#!/bin/sh
# mvrun installer — https://cli.mvirt.io
#
#   curl -fsSL https://cli.mvirt.io | sh
#
# Env knobs:
#   MVRUN_VERSION   version to install (default: latest)
#   MVRUN_INSTALL   install dir       (default: $HOME/.local/bin)
#   MVRUN_BASE      download base URL  (default: https://cli.mvirt.io)
set -eu

BASE="${MVRUN_BASE:-https://cli.mvirt.io}"
VER="${MVRUN_VERSION:-latest}"
DEST="${MVRUN_INSTALL:-$HOME/.local/bin}"

err() { echo "mvrun-install: $*" >&2; exit 1; }

# ---- detect platform -> Rust target triple -------------------------------
OS="$(uname -s)"
ARCH="$(uname -m)"
case "$OS" in
  Linux)  case "$ARCH" in
            x86_64|amd64)          TRIPLE=x86_64-unknown-linux-musl ;;
            aarch64|arm64)         TRIPLE=aarch64-unknown-linux-musl ;;
            *) err "unsupported Linux arch: $ARCH" ;;
          esac ;;
  Darwin) case "$ARCH" in
            x86_64)                TRIPLE=x86_64-apple-darwin ;;
            arm64)                 TRIPLE=aarch64-apple-darwin ;;
            *) err "unsupported macOS arch: $ARCH" ;;
          esac ;;
  *) err "unsupported OS: $OS (Windows? use: irm https://cli.mvirt.io/install.ps1 | iex)" ;;
esac

URL="$BASE/dl/$VER/mvrun-$TRIPLE"

# ---- download ------------------------------------------------------------
have() { command -v "$1" >/dev/null 2>&1; }
have curl || have wget || err "need curl or wget"

TMP="$(mktemp -d)"
trap 'rm -rf "$TMP"' EXIT
fetch() { # url dest
  if have curl; then curl -fsSL "$1" -o "$2"
  else wget -qO "$2" "$1"; fi
}

echo "mvrun-install: downloading $TRIPLE ($VER) ..."
fetch "$URL"        "$TMP/mvrun"    || err "download failed: $URL"
fetch "$URL.sha256" "$TMP/mvrun.sha256" 2>/dev/null || err "checksum download failed: $URL.sha256"

# ---- verify checksum -----------------------------------------------------
WANT="$(awk '{print $1}' "$TMP/mvrun.sha256")"
[ -n "$WANT" ] || err "empty checksum"
if have sha256sum;    then GOT="$(sha256sum "$TMP/mvrun" | awk '{print $1}')"
elif have shasum;     then GOT="$(shasum -a 256 "$TMP/mvrun" | awk '{print $1}')"
else err "need sha256sum or shasum to verify"; fi
[ "$WANT" = "$GOT" ] || err "checksum mismatch (want $WANT, got $GOT)"

# ---- install -------------------------------------------------------------
mkdir -p "$DEST"
chmod 0755 "$TMP/mvrun"
mv -f "$TMP/mvrun" "$DEST/mvrun"

echo "mvrun-install: installed -> $DEST/mvrun"
"$DEST/mvrun" --version 2>/dev/null || true

# ---- add to PATH (idempotent; picks the right rc for the user's shell) ----
add_to_path() {
  dir="$1"
  case ":$PATH:" in *":$dir:"*) return 0 ;; esac   # already effective

  line="export PATH=\"$dir:\$PATH\""
  case "$(basename "${SHELL:-sh}")" in
    zsh)  rc="${ZDOTDIR:-$HOME}/.zshrc" ;;
    bash) [ "$(uname -s)" = Darwin ] && rc="$HOME/.bash_profile" || rc="$HOME/.bashrc" ;;
    fish) rc="$HOME/.config/fish/config.fish"; line="fish_add_path \"$dir\"" ;;
    *)    rc="$HOME/.profile" ;;
  esac

  if [ -f "$rc" ] && grep -qF "$line" "$rc" 2>/dev/null; then
    return 0   # already added on a previous run
  fi
  mkdir -p "$(dirname "$rc")"
  printf '\n# added by mvrun-install (https://cli.mvirt.io)\n%s\n' "$line" >> "$rc"
  echo "mvrun-install: added $dir to PATH in $rc"
  echo "mvrun-install: restart your shell (or: exec \$SHELL) to use 'mvrun'"
}
add_to_path "$DEST"