# Source code for svir.dialogs.load_hmaps_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/>.

    from qgis.core import (
        QgsFeature, QgsGeometry, QgsPointXY, edit, QgsTask, QgsApplication)
    from qgis.PyQt.QtCore import Qt
    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
    from svir.tasks.extract_npz_task import ExtractNpzTask

    class LoadHazardMapsAsLayerDialog(LoadOutputAsLayerDialog):
        """
        Dialog to load hazard maps from an oq-engine output, as layer
        """
        def __init__(self, iface, viewer_dock, session, hostname, calc_id,
                     output_type='hmaps', path=None, mode=None,
                     engine_version=None):
            assert output_type == 'hmaps'
            LoadOutputAsLayerDialog.__init__(
                self, iface, viewer_dock, session, hostname, calc_id,
                output_type=output_type, path=path, mode=mode,
                engine_version=engine_version)

            self.setWindowTitle(
                'Load hazard maps as layer')
            self.create_num_sites_indicator()
            self.create_load_multicol_ckb()
            self.create_rlz_or_stat_selector(all_ckb=True)
            self.create_imt_selector(all_ckb=True)
            self.create_poe_selector(all_ckb=True)
            self.create_show_return_period_ckb()

            self.load_multicol_ckb.stateChanged[int].connect(
                self.on_load_multicol_ckb_stateChanged)

            self.extract_npz_task = ExtractNpzTask(
                'Extract hazard maps', QgsTask.CanCancel, self.session,
                self.hostname, self.calc_id, self.output_type, self.finalize_init,
                self.on_extract_error)
            QgsApplication.taskManager().addTask(self.extract_npz_task)

        def on_load_multicol_ckb_stateChanged(self, state):
            if state == Qt.Checked:
                self.show_return_period_chk.setChecked(False)
                self.show_return_period_chk.setEnabled(False)
                self.load_all_poes_chk.setChecked(True)
                self.load_all_poes_chk.setEnabled(False)
                self.poe_cbx.setEnabled(True)
                self.poe_lbl.setText(
                    'Probability of Exceedance (used for styling)')
                self.load_all_imts_chk.setChecked(True)
                self.load_all_imts_chk.setEnabled(False)
                self.imt_cbx.setEnabled(True)
                self.imt_lbl.setText(
                    'Intensity Measure Type (used for styling)')
            else:
                self.show_return_period_chk.setEnabled(True)
                self.load_all_poes_chk.setChecked(False)
                self.load_all_poes_chk.setEnabled(True)
                self.poe_cbx.setEnabled(True)
                self.poe_lbl.setText(
                    'Probability of Exceedance')
                self.load_all_imts_chk.setChecked(False)
                self.load_all_imts_chk.setEnabled(True)
                self.imt_cbx.setEnabled(True)
                self.imt_lbl.setText(
                    'Intensity Measure Type')

        def set_ok_button(self):
            self.ok_button.setEnabled(self.poe_cbx.currentIndex() != -1)

        def populate_rlz_or_stat_cbx(self):
            # excluding lon, lat (in old calculations, we might also find 'vs30',
            # that has to be discarded too)
            self.rlzs_or_stats = [
                rlz_or_stat
                for rlz_or_stat in self.npz_file['all'].dtype.names[2:]
                if rlz_or_stat != 'vs30']
            self.rlz_or_stat_cbx.clear()
            self.rlz_or_stat_cbx.setEnabled(True)
            self.rlz_or_stat_cbx.addItems(self.rlzs_or_stats)

        def on_rlz_or_stat_changed(self):
            self.dataset = self.npz_file['all'][self.rlz_or_stat_cbx.currentText()]
            self.imts = {imt: self.dataset[imt].dtype.names
                         for imt in self.dataset.dtype.names}
            self.imt_cbx.clear()
            self.imt_cbx.setEnabled(True)
            self.imt_cbx.addItems(list(self.imts))
            self.set_ok_button()

