# MainWindow.py -- Pamhyr
# Copyright (C) 2023  INRAE
#
# 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.
#
# This program 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 General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

# -*- coding: utf-8 -*-

import os
import sys
import logging
import subprocess
from queue import Queue

from PyQt5 import QtGui
from PyQt5.QtGui import (
    QKeySequence, QDesktopServices,
)

from PyQt5.QtCore import (
    QTranslator, QEvent, QUrl,
)
from PyQt5.QtWidgets import (
    QMainWindow, QApplication, QAction,
    QFileDialog, QShortcut, QMenu, QToolBar,
    QMessageBox,
)
from PyQt5.uic import loadUi

from View.Tools.ASubWindow import WindowToolKit
from View.Tools.ListedSubWindow import ListedSubWindow
from View.DummyWindow import DummyWindow

from View.Configure.Window import ConfigureWindow
from View.Study.Window import NewStudyWindow
from View.About.Window import AboutWindow
from View.Network.Window import NetworkWindow
from View.Geometry.Window import GeometryWindow
from View.BoundaryCondition.Window import BoundaryConditionWindow
from View.LateralContribution.Window import LateralContributionWindow
from View.InitialConditions.Window import InitialConditionsWindow
from View.Stricklers.Window import StricklersWindow
from View.Frictions.Window import FrictionsWindow
from View.SedimentLayers.Window import SedimentLayersWindow
from View.SedimentLayers.Reach.Window import ReachSedimentLayersWindow
from View.SolverParameters.Window import SolverParametersWindow
from View.RunSolver.Window import SelectSolverWindow, SolverLogWindow
from View.CheckList.Window import CheckListWindow
from View.Results.Window import ResultsWindow
from View.Debug.Window import ReplWindow

# Optional internal display of documentation for make the application
# package lighter...
try:
    from View.Doc.Window import DocWindow
    _doc = "internal"
except Exception as e:
    print("Handle exception: {e}")
    _doc = "external"

from Model.Study import Study

logger = logging.getLogger()

no_model_action = [
    "action_menu_new", "action_menu_open", "action_menu_import_mage",
    "action_menu_import_rubarbe", "action_toolBar_open",
]

model_action = [
    "action_menu_close", "action_menu_edit", "action_menu_save",
    "action_menu_save_as", "action_toolBar_close", "action_toolBar_save",
    "action_menu_numerical_parameter",
]

other_model_action = [
    "action_toolBar_run_solver", "action_toolBar_kill_solver"
]

define_model_action = [
    # Toolbar
    "action_toolBar_network", "action_toolBar_geometry",
    "action_toolBar_mesh", "action_toolBar_run_meshing_tool",
    "action_toolBar_boundary_cond", "action_toolBar_lateral_contrib",
    "action_toolBar_spills", "action_toolBar_frictions",
    "action_toolBar_stricklers", "action_toolBar_building",
    "action_toolBar_initial_cond",
    # Menu
    "action_menu_run_solver", "action_menu_numerical_parameter",
    "action_menu_edit_network", "action_menu_edit_geometry",
    "action_menu_boundary_conditions", "action_menu_initial_conditions",
    "action_menu_edit_friction", "action_menu_edit_lateral_contribution",
    "action_menu_run_solver", "action_menu_sediment_layers",
    "action_menu_edit_reach_sediment_layers"
]

action = (
    no_model_action + model_action + define_model_action
)


class ApplicationWindow(QMainWindow, ListedSubWindow, WindowToolKit):
    def __init__(self, conf=None):
        super(ApplicationWindow, self).__init__()

        self._close_question = False

        # App Configuration
        self.conf = conf

        # Model
        self._study = None

        # Results
        self._last_solver = None
        self._last_results = None

        # UI
        self.ui = loadUi(
            os.path.join(os.path.dirname(__file__), "ui", "MainWindow.ui"),
            self
        )

        self.setup_sc()
        self.setup_connection()
        self.default_style()
        self.setup_debug_mode(init=True)

        self.trans = QTranslator(self)
        # self.ui.retranslateUi()

        if self.conf.last_study != "" and not self.conf.close_correctly:
            self.dialog_reopen_study()

        if _doc == "external":
            logger.info("doc: Internal documentation is not available...")

    def set_title(self):
        title = "(dbg) " if self.conf.debug else ""

        if self._study is not None:
            title += f"Pamhyr2 - {self._study.name}"
            self.setWindowTitle(title)
        else:
            title += "Pamhyr2"
            self.setWindowTitle(title)

    def enable_actions(self, action: str, enable: bool):
        """Enable of disable an action componant

