# -*- coding: utf-8 -*-
"""
/***************************************************************************
Name                 : Mascaret
Description          : Pre and Postprocessing for Mascaret for QGIS
Date                 : June,2017
copyright            : (C) 2017 by Artelia
email                :
***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
"""
import os
from qgis.PyQt.QtCore import *
from qgis.PyQt.uic import *
from qgis.core import *
from qgis.gui import *
from qgis.utils import *

import datetime

from .GraphCommon import GraphCommon
from matplotlib.dates import date2num

if int(qVersion()[0]) < 5:  # qt4
    from qgis.PyQt.QtGui import *
else:  # qt5
    from qgis.PyQt.QtGui import QStandardItemModel, QStandardItem, QKeySequence
    from qgis.PyQt.QtWidgets import *


class ClassEventObsDialog(QDialog):
    def __init__(self, mgis):
        QDialog.__init__(self)
        self.mgis = mgis
        self.mdb = self.mgis.mdb
        self.filling_tab = False

        self.cur_station = ""
        self.cur_var = ""

        self.ui = loadUi(
            os.path.join(self.mgis.masplugPath, 'ui/ui_event_obs.ui'), self)

        self.ui.tab_values.sCut_del = QShortcut(QKeySequence("Del"), self)
        self.ui.tab_values.sCut_del.activated.connect(self.short_cut_row_del)

        styled_item_delegate = QStyledItemDelegate()
        styled_item_delegate.setItemEditorFactory(ItemEditorFactory())
        self.ui.tab_values.setItemDelegate(styled_item_delegate)

        self.ui.actionB_edit.triggered.connect(self.edit_station)
        self.ui.actionB_new.triggered.connect(self.new_station)
        self.ui.actionB_deleteV.triggered.connect(self.delete_var_station)
        self.ui.actionB_delete.triggered.connect(self.delete_station)
        self.ui.actionB_import.triggered.connect(self.import_csv)
        self.ui.actionB_addLine.triggered.connect(self.new_time)
        self.ui.actionB_delLine.triggered.connect(self.delete_time)
        self.ui.b_OK_page2.accepted.connect(self.accept_page2)
        self.ui.b_OK_page2.rejected.connect(self.reject_page2)
        self.ui.b_OK_page1.accepted.connect(self.reject)
        self.ui.cb_var.currentIndexChanged.connect(self.var_changed)

        self.init_ui()

    def init_ui(self):
        """ initializes GUI"""
        self.ui.Obs_pages.setCurrentIndex(0)
        self.graph_home = GraphObservation(self.mgis, self.ui.lay_graph_home)
        self.graph_edit = GraphObservation(self.mgis, self.ui.lay_graph_edit)
        self.fill_lst_stations()

    def fill_lst_stations(self, id=None):
        """
        Fill stations table in function of
        :param id: id of station
        :return:
        """
        model = QStandardItemModel()
        model.setColumnCount(3)
        model.setHorizontalHeaderLabels(['Station', 'H', 'Q'])
        self.ui.tab_stations.setModel(model)
        self.ui.tab_stations.setColumnWidth(0, 140)
        self.ui.tab_stations.setColumnWidth(1, 10)
        self.ui.tab_stations.setColumnWidth(2, 10)
        self.ui.tab_stations.selectionModel().selectionChanged.connect(
            self.station_changed)

        sql = "SELECT DISTINCT sta.code, not cnt_h isNull as h, not cnt_q isNull as q " \
              "FROM ({0}.observations as sta LEFT JOIN (SELECT code, count(*) as cnt_h FROM {0}.observations " \
              "WHERE type = 'H' GROUP BY code) as sta_h ON sta.code = sta_h.code) " \
              "LEFT JOIN (SELECT code, count(*) as cnt_q FROM {0}.observations " \
              "WHERE type = 'Q' GROUP BY code) as sta_q ON sta.code = sta_q.code " \
              "ORDER BY sta.code".format(self.mdb.SCHEMA)
        rows = self.mdb.run_query(sql, fetch=True)

        for i, row in enumerate(rows):
            for j, field in enumerate(row):
                new_itm = QStandardItem()
                if j == 0:
                    new_itm.setTextAlignment(Qt.AlignLeft | Qt.AlignVCenter)
                    txt = str(row[j]).strip()
                else:
                    new_itm.setTextAlignment(Qt.AlignHCenter | Qt.AlignVCenter)
                    if row[j] is True:
                        txt = "X"
                    else:
                        txt = ""
                new_itm.setText(txt)
                new_itm.setEditable(False)
                self.ui.tab_stations.model().setItem(i, j, new_itm)

