#!/usr/bin/env bash

HERE=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &>/dev/null && pwd)

# commit e7d28344fa3ee81d6ad7ca5ce1f83d50d8502118
# Merge: 817cf6a82e 20d86d9c63
# Author: Andrew Kelley <andrew@ziglang.org>
# Date:   2022-12-07T01:52:39+02:00
#
#     Merge pull request #13560 from ziglang/wasi-bootstrap
#
#     Nuke the C++ implementation of Zig from orbit using WASI
MERGE_WASI_BOOTSTRAP=e7d28344fa3ee81d6ad7ca5ce1f83d50d8502118
MERGE_WASI_BOOTSTRAP_=0.10.0-610-ge7d28344fa

# commit 3ba916584db5485c38ebf2390e8d22bc6d81bf8e
# Author: Andrew Kelley <andrew@ziglang.org>
# Date:   2022-11-05T03:47:19+02:00
#
#     actually remove stage1
REMOVE_STAGE1=3ba916584db5485c38ebf2390e8d22bc6d81bf8e
REMOVE_STAGE1_=0.10.0-542-g3ba916584d

# commit 28514476ef8c824c3d189d98f23d0f8d23e496ea
# Author: Andrew Kelley <andrew@ziglang.org>
# Date:   2022-11-01T05:29:55+02:00
#
#     remove `-fstage1` option
#
#     After this commit, the self-hosted compiler does not offer the option to
#     use stage1 as a backend anymore.
REMOVE_FSTAGE1=28514476ef8c824c3d189d98f23d0f8d23e496ea
REMOVE_FSTAGE1_=0.10.0-539-g28514476ef

# commit 9d93b2ccf11f584320a2c5209dd2d94705167695
# Author: Veikka Tuominen <git@vexu.eu>
# Date:   2022-12-08T19:52:05+02:00
#
#     Eliminate `BoundFn` type from the language
#
#     Closes #9484
BOUNDFN=9d93b2ccf11f584320a2c5209dd2d94705167695
BOUNDFN_=0.10.0-675-g9d93b2ccf1

# commit d10fd78d4615f329141f5c19f893039d56aff425
# Author: Andrew Kelley <andrew@ziglang.org>
# Date:   2022-12-10T21:54:24+02:00
#
#     update zig1.wasm
#
#     This includes the latest changes from master branch with fixes to the C
#     backend that affect aarch64-windows which are necessary to build from
#     source on this target.
#
#  stage1/zig1.wasm | Bin 2315523 -> 2315899 bytes
#  1 file changed, 0 insertions(+), 0 deletions(-)
C_AARCH64=d10fd78d4615f329141f5c19f893039d56aff425
C_AARCH64_=0.10.0-722-gd10fd78d46

# commit 7b2a936173165002105ba5e76bed69654e132fea
# Author: Veikka Tuominen <git@vexu.eu>
# Date:   2022-12-12T15:32:37+02:00
#
#     remove `stack` option from `@call`
CALL_OPTIONS=7b2a936173165002105ba5e76bed69654e132fea
CALL_OPTIONS_=0.10.0-747-g7b2a936173

# commit 08b2d491bcd8c79c68495267cc71967661caea1e
# Author: Veikka Tuominen <git@vexu.eu>
# Date:   2022-12-12T15:32:37+02:00
#
#     update usages of `@call`
CALL_USAGES=08b2d491bcd8c79c68495267cc71967661caea1e
CALL_USAGES_=0.10.0-748-g08b2d491bc

# commit 2a5e1426aa9469fadb78e837d0100d689213b034
# Author: Veikka Tuominen <git@vexu.eu>
# Date:   2022-12-16T19:44:25+02:00
#
#     update zig1.wasm to builtin.Type field changes
BUILTIN_TYPE=2a5e1426aa9469fadb78e837d0100d689213b034
BUILTIN_TYPE_=0.10.0-853-g2a5e1426aa

fullbuild() {
  rm -fr build
  mkdir build
  pushd build
  CC=clang-15 CXX=clang++-15 cmake ..
  make -j"$(nproc)" install
  popd
}

step00() {
  git checkout $MERGE_WASI_BOOTSTRAP

  git revert --no-edit $REMOVE_STAGE1

  git revert --no-edit -X theirs $REMOVE_FSTAGE1

  git mv stage1/config.zig.in src

  sed -i '/have_stage1/ s/false/true/' src/config.zig.in

  git checkout $REMOVE_FSTAGE1~1 build.zig CMakeLists.txt

  echo "Building the C++ (stage1) implementation"
  fullbuild

  echo "C++ implementation in build/stage3/bin/zig. Will build zig1.wasm.zst."

