# -*- coding: utf-8 -*-
# /***************************************************************************
# Irmt
#                                 A QGIS plugin
# OpenQuake Integrated Risk Modelling Toolkit
#                              -------------------
#        begin                : 2013-10-24
#        copyright            : (C) 2014 by GEM Foundation
#        email                : devops@openquake.org
# ***************************************************************************/
#
# OpenQuake is free software: you can redistribute it and/or modify it
# under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# OpenQuake 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 Affero General Public License
# along with OpenQuake.  If not, see <http://www.gnu.org/licenses/>.

import numpy
import collections
from qgis.core import (
    QgsFeature, QgsGeometry, QgsPointXY, edit, QgsTask, QgsApplication)
from svir.dialogs.load_output_as_layer_dialog import LoadOutputAsLayerDialog
from svir.utilities.utils import WaitCursorManager, log_msg, get_loss_types
from svir.tasks.extract_npz_task import ExtractNpzTask


class LoadAvgLossesRlzsAsLayerDialog(LoadOutputAsLayerDialog):
    """
    Dialog to load losses by asset or average asset losses from an
    oq-engine output, as layer
    """

    def __init__(self, drive_engine_dlg, iface, viewer_dock, session, hostname,
                 calc_id, output_type=None,
                 path=None, mode=None, zonal_layer_path=None,
                 engine_version=None, calculation_mode=None):
        assert output_type in ('avg_losses-rlzs', 'avg_losses-stats')
        super().__init__(
            drive_engine_dlg, iface, viewer_dock, session, hostname,
            calc_id, output_type=output_type, path=path, mode=mode,
            zonal_layer_path=zonal_layer_path, engine_version=engine_version,
            calculation_mode=calculation_mode)

        if self.output_type == 'avg_losses-rlzs':
            self.setWindowTitle(
                'Load losses by asset, aggregated by location, as layer')
        elif self.output_type == 'avg_losses-stats':
            self.setWindowTitle(
                'Load average asset losses (statistics),'
                ' aggregated by location, as layer')
        else:
            raise NotImplementedError(output_type)
        self.create_load_selected_only_ckb()
        self.create_num_sites_indicator()
        self.create_rlz_or_stat_selector()
        self.create_taxonomy_selector()
        self.create_loss_type_selector()
        self.create_zonal_layer_selector()

        # NOTE: it's correct to use 'avg_losses-rlzs' instead of output_type,
        #       both in case of avg_losses-rlzs and in case of avg_losses-stats
        log_msg('Extracting output data.'
                ' Watch progress in QGIS task bar',
                level='I', message_bar=self.iface.messageBar())
        self.extract_npz_task = ExtractNpzTask(
            'Extract losses by asset', QgsTask.CanCancel, self.session,
            self.hostname, self.calc_id, 'losses_by_asset', self.finalize_init,
            self.on_extract_error)
        QgsApplication.taskManager().addTask(self.extract_npz_task)

    def finalize_init(self, extracted_npz):
        self.npz_file = extracted_npz

        # NOTE: still running this synchronously, because it's small stuff
        with WaitCursorManager('Loading loss types...',
                               self.iface.messageBar()):
            self.loss_types = get_loss_types(
                self.session, self.hostname, self.calc_id,
                self.iface.messageBar())

        self.populate_out_dep_widgets()

        if self.zonal_layer_path:
            zonal_layer = self.load_zonal_layer(self.zonal_layer_path)
            self.populate_zonal_layer_cbx(zonal_layer)
        else:
            self.pre_populate_zonal_layer_cbx()
        self.adjustSize()
        self.set_ok_button()
        self.show()
        self.init_done.emit(self)

    def set_ok_button(self):
        self.ok_button.setEnabled(True)

    def on_rlz_or_stat_changed(self):
        self.dataset = self.npz_file[self.rlz_or_stat_cbx.currentText()]
        self.taxonomies = numpy.unique(self.dataset['taxonomy']).tolist()
        self.taxonomies = [taxonomy.decode('utf8')
                           for taxonomy in self.taxonomies]
        self.populate_taxonomy_cbx(self.taxonomies)
        self.set_ok_button()

    def populate_out_dep_widgets(self):
        self.populate_rlz_or_stat_cbx()
        self.populate_loss_type_cbx(self.loss_types)
        self.show_num_sites()

