install.sh

#!/bin/bash
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
CLAUDE_DIR="$HOME/.claude"
BACKUP_DIR="$CLAUDE_DIR/backup-$(date +%Y%m%d-%H%M%S)"

# --- Prompt for user-specific values ---
if [ -z "${PROJECTS_DIR:-}" ]; then
  printf "Default projects directory [%s/Projects]: " "$HOME"
  read -r PROJECTS_DIR
  PROJECTS_DIR="${PROJECTS_DIR:-$HOME/Projects}"
fi
# Expand ~ if present
PROJECTS_DIR="${PROJECTS_DIR/#\~/$HOME}"

# source:destination pairs (symlinked)
SYMLINK_MAPPINGS="
settings.json:$CLAUDE_DIR/settings.json
settings.local.json:$CLAUDE_DIR/settings.local.json
statusline-command.sh:$CLAUDE_DIR/statusline-command.sh
mcp.json:$CLAUDE_DIR/plugins/custom/.mcp.json
"

echo "Installing Claude Code configuration..."
echo "Source: $SCRIPT_DIR"
echo "Target: $CLAUDE_DIR"
echo "Projects dir: $PROJECTS_DIR"
echo ""

mkdir -p "$CLAUDE_DIR"
mkdir -p "$CLAUDE_DIR/plugins/custom"

backed_up=false

backup_if_needed() {
  local dest="$1"
  local name="$2"
  # Skip symlinks and files we previously generated
  if [ -e "$dest" ] && [ ! -L "$dest" ] && ! head -1 "$dest" 2>/dev/null | grep -q "^<!-- generated by install.sh -->$"; then
    if [ "$backed_up" = false ]; then
      mkdir -p "$BACKUP_DIR"
      backed_up=true
      echo "Backing up existing files to $BACKUP_DIR"
    fi
    cp "$dest" "$BACKUP_DIR/$name"
    echo "  Backed up: $name"
  fi
}

# Symlink static files
for mapping in $SYMLINK_MAPPINGS; do
  src="${mapping%%:*}"
  dest="${mapping#*:}"
  source_path="$SCRIPT_DIR/$src"

  if [ ! -f "$source_path" ]; then
    echo "SKIP: $src (not found)"
    continue
  fi

  backup_if_needed "$dest" "$src"

  rm -f "$dest"
  ln -s "$source_path" "$dest"
  echo "  Linked: $src -> $dest"
done

# Copy CLAUDE.md with placeholder substitution
if [ -f "$SCRIPT_DIR/CLAUDE.md" ]; then
  backup_if_needed "$CLAUDE_DIR/CLAUDE.md" "CLAUDE.md"
  rm -f "$CLAUDE_DIR/CLAUDE.md"
  { echo "<!-- generated by install.sh -->"; while IFS= read -r line; do printf '%s\n' "${line//\{\{PROJECTS_DIR\}\}/$PROJECTS_DIR}"; done < "$SCRIPT_DIR/CLAUDE.md"; } > "$CLAUDE_DIR/CLAUDE.md"
  echo "  Generated: CLAUDE.md (projects dir: $PROJECTS_DIR)"
fi

chmod +x "$SCRIPT_DIR/statusline-command.sh"

# --- Install gstack skills ---
SKILLS_DIR="$CLAUDE_DIR/skills"
GSTACK_DIR="$SKILLS_DIR/gstack"
GSTACK_REPO="https://github.com/garrytan/gstack.git"

mkdir -p "$SKILLS_DIR"

if [ -d "$GSTACK_DIR/.git" ]; then
  echo "Updating gstack skills..."
  git -C "$GSTACK_DIR" pull --ff-only origin main 2>/dev/null || echo "  Warning: gstack update failed (offline or conflict), keeping current version"
else
  echo "Installing gstack skills..."
  git clone "$GSTACK_REPO" "$GSTACK_DIR"
fi

# Symlink each gstack skill directory that contains a SKILL.md
for skill_dir in "$GSTACK_DIR"/*/; do
  skill_name="$(basename "$skill_dir")"
  if [ -f "$skill_dir/SKILL.md" ]; then
    ln -sfn "gstack/$skill_name" "$SKILLS_DIR/$skill_name"
    echo "  Linked skill: $skill_name"
  fi
done

echo ""
echo "Done. Restart Claude Code to pick up changes."
if [ "$backed_up" = true ]; then
  echo "Backups saved to: $BACKUP_DIR"
fi