  git reset --hard
  git checkout $MERGE_WASI_BOOTSTRAP

  build/stage3/bin/zig build update-zig1

  echo "stage1/zig1.wasm.zst built. Bootstrapping zig with it."

  fullbuild

  echo "Zig bootstrapped from selfhosted."
}

step10() {
  local TO="$BOUNDFN"
  local TO_="$BOUNDFN_"
  echo "Generating zig1.wasm.zst for $TO_"
  rm -fr "../zig-$TO_"
  git archive --prefix=zig-$TO_/ $TO | tar -C .. -x

  {
    pushd "../zig-$TO_"
    cp "$OLDPWD/stage1/zig1.wasm.zst" stage1/
    patch -p1 <"$HERE/0.10.0-675-g9d93b2ccf1-TypeOf-hack.patch"
    fullbuild
    build/stage3/bin/zig build update-zig1
    popd
  }
  echo "zig1.wasm.zst was built for BoundFn hack"
}

step20() {
  local FROM="$BOUNDFN"
  local FROM_="$BOUNDFN_"
  local TO="$C_AARCH64"
  local TO_="$C_AARCH64_"
  echo "Generating zig1.wasm.zst for $C_AARCH64_"
  rm -fr "../zig-$TO_"
  git archive --prefix=zig-$TO_/ $TO | tar -C .. -x

  {
    pushd "../zig-$TO_"
    zstd -cd ../zig-$FROM_/stage1/zig1.wasm.zst >stage1/zig1.wasm
    fullbuild
    build/stage3/bin/zig build update-zig1
    popd
  }
  echo "zig1.wasm.zst was built for C-aarch64 backend"
}

step30() {
  local FROM="$C_AARCH64"
  local FROM_="$C_AARCH64_"
  local TO="$CALL_OPTIONS"
  local TO_="$CALL_OPTIONS_"

  echo "Updating zig1.wasm from $FROM_ -> $TO_ in ../zig-$TO_"
  rm -fr "../zig-$TO_"
  git archive --prefix=zig-$TO_/ $TO | tar -C .. -x

  {
    pushd "../zig-$TO_"
    patch -p1 <"$HERE/0.10.0-747-g7b2a936173-CallOptions.patch"
    "../zig-$FROM_/build/stage3/bin/zig" build --zig-lib-dir lib update-zig1
    popd
  }
  echo "zig1.wasm updated for $TO"
}

step40() {
  local FROM="$CALL_OPTIONS"
  local FROM_="$CALL_OPTIONS_"
  local TO="$CALL_USAGES"
  local TO_="$CALL_USAGES_"

  echo "Updating zig1.wasm from $FROM_ -> $TO_ in ../zig-$TO_"
  rm -fr "../zig-$TO_"
  git archive --prefix=zig-$TO_/ $TO | tar -C .. -x

  {
    pushd "../zig-$TO_"
    cp ../zig-$FROM_/stage1/zig1.wasm stage1/zig1.wasm
    fullbuild
    build/stage3/bin/zig build update-zig1
    popd
  }
  echo "zig1.wasm updated for $TO_"
}

step50() {
  local FROM="$CALL_USAGES"
  local FROM_="$CALL_USAGES_"
  local TO="$BUILTIN_TYPE"
  local TO_="$BUILTIN_TYPE_"

  echo "Updating zig1.wasm from $FROM_ -> $TO_ in ../zig-$TO_"
  rm -fr "../zig-$TO_"
  git archive --prefix=zig-$TO_/ $TO | tar -C .. -x
  {
    pushd "../zig-$TO_"
    cp ../zig-$FROM_/stage1/zig1.wasm stage1/zig1.wasm
    fullbuild
    build/stage3/bin/zig build update-zig1
    popd
  }
  echo "zig1.wasm updated for $TO_"
}

if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
  set -xeuo pipefail
  step=${1:-step00}
  step=${step#step}

  # works:
  if [[ "$step" -le 00 ]] ; then step00; fi
  if [[ "$step" -le 10 ]] ; then step10; fi
  if [[ "$step" -le 20 ]] ; then step20; fi
  if [[ "$step" -le 30 ]] ; then step30; fi
  if [[ "$step" -le 40 ]] ; then step40; fi

  # does not work:
  if [[ "$step" -le 50 ]] ; then step50; fi
fi