#!/usr/bin/env python3

# Copyright Materialize, Inc. and contributors. All rights reserved.
#
# Use of this software is governed by the Business Source License
# included in the LICENSE file at the root of this repository.
#
# 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.

import argparse
import re
from typing import Any

from materialize.buildkite_insights.artifact_search.artifact_search_presentation import (
    print_artifact_match,
    print_before_search_results,
    print_summary,
)
from materialize.buildkite_insights.buildkite_api.buildkite_config import MZ_PIPELINES
from materialize.buildkite_insights.buildkite_api.generic_api import RateLimitExceeded
from materialize.buildkite_insights.cache import (
    artifacts_cache,
    builds_cache,
    logs_cache,
)
from materialize.buildkite_insights.cache.cache_constants import (
    FETCH_MODE_CHOICES,
    FetchMode,
)
from materialize.buildkite_insights.util.build_step_utils import (
    extract_build_step_names_by_job_id,
)
from materialize.buildkite_insights.util.search_utility import (
    _search_value_to_pattern,
    determine_line_number,
    determine_position_in_line,
)

ACCEPTED_FILE_ENDINGS = {"log", "txt", "xml", "zst"}


def main(
    pipeline_slug: str,
    build_number: int,
    specified_job_id: str | None,
    pattern: str,
    fetch: FetchMode,
    max_results: int,
    use_regex: bool,
    file_name_regex: str | None,
    include_zst_files: bool,
    search_logs_instead_of_artifacts: bool,
) -> None:
    assert len(pattern) > 0, "pattern must not be empty"

    if specified_job_id is not None:
        build_step_name_by_job_id = dict()
        build_step_name_by_job_id[specified_job_id] = "(unknown)"
    else:
        build = builds_cache.get_or_query_single_build(
            pipeline_slug, fetch, build_number=build_number
        )
        build_step_name_by_job_id = extract_build_step_names_by_job_id(build)

    try:
        (
            count_matches,
            count_all_artifacts,
            ignored_file_names,
            max_search_results_hit,
        ) = (
            _search_logs(
                pipeline_slug=pipeline_slug,
                build_number=build_number,
                pattern=pattern,
                fetch=fetch,
                max_results=max_results,
                use_regex=use_regex,
                build_step_name_by_job_id=build_step_name_by_job_id,
            )
            if search_logs_instead_of_artifacts
            else _search_artifacts(
                pipeline_slug=pipeline_slug,
                build_number=build_number,
                pattern=pattern,
                fetch=fetch,
                max_results=max_results,
                use_regex=use_regex,
                file_name_regex=file_name_regex,
                include_zst_files=include_zst_files,
                build_step_name_by_job_id=build_step_name_by_job_id,
            )
        )

    except RateLimitExceeded:
        print("Aborting due to exceeded rate limit!")
        return

    print_summary(
        pipeline_slug=pipeline_slug,
        build_number=build_number,
        job_id=specified_job_id,
        count_artifacts=count_all_artifacts,
        count_matches=count_matches,
        ignored_file_names=ignored_file_names,
        max_search_results_hit=max_search_results_hit,
    )


def _search_artifacts(
    pipeline_slug: str,
    build_number: int,
    pattern: str,
    fetch: FetchMode,
    max_results: int,
    use_regex: bool,
    file_name_regex: str | None,
    include_zst_files: bool,
    build_step_name_by_job_id: dict[str, str],
) -> tuple[int, int, set[str], bool]:
    """
    :return: count_matches, count_all_artifacts, ignored_file_names, max_search_results_hit
    """
    artifact_list_by_job_id: dict[str, list[Any]] = dict()
    for job_id in build_step_name_by_job_id.keys():
        artifact_list_by_job_id[job_id] = (
            artifacts_cache.get_or_query_job_artifact_list(
                pipeline_slug, fetch, build_number=build_number, job_id=job_id
            )
        )

    print_before_search_results()

    count_matches = 0
    count_all_artifacts = 0
    ignored_file_names = set()
    max_search_results_hit = False

    for job_id, artifact_list in artifact_list_by_job_id.items():
        artifact_list = _filter_artifact_list(artifact_list, file_name_regex)
        count_artifacts_of_job = len(artifact_list)
        build_step_name = build_step_name_by_job_id[job_id]

        if count_artifacts_of_job == 0:
            print(f"Skipping job '{build_step_name}' ({job_id}) without artifacts.")
            continue

        print(
            f"Searching {count_artifacts_of_job} artifacts of job '{build_step_name}' ({job_id})."
        )
        count_all_artifacts = count_all_artifacts + count_artifacts_of_job

        for artifact in artifact_list:
            max_entries_to_print = max(0, max_results - count_matches)
            if max_entries_to_print == 0:
                max_search_results_hit = True
                break

            artifact_id = artifact["id"]
            artifact_file_name = artifact["filename"]

            if not _can_search_artifact(artifact_file_name, include_zst_files):
                print(f"Skipping artifact {artifact_file_name} due to file ending!")
                ignored_file_names.add(artifact_file_name)
                continue

            artifact_content = artifacts_cache.get_or_download_artifact(
                pipeline_slug,
                fetch,
                build_number=build_number,
                job_id=job_id,
                artifact_id=artifact_id,
                is_zst_compressed=is_zst_file(artifact_file_name),
            )

