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

"""
***************************************************************************
    ConfigDialog.py
    ---------------------
    Date                 : August 2012
    Copyright            : (C) 2012 by Victor Olaya
    Email                : volayaf at gmail dot com
***************************************************************************
*                                                                         *
*   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 2 of the License, or     *
*   (at your option) any later version.                                   *
*                                                                         *
***************************************************************************
"""

__author__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'

# This will get replaced with a git SHA1 when you do a git archive

__revision__ = '$Format:%H$'

import os

from PyQt4 import uic
from PyQt4.QtCore import Qt, QEvent
from PyQt4.QtGui import (QFileDialog, QDialog, QIcon, QStyle,
    QStandardItemModel, QStandardItem, QMessageBox, QStyledItemDelegate,
    QLineEdit, QSpinBox, QDoubleSpinBox, QWidget, QToolButton, QHBoxLayout)

from processing.core.ProcessingConfig import ProcessingConfig
from processing.core.Processing import Processing

pluginPath = os.path.split(os.path.dirname(__file__))[0]
WIDGET, BASE = uic.loadUiType(
    os.path.join(pluginPath, 'ui', 'DlgConfig.ui'))


class ConfigDialog(BASE, WIDGET):

    def __init__(self, toolbox):
        super(ConfigDialog, self).__init__(None)
        self.setupUi(self)

        self.toolbox = toolbox
        self.groupIcon = QIcon()
        self.groupIcon.addPixmap(self.style().standardPixmap(
            QStyle.SP_DirClosedIcon), QIcon.Normal, QIcon.Off)
        self.groupIcon.addPixmap(self.style().standardPixmap(
            QStyle.SP_DirOpenIcon), QIcon.Normal, QIcon.On)

        if hasattr(self.searchBox, 'setPlaceholderText'):
            self.searchBox.setPlaceholderText(self.tr('Search...'))

        self.model = QStandardItemModel()
        self.tree.setModel(self.model)

        self.delegate = SettingDelegate()
        self.tree.setItemDelegateForColumn(1, self.delegate)

        self.searchBox.textChanged.connect(self.fillTree)

        self.fillTree()

        self.tree.expanded.connect(self.adjustColumns)

    def fillTree(self):
        self.items = {}
        self.model.clear()
        self.model.setHorizontalHeaderLabels([self.tr('Setting'),
                self.tr('Value')])

        text = unicode(self.searchBox.text())
        settings = ProcessingConfig.getSettings()

        rootItem = self.model.invisibleRootItem()
        priorityKeys = [self.tr('General'), self.tr('Models'), self.tr('Scripts')]
        for group in priorityKeys:
            groupItem = QStandardItem(group)
            icon = ProcessingConfig.getGroupIcon(group)
            groupItem.setIcon(icon)
            groupItem.setEditable(False)
            emptyItem = QStandardItem()
            emptyItem.setEditable(False)
            rootItem.insertRow(0, [groupItem, emptyItem])
            for setting in settings[group]:
                if setting.hidden:
                    continue

                if text == '' or text.lower() in setting.description.lower():
                    labelItem = QStandardItem(setting.description)
                    labelItem.setIcon(icon)
                    labelItem.setEditable(False)
                    self.items[setting] = SettingItem(setting)
                    groupItem.insertRow(0, [labelItem, self.items[setting]])

            if text != '':
                self.tree.expand(groupItem.index())

        providersItem = QStandardItem(self.tr('Providers'))
        icon = QIcon(os.path.join(pluginPath, 'images', 'alg.png'))
        providersItem.setIcon(icon)
        providersItem.setEditable(False)
        emptyItem = QStandardItem()
        emptyItem.setEditable(False)
        rootItem.insertRow(0, [providersItem, emptyItem])
        for group in settings.keys():
            if group in priorityKeys:
                continue

            groupItem = QStandardItem(group)
            icon = ProcessingConfig.getGroupIcon(group)
            groupItem.setIcon(icon)
            groupItem.setEditable(False)
            for setting in settings[group]:
                if setting.hidden:
                    continue

                if text == '' or text.lower() in setting.description.lower():
                    labelItem = QStandardItem(setting.description)
                    labelItem.setIcon(icon)
                    labelItem.setEditable(False)
                    self.items[setting] = SettingItem(setting)
                    groupItem.insertRow(0, [labelItem, self.items[setting]])

            emptyItem = QStandardItem()
            emptyItem.setEditable(False)
            providersItem.appendRow([groupItem, emptyItem])

        self.tree.sortByColumn(0, Qt.AscendingOrder)
        self.adjustColumns()

    def accept(self):
        for setting in self.items.keys():
            if isinstance(setting.value, bool):
                setting.value = self.items[setting].checkState() == Qt.Checked
            elif isinstance(setting.value, (float, int, long)):
                value = unicode(self.items[setting].text())
                try:
                    value = float(value)
                    setting.value = value
                except ValueError:
                    QMessageBox.critical(self, self.tr('Wrong value'),
                            self.tr('Wrong parameter value:\n%1') % value)
                    return
            else:
                setting.value = unicode(self.items[setting].text())
            setting.save()
        Processing.updateAlgsList()

