#  Licensed to Elasticsearch B.V. under one or more contributor
#  license agreements. See the NOTICE file distributed with
#  this work for additional information regarding copyright
#  ownership. Elasticsearch B.V. 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
#  specific language governing permissions and limitations
#  under the License.

import os
import subprocess
import sys
from glob import glob
from pathlib import Path

import unasync


def cleanup(source_dir: Path, output_dir: Path, patterns: list[str]):
    for file in glob("*.py", root_dir=source_dir):
        path = output_dir / file
        for pattern in patterns:
            subprocess.check_call(["sed", "-i.bak", pattern, str(path)])
        subprocess.check_call(["rm", f"{path}.bak"])


def run(
    rule: unasync.Rule,
    cleanup_patterns: list[str] = [],
    check: bool = False,
):
    root_dir = Path(__file__).absolute().parent.parent
    source_dir = root_dir / rule.fromdir.lstrip("/")
    output_dir = check_dir = root_dir / rule.todir.lstrip("/")
    if check:
        rule.todir += "_sync_check/"
        output_dir = root_dir / rule.todir.lstrip("/")

    filepaths = []
    for root, _, filenames in os.walk(source_dir):
        for filename in filenames:
            if filename.rpartition(".")[-1] in {
                "py",
                "pyi",
            } and not filename.startswith("utils.py"):
                filepaths.append(os.path.join(root, filename))

    unasync.unasync_files(filepaths, [rule])

    if cleanup_patterns:
        cleanup(source_dir, output_dir, cleanup_patterns)

    if check:
        subprocess.check_call(["black", output_dir])
        subprocess.check_call(["isort", "--profile=black", output_dir])

        # make sure there are no differences between _sync and _sync_check
        for file in glob("*.py", root_dir=output_dir):
            subprocess.check_call(
                [
                    "diff",
                    f"{check_dir}/{file}",
                    f"{output_dir}/{file}",
                ]
            )
        subprocess.check_call(["rm", "-rf", output_dir])


def main(check: bool = False):
    run(
        rule=unasync.Rule(
            fromdir="/elasticsearch/_async/client/",
            todir="/elasticsearch/_sync/client/",
            additional_replacements={
                # We want to rewrite to 'Transport' instead of 'SyncTransport', etc
                "AsyncTransport": "Transport",
                "AsyncElasticsearch": "Elasticsearch",
                # We don't want to rewrite this class
                "AsyncSearchClient": "AsyncSearchClient",
                # Handling typing.Awaitable[...] isn't done yet by unasync.
                "_TYPE_ASYNC_SNIFF_CALLBACK": "_TYPE_SYNC_SNIFF_CALLBACK",
            },
        ),
        check=check,
    )

    run(
        rule=unasync.Rule(
            fromdir="elasticsearch/helpers/vectorstore/_async/",
            todir="elasticsearch/helpers/vectorstore/_sync/",
            additional_replacements={
                "AsyncBM25Strategy": "BM25Strategy",
                "AsyncDenseVectorStrategy": "DenseVectorStrategy",
                "AsyncDenseVectorScriptScoreStrategy": "DenseVectorScriptScoreStrategy",
                "AsyncElasticsearch": "Elasticsearch",
                "AsyncElasticsearchEmbeddings": "ElasticsearchEmbeddings",
                "AsyncEmbeddingService": "EmbeddingService",
                "AsyncRetrievalStrategy": "RetrievalStrategy",
                "AsyncSparseVectorStrategy": "SparseVectorStrategy",
                "AsyncTransport": "Transport",
                "AsyncVectorStore": "VectorStore",
                "async_bulk": "bulk",
                "_async": "_sync",
            },
        ),
        cleanup_patterns=[
            "/^import asyncio$/d",
        ],
        check=check,
    )


if __name__ == "__main__":
    main(check="--check" in sys.argv)