#!/bin/sh
#

test_description='git rebase --trailer integration tests
We verify that --trailer on the merge/interactive/exec/root backends,
and that it is rejected early when the apply backend is requested.'

GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME

. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-rebase.sh # test_commit_message, helpers

create_expect() {
	cat >"$1" <<-EOF
		$2

		Reviewed-by: Dev <dev@example.com>
	EOF
}

test_expect_success 'setup repo with a small history' '
	git commit --allow-empty -m "Initial empty commit" &&
	test_commit first file a &&
	test_commit second file &&
	git checkout -b conflict-branch first &&
	test_commit file-2 file-2 &&
	test_commit conflict file &&
	test_commit third file &&
	ident="$GIT_COMMITTER_NAME <$GIT_COMMITTER_EMAIL>" &&
	create_expect initial-signed  "Initial empty commit" &&
	create_expect first-signed    "first"                 &&
	create_expect second-signed   "second"                &&
	create_expect file2-signed    "file-2"                &&
	create_expect third-signed    "third"                 &&
	create_expect conflict-signed "conflict"
'

test_expect_success 'apply backend is rejected with --trailer' '
	git reset --hard third &&
	head_before=$(git rev-parse HEAD) &&
    test_expect_code 128 \
		git rebase --apply --trailer "Reviewed-by: Dev <dev@example.com>" \
			HEAD^ 2>err &&
	test_grep "requires the merge backend" err &&
	test_cmp_rev HEAD $head_before
'

test_expect_success 'reject empty --trailer argument' '
	git reset --hard third &&
	test_expect_code 128 git rebase -m --trailer "" HEAD^ 2>err &&
	test_grep "empty --trailer" err
'

test_expect_success 'reject trailer with missing key before separator' '
	git reset --hard third &&
	test_expect_code 128 git rebase -m --trailer ": no-key" HEAD^ 2>err &&
	test_grep "missing key before separator" err
'

test_expect_success 'CLI trailer duplicates allowed; replace policy keeps last' '
	git reset --hard third &&
	git -c trailer.Bug.ifexists=replace -c trailer.Bug.ifmissing=add rebase -m --trailer "Bug: 123" --trailer "Bug: 456" HEAD~1 &&
	git cat-file commit HEAD | grep "^Bug: 456" &&
	git cat-file commit HEAD | grep -v "^Bug: 123"
'

test_expect_success 'multiple Signed-off-by trailers all preserved' '
	git reset --hard third &&
	git rebase -m \
	    --trailer "Signed-off-by: Dev A <a@ex.com>" \
	    --trailer "Signed-off-by: Dev B <b@ex.com>" HEAD~1 &&
	git cat-file commit HEAD | grep -c "^Signed-off-by:" >count &&
	test "$(cat count)" = 2   # two new commits
'

test_expect_success 'rebase -m --trailer adds trailer after conflicts' '
	git reset --hard third &&
	test_must_fail git rebase -m \
		--trailer "Reviewed-by: Dev <dev@example.com>" \
		second third &&
	git checkout --theirs file &&
	git add file &&
    git rebase --continue &&
	test_commit_message HEAD~2 file2-signed
'

test_expect_success 'rebase --root --trailer updates every commit' '
	git checkout first &&
	git rebase --root --keep-empty \
		--trailer "Reviewed-by: Dev <dev@example.com>" &&
	test_commit_message HEAD   first-signed &&
	test_commit_message HEAD^  initial-signed
'
test_done