#!/usr/bin/env bash
set -euo pipefail

# The composite action's executable boundary (#218). Keeping the gather here
# lets the offline contract test replace the forge and prove that failed and
# partial reads cannot accidentally produce a green verdict.
#
# THE GATHER IS REST, THROUGH THE SHIM (#199). It was a single GraphQL query
# issued through `gh`, asking GitHub for `closingIssuesReferences` — its own
# parse of the closing keywords. Forgejo serves no GraphQL surface at all:
# `/api/graphql` 404s on this instance, and a real forgejo-runner job arrives
# with GITHUB_GRAPHQL_URL set to the empty string (lib/forge.sh's header).
# There was nothing to translate it to, so it is re-expressed — exactly as
# #188 re-expressed its own two GraphQL sites — over two reads both backends
# already serve, plus a parser this repo owns.
#
# WHAT THE GRAPH GAVE THAT TWO READS MUST REPLACE. This file used to call the
# graph "authoritative because it includes both closing keywords and sidebar
# links". Those two halves resolve differently here:
#
#   sidebar links    Forgejo has no such concept — an issue is closed by a
#                    keyword, never by a manual link. Nothing is lost.
#   commit messages  Forgejo DOES honour closing keywords in commit messages.
#                    A body-only parse would miss a PR that closes an issue
#                    from a commit subject and let through exactly the
#                    contradiction this action exists to catch.
#
# Hence both reads, unioned. The commit half is not optional.
# shellcheck source=lib/forge.sh
. "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/../../lib/forge.sh"
# shellcheck source=lib/issue_references.sh
. "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/../../lib/issue_references.sh"
# shellcheck source=lib/closes_references.sh
. "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/../../lib/closes_references.sh"

# No CEREMONY_FORGE_CLIENT declaration any more (#199 removes #198's): this
# file speaks the shim, not a client. Fail CLOSED at the action boundary all
# the same — "this action cannot produce a verdict" is the ACTION's contract
# and stays a refusal, while "this check should not block the board" is the
# CALLER's decision (@codex-reviewer-andresmgsl, #198).
forge_preflight || exit 1
forge_select "" || exit 1

REPO="${REPO:-${GITHUB_REPOSITORY:-}}"
[ -n "$REPO" ] || {
  echo "refs-not-closing: set REPO or GITHUB_REPOSITORY to owner/name" >&2
  exit 1
}
[ -n "${PR_NUMBER:-}" ] || {
  echo "refs-not-closing: pull request number is unavailable" >&2
  exit 1
}

body_file="$(mktemp)"
closing_file="$(mktemp)"
trap 'rm -f "$body_file" "$closing_file"' EXIT

# A read that fails must never reach the parser: an empty body parses to an
# empty closing set, which is a PASSING verdict this action never earned.
# `set -e` covers the assignment, and the explicit checks below name which
# read failed rather than leaving the operator to guess.
if ! forge_api "repos/$REPO/pulls/$PR_NUMBER" --jq '.body // ""' >"$body_file"; then
  echo "refs-not-closing: could not read PR $PR_NUMBER's body — refusing a verdict" >&2
  exit 1
fi

# --paginate carries the completeness proof: the forgejo backend walks pages
# and then compares what it collected against the server's declared
# x-total-count, refusing a short gather (#188, #4699). That IS this action's
# `hasNextPage` refusal, relocated rather than reinvented — upstream refused
# past 100 closing references rather than issue a partial verdict, and an
# incomplete commit read is the same failure wearing REST's clothes.
commits_file="$(mktemp)"
trap 'rm -f "$body_file" "$closing_file" "$commits_file"' EXIT
if ! forge_api --paginate "repos/$REPO/pulls/$PR_NUMBER/commits" \
  --jq '.[].commit.message' >"$commits_file"; then
  echo "refs-not-closing: could not read PR $PR_NUMBER's commits completely — refusing a partial verdict" >&2
  exit 1
fi

# The union. closes_references is line-oriented, so concatenating the body and
# every commit message and parsing once IS the union of parsing each — and it
# keeps one parse to reason about instead of two that could drift.
cat "$body_file" "$commits_file" | closes_references >"$closing_file"

mapfile -t closing_issues <"$closing_file"
bash "$GITHUB_ACTION_PATH/refs-not-closing.sh" \
  "$body_file" "${closing_issues[@]}"