#!/usr/bin/env bash
# install.sh — Symlink the Greyhaven Design System SKILL.md into a consuming project's
# .claude/skills/ directory so that any Claude Code session gets full design system context.
#
# Usage:
#   From the greyhaven-design-system repo:
#     ./skill/install.sh /path/to/your/project
#
#   Or from any directory:
#     /path/to/greyhaven-design-system/skill/install.sh /path/to/your/project

set -euo pipefail

# Resolve the absolute path of the SKILL.md file relative to this script
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
SKILL_FILE="${SCRIPT_DIR}/SKILL.md"

# Validate SKILL.md exists
if [ ! -f "$SKILL_FILE" ]; then
  echo "Error: SKILL.md not found at ${SKILL_FILE}"
  exit 1
fi

# Get target project directory from argument or prompt
if [ $# -ge 1 ]; then
  TARGET_PROJECT="$1"
else
  echo "Usage: $0 <target-project-directory>"
  echo ""
  echo "Example:"
  echo "  $0 /path/to/my-app"
  echo "  $0 ."
  exit 1
fi

# Resolve to absolute path
TARGET_PROJECT="$(cd "$TARGET_PROJECT" && pwd)"

# Validate target directory exists
if [ ! -d "$TARGET_PROJECT" ]; then
  echo "Error: Directory not found: ${TARGET_PROJECT}"
  exit 1
fi

# Create .claude/skills/ directory in target project if it doesn't exist
SKILLS_DIR="${TARGET_PROJECT}/.claude/skills"
mkdir -p "$SKILLS_DIR"

# Create the symlink
LINK_PATH="${SKILLS_DIR}/greyhaven-design-system.md"

if [ -L "$LINK_PATH" ]; then
  echo "Updating existing symlink at ${LINK_PATH}"
  rm "$LINK_PATH"
elif [ -f "$LINK_PATH" ]; then
  echo "Warning: ${LINK_PATH} exists as a regular file. Backing up to ${LINK_PATH}.bak"
  mv "$LINK_PATH" "${LINK_PATH}.bak"
fi

ln -s "$SKILL_FILE" "$LINK_PATH"

echo "Done! Greyhaven Design System skill installed."
echo ""
echo "  Symlink: ${LINK_PATH}"
echo "  Target:  ${SKILL_FILE}"
echo ""
echo "Any Claude Code session in ${TARGET_PROJECT} will now have"
echo "full Greyhaven Design System context available."