#!/usr/bin/env bash

set -e

SCRIPTDIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "${SCRIPTDIR}/.validate"

tidy_files=('vendor.mod' 'vendor.sum')
vendor_files=("${tidy_files[@]}" 'vendor/')

validate_vendor_tidy() {
	# run mod tidy
	./hack/vendor.sh tidy
	# check if any files have changed
	git diff --quiet HEAD -- "${tidy_files[@]}"
}

validate_vendor_diff() {
	mapfile -t changed_files < <(validate_diff --diff-filter=ACMR --name-only -- "${vendor_files[@]}")

	if [ -n "${TEST_FORCE_VALIDATE:-}" ] || [ "${#changed_files[@]}" -gt 0 ]; then
		# recreate vendor/
		./hack/vendor.sh vendor
		# check if any files have changed
		git diff --quiet HEAD -- "${vendor_files[@]}"
	else
		echo >&2 'INFO: no vendor changes in diff; skipping vendor check.'
	fi
}

validate_vendor_license() {
	while IFS= read -r module; do
		test -d "vendor/$module" || continue
		if ! compgen -G "vendor/$module/*" | grep -qEi '/(LICENSE|COPYING)[^/]*$'; then
			echo >&2 "WARNING: could not find copyright information for $module"
		fi
	done < <(awk '/^# /{ print $2 }' vendor/modules.txt)
}

if validate_vendor_tidy && validate_vendor_diff && validate_vendor_license; then
	echo >&2 'PASS: Vendoring has been performed correctly!'
else
	{
		echo 'FAIL: Vendoring was not performed correctly!'
		echo
		echo 'The following files changed during re-vendor:'
		echo
		git diff --name-status HEAD -- "${vendor_files[@]}"
		echo
		echo 'Please revendor with hack/vendor.sh'
		echo
		git diff --diff-filter=M -- "${vendor_files[@]}"
	} >&2
	exit 1
fi