import json

import flask
from werkzeug.datastructures import CombinedMultiDict

from sqlalchemy.orm import joinedload

from nyaa import backend, db, forms, models
from nyaa.utils import cached_function

bp = flask.Blueprint('torrents', __name__)


@bp.route('/view/<int:torrent_id>', endpoint='view', methods=['GET', 'POST'])
def view_torrent(torrent_id):
    if flask.request.method == 'POST':
        torrent = models.Torrent.by_id(torrent_id)
    else:
        torrent = models.Torrent.query \
                                .options(joinedload('filelist'),
                                         joinedload('comments')) \
                                .filter_by(id=torrent_id) \
                                .first()
    if not torrent:
        flask.abort(404)

    # Only allow admins see deleted torrents
    if torrent.deleted and not (flask.g.user and flask.g.user.is_moderator):
        flask.abort(404)

    comment_form = None
    if flask.g.user:
        comment_form = forms.CommentForm()

    if flask.request.method == 'POST':
        if not flask.g.user:
            flask.abort(403)

        if comment_form.validate():
            comment_text = (comment_form.comment.data or '').strip()

            comment = models.Comment(
                torrent_id=torrent_id,
                user_id=flask.g.user.id,
                text=comment_text)

            db.session.add(comment)
            db.session.flush()

            torrent_count = torrent.update_comment_count()
            db.session.commit()

            flask.flash('Comment successfully posted.', 'success')

            return flask.redirect(flask.url_for('torrents.view',
                                                torrent_id=torrent_id,
                                                _anchor='com-' + str(torrent_count)))

    # Only allow owners and admins to edit torrents
    can_edit = flask.g.user and (flask.g.user is torrent.user or flask.g.user.is_moderator)

    files = None
    if torrent.filelist:
        files = json.loads(torrent.filelist.filelist_blob.decode('utf-8'))

    report_form = forms.ReportForm()
    return flask.render_template('view.html', torrent=torrent,
                                 files=files,
                                 comment_form=comment_form,
                                 comments=torrent.comments,
                                 can_edit=can_edit,
                                 report_form=report_form)


@bp.route('/view/<int:torrent_id>/edit', endpoint='edit', methods=['GET', 'POST'])
def edit_torrent(torrent_id):
    torrent = models.Torrent.by_id(torrent_id)
    form = forms.EditForm(flask.request.form)
    form.category.choices = _create_upload_category_choices()

    editor = flask.g.user

    if not torrent:
        flask.abort(404)

    # Only allow admins edit deleted torrents
    if torrent.deleted and not (editor and editor.is_moderator):
        flask.abort(404)

    # Only allow torrent owners or admins edit torrents
    if not editor or not (editor is torrent.user or editor.is_moderator):
        flask.abort(403)

    if flask.request.method == 'POST' and form.validate():
        # Form has been sent, edit torrent with data.
        torrent.main_category_id, torrent.sub_category_id = \
            form.category.parsed_data.get_category_ids()
        torrent.display_name = (form.display_name.data or '').strip()
        torrent.information = (form.information.data or '').strip()
        torrent.description = (form.description.data or '').strip()

        torrent.hidden = form.is_hidden.data
        torrent.remake = form.is_remake.data
        torrent.complete = form.is_complete.data
        torrent.anonymous = form.is_anonymous.data

        if editor.is_trusted:
            torrent.trusted = form.is_trusted.data

        deleted_changed = torrent.deleted != form.is_deleted.data
        if editor.is_moderator:
            torrent.deleted = form.is_deleted.data

        url = flask.url_for('torrents.view', torrent_id=torrent.id)
        if deleted_changed and editor.is_moderator:
            log = "Torrent [#{0}]({1}) marked as {2}".format(
                torrent.id, url, "deleted" if torrent.deleted else "undeleted")
            adminlog = models.AdminLog(log=log, admin_id=editor.id)
            db.session.add(adminlog)

        db.session.commit()

        flask.flash(flask.Markup(
            'Torrent has been successfully edited! Changes might take a few minutes to show up.'),
            'info')

        return flask.redirect(url)
    else:
        if flask.request.method != 'POST':
            # Fill form data only if the POST didn't fail
            form.category.data = torrent.sub_category.id_as_string
            form.display_name.data = torrent.display_name
            form.information.data = torrent.information
            form.description.data = torrent.description

            form.is_hidden.data = torrent.hidden
            form.is_remake.data = torrent.remake
            form.is_complete.data = torrent.complete
            form.is_anonymous.data = torrent.anonymous

            form.is_trusted.data = torrent.trusted
            form.is_deleted.data = torrent.deleted

        return flask.render_template('edit.html',
                                     form=form,
                                     torrent=torrent)


@bp.route('/upload', methods=['GET', 'POST'])
def upload():
    upload_form = forms.UploadForm(CombinedMultiDict((flask.request.files, flask.request.form)))
    upload_form.category.choices = _create_upload_category_choices()

    if flask.request.method == 'POST' and upload_form.validate():
        torrent = backend.handle_torrent_upload(upload_form, flask.g.user)

        return flask.redirect(flask.url_for('torrents.view', torrent_id=torrent.id))
    else:
        # If we get here with a POST, it means the form data was invalid: return a non-okay status
        status_code = 400 if flask.request.method == 'POST' else 200
        return flask.render_template('upload.html', upload_form=upload_form), status_code


@cached_function
def _create_upload_category_choices():
    ''' Turns categories in the database into a list of (id, name)s '''
    choices = [('', '[Select a category]')]
    id_map = backend.get_category_id_map()

    for key in sorted(id_map.keys()):
        cat_names = id_map[key]
        is_main_cat = key.endswith('_0')

        # cat_name = is_main_cat and cat_names[0] or (' - ' + cat_names[1])
        cat_name = ' - '.join(cat_names)
        choices.append((key, cat_name, is_main_cat))
    return choices