#!/bin/bash
# tin machine list - List existing machine environments

set -euo pipefail

# Get tinsnip root and source libraries
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
TINSNIP_ROOT="$(dirname "$(dirname "$SCRIPT_DIR")")"
source "$TINSNIP_ROOT/lib/core.sh"
source "$TINSNIP_ROOT/lib/uid.sh"

# List existing machine environments
list_machines() {
    echo "Machine Environments"
    echo "==================="
    echo
    
    # Scan for service users in the system
    echo "Service                  Environment  UID    Status"
    echo "-------                  -----------  ---    ------"
    
    local found_any=false
    local sheet=$(get_sheet)
    local sheet_num=$(get_sheet_number "$sheet" 2>/dev/null || echo "")
    
    if [[ -z "$sheet_num" ]]; then
        echo "Sheet '$sheet' not registered - cannot scan for machines"
        return 1
    fi
    
    # Scan for users matching SMEP pattern for this sheet
    for service_num in {00..99}; do
        for env_num in {0..9}; do
            for port_num in 0; do  # Only check base UID (port 0)
                local smep_uid="${sheet_num}${service_num}${env_num}${port_num}"

                if getent passwd "$smep_uid" >/dev/null 2>&1; then
                    local username=$(getent passwd "$smep_uid" | cut -d: -f1)

                    # Parse service and environment from username
                    local parsed_output
                    if parsed_output=$(parse_machine_name "$username" 2>/dev/null); then
                        local service_name=$(echo "$parsed_output" | sed -n '1p')
                        local env_name=$(echo "$parsed_output" | sed -n '2p')
                        local status="Active"

                        # Check if mount exists
                        if mountpoint -q "/mnt/$username" 2>/dev/null; then
                            status="Mounted"
                        fi

                        printf "%-24s %-12s %-6s %s\n" "$service_name" "$env_name" "$smep_uid" "$status"
                        found_any=true
                    fi
                fi
            done
        done
    done
    
    if [[ "$found_any" == "false" ]]; then
        echo "No machine environments found in sheet '$sheet'"
        echo ""
        echo "Create one with: tin machine create <service> <environment>"
    fi
}

# Main execution
list_machines