            matches_in_artifact, max_search_results_hit = _search_artifact_content(
                artifact_file_name=artifact_file_name,
                artifact_content=artifact_content,
                pattern=pattern,
                use_regex=use_regex,
                max_entries_to_print=max_entries_to_print,
            )

            count_matches = count_matches + matches_in_artifact

    return (
        count_matches,
        count_all_artifacts,
        ignored_file_names,
        max_search_results_hit,
    )


def _filter_artifact_list(
    artifact_list: list[Any], file_name_regex: str | None
) -> list[Any]:
    if file_name_regex is None:
        return artifact_list

    filtered_list = []

    for artifact in artifact_list:
        artifact_file_name = artifact["filename"]
        if re.search(file_name_regex, artifact_file_name):
            filtered_list.append(artifact)

    return filtered_list


def _search_logs(
    pipeline_slug: str,
    build_number: int,
    pattern: str,
    fetch: FetchMode,
    max_results: int,
    use_regex: bool,
    build_step_name_by_job_id: dict[str, str],
) -> tuple[int, int, set[str], bool]:
    """
    :return: count_matches, count_all_artifacts, ignored_file_names, max_search_results_hit
    """

    print_before_search_results()

    count_matches = 0
    count_all_artifacts = 0
    ignored_file_names = set()
    max_search_results_hit = False

    for job_id, build_step_name in build_step_name_by_job_id.items():
        print(f"Searching log of job '{build_step_name}' ({job_id}).")
        count_all_artifacts = count_all_artifacts + 1

        max_entries_to_print = max(0, max_results - count_matches)
        if max_entries_to_print == 0:
            max_search_results_hit = True
            break

        log_content = logs_cache.get_or_download_log(
            pipeline_slug,
            fetch,
            build_number=build_number,
            job_id=job_id,
        )

        matches_in_log, max_search_results_hit = _search_artifact_content(
            artifact_file_name="log",
            artifact_content=log_content,
            pattern=pattern,
            use_regex=use_regex,
            max_entries_to_print=max_entries_to_print,
        )

        count_matches = count_matches + matches_in_log

    return (
        count_matches,
        count_all_artifacts,
        ignored_file_names,
        max_search_results_hit,
    )


def _can_search_artifact(artifact_file_name: str, include_zst_files: bool) -> bool:
    if not include_zst_files and is_zst_file(artifact_file_name):
        return False

    for file_ending in ACCEPTED_FILE_ENDINGS:
        if artifact_file_name.endswith(f".{file_ending}"):
            return True

    return False


def _search_artifact_content(
    artifact_file_name: str,
    artifact_content: str,
    pattern: str,
    use_regex: bool,
    max_entries_to_print: int,
) -> tuple[int, bool]:
    """
    :return: number of highlighted results and whether further matches exceeding max_entries_to_print exist
    """
    search_pattern = _search_value_to_pattern(pattern, use_regex)

    search_offset = 0
    match_count = 0

    while True:
        match = search_pattern.search(artifact_content, pos=search_offset)

        if match is None:
            break

        match_count = match_count + 1

        line_number = determine_line_number(artifact_content, position=match.start())
        position_in_line = determine_position_in_line(
            artifact_content, position=match.start()
        )

        print_artifact_match(
            file_name=artifact_file_name,
            line_number=line_number,
            position_in_line=position_in_line,
            content=artifact_content,
            search_value=pattern,
            use_regex=use_regex,
            search_offset=search_offset,
        )

        search_offset = match.end()

        if match_count >= max_entries_to_print:
            return match_count, True

    return match_count, False


def is_zst_file(file_name: str) -> bool:
    return file_name.endswith(".zst")


if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        prog="buildkite-artifact-search",
        formatter_class=argparse.RawDescriptionHelpFormatter,
    )

    parser.add_argument(
        "pipeline",
        choices=MZ_PIPELINES,
        type=str,
    )

    # no hyphen because positionals with hyphen cause issues
    parser.add_argument(
        "buildnumber",
        type=int,
    )

    parser.add_argument("pattern", type=str)

    parser.add_argument("--job-id", type=str)

    parser.add_argument("--max-results", default=50, type=int)
    parser.add_argument(
        "--use-regex",
        action="store_true",
    )
    parser.add_argument("--file-name-regex", type=str)
    parser.add_argument(
        "--include-zst-files", action=argparse.BooleanOptionalAction, default=True
    )
    parser.add_argument(
        "--search-logs-instead-of-artifacts",
        default=False,
        action="store_true",
    )
    parser.add_argument(
        "--fetch",
        type=lambda mode: FetchMode[mode.upper()],
        choices=FETCH_MODE_CHOICES,
        default=FetchMode.AUTO,
        help="Whether to fetch fresh builds from Buildkite.",
    )

    args = parser.parse_args()

    main(
        args.pipeline,
        args.buildnumber,
        args.job_id,
        args.pattern,
        args.fetch,
        args.max_results,
        args.use_regex,
        args.file_name_regex,
        args.include_zst_files,
        args.search_logs_instead_of_artifacts,
    )