#!/bin/bash

# Disk Health Check Script for Alma Linux 9
# Checks SATA HDD, SATA SSD, SAS, NVMe, RAID controllers, and soft-raid
# Supports consumer and enterprise disk classification

SCRIPT_NAME=$(basename "$0")
VERSION="2.7"

# Color codes
RED=$(tput setaf 1)
GREEN=$(tput setaf 2)
YELLOW=$(tput setaf 3)
BLUE=$(tput setaf 4)
CYAN=$(tput setaf 6)
MAGENTA=$(tput setaf 5)
NC=$(tput sgr0)

# Function to print colored output
print_color() {
    local color=$1
    local message=$2
    echo -e "${color}${message}${NC}"
}

# Check if command exists
command_exists() {
    command -v "$1" >/dev/null 2>&1
}

# Check dependencies
check_dependencies() {
    local missing=()
    
    if ! command_exists smartctl; then
        missing+=("smartmontools")
    fi
    
    if ! command_exists bc; then
        missing+=("bc")
    fi
    
    if [[ ${#missing[@]} -gt 0 ]]; then
        print_color $RED "Error: Missing required packages: ${missing[*]}"
        echo "Install with: sudo dnf install ${missing[*]}"
        exit 1
    fi
}

# TBW endurance standards (using lowest numbers)
declare -A CONSUMER_TBW=(
    ["250"]=150
    ["500"]=300
    ["1000"]=600
    ["2000"]=1200
    ["4000"]=2400
    ["8000"]=4800
)

declare -A ENTERPRISE_TBW=(
    ["250"]=450
    ["500"]=900
    ["1000"]=1800
    ["2000"]=3600
    ["4000"]=7200
    ["8000"]=14400
)

# Function to get closest capacity tier
get_capacity_tier() {
    local capacity_gb=$1
    local tiers=("250" "500" "1000" "2000" "4000" "8000")
    
    for tier in "${tiers[@]}"; do
        if [[ $capacity_gb -le $tier ]]; then
            echo $tier
            return
        fi
    done
    # For larger than 8TB, use proportional scaling from 4TB
    echo "8000"
}

# Function to convert bytes to human readable
bytes_to_human() {
    local bytes=$1
    if [[ $bytes -ge 1099511627776 ]]; then
        echo "$(echo "scale=2; $bytes / 1099511627776" | bc 2>/dev/null || echo "0") TB"
    elif [[ $bytes -ge 1073741824 ]]; then
        echo "$(echo "scale=2; $bytes / 1073741824" | bc 2>/dev/null || echo "0") GB"
    elif [[ $bytes -ge 1048576 ]]; then
        echo "$(echo "scale=2; $bytes / 1048576" | bc 2>/dev/null || echo "0") MB"
    else
        echo "$bytes bytes"
    fi
}

# Function to extract numeric hours from power_on_hours field
extract_numeric_hours() {
    local power_on_hours=$1
    # Remove everything after non-numeric characters
    local numeric_hours=$(echo "$power_on_hours" | sed 's/[^0-9].*$//')
    if [[ -n "$numeric_hours" && "$numeric_hours" =~ ^[0-9]+$ ]]; then
        echo "$numeric_hours"
    else
        echo "0"
    fi
}

# Function to get disk type and interface
get_disk_info() {
    local disk=$1
    
    local info=$(smartctl -i "$disk" 2>/dev/null)
    local transport=""
    local disk_type="UNKNOWN"
    local is_enterprise=false
    
    # Check if it's NVMe
    if [[ "$disk" == /dev/nvme* ]] || echo "$info" | grep -qi "NVMe"; then
        disk_type="NVMe"
        transport="NVMe"
    # Check for SAS
    elif echo "$info" | grep -qi "SAS"; then
        disk_type="SAS"
        transport="SAS"
        is_enterprise=true
    # Check for SATA SSD
    elif echo "$info" | grep -qi "Solid State Device"; then
        disk_type="SSD"
        transport="SATA"
    # Check for SATA HDD
    elif echo "$info" | grep -qi "Rotation Rate"; then
        disk_type="HDD"
        transport="SATA"
    fi
    
