os.sep + "venv_py3_pyros"
    + os.sep + b_in_dir
    + os.sep + PYTHON
)

class Colors:
    HEADER = "\033[95m"
    BLUE = "\033[94m"
    GREEN = "\033[92m"
    WARNING = "\033[93m"
    FAIL = "\033[91m"
    ENDC = "\033[0m"
    BOLD = "\033[1m"
    UNDERLINE = "\033[4m"




# First, install the click package !!!
#import fire
try:
    import click # https://click.palletsprojects.com
except:
    #pip = "pip" if platform.system() == "Windows" else "pip3"
    # TODO: "python -m pip" au lieu de "pip"
    pip = "pip" if IS_WINDOWS else "pip3"
    process = subprocess.Popen(pip + " install --upgrade click", shell=True)
    process.wait()
    if process.returncode == 0:
        print("click package installation successfull")
        # self.addExecuted(self.current_command, command)
        import click
    else:
        print("click package installation failed")
        # self.addError(self.current_command, command)
        
    




"""
**************************************************************************
******************** GENERAL AND UTIL FUNCTIONS **************************
**************************************************************************
"""

def _in_dir(dirname: str = ""):
    return os.path.basename(os.getcwd()) == dirname


def _in_abs_dir(dirname: str = ""):
    return os.getcwd() == dirname


def die(msg: str = ""):
    print()
    print("...ERROR...")
    print(msg)
    print()
    exit(1)
    

#TODO: implement is_async
def execProcess(command, from_venv=False, is_async=False):
    from_venv_str = " from venv ("+VENV_BIN+")" if from_venv else ""
    #printFullTerm(Colors.BLUE, "Executing command" + " [" + command + "]" + from_venv_str)
    print("Executing command" + " [" + command + "]" + from_venv_str)
    if from_venv: command = VENV_BIN+' ' + command
    process = subprocess.Popen(command, shell=True)
    if is_async:
        #current_processes.append(process)
        return process
    # Not is_async => Wait for end of execution
    process.wait()
    if process.returncode == 0:
        printFullTerm(Colors.GREEN, "Process executed successfully")
        # self.addExecuted(self.current_command, command)
    else:
        printFullTerm(Colors.WARNING, "Process execution failed")
        # self.addError(self.current_command, command)
    #return process.returncode
    return True if process.returncode==0 else False

def execProcessFromVenv(command:str, is_async=False):
    #return execProcess(command, from_venv=True, is_async)
    return execProcess(command, True, is_async)

#TODO: fusionner dans execProcess avec param is_async
def execProcessFromVenvAsync(command:str):
    return execProcessFromVenv(command, True)
    """
    args = command.split()
    printFullTerm(
        Colors.BLUE, "Executing command from venv [" + str(" ".join(args[1:])) + "]"
    )
    p = subprocess.Popen(args)
    subproc.append((p, " ".join(args[1:])))
    printFullTerm(Colors.GREEN, "Process launched successfully")
    # self.addExecuted(self.current_command, str(' '.join(args[1:])))
    # p.wait()
    return p
    """

def printColor(color: Colors, message, file=sys.stdout, eol=os.linesep, forced=False):
    #system = platform.system()
    """
    if (self.disp == False and forced == False):
        return 0
    """
    #if system == "Windows":
    if IS_WINDOWS:
        print(message, file=file, end=eol)
    else:
        print(color + message + Colors.ENDC, file=file, end=eol)
    return 0


def printFullTerm(color: Colors, string: str):
    #system = platform.system()
    columns = 100
    row = 1000
    disp = True
    value = int(columns / 2 - len(string) / 2)
    printColor(color, "-" * value, eol="")
    printColor(color, string, eol="")
    value += len(string)
    printColor(color, "-" * (columns - value))
    return 0





"""
********************************************************************************
******************** CLI COMMANDS DEFINITION (click format) ********************
********************************************************************************
"""