        if id:
            for r in range(self.ui.tab_stations.model().rowCount()):
                if str(self.ui.tab_stations.model().item(r, 0).text()) == str(
                        id):
                    self.ui.tab_stations.setCurrentIndex(
                        self.ui.tab_stations.model().item(r, 0).index())
                    break
        else:
            self.station_changed()

    def station_changed(self):
        """
        graphic change  when the station change
        :return:
        """
        cur_var = self.ui.cb_var.currentText()
        if self.ui.tab_stations.selectedIndexes():
            l = self.ui.tab_stations.selectedIndexes()[0].row()
            self.cur_station = self.ui.tab_stations.model().item(l, 0).text()
        else:
            self.cur_station = ""

        self.ui.cb_var.blockSignals(True)
        self.ui.cb_var.clear()
        if self.cur_station:
            sql = "SELECT DISTINCT type FROM {0}.observations WHERE code = '{1}' ORDER BY type".format(
                self.mdb.SCHEMA,
                self.cur_station)
            rows = self.mdb.run_query(sql, fetch=True)
            for row in rows:
                self.ui.cb_var.addItem(row[0])
        self.ui.cb_var.setCurrentText(cur_var)
        self.ui.cb_var.blockSignals(False)
        self.var_changed()

    def var_changed(self):
        """ graphic change  when the variable changes"""
        self.cur_var = self.ui.cb_var.currentText()
        if self.cur_var:
            self.ui.b_edit.setText("Edit {} Values".format(self.cur_var))
            self.ui.b_deleteV.setText("Delete {} Values".format(self.cur_var))
            if self.cur_station:
                self.graph_home.init_graph([self.cur_station, self.cur_var])
            else:
                self.graph_home.init_graph(None)
        else:
            self.ui.b_edit.setText("Edit Values")
            self.ui.b_deleteV.setText("Delete Values")
            self.graph_home.init_graph(None)

    def create_tab_model(self, cur_var):
        """ create model table"""
        model = QStandardItemModel()
        model.insertColumns(0, 3)
        model.setHeaderData(0, 1, 'Date', 0)
        model.setHeaderData(1, 1, cur_var, 0)
        model.setHeaderData(2, 1, 'Comment', 0)
        model.itemChanged.connect(self.on_tab_data_change)
        return model

    def short_cut_row_del(self):
        """
        Delete station
        :return:
        """
        self.filling_tab = True
        upd = False
        if self.ui.tab_values.hasFocus():
            model = self.ui.tab_values.model()
            selection = self.ui.tab_values.selectedIndexes()
            for idx in selection:
                if idx.column() == 1:
                    model.item(idx.row(), idx.column()).setData(None, 0)
                    upd = True
                elif idx.column() == 2:
                    model.item(idx.row(), idx.column()).setData("", 0)
        self.filling_tab = False

        if upd:
            self.update_courbe()

    def fill_tab_values(self, cur_station, cur_var):
        """
        Fill tableau
        :param cur_station: Station name
        :param cur_var: Variable name
        :return:
        """
        self.filling_tab = True
        self.ui.tab_values.setModel(self.create_tab_model(cur_var))
        self.ui.tab_values.setColumnWidth(0, 120)
        self.ui.tab_values.setColumnWidth(1, 80)
        self.ui.tab_values.setColumnWidth(2, 120)
        model = self.ui.tab_values.model()

        if self.cur_station:
            sql = "SELECT date, valeur, comment FROM {0}.observations WHERE code = '{1}' AND type = '{2}' " \
                  "ORDER BY date".format(self.mdb.SCHEMA, cur_station, cur_var)
            rows = self.mdb.run_query(sql, fetch=True)
            for r, row in enumerate(rows):
                for c, val in enumerate(row):
                    itm = QStandardItem()
                    if c == 0:
                        itm.setData(QDateTime(val), 0)
                    else:
                        itm.setData(val, 0)
                    model.setItem(r, c, itm)

        self.txt_cur_station.setText(cur_station)
        self.txt_cur_var.setText(cur_var)

        self.filling_tab = False

    def import_csv(self):
        """ import CSV file"""
        file_name_path, _ = QFileDialog.getOpenFileNames(None, 'File Selection',
                                                         self.mgis.masplugPath,
                                                         filter="CSV (*.csv);;File (*)")
        succes, recs = self.read_csv(file_name_path)
        print(succes, len(recs))