    # Check for enterprise features
    if echo "$info" | grep -qi "ENTERPRISE\|EP\|SAS\|Xeon\|Xeons\|DualPort\|PowerLoss\|PLP"; then
        is_enterprise=true
    fi
    
    # Check device type by model name
    local model=$(echo "$info" | grep -i "Device Model:" | cut -d: -f2 | sed 's/^[ \t]*//')
    if echo "$model" | grep -qi "PRO\|EP\|DC\|ENT\|ENTERPRISE\|MX500\|870QVO\|860QVO\|Crucial\|Samsung\|Intel"; then
        if echo "$model" | grep -qi "PRO\|EP\|DC\|ENT\|ENTERPRISE"; then
            is_enterprise=true
        fi
    fi
    
    echo "$disk_type|$transport|$is_enterprise"
}

# Function to calculate TBW for SSD/NVMe
calculate_tbw() {
    local disk_type=$1
    local raw_value=$2
    local sectors=$3
    
    local tbw=0
    
    if [[ -n "$sectors" && "$sectors" != "0" ]]; then
        # Calculate from sectors (most common for SATA SSDs)
        local bytes=$((sectors * 512))
        tbw=$(echo "scale=2; $bytes / 1000 / 1000 / 1000 / 1000" | bc 2>/dev/null || echo "0")
    elif [[ -n "$raw_value" && "$raw_value" != "0" ]]; then
        if [[ "$disk_type" == "NVMe" ]]; then
            # NVMe: raw value is in 32MB units
            tbw=$(echo "scale=2; $raw_value * 32 / 1000 / 1000" | bc 2>/dev/null || echo "0")
        else
            # SATA SSD: various manufacturers
            tbw=$(echo "scale=2; $raw_value * 32 / 1000 / 1000" | bc 2>/dev/null || echo "0")
        fi
    fi
    
    echo "$tbw"
}

# Function to get estimated endurance
get_estimated_endurance() {
    local capacity_gb=$1
    local is_enterprise=$2
    local disk_type=$3
    
    # HDDs don't have TBW
    if [[ "$disk_type" == "HDD" ]]; then
        echo "N/A"
        return
    fi
    
    local capacity_tier=$(get_capacity_tier "$capacity_gb")
    
    if [[ "$is_enterprise" == "true" ]]; then
        echo "${ENTERPRISE_TBW[$capacity_tier]}"
    else
        echo "${CONSUMER_TBW[$capacity_tier]}"
    fi
}

# Function to estimate SSD lifespan with TBW remaining
estimate_ssd_lifespan() {
    local power_on_hours=$1
    local tbw_used=$2
    local estimated_endurance=$3
    local disk_type=$4
    
    if [[ -z "$power_on_hours" || "$power_on_hours" -eq 0 ]]; then
        echo "Unknown||Unknown|New"
        return
    fi
    
    if [[ "$estimated_endurance" == "N/A" ]]; then
        echo "N/A|N/A|N/A|HDD"
        return
    fi
    
    # Handle the case where tbw_used might have formatting issues
    local clean_tbw_used=$(echo "$tbw_used" | sed 's/[^0-9.]//g')
    if [[ -z "$clean_tbw_used" ]]; then
        clean_tbw_used=0
    fi
    
    local tbw_remaining=$(echo "scale=2; $estimated_endurance - $clean_tbw_used" | bc 2>/dev/null || echo "$estimated_endurance")
    
    if [[ $(echo "$clean_tbw_used > 0" | bc 2>/dev/null) -eq 1 ]]; then
        local lifespan_used=$(echo "scale=1; $clean_tbw_used * 100 / $estimated_endurance" | bc 2>/dev/null || echo "0")
        local lifespan_remaining=$(echo "scale=1; 100 - $lifespan_used" | bc 2>/dev/null || echo "100")
        
        if [[ $(echo "$lifespan_used >= 80" | bc 2>/dev/null) -eq 1 ]]; then
            echo "${RED}${lifespan_remaining}%${NC}|${RED}${tbw_remaining} TB${NC}|High wear|$disk_type"
        elif [[ $(echo "$lifespan_used >= 50" | bc 2>/dev/null) -eq 1 ]]; then
            echo "${YELLOW}${lifespan_remaining}%${NC}|${YELLOW}${tbw_remaining} TB${NC}|Moderate wear|$disk_type"
        else
            echo "${GREEN}${lifespan_remaining}%${NC}|${GREEN}${tbw_remaining} TB${NC}|Healthy|$disk_type"
        fi
    else
        echo "Unknown|${estimated_endurance} TB|New|$disk_type"
    fi
}

