# -*- coding: utf-8 -*-
import datetime
import os
import uuid
import warnings

import cassandra.cluster
import pymongo
import pymysql.cursors
import redis
import logging


class ExternalSource(object):
    def __init__(
        self,
        name,
        internal_hostname,
        internal_port,
        docker_hostname,
        docker_port,
        user,
        password,
    ):
        self.name = name
        self.internal_hostname = internal_hostname
        self.internal_port = int(internal_port)
        self.docker_hostname = docker_hostname
        self.docker_port = int(docker_port)
        self.user = user
        self.password = password

    def get_source_str(self, table_name):
        raise NotImplementedError(
            "Method {} is not implemented for {}".format(
                "get_source_config_part", self.__class__.__name__
            )
        )

    def prepare(self, structure, table_name, cluster):
        raise NotImplementedError(
            "Method {} is not implemented for {}".format(
                "prepare_remote_source", self.__class__.__name__
            )
        )

    # data is banch of Row
    def load_data(self, data):
        raise NotImplementedError(
            "Method {} is not implemented for {}".format(
                "prepare_remote_source", self.__class__.__name__
            )
        )

    def compatible_with_layout(self, layout):
        return True


class SourceMySQL(ExternalSource):
    TYPE_MAPPING = {
        "UInt8": "tinyint unsigned",
        "UInt16": "smallint unsigned",
        "UInt32": "int unsigned",
        "UInt64": "bigint unsigned",
        "Int8": "tinyint",
        "Int16": "smallint",
        "Int32": "int",
        "Int64": "bigint",
        "UUID": "varchar(36)",
        "Date": "date",
        "DateTime": "datetime",
        "String": "text",
        "Float32": "float",
        "Float64": "double",
    }

    def create_mysql_conn(self):
        logging.debug(
            f"pymysql connect {self.user}, {self.password}, {self.internal_hostname}, {self.internal_port}"
        )
        self.connection = pymysql.connect(
            user=self.user,
            password=self.password,
            host=self.internal_hostname,
            port=self.internal_port,
        )

    def execute_mysql_query(self, query):
        with warnings.catch_warnings():
            warnings.simplefilter("ignore")
            with self.connection.cursor() as cursor:
                cursor.execute(query)
            self.connection.commit()

    def get_source_str(self, table_name):
        return """
                <mysql>
                    <replica>
                        <priority>1</priority>
                        <host>127.0.0.1</host>
                        <port>3333</port>   <!-- Wrong port, for testing basic failover to work. -->
                    </replica>
                    <replica>
                        <priority>2</priority>
                        <host>{hostname}</host>
                        <port>{port}</port>
                    </replica>
                    <user>{user}</user>
                    <password>{password}</password>
                    <db>test</db>
                    <table>{tbl}</table>
                </mysql>""".format(
            hostname=self.docker_hostname,
            port=self.docker_port,
            user=self.user,
            password=self.password,
            tbl=table_name,
        )

    def prepare(self, structure, table_name, cluster):
        if self.internal_hostname is None:
            self.internal_hostname = cluster.mysql8_ip
        self.create_mysql_conn()
        self.execute_mysql_query(
            "create database if not exists test default character set 'utf8'"
        )
        self.execute_mysql_query("drop table if exists test.{}".format(table_name))
        fields_strs = []
        for field in (
            structure.keys + structure.ordinary_fields + structure.range_fields
        ):
            fields_strs.append(field.name + " " + self.TYPE_MAPPING[field.field_type])
        create_query = """create table test.{table_name} (
            {fields_str});
        """.format(
            table_name=table_name, fields_str=",".join(fields_strs)
        )
        self.execute_mysql_query(create_query)
        self.ordered_names = structure.get_ordered_names()
        self.prepared = True

    def load_data(self, data, table_name):
        values_strs = []
        if not data:
            return
        for row in data:
            sorted_row = []
            for name in self.ordered_names:
                data = row.data[name]
                if isinstance(row.data[name], str):
                    data = "'" + data + "'"
                else:
                    data = str(data)
                sorted_row.append(data)
            values_strs.append("(" + ",".join(sorted_row) + ")")
        query = "insert into test.{} ({}) values {}".format(
            table_name, ",".join(self.ordered_names), ",".join(values_strs)
        )
        self.execute_mysql_query(query)


class SourceMongo(ExternalSource):
    def __init__(
        self,
        name,
        internal_hostname,
        internal_port,
        docker_hostname,
        docker_port,
        user,
        password,
        secure=False,
    ):
        ExternalSource.__init__(
            self,
            name,
            internal_hostname,
            internal_port,
            docker_hostname,
            docker_port,
            user,
            password,
        )
        self.secure = secure

