# Licensed to the Apache Software Foundation (ASF) under one
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# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
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# under the License.
"""Connection sub-commands"""
import io
import json
import os
import sys
import warnings
from pathlib import Path
from typing import Any, Dict, List
from urllib.parse import urlparse, urlunparse

from sqlalchemy.orm import exc

from airflow.cli.simple_table import AirflowConsole
from airflow.compat.functools import cache
from airflow.exceptions import AirflowNotFoundException
from airflow.hooks.base import BaseHook
from airflow.models import Connection
from airflow.providers_manager import ProvidersManager
from airflow.secrets.local_filesystem import load_connections_dict
from airflow.utils import cli as cli_utils, yaml
from airflow.utils.cli import suppress_logs_and_warning
from airflow.utils.session import create_session


def _connection_mapper(conn: Connection) -> Dict[str, Any]:
    return {
        'id': conn.id,
        'conn_id': conn.conn_id,
        'conn_type': conn.conn_type,
        'description': conn.description,
        'host': conn.host,
        'schema': conn.schema,
        'login': conn.login,
        'password': conn.password,
        'port': conn.port,
        'is_encrypted': conn.is_encrypted,
        'is_extra_encrypted': conn.is_encrypted,
        'extra_dejson': conn.extra_dejson,
        'get_uri': conn.get_uri(),
    }


@suppress_logs_and_warning
def connections_get(args):
    """Get a connection."""
    try:
        conn = BaseHook.get_connection(args.conn_id)
    except AirflowNotFoundException:
        raise SystemExit("Connection not found.")
    AirflowConsole().print_as(
        data=[conn],
        output=args.output,
        mapper=_connection_mapper,
    )


@suppress_logs_and_warning
def connections_list(args):
    """Lists all connections at the command line"""
    with create_session() as session:
        query = session.query(Connection)
        if args.conn_id:
            query = query.filter(Connection.conn_id == args.conn_id)
        conns = query.all()

        AirflowConsole().print_as(
            data=conns,
            output=args.output,
            mapper=_connection_mapper,
        )


def _connection_to_dict(conn: Connection) -> dict:
    return dict(
        conn_type=conn.conn_type,
        description=conn.description,
        login=conn.login,
        password=conn.password,
        host=conn.host,
        port=conn.port,
        schema=conn.schema,
        extra=conn.extra,
    )


def _format_connections(conns: List[Connection], file_format: str, serialization_format: str) -> str:
    if serialization_format == 'json':
        serializer_func = lambda x: json.dumps(_connection_to_dict(x))
    elif serialization_format == 'uri':
        serializer_func = Connection.get_uri
    else:
        raise SystemExit(f"Received unexpected value for `--serialization-format`: {serialization_format!r}")
    if file_format == '.env':
        connections_env = ""
        for conn in conns:
            connections_env += f"{conn.conn_id}={serializer_func(conn)}\n"
        return connections_env

    connections_dict = {}
    for conn in conns:
        connections_dict[conn.conn_id] = _connection_to_dict(conn)

    if file_format == '.yaml':
        return yaml.dump(connections_dict)

    if file_format == '.json':
        return json.dumps(connections_dict, indent=2)

    return json.dumps(connections_dict)


def _is_stdout(fileio: io.TextIOWrapper) -> bool:
    return fileio.name == '<stdout>'


def _valid_uri(uri: str) -> bool:
    """Check if a URI is valid, by checking if both scheme and netloc are available"""
    uri_parts = urlparse(uri)
    return uri_parts.scheme != '' and uri_parts.netloc != ''


@cache
def _get_connection_types():
    """Returns connection types available."""
    _connection_types = ['fs', 'mesos_framework-id', 'email', 'generic']
    providers_manager = ProvidersManager()
    for connection_type, provider_info in providers_manager.hooks.items():
        if provider_info:
            _connection_types.append(connection_type)
    return _connection_types


def _valid_conn_type(conn_type: str) -> bool:
    return conn_type in _get_connection_types()


def connections_export(args):
    """Exports all connections to a file"""
    file_formats = ['.yaml', '.json', '.env']
    if args.format:
        warnings.warn("Option `--format` is deprecated.  Use `--file-format` instead.", DeprecationWarning)
    if args.format and args.file_format:
        raise SystemExit('Option `--format` is deprecated.  Use `--file-format` instead.')
    default_format = '.json'
    provided_file_format = None
    if args.format or args.file_format:
        provided_file_format = f".{(args.format or args.file_format).lower()}"

    file_is_stdout = _is_stdout(args.file)
    if file_is_stdout:
        filetype = provided_file_format or default_format
    elif provided_file_format:
        filetype = provided_file_format
    else:
        filetype = Path(args.file.name).suffix
        filetype = filetype.lower()
        if filetype not in file_formats:
            raise SystemExit(
                f"Unsupported file format. The file must have the extension {', '.join(file_formats)}."
            )

    if args.serialization_format and not filetype == '.env':
        raise SystemExit("Option `--serialization-format` may only be used with file type `env`.")

