#!/usr/bin/env python

r"""
See class prolog below for details.
"""

import os
import sys
import yaml
import time
import platform
from errno import EACCES, EPERM
import subprocess
from ssh_utility import SSHRemoteclient


class FFDCCollector:

    r"""
    Sends commands from configuration file to the targeted system to collect log files.
    Fetch and store generated files at the specified location.

    """

    def __init__(self,
                 hostname,
                 username,
                 password,
                 ffdc_config,
                 location,
                 remote_type,
                 remote_protocol):
        r"""
        Description of argument(s):

        hostname                name/ip of the targeted (remote) system
        username                user on the targeted system with access to FFDC files
        password                password for user on targeted system
        ffdc_config             configuration file listing commands and files for FFDC
        location                where to store collected FFDC
        remote_type             os type of the remote host

        """
        if self.verify_script_env():
            self.hostname = hostname
            self.username = username
            self.password = password
            self.ffdc_config = ffdc_config
            self.location = location
            self.remote_client = None
            self.ffdc_dir_path = ""
            self.ffdc_prefix = ""
            self.target_type = remote_type.upper()
            self.remote_protocol = remote_protocol.upper()
            self.start_time = 0
            self.elapsed_time = ''
        else:
            sys.exit(-1)

        # Load default or user define YAML configuration file.
        with open(self.ffdc_config, 'r') as file:
            self.ffdc_actions = yaml.load(file, Loader=yaml.FullLoader)

        if self.target_type not in self.ffdc_actions.keys():
            print("\n\tERROR: %s is not listed in %s.\n\n" % (self.target_type, self.ffdc_config))
            sys.exit(-1)

    def verify_script_env(self):

        # Import to log version
        import click
        import paramiko

        run_env_ok = True

        redfishtool_version = self.run_redfishtool('-V').split(' ')[2].strip('\n')
        ipmitool_version = self.run_ipmitool('-V').split(' ')[2]

        print("\n\t---- Script host environment ----")
        print("\t{:<10}  {:<10}".format('Script hostname', os.uname()[1]))
        print("\t{:<10}  {:<10}".format('Script host os', platform.platform()))
        print("\t{:<10}  {:>10}".format('Python', platform.python_version()))
        print("\t{:<10}  {:>10}".format('PyYAML', yaml.__version__))
        print("\t{:<10}  {:>10}".format('click', click.__version__))
        print("\t{:<10}  {:>10}".format('paramiko', paramiko.__version__))
        print("\t{:<10}  {:>9}".format('redfishtool', redfishtool_version))
        print("\t{:<10}  {:>12}".format('ipmitool', ipmitool_version))

        if eval(yaml.__version__.replace('.', ',')) < (5, 4, 1):
            print("\n\tERROR: Python or python packages do not meet minimum version requirement.")
            print("\tERROR: PyYAML version 5.4.1 or higher is needed.\n")
            run_env_ok = False

        print("\t---- End script host environment ----")
        return run_env_ok

    def target_is_pingable(self):
        r"""
        Check if target system is ping-able.

        """
        response = os.system("ping -c 1 -w 2 %s  2>&1 >/dev/null" % self.hostname)
        if response == 0:
            print("\n\t[Check] %s is ping-able.\t\t [OK]" % self.hostname)
            return True
        else:
            print("\n>>>>>\tERROR: %s is not ping-able. FFDC collection aborted.\n" % self.hostname)
            sys.exit(-1)

    def collect_ffdc(self):
        r"""
        Initiate FFDC Collection depending on requested protocol.

        """

        print("\n\t---- Start communicating with %s ----" % self.hostname)
        self.start_time = time.time()
        working_protocol_list = []
        if self.target_is_pingable():
            # Check supported protocol ping,ssh, redfish are working.
            if self.ssh_to_target_system():
                working_protocol_list.append("SSH")
                working_protocol_list.append("SCP")