# Function to estimate HDD lifespan
estimate_hdd_lifespan() {
    local power_on_hours=$1
    local reallocated_sectors=$2
    local pending_sectors=$3
    local start_stop_count=$4
    local load_cycle_count=$5
    local disk_type=$6
    
    # Extract numeric hours only
    local numeric_hours=$(extract_numeric_hours "$power_on_hours")
    
    if [[ -z "$numeric_hours" || "$numeric_hours" -eq 0 ]]; then
        echo "Unknown"
        return
    fi
    
    local severity=0
    
    # Critical issues
    if [[ "$pending_sectors" -gt 0 ]]; then
        echo "${RED}CRITICAL${NC} (Pending sectors: $pending_sectors)"
        return
    elif [[ "$reallocated_sectors" -gt 100 ]]; then
        severity=$((severity + 3))
    elif [[ "$reallocated_sectors" -gt 10 ]]; then
        severity=$((severity + 2))
    elif [[ "$reallocated_sectors" -gt 0 ]]; then
        severity=$((severity + 1))
    fi
    
    # Usage-based assessment
    if [[ "$numeric_hours" -gt 50000 ]]; then
        severity=$((severity + 3))
    elif [[ "$numeric_hours" -gt 30000 ]]; then
        severity=$((severity + 2))
    elif [[ "$numeric_hours" -gt 15000 ]]; then
        severity=$((severity + 1))
    fi
    
    # Mechanical wear (for HDDs)
    if [[ "$disk_type" == "HDD" ]]; then
        if [[ "$start_stop_count" -gt 50000 ]]; then
            severity=$((severity + 2))
        elif [[ "$start_stop_count" -gt 20000 ]]; then
            severity=$((severity + 1))
        fi
        
        if [[ "$load_cycle_count" -gt 500000 ]]; then
            severity=$((severity + 2))
        elif [[ "$load_cycle_count" -gt 200000 ]]; then
            severity=$((severity + 1))
        fi
    fi
    
    if [[ $severity -ge 5 ]]; then
        echo "${RED}< 6 months${NC} (Multiple risk factors)"
    elif [[ $severity -ge 3 ]]; then
        echo "${YELLOW}6-18 months${NC} (Moderate wear)"
    elif [[ $severity -ge 1 ]]; then
        echo "${YELLOW}1-3 years${NC} (Light wear)"
    else
        echo "${GREEN}> 3 years${NC} (Healthy)"
    fi
}

# Function to check soft-raid (MDRAID)
check_mdraid() {
    local md_devices=()
    
    if [[ -f /proc/mdstat ]]; then
        while IFS= read -r line; do
            if [[ $line =~ ^md[0-9]+ ]]; then
                md_devices+=("/dev/${line%% *}")
            fi
        done < /proc/mdstat
    fi
    
    for md in "${md_devices[@]}"; do
        if [[ -b "$md" ]]; then
            print_color $MAGENTA "Found software RAID: $md"
            if command_exists mdadm; then
                local md_info=$(mdadm --detail "$md" 2>/dev/null)
                if [[ -n "$md_info" ]]; then
                    echo "RAID Level: $(echo "$md_info" | grep "Raid Level" | cut -d: -f2 | sed 's/^[ \t]*//')"
                    echo "State: $(echo "$md_info" | grep "State" | head -1 | cut -d: -f2 | sed 's/^[ \t]*//')"
                    echo "Devices: $(echo "$md_info" | grep "Active Devices" | cut -d: -f2 | sed 's/^[ \t]*//')"
                    echo ""
                fi
            fi
        fi
    done
}

# Function to extract capacity in GB from various formats - IMPROVED VERSION
extract_capacity_gb() {
    local capacity=$1
    local capacity_gb=0
    