        Args:
            action: Action to enable/disable
            enable: True to Enable, or False to disable

        Returns:
            Nothing
        """
        logger.debug(f"Set {action} to {enable}")
        self.findChild(QAction, action).setEnabled(enable)

    def setup_sc(self):
        # self._run_sc = QShortcut(QKeySequence("F5"), self)
        return

    def setup_connection(self):
        """Connect action to callback function

        Returns:
            Nothing
        """
        actions = {
            # Menu action
            "action_menu_config": self.open_configure,
            "action_menu_new": self.open_new_study,
            "action_menu_edit": self.open_edit_study,
            "action_menu_open": self.open_model,
            "action_menu_save": self.save_study,
            "action_menu_save_as": self.save_as_study,
            "action_menu_numerical_parameter": self.open_solver_parameters,
            "action_menu_edit_network": self.open_network,
            "action_menu_edit_geometry": self.open_geometry,
            "action_menu_boundary_conditions": self.open_boundary_cond,
            "action_menu_initial_conditions": self.open_initial_conditions,
            "action_menu_edit_friction": self.open_frictions,
            "action_menu_edit_lateral_contribution": self.open_lateral_contrib,
            "action_menu_run_solver": self.run_solver,
            "action_menu_sediment_layers": self.open_sediment_layers,
            "action_menu_edit_reach_sediment_layers":
            self.open_reach_sediment_layers,
            "action_menu_close": self.close_model,
            "action_menu_results_last": self.open_last_results,
            # Help
            "action_menu_pamhyr_users_pdf":
            lambda: self.open_doc_user(ext="pdf"),
            "action_menu_pamhyr_developers_pdf":
            lambda: self.open_doc_dev(ext="pdf"),
            "action_menu_pamhyr_users_html":
            lambda: self.open_doc_user(ext="html"),
            "action_menu_pamhyr_developers_html":
            lambda: self.open_doc_dev(ext="html"),
            "action_menu_mage": self.open_doc_mage,
            "action_menu_about": self.open_about,
            # ToolBar action
            "action_toolBar_quit": self.close,
            "action_toolBar_open": self.open_model,
            "action_toolBar_save": self.save_study,
            "action_toolBar_close": self.close_model,
            "action_toolBar_run_solver": self.run_solver,
            # Current actions
            "action_toolBar_network": self.open_network,
            "action_toolBar_geometry": self.open_geometry,
            "action_toolBar_mesh": lambda: self.open_dummy("Mesh"),
            "action_toolBar_run_meshing_tool": self.open_solver_parameters,
            "action_toolBar_boundary_cond": self.open_boundary_cond,
            "action_toolBar_lateral_contrib": self.open_lateral_contrib,
            "action_toolBar_spills": lambda: self.open_dummy("Deversement"),
            "action_toolBar_stricklers": self.open_stricklers,
            "action_toolBar_frictions": self.open_frictions,
            "action_toolBar_building": lambda: self.open_dummy("Ouvrages"),
            "action_toolBar_initial_cond": self.open_initial_conditions,
        }

        for action in actions:
            logger.debug("Setup connection : " + action)
            self.findChild(QAction, action)\
                .triggered.connect(actions[action])
            # action.triggered.connect(actions[action])

        # self._run_sc.activated.connect(self.run_solver)

    def changeEvent(self, event):
        if event.type() == QEvent.LanguageChange:
            self.retranslateUi()
        super(ApplicationWindow, self).changeEvent(event)

    def close(self):
        if self._study is not None and not self._study.is_saved:
            self._close_question = True
            if self.dialog_close():
                # PAMHYR is close correctly (no crash)
                self.conf.set_close_correctly()

                super(ApplicationWindow, self).close()
            else:
                self._close_question = False
        else:
            # PAMHYR is close correctly (no crash)
            self.conf.set_close_correctly()

            super(ApplicationWindow, self).close()

    def closeEvent(self, event):
        if not self._close_question:
            if self._study is not None and not self._study.is_saved:
                if self.dialog_close(cancel=False):
                    # PAMHYR is close correctly (no crash)
                    self.conf.set_close_correctly()
                    super(ApplicationWindow, self).closeEvent(event)
        else:
            super(ApplicationWindow, self).closeEvent(event)

