#!/usr/bin/env bash
# Install just enough Android SDK to build this app, idempotently.
#
# Used by CI, and usable by hand on a fresh machine. Everything lands in
# $ANDROID_HOME (default /opt/android-sdk), so pointing a cache or a volume at
# that directory makes the whole thing a no-op on later runs.
#
# Two package names are worth knowing:
#
#   * `platforms;android-37.0` — Android's new minor-version scheme. Plain
#     `android-37` does not exist and sdkmanager will not tell you why.
#   * `build-tools;37.0.0` — needed for `apksigner`, which is how a release job
#     proves what key it actually signed with.
set -euo pipefail

SDK_ROOT="${ANDROID_HOME:-/opt/android-sdk}"
COMPILE_SDK="$(sed -n 's/^compileSdk = "\(.*\)"/\1/p' "$(dirname "$0")/../gradle/libs.versions.toml")"
BUILD_TOOLS="${BUILD_TOOLS:-${COMPILE_SDK}.0.0}"
CMDLINE_VERSION="13114758"  # cmdline-tools 17.0, the one that knows about minor platforms

mkdir -p "$SDK_ROOT"

if [ ! -x "$SDK_ROOT/cmdline-tools/latest/bin/sdkmanager" ]; then
  echo "==> fetching cmdline-tools"
  tmp="$(mktemp -d)"
  curl -fsSL -o "$tmp/tools.zip" \
    "https://dl.google.com/android/repository/commandlinetools-linux-${CMDLINE_VERSION}_latest.zip"
  unzip -q "$tmp/tools.zip" -d "$tmp"
  mkdir -p "$SDK_ROOT/cmdline-tools"
  rm -rf "$SDK_ROOT/cmdline-tools/latest"
  mv "$tmp/cmdline-tools" "$SDK_ROOT/cmdline-tools/latest"
  rm -rf "$tmp"
fi

export PATH="$SDK_ROOT/cmdline-tools/latest/bin:$PATH"

echo "==> licences"
# `yes` writes forever; once sdkmanager has read every licence it exits and
# `yes` dies of SIGPIPE. With `pipefail` that becomes exit 141 and fails the
# job, so the pipeline is judged on sdkmanager's status alone. Real failures
# (no network, bad SDK root) still fail it.
set +o pipefail
yes | sdkmanager --sdk_root="$SDK_ROOT" --licenses >/dev/null
set -o pipefail

echo "==> platform-tools, platforms;android-${COMPILE_SDK}.0, build-tools;${BUILD_TOOLS}"
sdkmanager --sdk_root="$SDK_ROOT" \
  "platform-tools" \
  "platforms;android-${COMPILE_SDK}.0" \
  "build-tools;${BUILD_TOOLS}" >/dev/null

echo "==> $SDK_ROOT is ready"