'''
_global_test_options = [
    click.option('--test', '-t', is_flag=True, help="don't do it for real, just show what it would do"),
    click.option('--verbose', '-v', 'verbosity', flag_value=2, default=1, help='Verbose output'),
    click.option('--quiet', '-q', 'verbosity', flag_value=0, help='Minimal output'),
    #click.option('--fail-fast', '--failfast', '-f', 'fail_fast', is_flag=True, default=False, help='Stop on failure'),
]
def global_test_options(func):
    for option in reversed(_global_test_options):
        func = option(func)
    return func
'''

GLOBAL_OPTIONS = {}
def verbose_mode(): return GLOBAL_OPTIONS["verbose"]
def test_mode(): return GLOBAL_OPTIONS["test"]
def sim_mode(): return GLOBAL_OPTIONS["sim"]

@click.group()
@click.option('--test', '-t', is_flag=True, help="don't do it for real, just show what it would do")
@click.option('--sim', '-s', is_flag=True, help="only for an AgentDevice, asking it to start its simulator and work with it (instead of real device)")
@click.option('--verbose', '-v', is_flag=True, help='Verbose output')
#@click.option('--verbose', '-v', 'verbosity', flag_value=2, default=1, help='Verbose output'),
#@click.option('--quiet', '-q', 'verbosity', flag_value=0, help='Minimal output'),
#@click.option('--fail-fast', '--failfast', '-f', 'fail_fast', is_flag=True, default=False, help='Stop on failure'),
def pyros_launcher(test, sim, verbose):
    #pass
    if test: click.echo('Test mode')
    if test: click.echo('Starting and connecting to simulator instead of real device')
    if verbose: click.echo('Verbose mode')
    GLOBAL_OPTIONS["test"] = test
    GLOBAL_OPTIONS["sim"] = sim
    GLOBAL_OPTIONS["verbose"] = verbose



@pyros_launcher.command(help="Run a pyros shell (django included)")
#@global_test_options
def shell():
    print()
    print("Launching a pyros shell")
    print()
    print("NB1: If you want to play with an agent, type:")
    print("    >>> from agent.AgentA import AgentA")
    print("    >>> agent=AgentA('agent_toto')")
    print("    >>> agent")
    print("    >>> agent.run(2) (=> will run 2 iterations)")
    print("    >>> cmd = agent.send_command('AgentB','eval 2+2')")
    print("    >>> cmd")
    print("    >>> cmd.get_updated_result()")
    print("    >>> ...")
    print("    - See documentation, section 'Play with a pyros agent' inside the chapter 'Running pyros' for more details")
    print()
    print("NB2: If you want to play with the pyros objects, type:")
    print("    >>> from common.models import *")
    print("    - (This will import all the pyros objects)")
    print("    - Then, you can create any pyros object just by typing its name.")
    print("    - For example, to create an AgentSurvey object, type:")
    print("    >>> agent_survey = AgentSurvey()")
    print("    >>> agent_survey")
    print("    >>> ...")
    print("    - See documentation, section 'Play with the pyros objects' inside the chapter 'Running pyros' for more details")
    print()
    print("Type 'exit()' to quit")
    print()
    change_dir(PYROS_DJANGO_BASE_DIR)

    # execProcess("python install.py install")
    if not test_mode(): execProcessFromVenv("manage.py shell")
    # Go back to the initial dir
    #os.chdir("../")
    change_dir("PREVIOUS")
    return True


@pyros_launcher.command(help="Run a database (Mysql) shell")
def dbshell():
    print()
    print("Launching a database (mysql) shell")
    print("From this shell, you can type 'show tables;' to see all the pyros tables")
    print("Then for example, type 'select * from config;' to see the content of the 'config' table")
    print("Type 'exit' to quit")
    print()
    # execProcess("python install.py install")
    if not test_mode(): execProcessFromVenv(PYROS_DJANGO_BASE_DIR+"/manage.py dbshell")
    # Go back to the initial dir
    return True


