#!/bin/sh
set -eu

REPO="${GIT_MEMENTO_REPO:-<YOUR_ORG>/<YOUR_REPO>}"
INSTALL_DIR="${GIT_MEMENTO_INSTALL_DIR:-$HOME/.local/bin}"

if [ "$REPO" = "<YOUR_ORG>/<YOUR_REPO>" ]; then
  echo "Set GIT_MEMENTO_REPO to your GitHub repo (owner/name)." >&2
  exit 1
fi

uname_s="$(uname -s)"
uname_m="$(uname -m)"

case "$uname_s" in
  Darwin)
    case "$uname_m" in
      arm64) asset="git-memento-osx-arm64.tar.gz" ;;
      x86_64) asset="git-memento-osx-x64.tar.gz" ;;
      *) echo "Unsupported macOS architecture: $uname_m" >&2; exit 1 ;;
    esac
    ;;
  Linux)
    case "$uname_m" in
      x86_64) asset="git-memento-linux-x64.tar.gz" ;;
      *) echo "Unsupported Linux architecture: $uname_m (only x86_64 release asset is published)." >&2; exit 1 ;;
    esac
    ;;
  MINGW*|MSYS*|CYGWIN*|Windows_NT)
    case "$uname_m" in
      x86_64|amd64|AMD64) asset="git-memento-win-x64.zip" ;;
      *) echo "Unsupported Windows architecture: $uname_m (only x64 release asset is published)." >&2; exit 1 ;;
    esac
    ;;
  *)
    echo "Unsupported OS: $uname_s" >&2
    exit 1
    ;;
esac

download_url="https://github.com/$REPO/releases/latest/download/$asset"

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

archive="$tmpdir/$asset"
if command -v curl >/dev/null 2>&1; then
  if ! curl -fsSL "$download_url" -o "$archive"; then
    echo "Could not download $asset from latest release in $REPO" >&2
    exit 1
  fi
elif command -v wget >/dev/null 2>&1; then
  if ! wget -qO "$archive" "$download_url"; then
    echo "Could not download $asset from latest release in $REPO" >&2
    exit 1
  fi
else
  echo "Neither curl nor wget is available to download release assets." >&2
  exit 1
fi

mkdir -p "$INSTALL_DIR"

case "$asset" in
  *.tar.gz)
    tar -xzf "$archive" -C "$tmpdir"
    cp "$tmpdir/git-memento" "$INSTALL_DIR/git-memento"
    chmod +x "$INSTALL_DIR/git-memento"
    ;;
  *.zip)
    if command -v unzip >/dev/null 2>&1; then
      unzip -q "$archive" -d "$tmpdir"
    elif command -v powershell.exe >/dev/null 2>&1; then
      powershell.exe -NoProfile -Command "Expand-Archive -Path '$archive' -DestinationPath '$tmpdir' -Force" >/dev/null
    else
      echo "zip extraction requires unzip or powershell.exe." >&2
      exit 1
    fi
    cp "$tmpdir/git-memento.exe" "$INSTALL_DIR/git-memento.exe"
    ;;
esac

echo "Installed git-memento to $INSTALL_DIR"
echo "Ensure $INSTALL_DIR is in your PATH."