#!/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 35184bff75420f405cb703c9cf86b196843b9a94 (HEAD)
# Author: r00ster91 <r00ster91@proton.me>
# Date:   2022-12-13T23:30:06+02:00
#
#     std.builtin: rename Type.UnionField and Type.StructField's field_type to type
BUILTIN_TYPE=aac2d6b56f32134ea32fb3d984e3fcdfddd8aaf6
BUILTIN_TYPE_=0.10.0-851-gaac2d6b56f

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

# commit 54160e7f6aecb4628df633ceaef4c6d956429a3d
# Author: Veikka Tuominen <git@vexu.eu>
# Date:   2022-12-21T14:33:02+02:00
#
#     Sema: make overflow arithmetic builtins return tuples
BUILTINS_4TO2=54160e7f6aecb4628df633ceaef4c6d956429a3d
BUILTINS_4TO2_=0.10.0-961-g54160e7f6a

# commit 622311fb9ac7ee6d93dcb8cda4b608751f7e092a
# Author: Veikka Tuominen <git@vexu.eu>
# Date:   2022-12-21T16:40:30+02:00
#
#     update uses of overflow arithmetic builtins
BUILTINS_4TO2_USES=622311fb9ac7ee6d93dcb8cda4b608751f7e092a
BUILTINS_4TO2_USES_=0.10.0-962-g622311fb9a

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."
}

step01() {
  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"
}

step02() {
  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"
}

step03() {
  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"
}

step04() {
  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_"
}

step05() {
  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
    popd
  }
}

step06() {
  local FROM_="$BUILTIN_TYPE_"
  local TO="$REMOVE_BUILTIN_TYPE"
  local TO_="$REMOVE_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_"
    "../zig-$FROM_/build/stage3/bin/zig" build update-zig1
    popd
  }
  echo "zig1.wasm updated for $TO_"
}

step07() {
  local FROM_="$REMOVE_BUILTIN_TYPE_"
  local TO="$BUILTINS_4TO2"
  local TO_="$BUILTINS_4TO2_"

  echo "Building zig2 from $FROM_ -> $TO_ in ../zig-$TO_"
  rm -fr "../zig-$TO_"
  git archive --prefix=zig-$TO_/ $TO | tar -C .. -x
  {
    pushd "../zig-$TO_"
    patch -p1 <"$HERE/0.10.0-961-g54160e7f6a-CMakeLists.txt-remove-stage3.patch"
    cp ../zig-$FROM_/stage1/zig1.wasm stage1/zig1.wasm

    # same as "fullbuild", except the make target does not have "install"
    rm -fr build
    mkdir build
    {
      pushd build
      CC=clang-15 CXX=clang++-15 cmake ..
      make -j"$(nproc)"
      popd
    }
    popd
  }
}

step08() {
  local FROM_="$BUILTINS_4TO2_"
  local TO="$BUILTINS_4TO2_USES"
  local TO_="$BUILTINS_4TO2_USES_"

  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_"
    ../zig-$FROM_/build/zig2 build --zig-lib-dir lib update-zig1
    popd
  }
}

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

  # works:
  if [[ "$step" -le 0 ]]; then step00; fi
  if [[ "$step" -le 1 ]]; then step01; fi
  if [[ "$step" -le 2 ]]; then step02; fi
  if [[ "$step" -le 3 ]]; then step03; fi
  if [[ "$step" -le 4 ]]; then step04; fi
  if [[ "$step" -le 5 ]]; then step05; fi
  if [[ "$step" -le 6 ]]; then step06; fi
  if [[ "$step" -le 7 ]]; then step07; fi
  if [[ "$step" -le 8 ]]; then step08; fi
fi