#!/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=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=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=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=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=0.10.0-722-gd10fd78d46

# commit 51ed5416ab2969a366c8c6bdc487f357bad267c3
# Author: Veikka Tuominen <git@vexu.eu>
# Date:   2022-12-12T15:40:18+02:00
#
#     update zig1.wasm to `@call` changes
CALL_CHANGES=0.10.0-749-g51ed5416ab

# 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=0.10.0-853-g2a5e1426aa

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

  # removing the wasi-based stage1 just to be sure
  git rm stage1/zig1.wasm.zst

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

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

  git reset --hard
  git checkout $MERGE_WASI_BOOTSTRAP
  rm stage1/zig1.wasm.zst

  build/stage3/bin/zig build update-zig1

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

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

  echo "Zig bootstrapped from selfhosted."
}

step10() {
  echo "Generating zig1.wasm.zst for $BOUNDFN"
  git archive --prefix=zig-$BOUNDFN/ $BOUNDFN | tar -C .. -x --exclude="stage1/zig1.wasm*"

  {
    pushd "../zig-$BOUNDFN"
    cp ../zig/stage1/zig1.wasm.zst stage1/
    patch -p1 <"$HERE/0.10.0-675-g9d93b2ccf1-TypeOf-hack.patch"
    mkdir build
    {
      pushd build
      CC=clang-15 CXX=clang++-15 cmake ..
      make -j"$(nproc)" install
      popd
    }
    build/stage3/bin/zig build update-zig1
    popd
  }
  echo "zig1.wasm.zst was built for BoundFn hack"
}

step20() {
  echo "Generating zig1.wasm.zst for $C_AARCH64"
  git archive --prefix=zig-$C_AARCH64/ $C_AARCH64 | tar -C .. -x --exclude="stage1/zig1.wasm*"

  {
    pushd "../zig-$C_AARCH64"
    zstd -cd ../zig-$BOUNDFN/stage1/zig1.wasm.zst >stage1/zig1.wasm
    mkdir build
    {
      pushd build
      CC=clang-15 CXX=clang++-15 cmake ..
      make -j"$(nproc)" install
      popd
    }
    build/stage3/bin/zig build update-zig1
    popd
  }
  echo "zig1.wasm.zst was built for C-aarch64 backend"
}

generic() {
  local FROM="$1"
  local TO="$2"

  echo "Updating zig1.wasm from $FROM -> $TO in ../zig-$TO"
  git archive --prefix="zig-$TO/" "$TO" | tar -C .. -x --exclude="stage1/zig1.wasm"

  {
    pushd "../zig-$TO"
    cp "../zig-$FROM/stage1/zig1.wasm" stage1/
    mkdir build
    {
      pushd build
      CC=clang-15 CXX=clang++-15 cmake ..
      make -j"$(nproc)" install
      popd
    }
    build/stage3/bin/zig build update-zig1
    popd
  }
  echo "zig1.wasm updated for $TO"
}

if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
  set -xeuo pipefail
  step00
  step10
  step20
  generic "$C_AARCH64" "$CALL_CHANGES"
  generic "$CALL_CHANGES" "$BUILTIN_TYPE"
fi