#!/bin/sh
# modelgrid chat installer, served at https://install.modelgrid.com
#
#   curl -fsSL https://install.modelgrid.com | bash
#
# Installs the npm package `modelgrid` for the current user with the npm of the
# Node.js on PATH. Without root: when npm's global directory is not writable,
# the package goes to ~/.local instead. Nothing is downloaded and run besides
# what npm installs. Source: https://code.foss.global/modelgrid.com/landingpage
set -eu

# modelgrid and FlexHarness declare "engines": { "node": ">=24" }
MIN_NODE_MAJOR=24
PACKAGE=modelgrid

say() {
  printf '%s\n' "$*"
}

fail() {
  printf 'modelgrid: %s\n' "$*" >&2
  exit 1
}

if ! command -v node >/dev/null 2>&1; then
  fail "Node.js ${MIN_NODE_MAJOR} or later is needed and was not found on PATH.
Install it from https://nodejs.org (or with your package manager or nvm), then run this again."
fi

node_version=$(node -p 'process.versions.node' 2>/dev/null || true)
node_major=${node_version%%.*}
case $node_major in
  '' | *[!0-9]*) fail "could not read the version of $(command -v node)." ;;
esac
if [ "$node_major" -lt "$MIN_NODE_MAJOR" ]; then
  fail "Node.js ${node_version} is too old; modelgrid needs ${MIN_NODE_MAJOR} or later.
Update it from https://nodejs.org (or with your package manager or nvm), then run this again."
fi

if ! command -v npm >/dev/null 2>&1; then
  fail "npm was not found on PATH next to Node.js ${node_version}. Install npm, then run this again."
fi

# where `npm install -g` writes: <prefix>/lib/node_modules and <prefix>/bin
prefix=$(npm prefix -g)
target=$prefix/lib/node_modules
while [ ! -d "$target" ] && [ "$target" != "/" ]; do
  target=$(dirname "$target")
done

if [ -w "$target" ] && { [ ! -d "$prefix/bin" ] || [ -w "$prefix/bin" ]; }; then
  say "Installing ${PACKAGE} with npm into ${prefix} (Node.js ${node_version})…"
  npm install -g "$PACKAGE"
  bin_dir=$prefix/bin
else
  prefix=$HOME/.local
  say "npm's global directory is not writable; installing ${PACKAGE} into ${prefix} (Node.js ${node_version})…"
  npm install -g --prefix "$prefix" "$PACKAGE"
  bin_dir=$prefix/bin
fi

data_dir=${XDG_DATA_HOME:-$HOME/.local/share}/modelgrid

say ""
say "modelgrid is installed: ${bin_dir}/modelgrid-chat"
case ":${PATH}:" in
  *":${bin_dir}:"*) ;;
  *)
    say ""
    say "${bin_dir} is not on your PATH. Add it, for example in ~/.profile:"
    say "  export PATH=\"${bin_dir}:\$PATH\""
    ;;
esac
say ""
say "Start it on a machine with the AGL inference proxy:"
say "  modelgrid-chat --agl"
say "or against your own OpenAI-compatible servers:"
say "  MODELGRID_BACKENDS='[{\"name\":\"local\",\"baseUrl\":\"http://localhost:8000/v1\"}]' modelgrid-chat"
say ""
say "It prints the address to open. Conversations, the access token and the lock live in"
say "  ${data_dir}"
say "(--data <dir> or MODELGRID_DATA_DIR choose another directory)."