#!/bin/sh
# Installs the agenthub CLI:
#
#   curl -fsSL https://get.theagenthub.app | sh
#
# Settings, all optional:
#   AGENTHUB_VERSION=v0.2.0       a specific release instead of the latest
#   AGENTHUB_INSTALL_DIR=/usr/local/bin   where to put it (default ~/.local/bin)
#   AGENTHUB_DOWNLOAD_URL=...     another server with the same layout
#
# The server layout: /latest holds the newest version (like "v0.2.0"), and
# /releases/<version>/ holds agenthub-<os>-<arch>[.exe] plus SHA256SUMS.
set -eu

base="${AGENTHUB_DOWNLOAD_URL:-https://get.theagenthub.app}"
dir="${AGENTHUB_INSTALL_DIR:-$HOME/.local/bin}"

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

if command -v curl >/dev/null 2>&1; then
  fetch() { curl -fsSL --proto '=https' --tlsv1.2 -o "$2" "$1"; }
elif command -v wget >/dev/null 2>&1; then
  fetch() { wget -q --https-only -O "$2" "$1"; }
else
  fail "needs curl or wget"
fi

case "$(uname -s)" in
  Darwin) os=darwin ;;
  Linux) os=linux ;;
  MINGW* | MSYS* | CYGWIN*) fail "on Windows, run in PowerShell: irm https://get.theagenthub.app/install.ps1 | iex" ;;
  *) fail "no build for $(uname -s); see https://theagenthub.app for other ways to install" ;;
esac

case "$(uname -m)" in
  x86_64 | amd64) arch=x64 ;;
  arm64 | aarch64) arch=arm64 ;;
  *) fail "no build for $(uname -m)" ;;
esac
# A shell running under Rosetta reports x86_64 on Apple silicon; the native build is better.
if [ "$os" = darwin ] && [ "$arch" = x64 ] && [ "$(sysctl -n sysctl.proc_translated 2>/dev/null || true)" = 1 ]; then
  arch=arm64
fi
# The Linux builds link against glibc, so they don't run on musl (Alpine).
if [ "$os" = linux ] && ldd --version 2>&1 | grep -qi musl; then
  fail "the Linux builds need glibc, and this system uses musl (Alpine)"
fi

tmp="$(mktemp -d)"
trap 'rm -rf "$tmp"' EXIT INT TERM

version="${AGENTHUB_VERSION:-}"
if [ -z "$version" ]; then
  fetch "$base/latest" "$tmp/latest" || fail "couldn't reach $base"
  version="$(tr -d ' \r\n' < "$tmp/latest")"
fi
case "$version" in v*) ;; *) version="v$version" ;; esac

file="agenthub-$os-$arch"
say "Downloading agenthub $version ($os-$arch)..."
fetch "$base/releases/$version/$file" "$tmp/$file" || fail "couldn't download $base/releases/$version/$file"
fetch "$base/releases/$version/SHA256SUMS" "$tmp/SHA256SUMS" || fail "couldn't download the checksums"

expected="$(awk -v f="$file" '$2 == f || $2 == "*" f { print $1 }' "$tmp/SHA256SUMS")"
[ -n "$expected" ] || fail "$file isn't listed in SHA256SUMS"
if command -v sha256sum >/dev/null 2>&1; then
  actual="$(sha256sum "$tmp/$file" | awk '{ print $1 }')"
else
  actual="$(shasum -a 256 "$tmp/$file" | awk '{ print $1 }')"
fi
[ "$actual" = "$expected" ] || fail "checksum mismatch for $file, not installing"

mkdir -p "$dir"
chmod 755 "$tmp/$file"
mv -f "$tmp/$file" "$dir/agenthub" 2>/dev/null || fail "couldn't write to $dir (set AGENTHUB_INSTALL_DIR, or run with sudo)"
say "Installed $("$dir/agenthub" --version 2>/dev/null || echo "$version") to $dir/agenthub"

case ":$PATH:" in
  *":$dir:"*) ;;
  *)
    say ""
    say "$dir isn't on your PATH. Add it with:"
    case "${SHELL:-}" in
      */zsh) say "  echo 'export PATH=\"$dir:\$PATH\"' >> ~/.zshrc && exec zsh" ;;
      */fish) say "  fish_add_path $dir" ;;
      *) say "  echo 'export PATH=\"$dir:\$PATH\"' >> ~/.bashrc && exec bash" ;;
    esac
    ;;
esac

say ""
say "Next: agenthub login --hub https://hub.theagenthub.app"