#!/usr/bin/env bash
# Validate prerequisites without installing packages or modifying the runner host.
set -euo pipefail

fail() { printf 'Runner prerequisite: %s\n' "$*" >&2; exit 1; }
for tool in git curl unzip python3; do
  command -v "$tool" >/dev/null || fail "install $tool in the job environment"
done

case "${1:-}" in
  android|emulator)
    [[ "$(uname -s)" == Linux && "$(uname -m)" == x86_64 ]] || fail 'ubuntu-latest must provide Linux x86_64'
    if [[ "$1" == emulator ]]; then
      [[ -c /dev/kvm && -r /dev/kvm && -w /dev/kvm ]] || fail 'expose /dev/kvm to the job and grant the runner user read/write access (nested virtualization required on VMs)'
    fi
    ;;
  ios)
    [[ "$(uname -s)" == Darwin && "$(uname -m)" == arm64 ]] || fail 'macos-arm64 must execute natively on the Apple Silicon host'
    command -v xcodebuild >/dev/null || fail 'install full Xcode and select it with xcode-select'
    xcodebuild -version
    xcrun --find swift >/dev/null
    xcrun simctl list devices available >/dev/null
    ;;
  *) fail 'usage: bash scripts/check-ci-runner.sh android|emulator|ios' ;;
esac