    # Remove extra spaces and normalize
    capacity=$(echo "$capacity" | sed 's/  */ /g')
    
    # Method 1: Try to extract from User Capacity field with bytes
    if [[ $capacity =~ ([0-9,]+)\s*bytes ]]; then
        local bytes=$(echo "${BASH_REMATCH[1]}" | tr -d ',')
        capacity_gb=$(echo "scale=0; $bytes / 1000 / 1000 / 1000" | bc 2>/dev/null | cut -d. -f1)
    fi
    
    # Method 2: Try to extract from bracket format [XXX GB] or [X.XX TB]
    if [[ $capacity_gb -eq 0 ]] && [[ $capacity =~ \[([0-9,.]+)\s*([GT])B?\] ]]; then
        local size=$(echo "${BASH_REMATCH[1]}" | tr -d ',')
        local unit="${BASH_REMATCH[2]}"
        if [[ "$unit" == "T" ]]; then
            capacity_gb=$(echo "scale=0; $size * 1000" | bc 2>/dev/null | cut -d. -f1)
        else
            capacity_gb=$(echo "scale=0; $size" | bc 2>/dev/null | cut -d. -f1)
        fi
    fi
    
    # Method 3: Try direct TB/GB pattern matching
    if [[ $capacity_gb -eq 0 ]] && [[ $capacity =~ ([0-9,.]+)\s*TB ]]; then
        local size=$(echo "$capacity" | grep -oE '[0-9,.]+' | head -1 | tr -d ',')
        capacity_gb=$(echo "scale=0; $size * 1000" | bc 2>/dev/null | cut -d. -f1)
    elif [[ $capacity_gb -eq 0 ]] && [[ $capacity =~ ([0-9,.]+)\s*GB ]]; then
        local size=$(echo "$capacity" | grep -oE '[0-9,.]+' | head -1 | tr -d ',')
        capacity_gb=$(echo "scale=0; $size" | bc 2>/dev/null | cut -d. -f1)
    fi
    
    # Method 4: For NVMe - try different field formats
    if [[ $capacity_gb -eq 0 ]] && [[ $capacity =~ ([0-9,]+)\s*[Bb] ]]; then
        local bytes=$(echo "${BASH_REMATCH[1]}" | tr -d ',')
        capacity_gb=$(echo "scale=0; $bytes / 1000 / 1000 / 1000" | bc 2>/dev/null | cut -d. -f1)
    fi
    
    # Ensure we have a valid number
    if [[ -z "$capacity_gb" || ! "$capacity_gb" =~ ^[0-9]+$ || "$capacity_gb" -le 0 ]]; then
        echo "0"
    else
        echo "$capacity_gb"
    fi
}

# Function to get NVMe capacity using smartctl
get_nvme_capacity() {
    local disk=$1
    local nvme_info=$(smartctl -i "$disk" 2>/dev/null)
    local capacity=""
    
    # Try to get capacity from different fields
    capacity=$(echo "$nvme_info" | grep -i "Total NVM Capacity" | cut -d: -f2 | sed 's/^[ \t]*//')
    if [[ -z "$capacity" ]]; then
        capacity=$(echo "$nvme_info" | grep -i "Namespace 1 Size/Capacity" | cut -d: -f2 | sed 's/^[ \t]*//')
    fi
    if [[ -z "$capacity" ]]; then
        capacity=$(echo "$nvme_info" | grep -i "User Capacity" | cut -d: -f2 | sed 's/^[ \t]*//' | cut -d'[' -f1)
    fi
    
    echo "$capacity"
}

# Function to get human readable capacity
get_human_capacity() {
    local capacity_gb=$1
    
    if [[ $capacity_gb -ge 1000 ]]; then
        echo "$(echo "scale=2; $capacity_gb / 1000" | bc) TB"
    else
        echo "${capacity_gb} GB"
    fi
}

# Function to get capacity using block device information as fallback
get_block_device_capacity() {
    local disk=$1
    local capacity_gb=0
    
    # Try to get capacity from block device using lsblk or fdisk
    if command_exists lsblk; then
        local block_size=$(lsblk -b "$disk" -o SIZE -n 2>/dev/null | head -1)
        if [[ -n "$block_size" && "$block_size" =~ ^[0-9]+$ ]]; then
            capacity_gb=$(echo "scale=0; $block_size / 1000 / 1000 / 1000" | bc 2>/dev/null | cut -d. -f1)
        fi
    fi
    
