#!/usr/bin/python3

# MIT License

# Copyright (c) 2024 Thomas Williams - https://git.server.wales/thomas

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

import pyodbc
import time
from odbcReferences import driver
from config import logRetentionDays, maximumSQLAttempts, loggingMode
from datetime import datetime, timedelta

class logsManager:
    
    def __init__(self, server, database, username, password):

        self.conn_str = 'DRIVER=' + driver + ';SERVER=' + server + ';DATABASE=' + database + ';UID=' + username + ';PWD=' + password

    def insertHost(self, hostname, ipAddress):

        currentAttempts = 1

        while currentAttempts <= maximumSQLAttempts:

            try:

                conn = pyodbc.connect(self.conn_str)
                cursor = conn.cursor()
                cursor.execute("SELECT COUNT(*) FROM monutil_hosts WHERE hostname = ?", hostname)

                if cursor.fetchone()[0] == 0:

                    cursor.execute("INSERT INTO monutil_hosts (hostname, ipAddress) VALUES (?, ?)", hostname, ipAddress)
                    conn.commit()
                    conn.close()
                    break

                else:

                    cursor.execute("UPDATE monutil_hosts SET ipAddress = ? WHERE hostname = ?", ipAddress, hostname)
                    conn.close()
                    break

            except pyodbc.Error as ex:

                currentAttempts += 1
                print("SQL Error: {}".format(str(ex)))
                
                if not currentAttempts <= maximumSQLAttempts:
                    raise

                time.sleep(1)


    def insertHostLog(self, hostname, ipAddress, log_time, cpu, memory):
        
        currentAttempts = 1

        self.insertHost(hostname, ipAddress)
        self.deleteOldLogs("monutil_hostlogs", "logTime")
        
        while currentAttempts <= maximumSQLAttempts:

            try:

                conn = pyodbc.connect(self.conn_str)
                cursor = conn.cursor()

                cursor.execute("INSERT INTO monutil_hostlogs (hostname, logTime, cpu, memory) VALUES (?, ?, ?, ?)", hostname, log_time, cpu, memory)
                conn.commit()
                conn.close()
                break

            except pyodbc.Error as ex:
            
                currentAttempts += 1
                print("Error inserting data: {}".format(str(ex)))

                if not currentAttempts <= maximumSQLAttempts:
                    raise

                time.sleep(1)

    def insertURLLog(self, hostname, ipAddress, log_time, url, responseTime):

        currentAttempts = 1

        self.insertHost(hostname, ipAddress)
        self.deleteOldLogs("monutil_urlLogs", "logTime")
        
        while currentAttempts <= maximumSQLAttempts:

            try:

                conn = pyodbc.connect(self.conn_str)
                cursor = conn.cursor()

                cursor.execute("INSERT INTO monutil_urlLogs (hostname, url, logTime, responseTime) VALUES (?, ?, ?, ?)", hostname, url, log_time, responseTime)
                conn.commit()
                conn.close()
                break

            except pyodbc.Error as ex:

                currentAttempts += 1
                print("Error inserting data into monutil_urlLogs:", ex)

                if not currentAttempts <= maximumSQLAttempts:
                    raise

                time.sleep(1)

    def deleteOldLogs(self, tableName, logTimeColumn):
        
        currentAttempts = 1

        while currentAttempts <= maximumSQLAttempts:

            try:

                conn = pyodbc.connect(self.conn_str)
                cursor = conn.cursor()

                if loggingMode == 'mssql':
                    
                    oldestLogQuery = f"SELECT TOP 1 {logTimeColumn} FROM {tableName} ORDER BY {logTimeColumn} ASC"

                elif loggingMode == 'mariadb':

                    oldestLogQuery = f"SELECT {logTimeColumn} FROM {tableName} ORDER BY {logTimeColumn} ASC LIMIT 1"

                cursor.execute(oldestLogQuery)

                if cursor.rowcount > 0:
                    oldestLogTime = cursor.fetchone()[0]

                if cursor.rowcount > 0 and oldestLogTime < datetime.now() - timedelta(days=int(logRetentionDays)):

                    deleteQuery = f"DELETE FROM {tableName} WHERE {logTimeColumn} < ?"
                    cursor.execute(deleteQuery, datetime.now() - timedelta(days=int(logRetentionDays)))
                    conn.commit()
                
                break

            except pyodbc.Error as ex:

                currentAttempts += 1
                print("Error deleting old logs: {}".format(str(ex)))

                if not currentAttempts <= maximumSQLAttempts:
                    raise

                time.sleep(1)