#!/bin/bash
# cmd/install_callback - post-install hook
# Prefers bundled uv binary, creates Python venv, syncs deps, verifies dist.
# Also validates the user-selected Node.js version is actually installed.

APP_DIR="${TRIM_APPDEST}/langbot"

# --- Resolve data directory ---
# LangBot loads config CWD-relative (data/config.yaml); cmd/main replaces
# APP_DIR/data with a symlink to this persistent dir on every start.
DATA_DIR="${TRIM_DATA_SHARE_PATHS%%:*}"
if [ -z "${DATA_DIR}" ]; then
    DATA_DIR="${TRIM_PKGVAR}/data"
fi

cd "${APP_DIR}" || {
    echo "App directory missing after install" > "${TRIM_TEMP_LOGFILE}"
    exit 1
}

# --- Ensure data directory exists ---
mkdir -p "${DATA_DIR}/plugins" "${DATA_DIR}/box" "${DATA_DIR}/logs" || {
    echo "Data share not writable: ${DATA_DIR}" > "${TRIM_TEMP_LOGFILE}"
    exit 1
}

# --- Writable HOME and tool caches ---
# Under run-as: package the generated user's system HOME and the app install
# dir (TRIM_APPDEST) can be read-only; uv aborts if it cannot initialise its
# cache. Point HOME / UV_CACHE_DIR at the persistent data share and keep the
# venv there too (UV_PROJECT_ENVIRONMENT), instead of inside APP_DIR.
VENV_DIR="${DATA_DIR}/.venv"
export HOME="${DATA_DIR}/.home"
export UV_CACHE_DIR="${DATA_DIR}/.cache/uv"
# Never download a managed CPython (the download host is unreachable on many
# NAS networks); use the distro Python only — fail loudly if it is missing.
export UV_PYTHON_DOWNLOADS=never
mkdir -p "${HOME}" "${UV_CACHE_DIR}" || {
    echo "Data share not writable: ${DATA_DIR}" > "${TRIM_TEMP_LOGFILE}"
    exit 1
}

# Real uv/pip errors are captured here for diagnosis (the installer popup
# only shows the short message we write to TRIM_TEMP_LOGFILE).
DEBUG_LOG="${DATA_DIR}/logs/install-debug.log"

# --- Pre-seed config.yaml with the user-selected web port ---
# Data root points at the persistent share (LANGBOT_DATA_ROOT is exported by
# cmd/main at start), so this config survives app upgrades.
# LangBot copies templates/config.yaml there on first boot only if missing,
# so we seed it ourselves with the chosen port.
PORT="${wizard_port:-5300}"
case "${PORT}" in
    ''|*[!0-9]*) PORT="5300" ;;
esac
TEMPLATE_FILE="${APP_DIR}/src/langbot/templates/config.yaml"

_patch_config() {
    local cfg_dir="$1"
    local cfg_file="${cfg_dir}/config.yaml"
    mkdir -p "${cfg_dir}" || {
        echo "Cannot create config directory: ${cfg_dir}" > "${TRIM_TEMP_LOGFILE}"
        exit 1
    }
    if [ ! -f "${cfg_file}" ] && [ -f "${TEMPLATE_FILE}" ]; then
        cp "${TEMPLATE_FILE}" "${cfg_file}"
    fi
    if [ -f "${cfg_file}" ]; then
        sed -i -E "/^api:/,/^[a-z_]+:/ s/^([[:space:]]*port:).*/\1 ${PORT}/" "${cfg_file}"
        sed -i "s#webhook_prefix: 'http://127\.0\.0\.1:[0-9]*'#webhook_prefix: 'http://127.0.0.1:${PORT}'#" "${cfg_file}"
    fi
}

# Seed the persistent dir AND the CWD-relative APP_DIR/data (cmd/main merges
# the latter into the persistent dir via symlink on first start, so the port
# survives regardless of which path ends up being read).
_patch_config "${DATA_DIR}"
if [ "${APP_DIR}/data" != "${DATA_DIR}" ]; then
    _patch_config "${APP_DIR}/data"
fi

# --- Fallback patch for desktop entry port ---
# fnOS natively substitutes ${wizard_port} in ui/config at install time.
# This only kicks in if the placeholder somehow survived (e.g. CLI install).
UI_CONFIG="${TRIM_APPDEST}/ui/config"
if [ -f "${UI_CONFIG}" ] && grep -q 'wizard_port\|{port}' "${UI_CONFIG}"; then
    sed -i "s/\${wizard_port}/${PORT}/g; s/{port}/${PORT}/g" "${UI_CONFIG}"
fi

