#!/usr/bin/env python3
"""
@file CodeQlVersionUpdate.py

Update CodeQL CLI dependencies and the CodeQL query pack version.

This maintainer-only helper updates the pinned CodeQL CLI release and the
corresponding CodeQL C/C++ query pack version used by the EDK II BaseTools
CodeQL plugin. The CodeQL plugin does not invoke this script automatically.

Audience
--------
EDK II BaseTools CodeQL plugin maintainers. Developers who build with the
CodeQL plugin enabled, or who review CodeQL analysis results, do not need to
run this script.

Usage
-----
Run this script manually from a local checkout:

    # Update to the latest published CodeQL CLI release.
    python3 BaseTools/Plugin/CodeQL/CodeQlVersionUpdate.py

    # Update to a specific CodeQL CLI version.
    python3 BaseTools/Plugin/CodeQL/CodeQlVersionUpdate.py --codeql-version 2.25.3

Then review and commit the resulting file changes.

Updated files
-------------
  - BaseTools/Plugin/CodeQL/codeqlcli_ext_dep.yaml
  - BaseTools/Plugin/CodeQL/codeqlcli_linux_ext_dep.yaml
  - BaseTools/Plugin/CodeQL/codeqlcli_windows_ext_dep.yaml
  - BaseTools/Plugin/CodeQL/CodeQlQueries.qls

Data sources
------------
- SHA256 digests are read from GitHub release metadata.
- The codeql/cpp-queries version is read from qlpack.yml in the corresponding
  CodeQL CLI branch.

Release metadata note
---------------------
This script depends on GitHub release-asset digests being present in the
release metadata. GitHub started exposing those digests on 2025-06-03:
https://github.blog/changelog/2025-06-03-releases-now-expose-digests-for-release-assets/
Releases published before that change may not have `digest` values in the API.

Copyright (c) 2026, Purdue University. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
"""

from __future__ import annotations

import argparse
import json
import re
import sys
import urllib.error
import urllib.request
from pathlib import Path
from typing import Dict


SCRIPT_DIR = Path(__file__).resolve().parent

EXT_DEP_FILES = {
    "codeql.zip": SCRIPT_DIR / "codeqlcli_ext_dep.yaml",
    "codeql-linux64.zip": SCRIPT_DIR / "codeqlcli_linux_ext_dep.yaml",
    "codeql-win64.zip": SCRIPT_DIR / "codeqlcli_windows_ext_dep.yaml",
}
QUERY_FILE = SCRIPT_DIR / "CodeQlQueries.qls"

HTTP_TIMEOUT_SECONDS = 30

def _http_get(url: str) -> bytes:
    req = urllib.request.Request(url, headers={"User-Agent": "edk2-codeql-updater"})
    with urllib.request.urlopen(req, timeout=HTTP_TIMEOUT_SECONDS) as resp:
        return resp.read()


def _http_get_json(url: str) -> dict:
    return json.loads(_http_get(url).decode("utf-8"))


def _http_get_text(url: str) -> str:
    return _http_get(url).decode("utf-8")


def _extract_sha256_from_text(text: str) -> str:
    # Expected content is either "<sha256>" or "<sha256> <filename>".
    token = text.strip().split()[0]
    if not re.fullmatch(r"[0-9a-fA-F]{64}", token):
        raise ValueError(f"Invalid sha256 text content: {text.strip()!r}")
    return token.lower()


def fetch_latest_codeql_version() -> str:
    latest_release_url = (
        "https://api.github.com/repos/github/codeql-cli-binaries/releases/latest"
    )
    latest_release = _http_get_json(latest_release_url)
    tag_name = latest_release.get("tag_name") or ""
    if not isinstance(tag_name, str) or not tag_name:
        raise ValueError("Unable to determine latest CodeQL version from GitHub")
    return tag_name.lstrip("v")


def fetch_release_sha256_map(codeql_version: str) -> Dict[str, str]:
    release_url = (
        "https://api.github.com/repos/github/codeql-cli-binaries/releases/tags/"
        f"v{codeql_version}"
    )
    release = _http_get_json(release_url)
    assets = {asset["name"]: asset for asset in release.get("assets", [])}

    sha_map: Dict[str, str] = {}
    for asset_name in EXT_DEP_FILES:
        asset = assets.get(asset_name)
        if asset is None:
            raise KeyError(
                f"Release v{codeql_version} does not include required asset: {asset_name}"
            )

        digest = asset.get("digest") or ""
        if digest.startswith("sha256:"):
            sha_map[asset_name] = digest.split(":", 1)[1].lower()
            continue

        sha_asset = assets.get(f"{asset_name}.checksum.txt")
        if sha_asset:
            sha_text = _http_get_text(sha_asset["browser_download_url"])
            sha_map[asset_name] = _extract_sha256_from_text(sha_text)
            continue

        raise KeyError(
            f"Unable to find SHA256 for {asset_name} in release v{codeql_version}"
        )

    return sha_map


def fetch_cpp_queries_version(codeql_version: str) -> str:
    qlpack_url = (
        "https://raw.githubusercontent.com/github/codeql/"
        f"codeql-cli/v{codeql_version}/cpp/ql/src/qlpack.yml"
    )
    qlpack_text = _http_get_text(qlpack_url)