    # Alternative method using fdisk
    if [[ $capacity_gb -eq 0 ]] && command_exists fdisk; then
        local fdisk_info=$(fdisk -l "$disk" 2>/dev/null | grep "Disk $disk")
        if [[ $fdisk_info =~ ([0-9,.]+)\s*([GT])iB ]]; then
            local size=$(echo "${BASH_REMATCH[1]}" | tr -d ',')
            local unit="${BASH_REMATCH[2]}"
            if [[ "$unit" == "T" ]]; then
                capacity_gb=$(echo "scale=0; $size * 1000" | bc 2>/dev/null | cut -d. -f1)
            else
                capacity_gb=$(echo "scale=0; $size" | bc 2>/dev/null | cut -d. -f1)
            fi
        fi
    fi
    
    echo "$capacity_gb"
}

# Function to check a single disk
check_disk() {
    local disk=$1
    
    print_color $CYAN "Checking disk: $disk"
    echo "=================================================="
    
    # Check if disk exists and is accessible
    if [[ ! -b "$disk" ]]; then
        print_color $RED "Error: $disk is not a valid block device"
        echo ""
        return
    fi
    
    # Get disk information
    local disk_info=$(get_disk_info "$disk")
    local disk_type=$(echo "$disk_info" | cut -d'|' -f1)
    local transport=$(echo "$disk_info" | cut -d'|' -f2)
    local is_enterprise=$(echo "$disk_info" | cut -d'|' -f3)
    
    # Get basic disk information
    local info=$(smartctl -i "$disk" 2>/dev/null)
    local health=$(smartctl -H "$disk" 2>/dev/null)
    local attributes=$(smartctl -A "$disk" 2>/dev/null)
    
    # Check if smartctl command succeeded
    if [[ $? -ne 0 ]] || [[ -z "$info" ]]; then
        print_color $YELLOW "Cannot read disk information. It may be offline, unsupported, or need root access."
        echo ""
        return
    fi
    
    # Extract disk information
    local model=$(echo "$info" | grep -i "Device Model:" | cut -d: -f2 | sed 's/^[ \t]*//')
    [[ -z "$model" ]] && model=$(echo "$info" | grep -i "Model Number:" | cut -d: -f2 | sed 's/^[ \t]*//')
    
    local serial=$(echo "$info" | grep -i "Serial Number:" | cut -d: -f2 | sed 's/^[ \t]*//')
    local capacity=$(echo "$info" | grep -i "User Capacity:" | cut -d: -f2 | sed 's/^[ \t]*//' | cut -d'[' -f1)
    local firmware=$(echo "$info" | grep -i "Firmware Version:" | cut -d: -f2 | sed 's/^[ \t]*//')
    
    # For NVMe disks, try to get capacity from different fields
    if [[ "$disk_type" == "NVMe" ]]; then
        local nvme_capacity=$(get_nvme_capacity "$disk")
        if [[ -n "$nvme_capacity" ]]; then
            capacity="$nvme_capacity"
        fi
    fi
    
    # Extract capacity in GB and human readable format
    local capacity_gb=$(extract_capacity_gb "$capacity")
    local capacity_human=""
    
    # If capacity extraction failed, try block device method
    if [[ "$capacity_gb" -eq 0 ]]; then
        capacity_gb=$(get_block_device_capacity "$disk")
    fi
    
    # Generate human readable capacity
    if [[ "$capacity_gb" -gt 0 ]]; then
        capacity_human=$(get_human_capacity "$capacity_gb")
    else
        capacity_human="Unknown"
    fi
    
    local health_status=$(echo "$health" | grep "result:" | cut -d: -f2 | sed 's/^[ \t]*//')
    [[ -z "$health_status" ]] && health_status=$(echo "$health" | grep "SMART overall-health" | cut -d: -f2 | sed 's/^[ \t]*//')
    
