#! /usr/bin/env python3
#
# Copyright (c) 2016 ARM Limited
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# met: redistributions of source code must retain the above copyright
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import os
import sys

import style.verifiers
from style import repo
from style.file_types import lang_type
from style.region import all_regions
from style.style import StdioUI

verifier_names = {c.__name__: c for c in style.verifiers.all_verifiers}


def verify(
    filename,
    regions=all_regions,
    verbose=False,
    verifiers=None,
    auto_fix=False,
):
    ui = StdioUI()
    opts = {"fix_all": auto_fix}
    base = os.path.join(os.path.dirname(__file__), "..")
    if verifiers is None:
        verifiers = style.verifiers.all_verifiers

    if verbose:
        print(f"Verifying {filename}[{regions}]...")
    for verifier in [v(ui, opts, base=base) for v in verifiers]:
        if verbose:
            print(
                f"Applying {verifier.test_name} ({verifier.__class__.__name__})"
            )
        if verifier.apply(filename, regions=regions):
            return False
    return True


def detect_repo():
    repo_classes = repo.detect_repo()
    if not repo_classes:
        print(
            "Error: Failed to detect repository type, no "
            "known repository type found.",
            file=sys.stderr,
        )
        sys.exit(1)
    elif len(repo_classes) > 1:
        print("Error: Detected multiple repository types.", file=sys.stderr)
        sys.exit(1)
    else:
        return repo_classes[0]()


repo_types = {"auto": detect_repo, "none": lambda: None, "git": repo.GitRepo}

if __name__ == "__main__":
    import argparse

    parser = argparse.ArgumentParser(
        description="Check a file for gem5 style violations",
        epilog="""If no files are specified, the style checker tries to
        determine the list of modified and added files from the version
        control system and checks those.""",
    )

    parser.add_argument(
        "--verbose", "-v", action="count", help="Produce verbose output"
    )

    parser.add_argument(
        "--fix",
        "-f",
        action="store_true",
        help="Automatically fix style violations.",
    )

    parser.add_argument(
        "--modifications",
        "-m",
        action="store_true",
        help="""Apply the style checker to modified regions
                        instead of whole files""",
    )

    parser.add_argument(
        "--repo-type",
        choices=repo_types,
        default="auto",
        help="Repository type to use to detect changes",
    )

    parser.add_argument(
        "--checker",
        "-c",
        choices=verifier_names,
        default=[],
        action="append",
        help="""Style checkers to run. Can be specified
                        multiple times.""",
    )

    parser.add_argument(
        "files",
        metavar="FILE",
        nargs="*",
        type=str,
        help="Source file(s) to inspect",
    )

    args = parser.parse_args()

    repo = repo_types[args.repo_type]()

    verifiers = (
        [verifier_names[name] for name in args.checker]
        if args.checker
        else None
    )

    files = args.files
    if not files and repo:
        added, modified = repo.staged_files()
        files = [repo.file_path(f) for f in added + modified]

    for filename in files:
        if args.modifications and repo and repo.in_repo(filename):
            regions = repo.modified_regions(filename)
        else:
            regions = all_regions

        if not verify(
            filename,
            regions=regions,
            verbose=args.verbose,
            verifiers=verifiers,
            auto_fix=args.fix,
        ):
            sys.exit(1)