#!/bin/sh
set -eu

origin=${1:-"https://agentchat.innovacors.com"}
# Sin parametro se usa la URL que el servidor inserta en https://agentchat.innovacors.com; si no la inserto, hay que pasarla.
case "$origin" in "{{"*) origin= ;; esac
if [ -z "$origin" ]; then
  echo "Uso: install.sh https://servidor-agentchat" >&2
  exit 2
fi
case "$origin" in
  https://*) ;;
  http://localhost|http://localhost:*|http://127.0.0.1|http://127.0.0.1:*) ;;
  *) echo "Se requiere HTTPS fuera de localhost." >&2; exit 2 ;;
esac
case "$origin" in *'?'*|*'#'*|*'@'*) echo "Origin inválido." >&2; exit 2 ;; esac
origin=${origin%/}
os=$(uname -s)
arch=$(uname -m)
if [ "$os" = Linux ] && [ "$arch" = x86_64 ]; then platform=linux-amd64
elif [ "$os" = Darwin ] && [ "$arch" = arm64 ]; then platform=darwin-arm64
else echo "Plataforma no disponible: $os/$arch" >&2; exit 2; fi

if [ -n "${AGENTCHAT_INSTALL_DIR:-}" ]; then target_dir=$AGENTCHAT_INSTALL_DIR
else target_dir="$HOME/.local/bin"; fi
name=agentchat
tmp=$(mktemp "${TMPDIR:-/tmp}/agentchat.XXXXXX")
backup="${target_dir}/${name}.previous"
cleanup() { rm -f "$tmp"; }
trap cleanup EXIT HUP INT TERM
checksum=$(curl --fail --silent --show-error --proto '=https,http' --proto-redir '=https' "$origin/client/download/$platform.sha256")
expected=$(printf '%s' "$checksum" | awk '{print tolower($1)}')
case "$expected" in *[!0-9a-f]*|'') echo "Checksum inválido." >&2; exit 1 ;; esac
[ "${#expected}" -eq 64 ] || { echo "Checksum inválido." >&2; exit 1; }
curl --fail --silent --show-error --proto '=https,http' --proto-redir '=https' "$origin/client/download/$platform" -o "$tmp"
if command -v sha256sum >/dev/null 2>&1; then actual=$(sha256sum "$tmp" | awk '{print $1}')
elif command -v shasum >/dev/null 2>&1; then actual=$(shasum -a 256 "$tmp" | awk '{print $1}')
else echo "Se necesita sha256sum o shasum para verificar la descarga." >&2; exit 1; fi
[ "$actual" = "$expected" ] || { echo "El checksum no coincide; se canceló la instalación." >&2; exit 1; }
mkdir -p "$target_dir"
chmod 700 "$target_dir"
target="$target_dir/$name"
rm -f "$backup"
if [ -e "$target" ]; then mv "$target" "$backup"; fi
if ! install -m 700 "$tmp" "$target"; then
  if [ -e "$backup" ]; then mv "$backup" "$target"; fi
  exit 1
fi
echo "AgentChat instalado/actualizado: $target"
echo "Para actualizar, vuelve a ejecutar el instalador. Para usarlo: $target --version"