#########################################################################
#
# pgAdmin 4 - PostgreSQL Tools
#
# Copyright (C) 2013 - 2020, The pgAdmin Development Team
# This software is released under the PostgreSQL Licence
#
##########################################################################

"""Perform the initial setup of the application, by creating the auth
and settings database."""

import argparse
import json
import os
import sys
from pgadmin.model import db, User, Version, ServerGroup, Server, \
    SCHEMA_VERSION as CURRENT_SCHEMA_VERSION

if sys.version_info[0] >= 3:
    import builtins
else:
    import __builtin__ as builtins

# Grab the SERVER_MODE if it's been set by the runtime
if 'SERVER_MODE' in globals():
    builtins.SERVER_MODE = globals()['SERVER_MODE']
else:
    builtins.SERVER_MODE = None

# We need to include the root directory in sys.path to ensure that we can
# find everything we need when running in the standalone runtime.
root = os.path.dirname(os.path.realpath(__file__))
if sys.path[0] != root:
    sys.path.insert(0, root)

from pgadmin import create_app


def add_value(attr_dict, key, value):
    """Add a value to the attribute dict if non-empty.

    Args:
        attr_dict (dict): The dictionary to add the values to
        key (str): The key for the new value
        value (str): The value to add

    Returns:
        The updated attribute dictionary
    """
    if value != "" and value is not None:
        attr_dict[key] = value

    return attr_dict


def dump_servers(args):
    """Dump the server groups and servers.

    Args:
        args (ArgParser): The parsed command line options
    """
    app = create_app()
    with app.app_context():

        # What user?
        if args.user is not None:
            dump_user = args.user
        else:
            dump_user = config.DESKTOP_USER

        user = User.query.filter_by(email=dump_user).first()

        if user is None:
            print("The specified user ID (%s) could not be found." %
                  dump_user)
            sys.exit(1)

        user_id = user.id

        # Dict to collect the output
        object_dict = {}

        # Counters
        servers_dumped = 0

        # Dump servers
        servers = Server.query.filter_by(user_id=user_id).all()
        server_dict = {}
        for server in servers:
            if args.servers is None or str(server.id) in args.servers:
                # Get the group name
                group_name = ServerGroup.query.filter_by(
                    user_id=user_id, id=server.servergroup_id).first().name

                attr_dict = {}
                add_value(attr_dict, "Name", server.name)
                add_value(attr_dict, "Group", group_name)
                add_value(attr_dict, "Host", server.host)
                add_value(attr_dict, "HostAddr", server.hostaddr)
                add_value(attr_dict, "Port", server.port)
                add_value(attr_dict, "MaintenanceDB", server.maintenance_db)
                add_value(attr_dict, "Username", server.username)
                add_value(attr_dict, "Role", server.role)
                add_value(attr_dict, "SSLMode", server.ssl_mode)
                add_value(attr_dict, "Comment", server.comment)
                add_value(attr_dict, "DBRestriction", server.db_res)
                add_value(attr_dict, "PassFile", server.passfile)
                add_value(attr_dict, "SSLCert", server.sslcert)
                add_value(attr_dict, "SSLKey", server.sslkey)
                add_value(attr_dict, "SSLRootCert", server.sslrootcert)
                add_value(attr_dict, "SSLCrl", server.sslcrl)
                add_value(attr_dict, "SSLCompression", server.sslcompression)
                add_value(attr_dict, "BGColor", server.bgcolor)
                add_value(attr_dict, "FGColor", server.fgcolor)
                add_value(attr_dict, "Service", server.service)
                add_value(attr_dict, "Timeout", server.connect_timeout)
                add_value(attr_dict, "UseSSHTunnel", server.use_ssh_tunnel)
                add_value(attr_dict, "TunnelHost", server.tunnel_host)
                add_value(attr_dict, "TunnelPort", server.tunnel_port)
                add_value(attr_dict, "TunnelUsername", server.tunnel_username)
                add_value(attr_dict, "TunnelAuthentication",
                          server.tunnel_authentication)