            # Redfish
            if self.verify_redfish():
                working_protocol_list.append("REDFISH")
                print("\n\t[Check] %s Redfish Service.\t\t [OK]" % self.hostname)
            else:
                print("\n\t[Check] %s Redfish Service.\t\t [NOT AVAILABLE]" % self.hostname)

            if self.verify_ipmi():
                working_protocol_list.append("IPMI")
                print("\n\t[Check] %s IPMI LAN Service.\t\t [OK]" % self.hostname)
            else:
                print("\n\t[Check] %s IPMI LAN Service.\t\t [NOT AVAILABLE]" % self.hostname)

            # Verify top level directory exists for storage
            self.validate_local_store(self.location)
            print("\n\t---- Completed protocol pre-requisite check ----\n")

            if ((self.remote_protocol not in working_protocol_list) and (self.remote_protocol != 'ALL')):
                print("\n\tWorking protocol list: %s" % working_protocol_list)
                print(
                    '>>>>>\tERROR: Requested protocol %s is not in working protocol list.\n'
                    % self.remote_protocol)
                sys.exit(-1)
            else:
                self.generate_ffdc(working_protocol_list)

    def ssh_to_target_system(self):
        r"""
        Open a ssh connection to targeted system.

        """

        self.remoteclient = SSHRemoteclient(self.hostname,
                                            self.username,
                                            self.password)

        self.remoteclient.ssh_remoteclient_login()
        print("\n\t[Check] %s SSH connection established.\t [OK]" % self.hostname)

        # Check scp connection.
        # If scp connection fails,
        # continue with FFDC generation but skip scp files to local host.
        self.remoteclient.scp_connection()
        return True

    def generate_ffdc(self, working_protocol_list):
        r"""
        Determine actions based on remote host type

        Description of argument(s):
        working_protocol_list    list of confirmed working protocols to connect to remote host.
        """

        print("\n\t---- Executing commands on " + self.hostname + " ----")
        print("\n\tWorking protocol list: %s" % working_protocol_list)

        # Set prefix values for scp files and directory.
        # Since the time stamp is at second granularity, these values are set here
        # to be sure that all files for this run will have same timestamps
        # and they will be saved in the same directory.
        # self.location == local system for now
        self.set_ffdc_defaults()
        ffdc_actions = self.ffdc_actions

        for machine_type in ffdc_actions.keys():
            if self.target_type != machine_type:
                continue

            print("\tSystem Type: %s" % machine_type)
            for k, v in ffdc_actions[machine_type].items():

                if self.remote_protocol != ffdc_actions[machine_type][k]['PROTOCOL'][0] \
                        and self.remote_protocol != 'ALL':
                    continue

                if ffdc_actions[machine_type][k]['PROTOCOL'][0] == 'SSH' \
                   or ffdc_actions[machine_type][k]['PROTOCOL'][0] == 'SCP':
                    if 'SSH' in working_protocol_list \
                       or 'SCP' in working_protocol_list:
                        self.protocol_ssh(ffdc_actions, machine_type, k)
                    else:
                        print("\n\tERROR: SSH or SCP is not available for %s." % self.hostname)

                if ffdc_actions[machine_type][k]['PROTOCOL'][0] == 'REDFISH':
                    if 'REDFISH' in working_protocol_list:
                        self.protocol_redfish(ffdc_actions, machine_type, k)
                    else:
                        print("\n\tERROR: REDFISH is not available for %s." % self.hostname)

                if ffdc_actions[machine_type][k]['PROTOCOL'][0] == 'IPMI':
                    if 'IPMI' in working_protocol_list:
                        self.protocol_ipmi(ffdc_actions, machine_type, k)
                    else:
                        print("\n\tERROR: IMPI is not available for %s." % self.hostname)

        # Close network connection after collecting all files
        self.elapsed_time = time.strftime("%H:%M:%S", time.gmtime(time.time() - self.start_time))
        self.remoteclient.ssh_remoteclient_disconnect()

    def protocol_ssh(self,
                     ffdc_actions,
                     machine_type,
                     sub_type):
        r"""
        Perform actions using SSH and SCP protocols.

        Description of argument(s):
        ffdc_actions        List of actions from ffdc_config.yaml.
        machine_type        OS Type of remote host.
        sub_type            Group type of commands.
        """

        if sub_type == 'DUMP_LOGS':
            self.group_copy(ffdc_actions[machine_type][sub_type])
        else:
            self.collect_and_copy_ffdc(ffdc_actions[machine_type][sub_type])

    def protocol_redfish(self,
                         ffdc_actions,
                         machine_type,
                         sub_type):
        r"""
        Perform actions using Redfish protocol.

