#!/bin/sh
# git-ark installer for macOS and Linux.
#
#   curl -fsSL https://raw.githubusercontent.com/boomctl/git-ark/main/install.sh | sh
#
# Downloads the latest release binary for your OS/arch, verifies its SHA-256
# against the release's SHA256SUMS, and installs it. This installs the *client*;
# hosts get their binary from `git-ark host add`.
#
# Env:
#   GIT_ARK_BINDIR   install directory (default: $HOME/.local/bin)
#   GIT_ARK_VERSION  release tag to install (default: latest)
set -eu

REPO="boomctl/git-ark"
BINDIR="${GIT_ARK_BINDIR:-$HOME/.local/bin}"
VERSION="${GIT_ARK_VERSION:-latest}"

say() { printf '%s\n' "$*"; }
die() { printf 'git-ark install: %s\n' "$*" >&2; exit 1; }
have() { command -v "$1" >/dev/null 2>&1; }

os=$(uname -s)
arch=$(uname -m)
case "$os" in
  Linux)  plat="unknown-linux-musl" ;;
  Darwin) plat="apple-darwin" ;;
  *) die "unsupported OS '$os' — on Windows use install.ps1" ;;
esac
case "$arch" in
  x86_64|amd64)   cpu="x86_64" ;;
  aarch64|arm64)  cpu="aarch64" ;;
  *) die "unsupported architecture '$arch'" ;;
esac
asset="git-ark-${cpu}-${plat}"

if [ "$VERSION" = "latest" ]; then
  base="https://github.com/$REPO/releases/latest/download"
else
  base="https://github.com/$REPO/releases/download/$VERSION"
fi

dl() { # url dest
  if have curl; then curl -fsSL --proto '=https' "$1" -o "$2"
  elif have wget; then wget -qO "$2" "$1"
  else die "need curl or wget"; fi
}

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

say "downloading $asset ($VERSION)…"
dl "$base/$asset" "$tmp/git-ark" || die "download failed — is there a release for $asset?"
dl "$base/SHA256SUMS" "$tmp/SHA256SUMS" || die "could not fetch SHA256SUMS"

want=$(grep " ${asset}\$" "$tmp/SHA256SUMS" | awk '{print $1}')
[ -n "$want" ] || die "no checksum for $asset in SHA256SUMS"
if have sha256sum; then got=$(sha256sum "$tmp/git-ark" | awk '{print $1}')
elif have shasum;  then got=$(shasum -a 256 "$tmp/git-ark" | awk '{print $1}')
else die "need sha256sum or shasum to verify the download"; fi
[ "$want" = "$got" ] || die "checksum mismatch (expected $want, got $got)"

mkdir -p "$BINDIR"
chmod 755 "$tmp/git-ark"
mv "$tmp/git-ark" "$BINDIR/git-ark"
say "installed git-ark → $BINDIR/git-ark"

case ":${PATH}:" in
  *":$BINDIR:"*) ;;
  *) say "note: $BINDIR is not on your PATH — add it, e.g.  export PATH=\"$BINDIR:\$PATH\"" ;;
esac
"$BINDIR/git-ark" --version 2>/dev/null || true