from __future__ import unicode_literals

import json

from moto.core.responses import BaseResponse
from .models import glue_backend
from .exceptions import (
    PartitionAlreadyExistsException,
    PartitionNotFoundException,
    TableNotFoundException,
)


class GlueResponse(BaseResponse):
    @property
    def glue_backend(self):
        return glue_backend

    @property
    def parameters(self):
        return json.loads(self.body)

    def create_database(self):
        database_name = self.parameters["DatabaseInput"]["Name"]
        self.glue_backend.create_database(database_name)
        return ""

    def get_database(self):
        database_name = self.parameters.get("Name")
        database = self.glue_backend.get_database(database_name)
        return json.dumps({"Database": {"Name": database.name}})

    def get_databases(self):
        database_list = self.glue_backend.get_databases()
        return json.dumps(
            {"DatabaseList": [{"Name": database.name} for database in database_list]}
        )

    def create_table(self):
        database_name = self.parameters.get("DatabaseName")
        table_input = self.parameters.get("TableInput")
        table_name = table_input.get("Name")
        self.glue_backend.create_table(database_name, table_name, table_input)
        return ""

    def get_table(self):
        database_name = self.parameters.get("DatabaseName")
        table_name = self.parameters.get("Name")
        table = self.glue_backend.get_table(database_name, table_name)

        return json.dumps({"Table": table.as_dict()})

    def update_table(self):
        database_name = self.parameters.get("DatabaseName")
        table_input = self.parameters.get("TableInput")
        table_name = table_input.get("Name")
        table = self.glue_backend.get_table(database_name, table_name)
        table.update(table_input)
        return ""

    def get_table_versions(self):
        database_name = self.parameters.get("DatabaseName")
        table_name = self.parameters.get("TableName")
        table = self.glue_backend.get_table(database_name, table_name)

        return json.dumps(
            {
                "TableVersions": [
                    {"Table": table.as_dict(version=n), "VersionId": str(n + 1)}
                    for n in range(len(table.versions))
                ]
            }
        )

    def get_table_version(self):
        database_name = self.parameters.get("DatabaseName")
        table_name = self.parameters.get("TableName")
        table = self.glue_backend.get_table(database_name, table_name)
        ver_id = self.parameters.get("VersionId")

        return json.dumps(
            {
                "TableVersion": {
                    "Table": table.as_dict(version=ver_id),
                    "VersionId": ver_id,
                }
            }
        )

    def get_tables(self):
        database_name = self.parameters.get("DatabaseName")
        tables = self.glue_backend.get_tables(database_name)
        return json.dumps({"TableList": [table.as_dict() for table in tables]})

    def delete_table(self):
        database_name = self.parameters.get("DatabaseName")
        table_name = self.parameters.get("Name")
        resp = self.glue_backend.delete_table(database_name, table_name)
        return json.dumps(resp)

    def batch_delete_table(self):
        database_name = self.parameters.get("DatabaseName")

        errors = []
        for table_name in self.parameters.get("TablesToDelete"):
            try:
                self.glue_backend.delete_table(database_name, table_name)
            except TableNotFoundException:
                errors.append(
                    {
                        "TableName": table_name,
                        "ErrorDetail": {
                            "ErrorCode": "EntityNotFoundException",
                            "ErrorMessage": "Table not found",
                        },
                    }
                )

        out = {}
        if errors:
            out["Errors"] = errors

        return json.dumps(out)

    def get_partitions(self):
        database_name = self.parameters.get("DatabaseName")
        table_name = self.parameters.get("TableName")
        if "Expression" in self.parameters:
            raise NotImplementedError(
                "Expression filtering in get_partitions is not implemented in moto"
            )
        table = self.glue_backend.get_table(database_name, table_name)

        return json.dumps({"Partitions": [p.as_dict() for p in table.get_partitions()]})

    def get_partition(self):
        database_name = self.parameters.get("DatabaseName")
        table_name = self.parameters.get("TableName")
        values = self.parameters.get("PartitionValues")

        table = self.glue_backend.get_table(database_name, table_name)

        p = table.get_partition(values)

        return json.dumps({"Partition": p.as_dict()})

    def batch_get_partition(self):
        database_name = self.parameters.get("DatabaseName")
        table_name = self.parameters.get("TableName")
        partitions_to_get = self.parameters.get("PartitionsToGet")

        table = self.glue_backend.get_table(database_name, table_name)

        partitions = []
        for values in partitions_to_get:
            try:
                p = table.get_partition(values=values["Values"])
                partitions.append(p.as_dict())
            except PartitionNotFoundException:
                continue

        return json.dumps({"Partitions": partitions})

    def create_partition(self):
        database_name = self.parameters.get("DatabaseName")
        table_name = self.parameters.get("TableName")
        part_input = self.parameters.get("PartitionInput")

        table = self.glue_backend.get_table(database_name, table_name)
        table.create_partition(part_input)

        return ""

    def batch_create_partition(self):
        database_name = self.parameters.get("DatabaseName")
        table_name = self.parameters.get("TableName")
        table = self.glue_backend.get_table(database_name, table_name)

        errors_output = []
        for part_input in self.parameters.get("PartitionInputList"):
            try:
                table.create_partition(part_input)
            except PartitionAlreadyExistsException:
                errors_output.append(
                    {
                        "PartitionValues": part_input["Values"],
                        "ErrorDetail": {
                            "ErrorCode": "AlreadyExistsException",
                            "ErrorMessage": "Partition already exists.",
                        },
                    }
                )

        out = {}
        if errors_output:
            out["Errors"] = errors_output

        return json.dumps(out)

    def update_partition(self):
        database_name = self.parameters.get("DatabaseName")
        table_name = self.parameters.get("TableName")
        part_input = self.parameters.get("PartitionInput")
        part_to_update = self.parameters.get("PartitionValueList")

        table = self.glue_backend.get_table(database_name, table_name)
        table.update_partition(part_to_update, part_input)

        return ""

    def delete_partition(self):
        database_name = self.parameters.get("DatabaseName")
        table_name = self.parameters.get("TableName")
        part_to_delete = self.parameters.get("PartitionValues")

        table = self.glue_backend.get_table(database_name, table_name)
        table.delete_partition(part_to_delete)

        return ""

    def batch_delete_partition(self):
        database_name = self.parameters.get("DatabaseName")
        table_name = self.parameters.get("TableName")
        table = self.glue_backend.get_table(database_name, table_name)

        errors_output = []
        for part_input in self.parameters.get("PartitionsToDelete"):
            values = part_input.get("Values")
            try:
                table.delete_partition(values)
            except PartitionNotFoundException:
                errors_output.append(
                    {
                        "PartitionValues": values,
                        "ErrorDetail": {
                            "ErrorCode": "EntityNotFoundException",
                            "ErrorMessage": "Partition not found",
                        },
                    }
                )

        out = {}
        if errors_output:
            out["Errors"] = errors_output

        return json.dumps(out)