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

"""
***************************************************************************
    HelpEditionDialog.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
import pickle
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *
from processing.ui.ui_DlgHelpEdition import Ui_DlgHelpEdition


class HelpEditionDialog(QDialog, Ui_DlgHelpEdition):

    ALG_DESC = 'ALG_DESC'
    ALG_CREATOR = 'ALG_CREATOR'
    ALG_HELP_CREATOR = 'ALG_HELP_CREATOR'

    def __init__(self, alg):
        QDialog.__init__(self)

        self.setupUi(self)

        self.alg = alg
        self.descriptions = {}
        if self.alg.descriptionFile is not None:
            helpfile = alg.descriptionFile + '.help'
            if os.path.exists(helpfile):
                f = open(helpfile, 'rb')
                self.descriptions = pickle.load(f)
        self.currentName = self.ALG_DESC
        if self.ALG_DESC in self.descriptions:
            self.text.setText(self.descriptions[self.ALG_DESC])
        self.tree.itemClicked.connect(self.changeItem)

        self.fillTree()
        self.updateHtmlView()

    def reject(self):
        self.descriptions = None
        QDialog.reject(self)

    def accept(self):
        self.descriptions[self.currentName] = unicode(self.text.toPlainText())
        if self.alg.descriptionFile is not None:
            try:
                f = open(self.alg.descriptionFile + '.help', 'wb')
                pickle.dump(self.descriptions, f)
                f.close()
            except Exception, e:
                QMessageBox.warning(self, 'Error saving help file',
                                    'Help file could not be saved. Check that \
                                    you have permission to modify the help \
                                    file. You might not have permission if \
                                    you are editing an example model or \
                                    script, since they are stored on the \
                                    installation folder')

        QDialog.accept(self)

    def getHtml(self):
        s = '<h2>Algorithm description</h2>\n'
        s += '<p>' + self.getDescription(self.ALG_DESC) + '</p>\n'
        s += '<h2>Input parameters</h2>\n'
        for param in self.alg.parameters:
            s += '<h3>' + param.description + '</h3>\n'
            s += '<p>' + self.getDescription(param.name) + '</p>\n'
        s += '<h2>Outputs</h2>\n'
        for out in self.alg.outputs:
            s += '<h3>' + out.description + '</h3>\n'
            s += '<p>' + self.getDescription(out.name) + '</p>\n'
        return s

    def fillTree(self):
        item = TreeDescriptionItem('Algorithm description', self.ALG_DESC)
        self.tree.addTopLevelItem(item)
        parametersItem = TreeDescriptionItem('Input parameters', None)
        self.tree.addTopLevelItem(parametersItem)
        for param in self.alg.parameters:
            item = TreeDescriptionItem(param.description, param.name)
            parametersItem.addChild(item)
        outputsItem = TreeDescriptionItem(self.tr('Outputs'), None)
        self.tree.addTopLevelItem(outputsItem)
        for out in self.alg.outputs:
            item = TreeDescriptionItem(out.description, out.name)
            outputsItem.addChild(item)
        item = TreeDescriptionItem('Algorithm created by', self.ALG_CREATOR)
        self.tree.addTopLevelItem(item)
        item = TreeDescriptionItem('Algorithm help written by',
                                   self.ALG_HELP_CREATOR)
        self.tree.addTopLevelItem(item)

    def changeItem(self):
        item = self.tree.currentItem()
        if isinstance(item, TreeDescriptionItem):
            if self.currentName:
                self.descriptions[self.currentName] = \
                    unicode(self.text.toPlainText())
            name = item.name
            if name:
                self.text.setEnabled(True)
                self.updateHtmlView()
                self.currentName = name
                if name in self.descriptions:
                    self.text.setText(self.descriptions[name])
                else:
                    self.text.clear()
            else:
                self.currentName = None
                self.text.clear()
                self.text.setEnabled(False)
                self.updateHtmlView()

    def updateHtmlView(self):
        self.webView.setHtml(self.getHtml())

    def getDescription(self, name):
        if name in self.descriptions:
            return self.descriptions[name].replace('\n', '<br>')
        else:
            return ''


class TreeDescriptionItem(QTreeWidgetItem):

    def __init__(self, description, name):
        QTreeWidgetItem.__init__(self)
        self.name = name
        self.description = description
        self.setText(0, description)