        Description of argument(s):
        ffdc_actions        List of actions from ffdc_config.yaml.
        machine_type        OS Type of remote host.
        sub_type            Group type of commands.
        """

        print("\n\t[Run] Executing commands to %s using %s" % (self.hostname, 'REDFISH'))
        redfish_files_saved = []
        progress_counter = 0
        list_of_URL = ffdc_actions[machine_type][sub_type]['URL']
        for index, each_url in enumerate(list_of_URL, start=0):
            redfish_parm = '-u ' + self.username + ' -p ' + self.password + ' -r ' \
                           + self.hostname + ' -S Always raw GET ' + each_url

            result = self.run_redfishtool(redfish_parm)
            if result:
                try:
                    targ_file = self.get_file_list(ffdc_actions[machine_type][sub_type])[index]
                except IndexError:
                    targ_file = each_url.split('/')[-1]
                    print("\n\t[WARN] Missing filename to store data from redfish URL %s." % each_url)
                    print("\t[WARN] Data will be stored in %s." % targ_file)

                targ_file_with_path = (self.ffdc_dir_path
                                       + self.ffdc_prefix
                                       + targ_file)

                # Creates a new file
                with open(targ_file_with_path, 'w') as fp:
                    fp.write(result)
                    fp.close
                    redfish_files_saved.append(targ_file)

            progress_counter += 1
            self.print_progress(progress_counter)

        print("\n\t[Run] Commands execution completed.\t\t [OK]")

        for file in redfish_files_saved:
            print("\n\t\tSuccessfully save file " + file + ".")

    def protocol_ipmi(self,
                      ffdc_actions,
                      machine_type,
                      sub_type):
        r"""
        Perform actions using ipmitool over LAN protocol.

        Description of argument(s):
        ffdc_actions        List of actions from ffdc_config.yaml.
        machine_type        OS Type of remote host.
        sub_type            Group type of commands.
        """

        print("\n\t[Run] Executing commands to %s using %s" % (self.hostname, 'IPMI'))
        ipmi_files_saved = []
        progress_counter = 0
        list_of_cmd = self.get_command_list(ffdc_actions[machine_type][sub_type])
        for index, each_cmd in enumerate(list_of_cmd, start=0):
            ipmi_parm = '-U ' + self.username + ' -P ' + self.password + ' -H ' \
                + self.hostname + ' ' + each_cmd

            result = self.run_ipmitool(ipmi_parm)
            if result:
                try:
                    targ_file = self.get_file_list(ffdc_actions[machine_type][sub_type])[index]
                except IndexError:
                    targ_file = each_cmd.split('/')[-1]
                    print("\n\t[WARN] Missing filename to store data from IPMI %s." % each_cmd)
                    print("\t[WARN] Data will be stored in %s." % targ_file)

                targ_file_with_path = (self.ffdc_dir_path
                                       + self.ffdc_prefix
                                       + targ_file)

                # Creates a new file
                with open(targ_file_with_path, 'w') as fp:
                    fp.write(result)
                    fp.close
                    ipmi_files_saved.append(targ_file)

            progress_counter += 1
            self.print_progress(progress_counter)

        print("\n\t[Run] Commands execution completed.\t\t [OK]")

        for file in ipmi_files_saved:
            print("\n\t\tSuccessfully save file " + file + ".")

    def collect_and_copy_ffdc(self,
                              ffdc_actions_for_machine_type,
                              form_filename=False):
        r"""
        Send commands in ffdc_config file to targeted system.

