#!/bin/bash
# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.

set -e

ERR_CODE_UNCOMMITTED_API_CHANGE=1
ERR_CODE_CANT_FIND_PROJECT=2
ERR_CODE_BAD_COMMIT=3

WARNING_MESSAGE_HEADER=$(cat <<EOF
🚨 React Native Public C++ / Objective-C / Objective-C++ API Change Detected:

It looks like you've changed a public API that could affect our users, potentially breaking libraries and/or products using React Native.
EOF
)

WARNING_MESSAGE_TAIL=$(cat <<EOF

What to do now?
---------------

Nothing for now, we're just tracking this. In the future we'll start adding folks from React Org as reviewers to check these changes align with our public API policy.

EOF
)

ERROR_MENTION_BREAKING_CHANGE=$(cat <<EOF

Commit Message:
---------------

If you did not intend to change React Native's Public API, please revert those changes in this commit. If you did intend to change the Public API, You *MUST* add a changelog entry to your commit message using the "Breaking" type (https://reactnative.dev/contributing/changelogs-in-pull-requests). For example:

## Changelog:
[General][Breaking] - Removed the Foo method to Bar as part of our deprecation mentioned in RFC-123

EOF
)

function check_if_mentions_breaking_change() {
    IN_COMMIT_MESSAGE=$(hg log -r . -T '{desc}' | grep -iE '\[(android|ios|general|internal)\]\s*\[breaking\]' || true)
    if [ -z "$IN_COMMIT_MESSAGE" ]; then
        echo "$ERROR_MENTION_BREAKING_CHANGE"
        exit $ERR_CODE_BAD_COMMIT
    fi
}

FBSOURCE_ROOT="$(hg root)"

# shellcheck source=xplat/js/env-utils/setup_env_base.sh
source "$FBSOURCE_ROOT/xplat/js/env-utils/setup_env_base.sh"

# Path to a version of clang and clang-format, these should be from a consistent version
CLANG_PATH=$( \
    buck2 targets --console=none --show-output fbcode//third-party-buck/platform010/build/llvm-fb/19:bin/clang \
    | awk '{print $2}' \
    | xargs dirname \
)
export PATH="$FBSOURCE_ROOT/$CLANG_PATH:$PATH"

function cleanup() {
    # shellcheck disable=SC2317
    popd
}

pushd "$FBSOURCE_ROOT/xplat/js/react-native-github" || exit $ERR_CODE_CANT_FIND_PROJECT
trap cleanup EXIT

# TODO: This operates in the sandbox and can't modify files in the repository, which we need for change detection
# buck2 run //xplat/js/react-native-github/tools/api:public-api
(cd tools/api && $YARN_BINARY install)
$NODE_BINARY tools/api/public-api.js
echo

API_FILE=$(grep -oP '(?<=output=)[^ \n]+' tools/api/public-api.conf)

API_STATUS=$(hg status --no-status "$API_FILE")
if [ -z "$API_STATUS" ]; then
    echo "🎉 No public API changes, happy days!"
    exit 0
else
    echo "$WARNING_MESSAGE_HEADER"

    # Add any checks before showing the default warning
    check_if_mentions_breaking_change

    echo "$WARNING_MESSAGE_TAIL"
    exit $ERR_CODE_UNCOMMITTED_API_CHANGE
fi