#!/usr/bin/env python3
# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:

# Copyright 2014-2015 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
#
# This file is part of qutebrowser.
#
# qutebrowser is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# qutebrowser is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.

"""Various small code checkers."""

import os
import re
import sys
import os.path
import argparse
import subprocess
import tokenize
import traceback
import collections

sys.path.insert(0, os.path.join(os.path.dirname(__file__), os.pardir))

from scripts import utils


def _py_files(target):
    """Iterate over all python files and yield filenames."""
    for (dirpath, _dirnames, filenames) in os.walk(target):
        for name in (e for e in filenames if e.endswith('.py')):
            yield os.path.join(dirpath, name)


def check_git():
    """Check for uncommitted git files.."""
    if not os.path.isdir(".git"):
        print("No .git dir, ignoring")
        print()
        return False
    untracked = []
    gitst = subprocess.check_output(['git', 'status', '--porcelain'])
    gitst = gitst.decode('UTF-8').strip()
    for line in gitst.splitlines():
        s, name = line.split(maxsplit=1)
        if s == '??' and name != '.venv/':
            untracked.append(name)
    status = True
    if untracked:
        status = False
        utils.print_col("Untracked files:", 'red')
        print('\n'.join(untracked))
    print()
    return status


def check_spelling(target):
    """Check commonly misspelled words."""
    # Words which I often misspell
    words = {'behaviour', 'quitted', 'likelyhood', 'sucessfully',
             'occur[^r .]', 'seperator', 'explicitely', 'resetted',
             'auxillary', 'accidentaly', 'ambigious', 'loosly',
             'initialis', 'convienence', 'similiar', 'uncommited',
             'reproducable'}

    # Words which look better when splitted, but might need some fine tuning.
    words |= {'keystrings', 'webelements', 'mouseevent', 'keysequence',
              'normalmode', 'eventloops', 'sizehint', 'statemachine',
              'metaobject', 'logrecord', 'filetype'}

    seen = collections.defaultdict(list)
    try:
        ok = True
        for fn in _py_files(target):
            with tokenize.open(fn) as f:
                if fn == os.path.join('scripts', 'misc_checks.py'):
                    continue
                for line in f:
                    for w in words:
                        if re.search(w, line, re.I) and fn not in seen[w]:
                            print("Found '{}' in {}!".format(w, fn))
                            seen[w].append(fn)
                            ok = False
        print()
        return ok
    except Exception:
        traceback.print_exc()
        return None


def check_vcs_conflict(target):
    """Check VCS conflict markers."""
    try:
        ok = True
        for fn in _py_files(target):
            with tokenize.open(fn) as f:
                for line in f:
                    if any(line.startswith(c * 7) for c in '<>=|'):
                        print("Found conflict marker in {}".format(fn))
                        ok = False
        print()
        return ok
    except Exception:
        traceback.print_exc()
        return None


def main():
    """Main entry point."""
    parser = argparse.ArgumentParser()
    parser.add_argument('checker', choices=('git', 'vcs', 'spelling'),
                        help="Which checker to run.")
    parser.add_argument('target', help="What to check", nargs='*')
    args = parser.parse_args()
    if args.checker == 'git':
        ok = check_git()
        return 0 if ok else 1
    elif args.checker == 'vcs':
        is_ok = True
        for target in args.target:
            ok = check_vcs_conflict(target)
            if not ok:
                is_ok = False
        return 0 if is_ok else 1
    elif args.checker == 'spelling':
        is_ok = True
        for target in args.target:
            ok = check_spelling(target)
            if not ok:
                is_ok = False
        return 0 if is_ok else 1


if __name__ == '__main__':
    sys.exit(main())