#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import argparse
import os
import re
import subprocess
import logging
import sys
import yaml
import shutil

from pathlib import Path

import utilities
import speciesData


""" 
gga_init.py

Usage: $ python3 gga_init.py -i example.yml [OPTIONS]

"""


class DeploySpeciesStack(speciesData.SpeciesData):
    """
    Child of SpeciesData

    Contains methods and attributes to deploy a stack of services for a given organism, from creating/updating
    the organism's directory tree to create the required docker-compose files
    """


    def make_directory_tree(self):
        """
        Generate the directory tree for an organism and move datasets into src_data

        :return:
        """

        os.chdir(self.main_dir)

        try:
            os.mkdir(self.species_dir)
            logging.info("Making directory tree for %s" % self.full_name)
        except FileExistsError:
            logging.info("Updating directory tree for %s" % self.full_name)
        try:
            os.chdir(self.species_dir)
            working_dir = os.getcwd()
        except OSError:
            logging.critical("Cannot access " + self.species_dir + ", run with higher privileges")
            sys.exit()

        # Copy the custom banner to the species dir (banner used in tripal pages)
        # To change the banner, replace the "banner.png" file in the "misc" folder of the archive
        if not os.path.isfile("%s/banner.png" % self.species_dir):
            shutil.copy("%s/misc/banner.png" % self.script_dir, "%s/banner.png" % self.species_dir)

        # TODO: replace custom_theme in the compose !!
        try:
            os.mkdir("./nginx/")
            os.mkdir("./nginx/conf")
            with open(os.path.abspath("./nginx/conf/default.conf"), 'w') as conf:
                conf.write("server {\n\tlisten 80;\n\tserver_name ~.;\n\tlocation /download/ {\n\t\talias /project_data/; \n\t\tautoindex on;\n\t}\n}")  # The species nginx conf
        except FileExistsError:
            logging.debug("NginX conf exists")


        organism_annotation_dir, organism_genome_dir = None, None

        # Creation (or updating) of the src_data directory tree
        # Depth 0
        try:
            os.mkdir("./src_data")
        except FileExistsError:
            logging.debug("src_data folder already exist for %s" % self.full_name)
        except PermissionError:
            logging.critical("Insufficient permission to create src_data directory tree")
            sys.exit()

        # Depth 1
        try:
            os.mkdir("./src_data/annotation")
            os.mkdir("./src_data/genome")
            os.mkdir("./src_data/tracks")
        except FileExistsError:
            logging.debug("Depth 1 src_data folder(s) already exist for %s" % self.full_name)
        except PermissionError:
            logging.critical("Insufficient permission to create src_data directory tree")
            sys.exit()

        # Depth 2
        try:
            os.mkdir("./src_data/annotation/" + self.species_folder_name)
            os.mkdir("./src_data/genome/" + self.species_folder_name)
        except FileExistsError:
            logging.debug("Depth 2 src_data folder(s) already exist for %s" % self.full_name)
        except PermissionError:
            logging.critical("Insufficient permission to create src_data directory tree")
            sys.exit()

        # Depth 3
        try:
            os.mkdir("./src_data/annotation/" + self.species_folder_name + "/OGS" + self.ogs_version)
            os.mkdir("./src_data/genome/" + self.species_folder_name + "/v" + self.genome_version)
            organism_annotation_dir = os.path.abspath("./src_data/annotation/" + self.species_folder_name + "/OGS" + self.genome_version)
            organism_genome_dir = os.path.abspath("./src_data/genome/" + self.species_folder_name + "/v" + self.genome_version)
        except FileExistsError:
            logging.debug("Depth 3 src_data folder(s) already exist for %s" % self.full_name)
        except PermissionError:
            logging.critical("Insufficient permission to create src_data directory tree")
            sys.exit()

        # Return to main_dir
        os.chdir(self.main_dir)


    def make_compose_files(self):
        """
        Create a formatted copy of the template compose file inside a species directory tree

        :return:
        """

        os.chdir(self.main_dir)
        try:
            os.chdir(self.species_dir)
        except OSError:
            logging.critical("Cannot access " + self.species_dir)
            sys.exit(0)

        # Path to the templates used to generate the custom docker-compose files for an input species
        stack_template_path = self.script_dir + "/templates/compose_template.yml"
        traefik_template_path = self.script_dir + "/templates/traefik.yml"
        # authelia_config_path = self.script_dir + "/templates/authelia_config_example.yml"  # Do not copy the authelia config!
        authelia_users_path = self.script_dir + "/templates/authelia_users.yml"