@pyros_launcher.command(help="Install the pyros software")
@click.option('--packages_only', '-p', is_flag=True, help='install only the python packages (no database installation)')
@click.option('--database_only', '-d', is_flag=True, help='install only the pyros database (no python packages installation)')
#@global_test_options
def install(packages_only, database_only):
    print("Running install command")
    print("packages_only", packages_only)
    print("database_only", database_only)
    #if test_mode(): print("in test mode")
    # self.execProcess("python3 install/install.py install")
    # if (os.path.basename(os.getcwd()) != "private"):
    start_dir = os.getcwd()
    os.chdir("install/") ; _in_dir("install") or die("Bad dir")
    # execProcess("python install.py install")
    option=''
    if packages_only: option='-p'
    if database_only: option='-d'
    test_mode() or execProcess(PYTHON + " install.py " + option)
    # cd -
    # os.chdir("-")
    os.chdir(start_dir) ; _in_abs_dir(start_dir) or die("Bad dir")
    # return 0
    return True



@pyros_launcher.command(help="Run some tests")
def test():
    print("Running tests")
    #start_dir = os.getcwd()
    apps = ['common', 'scheduler', 'routine_manager', 'user_manager', 'alert_manager.tests.TestStrategyChange']
    for app in apps:
        _loaddata() or die()
        change_dir(PYROS_DJANGO_BASE_DIR)
        # Delete test_pyros database after tests
        #execProcessFromVenv('manage.py test ' + app) or die()
        # KEEP test_pyros database after tests
        execProcessFromVenv('manage.py test --keep ' + app) or die()
        change_dir("PREVIOUS")
    # execProcess("python install.py install")
    return True

@pyros_launcher.command(help="Run ALL tests")
def testall():
    change_dir(PYROS_DJANGO_BASE_DIR)
    # Delete test_pyros database after tests
    # execProcessFromVenvAsync("manage.py test")
    # KEEP test_pyros database after tests
    execProcessFromVenvAsync("manage.py test --keep")
    change_dir("PREVIOUS")
    return True



    
'''
TODO:
'''
@pyros_launcher.command(help="Update (only if necessary) the python packages AND the source code AND the DB structure")
def update():
    print("Running update command")

    # 1) Update source code (git pull)
    printFullTerm(Colors.BLUE, "1) UPDATING SOURCE CODE: Running git pull")
    _gitpull() or die()
    
    # 2) Update python packages (pip install requirements)
    printFullTerm(Colors.BLUE, "2) UPDATING PYTHON PACKAGES")
    _update_python_packages_from_requirements() or die()
    
    # 3) Update PlantUML diagrams
    printFullTerm(Colors.BLUE, "3) UPDATING PLANTUML DIAGRAMS")
    _update_plantuml_diags() or die()
    
    # 4) Update database structure (make migrations + migrate)
    printFullTerm(Colors.BLUE, "4) UPDATING DATABASE")
    _updatedb() or die()
    return True


def _gitpull():
    print("-- running git pull")
    GIT = "git.exe" if IS_WINDOWS else "git"
    if not test_mode(): return execProcess(f"{GIT} pull")
    return True

#@pyros_launcher.command(help="Update the pyros database")
def _updatedb():
    print("-- update db (make migrations + migrate)")
    if not test_mode() :
        _makemigrations() or die()
        _migrate() or die()
    return True


@pyros_launcher.command(help="Update the pyros database and fill it with initial fixture data")
def initdb():
    if not test_mode():
        #updatedb()
        _makemigrations()
        _migrate()
        _loaddata()
    return True



@pyros_launcher.command(help="Launch an agent")
#@global_test_options
@click.argument('agent')
@click.option('--configfile', '-c', help='the configuration file to be used')
#@click.option('--format', '-f', type=click.Choice(['html', 'xml', 'text']), default='html', show_default=True)
#@click.option('--port', default=8000)
#def start(agent:str, configfile:str, test, verbosity):
def start(agent:str, configfile:str):
    print("Running start command")
    if configfile: 
        print("With config file", configfile)
    else: 
        configfile = ''
    #if test_mode(): print("in test mode")
    #if verbose_mode(): print("in verbose mode")

