#!/bin/sh
# Install the tf release binary. Does not clone the repository.
#
#   curl -fsSL https://tweetfactory.sh/install.sh | sh
#
# The site build copies this file to web/site/dist/install.sh. Binaries and
# SHA256SUMS are served from https://tweetfactory.sh/download/, which redirects
# to the public release host. GitHub Release assets are not used.
#
# TF_VERSION=v0.3.0   pin a tag (default: latest)
# TF_INSTALL_DIR=     default: $HOME/.local/bin
set -eu

base="https://tweetfactory.sh/download"
version="${TF_VERSION:-latest}"
dest_dir="${TF_INSTALL_DIR:-$HOME/.local/bin}"

os=$(uname -s)
arch=$(uname -m)
case "$os:$arch" in
  Darwin:arm64) target="darwin-arm64" ;;
  Darwin:x86_64) target="darwin-x64" ;;
  Linux:x86_64|Linux:amd64) target="linux-x64" ;;
  Linux:aarch64|Linux:arm64) target="linux-arm64" ;;
  *)
    echo "install.sh: unsupported platform $os $arch" >&2
    echo "Release binaries: darwin-arm64, darwin-x64, linux-x64, linux-arm64." >&2
    exit 1
    ;;
esac

asset="tf-$target"
if [ "$version" = "latest" ]; then
  version=$(curl -fsSL "$base/latest/VERSION")
  version=$(printf '%s' "$version" | tr -d '[:space:]')
fi
if ! printf '%s\n' "$version" | grep -Eq '^v[0-9]+\.[0-9]+\.[0-9]+$'; then
  echo "install.sh: version must look like v0.3.0 (got ${version})" >&2
  exit 1
fi
prefix="$base/$version"

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

echo "Downloading $asset ($version)"
curl -fsSL "$prefix/$asset" -o "$tmp/$asset"
curl -fsSL "$prefix/SHA256SUMS" -o "$tmp/SHA256SUMS"

expected=$(grep "  ${asset}\$" "$tmp/SHA256SUMS" | awk 'NR==1 { print $1 }' || true)
if [ -z "$expected" ]; then
  echo "install.sh: SHA256SUMS has no entry for $asset" >&2
  exit 1
fi

if command -v sha256sum >/dev/null 2>&1; then
  actual=$(sha256sum "$tmp/$asset" | awk '{ print $1 }')
elif command -v shasum >/dev/null 2>&1; then
  actual=$(shasum -a 256 "$tmp/$asset" | awk '{ print $1 }')
else
  echo "install.sh: need sha256sum or shasum to verify the download" >&2
  exit 1
fi

if [ "$expected" != "$actual" ]; then
  echo "install.sh: checksum mismatch for $asset" >&2
  exit 1
fi

mkdir -p "$dest_dir"
if command -v install >/dev/null 2>&1; then
  install -m 755 "$tmp/$asset" "$dest_dir/tf"
else
  cp "$tmp/$asset" "$dest_dir/tf"
  chmod 755 "$dest_dir/tf"
fi

echo "Installed $dest_dir/tf"
case ":$PATH:" in
  *":$dest_dir:"*) ;;
  *) echo "Add $dest_dir to PATH, then open a new shell." ;;
esac
echo "Next: mkdir a data directory, copy .env.example to .env (tf auth writes the example if it is missing), then run: tf auth"