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

DEFAULT_REPO_URL="https://git.ikuban.com/server/htsy-skill.git"
REPO_URL="${HTSY_SKILL_REPO_URL:-$DEFAULT_REPO_URL}"
SOURCE_DIR=""
DEST_DIR="${HTSY_SKILL_DEST:-}"
SKILLS_DIR="${AGENT_SKILLS_DIR:-}"
AGENT="${HTSY_SKILL_AGENT:-}"
TMP_DIR=""
TMP_DEST=""

usage() {
  cat <<'USAGE'
Install the htsy agent skill.

Usage:
  scripts/install-htsy-skill.sh --agent claude|claude-project|codex [--source PATH]
  scripts/install-htsy-skill.sh --dest PATH [--source PATH]
  scripts/install-htsy-skill.sh --skills-dir PATH [--source PATH]

Options:
  --source PATH  Path to the htsy skill directory. Defaults to ./htsy when run from this repository.
  --agent NAME   Install target: claude, claude-project, or codex.
  --dest PATH    Exact destination skill directory, for example /path/to/skills/htsy.
  --skills-dir PATH
                 Parent skills directory. The installer writes PATH/htsy.
  --repo URL     Repository URL used when ./htsy is not available.
  -h, --help     Show this help.

Environment:
  AGENT_SKILLS_DIR      Parent skills directory. The installer writes AGENT_SKILLS_DIR/htsy.
  CODEX_HOME            Codex home directory when --agent codex is used.
  CLAUDE_HOME           Claude home directory when --agent claude is used.
  HTSY_SKILL_AGENT      Default value for --agent.
  HTSY_SKILL_REPO_URL   Repository URL fallback.
  HTSY_SKILL_DEST       Destination skill directory.
USAGE
}

while [ "$#" -gt 0 ]; do
  case "$1" in
    --source)
      SOURCE_DIR="${2:-}"
      shift 2
      ;;
    --dest)
      DEST_DIR="${2:-}"
      shift 2
      ;;
    --skills-dir)
      SKILLS_DIR="${2:-}"
      shift 2
      ;;
    --agent)
      AGENT="${2:-}"
      shift 2
      ;;
    --repo)
      REPO_URL="${2:-}"
      shift 2
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    *)
      echo "Unknown option: $1" >&2
      usage >&2
      exit 2
      ;;
  esac
done

if [ -z "$DEST_DIR" ]; then
  if [ -n "$SKILLS_DIR" ]; then
    DEST_DIR="$SKILLS_DIR/htsy"
  else
    case "$AGENT" in
      claude|claude-user)
        DEST_DIR="${CLAUDE_HOME:-$HOME/.claude}/skills/htsy"
        ;;
      claude-project)
        DEST_DIR="$PWD/.claude/skills/htsy"
        ;;
      codex)
        DEST_DIR="${CODEX_HOME:-$HOME/.codex}/skills/htsy"
        ;;
      "")
        echo "Specify --agent claude|claude-project|codex, --skills-dir, or --dest." >&2
        usage >&2
        exit 2
        ;;
      *)
        echo "Unknown agent: $AGENT" >&2
        usage >&2
        exit 2
        ;;
    esac
  fi
fi

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"

cleanup() {
  if [ -n "$TMP_DEST" ]; then
    rm -rf "$TMP_DEST"
  fi
  if [ -n "$TMP_DIR" ]; then
    rm -rf "$TMP_DIR"
  fi
}
trap cleanup EXIT

if [ -z "$SOURCE_DIR" ]; then
  if [ -f "$REPO_ROOT/htsy/SKILL.md" ]; then
    SOURCE_DIR="$REPO_ROOT/htsy"
  else
    if ! command -v git >/dev/null 2>&1; then
      echo "git is required when the local htsy/ directory is unavailable." >&2
      exit 1
    fi

    TMP_DIR="$(mktemp -d)"
    git clone --depth 1 "$REPO_URL" "$TMP_DIR/htsy-skill"
    SOURCE_DIR="$TMP_DIR/htsy-skill/htsy"
  fi
fi

if [ ! -f "$SOURCE_DIR/SKILL.md" ]; then
  echo "Invalid source: $SOURCE_DIR does not contain SKILL.md" >&2
  exit 1
fi

DEST_PARENT="$(dirname "$DEST_DIR")"
mkdir -p "$DEST_PARENT"
TMP_DEST="$DEST_PARENT/.htsy-install.$$"
rm -rf "$TMP_DEST"
mkdir -p "$TMP_DEST"
cp -R "$SOURCE_DIR/." "$TMP_DEST/"

rm -rf "$DEST_DIR"
mv "$TMP_DEST" "$DEST_DIR"
TMP_DEST=""

echo "Installed htsy skill to: $DEST_DIR"
echo "Verify: $DEST_DIR/SKILL.md"