    # Check each agent in the given list    
    agents = agent.split(",") if "," in agent else [agent]
    for a in agents: 
        if not _check_agent(a): return
    #print("Agents are:", agents)
    '''
    # Check if multiple agents:
    agents = None
    if "," in agent:
        agents = agent.split(",")
        for a in agents: 
            if not _check_agent(a): return
        print("Agents are:", agents)
    # 1 agent only
    else:
        agents = [agent]
        if not _check_agent(agent): return
    '''
    
    # Start Agents (processes)
    current_processes = []
    for agent_name,agent_folder in AGENTS.items():

        #if agent in ("all", agent_name) :
        if agent=="all" or agent_name in agents:
            # Default case, launch agentX
            #if agent_name == "agentX":

            # execProcessFromVenvAsync(VENV_BIN + " manage.py runserver")
            print(VENV_BIN)
            print("Launching agent", agent_name, "...")
            #if not test_mode(): execProcess(VENV_BIN + " manage.py runserver")
            #if not test_mode(): execProcessFromVenv("start_agent_" + agent_name + ".py " + configfile)
            
            current_dir = os.getcwd()

            # OLD format agents: majordome, monitoring, alert...
            cmd = "start_agent.py " + agent_name + " " + configfile
            
            # Agent "webserver"
            if agent_name == "webserver": 
                cmd = "manage.py runserver"
                os.chdir(PYROS_DJANGO_BASE_DIR)
            #if not test_mode(): execProcessFromVenv("start_agent.py " + agent_name + " " + configfile)

            # Agent "agentM", "agentA", "agentB", "agentX", ...            
            elif agent_name.startswith("agent"):
                # Run agent without actual commands sent to devices (FOR_REAL=False)
                ##agentX.run(FOR_REAL=True)
                if agent_name == "agentM": 
                    os.chdir(PYROS_DJANGO_BASE_DIR+"/monitoring/")
                else:
                    os.chdir(PYROS_DJANGO_BASE_DIR+"/agent/")
                #cmd = "-m AgentX"
                #cmd = f" Agent{agent_name[5:]}.py {configfile}"
                cmd = f"Agent{agent_name[5:]}.py"
                if test_mode(): cmd += " -t"
                if sim_mode(): cmd += " -s"
                if configfile: cmd += " {configfile}"
                
            #if not test_mode(): current_processes.append( [execProcessFromVenvAsync(cmd), agent_name, -1] )
            # Append this process ( [process id, agent_name, result=failure] )
            # ("result" will be updated at the end of execution)
            current_processes.append( [execProcessFromVenvAsync(cmd), agent_name, -1] )
            # self.change_dir("..")
            os.chdir(current_dir)

    # Go back to root folder (/)
    # self.change_dir('..')
    #os.chdir("..")
    # Wait for end of each process execution
    #for (p,agent) in current_processes:
    for process in current_processes:
        p,agent,_ = process
        print(f"************ Waiting for end of execution of agent {agent} ************")
        p.wait()
        process[2] = p.returncode
        print(f"************ END of execution of agent {agent} ************")
        if p.returncode == 0:
            printFullTerm(Colors.GREEN, f"Process {agent} executed successfully")
            # self.addExecuted(self.current_command, command)
        else:
            printFullTerm(Colors.WARNING, f"Process {agent} execution failed")
            # self.addError(self.current_command, command)
    
    print()
    print()
    print("Synthesis of the results:")
    for process in current_processes:
        p,agent,returncode = process
        if returncode == 0:
            printFullTerm(Colors.GREEN, f"Process {agent} executed successfully")
            # self.addExecuted(self.current_command, command)
        else:
            printFullTerm(Colors.WARNING, f"Process {agent} execution failed")
            # self.addError(self.current_command, command)
        
    #print("************ end of START() ************")
    # Only according to the last process status:
    #return True if p.returncode==0 else False
    return True if p.returncode==0 else False


@pyros_launcher.command(help="Kill an agent")
@click.argument('agent')
def stop(agent):
    print("Running stop command")
    if not _check_agent(agent): return



