#!/usr/bin/env bash
set -u -o pipefail

TEST_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
source "${TEST_ROOT}/tests/testlib.sh"
source "${TEST_ROOT}/inc/git-update.inc"

TEST_TEMP_DIR="$(mktemp -d /tmp/tapm-git-tests.XXXXXX)"
TEST_REPOSITORY="${TEST_TEMP_DIR}/repository"

cleanup_git_tests() {
	if [[ "$TEST_TEMP_DIR" == /tmp/tapm-git-tests.* && -d "$TEST_TEMP_DIR" ]]; then
		rm -rf -- "$TEST_TEMP_DIR"
	fi
}
trap cleanup_git_tests EXIT

git init -q -b main "$TEST_REPOSITORY"
git -C "$TEST_REPOSITORY" config user.name 'TA-ProxMenu Tests'
git -C "$TEST_REPOSITORY" config user.email 'tapm-tests@example.invalid'

printf 'first\n' >"${TEST_REPOSITORY}/fixture.txt"
git -C "$TEST_REPOSITORY" add fixture.txt
git -C "$TEST_REPOSITORY" commit -q -m first
commit_a="$(git -C "$TEST_REPOSITORY" rev-parse HEAD)"

printf 'second\n' >>"${TEST_REPOSITORY}/fixture.txt"
git -C "$TEST_REPOSITORY" commit -q -am second
commit_b="$(git -C "$TEST_REPOSITORY" rev-parse HEAD)"

git -C "$TEST_REPOSITORY" switch -q --detach "$commit_a"
printf 'alternate\n' >"${TEST_REPOSITORY}/alternate.txt"
git -C "$TEST_REPOSITORY" add alternate.txt
git -C "$TEST_REPOSITORY" commit -q -m alternate
commit_c="$(git -C "$TEST_REPOSITORY" rev-parse HEAD)"

git -C "$TEST_REPOSITORY" update-ref refs/tapm/a "$commit_a"
git -C "$TEST_REPOSITORY" update-ref refs/tapm/b "$commit_b"
git -C "$TEST_REPOSITORY" update-ref refs/tapm/c "$commit_c"

assert_equal current \
	"$(TAPM_GIT_RELATION "$TEST_REPOSITORY" refs/tapm/a refs/tapm/a)" \
	"equal commits"
assert_equal behind \
	"$(TAPM_GIT_RELATION "$TEST_REPOSITORY" refs/tapm/a refs/tapm/b)" \
	"local commit behind remote"
assert_equal ahead \
	"$(TAPM_GIT_RELATION "$TEST_REPOSITORY" refs/tapm/b refs/tapm/a)" \
	"local commit ahead of remote"
assert_equal diverged \
	"$(TAPM_GIT_RELATION "$TEST_REPOSITORY" refs/tapm/b refs/tapm/c)" \
	"diverged commits"

git -C "$TEST_REPOSITORY" switch -q -C main "$commit_a"
git -C "$TEST_REPOSITORY" update-ref refs/remotes/origin/main "$commit_a"
assert_equal current \
	"$(TAPM_GIT_BRANCH_STATE "$TEST_REPOSITORY" main)" \
	"clean current branch"

printf 'untracked\n' >"${TEST_REPOSITORY}/untracked.txt"
assert_equal dirty \
	"$(TAPM_GIT_BRANCH_STATE "$TEST_REPOSITORY" main)" \
	"dirty working tree"
rm -f -- "${TEST_REPOSITORY}/untracked.txt"

git -C "$TEST_REPOSITORY" switch -q -c feature
assert_equal wrong-branch \
	"$(TAPM_GIT_BRANCH_STATE "$TEST_REPOSITORY" main)" \
	"wrong checked-out branch"

git -C "$TEST_REPOSITORY" switch -q main
git -C "$TEST_REPOSITORY" update-ref refs/remotes/origin/main "$commit_b"
assert_success "fast-forward merge" \
	TAPM_GIT_FAST_FORWARD "$TEST_REPOSITORY" main
assert_equal "$commit_b" \
	"$(git -C "$TEST_REPOSITORY" rev-parse HEAD)" \
	"fast-forward destination"

finish_tests