    with create_session() as session:
        connections = session.query(Connection).order_by(Connection.conn_id).all()

    msg = _format_connections(
        conns=connections,
        file_format=filetype,
        serialization_format=args.serialization_format or 'uri',
    )

    with args.file as f:
        f.write(msg)

    if file_is_stdout:
        print("\nConnections successfully exported.", file=sys.stderr)
    else:
        print(f"Connections successfully exported to {args.file.name}.")


alternative_conn_specs = ['conn_type', 'conn_host', 'conn_login', 'conn_password', 'conn_schema', 'conn_port']


@cli_utils.action_cli
def connections_add(args):
    """Adds new connection"""
    has_uri = bool(args.conn_uri)
    has_json = bool(args.conn_json)
    has_type = bool(args.conn_type)

    if not has_type and not (has_json or has_uri):
        raise SystemExit('Must supply either conn-uri or conn-json if not supplying conn-type')

    if has_json and has_uri:
        raise SystemExit('Cannot supply both conn-uri and conn-json')

    if has_type and not (args.conn_type in _get_connection_types()):
        warnings.warn(f'The type provided to --conn-type is invalid: {args.conn_type}')
        warnings.warn(
            f'Supported --conn-types are:{_get_connection_types()}.'
            'Hence overriding the conn-type with generic'
        )
        args.conn_type = 'generic'

    if has_uri or has_json:
        invalid_args = []
        if has_uri and not _valid_uri(args.conn_uri):
            raise SystemExit(f'The URI provided to --conn-uri is invalid: {args.conn_uri}')

        for arg in alternative_conn_specs:
            if getattr(args, arg) is not None:
                invalid_args.append(arg)

        if has_json and args.conn_extra:
            invalid_args.append("--conn-extra")

        if invalid_args:
            raise SystemExit(
                "The following args are not compatible with "
                f"the --conn-{'uri' if has_uri else 'json'} flag: {invalid_args!r}"
            )

    if args.conn_uri:
        new_conn = Connection(conn_id=args.conn_id, description=args.conn_description, uri=args.conn_uri)
        if args.conn_extra is not None:
            new_conn.set_extra(args.conn_extra)
    elif args.conn_json:
        new_conn = Connection.from_json(conn_id=args.conn_id, value=args.conn_json)
        if not new_conn.conn_type:
            raise SystemExit('conn-json is invalid; must supply conn-type')
    else:
        new_conn = Connection(
            conn_id=args.conn_id,
            conn_type=args.conn_type,
            description=args.conn_description,
            host=args.conn_host,
            login=args.conn_login,
            password=args.conn_password,
            schema=args.conn_schema,
            port=args.conn_port,
        )
        if args.conn_extra is not None:
            new_conn.set_extra(args.conn_extra)

    with create_session() as session:
        if not session.query(Connection).filter(Connection.conn_id == new_conn.conn_id).first():
            session.add(new_conn)
            msg = 'Successfully added `conn_id`={conn_id} : {uri}'
            msg = msg.format(
                conn_id=new_conn.conn_id,
                uri=args.conn_uri
                or urlunparse(
                    (
                        new_conn.conn_type,
                        f"{new_conn.login or ''}:{'******' if new_conn.password else ''}"
                        f"@{new_conn.host or ''}:{new_conn.port or ''}",
                        new_conn.schema or '',
                        '',
                        '',
                        '',
                    )
                ),
            )
            print(msg)
        else:
            msg = f'A connection with `conn_id`={new_conn.conn_id} already exists.'
            raise SystemExit(msg)


@cli_utils.action_cli
def connections_delete(args):
    """Deletes connection from DB"""
    with create_session() as session:
        try:
            to_delete = session.query(Connection).filter(Connection.conn_id == args.conn_id).one()
        except exc.NoResultFound:
            raise SystemExit(f'Did not find a connection with `conn_id`={args.conn_id}')
        except exc.MultipleResultsFound:
            raise SystemExit(f'Found more than one connection with `conn_id`={args.conn_id}')
        else:
            session.delete(to_delete)
            print(f"Successfully deleted connection with `conn_id`={to_delete.conn_id}")


@cli_utils.action_cli(check_db=False)
def connections_import(args):
    """Imports connections from a file"""
    if os.path.exists(args.file):
        _import_helper(args.file)
    else:
        raise SystemExit("Missing connections file.")


def _import_helper(file_path):
    """Load connections from a file and save them to the DB. On collision, skip."""
    connections_dict = load_connections_dict(file_path)
    with create_session() as session:
        for conn_id, conn in connections_dict.items():
            if session.query(Connection).filter(Connection.conn_id == conn_id).first():
                print(f'Could not import connection {conn_id}: connection already exists.')
                continue

            session.add(conn)
            session.commit()
            print(f'Imported connection {conn_id}')