        Description of argument(s):
        ffdc_actions_for_machine_type    commands and files for the selected remote host type.
        form_filename                    if true, pre-pend self.target_type to filename
        """

        # Executing commands, , if any
        self.ssh_execute_ffdc_commands(ffdc_actions_for_machine_type,
                                       form_filename)

        # Copying files
        if self.remoteclient.scpclient:
            print("\n\n\tCopying FFDC files from remote system %s.\n" % self.hostname)

            # Retrieving files from target system
            list_of_files = self.get_file_list(ffdc_actions_for_machine_type)
            self.scp_ffdc(self.ffdc_dir_path, self.ffdc_prefix, form_filename, list_of_files)
        else:
            print("\n\n\tSkip copying FFDC files from remote system %s.\n" % self.hostname)

    def get_command_list(self,
                         ffdc_actions_for_machine_type):
        r"""
        Fetch list of commands from configuration file

        Description of argument(s):
        ffdc_actions_for_machine_type    commands and files for the selected remote host type.
        """
        try:
            list_of_commands = ffdc_actions_for_machine_type['COMMANDS']
        except KeyError:
            list_of_commands = []
        return list_of_commands

    def get_file_list(self,
                      ffdc_actions_for_machine_type):
        r"""
        Fetch list of commands from configuration file

        Description of argument(s):
        ffdc_actions_for_machine_type    commands and files for the selected remote host type.
        """
        try:
            list_of_files = ffdc_actions_for_machine_type['FILES']
        except KeyError:
            list_of_files = []
        return list_of_files

    def ssh_execute_ffdc_commands(self,
                                  ffdc_actions_for_machine_type,
                                  form_filename=False):
        r"""
        Send commands in ffdc_config file to targeted system.

        Description of argument(s):
        ffdc_actions_for_machine_type    commands and files for the selected remote host type.
        form_filename                    if true, pre-pend self.target_type to filename
        """
        print("\n\t[Run] Executing commands on %s using %s"
              % (self.hostname, ffdc_actions_for_machine_type['PROTOCOL'][0]))

        list_of_commands = self.get_command_list(ffdc_actions_for_machine_type)
        # If command list is empty, returns
        if not list_of_commands:
            return

        progress_counter = 0
        for command in list_of_commands:
            if isinstance(command, dict):
                command_txt = next(iter(command))
                command_timeout = next(iter(command.values()))
            elif isinstance(command, str):
                command_txt = command
                # Default ssh command timeout 60 seconds
                command_timeout = 60

            if form_filename:
                command_txt = str(command_txt % self.target_type)

            err, response = self.remoteclient.execute_command(command_txt, command_timeout)

            progress_counter += 1
            self.print_progress(progress_counter)

        print("\n\t[Run] Commands execution completed.\t\t [OK]")

    def group_copy(self,
                   ffdc_actions_for_machine_type):
        r"""
        scp group of files (wild card) from remote host.

        Description of argument(s):
        ffdc_actions_for_machine_type    commands and files for the selected remote host type.
        """

        if self.remoteclient.scpclient:
            print("\n\tCopying DUMP files from remote system %s.\n" % self.hostname)

            list_of_commands = self.get_command_list(ffdc_actions_for_machine_type)
            # If command list is empty, returns
            if not list_of_commands:
                return

            for command in list_of_commands:
                try:
                    filename = command.split(' ')[2]
                except IndexError:
                    print("\t\tInvalid command %s for DUMP_LOGS block." % command)
                    continue

                err, response = self.remoteclient.execute_command(command)

                if response:
                    scp_result = self.remoteclient.scp_file_from_remote(filename, self.ffdc_dir_path)
                    if scp_result:
                        print("\t\tSuccessfully copied from " + self.hostname + ':' + filename)
                else:
                    print("\t\tThere is no " + filename)

        else:
            print("\n\n\tSkip copying files from remote system %s.\n" % self.hostname)

    def scp_ffdc(self,
                 targ_dir_path,
                 targ_file_prefix,
                 form_filename,
                 file_list=None,
                 quiet=None):
        r"""
        SCP all files in file_dict to the indicated directory on the local system.