    # Extract SMART attributes
    local power_on_hours_raw=$(echo "$attributes" | grep "Power_On_Hours" | awk '{print $10}' | head -1)
    local power_on_hours=$(extract_numeric_hours "$power_on_hours_raw")
    local reallocated_sectors=$(echo "$attributes" | grep "Reallocated_Sector_Ct" | awk '{print $10}' | head -1)
    local pending_sectors=$(echo "$attributes" | grep "Current_Pending_Sector" | awk '{print $10}' | head -1)
    local total_written=$(echo "$attributes" | grep -E "Total_LBAs_Written|Host_Writes_32MiB" | awk '{print $10}' | head -1)
    local host_writes_32mib=$(echo "$attributes" | grep "Host_Writes_32MiB" | awk '{print $10}' | head -1)
    local start_stop_count=$(echo "$attributes" | grep "Start_Stop_Count" | awk '{print $10}' | head -1)
    local load_cycle_count=$(echo "$attributes" | grep "Load_Cycle_Count" | awk '{print $10}' | head -1)
    
    # For NVMe disks using smartctl extended attributes
    if [[ "$disk_type" == "NVMe" ]]; then
        local nvme_attributes=$(smartctl -x "$disk" 2>/dev/null)
        # Extract data units written for NVMe
        local data_units_written=$(echo "$nvme_attributes" | grep "Data Units Written" | awk '{print $4}' | tr -d ',')
        if [[ -n "$data_units_written" ]]; then
            # Convert data units to sectors (1 data unit = 1000 sectors for NVMe)
            total_written=$(echo "$data_units_written * 1000" | bc 2>/dev/null)
        else
            # Try alternative field
            data_units_written=$(echo "$nvme_attributes" | grep "Data Units Written" | awk '{print $5}' | tr -d ',')
            if [[ -n "$data_units_written" ]]; then
                total_written=$(echo "$data_units_written * 1000" | bc 2>/dev/null)
            fi
        fi
        # Get power on hours for NVMe
        local nvme_power_hours=$(echo "$nvme_attributes" | grep "Power On Hours" | awk '{print $4}')
        if [[ -n "$nvme_power_hours" ]]; then
            power_on_hours="$nvme_power_hours"
        fi
    fi
    
    # Display basic information
    echo "Model:          ${model:-Unknown}"
    echo "Serial:         ${serial:-Unknown}"
    echo "Type:           $disk_type"
    echo "Interface:      $transport"
    echo "Class:          $($is_enterprise && echo "Enterprise" || echo "Consumer")"
    echo "Capacity:       $capacity_human"
    echo "Firmware:       ${firmware:-Unknown}"
    echo "Health:         ${health_status:-Unknown}"
    echo "Power On Hours: ${power_on_hours:-Unknown}"
    
    # Disk type specific analysis
    if [[ "$disk_type" == "HDD" ]]; then
        echo "Realloc Sectors: ${reallocated_sectors:-0}"
        echo "Pending Sectors: ${pending_sectors:-0}"
        [[ -n "$start_stop_count" ]] && echo "Start/Stop Count: ${start_stop_count:-0}"
        [[ -n "$load_cycle_count" ]] && echo "Load Cycle Count: ${load_cycle_count:-0}"
        
        local lifespan=$(estimate_hdd_lifespan "$power_on_hours_raw" "${reallocated_sectors:-0}" "${pending_sectors:-0}" "${start_stop_count:-0}" "${load_cycle_count:-0}" "$disk_type")
        echo "Lifespan:       $lifespan"
        
    elif [[ "$disk_type" == "SSD" || "$disk_type" == "NVMe" || "$disk_type" == "SAS" ]]; then
        local tbw_used=0
        if [[ -n "$total_written" && "$total_written" != "0" ]]; then
            tbw_used=$(calculate_tbw "$disk_type" "" "$total_written")
        elif [[ -n "$host_writes_32mib" && "$host_writes_32mib" != "0" ]]; then
            tbw_used=$(calculate_tbw "$disk_type" "$host_writes_32mib" "")
        fi
        
        local estimated_endurance=$(get_estimated_endurance "$capacity_gb" "$is_enterprise" "$disk_type")
        
        echo "TBW Used:       ${tbw_used} TB"
        echo "TBW Endurance:  ${estimated_endurance} TB (Minimum guaranteed - actual may be higher)"
        
        local lifespan_info=$(estimate_ssd_lifespan "$power_on_hours" "$tbw_used" "$estimated_endurance" "$disk_type")
        local lifespan_percent=$(echo "$lifespan_info" | cut -d'|' -f1)
        local tbw_remaining=$(echo "$lifespan_info" | cut -d'|' -f2)
        local wear_status=$(echo "$lifespan_info" | cut -d'|' -f3)
        
        if [[ "$estimated_endurance" != "N/A" ]]; then
            echo "TBW Remaining:  $tbw_remaining"
            echo "Lifespan:       $lifespan_percent ($wear_status)"
        fi
        
