#!/bin/bash
# =============================================================================
# generate-device-id.sh — Generate anonymous device nickname for git commits
#
# Creates a persistent device identity like "phantom-fox-a3b2" that:
# - Hides real username, hostname, and IP
# - Stays the same across sessions on the same machine
# - Is unique per device (based on hardware ID hash)
# =============================================================================

set -euo pipefail

CONFIG_DIR="${XDG_CONFIG_HOME:-$HOME/.config}/entire"
DEVICE_ID_FILE="$CONFIG_DIR/device-id"

# If already generated, just output it
if [ -f "$DEVICE_ID_FILE" ]; then
  cat "$DEVICE_ID_FILE"
  exit 0
fi

# --- Generate hardware fingerprint ---
get_machine_id() {
  # Try multiple sources for a stable machine ID
  if [ -f "/etc/machine-id" ]; then
    cat /etc/machine-id
  elif [ -f "/var/lib/dbus/machine-id" ]; then
    cat /var/lib/dbus/machine-id
  elif command -v ioreg &>/dev/null; then
    # macOS: IOPlatformSerialNumber
    ioreg -rd1 -c IOPlatformExpertDevice 2>/dev/null | grep -o '"IOPlatformSerialNumber" = "[^"]*"' | sed 's/.*= "//;s/"//'
  elif command -v wmic &>/dev/null; then
    # Windows
    wmic csproduct get uuid 2>/dev/null | tail -1 | tr -d ' \r\n'
  else
    # Fallback: hostname + username hash
    echo "$(hostname)$(whoami)$(date +%s)"
  fi
}

# --- Word lists for readable nicknames ---
ADJECTIVES=(
  phantom silent cosmic rapid swift
  frozen arctic lunar solar neon
  hidden shadow cipher binary quantum
  iron steel chrome cobalt silver
  alpha delta omega sigma theta
  rogue ghost echo pulse drift
)

NOUNS=(
  fox wolf hawk bear lynx
  node core byte mesh grid
  spark flame pulse wave beam
  tower vault forge nexus axis
  rover scout pilot agent proxy
  cloud storm frost ember flare
)

# --- Deterministic selection from hardware ID ---
MACHINE_ID=$(get_machine_id)
if command -v sha256sum &>/dev/null; then
  HASH=$(echo -n "$MACHINE_ID" | sha256sum | cut -c1-8)
elif command -v shasum &>/dev/null; then
  HASH=$(echo -n "$MACHINE_ID" | shasum -a 256 | cut -c1-8)
else
  HASH=$(echo -n "$MACHINE_ID" | md5sum 2>/dev/null | cut -c1-8 || echo "00000000")
fi

# Convert first 4 hex chars to indices
ADJ_IDX=$(( 16#${HASH:0:2} % ${#ADJECTIVES[@]} ))
NOUN_IDX=$(( 16#${HASH:2:2} % ${#NOUNS[@]} ))
SUFFIX="${HASH:4:4}"

DEVICE_NAME="${ADJECTIVES[$ADJ_IDX]}-${NOUNS[$NOUN_IDX]}-${SUFFIX}"

# --- Persist ---
mkdir -p "$CONFIG_DIR"
echo "$DEVICE_NAME" > "$DEVICE_ID_FILE"

echo "$DEVICE_NAME"