        if succes:
            self.mdb.execute("DROP TABLE IF EXISTS {0}.tmp_observations".format(
                self.mdb.SCHEMA))
            self.mdb.execute("CREATE TABLE IF NOT EXISTS {0}.tmp_observations "
                             "AS TABLE {0}.observations WITH NO DATA".format(
                self.mdb.SCHEMA))
            sql = "INSERT INTO {0}.tmp_observations (code, date, type, comment, valeur) " \
                  "VALUES ({1})".format(self.mdb.SCHEMA, "{}, {}, {}, {}, {}")
            for rec in recs:
                self.mdb.execute(sql.format(*rec))

            dbls = self.mdb.run_query(
                "SELECT DISTINCT code, type FROM {0}.observations As obs WHERE EXISTS "
                "(SELECT 1 FROM {0}.tmp_observations AS tmp WHERE obs.code = tmp.code "
                "AND obs.date = tmp.date AND obs.type = tmp.type)".format(
                    self.mdb.SCHEMA),
                fetch=True)

        if dbls:
            txt_sta = ""
            for d, dbl in enumerate(dbls):
                if d < 12:
                    txt_sta += '- ' + dbl[0].strip() + ' : ' + dbl[1] + '\n'
                else:
                    txt_sta += '- and more ...\n'
                    break

            txt_mess = "Duplicates exist for these configurations : \n" + txt_sta + '\nOverwrite existing values ?'
            r = QMessageBox.question(self, "Observations Import", txt_mess,
                                     QMessageBox.Cancel | QMessageBox.No | QMessageBox.Yes)
            if r == QMessageBox.Yes:
                self.mdb.run_query(
                    "DELETE FROM {0}.observations As obs WHERE EXISTS "
                    "(SELECT 1 FROM {0}.tmp_observations AS tmp WHERE obs.code = tmp.code "
                    "AND obs.date = tmp.date AND obs.type = tmp.type)".format(
                        self.mdb.SCHEMA))
            elif r == QMessageBox.No:
                self.mdb.run_query(
                    "DELETE FROM {0}.tmp_observations As tmp WHERE EXISTS "
                    "(SELECT 1 FROM {0}.observations AS obs WHERE obs.code = tmp.code "
                    "AND obs.date = tmp.date AND obs.type = tmp.type)".format(
                        self.mdb.SCHEMA))
            elif r == QMessageBox.Cancel:
                return

        self.mdb.run_query(
            "INSERT INTO {0}.observations (code, date, type, comment, valeur) "
            "SELECT code, date, type, comment, valeur FROM {0}.tmp_observations".format(
                self.mdb.SCHEMA))

        self.mdb.execute(
            "DROP TABLE IF EXISTS {0}.tmp_observations".format(self.mdb.SCHEMA))

        self.fill_lst_stations(self.cur_station)

    def read_csv(self, data_file):
        try:
            recs = []
            for file in data_file:
                if os.path.isfile(file):
                    with open(file, 'r') as fichier:
                        codes = fichier.readline().strip().split(';')[1:]
                        types = fichier.readline().strip().split(';')[1:]
                        nom_stat = fichier.readline().strip().split(';')[1:]
                        for ligne in fichier:
                            temp = ligne.strip().split(';')
                            for i, val in enumerate(temp[1:]):
                                if float(val) != -99.99:
                                    rec = list()
                                    rec.append("'{}'".format(codes[i]))
                                    rec.append(
                                        "'{}'".format(self.fmt_date(temp[0])))
                                    rec.append("'{}'".format(types[i]))
                                    rec.append("'{}'".format(nom_stat[i]))
                                    rec.append(val)
                                    recs.append(rec)
            return True, recs
        except Exception as e:
            self.mgis.add_info("Loading to observations is an echec.")
            if self.mgis.DEBUG:
                self.mgis.add_info(repr(e))
            return False, None

    @staticmethod
    def fmt_date(date):
        return datetime.datetime.strptime(date, '%d/%m/%Y %H:%M')

    def on_tab_data_change(self, itm):
        if not self.filling_tab:
            if itm.column() == 0:
                model = itm.model()
                model.sort(0)
                self.ui.tab_values.scrollTo(itm.index(), 0)
                self.update_courbe()
            elif itm.column() == 1:
                self.update_courbe()

    def update_courbe(self):
        data = {}
        lx, ly = [], []
        for r in range(self.ui.tab_values.model().rowCount()):
            lx.append(date2num(
                self.ui.tab_values.model().item(r, 0).data(0).toPyDateTime()))
            ly.append(self.ui.tab_values.model().item(r, 1).data(0))
        data[0] = {"x": lx, "y": ly}
        self.graph_edit.maj_courbes(data)