    def default_style(self):
        """Set default window style

        Returns:
            Nothing
        """
        self.update_enable_action()
        # Maximise window
        self.showMaximized()

    def set_debug_lvl(self, debug=True):
        if debug:
            logger.setLevel(logging.DEBUG)
            logger.info("Set logging level to DEBUG")
        else:
            logger.setLevel(logging.INFO)
            logger.info("Set logging level to INFO")

    def setup_debug_mode(self, init=False):
        menu = self.findChild(QMenu, "menu_help")
        self.set_title()

        if init:
            self.debug_action = QAction("Debug", self)
            self.debug_action.setStatusTip("Debug")
            self.debug_action.triggered.connect(self.open_debug)

            self.debug_sqlite_action = QAction("Debug SQLite", self)
            self.debug_sqlite_action.setStatusTip(
                "Open SQLite debuging tool (sqlitebrowser)")
            self.debug_sqlite_action.triggered.connect(self.open_sqlite)

            if self.conf.debug:
                menu.addAction(self.debug_action)
                menu.addAction(self.debug_sqlite_action)
                self.set_debug_lvl(debug=True)
        else:
            if self.conf.debug:
                menu.addAction(self.debug_action)
                menu.addAction(self.debug_sqlite_action)
                self.set_debug_lvl(debug=True)
            else:
                menu.removeAction(self.debug_action)
                menu.removeAction(self.debug_sqlite_action)
                self.set_debug_lvl(debug=False)

    #########
    # MODEL #
    #########

    def get_model(self):
        return self._study

    def set_model(self, model):
        self._study = model
        self.update_enable_action()
        self.conf.set_last_study(self._study.filename)
        self.set_title()

    def close_model(self):
        self._study = None
        self.update_enable_action()
        self.conf.set_close_correctly()
        self.set_title()

    def update_enable_action(self):
        """Update status of action componante

        Update status of action componant, enable or disable in
        function of model state

        Returns:
            Nothing
        """
        no_model = self._study is None

        for action in no_model_action:
            self.enable_actions(action, no_model)

        for action in define_model_action + other_model_action:
            self.enable_actions(action, not no_model)

        for action in model_action:
            self.enable_actions(action, not no_model)

    def set_results(self, solver, results):
        self._last_solver = solver
        self._last_results = results

        self.enable_actions("action_menu_results_last", True)

    ############
    # FEATURES #
    ############

    def open_study(self, filename):
        """Open a study

        Args:
            filename: The study path

        Returns:
            Nothing
        """
        self.set_model(Study.open(filename))
        logger.info(f"Open Study - {self._study.name}")
        self.set_title()

    def save_study(self):
        """Save current study

        Save current study, if study as no associate file, open a
        file dialog.

        Returns:
            Nothing
        """
        if self._study.filename is None or self._study.filename == "":
            file_name, _ = QFileDialog.getSaveFileName(
                self, "Save File",
                "", "Pamhyr(*.pamhyr)"
            )

            if file_name.rsplit(".", 1)[-1] == "pamhyr":
                self._study.filename = file_name
            else:
                self._study.filename = file_name + ".pamhyr"

        if self._study.is_saved:
            return

        logger.info("Save...")
        self._study.save()

    def save_as_study(self):
        """Save current study as new file

        Save current study as new file, if study as no associate file,
        open a file dialog.

        Returns:
            Nothing
        """
        file_name, _ = QFileDialog.getSaveFileName(
            self, "Save File",
            "", "Pamhyr(*.pamhyr)"
        )

        if file_name[-4:] == ".pamhyr":
            self._study.filename = file_name
        else:
            self._study.filename = file_name + ".pamhyr"

        self._study.save()

    ##################
    # MSG AND DIALOG #
    ##################

    def msg_select_reach(self):
        self.message_box("Please select a reach",
                         "Geometry edition need a reach selected "
                         "into river network window to work on it")

    def dialog_reopen_study(self):
        dlg = QMessageBox(self)

        dlg.setWindowTitle("Last open study")
        dlg.setText("Do you want to open again the last open study?")
        opt = QMessageBox.Cancel | QMessageBox.Ok  # | QMessageBox.Open

        dlg.setStandardButtons(opt)
        dlg.setIcon(QMessageBox.Question)

        res = dlg.exec()

        if res == QMessageBox.Ok:
            self.open_study(self.conf.last_study)
            return True
        elif res == QMessageBox.Open:
            self.open_model()
            return True
        elif res == QMessageBox.Cancel:
            return False