        # Set the genus_species_strain_sex var, used
        genus_species_strain_sex = "{0}_{1}".format(self.genus.lower(), self.species)
        if self.sex and self.strain:
            genus_species_strain_sex = "_".join([self.genus.lower(), self.species, self.strain, self.sex])
        elif self.sex and not self.strain:
            genus_species_strain_sex = "_".join([self.genus.lower(), self.species, self.sex])
        else:
            genus_species_strain_sex = "{0}_{1}".format(self.genus.lower(), self.species)

        with open(stack_template_path, 'r') as infile:
            organism_content = list()
            for line in infile:
                # Replace placeholders in the compose file and append line to output
                organism_content.append(
                    line.replace("genus_species",
                                 str(self.genus.lower() + "_" + self.species)).replace("Genus species",
                                 str(self.genus_uppercase + " " + self.species)).replace("Genus/species",
                                 str(self.genus_uppercase + "/" + self.species)).replace("gspecies",
                                 str(self.genus.lower()[0] + self.species)).replace("genus_species_strain_sex",
                                 genus_species_strain_sex))
            # Write/format the output compose file
            with open("./docker-compose.yml", 'w') as outfile:
                outfile.truncate(0)  # Delete file content
                for line in organism_content:  # Replace env variables by those in the config file
                    for env_variable, value in self.config.items():
                        if env_variable in line:
                            line = line.replace(env_variable, value)
                            print(line)
                            break
                    outfile.write(line)

            # Store and open the formatted docker-compose.yml file
            self.create_mounts(working_dir=self.species_dir)

            # TODO: obsolete?
            # Call create_mounts.py (replace subprocess.DEVNULL by subprocess.PIPE to get script stdout and stderr back)
            # subprocess.call(["python3", self.script_dir + "/create_mounts.py"], cwd=self.species_dir,
            #                 stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)  # Create mounts for the containers

        print(self.config)

        # Store the traefik directory path to be able to create volumes for the traefik containers
        traefik_dir = None
        try:
            os.chdir(os.path.abspath(self.main_dir))
            os.mkdir("./traefik")
            os.mkdir("./traefik/authelia")
            if self.config["custom_authelia_config_path"]:
                print("Authelia configuration found in the config file, placing it in ./traefik/authelia/")

            # if not os.path.isfile("../traefik/authelia/configuration.yml"):  # TODO: obsolete?
            #     shutil.copy(authelia_config_path, "../traefik/authelia/configuration.yml")  # change variables by hand and adds the path of your authelia configuration in the config file
            if not os.path.isfile("./traefik/authelia/users.yml"):
                shutil.copy(authelia_users_path, "./traefik/authelia/users.yml")
            # subprocess.call(["python3", self.script_dir + "/create_mounts.py"], cwd=self.species_dir,
            #                 stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)  # Create mounts for the containers # TODO: obsolete?
        except FileExistsError:
            logging.debug("Traefik directory already exists: %s" % os.path.abspath("../traefik"))
        try:
            if not os.path.isfile("./traefik/docker-compose.yml"):
                shutil.copy(traefik_template_path, "./traefik/docker-compose.yml")
            else:
                logging.debug("Traefik compose file already exists: %s" % os.path.abspath("./traefik/docker-compose.yml"))
        except FileExistsError:
            logging.debug("Traefik compose file already exists: %s" % os.path.abspath("./traefik/docker-compose.yml"))

        traefik_dir = os.path.abspath(os.path.join(self.main_dir, "traefik"))
        self.create_mounts(working_dir=traefik_dir)
        # subprocess.call(["python3", self.script_dir + "/create_mounts.py"], cwd=self.species_dir) # TODO: obsolete?

        os.chdir(self.main_dir)

    def create_mounts(self, working_dir):
        """

        :return:
        """

        # Change directory to create mount points for the container
        try:
            os.chdir(os.path.abspath(working_dir))
        except Exception:
            logging.critical("Cannot access %s, exiting" % working_dir)
            sys.exit()
        compose_yml = os.path.abspath("./docker-compose.yml")
        if not os.path.isfile(compose_yml):
            raise Exception("Could not find docker-compose.yml at %s" % compose_yml)

        with open(compose_yml) as f:
            compose = yaml.safe_load(f)

        if 'services' not in compose:
            raise Exception("Could not find services tag in docker-compose.yml")

        # Iterate over all services to find the "volumes" we need to create
        for service in compose['services']:
            if 'volumes' in compose['services'][service]:
                for volume in compose['services'][service]['volumes']:
                    # regex to match the volumes of the services
                    reg = re.match(r"^(\./[^:]+/):[^:]+(:\w+)?$", volume)
                    if reg:
                        vol_dir = os.path.abspath('./' + reg.group(1))
                        if not os.path.exists(vol_dir):
                            os.makedirs(vol_dir, exist_ok=True)
                    else:
                        reg = re.match(r"^(\./[^:]+):[^:]+(:\w+)?$", volume)
                        if reg:
                            vol_file = os.path.abspath('./' + reg.group(1))
                            vol_dir = os.path.dirname(vol_file)
                            if not os.path.exists(vol_dir):
                                os.makedirs(vol_dir, exist_ok=True)
                            if not os.path.exists(vol_file):
                                Path(vol_file).touch()

