"""Manage Markov models and administrative commands."""

import logging

from django.contrib import admin
from django.contrib.auth.decorators import permission_required
from django.shortcuts import render

from markov.forms import LogUploadForm, TeachLineForm
import markov.lib as markovlib
from markov.models import MarkovContext, MarkovTarget, MarkovState


log = logging.getLogger('markov.admin')


admin.site.register(MarkovContext)
admin.site.register(MarkovTarget)
admin.site.register(MarkovState)


@permission_required('import_log_file', raise_exception=True)
def import_file(request):
    """Accept a file upload and turn it into markov stuff.

    Current file formats supported:
    * weechat
    """

    if request.method == 'POST':
        form = LogUploadForm(request.POST, request.FILES)
        if form.is_valid():
            log_file = request.FILES['log_file']
            context = form.cleaned_data['context']
            ignores = form.cleaned_data['ignore_nicks'].split(',')
            strips = form.cleaned_data['strip_prefixes'].split(' ')

            whos = []
            for line in log_file:
                log.debug(line)
                (timestamp, who, what) = line.decode('utf-8').split('\t', 2)

                if who in ('-->', '<--', '--', ' *'):
                    continue

                if who in ignores:
                    continue

                whos.append(who)

                # this is a line we probably care about now
                what = [x for x in what.rstrip().split(' ') if x not in strips]
                markovlib.learn_line(' '.join(what), context)
                log.debug("learned")

            log.debug(set(whos))
            form = LogUploadForm()
    else:
        form = LogUploadForm()

    return render(request, 'import_file.html', {'form': form})


@permission_required('teach_line', raise_exception=True)
def teach_line(request):
    """Teach one line directly."""

    if request.method == 'POST':
        form = TeachLineForm(request.POST)
        if form.is_valid():
            line = form.cleaned_data['line']
            context = form.cleaned_data['context']
            strips = form.cleaned_data['strip_prefixes'].split(' ')
            what = [x for x in line.rstrip().split(' ') if x not in strips]
            markovlib.learn_line(' '.join(what), context)
            form = TeachLineForm()
    else:
        form = TeachLineForm()

    return render(request, 'teach_line.html', {'form': form})


admin.site.register_view('markov/importfile/', "Markov - Import log file", view=import_file,
                         urlname='markov_import_file')
admin.site.register_view('markov/teach/', "Markov - Teach line", view=teach_line, urlname='markov_teach_line')