#!/usr/bin/env bash
set -xeuo pipefail

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

step00() {
  # 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
  local MERGE_WASI_BOOTSTRAP=0.10.0-610-ge7d28344fa
  git checkout $MERGE_WASI_BOOTSTRAP

  # commit 3ba916584db5485c38ebf2390e8d22bc6d81bf8e
  # Author: Andrew Kelley <andrew@ziglang.org>
  # Date:   2022-11-05T03:47:19+02:00
  #
  #     actually remove stage1
  local REMOVE_STAGE1=0.10.0-542-g3ba916584d
  git revert --no-edit $REMOVE_STAGE1

  # 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.
  local REMOVE_FSTAGE1=0.10.0-539-g28514476ef
  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() {
  cat <<EOF
   This commit:

   commit 9d93b2ccf11f584320a2c5209dd2d94705167695
   Author: Veikka Tuominen <git@vexu.eu>
   Date:   2022-12-08T17:52:05+00:00
  
       Eliminate \$(BoundFn) type from the language
  
       Closes #9484
EOF
  local BOUNDFN=0.10.0-675-g9d93b2ccf1
  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() {
  true
}

step00
step10
step20