        QDialog.accept(self)

    def adjustColumns(self):
        self.tree.resizeColumnToContents(0)
        self.tree.resizeColumnToContents(1)


class SettingItem(QStandardItem):

    def __init__(self, setting):
        QStandardItem.__init__(self)
        self.setting = setting

        if isinstance(setting.value, bool):
            self.setCheckable(True)
            self.setEditable(False)
            if setting.value:
                self.setCheckState(Qt.Checked)
            else:
                self.setCheckState(Qt.Unchecked)
        else:
            self.setData(setting.value, Qt.EditRole)


class SettingDelegate(QStyledItemDelegate):

    def __init__(self, parent=None):
        QStyledItemDelegate.__init__(self, parent)

    def createEditor(
        self,
        parent,
        options,
        index,
    ):
        value = self.convertValue(index.model().data(index, Qt.EditRole))
        if isinstance(value, (int, long)):
            spnBox = QSpinBox(parent)
            spnBox.setRange(-999999999, 999999999)
            return spnBox
        elif isinstance(value, float):
            spnBox = QDoubleSpinBox(parent)
            spnBox.setRange(-999999999.999999, 999999999.999999)
            spnBox.setDecimals(6)
            return spnBox
        elif isinstance(value, (str, unicode)):
            if os.path.isdir(value):
                return FileDirectorySelector(parent)
            elif os.path.isfile(value):
                return FileDirectorySelector(parent, True)
            else:
                return FileDirectorySelector(parent, True)

    def setEditorData(self, editor, index):
        value = self.convertValue(index.model().data(index, Qt.EditRole))
        if isinstance(value, (int, long)):
            editor.setValue(value)
        elif isinstance(value, float):
            editor.setValue(value)
        elif isinstance(value, (str, unicode)):
            editor.setText(value)

    def setModelData(self, editor, model, index):
        value = self.convertValue(index.model().data(index, Qt.EditRole))
        if isinstance(value, (int, long)):
            model.setData(index, editor.value(), Qt.EditRole)
        elif isinstance(value, float):
            model.setData(index, editor.value(), Qt.EditRole)
        elif isinstance(value, (str, unicode)):
            model.setData(index, editor.text(), Qt.EditRole)

    def sizeHint(self, option, index):
        return QSpinBox().sizeHint()

    def eventFilter(self, editor, event):
        if event.type() == QEvent.FocusOut and hasattr(editor, 'canFocusOut'):
            if not editor.canFocusOut:
                return False
        return QStyledItemDelegate.eventFilter(self, editor, event)

    def convertValue(self, value):
        if value is None:
            return ""
        try:
            return int(value)
        except ValueError:
            try:
                return float(value)
            except ValueError:
                return unicode(value)


class FileDirectorySelector(QWidget):

    def __init__(self, parent=None, selectFile=False):
        QWidget.__init__(self, parent)

        # create gui
        self.btnSelect = QToolButton()
        self.btnSelect.setText(self.tr('...'))
        self.lineEdit = QLineEdit()
        self.hbl = QHBoxLayout()
        self.hbl.setMargin(0)
        self.hbl.setSpacing(0)
        self.hbl.addWidget(self.lineEdit)
        self.hbl.addWidget(self.btnSelect)

        self.setLayout(self.hbl)

        self.canFocusOut = False
        self.selectFile = selectFile

        self.setFocusPolicy(Qt.StrongFocus)
        self.btnSelect.clicked.connect(self.select)

    def select(self):
        lastDir = ''
        if not self.selectFile:
            selectedPath = QFileDialog.getExistingDirectory(None,
                self.tr('Select directory'), lastDir,
                QFileDialog.ShowDirsOnly)
        else:
            selectedPath = QFileDialog.getOpenFileName(None,
                self.tr('Select file'), lastDir, self.tr('All files (*.*)')
            )

        if not selectedPath:
            return

        self.lineEdit.setText(selectedPath)
        self.canFocusOut = True

    def text(self):
        return self.lineEdit.text()

    def setText(self, value):
        self.lineEdit.setText(value)
