# Source code for svir.dialogs.load_losses_by_asset_as_layer_dialog

    # -*- 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.calculations.calculate_utils import add_numeric_attribute
    from svir.utilities.utils import WaitCursorManager, log_msg, get_loss_types
    from svir.tasks.extract_npz_task import ExtractNpzTask

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

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

            if self.output_type == 'losses_by_asset':
                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 'losses_by_asset' instead of output_type,
            #       both in case of losses_by_asset and in case of avg_losses-stats
            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()

        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 == 'losses_by_asset':
                layer_name = "losses_by_asset_%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_names(self, **kwargs):
            loss_type = kwargs['loss_type']
            field_names = ['lon', 'lat', loss_type]
            self.default_field_name = loss_type
            return field_names

        def add_field_to_layer(self, field_name):
            # NOTE: add_numeric_attribute uses the native qgis editing manager
            added_field_name = add_numeric_attribute(
                field_name, self.layer)
            return added_field_name

        def read_npz_into_layer(self, field_names, **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())
                    for field_name_idx, field_name in enumerate(field_names):
                        if field_name in ['lon', 'lat']:
                            continue
                        value = float(row[field_name_idx])
                        feat.setAttribute(field_names[field_name_idx], value)
                    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())

        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.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)
            if self.npz_file is not None:
                self.npz_file.close()

        def group_by_site(self, npz, rlz_or_stat, loss_type, taxonomy='All'):
            # example:
            # npz = numpy.load(npzfname, allow_pickle=True)
            # 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