        # Show mechanical attributes for SAS drives that might be SSDs
        if [[ "$disk_type" == "SAS" ]]; then
            echo "Realloc Sectors: ${reallocated_sectors:-0}"
            echo "Pending Sectors: ${pending_sectors:-0}"
        fi
    else
        print_color $YELLOW "Unknown disk type - limited information available"
    fi
    
    echo ""
}

# Function to detect all disks
detect_disks() {
    local disks=()
    
    # Check for SATA/SAS disks
    for disk in /dev/sd[a-z] /dev/sd[a-z][a-z]; do
        if [[ -b "$disk" ]]; then
            disks+=("$disk")
        fi
    done
    
    # Check for NVMe disks (base devices only, no partitions)
    for disk in /dev/nvme[0-9]n[0-9]; do
        if [[ -b "$disk" ]]; then
            disks+=("$disk")
        fi
    done
    
    # Check for other disk types
    for disk in /dev/vd[a-z] /dev/xvd[a-z]; do
        if [[ -b "$disk" ]]; then
            disks+=("$disk")
        fi
    done
    
    echo "${disks[@]}"
}

# Main function
main() {
    print_color $BLUE "Disk Health Check Script v$VERSION for Alma Linux 9"
    print_color $BLUE "Created by Adam T. Lau"    
    print_color $BLUE "===================================================="
    echo ""
    
    check_dependencies
    
    local disks=()
    
    # Check for soft-raid first
    check_mdraid
    
    # If specific disk provided, check only that disk
    if [[ $# -gt 0 ]]; then
        for disk in "$@"; do
            if [[ -b "$disk" ]]; then
                disks+=("$disk")
            else
                print_color $RED "Error: $disk is not a valid block device"
            fi
        done
    else
        # Auto-detect disks
        print_color $CYAN "Auto-detecting disks..."
        read -ra disks <<< "$(detect_disks)"
    fi
    
    if [[ ${#disks[@]} -eq 0 ]]; then
        print_color $RED "No disks found or accessible"
        echo "Try running as root or specifying disk paths manually"
        exit 1
    fi
    
    print_color $GREEN "Found ${#disks[@]} disk(s) to check"
    echo ""
    
    # Check if running as root, warn if not
    if [[ $EUID -ne 0 ]]; then
        print_color $YELLOW "Warning: Not running as root. Some disks may not be accessible."
        echo "For complete results, run as: sudo $0"
        echo ""
    fi
    
    # Check each disk
    for disk in "${disks[@]}"; do
        check_disk "$disk"
    done
    
    print_color $BLUE "Check completed!"
    echo ""
    print_color $YELLOW "Note: TBW Endurance values shown are minimum guaranteed numbers."
    print_color $YELLOW "      Actual endurance for your specific drive model may be higher."
}

# Usage information
usage() {
    echo "Usage: $SCRIPT_NAME [DISK1 DISK2 ...]"
    echo ""
    echo "If no disks specified, auto-detects all available disks"
    echo ""
    echo "Examples:"
    echo "  $SCRIPT_NAME                    # Check all auto-detected disks"
    echo "  sudo $SCRIPT_NAME               # Check all disks (as root)"
    echo "  $SCRIPT_NAME /dev/sda           # Check specific disk"
    echo "  $SCRIPT_NAME /dev/nvme0n1       # Check specific NVMe disk"
    echo "  $SCRIPT_NAME /dev/sda /dev/nvme0n1  # Check multiple disks"
    echo ""
    echo "Supported: SATA HDD/SSD, SAS HDD/SSD, NVMe, Hardware RAID, Software RAID"
}

# Parse command line arguments
case "${1:-}" in
    -h|--help)
        usage
        exit 0
        ;;
    -v|--version)
        echo "$SCRIPT_NAME version $VERSION"
        exit 0
        ;;
    *)
        main "$@"
        ;;
esac