#!/usr/bin/env bash

set -euo pipefail

if [ "$#" -ne 2 ]; then

echo "usage: $0 <tag> <output-file>" >&2

exit 2

fi

tag="$1"

output_file="$2"

case "$tag" in

v[0-9]*.[0-9]*.[0-9]*)

version="${tag#v}"

base_version="${version%%-*}"

;;

*)

echo "release tag must use vX.Y.Z or vX.Y.Z-prerelease format: $tag" >&2

exit 1

;;

esac

declared_version="$(tr -d '[:space:]' < VERSION)"

if [ "$base_version" != "$declared_version" ]; then

echo "release tag $tag does not match VERSION $declared_version" >&2

exit 1

fi

if [ "$version" != "$base_version" ]; then

cat > "$output_file" <<EOF

Release candidate for \`v$base_version\`.

This prerelease is intended to validate release packaging and platform artifacts.

See the final \`v$base_version\` release for changelog notes.

EOF

exit 0

fi

awk -v version="$base_version" -v tag="$tag" '

$0 ~ "^## \\[" version "\\]" {

found = 1

first = 1

date = $0

sub("^## \\[" version "\\] - ", "", date)

print "## gitfleet@" tag " | " date

print ""

next

}

found && /^## \[/ {

exit

}

found {

if (first && $0 == "") {

first = 0

next

}

first = 0

print

}

END {

if (!found) {

exit 1

}

}

' CHANGELOG.md > "$output_file"

if [ ! -s "$output_file" ]; then

echo "CHANGELOG.md section for $version is empty or missing" >&2

exit 1

fi