    # qlpack.yml for cpp queries uses:
    #   name: codeql/cpp-queries
    #   version: <pack version>
    if "name: codeql/cpp-queries" not in qlpack_text:
        raise ValueError(
            f"Unable to validate cpp queries pack in qlpack.yml for v{codeql_version}"
        )

    match = re.search(r"(?m)^\s*version:\s*([0-9A-Za-z.\-_]+)\s*$", qlpack_text)
    if not match:
        raise ValueError(
            f"Unable to parse codeql/cpp-queries version for v{codeql_version}"
        )
    return match.group(1)


def read_text(path: Path) -> str:
    with path.open("r", encoding="utf-8", newline="") as f:
        return f.read()


def detect_newline_style(text: str) -> str:
    if "\r\n" in text:
        return "\r\n"
    return "\n"


def normalize_newlines(text: str, newline: str) -> str:
    normalized = text.replace("\r\n", "\n")
    if newline == "\r\n":
        return normalized.replace("\n", "\r\n")
    return normalized


def write_text(path: Path, text: str) -> None:
    path.write_text(text, encoding="utf-8", newline="")


def replace_or_fail(pattern: str, replacement: str, text: str, path: Path) -> str:
    new_text, count = re.subn(pattern, replacement, text, count=1, flags=re.MULTILINE)
    if count != 1:
        raise ValueError(f"Expected one match for pattern {pattern!r} in {path}")
    return new_text


def update_ext_dep_file(path: Path, asset_name: str, codeql_version: str, sha256: str) -> bool:
    original = read_text(path)
    newline_style = detect_newline_style(original)
    text = original
    source_url = (
        "https://github.com/github/codeql-cli-binaries/releases/download/"
        f"v{codeql_version}/{asset_name}"
    )

    text = replace_or_fail(
        r'("source"\s*:\s*")[^"]+(")',
        rf'\g<1>{source_url}\g<2>',
        text,
        path,
    )
    text = replace_or_fail(
        r'("version"\s*:\s*")[^"]+(")',
        rf'\g<1>{codeql_version}\g<2>',
        text,
        path,
    )
    text = replace_or_fail(
        r'("sha256"\s*:\s*")[0-9a-fA-F]{64}(")',
        rf'\g<1>{sha256}\g<2>',
        text,
        path,
    )

    if text != original:
        write_text(path, normalize_newlines(text, newline_style))
        return True
    return False


def update_queries_file(path: Path, cpp_queries_version: str) -> bool:
    original = read_text(path)
    newline_style = detect_newline_style(original)
    text = replace_or_fail(
        r"(from:\s*codeql/cpp-queries@)[0-9A-Za-z.\-_]+",
        rf"\g<1>{cpp_queries_version}",
        original,
        path,
    )
    if text != original:
        write_text(path, normalize_newlines(text, newline_style))
        return True
    return False


def parse_args() -> argparse.Namespace:
    parser = argparse.ArgumentParser(
        description="Update CodeQL CLI versions and cpp query pack version."
    )
    parser.add_argument(
        "--codeql-version",
        help=(
            "CodeQL CLI version (for example: 2.24.1). If omitted, the latest "
            "published release is used."
        ),
    )
    parser.add_argument(
        "--dry-run",
        action="store_true",
        help="Calculate and print updates without writing files.",
    )
    return parser.parse_args()


def main() -> int:
    args = parse_args()

    try:
        codeql_version = (
            args.codeql_version.lstrip("v")
            if args.codeql_version
            else fetch_latest_codeql_version()
        )

        sha_map: Dict[str, str] = fetch_release_sha256_map(codeql_version)

        for asset_name, sha in sha_map.items():
            if not re.fullmatch(r"[0-9a-f]{64}", sha):
                raise ValueError(f"Invalid SHA256 value for {asset_name}: {sha}")

        cpp_queries_version = fetch_cpp_queries_version(codeql_version)

        print(f"CodeQL version: v{codeql_version}")
        print(f"codeql/cpp-queries version: {cpp_queries_version}")
        for asset_name in sorted(sha_map):
            print(f"{asset_name} sha256: {sha_map[asset_name]}")

        if args.dry_run:
            print("Dry run: no files were modified.")
            return 0

        changed_files = []
        for asset_name, path in EXT_DEP_FILES.items():
            if update_ext_dep_file(path, asset_name, codeql_version, sha_map[asset_name]):
                changed_files.append(path)
        if update_queries_file(QUERY_FILE, cpp_queries_version):
            changed_files.append(QUERY_FILE)

        if changed_files:
            print("Updated files:")
            for path in changed_files:
                print(f"  - {path}")
        else:
            print("No file changes were necessary.")
        return 0

    except urllib.error.HTTPError as err:
        print(f"HTTP error while fetching release data: {err}", file=sys.stderr)
    except (urllib.error.URLError, TimeoutError) as err:
        print(f"Network error while fetching release data: {err}", file=sys.stderr)
    except (KeyError, ValueError) as err:
        print(f"Error: {err}", file=sys.stderr)
    return 1


if __name__ == "__main__":
    raise SystemExit(main())