# -*- 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 qgis.core import (QgsProcessingException,
                       QgsProcessingAlgorithm,
                       QgsProcessingParameterString,
                       QgsProcessingParameterEnum,
                       QgsProcessingParameterFile,
                       QgsApplication,
                       Qgis,
                       QgsSettings
                        )

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

class Backup(QgsProcessingAlgorithm):

    LOC = QgsApplication.locale()[:2]

    def tr(self, *string):
        return translate(string, self.LOC)

    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 'GeoOne,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="left">
                      <p>
                      <b><a href="'''+ self.tr('https://portal.geoone.com.br/m/lessons/postgis?classId=3433') + '''" target="_blank">'''+ self.tr('Click here to watch a full class on this tool',
                                    'Clique aqui para assistir uma aula completa sobre esta ferramenta') +'''</a></b>
                      </p>
                      <p>
                      <b><a href="'''+ self.tr('https://geoone.com.br/pvpostgis/') + '''" target="_blank">'''+ self.tr("Sign up for GeoOne's PostGIS course",
                                    'Inscreva-se no curso de PostGIS da GeoOne') +'</a><br><br>'+ self.tr('Author: Leandro Franca', 'Autor: Leandro França')+'''</b>
                      </p>'''+ social_BW + '''
                    </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', '14', '15', '16', '17', '18']

    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=Qgis.ProcessingFileParameterBehavior.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'
            )
        )

        my_settings = QgsSettings()
        postgresql_version = my_settings.value("LFTools/postgresql_version", 10)

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

    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
        )

        my_settings = QgsSettings()
        my_settings.setValue("LFTools/postgresql_version", version)

        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/'
        linux = '/usr/lib/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)
        elif os.path.isdir(linux):
            os.chdir(linux)
        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 {}