    def get_source_str(self, table_name):
        return """
            <mongodb>
                <host>{host}</host>
                <port>{port}</port>
                <user>{user}</user>
                <password>{password}</password>
                <db>test</db>
                <collection>{tbl}</collection>
                {options}
            </mongodb>
        """.format(
            host=self.docker_hostname,
            port=self.docker_port,
            user=self.user,
            password=self.password,
            tbl=table_name,
            options="<options>ssl=true</options>" if self.secure else "",
        )

    def prepare(self, structure, table_name, cluster):
        connection_str = "mongodb://{user}:{password}@{host}:{port}".format(
            host=self.internal_hostname,
            port=self.internal_port,
            user=self.user,
            password=self.password,
        )
        if self.secure:
            connection_str += "/?tls=true&tlsAllowInvalidCertificates=true"
        self.connection = pymongo.MongoClient(connection_str)
        self.converters = {}
        for field in structure.get_all_fields():
            if field.field_type == "Date":
                self.converters[field.name] = lambda x: datetime.datetime.strptime(
                    x, "%Y-%m-%d"
                )
            elif field.field_type == "DateTime":

                def converter(x):
                    return datetime.datetime.strptime(x, "%Y-%m-%d %H:%M:%S")

                self.converters[field.name] = converter
            else:
                self.converters[field.name] = lambda x: x

        self.db = self.connection["test"]
        self.db.add_user(self.user, self.password)
        self.prepared = True

    def load_data(self, data, table_name):
        tbl = self.db[table_name]

        to_insert = []
        for row in data:
            row_dict = {}
            for cell_name, cell_value in list(row.data.items()):
                row_dict[cell_name] = self.converters[cell_name](cell_value)
            to_insert.append(row_dict)

        result = tbl.insert_many(to_insert)


class SourceMongoURI(SourceMongo):
    def compatible_with_layout(self, layout):
        # It is enough to test one layout for this dictionary, since we're
        # only testing that the connection with URI works.
        return layout.name == "flat"

    def get_source_str(self, table_name):
        return """
            <mongodb>
                <uri>mongodb://{user}:{password}@{host}:{port}/test{options}</uri>
                <collection>{tbl}</collection>
            </mongodb>
        """.format(
            host=self.docker_hostname,
            port=self.docker_port,
            user=self.user,
            password=self.password,
            tbl=table_name,
            options="?ssl=true" if self.secure else "",
        )


class SourceClickHouse(ExternalSource):
    def get_source_str(self, table_name):
        return """
            <clickhouse>
                <host>{host}</host>
                <port>{port}</port>
                <user>{user}</user>
                <password>{password}</password>
                <db>test</db>
                <table>{tbl}</table>
            </clickhouse>
        """.format(
            host=self.docker_hostname,
            port=self.docker_port,
            user=self.user,
            password=self.password,
            tbl=table_name,
        )

    def prepare(self, structure, table_name, cluster):
        self.node = cluster.instances[self.docker_hostname]
        self.node.query("CREATE DATABASE IF NOT EXISTS test")
        fields_strs = []
        for field in (
            structure.keys + structure.ordinary_fields + structure.range_fields
        ):
            fields_strs.append(field.name + " " + field.field_type)
        create_query = """CREATE TABLE test.{table_name} (
            {fields_str}) ENGINE MergeTree ORDER BY tuple();
        """.format(
            table_name=table_name, fields_str=",".join(fields_strs)
        )
        self.node.query(create_query)
        self.ordered_names = structure.get_ordered_names()
        self.prepared = True

    def load_data(self, data, table_name):
        values_strs = []
        if not data:
            return
        for row in data:
            sorted_row = []
            for name in self.ordered_names:
                row_data = row.data[name]
                if isinstance(row_data, str):
                    row_data = "'" + row_data + "'"
                else:
                    row_data = str(row_data)
                sorted_row.append(row_data)
            values_strs.append("(" + ",".join(sorted_row) + ")")
        query = "INSERT INTO test.{} ({}) values {}".format(
            table_name, ",".join(self.ordered_names), ",".join(values_strs)
        )
        self.node.query(query)


class SourceFile(ExternalSource):
    def get_source_str(self, table_name):
        table_path = "/" + table_name + ".tsv"
        return """
            <file>
                <path>{path}</path>
                <format>TabSeparated</format>
            </file>
        """.format(
            path=table_path,
        )

    def prepare(self, structure, table_name, cluster):
        self.node = cluster.instances[self.docker_hostname]
        path = "/" + table_name + ".tsv"
        self.node.exec_in_container(
            ["bash", "-c", "touch {}".format(path)], user="root"
        )
        self.ordered_names = structure.get_ordered_names()
        self.prepared = True

