#!/bin/sh

# Starts the MCP server (server.mjs), installing its pinned dependencies first when they are
# missing or the lockfile changed. Arguments go to server.mjs: none for stdio, which MCP clients
# launch once per session, or --http HOST:PORT for a shared server. --install-only installs and
# exits, which is worth doing once after cloning so the first client start is not a long one.
#
# stdout is the MCP protocol, so everything here writes to stderr.

set -eu

here="$(cd "$(dirname "$0")" && pwd)"

# MCP clients start servers with a bare environment: Claude Desktop in particular has no node on
# its PATH. Add the usual places one is installed, without disturbing an inherited PATH.
PATH="${PATH}:${HOME}/.local/share/n/bin:${HOME}/.volta/bin:/opt/homebrew/bin:/usr/local/bin"
export PATH

# nvm installs per version, with no stable bin directory, so take the newest it has.
if ! command -v node >/dev/null 2>&1; then
    for dir in "${HOME}"/.nvm/versions/node/*/bin; do
        [ -x "${dir}/node" ] && nvm_bin="${dir}"
    done
    [ -n "${nvm_bin:-}" ] && PATH="${nvm_bin}:${PATH}" && export PATH
fi

if ! command -v node >/dev/null 2>&1; then
    echo "pi-chrome-mcp: no node on PATH; install Node 20.6 or newer, or start this with one on PATH" >&2
    exit 1
fi

stamp="${here}/node_modules/.pi-chrome-mcp-deps"
if ! cmp -s "${here}/package-lock.json" "${stamp}" 2>/dev/null; then
    # Two clients starting at once would otherwise run npm ci over each other.
    lock="${here}/.install-lock"
    tries=0
    until mkdir "${lock}" 2>/dev/null; do
        tries=$((tries + 1))
        if [ "${tries}" -gt 120 ]; then
            echo "pi-chrome-mcp: gave up waiting for ${lock}; remove it if no install is running" >&2
            exit 1
        fi
        sleep 1
    done
    trap 'rmdir "${lock}" 2>/dev/null || true' EXIT
    if ! cmp -s "${here}/package-lock.json" "${stamp}" 2>/dev/null; then
        echo "pi-chrome-mcp: installing pinned dependencies" >&2
        npm_config_cache="${here}/.npm-cache" \
            npm ci --prefix "${here}" --no-audit --no-fund --silent >&2
        cp "${here}/package-lock.json" "${stamp}"
    fi
    rmdir "${lock}" 2>/dev/null || true
    trap - EXIT
fi

if [ "${1:-}" = "--install-only" ]; then
    echo "pi-chrome-mcp: ready. The companion extension to load in chrome://extensions: $(cd "${here}/../extensions/chrome-profile-bridge/browser-extension" && pwd)" >&2
    exit 0
fi
exec node "${here}/server.mjs" "$@"