        def show_num_sites(self):
            # NOTE: we are assuming all realizations have the same number of sites,
            #       which currently is always true.
            #       If different realizations have a different number of sites, we
            #       need to move this block of code inside on_rlz_or_stat_changed()
            rlz_or_stat_data = self.npz_file['all'][
                self.rlz_or_stat_cbx.currentText()]
            self.num_sites_lbl.setText(
                self.num_sites_msg % rlz_or_stat_data.shape)

        def on_imt_changed(self):
            self.imt = self.imt_cbx.currentText()
            self.poe_cbx.clear()
            self.poe_cbx.setEnabled(True)
            if self.imt:
                self.poe_cbx.addItems(self.imts[self.imt])
            self.set_ok_button()

        def build_layer_name(self, rlz_or_stat=None, **kwargs):
            if self.load_multicol_ckb.isChecked():
                imt = self.imt_cbx.currentText()
                poe = self.poe_cbx.currentText()
            else:
                imt = kwargs['imt']
                poe = kwargs['poe']
            self.default_field_name = '%s-%s' % (imt, poe)
            investigation_time = self.get_investigation_time()
            if self.load_multicol_ckb.isChecked():
                layer_name = "hazard_map_%s_%sy" % (
                    rlz_or_stat, investigation_time)
            elif self.show_return_period_chk.isChecked():
                return_period = int(float(investigation_time) / float(poe))
                layer_name = "hmap_%s_%s_%syr" % (
                    rlz_or_stat, imt, return_period)
            else:
                layer_name = "hmap_%s_%s_poe-%s_%sy" % (
                    rlz_or_stat, imt, poe, investigation_time)
            return layer_name

        def get_field_names(self, **kwargs):
            if self.load_multicol_ckb.isChecked():
                field_names = []
                for imt in self.imts:
                    for poe in self.imts[imt]:
                        field_name = "%s-%s" % (imt, poe)
                        field_names.append(field_name)
            else:
                imt = kwargs['imt']
                poe = kwargs['poe']
                field_names = ['%s-%s' % (imt, poe)]
            return field_names

        def add_field_to_layer(self, field_name):
            try:
                # NOTE: add_numeric_attribute uses the native qgis editing manager
                added_field_name = add_numeric_attribute(field_name, self.layer)
            except TypeError as exc:
                log_msg(str(exc), level='C', message_bar=self.iface.messageBar(),
                        exception=exc)
                return
            return added_field_name

        def read_npz_into_layer(self, field_names, **kwargs):
            with edit(self.layer):
                lons = self.npz_file['all']['lon']
                lats = self.npz_file['all']['lat']
                feats = []
                for row_idx, row in enumerate(self.dataset):
                    # add a feature
                    feat = QgsFeature(self.layer.fields())
                    for field_name in field_names:
                        # NB: example field_name == 'PGA-0.01'
                        # NOTE: without casting to float, it produces a
                        #       null because it does not recognize the
                        #       numpy type
                        imt, poe = field_name.split('-')
                        value = float(row[imt][poe])
                        feat.setAttribute(field_name, value)
                    feat.setGeometry(QgsGeometry.fromPointXY(
                        QgsPointXY(lons[row_idx], lats[row_idx])))
                    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 (not self.load_all_rlzs_or_stats_chk.isChecked()
                        and rlz_or_stat != self.rlz_or_stat_cbx.currentText()):
                    continue
                if self.load_multicol_ckb.isChecked():
                    with WaitCursorManager(
                            'Creating layer for "%s"...' % rlz_or_stat,
                            self.iface.messageBar()):
                        self.build_layer(rlz_or_stat)
                        self.style_maps(self.layer, self.default_field_name,
                                        self.iface, self.output_type)
                else:
                    for imt in self.imts:
                        if (not self.load_all_imts_chk.isChecked()
                                and imt != self.imt_cbx.currentText()):
                            continue
                        for poe in self.imts[imt]:
                            if (not self.load_all_poes_chk.isChecked()
                                    and poe != self.poe_cbx.currentText()):
                                continue
                            with WaitCursorManager(
                                    'Creating layer for "%s, %s, %s"...' % (
                                        rlz_or_stat, imt, poe),
                                    self.iface.messageBar()):
                                self.build_layer(rlz_or_stat, imt=imt, poe=poe)
                                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()