#!/usr/bin/env bash
set -euo pipefail

# === METADATA ===
SCRIPT_NAME="$(basename "$0")"
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
SKILL_ROOT="$(dirname "$SCRIPT_DIR")"

# === CONFIGURATION ===
: "${OPERATOR_NAME:?OPERATOR_NAME required}"
: "${OPERATOR_EMAIL:?OPERATOR_EMAIL required}"
: "${NODE_NAME:=node-a}"
: "${SSH_KEY_COMMENT:=$NODE_NAME-operator}"
: "${GPG_KEY_SIZE:=4096}"
: "${GPG_KEY_EXPIRE:=2y}"
: "${OUTPUT_DIR:=$SKILL_ROOT/outputs}"

# === FUNCTIONS ===
log_info()  { echo "[INFO]  $(date -Iseconds) $*"; }
log_warn()  { echo "[WARN]  $(date -Iseconds) $*" >&2; }

main() {
    log_info "Starting $SCRIPT_NAME (PLAN ONLY - no changes made)..."

    echo ""
    echo "============================================"
    echo "  IDENTITY SETUP PLAN"
    echo "  Node: $NODE_NAME"
    echo "============================================"
    echo ""

    echo "=== GPG Key Configuration ==="
    echo "  Name:       $OPERATOR_NAME"
    echo "  Email:      $OPERATOR_EMAIL"
    echo "  Key Size:   $GPG_KEY_SIZE bits (RSA)"
    echo "  Expiry:     $GPG_KEY_EXPIRE"
    echo "  Location:   ~/.gnupg/"
    echo ""

    echo "=== SSH Key Configuration ==="
    echo "  Primary:    Ed25519 (~/.ssh/id_ed25519_${NODE_NAME})"
    echo "  Fallback:   RSA-4096 (~/.ssh/id_rsa_${NODE_NAME})"
    echo "  Comment:    $SSH_KEY_COMMENT"
    echo ""

    echo "=== SSH Config Changes ==="
    echo "  File:       ~/.ssh/config"
    echo "  Backup:     ~/.ssh/config.bak.$(date +%Y%m%d)"
    echo "  Addition:   Host alias for $NODE_NAME"
    echo ""

    # Check for existing keys
    if [[ -f "$HOME/.ssh/id_ed25519_${NODE_NAME}" ]]; then
        log_warn "SSH key already exists at ~/.ssh/id_ed25519_${NODE_NAME}"
        log_warn "Apply will skip SSH key creation (idempotent)"
    fi

    if gpg --list-keys "$OPERATOR_EMAIL" &>/dev/null 2>&1; then
        log_warn "GPG key for $OPERATOR_EMAIL already exists"
        log_warn "Apply will skip GPG key creation (idempotent)"
    fi

    echo "============================================"
    echo "  To apply: ./scripts/02_identity_apply.sh"
    echo "  To abort: Do nothing"
    echo "  To rollback: ./scripts/rollback/undo_identity.sh"
    echo "============================================"

    log_info "Completed $SCRIPT_NAME"
}

[[ "${BASH_SOURCE[0]}" == "$0" ]] && main "$@"