# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.
# pylint: disable=missing-docstring

import os
import re
import shutil
import subprocess
import sys
import tempfile
from argparse import ArgumentParser
from typing import Any

from wptrunner import wptcommandline  # noqa: F401
from wptrunner.update import WPTUpdate, setup_logging  # noqa: F401
from wptrunner.update.base import exit_unclean  # noqa: F401

from . import WPT_PATH, manifestupdate

TEST_ROOT = os.path.join(WPT_PATH, "tests")
META_ROOTS = [os.path.join(WPT_PATH, "meta"), os.path.join(WPT_PATH, "meta-legacy")]
GITHUB_ACTION_RUN_URL_REGEX = re.compile(r"github\.com\/(\w+\/\w+)\/actions\/runs\/(\d+)$")


def do_sync(**kwargs: str) -> int:
    last_commit = subprocess.check_output(["git", "log", "-1"])

    # Commits should always be authored by the GitHub Actions bot.
    os.environ["GIT_AUTHOR_NAME"] = "Servo WPT Sync"
    os.environ["GIT_AUTHOR_EMAIL"] = "ghbot+wpt-sync@servo.org"
    os.environ["GIT_COMMITTER_NAME"] = os.environ["GIT_AUTHOR_NAME"]
    os.environ["GIT_COMMITTER_EMAIL"] = os.environ["GIT_AUTHOR_EMAIL"]

    print("Updating WPT from upstream...")
    run_update(**kwargs)

    if last_commit == subprocess.check_output(["git", "log", "-1"]):
        return 255

    # Update the manifest twice to reach a fixed state
    # (https://github.com/servo/servo/issues/22275).
    print("Updating test manifests...")
    manifestupdate.update(check_clean=False)
    manifestupdate.update(check_clean=False)

    remove_unused_metadata()

    if subprocess.check_call(["git", "commit", "-a", "--amend", "--no-edit", "-q"]) != 0:
        print("Ammending commit failed. Bailing out.")
        return 1

    return 0


def remove_unused_metadata() -> None:
    print("Removing unused results...")
    unused_files = []
    unused_dirs = []

    for meta_root in META_ROOTS:
        for base_dir, dir_names, files in os.walk(meta_root):
            # Skip recursing into any directories that were previously found to be missing.
            if any([os.path.commonpath([base_dir, unused_dir]) == unused_dir for unused_dir in unused_dirs]):
                continue

            for dir_name in dir_names:
                dir_path = os.path.join(base_dir, dir_name)

                # Skip any known directories that are meta-metadata.
                if dir_name == ".cache":
                    unused_dirs.append(dir_path)
                    continue

                # Turn tests/wpt/meta/foo into tests/wpt/tests/foo.
                test_dir = os.path.join(TEST_ROOT, os.path.relpath(dir_path, meta_root))
                if not os.path.exists(test_dir):
                    unused_dirs.append(dir_path)

            for fname in files:
                # Skip any known files that are meta-metadata.
                if not fname.endswith(".ini") or fname == "__dir__.ini":
                    continue

                # Turn tests/wpt/meta/foo/bar.html.ini into tests/wpt/tests/foo/bar.html.
                test_file = os.path.join(TEST_ROOT, os.path.relpath(base_dir, meta_root), fname[:-4])

                if not os.path.exists(test_file):
                    unused_files.append(os.path.join(base_dir, fname))

    for file in unused_files:
        print(f"    - {file}")
        os.remove(file)
    for directory in unused_dirs:
        print(f"    - {directory}")
        shutil.rmtree(directory)


def update_tests(**kwargs: Any) -> int:
    def set_if_none(args: dict, key: str, value: str) -> None:
        if key not in args or args[key] is None:
            args[key] = value

    set_if_none(kwargs, "config", os.path.join(WPT_PATH, "config.ini"))
    kwargs["product"] = "servo"
    kwargs["store_state"] = False

    wptcommandline.set_from_config(kwargs)
    if hasattr(wptcommandline, "check_paths"):
        wptcommandline.check_paths(kwargs["test_paths"])

    if kwargs.get("sync", False):
        return do_sync(**kwargs)

    return 0 if run_update(**kwargs) else 1


def run_update(**kwargs: Any) -> bool:
    """Run the update process returning True if the process is successful."""
    run_logs: list[str] = kwargs.get("run_log", "")
    if any([GITHUB_ACTION_RUN_URL_REGEX.search(run_log) for run_log in run_logs]):
        return download_run_results_and_then_run_update(kwargs)

    logger = setup_logging(kwargs, {"mach": sys.stdout})
    return WPTUpdate(logger, **kwargs).run() != exit_unclean


def download_run_results_and_then_run_update(kwargs: dict[str, Any]) -> bool:
    """If any of the arguments passed to `./mach update-wpt` are URLs, attempt to
    interpret them as GitHub Action Run URLs and download any test results, passing
    the downloaded results as the input to the WPT metadata update."""
    run_logs: list[str] = kwargs.get("run_log", "")
    with tempfile.TemporaryDirectory() as directory:
        downloaded_run_logs = []
        for run_log in run_logs:
            match = GITHUB_ACTION_RUN_URL_REGEX.search(run_log)
            if not match:
                downloaded_run_logs.append(run_log)
                continue

            repository = match.group(1)
            run_id = match.group(2)
            run_path = os.path.join(directory, run_id)
            os.makedirs(run_path)

            print(f"Downloading unexpected stable results from run {run_id} of {repository}")
            if (
                subprocess.check_call(
                    [
                        "gh",
                        "run",
                        "download",
                        run_id,
                        "-R",
                        repository,
                        "--dir",
                        run_path,
                        "--pattern",
                        "*stable-unexpected-results-linux*",
                    ]
                )
                != 0
            ):
                print(f"Could not download artifact from run id {run_id}.")
                print("Is `gh` installed and authenticated?")
                return False
            downloaded_run_logs.append(
                os.path.join(run_path, "stable-unexpected-results-linux", "stable-unexpected-results.log")
            )

        kwargs["run_log"] = downloaded_run_logs
        logger = setup_logging(kwargs, {"mach": sys.stdout})
        return WPTUpdate(logger, **kwargs).run() != exit_unclean


def create_parser() -> ArgumentParser:
    return wptcommandline.create_parser_update()