# Copyright 2022 Memgraph Ltd.
#
# Use of this software is governed by the Business Source License
# included in the file licenses/BSL.txt; by using this file, you agree to be bound by the terms of the Business Source
# License, and you may not use this file except in compliance with the Business Source License.
#
# As of the Change Date specified in that file, in accordance with
# the Business Source License, use of this software will be governed
# by the Apache License, Version 2.0, included in the file
# licenses/APL.txt.

from abc import ABC, abstractclassmethod
from pathlib import Path

import helpers
from benchmark_context import BenchmarkContext


# Base dataset class used as a template to create each individual dataset. All
# common logic is handled here.
class Workload(ABC):

    # Name of the workload/dataset.
    NAME = ""
    # List of all variants of the workload/dataset that exist.
    VARIANTS = ["default"]
    # One of the available variants that should be used as the default variant.
    DEFAULT_VARIANT = "default"

    # List of local files that should be used to import the dataset.
    LOCAL_FILE = None

    # URLs of remote dataset files that should be used to import the dataset, compressed in gz format.
    URL_FILE = None

    # Index files
    LOCAL_INDEX_FILE = None
    URL_INDEX_FILE = None

    # Number of vertices/edges for each variant.
    SIZES = {
        "default": {"vertices": 0, "edges": 0},
    }

    # Indicates whether the dataset has properties on edges.
    PROPERTIES_ON_EDGES = False

    def __init_subclass__(cls) -> None:
        name_prerequisite = "NAME" in cls.__dict__
        generator_prerequisite = "dataset_generator" in cls.__dict__
        custom_import_prerequisite = "custom_import" in cls.__dict__
        basic_import_prerequisite = ("LOCAL_FILE" in cls.__dict__ or "URL_FILE" in cls.__dict__) and (
            "LOCAL_INDEX_FILE" in cls.__dict__ or "URL_INDEX_FILE" in cls.__dict__
        )

        if not name_prerequisite:
            raise ValueError(
                """Can't define a workload class {} without NAME property:
                                NAME = "dataset name"
                                Name property defines the workload you want to execute, for example: "demo/*/*/*"
                            """.format(
                    cls.__name__
                )
            )

        # Check workload is in generator or dataset mode during interpretation (not both), not runtime
        if generator_prerequisite and (custom_import_prerequisite or basic_import_prerequisite):
            raise ValueError(
                """
                                The workload class {} cannot have defined dataset import and generate dataset at
                                the same time.
                                 """.format(
                    cls.__name__
                )
            )

        if not generator_prerequisite and (not custom_import_prerequisite and not basic_import_prerequisite):
            raise ValueError(
                """
                                The workload class {} need to have defined dataset import or dataset generator
                                """.format(
                    cls.__name__
                )
            )

        return super().__init_subclass__()

    def __init__(self, variant: str = None, benchmark_context: BenchmarkContext = None):
        """
        Accepts a `variant` variable that indicates which variant
        of the dataset should be executed
        """
        self.benchmark_context = benchmark_context
        self._variant = variant
        self._vendor = benchmark_context.vendor_name
        self._file = None
        self._file_index = None

        if self.NAME == "":
            raise ValueError("Give your workload a name, by setting self.NAME")

        if variant is None:
            variant = self.DEFAULT_VARIANT
        if variant not in self.VARIANTS:
            raise ValueError("Invalid test variant!")
        if (self.LOCAL_FILE and variant not in self.LOCAL_FILE) and (self.URL_FILE and variant not in self.URL_FILE):
            raise ValueError("The variant doesn't have a defined URL or LOCAL file path!")
        if variant not in self.SIZES:
            raise ValueError("The variant doesn't have a defined dataset " "size!")

        if (self.LOCAL_INDEX_FILE and self._vendor not in self.LOCAL_INDEX_FILE) and (
            self.URL_INDEX_FILE and self._vendor not in self.URL_INDEX_FILE
        ):
            raise ValueError("Vendor does not have INDEX for dataset!")

        if self.LOCAL_FILE is not None:
            self._local_file = self.LOCAL_FILE.get(variant, None)
        else:
            self._local_file = None

        if self.URL_FILE is not None:
            self._url_file = self.URL_FILE.get(variant, None)
        else:
            self._url_file = None

        if self.LOCAL_INDEX_FILE is not None:
            self._local_index = self.LOCAL_INDEX_FILE.get(self._vendor, None)
        else:
            self._local_index = None

        if self.URL_INDEX_FILE is not None:
            self._url_index = self.URL_INDEX_FILE.get(self._vendor, None)
        else:
            self._url_index = None

        self._size = self.SIZES[variant]
        if "vertices" in self._size or "edges" in self._size:
            self._num_vertices = self._size["vertices"]
            self._num_edges = self._size["edges"]

    def prepare(self, directory):
        if self._local_file is not None:
            print("Using local dataset file:", self._local_file)
            self._file = self._local_file
        elif self._url_file is not None:
            cached_input, exists = directory.get_file("dataset.cypher")
            if not exists:
                print("Downloading dataset file:", self._url_file)
                downloaded_file = helpers.download_file(self._url_file, directory.get_path())
                print("Unpacking and caching file:", downloaded_file)
                helpers.unpack_gz_and_move_file(downloaded_file, cached_input)
            print("Using cached dataset file:", cached_input)
            self._file = cached_input

        if self._local_index is not None:
            print("Using local index file:", self._local_index)
            self._file_index = self._local_index
        elif self._url_index is not None:
            cached_index, exists = directory.get_file(self._vendor + ".cypher")
            if not exists:
                print("Downloading index file:", self._url_index)
                downloaded_file = helpers.download_file(self._url_index, directory.get_path())
                print("Unpacking and caching file:", downloaded_file)
                helpers.unpack_gz_and_move_file(downloaded_file, cached_index)
            print("Using cached index file:", cached_index)
            self._file_index = cached_index

    def get_variant(self):
        """Returns the current variant of the dataset."""
        return self._variant

    def get_index(self):
        """Get index file, defined by vendor"""
        return self._file_index

    def get_file(self):
        """
        Returns path to the file that contains dataset creation queries.
        """
        return self._file

    def get_size(self):
        """Returns number of vertices/edges for the current variant."""
        return self._size

    def custom_import(self) -> bool:
        print("Workload does not have a custom import")
        return False

    def dataset_generator(self) -> list:
        print("Workload is not auto generated")
        return []

    # All tests should be query generator functions that output all of the
    # queries that should be executed by the runner. The functions should be
    # named `benchmark__GROUPNAME__TESTNAME` and should not accept any
    # arguments.