                servers_dumped = servers_dumped + 1

                server_dict[servers_dumped] = attr_dict

        object_dict["Servers"] = server_dict

        try:
            f = open(args.dump_servers, "w")
        except Exception as e:
            print("Error opening output file %s: [%d] %s" %
                  (args.dump_servers, e.errno, e.strerror))
            sys.exit(1)

        try:
            f.write(json.dumps(object_dict, indent=4))
        except Exception as e:
            print("Error writing output file %s: [%d] %s" %
                  (args.dump_servers, e.errno, e.strerror))
            sys.exit(1)

        f.close()

        print("Configuration for %s servers dumped to %s." %
              (servers_dumped, args.dump_servers))


def load_servers(args):
    """Load server groups and servers.

    Args:
        args (ArgParser): The parsed command line options
    """
    try:
        with open(args.load_servers) as f:
            data = json.load(f)
    except json.decoder.JSONDecodeError as e:
        print("Error parsing input file %s: %s" %
              (args.load_servers, e))
        sys.exit(1)
    except Exception as e:
        print("Error reading input file %s: [%d] %s" %
              (args.load_servers, e.errno, e.strerror))
        sys.exit(1)

    f.close()

    app = create_app()
    with app.app_context():

        # What user?
        if args.user is not None:
            dump_user = args.user
        else:
            dump_user = config.DESKTOP_USER

        user = User.query.filter_by(email=dump_user).first()

        if user is None:
            print("The specified user ID (%s) could not be found." %
                  dump_user)
            sys.exit(1)

        user_id = user.id

        # Counters
        groups_added = 0
        servers_added = 0

        # Get the server groups
        groups = ServerGroup.query.filter_by(user_id=user_id)

        def print_summary():
            print("Added %d Server Group(s) and %d Server(s)." %
                  (groups_added, servers_added))
        # Loop through the servers...
        if "Servers" not in data:
            print("'Servers' attribute not found in file '%s'" %
                  args.load_servers)
            print_summary()
            sys.exit(1)

        for server in data["Servers"]:
            obj = data["Servers"][server]

            def check_attrib(attrib):
                if attrib not in obj:
                    print("'%s' attribute not found for server '%s'" %
                          (attrib, server))
                    print_summary()
                    sys.exit(1)

            check_attrib("Name")
            check_attrib("Group")
            check_attrib("Port")
            check_attrib("Username")
            check_attrib("SSLMode")
            check_attrib("MaintenanceDB")

            if "Host" not in obj and \
                "HostAddr" not in obj and \
                    "Service" not in obj:
                print("'Host', 'HostAddr' or 'Service' attribute not found "
                      "for server '%s'" % server)
                print_summary()
                sys.exit(1)

            # Get the group. Create if necessary
            group_id = -1
            for g in groups:
                if g.name == obj["Group"]:
                    group_id = g.id
                    break

            if group_id == -1:
                new_group = ServerGroup()
                new_group.name = obj["Group"]
                new_group.user_id = user_id
                db.session.add(new_group)

                try:
                    db.session.commit()
                except Exception as e:
                    print("Error creating server group '%s': %s" %
                          (new_group.name, e))
                    print_summary()
                    sys.exit(1)

                group_id = new_group.id
                groups_added = groups_added + 1
                groups = ServerGroup.query.filter_by(user_id=user_id)

            # Create the server
            new_server = Server()
            new_server.name = obj["Name"]
            new_server.servergroup_id = group_id
            new_server.user_id = user_id

            new_server.host = obj["Host"]

            if "HostAddr" in obj:
                new_server.hostaddr = obj["HostAddr"]

            new_server.port = obj["Port"]
            new_server.maintenance_db = obj["MaintenanceDB"]
            new_server.username = obj["Username"]

            if "Role" in obj:
                new_server.role = obj["Role"]

            new_server.ssl_mode = obj["SSLMode"]

            if "Comment" in obj:
                new_server.comment = obj["Comment"]

            if "DBRestriction" in obj:
                new_server.db_res = obj["DBRestriction"]

            if "PassFile" in obj:
                new_server.passfile = obj["PassFile"]