    def dialog_close(self, cancel=True):
        dlg = QMessageBox(self)

        dlg.setWindowTitle("Close PAMHYR without saving study")
        dlg.setText("Do you want to save current study before PAMHYR close ?")
        opt = QMessageBox.Save | QMessageBox.Ignore
        if cancel:
            opt |= QMessageBox.Cancel

        dlg.setStandardButtons(opt)
        dlg.setIcon(QMessageBox.Warning)

        res = dlg.exec()

        if res == QMessageBox.Save:
            self.save_study()
            return True
        elif res == QMessageBox.Ignore:
            return True
        elif res == QMessageBox.Cancel:
            return False

    #############
    # SUBWINDOW #
    #############

    def open_configure(self):
        """Open configure window

        Open PamHyr configure window

        Returns:
            Nothing
        """
        if self.sub_window_exists(
            ConfigureWindow,
            data=[None, self.conf]
        ):
            return

        self.config = ConfigureWindow(config=self.conf, parent=self)
        self.config.show()

    def open_about(self):
        """Open about window

        Open a new window with information about PamHyr

        Returns:
            Nothing
        """
        if self.sub_window_exists(
            AboutWindow,
            data=[None, None]
        ):
            return

        self.about = AboutWindow(parent=self)
        self.about.show()

    def open_model(self):
        """Open file dialog to select saved model

        Returns:
            Nothing
        """
        if self._study is None:
            dialog = QFileDialog(self)
            dialog.setFileMode(QFileDialog.FileMode.ExistingFile)
            dialog.setDefaultSuffix(".pamhyr")
            # dialog.setFilter(dialog.filter() | QtCore.QDir.Hidden)
            dialog.setNameFilters(['PamHyr (*.pamhyr)'])
            dialog.setDirectory(os.path.dirname(self.conf.last_study))

            if dialog.exec_():
                file_name = dialog.selectedFiles()
                self.open_study(file_name[0])

    def open_new_study(self):
        """Open dialog to set new study

        Returns:
            Nothing
        """
        if self._study is None:
            if self.sub_window_exists(
                NewStudyWindow,
                data=[None, None]
            ):
                return

            self.new_study = NewStudyWindow(parent=self)
            self.new_study.show()

    def open_edit_study(self):
        """Open dialog to set new study

        Returns:
            Nothing
        """
        if self._study is not None:
            if self.sub_window_exists(
                NewStudyWindow,
                data=[self._study, None]
            ):
                return

            self.new_study = NewStudyWindow(study=self._study, parent=self)
            self.new_study.show()

    def open_network(self):
        """Open network dialog

        Returns:
            Nothing
        """
        if self._study is not None:
            if self.sub_window_exists(
                NetworkWindow,
                data=[self._study, None]
            ):
                return

            self.network = NetworkWindow(study=self._study, parent=self)
            self.network.show()

    def open_geometry(self):
        """Open geometry window

        Returns:
            Nothing
        """
        if (self._study is not None and self._study.river.has_current_reach()):
            reach = self._study.river.current_reach().reach

            if self.sub_window_exists(
                GeometryWindow,
                data=[self._study, self.conf, reach]
            ):
                return

            geometry = GeometryWindow(
                study=self._study,
                config=self.conf,
                reach=reach,
                parent=self
            )
            geometry.show()
        else:
            self.msg_select_reach()

    def open_boundary_cond(self):
        if self.sub_window_exists(
            BoundaryConditionWindow,
            data=[self._study, None]
        ):
            return

        bound = BoundaryConditionWindow(study=self._study, parent=self)
        bound.show()

    def open_lateral_contrib(self):
        if self.sub_window_exists(
            LateralContributionWindow,
            data=[self._study, None]
        ):
            return

        lateral = LateralContributionWindow(study=self._study, parent=self)
        lateral.show()

    def open_stricklers(self):
        if self.sub_window_exists(
            StricklersWindow,
            data=[self._study, self.conf]
        ):
            return

        strick = StricklersWindow(
            study=self._study,
            config=self.conf,
            parent=self
        )
        strick.show()

    def open_frictions(self):
        if self._study is not None:
            if self._study.river.has_current_reach():
                reach = self._study.river.current_reach()

                if self.sub_window_exists(
                    FrictionsWindow,
                    data=[self._study, None, reach]
                ):
                    return

                frictions = FrictionsWindow(
                    study=self._study,
                    parent=self
                )
                frictions.show()
            else:
                self.msg_select_reach()

