#!/usr/bin/env python3
# pylint: disable=C0103,C0114,C0115,C0116,C0123,C0301,R0902,R0913,R0914,R0912,R0915,W0621
######################################################################

import argparse
import collections
import re

parser = argparse.ArgumentParser(
    allow_abbrev=False,
    formatter_class=argparse.RawDescriptionHelpFormatter,
    description="""Report ccache behavior of a Verilated model build.""",
    epilog=
    """Copyright 2002-2021 by Wilson Snyder. This program is free software; you
can redistribute it and/or modify it under the terms of either the GNU
Lesser General Public License Version 3 or the Perl Artistic License
Version 2.0.

SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0""")

parser.add_argument('-o',
                    type=argparse.FileType('w'),
                    metavar="OUTFILE",
                    required=True,
                    help='output file')
parser.add_argument('logfile',
                    type=argparse.FileType('r'),
                    help='ccache log file')

args = parser.parse_args()

results = {}

for line in args.logfile:
    line = line.strip()
    match = re.match(r'.*Object file: (.*)$', line)
    if match:
        obj = match.group(1)
    match = re.match(r'.*Result: (.*)$', line)
    if match:
        results[obj] = match.group(1)

args.o.write("#" * 80 + "\n")
args.o.write("ccache report (from verilator_ccache_report) :\n")

if not results:
    args.o.write("\nAll object files up to date\n")
else:
    args.o.write("\nCompiled object files:\n")
    width = max(len(_) for _ in results) + 1
    for k in sorted(results.keys()):
        args.o.write("{:{width}} : {}\n".format(k, results[k], width=width))

    args.o.write("\nSummary:\n")
    counts = collections.Counter(_ for _ in results.values())
    total = sum(counts.values())
    width = max(len(_) for _ in results.values()) + 1
    for k in sorted(counts.keys()):
        c = counts[k]
        args.o.write("{:{width}}| {} ({:.2%})\n".format(k,
                                                        c,
                                                        c / total,
                                                        width=width))

args.o.write("#" * 80 + "\n")