#!/bin/bash
# Fetches/builds everything build.sh needs into $TOOLS (default ./toolchain), with only
# Java 17+, git, curl, python3 (+ cryptography for make_roots.py) and npm's registry.
set -euo pipefail
cd "$(dirname "$0")/.."
PROJ=$PWD
T=${TOOLS:-$PWD/toolchain}
mkdir -p "$T" && cd "$T"

echo "== aapt2 (prebuilt, from the aaptjs3 npm package)"
if [ ! -x aapt2 ]; then
  mkdir -p dl && curl -sSL -o dl/aapt.tgz "$(curl -sS https://registry.npmjs.org/aaptjs3/latest | python3 -c 'import json,sys;print(json.load(sys.stdin)["dist"]["tarball"])')"
  tar xzf dl/aapt.tgz -C dl && cp dl/package/bin/x64/linux/aapt2 . && chmod +x aapt2
fi

echo "== android-8 platform jar"
if [ ! -f platforms/android-8/android.jar ]; then
  git clone --depth 1 --filter=blob:none --sparse https://github.com/Sable/android-platforms platforms
  (cd platforms && git sparse-checkout set android-8)
fi

echo "== dx (built from AOSP source)"
if [ ! -f dx.jar ]; then
  git clone --depth 1 --branch android10-release --filter=blob:none --sparse https://github.com/aosp-mirror/platform_dalvik dalvik
  (cd dalvik && git sparse-checkout set dx/src)
  mkdir -p dxbuild && find dalvik/dx/src -name '*.java' > dxsrc.txt
  javac -nowarn -encoding UTF-8 -d dxbuild @dxsrc.txt
  jar cfe dx.jar com.android.dx.command.Main -C dxbuild .
fi

echo "== Bouncy Castle sources, renamed to com.minamp.bc"
if [ ! -d bcsrc ]; then
  git clone --depth 1 --filter=blob:none --sparse https://github.com/bcgit/bc-java bc
  (cd bc && git sparse-checkout set core/src/main/java tls/src/main/java util/src/main/java)
  mkdir -p bcsrc/com/minamp
  cp -r bc/core/src/main/java/org/bouncycastle bcsrc/com/minamp/bc
  cp -r --update=none bc/tls/src/main/java/org/bouncycastle/* bcsrc/com/minamp/bc/
  cp -r --update=none bc/util/src/main/java/org/bouncycastle/* bcsrc/com/minamp/bc/
  grep -rl 'org\.bouncycastle' bcsrc | xargs sed -i 's/org\.bouncycastle/com.minamp.bc/g'
  # Android 2.2 has no Long.compare / compareUnsigned / divideUnsigned / parseUnsignedLong
  python3 - bcsrc/com/minamp/bc/util/Longs.java <<'PY'
import sys
p = sys.argv[1]; s = open(p).read()
s = s.replace("return Long.compare(x, y);", "return x < y ? -1 : (x == y ? 0 : 1);")
s = s.replace("return Long.compareUnsigned(x, y);", "return compare(x + Long.MIN_VALUE, y + Long.MIN_VALUE);")
s = s.replace("return Long.divideUnsigned(x, y);", """if (y < 0) { return compareUnsigned(x, y) < 0 ? 0L : 1L; }
        if (x >= 0) { return x / y; }
        long q = ((x >>> 1) / y) << 1;
        long r = x - q * y;
        return q + (compareUnsigned(r, y) >= 0 ? 1 : 0);""")
s = s.replace("return Long.parseUnsignedLong(s);", "return new java.math.BigInteger(s).longValue();")
open(p, "w").write(s)
PY
  python3 "$PROJ/tools/patch_bc_dalvik.py" bcsrc
fi

echo "== signing key"
if [ ! -f minamp.keystore ]; then
  if [ -f "$PROJ/signing/minamp.keystore" ]; then cp "$PROJ/signing/minamp.keystore" .; else
  keytool -genkeypair -keystore minamp.keystore -storepass minamp123 -keypass minamp123 -alias minamp \
    -keyalg RSA -keysize 2048 -sigalg SHA1withRSA -validity 20000 -dname "CN=Minamp, O=Minamp"; fi
fi
echo "Toolchain ready in $T — build with: TOOLS=$T ./build.sh"