    def populate_taxonomy_cbx(self, taxonomies):
        taxonomies.insert(0, 'All')
        self.taxonomy_cbx.clear()
        self.taxonomy_cbx.addItems(taxonomies)
        self.taxonomy_cbx.setEnabled(True)

    def build_layer_name(self, rlz_or_stat=None, **kwargs):
        taxonomy = kwargs['taxonomy']
        loss_type = kwargs['loss_type']
        if self.output_type == 'avg_losses-rlzs':
            layer_name = "avg_losses-rlzs_%s_%s_%s" % (
                rlz_or_stat, taxonomy, loss_type)
        elif self.output_type == 'avg_losses-stats':
            layer_name = "avg_losses-stats_%s_%s_%s" % (
                rlz_or_stat, taxonomy, loss_type)
        else:
            raise NotImplementedError(self.output_type)
        return layer_name

    def get_field_types(self, **kwargs):
        loss_type = kwargs['loss_type']
        field_types = {'lon': 'F', 'lat': 'F', loss_type: 'F'}
        self.default_field_name = loss_type
        return field_types

    def read_npz_into_layer(self, field_types, **kwargs):
        rlz_or_stat = kwargs['rlz_or_stat']
        loss_type = kwargs['loss_type']
        taxonomy = kwargs['taxonomy']
        with edit(self.layer):
            feats = []
            grouped_by_site = self.group_by_site(
                self.npz_file, rlz_or_stat, loss_type, taxonomy)
            for row in grouped_by_site:
                # add a feature
                feat = QgsFeature(self.layer.fields())
                field_idx = 0
                for field_name, field_type in field_types.items():
                    if field_name in ['lon', 'lat']:
                        field_idx += 1
                        continue
                    value = row[field_idx].item()
                    if isinstance(value, bytes):
                        value = value.decode('utf8')
                    feat.setAttribute(field_name, value)
                    field_idx += 1
                feat.setGeometry(QgsGeometry.fromPointXY(
                    QgsPointXY(row['lon'], row['lat'])))
                feats.append(feat)
            added_ok = self.layer.addFeatures(feats)
            if not added_ok:
                msg = 'There was a problem adding features to the layer.'
                log_msg(msg, level='C', message_bar=self.iface.messageBar())
        return self.layer

    def load_from_npz(self):
        for rlz_or_stat in self.rlzs_or_stats:
            if (self.load_selected_only_ckb.isChecked()
                    and rlz_or_stat != self.rlz_or_stat_cbx.currentText()):
                continue
            for taxonomy in self.taxonomies:
                if (self.load_selected_only_ckb.isChecked()
                        and taxonomy != self.taxonomy_cbx.currentText()):
                    continue
                for loss_type in self.loss_types:
                    if (self.load_selected_only_ckb.isChecked()
                            and loss_type != self.loss_type_cbx.currentText()):
                        continue
                    with WaitCursorManager(
                            'Creating layer for "%s", '
                            ' taxonomy "%s" and loss type "%s"...' % (
                            rlz_or_stat, taxonomy, loss_type),
                            self.iface.messageBar()):
                        self.layer = self.build_layer(
                            rlz_or_stat, taxonomy=taxonomy,
                            loss_type=loss_type)
                        self.style_maps(self.layer,
                                        self.default_field_name,
                                        self.iface, self.output_type)

    def group_by_site(self, npz, rlz_or_stat, loss_type, taxonomy='All'):
        # example:
        # npz = numpy.load(npzfname, allow_pickle=False)
        # print(group_by_site(npz, 'rlz-000', 'structural_ins', '"tax1"'))
        F32 = numpy.float32
        loss_by_site = collections.defaultdict(float)  # lon, lat -> loss
        for rec in npz[rlz_or_stat]:
            if taxonomy == 'All' or taxonomy.encode('utf8') == rec['taxonomy']:
                loss_by_site[rec['lon'], rec['lat']] += rec[loss_type]
        data = numpy.zeros(len(loss_by_site),
                           [('lon', F32), ('lat', F32), (loss_type, F32)])
        for i, (lon, lat) in enumerate(sorted(loss_by_site)):
            data[i] = (lon, lat, loss_by_site[lon, lat])
        return data