    def load_data(self, data, table_name):
        if not data:
            return
        path = "/" + table_name + ".tsv"
        for row in list(data):
            sorted_row = []
            for name in self.ordered_names:
                sorted_row.append(str(row.data[name]))

            str_data = "\t".join(sorted_row)
            self.node.exec_in_container(
                [
                    "bash",
                    "-c",
                    'echo "{row}" >> {fname}'.format(row=str_data, fname=path),
                ],
                user="root",
            )

    def compatible_with_layout(self, layout):
        return "cache" not in layout.name and "direct" not in layout.name


class _SourceExecutableBase(ExternalSource):
    def _get_cmd(self, path):
        raise NotImplementedError(
            "Method {} is not implemented for {}".format(
                "_get_cmd", self.__class__.__name__
            )
        )

    def get_source_str(self, table_name):
        table_path = "/" + table_name + ".tsv"
        return """
            <executable>
                <command>{cmd}</command>
                <format>TabSeparated</format>
            </executable>
        """.format(
            cmd=self._get_cmd(table_path),
        )

    def prepare(self, structure, table_name, cluster):
        self.node = cluster.instances[self.docker_hostname]
        path = "/" + table_name + ".tsv"
        self.node.exec_in_container(
            ["bash", "-c", "touch {}".format(path)], user="root"
        )
        self.ordered_names = structure.get_ordered_names()
        self.prepared = True

    def load_data(self, data, table_name):
        if not data:
            return
        path = "/" + table_name + ".tsv"
        for row in list(data):
            sorted_row = []
            for name in self.ordered_names:
                sorted_row.append(str(row.data[name]))

            str_data = "\t".join(sorted_row)
            self.node.exec_in_container(
                [
                    "bash",
                    "-c",
                    'echo "{row}" >> {fname}'.format(row=str_data, fname=path),
                ],
                user="root",
            )


class SourceExecutableHashed(_SourceExecutableBase):
    def _get_cmd(self, path):
        return "cat {}".format(path)

    def compatible_with_layout(self, layout):
        return "hashed" in layout.name


class SourceExecutableCache(_SourceExecutableBase):
    def _get_cmd(self, path):
        return "cat - >/dev/null;cat {}".format(path)

    def compatible_with_layout(self, layout):
        return "cache" in layout.name


class SourceHTTPBase(ExternalSource):
    PORT_COUNTER = 5555

    def get_source_str(self, table_name):
        self.http_port = SourceHTTPBase.PORT_COUNTER
        url = "{schema}://{host}:{port}/".format(
            schema=self._get_schema(), host=self.docker_hostname, port=self.http_port
        )
        SourceHTTPBase.PORT_COUNTER += 1
        return """
            <http>
                <url>{url}</url>
                <format>TabSeparated</format>
                <credentials>
                    <user>foo</user>
                    <password>bar</password>
                </credentials>
                <headers>
                    <header>
                        <name>api-key</name>
                        <value>secret</value>
                    </header>
                </headers>
            </http>
        """.format(
            url=url
        )

    def prepare(self, structure, table_name, cluster):
        self.node = cluster.instances[self.docker_hostname]
        path = "/" + table_name + ".tsv"
        self.node.exec_in_container(
            ["bash", "-c", "touch {}".format(path)], user="root"
        )

        script_dir = os.path.dirname(os.path.realpath(__file__))
        self.node.copy_file_to_container(
            os.path.join(script_dir, "./http_server.py"), "/http_server.py"
        )
        self.node.copy_file_to_container(
            os.path.join(script_dir, "./fake_cert.pem"), "/fake_cert.pem"
        )
        self.node.exec_in_container(
            [
                "bash",
                "-c",
                "python3 /http_server.py --data-path={tbl} --schema={schema} --host={host} --port={port} --cert-path=/fake_cert.pem".format(
                    tbl=path,
                    schema=self._get_schema(),
                    host=self.docker_hostname,
                    port=self.http_port,
                ),
            ],
            detach=True,
        )
        self.ordered_names = structure.get_ordered_names()
        self.prepared = True

    def load_data(self, data, table_name):
        if not data:
            return
        path = "/" + table_name + ".tsv"
        for row in list(data):
            sorted_row = []
            for name in self.ordered_names:
                sorted_row.append(str(row.data[name]))

            str_data = "\t".join(sorted_row)
            self.node.exec_in_container(
                [
                    "bash",
                    "-c",
                    'echo "{row}" >> {fname}'.format(row=str_data, fname=path),
                ],
                user="root",
            )


class SourceHTTP(SourceHTTPBase):
    def _get_schema(self):
        return "http"


class SourceHTTPS(SourceHTTPBase):
    def _get_schema(self):
        return "https"