        # Go back to the "main" directory
        try:
            os.chdir(os.path.abspath(self.main_dir))
        except Exception:
            logging.critical("Cannot access main directory (%s), exiting" % self.main_dir)
            sys.exit()

    def deploy_stack(self):
        """
        Call the script "deploy.sh" used to initiliaze the swarm cluster if needed and
        launch/update the current organism's stack

        This script first try to deploy the traefik stack, then deploy the organism stack, then update the traefik stack
        The stacks are updated if already deployed

        :return:
        """

        # # Create our swarm cluster if it doesn't exist
        # subprocess.Popen(["docker", "swarm", "init"],
        #                  stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=self.main_dir)
        #
        # # Deploy/update the stack for the current species
        # subprocess.Popen(["docker", "stack", "deploy", "-c", "./docker-compose.yml", "{0}_{1}".format(self.genus_lowercase, self.species)],
        #                  stdout=subprocess.PIPE, stderr=subprocess.PIPE, cwd=self.main_dir)

        # Launch and update docker stacks
        # noinspection PyArgumentList
        deploy_stacks_popen = subprocess.Popen(["sh", self.script_dir + "/deploy.sh", self.genus_species,
                                                self.main_dir + "/traefik"],
                                               stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
                                               universal_newlines=True)

        for stdout_line in iter(deploy_stacks_popen.stdout.readline, ""):
            if "daemon" in stdout_line:  # Ignore swarm init error output
                pass
            else:
                logging.info("\t%s" % stdout_line.strip())
        deploy_stacks_popen.stdout.close()


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Automatic data loading in containers and interaction "
                                                 "with galaxy instances for GGA"
                                                 ", following the protocol @ "
                                                 "http://gitlab.sb-roscoff.fr/abims/e-infra/gga")

    parser.add_argument("input",
                        type=str,
                        help="Input file (yml)")

    parser.add_argument("-v", "--verbose",
                        help="Increase output verbosity",
                        action="store_true")

    parser.add_argument("--config",
                        type=str,
                        help="Config path, default to the 'config' file inside the script repository")

    parser.add_argument("--main-directory",
                        type=str,
                        help="Where the stack containers will be located, defaults to current directory")

    args = parser.parse_args()

    if args.verbose:
        logging.basicConfig(level=logging.DEBUG)
    else:
        logging.basicConfig(level=logging.INFO)

    # Parsing the config file if provided, using the default config otherwise
    if not args.config:
        args.config = os.path.join(os.path.dirname(os.path.realpath(sys.argv[0])), "config")
    else:
        args.config = os.path.abspath(args.config)

    if not args.main_directory:
        args.main_directory = os.getcwd()
    else:
        args.main_directory = os.path.abspath(args.main_directory)

    sp_dict_list = utilities.parse_input(os.path.abspath(args.input))

    logging.info("Deploying stacks for organisms in input file %s" % args.input)
    for sp_dict in sp_dict_list:

        # Init instance
        deploy_stack_for_current_organism = DeploySpeciesStack(parameters_dictionary=sp_dict)

        # Setting some of the instance attributes
        deploy_stack_for_current_organism.main_dir = os.getcwd()
        deploy_stack_for_current_organism.species_dir = os.path.join(deploy_stack_for_current_organism.main_dir,
                                                                     deploy_stack_for_current_organism.genus_species +
                                                                     "/")

        # Parse the config yaml file
        deploy_stack_for_current_organism.config = utilities.parse_config(args.config)
        # Set the instance url attribute
        for env_variable, value in deploy_stack_for_current_organism.config.items():
            if env_variable == "custom_host":
                deploy_stack_for_current_organism.instance_url = value + \
                                                                 deploy_stack_for_current_organism.genus_lowercase + \
                                                                 "_" + deploy_stack_for_current_organism.species + \
                                                                 "/galaxy/"

        # Starting
        logging.info("gga_init.py called for %s" % deploy_stack_for_current_organism.full_name)

        # Make/update directory tree
        deploy_stack_for_current_organism.make_directory_tree()
        logging.info("Successfully generated the directory tree for %s" % deploy_stack_for_current_organism.full_name)

        # Make compose files
        deploy_stack_for_current_organism.make_compose_files()
        logging.info("Successfully generated the docker-compose files for %s" % deploy_stack_for_current_organism.full_name)

        # Deploy the stack
        logging.info("Deploying stack for %s..." % deploy_stack_for_current_organism.full_name)
        deploy_stack_for_current_organism.deploy_stack()
        logging.info("Successfully deployed stack for %s" % deploy_stack_for_current_organism.full_name)

        logging.info("Stack deployed for %s" % deploy_stack_for_current_organism.full_name)

        # TODO: IF GENUS°1 == GENUS°2 AND SP°1 == SP°2 --> SKIP INIT, CONTINUE TO NEXT ITEM IN INPUT

    # TODO: RELOAD TRAEFIK OUTSIDE LOOP
    logging.info("All stacks deployed for organisms in input file %s" % args.input)