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

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
KLAUS_PATH="${SCRIPT_DIR}/klaus.sh"
SETTINGS_FILE="${HOME}/.claude/settings.json"

if ! command -v jq &>/dev/null; then
  echo "error: jq is required. install it first."
  exit 1
fi

chmod +x "$KLAUS_PATH"

mkdir -p "$(dirname "$SETTINGS_FILE")"

if [[ -f "$SETTINGS_FILE" ]]; then
  # warn if status line already configured
  EXISTING=$(jq -r '.statusLine.command // empty' "$SETTINGS_FILE")
  if [[ -n "$EXISTING" && "$EXISTING" != "$KLAUS_PATH" ]]; then
    echo "warning: statusLine already set to: $EXISTING"
    printf "overwrite? [y/N] "
    read -r REPLY
    if [[ ! "$REPLY" =~ ^[Yy]$ ]]; then
      echo "aborted"
      exit 0
    fi
  fi

  # backup
  cp "$SETTINGS_FILE" "${SETTINGS_FILE}.bak"

  UPDATED=$(jq --arg cmd "$KLAUS_PATH" '.statusLine = {"type": "command", "command": $cmd}' "$SETTINGS_FILE")
else
  UPDATED=$(jq -n --arg cmd "$KLAUS_PATH" '{"statusLine": {"type": "command", "command": $cmd}}')
fi

# validate jq output before writing
if ! echo "$UPDATED" | jq empty 2>/dev/null; then
  echo "error: failed to produce valid json"
  exit 1
fi

# atomic write via temp file
TMP=$(mktemp "${SETTINGS_FILE}.XXXXXX")
echo "$UPDATED" >"$TMP"
mv "$TMP" "$SETTINGS_FILE"

echo "installed klaus → ${KLAUS_PATH}"
[[ -f "${SETTINGS_FILE}.bak" ]] && echo "backup saved → ${SETTINGS_FILE}.bak"
echo "restart claude code to activate"