#!/bin/bash

#-----------------------------------#
#             VARIABLES             #
#-----------------------------------#

this_script_url="https://git.hhf.technology/hhf/script-management-cloudpanel/raw/branch/main/monitoring/monitoring.sh"
this_script_name="System Monitoring Script"
formatter_url="https://git.hhf.technology/hhf/TaskFormatter/raw/branch/main/bash_task_formatter/task_formatter.sh"
scriptname=$0

# Initialize success flag
success=0

# Determine the user (use the first argument if provided, otherwise fallback)
USER_TO_RUN_AS="${1:-$SUDO_USER}"
USER_HOME=$(eval echo ~$USER_TO_RUN_AS)

#-----------------------------------#
#             FORMATTER             #
#-----------------------------------#

# Download and source the formatter with error handling
download_formatter() {
    if [ ! -f "task_formatter.sh" ]; then
        if ! wget "$formatter_url" --no-check-certificate -O task_formatter.sh > /dev/null 2>&1; then
            echo "Error: Failed to download task_formatter.sh"
            exit 1
        fi
    fi

    if [ ! -f "task_formatter.sh" ]; then
        echo "Error: task_formatter.sh not found after download attempt"
        exit 1
    fi

    # Make the formatter executable
    chmod +x task_formatter.sh

    # Source the formatter with error checking
    source ./task_formatter.sh || { echo "Error: Failed to source task_formatter.sh"; exit 1; }
    
    # Check if print_header is available after sourcing
    if ! declare -f print_header > /dev/null; then
        echo "Error: print_header function not found after sourcing."
        exit 1
    fi
}

# Call the download_formatter function
download_formatter

#-----------------------------------#
#             FUNCTIONS             #
#-----------------------------------#

# Function to install required packages
install_dependencies() {
    if ! dpkg -l | grep -q sysstat || ! dpkg -l | grep -q ifstat; then
        sudo apt-get update > /dev/null 2>&1
        sudo apt-get install -y sysstat ifstat > /dev/null 2>&1
        if [ $? -eq 0 ]; then
            echo -e "Dependencies installed $CHECK_MARK"
            return 0
        else
            echo -e "Failed to install dependencies $CROSS_MARK"
            return 1
        fi
    else
        echo -e "Dependencies already installed $CHECK_MARK"
        return 0
    fi
}

# Function to check CPU usage
check_cpu_usage() {
    mpstat 1 1 | awk '/all/ {print "CPU Load: " $3 "% idle"}' > /tmp/cpu_stats
    if [ -s /tmp/cpu_stats ]; then
        cat /tmp/cpu_stats
        rm /tmp/cpu_stats
        echo -e "CPU check completed $CHECK_MARK"
        return 0
    else
        echo -e "CPU check failed $CROSS_MARK"
        return 1
    fi
}

# Function to check memory usage
check_memory_usage() {
    echo "Memory Statistics:"
    free -h | awk '/Mem/ {print "Total Memory: " $2 "\nUsed: " $3 "\nFree: " $4}'
    echo "Swap Statistics:"
    free -h | awk '/Swap/ {print "Total: " $2 ", Used: " $3 ", Free: " $4}'
    echo -e "Memory check completed $CHECK_MARK"
    return 0
}

# Function to check disk usage
check_disk_usage() {
    df -h | grep '^/dev' | awk '{print $1 ": " $5 " used, " $4 " available"}'
    echo -e "Disk check completed $CHECK_MARK"
    return 0
}

# Function to check network traffic
check_network_traffic() {
    if ifstat -i eth0 1 1 > /tmp/network_stats 2>/dev/null; then
        awk 'NR==3 {print "RX: " $1 " KB/s, TX: " $2 " KB/s"}' /tmp/network_stats
        rm /tmp/network_stats
        echo -e "Network check completed $CHECK_MARK"
        return 0
    else
        echo -e "Network check failed $CROSS_MARK"
        return 1
    fi
}

# Function to check top processes
check_top_processes() {
    echo "Top 5 Memory Consuming Processes:"
    ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem | head -n 6
    
    echo -e "\nTop 5 CPU Consuming Processes:"
    ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%cpu | head -n 6
    echo -e "Process check completed $CHECK_MARK"
    return 0
}

# Function to check system logs
check_system_logs() {
    if journalctl -p 3 -xb --no-pager | tail -n 10 > /tmp/system_logs 2>/dev/null; then
        cat /tmp/system_logs
        rm /tmp/system_logs
        echo -e "Log check completed $CHECK_MARK"
        return 0
    else
        echo -e "Log check failed $CROSS_MARK"
        return 1
    fi
}

# Remove created files on cleanup
cleanup_files() {
    rm -f /tmp/cpu_stats /tmp/network_stats /tmp/system_logs
    echo -e "Cleaned up temporary files $CHECK_MARK"
    return 0
}

# Remove the script itself
remove_script() {
    if [ -f "$0" ]; then
        echo "Deleted monitoring script..."
        rm -- "$0"
    fi
    if [ -f "task_formatter.sh" ]; then
        rm task_formatter.sh
    fi
    echo -e "Cleaned up $CHECK_MARK"
    return 0
}

#-----------------------------------#
#             MAIN LOGIC            #
#-----------------------------------#

# Check if print_header function exists
if ! command -v print_header >/dev/null 2>&1; then
    echo "Error: print_header function not found. Formatter may not be properly sourced."
    exit 1
fi

# Print header
print_header "$this_script_name" "$this_script_url"

echo -e "Running as User: $USER_TO_RUN_AS\nUser Home: $USER_HOME\n"

# Run the monitoring functions with formatted output
if ! format_output install_dependencies "Installing Dependencies"; then
    cleanup_files
    success=1
fi

if ! format_output check_cpu_usage "Checking CPU Usage"; then
    cleanup_files
    success=1
fi

if ! format_output check_memory_usage "Checking Memory Usage"; then
    cleanup_files
    success=1
fi

if ! format_output check_disk_usage "Checking Disk Usage"; then
    cleanup_files
    success=1
fi

if ! format_output check_network_traffic "Checking Network Traffic"; then
    cleanup_files
    success=1
fi

if ! format_output check_top_processes "Checking Top Processes"; then
    cleanup_files
    success=1
fi

if ! format_output check_system_logs "Checking System Logs"; then
    cleanup_files
    success=1
fi

format_output cleanup_files "Cleaning up temporary files"
format_output remove_script "Removing script"

# Check if final_message function exists
if ! command -v final_message >/dev/null 2>&1; then
    echo "Error: final_message function not found. Formatter may not be properly sourced."
    exit 1
fi

# Print final message
final_message() {
    local script_name=$1
    local success=$2
    if [[ $success -eq 0 ]]; then
        log "${CHECK_MARK} $script_name completed successfully."
    else
        log "${CROSS_MARK} $script_name encountered errors."
    fi
}

# Exit with appropriate status
exit $success