# SSH Command Handler
# Domain: Advanced SSH operations with pooling and circuit breaker

use ./shared.nu *

def ssh-pool-connect [host: string user: string --check = false] { {host: $host, port: 22} }
def ssh-pool-status [] { {connections: 0, capacity: 10} }
def ssh-deployment-strategies [] { ["serial" "parallel" "batched"] }
def ssh-retry-config [strategy: string max_retries: int] { {strategy: $strategy, max_retries: $max_retries} }
def ssh-circuit-breaker-status [] { {state: "closed", failures: 0} }

export def cmd-ssh [
    action: string
    args: list = []
    --check = false
] {
    if ($action == null) { help-ssh; return }

    match $action {
        "pool" => {
            let subaction = ($args | get 0?)
            match $subaction {
                "connect" => {
                    let host = ($args | get 1?)
                    let user = ($args | get 2? | default "root")
                    if ($host == null) {
                        print "Usage: provisioning ssh pool connect <host> [user]"
                        exit 1
                    }
                    let pool = (ssh-pool-connect $host $user --check=$check)
                    print $"Connected to: [$pool.host]:[$pool.port]"
                }
                "exec" => { print "SSH pool execute: implementation pending" }
                "status" => {
                    let status = (ssh-pool-status)
                    print $"Pool status: [$status.connections] connections"
                }
                _ => { help-ssh-pool }
            }
        }
        "strategies" => {
            let strategies = (ssh-deployment-strategies)
            print "Deployment strategies:"
            $strategies | each {|s| print $"  • $s"}
        }
        "retry-config" => {
            let strategy = ($args | get 0? | default "exponential")
            let max_retries = ($args | get 1? | default 3)
            let config = (ssh-retry-config $strategy $max_retries)
            print $"Retry config: [$config.strategy] with max [$config.max_retries] retries"
        }
        "circuit-breaker" => {
            let status = (ssh-circuit-breaker-status)
            print $"Circuit breaker state: [$status.state]"
            print $"Failures: [$status.failures]"
        }
        "help" | "--help" => { help-ssh }
        _ => { print $"Unknown ssh command: [$action]"; help-ssh; exit 1 }
    }
}

def help-ssh [] {
    print "SSH advanced - Distributed operations with pooling and circuit breaker"
    print ""
    print "Usage: provisioning ssh <action> [args]"
    print ""
    print "Actions:"
    print "  pool connect <host> [user]   Create SSH pool connection"
    print "  pool exec <hosts> <cmd>      Execute on SSH pool"
    print "  pool status                  Check pool status"
    print "  strategies                   List deployment strategies"
    print "  retry-config [strategy]      Configure retry strategy"
    print "  circuit-breaker              Check circuit breaker status"
}

def help-ssh-pool [] {
    print "SSH pool operations"
    print ""
    print "Usage: provisioning ssh pool <action> [args]"
    print ""
    print "Actions:"
    print "  connect <host> [user]   Create connection"
    print "  exec <hosts> <cmd>      Execute command"
    print "  status                  Check status"
}