# --- Validate user-selected Node.js version is installed ---
NODE_VERSION="${wizard_node_version:-22}"
if [ ! -d "/var/apps/nodejs_v${NODE_VERSION}" ]; then
    echo "Node.js v${NODE_VERSION} 未安装：请先在应用中心安装 nodejs_v${NODE_VERSION}，再重新安装本应用。" > "${TRIM_TEMP_LOGFILE}"
    exit 1
fi

# --- CPU architecture (must be resolved before locating bundled binaries) ---
ARCH=$(uname -m)
case "${ARCH}" in
    x86_64|aarch64) ;;
    *)
        echo "Unsupported CPU architecture: ${ARCH}" > "${TRIM_TEMP_LOGFILE}"
        exit 1
        ;;
esac

# --- Python: official python312 App Store app (same borrow pattern as Node.js) ---
PYTHON_APP="python312"
PYTHON_BIN="/var/apps/${PYTHON_APP}/target/bin/python3"
if [ ! -d "/var/apps/${PYTHON_APP}" ]; then
    echo "未找到官方 Python 环境：请先在应用中心安装 ${PYTHON_APP}，再重新安装本应用。" > "${TRIM_TEMP_LOGFILE}"
    exit 1
fi
[ -x "${PYTHON_BIN}" ] || {
    echo "Python 解释器缺失或不可执行：${PYTHON_BIN}" > "${TRIM_TEMP_LOGFILE}"
    exit 1
}

PY_VER=$("${PYTHON_BIN}" -c 'import sys; print(f"{sys.version_info.major}.{sys.version_info.minor}")' 2>/dev/null)
if [ -z "${PY_VER}" ]; then
    echo "Python 3.11+ required but not found on this system" > "${TRIM_TEMP_LOGFILE}"
    exit 1
fi
PY_MAJOR=$(echo "${PY_VER}" | cut -d. -f1)
PY_MINOR=$(echo "${PY_VER}" | cut -d. -f2)
if [ "${PY_MAJOR}" -lt 3 ] || { [ "${PY_MAJOR}" -eq 3 ] && [ "${PY_MINOR}" -lt 11 ]; }; then
    echo "Python 3.11+ required, found ${PY_VER}" > "${TRIM_TEMP_LOGFILE}"
    exit 1
fi

# --- Resolve uv: run the bundled binary in place (single canonical path) ---
UV_BIN="${TRIM_APPDEST}/bin/uv-${ARCH}"
[ -x "${UV_BIN}" ] || {
    echo "Bundled uv binary missing or not executable: ${UV_BIN}" > "${TRIM_TEMP_LOGFILE}"
    exit 1
}

# --- Create venv via uv (on the writable data share, not APP_DIR) ---
if [ ! -d "${VENV_DIR}" ]; then
    {
        echo "== whoami: $(id 2>&1)"
        echo "== APP_DIR perms: $(ls -ld "${APP_DIR}" 2>&1)"
        echo "== DATA_DIR perms: $(ls -ld "${DATA_DIR}" 2>&1)"
        echo "== HOME=${HOME} UV_CACHE_DIR=${UV_CACHE_DIR}"
        "${UV_BIN}" venv "${VENV_DIR}" --python "${PYTHON_BIN}"
    } >> "${DEBUG_LOG}" 2>&1 || {
        echo "Failed to create Python virtual environment via uv. See ${DEBUG_LOG}" > "${TRIM_TEMP_LOGFILE}"
        exit 1
    }
fi

# --- Sync dependencies (install into the relocated venv) ---
if ! UV_PROJECT_ENVIRONMENT="${VENV_DIR}" "${UV_BIN}" sync --extra seekdb >> "${DEBUG_LOG}" 2>&1; then
    echo "Dependency sync failed. Check network connectivity. See ${DEBUG_LOG}" > "${TRIM_TEMP_LOGFILE}"
    exit 1
fi

# --- Verify frontend dist ---
if [ ! -d "web/dist" ] || [ -z "$(ls -A web/dist 2>/dev/null)" ]; then
    echo "Frontend dist missing! Web UI will not be available." > "${TRIM_TEMP_LOGFILE}"
    exit 1
fi

# --- Prepare a writable HOME inside the data dir for tool caches (uv,
# npm/npx MCP). Everything already runs as the package user (run-as:
# package), so no chown is needed — files created here belong to it.
mkdir -p "${DATA_DIR}/.home" 2>/dev/null || true

exit 0