    def new_station(self):
        # changer de page
        dlg = NewStationDialog()
        if dlg.exec():
            new_station = dlg.txt_station.text()
            new_var = dlg.cb_var.currentText()
            if new_station:
                rows = self.mdb.run_query(
                    "SELECT COUNT(*) FROM {0}.observations WHERE code = '{1}' "
                    "AND type ='{2}'".format(self.mdb.SCHEMA, new_station,
                                             new_var), fetch=True)
                if rows[0][0]:
                    QMessageBox.critical(self, "Error",
                                         "{} data set already exists for the {} station".format(
                                             new_var, new_station),
                                         QMessageBox.Ok)
                else:
                    self.tab_stations.clearSelection()
                    self.fill_tab_values(new_station, new_var)
                    self.ui.Obs_pages.setCurrentIndex(1)
                    self.graph_edit.init_graph([new_station, new_var])

    def edit_station(self):
        # charger les informations
        # changer de page
        if self.cur_station:
            self.fill_tab_values(self.cur_station, self.cur_var)
            self.ui.Obs_pages.setCurrentIndex(1)
            self.graph_edit.init_graph([self.cur_station, self.cur_var])

    def delete_station(self):
        # charger les informations
        # changer de page
        if self.cur_station:
            if (QMessageBox.question(self, "Observations of Events",
                                     "Delete {} observations ?".format(
                                         str(self.cur_station).strip()),
                                     QMessageBox.Cancel | QMessageBox.Ok)) == QMessageBox.Ok:
                if self.mgis.DEBUG:
                    self.mgis.add_info(
                        "Deletion of {} Observations of Events".format(
                            self.cur_station))
                self.mdb.execute(
                    "DELETE FROM {0}.observations WHERE code = '{1}'".format(
                        self.mdb.SCHEMA, self.cur_station))
                self.fill_lst_stations()

    def delete_var_station(self):
        # charger les informations
        # changer de page
        if self.cur_station:
            if (QMessageBox.question(self, "Observations of Events",
                                     "Delete {0} values for {1} station ?".format(
                                         self.cur_var,
                                         self.cur_station.strip()),
                                     QMessageBox.Cancel | QMessageBox.Ok)) == QMessageBox.Ok:
                if self.mgis.DEBUG:
                    self.mgis.add_info(
                        "Deletion of {} Observations of Events".format(
                            self.cur_station))
                self.mdb.execute(
                    "DELETE FROM {0}.observations WHERE code = '{1}' "
                    "and type = '{2}'".format(self.mdb.SCHEMA, self.cur_station,
                                              self.cur_var))
                self.fill_lst_stations(self.cur_station)

    def new_time(self):
        """ add line """
        self.filling_tab = True
        model = self.ui.tab_values.model()
        r = model.rowCount()
        model.insertRow(r)
        itm_date, itm_val, itm_com = QStandardItem(), QStandardItem(), QStandardItem()
        if r == 0:
            v_date = QDateTime().currentDateTime()
        elif r == 1:
            v_date = model.item(r - 1, 0).data(0).addDays(1)
        else:
            d = model.item(r - 2, 0).data(0).addDays(1).secsTo(
                model.item(r - 1, 0).data(0).addDays(1))
            v_date = model.item(r - 1, 0).data(0).addSecs(d)

        itm_date.setData(v_date, 0)
        itm_val.setData(None, 0)
        itm_com.setData("", 0)

        model.setItem(r, 0, itm_date)
        model.setItem(r, 1, itm_val)
        model.setItem(r, 2, itm_com)

        self.ui.tab_values.scrollToBottom()
        self.filling_tab = False
        self.update_courbe()

    def delete_time(self):
        """ delete line """
        if self.ui.tab_values.selectedIndexes():
            rows = [idx.row() for idx in self.ui.tab_values.selectedIndexes()]
            rows = list(set(rows))
            rows.sort(reverse=True)
            for row in rows:
                model = self.ui.tab_values.model()
                model.removeRow(row)
            self.update_courbe()

    def accept_page2(self):
        # save Info
        # modificaito liste page 1
        # change de page
        if self.ui.tab_values.model().rowCount() > 0:
            name_station = str(self.ui.txt_cur_station.text())
            name_var = str(self.ui.txt_cur_var.text())
            if self.cur_station == "":
                if self.mgis.DEBUG:
                    self.mgis.add_info(
                        "Addition of {0} Observations for {1}".format(name_var,
                                                                      name_station))
            else:
                if self.mgis.DEBUG:
                    self.mgis.add_info(
                        "Editing of {0} Observations for {1}".format(name_var,
                                                                     name_station))
                self.mdb.execute(
                    "DELETE FROM {0}.observations WHERE code = '{1}' AND type = '{2}'".format(
                        self.mdb.SCHEMA,
                        name_station, name_var))

