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

"""
Post_Backup.py
***************************************************************************
*                                                                         *
*   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__ = 'Leandro França'
__date__ = '2021-03-09'
__copyright__ = '(C) 2020, Leandro França'

from PyQt5.QtCore import QCoreApplication, QVariant
from qgis.core import (QgsProcessing,
                       QgsProcessingException,
                       QgsProcessingAlgorithm,
                       QgsProcessingParameterString,
                       QgsProcessingParameterBoolean,
                       QgsProcessingParameterEnum,
                       QgsProcessingParameterRasterLayer,
                       QgsProcessingParameterFile,
                       QgsProcessingParameterFileDestination,
                       QgsApplication,
                       QgsRasterLayer,
                       QgsCoordinateReferenceSystem)

from lftools.geocapt.imgs import Imgs
import os
from datetime import datetime
from qgis.PyQt.QtGui import QIcon

class Backup(QgsProcessingAlgorithm):

    LOC = QgsApplication.locale()[:2]

    def translate(self, string):
        return QCoreApplication.translate('Processing', string)

    def tr(self, *string):
        # Traduzir para o portugês: arg[0] - english (translate), arg[1] - português
        if self.LOC == 'pt':
            if len(string) == 2:
                return string[1]
            else:
                return self.translate(string[0])
        else:
            return self.translate(string[0])

    def createInstance(self):
        return Backup()

    def name(self):
        return 'backup'

    def displayName(self):
        return self.tr('Backup database', 'Backup de BD')

    def group(self):
        return self.tr('PostGIS')

    def groupId(self):
        return 'postgis'

    def tags(self):
        return self.tr('postgis,postgresql,database,BD,DB,restore,backup,manager,export').split(',')

    def icon(self):
        return QIcon(os.path.join(os.path.dirname(os.path.dirname(__file__)), 'images/postgis.png'))

    txt_en = 'This tool creates a <b>backup</b> file in the "<b>.sql</b>" format for a PostgreSQL server database.'
    txt_pt = 'Esta ferramenta gera um arquivo de <b>backup</b> no formato "<b>.sql</b>" para um banco de dados de um servidor PostgreSQL.'
    figure = 'images/tutorial/post_backup.jpg'

    def shortHelpString(self):
        social_BW = Imgs().social_BW
        footer = '''<div align="center">
                      <img src="'''+ os.path.join(os.path.dirname(os.path.dirname(__file__)), self.figure) +'''">
                      </div>
                      <div align="right">
                      <p align="right">
                      <b>'''+self.tr('Author: Leandro Franca', 'Autor: Leandro França')+'''</b>
                      </p>'''+ social_BW + '''</div>
                    </div>'''
        return self.tr(self.txt_en, self.txt_pt) + footer


    FOLDER ='FOLDER'
    DATABASE = 'DATABASE'
    HOST = 'HOST'
    USER = 'USER'
    PORT = 'PORT'
    VERSION = 'VERSION'
    versions = ['9.5', '9.6', '10', '11', '12', '13']

    def initAlgorithm(self, config=None):
        # INPUT
        self.addParameter(
            QgsProcessingParameterFile(
                self.FOLDER,
                self.tr('Folder to save the backup file', 'Pasta para salvar o arquivo de backup'),
                behavior=QgsProcessingParameterFile.Folder,
                defaultValue=None
            )
        )

        self.addParameter(
            QgsProcessingParameterString(
                self.DATABASE,
                self.tr('Database name', 'Nome do banco de dados')
            )
        )

        self.addParameter(
            QgsProcessingParameterString(
                self.HOST,
                self.tr('Host', 'Host'),
                defaultValue = 'localhost'
            )
        )

        self.addParameter(
            QgsProcessingParameterString(
                self.USER,
                self.tr('User', 'Usuário'),
                defaultValue = 'postgres'
            )
        )

        self.addParameter(
            QgsProcessingParameterEnum(
                self.VERSION,
                self.tr('PostgreSQL version', 'Versão do PostgreSQL'),
				options = self.versions,
                defaultValue= 2
            )
        )

    def processAlgorithm(self, parameters, context, feedback):

        path = self.parameterAsFile(
            parameters,
            self.FOLDER,
            context
        )
        if not path:
            raise QgsProcessingException(self.invalidSourceError(parameters, self.FOLDER))

        DB = self.parameterAsString(
            parameters,
            self.DATABASE,
            context
        )
        if not DB or DB == '' or ' ' in DB:
            raise QgsProcessingException(self.invalidSourceError(parameters, self.DATABASE))

        host = self.parameterAsString(
            parameters,
            self.HOST,
            context
        )

        version = self.parameterAsEnum(
            parameters,
            self.VERSION,
            context
        )
        version = self.versions[version]

        user = self.parameterAsString(
            parameters,
            self.USER,
            context
        )

        # Procurando arquivo psql
        win64 = 'C:/Program Files (x86)/PostgreSQL/'+version+'/bin'
        win64d = 'D:/Program Files (x86)/PostgreSQL/'+version+'/bin'
        win32 = 'C:/Program Files/PostgreSQL/'+version+'/bin'
        win32d = 'D:/Program Files/PostgreSQL/'+version+'/bin'
        mac = '/Library/PostgreSQL/'+version+'/bin/'
        if os.path.isdir(win64):
            os.chdir(win64)
        elif os.path.isdir(win64d):
            os.chdir(win64d)
        elif os.path.isdir(win32):
            os.chdir(win32)
        elif os.path.isdir(win32d):
            os.chdir(win32d)
        elif os.path.isdir(mac):
            os.chdir(mac)
        else:
            raise QgsProcessingException(self.tr('Make sure your PostgreSQL version is correct!', 'Verifique se a versão do seu PostgreSQL está correta!'))

        # Realizando o Backup
        file_path = os.path.join(path, DB + '.sql')
        comando = 'pg_dump -Fp -C -h ' + host + ' -U ' + user + ' ' + DB + ' > "' + file_path + '"'
        feedback.pushInfo('\n' + self.tr('Command: ','Comando: ') + comando)
        feedback.pushInfo('\n' + self.tr('Starting DB Backup process...', 'Iniciando processo de Backup do BD...'))
        result = os.system(comando)

        if result==0:
            datahora = datetime.now().strftime("_%Y-%m-%d_%H-%M-%S")
            os.rename(file_path, os.path.join(path, DB + datahora + '.sql'))
            feedback.pushInfo(self.tr('Operation completed successfully!', 'Operação finalizada com sucesso!'))
            feedback.pushInfo(self.tr('Leandro Franca - Cartographic Engineer', 'Leandro França - Eng Cart'))
        else:
            feedback.pushInfo(self.tr('There was a problem while executing the command. Please check the input parameters.',
                                      'Houve algum problema durante a execução do comando. Por favor, verifique os parâmetros de entrada.'))

        return {}
