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

: "${OPENCODE_BASELINE_DIR:=/opt/opencode}"
baseline_version="$(node -p 'require(process.argv[1]).version' "${OPENCODE_BASELINE_DIR}/package.json")"
: "${OPENCODE_NPM_PACKAGE:=opencode-ai@${baseline_version}}"
: "${OPENCODE_INSTALL_DIR:=$HOME/.local/share/opencode}"
: "${OPENCODE_NPM_BIN_DIR:=$HOME/.local/bin}"
: "${OPENCODE_FORCE_INSTALL:=0}"

mkdir -p "${OPENCODE_INSTALL_DIR}" "${OPENCODE_NPM_BIN_DIR}"

if [[ "${OPENCODE_FORCE_INSTALL}" != "1" ]]; then
  if command -v opencode >/dev/null 2>&1; then
    echo "[bootstrap] opencode already available: $(opencode --version 2>/dev/null || echo unknown)"
    exit 0
  fi
  if [[ -x "${OPENCODE_INSTALL_DIR}/node_modules/.bin/opencode" ]]; then
    echo '[bootstrap] restoring the persisted OpenCode installation'
    ln -sf "${OPENCODE_INSTALL_DIR}/node_modules/.bin/opencode" "${OPENCODE_NPM_BIN_DIR}/opencode"
    opencode --version
    exit 0
  fi
  if [[ "${OPENCODE_NPM_PACKAGE}" == "opencode-ai@${baseline_version}" ]]; then
    echo "[bootstrap] using verified image baseline ${baseline_version}"
    test -x "${OPENCODE_BASELINE_DIR}/bin/opencode"
    ln -sf "${OPENCODE_BASELINE_DIR}/bin/opencode" "${OPENCODE_NPM_BIN_DIR}/opencode"
    opencode --version
    exit 0
  fi
fi

echo "[bootstrap] installing ${OPENCODE_NPM_PACKAGE} into ${OPENCODE_INSTALL_DIR}"
package_json="${OPENCODE_INSTALL_DIR}/package.json"
if [[ ! -f "${package_json}" ]]; then
  printf '{"private":true}\n' > "${package_json}"
fi
npm pkg set --prefix "${OPENCODE_INSTALL_DIR}" --json 'allowScripts.opencode-ai=true'
npm install \
  --prefix "${OPENCODE_INSTALL_DIR}" \
  --install-strategy=shallow \
  "${OPENCODE_NPM_PACKAGE}"

if [[ -x "${OPENCODE_INSTALL_DIR}/node_modules/.bin/opencode" ]]; then
  ln -sf "${OPENCODE_INSTALL_DIR}/node_modules/.bin/opencode" "${OPENCODE_NPM_BIN_DIR}/opencode"
fi

command -v opencode >/dev/null 2>&1
opencode --version