    def open_initial_conditions(self):
        if self._study.river.has_current_reach():
            reach = self._study.river.current_reach()

            if self.sub_window_exists(
                InitialConditionsWindow,
                data=[self._study, self.conf, reach]
            ):
                return

            initial = InitialConditionsWindow(
                study=self._study,
                config=self.conf,
                reach=reach,
                parent=self
            )
            initial.show()
        else:
            self.msg_select_reach()

    def open_solver_parameters(self):
        if self.sub_window_exists(
            SolverParametersWindow,
            data=[self._study, None]
        ):
            return

        params = SolverParametersWindow(
            study=self._study,
            parent=self
        )
        params.show()

    def open_sediment_layers(self):
        if self.sub_window_exists(
            SedimentLayersWindow,
            data=[self._study, None]
        ):
            return

        sl = SedimentLayersWindow(
            study=self._study,
            parent=self
        )
        sl.show()

    def open_reach_sediment_layers(self):
        reach = self._study.river.current_reach().reach

        if self.sub_window_exists(
            ReachSedimentLayersWindow,
            data=[self._study, None, reach]
        ):
            return

        sl = ReachSedimentLayersWindow(
            study=self._study,
            reach=reach,
            parent=self
        )
        sl.show()

    def run_solver(self):
        if self._study is None:
            return

        run = SelectSolverWindow(
            study=self._study,
            config=self.conf,
            parent=self
        )
        if run.exec():
            solver = run.solver

            if self.sub_window_exists(
                CheckListWindow,
                data=[
                    self._study,
                    self.conf,
                    solver
                ]
            ):
                return

            check = CheckListWindow(
                study=self._study,
                config=self.conf,
                solver=solver,
                parent=self
            )
            check.show()

    def solver_log(self, solver):
        sol = SolverLogWindow(
            study=self._study,
            config=self.conf,
            solver=solver,
            parent=self
        )
        sol.show()

    def open_solver_results(self, solver, results=None):
        # If no specific results, get last results
        if results is None:
            results = self._last_results

        # No results available
        if results is None:
            return

        # Windows already opened
        if self.sub_window_exists(
                ResultsWindow,
                data=[
                    self._study,
                    None,       # No config
                    solver,
                    results
                ]
        ):
            return

        res = ResultsWindow(
            study=self._study,
            solver=solver,
            results=results,
            parent=self
        )
        res.show()

    def open_last_results(self):
        if self._last_solver is None or self._last_results is None:
            return

        self.open_solver_results(self._last_solver, self._last_results)

    #################
    # DOCUMENTATION #
    #################

    def _doc_path_file(self, filename):
        if ".py" in sys.argv[0]:
            return os.path.abspath(
                os.path.join(
                    os.path.dirname(__file__),
                    "..", "..", "doc", filename
                )
            )

        return os.path.abspath(
            os.path.join(
                os.path.dirname(__file__),
                "..", "..", "..", "doc", filename
            )
        )

    def open_doc(self, filename):
        if _doc == "external":
            url = QUrl(f"file://{self._doc_path_file(filename)}")
            QDesktopServices.openUrl(url)
        else:
            if ".odt" in filename:
                url = QUrl(f"file://{DocWindow._path_file(filename)}")
                QDesktopServices.openUrl(url)
            else:
                doc = DocWindow(
                    filename=filename,
                    parent=self
                )
                doc.show()

    def open_doc_user(self, ext="pdf"):
        self.open_doc(f"Pamhyr2-users.{ext}")

    def open_doc_dev(self, ext="pdf"):
        self.open_doc(f"Pamhyr2-dev.{ext}")

    def open_doc_mage(self):
        self.open_doc("Mage-8.odt")

    #########
    # DEBUG #
    #########

    def open_debug(self):
        repl = ReplWindow(
            study=self._study,
            config=self.conf,
            parent=self
        )
        repl.show()

    def open_sqlite(self):
        if self._study is None:
            logger.debug("No study open for sql debuging...")
            return

        file = self._study.filename
        _ = subprocess.Popen(
            f"sqlitebrowser {file}",
            shell=True
        )

    # TODO: Delete me !
    ###############
    # DUMMY STUFF #
    ###############

    def open_dummy(self, title="Dummy"):
        self.dummy = DummyWindow(
            title=title if type(title) is str else "Dummy",
            parent=self
        )
        self.dummy.show()