            if "SSLCert" in obj:
                new_server.sslcert = obj["SSLCert"]

            if "SSLKey" in obj:
                new_server.sslkey = obj["SSLKey"]

            if "SSLRootCert" in obj:
                new_server.sslrootcert = obj["SSLRootCert"]

            if "SSLCrl" in obj:
                new_server.sslcrl = obj["SSLCrl"]

            if "SSLCompression" in obj:
                new_server.sslcompression = obj["SSLCompression"]

            if "BGColor" in obj:
                new_server.bgcolor = obj["BGColor"]

            if "FGColor" in obj:
                new_server.fgcolor = obj["FGColor"]

            if "Service" in obj:
                new_server.service = obj["Service"]

            if "Timeout" in obj:
                new_server.connect_timeout = obj["Timeout"]

            if "UseSSHTunnel" in obj:
                new_server.use_ssh_tunnel = obj["UseSSHTunnel"]

            if "TunnelHost" in obj:
                new_server.tunnel_host = obj["TunnelHost"]

            if "TunnelPort" in obj:
                new_server.tunnel_port = obj["TunnelPort"]

            if "TunnelUsername" in obj:
                new_server.tunnel_username = obj["TunnelUsername"]

            if "TunnelAuthentication" in obj:
                new_server.tunnel_authentication = obj["TunnelAuthentication"]

            db.session.add(new_server)

            try:
                db.session.commit()
            except Exception as e:
                print("Error creating server '%s': %s" %
                      (new_server.name, e))
                print_summary()
                sys.exit(1)

            servers_added = servers_added + 1

        print_summary()


def setup_db():
    """Setup the configuration database."""

    create_app_data_directory(config)

    app = create_app()

    print(u"pgAdmin 4 - Application Initialisation")
    print(u"======================================\n")

    with app.app_context():
        # Run migration for the first time i.e. create database
        from config import SQLITE_PATH
        if not os.path.exists(SQLITE_PATH):
            db_upgrade(app)
        else:
            version = Version.query.filter_by(name='ConfigDB').first()
            schema_version = version.value

            # Run migration if current schema version is greater than the
            # schema version stored in version table
            if CURRENT_SCHEMA_VERSION >= schema_version:
                db_upgrade(app)

            # Update schema version to the latest
            if CURRENT_SCHEMA_VERSION > schema_version:
                version = Version.query.filter_by(name='ConfigDB').first()
                version.value = CURRENT_SCHEMA_VERSION
                db.session.commit()

        if os.name != 'nt':
            os.chmod(config.SQLITE_PATH, 0o600)


if __name__ == '__main__':
    # Configuration settings
    import config
    from pgadmin.model import SCHEMA_VERSION
    from pgadmin.setup import db_upgrade, create_app_data_directory

    parser = argparse.ArgumentParser(description='Setup the pgAdmin config DB')

    imp_exp_group = parser.add_mutually_exclusive_group(required=False)

    exp_group = imp_exp_group.add_argument_group('Dump server config')
    exp_group.add_argument('--dump-servers', metavar="OUTPUT_FILE",
                           help='Dump the servers in the DB', required=False)
    exp_group.add_argument('--servers', metavar="SERVERS", nargs='*',
                           help='One or more servers to dump', required=False)

    imp_group = imp_exp_group.add_argument_group('Load server config')
    imp_group.add_argument('--load-servers', metavar="INPUT_FILE",
                           help='Load servers into the DB', required=False)

    imp_exp_group.add_argument('--user', metavar="USER_NAME",
                               help='Dump/load servers for the specified '
                                    'username', required=False)

    args, extra = parser.parse_known_args()

    config.SETTINGS_SCHEMA_VERSION = SCHEMA_VERSION
    if "PGADMIN_TESTING_MODE" in os.environ and \
            os.environ["PGADMIN_TESTING_MODE"] == "1":
        config.SQLITE_PATH = config.TEST_SQLITE_PATH

    # What to do?
    if args.dump_servers is not None:
        dump_servers(args)
    elif args.load_servers is not None:
        load_servers(args)
    else:
        setup_db()