#!/bin/sh
set -eu

script_dir=$(CDPATH= cd "$(dirname "$0")" && pwd -P)
# shellcheck source=release-lib.sh
. "$script_dir/release-lib.sh"

tool_name=release

if [ "$#" -ne 1 ]; then
	narratio_release_fail "$tool_name" 'usage: scripts/release.sh VERSION'
fi

release_version=$1
if ! narratio_release_validate_version "$release_version"; then
	narratio_release_fail "$tool_name" "invalid stable version: $release_version"
fi

repo_root=$(narratio_release_repo_root "$0") || narratio_release_fail "$tool_name" 'cannot locate repository root'
if ! cd "$repo_root"; then
	narratio_release_fail "$tool_name" "cannot enter repository root: $repo_root"
fi

narratio_release_require_main_branch() {
	current_branch=$(git branch --show-current) || narratio_release_fail "$tool_name" 'cannot determine current branch'
	if [ "$current_branch" != main ]; then
		narratio_release_fail "$tool_name" 'release checkout must be on main'
	fi
}

narratio_release_require_clean_checkout() {
	if [ -n "$(git status --porcelain)" ]; then
		narratio_release_fail "$tool_name" 'release checkout must be clean'
	fi
}

narratio_release_fetch_origin() {
	if ! git fetch origin main --tags; then
		narratio_release_fail "$tool_name" 'failed to fetch origin main and tags'
	fi
}

narratio_release_require_no_local_tag() {
	if git show-ref --verify --quiet "refs/tags/$release_version"; then
		narratio_release_fail "$tool_name" "local tag already exists: $release_version"
	fi
}

narratio_release_require_no_remote_tag() {
	if ! remote_tag=$(git ls-remote --tags origin "refs/tags/$release_version"); then
		narratio_release_fail "$tool_name" "cannot inspect tag at origin: $release_version"
	fi
	if [ -n "$remote_tag" ]; then
		narratio_release_fail "$tool_name" "upstream tag already exists: $release_version"
	fi
}

narratio_release_require_main_branch
narratio_release_require_clean_checkout
narratio_release_fetch_origin

candidate_commit=$(git rev-parse --verify 'HEAD^{commit}') || narratio_release_fail "$tool_name" 'cannot resolve HEAD commit'
upstream_commit=$(git rev-parse --verify 'origin/main^{commit}') || narratio_release_fail "$tool_name" 'cannot resolve origin/main commit'
if [ "$candidate_commit" != "$upstream_commit" ]; then
	narratio_release_fail "$tool_name" 'HEAD must equal origin/main before release validation'
fi
release_note="docs/releases/$release_version.md"
if ! git cat-file -e "$candidate_commit:$release_note"; then
	narratio_release_fail "$tool_name" "candidate commit is missing release note: $release_note"
fi
narratio_release_require_no_local_tag
narratio_release_require_no_remote_tag

if ! "$script_dir/check-release-candidate.sh" "$release_version"; then
	narratio_release_fail "$tool_name" 'release candidate validation failed'
fi

narratio_release_fetch_origin
narratio_release_require_main_branch
narratio_release_require_clean_checkout
current_commit=$(git rev-parse --verify 'HEAD^{commit}') || narratio_release_fail "$tool_name" 'cannot resolve HEAD commit after validation'
current_upstream_commit=$(git rev-parse --verify 'origin/main^{commit}') || narratio_release_fail "$tool_name" 'cannot resolve origin/main commit after validation'
if [ "$current_commit" != "$candidate_commit" ] || [ "$current_upstream_commit" != "$candidate_commit" ]; then
	narratio_release_fail "$tool_name" 'candidate or origin/main changed during release validation'
fi
narratio_release_require_no_local_tag
narratio_release_require_no_remote_tag

if ! git -c tag.gpgSign=false tag "$release_version" "$candidate_commit"; then
	narratio_release_fail "$tool_name" "cannot create local tag: $release_version"
fi
if [ "$(git cat-file -t "refs/tags/$release_version")" != commit ]; then
	narratio_release_fail "$tool_name" "local tag is not lightweight: $release_version"
fi
if [ "$(git rev-parse --verify "refs/tags/$release_version^{commit}")" != "$candidate_commit" ]; then
	narratio_release_fail "$tool_name" "local tag does not resolve to candidate commit: $release_version"
fi

if ! git push origin "refs/tags/$release_version:refs/tags/$release_version"; then
	printf 'release: local tag %s was created but not published; inspect it before retrying\n' "$release_version" >&2
	exit 1
fi
printf 'release: published %s at %s\n' "$release_version" "$candidate_commit"
exit 0