        Description of argument(s):
        targ_dir_path                   The path of the directory to receive the files.
        targ_file_prefix                Prefix which will be pre-pended to each
                                        target file's name.
        file_dict                       A dictionary of files to scp from targeted system to this system

        """

        progress_counter = 0
        for filename in file_list:
            if form_filename:
                filename = str(filename % self.target_type)
            source_file_path = filename
            targ_file_path = targ_dir_path + targ_file_prefix + filename.split('/')[-1]

            # If source file name contains wild card, copy filename as is.
            if '*' in source_file_path:
                scp_result = self.remoteclient.scp_file_from_remote(source_file_path, self.ffdc_dir_path)
            else:
                scp_result = self.remoteclient.scp_file_from_remote(source_file_path, targ_file_path)

            if not quiet:
                if scp_result:
                    print("\t\tSuccessfully copied from " + self.hostname + ':' + source_file_path + ".\n")
                else:
                    print("\t\tFail to copy from " + self.hostname + ':' + source_file_path + ".\n")
            else:
                progress_counter += 1
                self.print_progress(progress_counter)

    def set_ffdc_defaults(self):
        r"""
        Set a default value for self.ffdc_dir_path and self.ffdc_prefix.
        Collected ffdc file will be stored in dir /self.location/hostname_timestr/.
        Individual ffdc file will have timestr_filename.

        Description of class variables:
        self.ffdc_dir_path  The dir path where collected ffdc data files should be put.

        self.ffdc_prefix    The prefix to be given to each ffdc file name.

        """

        timestr = time.strftime("%Y%m%d-%H%M%S")
        self.ffdc_dir_path = self.location + "/" + self.hostname + "_" + timestr + "/"
        self.ffdc_prefix = timestr + "_"
        self.validate_local_store(self.ffdc_dir_path)

    def validate_local_store(self, dir_path):
        r"""
        Ensure path exists to store FFDC files locally.

        Description of variable:
        dir_path  The dir path where collected ffdc data files will be stored.

        """

        if not os.path.exists(dir_path):
            try:
                os.mkdir(dir_path, 0o755)
            except (IOError, OSError) as e:
                # PermissionError
                if e.errno == EPERM or e.errno == EACCES:
                    print('>>>>>\tERROR: os.mkdir %s failed with PermissionError.\n' % dir_path)
                else:
                    print('>>>>>\tERROR: os.mkdir %s failed with %s.\n' % (dir_path, e.strerror))
                sys.exit(-1)

    def print_progress(self, progress):
        r"""
        Print activity progress +

        Description of variable:
        progress  Progress counter.

        """

        sys.stdout.write("\r\t" + "+" * progress)
        sys.stdout.flush()
        time.sleep(.1)

    def verify_redfish(self):
        r"""
        Verify remote host has redfish service active

        """
        redfish_parm = '-u ' + self.username + ' -p ' + self.password + ' -r ' \
                       + self.hostname + ' -S Always raw GET /redfish/v1/'
        return(self.run_redfishtool(redfish_parm, True))

    def verify_ipmi(self):
        r"""
        Verify remote host has IPMI LAN service active

        """
        ipmi_parm = '-U ' + self.username + ' -P ' + self.password + ' -H ' \
            + self.hostname + ' power status'
        return(self.run_ipmitool(ipmi_parm, True))

    def run_redfishtool(self,
                        parms_string,
                        quiet=False):
        r"""
        Run CLI redfishtool

        Description of variable:
        parms_string         redfishtool subcommand and options.
        quiet                do not print redfishtool error message if True
        """

        result = subprocess.run(['redfishtool ' + parms_string],
                                stdout=subprocess.PIPE,
                                stderr=subprocess.PIPE,
                                shell=True,
                                universal_newlines=True)

        if result.stderr and not quiet:
            print('\n\t\tERROR with redfishtool ' + parms_string)
            print('\t\t' + result.stderr)

        return result.stdout

    def run_ipmitool(self,
                     parms_string,
                     quiet=False):
        r"""
        Run CLI IPMI tool.

        Description of variable:
        parms_string         ipmitool subcommand and options.
        quiet                do not print redfishtool error message if True
        """

        result = subprocess.run(['ipmitool -I lanplus -C 17 ' + parms_string],
                                stdout=subprocess.PIPE,
                                stderr=subprocess.PIPE,
                                shell=True,
                                universal_newlines=True)

        if result.stderr and not quiet:
            print('\n\t\tERROR with ipmitool -I lanplus -C 17 ' + parms_string)
            print('\t\t' + result.stderr)

        return result.stdout