#!/usr/bin/env bash

# Copyright The OpenTelemetry Authors
# SPDX-License-Identifier: Apache-2.0

set -eo pipefail

if [[ ! -w "$(pwd)/sdk/src/version/version.cc"  && ! -w "$(pwd)/api/include/opentelemetry/version.h" ]]; then
    echo "Error: Version file(s) are not writable. Check permissions and try again."
    exit 1
fi

# format: "v<MAJOR>.<MINOR>.<PATCH>-<PRERELEASE>+<BUILDMETADATA>-<NUMBER_OF_NEW_COMMITS>-g<LAST_COMMIT_HASH>""
semver_regex="^v(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)(\\-([0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*))?(\\+[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?-([0-9]+)-g([0-9|a-z]+)$"
git_tag=$(git describe --tags --long 2>/dev/null) || true
if [[ ! -z $git_tag ]] && [[ $git_tag =~ $semver_regex ]]; then
    major="${BASH_REMATCH[1]}"
    minor="${BASH_REMATCH[2]}"
    patch="${BASH_REMATCH[3]}"
    pre_release="${BASH_REMATCH[5]}" #optional
    build_metadata="${BASH_REMATCH[7]}" #optional
    count_new_commits="${BASH_REMATCH[9]}"
    latest_commit_hash="${BASH_REMATCH[10]}"
    if [[ -z ${major} ]] || [[ -z ${minor} ]] || [[ -z ${patch} ]] || [[ -z ${count_new_commits} ]] || [[ -z ${latest_commit_hash} ]]; then
        echo "Error: Incorrect tag format recevived. Exiting.."
        exit 1
    fi
else
    major=0 && minor=0 && patch=0 && pre_release="" && build_metadata="" && count_new_commits=0
    latest_commit_hash="$(git rev-parse --short HEAD)"
fi
: ${pre_release:="NONE"} # use default string if not defined
: ${build_metadata:="NONE"} # use default string if not defined
latest_commit_hash=$(git rev-parse ${latest_commit_hash}) # get full hash from short

if [[ -z ${latest_commit_hash} ]]; then
    echo "Error: Incorrect short hash received. Exiting.."
    exit 1
fi

branch="$(git rev-parse --abbrev-ref HEAD)"
short_version="${major}.${minor}.${patch}"
full_version="${short_version}-${pre_release}-${build_metadata}-${count_new_commits}-${branch}-${latest_commit_hash}"

# Update api version.h
sed -i "/^\#define OPENTELEMETRY_VERSION/c\#define OPENTELEMETRY_VERSION \"${short_version}\""  "$(pwd)/api/include/opentelemetry/version.h"
git add "$(pwd)/api/include/opentelemetry/version.h"

# Update sdk version.cc
cat > "$(pwd)/sdk/src/version/version.cc" <<END
// Please DONOT touch this file.
// Any changes done here would be overwritten by pre-commit git hook

#include "opentelemetry/sdk/version/version.h"

OPENTELEMETRY_BEGIN_NAMESPACE
namespace sdk
{
namespace version
{
    const int MAJOR_VERSION = ${major};
    const int MINOR_VERSION = ${minor};
    const int PATCH_VERSION = ${patch};
    const char* PRE_RELEASE = "${pre_release}";
    const char* BUILD_METADATA = "${build_metadata}";
    const int COUNT_NEW_COMMITS = ${count_new_commits};
    const char* BRANCH = "${branch}";
    const char* COMMIT_HASH = "${latest_commit_hash}";
    const char* SHORT_VERSION = "${short_version}";
    const char* FULL_VERSION = "${full_version}";
    const char* BUILD_DATE = "$(date -u)";
}
}
OPENTELEMETRY_END_NAMESPACE
END
git add "$(pwd)/sdk/src/version/version.cc"

# Update documentation version
sed -i "/^release =/crelease = \"${short_version}\""  "$(pwd)/docs/public/conf.py"
git add "$(pwd)/docs/public/conf.py"