class SourceCassandra(ExternalSource):
    TYPE_MAPPING = {
        "UInt8": "tinyint",
        "UInt16": "smallint",
        "UInt32": "int",
        "UInt64": "bigint",
        "Int8": "tinyint",
        "Int16": "smallint",
        "Int32": "int",
        "Int64": "bigint",
        "UUID": "uuid",
        "Date": "date",
        "DateTime": "timestamp",
        "String": "text",
        "Float32": "float",
        "Float64": "double",
    }

    def __init__(
        self,
        name,
        internal_hostname,
        internal_port,
        docker_hostname,
        docker_port,
        user,
        password,
    ):
        ExternalSource.__init__(
            self,
            name,
            internal_hostname,
            internal_port,
            docker_hostname,
            docker_port,
            user,
            password,
        )
        self.structure = dict()

    def get_source_str(self, table_name):
        return """
            <cassandra>
                <host>{host}</host>
                <port>{port}</port>
                <keyspace>test</keyspace>
                <column_family>{table}</column_family>
                <allow_filtering>1</allow_filtering>
                <where>"Int64_" &lt; 1000000000000000000</where>
            </cassandra>
        """.format(
            host=self.docker_hostname,
            port=self.docker_port,
            table=table_name,
        )

    def prepare(self, structure, table_name, cluster):
        if self.internal_hostname is None:
            self.internal_hostname = cluster.cassandra_ip

        self.client = cassandra.cluster.Cluster(
            [self.internal_hostname], port=self.internal_port
        )
        self.session = self.client.connect()
        self.session.execute(
            "create keyspace if not exists test with replication = {'class': 'SimpleStrategy', 'replication_factor' : 1};"
        )
        self.session.execute('drop table if exists test."{}"'.format(table_name))
        self.structure[table_name] = structure
        columns = [
            '"' + col.name + '" ' + self.TYPE_MAPPING[col.field_type]
            for col in structure.get_all_fields()
        ]
        keys = ['"' + col.name + '"' for col in structure.keys]
        query = 'create table test."{name}" ({columns}, primary key ({pk}));'.format(
            name=table_name, columns=", ".join(columns), pk=", ".join(keys)
        )
        self.session.execute(query)
        self.prepared = True

    def get_value_to_insert(self, value, type):
        if type == "UUID":
            return uuid.UUID(value)
        elif type == "DateTime":
            return datetime.datetime.strptime(value, "%Y-%m-%d %H:%M:%S")
        return value

    def load_data(self, data, table_name):
        names_and_types = [
            (field.name, field.field_type)
            for field in self.structure[table_name].get_all_fields()
        ]
        columns = ['"' + col[0] + '"' for col in names_and_types]
        insert = 'insert into test."{table}" ({columns}) values ({args})'.format(
            table=table_name,
            columns=",".join(columns),
            args=",".join(["%s"] * len(columns)),
        )
        for row in data:
            values = [
                self.get_value_to_insert(row.get_value_by_name(col[0]), col[1])
                for col in names_and_types
            ]
            self.session.execute(insert, values)


class SourceRedis(ExternalSource):
    def __init__(
        self,
        name,
        internal_hostname,
        internal_port,
        docker_hostname,
        docker_port,
        user,
        password,
        db_index,
        storage_type,
    ):
        super(SourceRedis, self).__init__(
            name,
            internal_hostname,
            internal_port,
            docker_hostname,
            docker_port,
            user,
            password,
        )
        self.storage_type = storage_type
        self.db_index = db_index

    def get_source_str(self, table_name):
        return """
            <redis>
                <host>{host}</host>
                <port>{port}</port>
                <password>{password}</password>
                <db_index>{db_index}</db_index>
                <storage_type>{storage_type}</storage_type>
            </redis>
        """.format(
            host=self.docker_hostname,
            port=self.docker_port,
            password=self.password,
            storage_type=self.storage_type,  # simple or hash_map
            db_index=self.db_index,
        )

    def prepare(self, structure, table_name, cluster):
        self.client = redis.StrictRedis(
            host=self.internal_hostname,
            port=self.internal_port,
            db=self.db_index,
            password=self.password or None,
        )
        self.prepared = True
        self.ordered_names = structure.get_ordered_names()

    def load_data(self, data, table_name):
        self.client.flushdb()
        for row in list(data):
            values = []
            for name in self.ordered_names:
                values.append(str(row.data[name]))
            if len(values) == 2:
                self.client.set(*values)
            else:
                self.client.hset(*values)

    def compatible_with_layout(self, layout):
        return (
            layout.is_simple
            and self.storage_type == "simple"
            or layout.is_complex
            and self.storage_type == "hash_map"
        )