            recs = []
            for r in range(self.ui.tab_values.model().rowCount()):
                recs.append([name_station,
                             self.ui.tab_values.model().item(r, 0).data(
                                 0).toPyDateTime(),
                             name_var,
                             self.ui.tab_values.model().item(r, 2).data(0),
                             self.ui.tab_values.model().item(r, 1).data(0)])
            self.mdb.run_query(
                "INSERT INTO {0}.observations (code, date, type, comment, valeur) VALUES (%s, %s, %s, %s, %s)".format(
                    self.mdb.SCHEMA), many=True, list_many=recs)

            self.fill_lst_stations(name_station)
            self.cb_var.setCurrentText(name_var)
            self.ui.Obs_pages.setCurrentIndex(0)
            self.graph_edit.init_graph(None)
        else:
            self.reject_page2()

    def reject_page2(self):
        """
        cancel button
        :return:
        """
        if self.mgis.DEBUG:
            self.mgis.add_info("Cancel of Observations of Events")
        self.ui.Obs_pages.setCurrentIndex(0)
        self.graph_edit.init_graph(None)


class ItemEditorFactory(QItemEditorFactory):
    # http://doc.qt.io/qt-5/qstyleditemdelegate.html#subclassing-qstyleditemdelegate
    # It is possible for a custom delegate to provide editors without the use of an editor item factory.
    # In this case, the following virtual functions must be reimplemented:
    def __init__(self):
        QItemEditorFactory.__init__(self)

    def createEditor(self, user_type, parent):
        if user_type == QVariant.Double or user_type == 0:
            double_spin_box = QDoubleSpinBox(parent)
            double_spin_box.setDecimals(4)
            double_spin_box.setMinimum(
                -99999.99)  # The default maximum value is 99.99.
            double_spin_box.setMaximum(
                99999.99)  # The default maximum value is 99.99.
            return double_spin_box
        else:
            return QItemEditorFactory().createEditor(user_type, parent)


class NewStationDialog(QDialog):
    """ window for New station button"""

    def __init__(self, flds=None, parent=None):
        super(NewStationDialog, self).__init__(parent)

        layout = QFormLayout()

        self.txt_station = QLineEdit()

        self.cb_var = QComboBox()
        self.cb_var.addItem('H')
        self.cb_var.addItem('Q')

        self.btn_box = QDialogButtonBox(self)
        self.btn_box.addButton("OK", 0)
        self.btn_box.addButton("Cancel", 1)

        self.btn_box.accepted.connect(self.accept)
        self.btn_box.rejected.connect(self.reject)

        layout.addRow(QLabel("Code"), self.txt_station)
        layout.addRow(QLabel("Type"), self.cb_var)
        layout.addRow(self.btn_box)

        self.setLayout(layout)


class GraphObservation(GraphCommon):
    """class Dialog GraphWaterQ"""

    def __init__(self, mgis=None, lay=None):
        GraphCommon.__init__(self, mgis)
        self.mdb = self.mgis.mdb
        self.init_ui_common_p()
        self.gui_graph(lay)
        self.init_ui()

    def init_ui(self):
        """ initializes  GUI """
        self.axes = self.fig.add_subplot(111)
        self.axes.tick_params(axis='both', labelsize=7.)
        self.axes.grid(True)

        self.courbe, = self.axes.plot([], [], zorder=99, label="None")
        self.courbes.append(self.courbe)

        self.fig.canvas.mpl_connect('pick_event', self.onpick)
        self.init_legende()

    def init_graph(self, config):
        """ initializes  Graphic """
        self.maj_unit_x("date")
        leglines = self.leg.get_lines()

        lst = [[], []]
        if config is not None:
            self.leg.get_texts()[0].set_text(config[1])
            sql = "SELECT date, valeur FROM {0}.observations " \
                  "WHERE code = '{1}' and type = '{2}' " \
                  "ORDER BY date".format(self.mdb.SCHEMA, config[0], config[1])
            rows = self.mdb.run_query(sql, fetch=True)
            if len(rows) > 0:
                lst = list(zip(*rows))
        else:
            self.leg.get_texts()[0].set_text("None")

        self.courbes[0].set_data([date2num(l) for l in lst[0]], lst[1])
        self.courbes[0].set_visible(True)
        leglines[0].set_alpha(1.0)

        self.maj_limites()
