import argparse
import json
import os
import time
import zipfile

from get_ci_error_statistics import download_artifact, get_artifacts_links
from transformers import logging


logger = logging.get_logger(__name__)


def extract_warnings_from_single_artifact(artifact_path, targets):
    """Extract warnings from a downloaded artifact (in .zip format)"""
    selected_warnings = set()
    buffer = []

    def parse_line(fp):
        for line in fp:
            if isinstance(line, bytes):
                line = line.decode("UTF-8")
            if "warnings summary (final)" in line:
                continue
            # This means we are outside the body of a warning
            elif not line.startswith(" "):
                # process a single warning and move it to `selected_warnings`.
                if len(buffer) > 0:
                    warning = "\n".join(buffer)
                    # Only keep the warnings specified in `targets`
                    if any(f": {x}: " in warning for x in targets):
                        selected_warnings.add(warning)
                    buffer.clear()
                continue
            else:
                line = line.strip()
                buffer.append(line)

    if from_gh:
        for filename in os.listdir(artifact_path):
            file_path = os.path.join(artifact_path, filename)
            if not os.path.isdir(file_path):
                # read the file
                if filename != "warnings.txt":
                    continue
                with open(file_path) as fp:
                    parse_line(fp)
    else:
        try:
            with zipfile.ZipFile(artifact_path) as z:
                for filename in z.namelist():
                    if not os.path.isdir(filename):
                        # read the file
                        if filename != "warnings.txt":
                            continue
                        with z.open(filename) as fp:
                            parse_line(fp)
        except Exception:
            logger.warning(
                f"{artifact_path} is either an invalid zip file or something else wrong. This file is skipped."
            )

    return selected_warnings


def extract_warnings(artifact_dir, targets):
    """Extract warnings from all artifact files"""

    selected_warnings = set()

    paths = [os.path.join(artifact_dir, p) for p in os.listdir(artifact_dir) if (p.endswith(".zip") or from_gh)]
    for p in paths:
        selected_warnings.update(extract_warnings_from_single_artifact(p, targets))

    return selected_warnings


if __name__ == "__main__":

    def list_str(values):
        return values.split(",")

    parser = argparse.ArgumentParser()
    # Required parameters
    parser.add_argument(
        "--workflow_run_id", default=None, type=str, required=True, help="A GitHub Actions workflow run id."
    )
    parser.add_argument(
        "--output_dir",
        default=None,
        type=str,
        required=True,
        help="Where to store the downloaded artifacts and other result files.",
    )
    parser.add_argument(
        "--token", default=None, type=str, required=True, help="A token that has actions:read permission."
    )
    # optional parameters
    parser.add_argument(
        "--targets",
        default="DeprecationWarning,UserWarning,FutureWarning",
        type=list_str,
        help="Comma-separated list of target warning(s) which we want to extract.",
    )
    parser.add_argument(
        "--from_gh",
        action="store_true",
        help="If running from a GitHub action workflow and collecting warnings from its artifacts.",
    )

    args = parser.parse_args()

    from_gh = args.from_gh
    if from_gh:
        # The artifacts have to be downloaded using `actions/download-artifact@v2`
        pass
    else:
        os.makedirs(args.output_dir, exist_ok=True)

        # get download links
        artifacts = get_artifacts_links(args.workflow_run_id)
        with open(os.path.join(args.output_dir, "artifacts.json"), "w", encoding="UTF-8") as fp:
            json.dump(artifacts, fp, ensure_ascii=False, indent=4)

        # download artifacts
        for idx, (name, url) in enumerate(artifacts.items()):
            print(name)
            print(url)
            print("=" * 80)
            download_artifact(name, url, args.output_dir, args.token)
            # Be gentle to GitHub
            time.sleep(1)

    # extract warnings from artifacts
    selected_warnings = extract_warnings(args.output_dir, args.targets)
    selected_warnings = sorted(list(selected_warnings))
    with open(os.path.join(args.output_dir, "selected_warnings.json"), "w", encoding="UTF-8") as fp:
        json.dump(selected_warnings, fp, ensure_ascii=False, indent=4)
