#!/bin/sh
# curl -fsSL https://install.tesser.sh | sh
# curl -fsSL https://install.tesser.sh | sh -s -- v0.1.0
set -eu

api="${TESSER_INSTALL_URL:-https://install.tesser.sh}"
bin="$HOME/.tesser/bin"

die() { echo "tesser: $*" >&2; exit 1; }

case "$(uname -s)" in
  Darwin) os=darwin ;;
  Linux) os=linux ;;
  *) die "unsupported OS: $(uname -s)" ;;
esac
case "$(uname -m)" in
  arm64 | aarch64) arch=arm64 ;;
  x86_64 | amd64) arch=x64 ;;
  *) die "unsupported architecture: $(uname -m)" ;;
esac
if [ "$os" = darwin ] && [ "$(sysctl -n sysctl.proc_translated 2>/dev/null)" = 1 ]; then arch=arm64; fi
if [ "$os" = linux ] && [ "$arch" = x64 ] && ! grep -q avx2 /proc/cpuinfo; then arch=x64-baseline; fi
target="$os-$arch"

version="${1:-}"
[ -n "$version" ] || version=$(curl -fsSL "$api/latest") || die "could not reach $api"
version="v${version#v}"
sha=$(curl -fsSL "$api/$version/$target/sha") || die "no tesser $version build for $target"

tmp=$(mktemp -d)
trap 'rm -rf "$tmp"' EXIT
echo "tesser: installing $version ($target)"
curl -fsSL "$api/$version/$target/download" -o "$tmp/tesser.tar.gz"
if command -v sha256sum >/dev/null; then got=$(sha256sum "$tmp/tesser.tar.gz"); else got=$(shasum -a 256 "$tmp/tesser.tar.gz"); fi
[ "${got%% *}" = "$sha" ] || die "checksum mismatch: expected $sha, got ${got%% *}"
tar -xzf "$tmp/tesser.tar.gz" -C "$tmp"
mkdir -p "$bin"
mv -f "$tmp/tesser" "$bin/tesser"
"$bin/tesser" version

case ":$PATH:" in *":$bin:"*) exit 0 ;; esac
line='export PATH="$HOME/.tesser/bin:$PATH"'
shell="${SHELL:-}"
case "${shell##*/}" in
  zsh) rc="${ZDOTDIR:-$HOME}/.zshrc" ;;
  bash) if [ "$os" = darwin ]; then rc="$HOME/.bash_profile"; else rc="$HOME/.bashrc"; fi ;;
  fish) rc="${XDG_CONFIG_HOME:-$HOME/.config}/fish/config.fish" line='set -gx PATH $HOME/.tesser/bin $PATH' ;;
  *) echo "tesser: add $bin to your PATH"; exit 0 ;;
esac
mkdir -p "$(dirname "$rc")"
grep -qsF "$line" "$rc" || printf '\n%s\n' "$line" >> "$rc"
case "$rc" in "$HOME"/*) rc="~${rc#"$HOME"}" ;; esac
echo "tesser: added $bin to PATH in $rc; open a new terminal, or run: source $rc"