# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:

# Copyright 2014-2021 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 <https://www.gnu.org/licenses/>.

"""Functions that return config-related completion models."""

from qutebrowser.config import configdata, configexc
from qutebrowser.completion.models import completionmodel, listcategory, util
from qutebrowser.commands import parser, cmdexc
from qutebrowser.keyinput import keyutils


def option(*, info):
    """A CompletionModel filled with settings and their descriptions."""
    return _option(info, "Options", lambda opt: not opt.no_autoconfig)


def customized_option(*, info):
    """A CompletionModel filled with set settings and their descriptions."""
    model = completionmodel.CompletionModel(column_widths=(20, 70, 10))
    options = ((values.opt.name, values.opt.description,
                info.config.get_str(values.opt.name))
               for values in info.config
               if values)
    model.add_category(listcategory.ListCategory("Customized options",
                                                 options))
    return model


def list_option(*, info):
    """A CompletionModel filled with settings whose values are lists."""
    predicate = lambda opt: (isinstance(info.config.get_obj(opt.name),
                                        list) and not opt.no_autoconfig)
    return _option(info, "List options", predicate)


def dict_option(*, info):
    """A CompletionModel filled with settings whose values are dicts."""
    predicate = lambda opt: (isinstance(info.config.get_obj(opt.name),
                                        dict) and not opt.no_autoconfig)
    return _option(info, "Dict options", predicate)


def _option(info, title, predicate):
    """A CompletionModel that is generated for several option sets.

    Args:
        info: The config info that can be passed through.
        title: The title of the options.
        predicate: The function for filtering out the options. Takes a single
                   argument.
    """
    model = completionmodel.CompletionModel(column_widths=(20, 70, 10))
    options = ((opt.name, opt.description, info.config.get_str(opt.name))
               for opt in configdata.DATA.values()
               if predicate(opt))
    model.add_category(listcategory.ListCategory(title, options))
    return model


def value(optname, *values, info):
    """A CompletionModel filled with setting values.

    Args:
        optname: The name of the config option this model shows.
        *values: The values already provided on the command line.
        info: A CompletionInfo instance.
    """
    model = completionmodel.CompletionModel(column_widths=(30, 70, 0))

    try:
        current = info.config.get_str(optname)
    except configexc.NoOptionError:
        return None

    opt = info.config.get_opt(optname)
    default = opt.typ.to_str(opt.default)
    cur_def = []
    if current not in values:
        cur_def.append((current, "Current value"))
    if default not in values:
        cur_def.append((default, "Default value"))
    if cur_def:
        cur_cat = listcategory.ListCategory("Current/Default", cur_def)
        model.add_category(cur_cat)

    vals = opt.typ.complete() or []
    vals = [x for x in vals if x[0] not in values]
    if vals:
        model.add_category(listcategory.ListCategory("Completions", vals))
    return model


def _bind_current_default(key, info):
    """Get current/default data for the given key."""
    data = []
    try:
        seq = keyutils.KeySequence.parse(key)
    except keyutils.KeyParseError as e:
        data.append(('', str(e), key))
        return data

    cmd_text = info.keyconf.get_command(seq, 'normal')
    if cmd_text:
        try:
            cmd = parser.CommandParser().parse(cmd_text).cmd
        except cmdexc.NoSuchCommandError:
            data.append((cmd_text, '(Current) Invalid command!', key))
        else:
            data.append((cmd_text, '(Current) {}'.format(cmd.desc), key))

    cmd_text = info.keyconf.get_command(seq, 'normal', default=True)
    if cmd_text:
        cmd = parser.CommandParser().parse(cmd_text).cmd
        data.append((cmd_text, '(Default) {}'.format(cmd.desc), key))

    return data


def bind(key, *, info):
    """A CompletionModel filled with all bindable commands and descriptions.

    Args:
        key: the key being bound.
        info: A CompletionInfo instance.
    """
    model = completionmodel.CompletionModel(column_widths=(20, 60, 20))
    data = _bind_current_default(key, info)

    if data:
        model.add_category(listcategory.ListCategory("Current/Default", data))

    cmdlist = util.get_cmd_completions(info, include_hidden=True,
                                       include_aliases=True)
    model.add_category(listcategory.ListCategory("Commands", cmdlist))
    return model