"""
********************************************************************************
******************** PRIVATE FUNCTIONS DEFINITION ******************************
********************************************************************************
"""

def _update_python_packages_from_requirements():
    # 1) try to upgrade pip
    res = execProcessFromVenv("-m pip install --upgrade pip")
    if not res: return False
    # 2) install only "not yet installed" python packages
    res = execProcessFromVenv("-m pip install -r install/"+REQUIREMENTS)
    return res

def _update_plantuml_diags():
    for dirpath, dirnames, files in os.walk(PYROS_DJANGO_BASE_DIR):
        if os.path.basename(dirpath) == "doc":
            diagrams = glob.glob(dirpath+os.sep+"*.pu")
            # For each diagram source file (.pu), generate the diagram PNG file (only if CHANGED)
            for diag in diagrams:
                # if no diag.png or if diag.pu more recent than diag.png => re-generate diag.png
                diag_png = diag.split('.pu')[0] + '.png'
                if not os.path.isfile(diag_png) or ( os.path.getmtime(diag) > os.path.getmtime(diag_png) ) :
                    res = execProcessFromVenv("-m plantuml "+diag)
                    if not res: return False
    return True

def _migrate():
    change_dir(PYROS_DJANGO_BASE_DIR)
    # Migrate only migrations for the app "common"
    #res = execProcessFromVenv("manage.py migrate common")
    # Migrate all migrations for ALL apps
    res = execProcessFromVenv("manage.py migrate")
    change_dir("PREVIOUS")
    return res

def _makemigrations():
    change_dir(PYROS_DJANGO_BASE_DIR)
    #execProcessFromVenv(self.venv_bin + " manage.py makemigrations")
    #res = execProcessFromVenv("manage.py makemigrations common")
    res = execProcessFromVenv("manage.py makemigrations")
    change_dir("PREVIOUS")
    return res

#TODO: mettre la fixture en date naive (sans time zone)
def _loaddata():
    change_dir(PYROS_DJANGO_BASE_DIR)
    #execProcessFromVenv(self.venv_bin + " manage.py loaddata misc" + os.sep + "fixtures" + os.sep + self.INIT_FIXTURE)
    res = execProcessFromVenv("manage.py loaddata misc" + os.sep + "fixtures" + os.sep + INIT_FIXTURE)
    change_dir("PREVIOUS")
    return res


def change_dir(path):
    global _previous_dir
    if path == "PREVIOUS": path=_previous_dir
    _previous_dir = os.getcwd()
    if DEBUG: print("Moving to : " + path)
    os.chdir(path)
    if DEBUG: print("Current directory : " + str(os.getcwd()))



def _check_agent(agent):
    # Check that agent exists
    if agent != "all" and agent not in AGENTS.keys() :
        # Check if multiple agents:
        print("This agent does not exist")
        print("Here is the allowed list of agents:")
        print("- all => will launch ALL agents")
        for agent_name in AGENTS.keys(): print('-',agent_name)
        return False
    return True



"""
********************************************************************************
********************************* main() FUNCTION ******************************
********************************************************************************
"""
def main():
    pyros_launcher()
    
    
# AVIRER
#@click.command()
#@click.argument('start')
def oldmain():
    '''
    cli()
    return
    '''
    
    #fire.Fire(Commands)
    #return

    # if len(sys.argv) == 3 and sys.argv[1].startswith("simulator"): SIMULATOR_CONFIG_FILE = sys.argv[2]
    # print(sys.argv)
    """
    system = platform.system()
    columns = 100
    row = 1000
    disp = True
    """

    # Read command
    if len(sys.argv) <= 1:
        die("You must give a command name")
    command = sys.argv[1]
    if not command in COMMANDS.keys():
        die("This command does not exist")
    command_all_args = COMMANDS[command]

    # Read command args if should be
    command_arg = None
    if command_all_args:
        if len(sys.argv) <= 2:
            die("This command should be given an argument")
        command_arg = sys.argv[2]
        if not command_arg in command_all_args:
            die("This argument does not exist for command " + command)

    print("Executing command", command)
    if command_arg:
        print("with arg", command_arg)

    # command(command_arg)
    if command_arg:
        globals()[command](command_arg)
    else:
        globals()[command]()
    # sys.exit(pyros.exec())



if __name__ == "__main__": main()