#!/usr/bin/env bash
# Contract tests for actions/refs-not-closing (issue #218). Bodies and
# closing-reference sets are fixtures: no network and no pull request are
# involved. set -u, not -e: failures are behavior for the harness to inspect.
set -u

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
# shellcheck source=test/harness.sh
. "$ROOT/test/harness.sh"

SCRIPT="$ROOT/actions/refs-not-closing/refs-not-closing.sh"
ACTION="$ROOT/actions/refs-not-closing/action.yml"
ENTRYPOINT="$ROOT/actions/refs-not-closing/run.sh"
WORKFLOW="$ROOT/.github/workflows/refs-guard.yml"

TMP="$(mktemp -d)"
trap 'rm -rf "$TMP"' EXIT

body() {
  local name="$1"
  shift
  printf '%s\n' "$@" >"$TMP/$name.md"
}

guard() {
  local name="$1"
  shift
  bash "$SCRIPT" "$TMP/$name.md" "$@"
}

body ref-5 'Refs #5'
check "Refs target with empty closing set passes" 0 "no Refs target" guard ref-5
check "Refs target with itself closing fails" 1 "#5" guard ref-5 5
check "Refs target with another issue closing passes" 0 "no Refs target" guard ref-5 9

body ordinary 'Closes #5'
check "ordinary Closes PR remains green" 0 "no Refs target" guard ordinary 5

body mixed 'Refs #5' '' 'This PR legitimately Closes #9.'
check "Refs #5 plus Closes #9 remains green" 0 "no Refs target" guard mixed 9

body prose 'Refs #5' '' 'Triage closes #5 by hand after the live proof.'
check "closing prose for a Refs target fails" 1 "closes #5" guard prose 5
check "failure prints the surrounding sentence" 1 \
  "sentence: Triage closes #5 by hand after the live proof" guard prose 5
check "failure offers number-first rewrite" 1 "#N is" guard prose 5
check "failure offers number-free rewrite" 1 "closes the issue" guard prose 5

body code-span 'Refs #5' '' "The body must not contain \`Closes #5\` anywhere."
check "backticked closing keyword is reported as the match" 1 \
  "matched: Closes #5" guard code-span 5
check "backtick failure explains that code spans do not protect" 1 \
  "Backticks do not protect" guard code-span 5

body adjacency 'Refs #5' '' 'Triage closes #9 and #5 after the proof.'
check "non-adjacent #5 does not join closing set #9" 0 "no Refs target" \
  guard adjacency 9

body empty ''
check "empty body remains green" 0 "no Refs target" guard empty 5

body incidents-211 'Refs #209' 'Triage closes #209 by hand.'
check "#211 incident replays red" 1 "#209" guard incidents-211 209
body incidents-214 'Refs #212' 'Triage closes #212 and #209 on that evidence.'
check "#214 incident replays red" 1 "#212" guard incidents-214 212
body incidents-200 'Refs #199' "A later edit added \`Closes #199\`."
check "#200 incident replays red" 1 "#199" guard incidents-200 199

body multiple 'Refs #5 and Refs #7.' 'Triage closes #5 and fixes #7 by hand.'
check "failure names every intersecting issue" 1 \
  "scheduled to close: #5 #7" guard multiple 5 7

body soft-wrap 'Refs #5' '' 'Triage closes' '#5 by hand after the live proof.'
check "soft-wrapped closing prose is reported as one sentence" 1 \
  "sentence: Triage closes #5 by hand after the live proof" \
  guard soft-wrap 5

body refs-colon 'Refs: #5' '' 'Triage closes #5 after proof.'
check "Refs colon form is protected" 1 "matched: closes #5" \
  guard refs-colon 5
body refs-link 'Refs [#5](https://example.test/issues/5)' '' \
  'Triage closes #5 after proof.'
check "linked Refs form is protected" 1 "matched: closes #5" \
  guard refs-link 5

for number in 207 191 190 176 165 164; do
  body "incident-$number" "Refs #$number"
  check "#$number incident replays green" 0 "no Refs target" \
    guard "incident-$number"
done

check "missing body is a loud failure" 1 "missing or unreadable" \
  bash "$SCRIPT" "$TMP/missing.md"
check "invalid closing set is a loud failure" 1 "invalid closing issue" \
  guard ref-5 nope

# The action owns the network boundary. #199 made that boundary REST through
# the shim, so it is driven here on BOTH backends with stubs at the transport
# — a fake `gh api` for the github backend, a fake `curl` for the forgejo one.
# Stubbing the shim itself would prove only that the test can stub the shim.
mkdir -p "$TMP/bin"

# The fixture, one PR, expressed once and served by both stubs. The body
# REFERENCES #5 while a commit CLOSES it: the contradiction this action
# exists to catch, and the case a body-only port would miss (#199).
PR_BODY_DEFAULT='Refs #5'
COMMIT_MSG_DEFAULT='Closes #5

body text'

cat >"$TMP/bin/gh" <<'EOF'
#!/usr/bin/env bash
set -u
[ -z "${FORGE_CALL_LOG:-}" ] || printf '%s\n' "$*" >>"$FORGE_CALL_LOG"
endpoint=""; jqexpr=""
shift  # `api`
while [ $# -gt 0 ]; do
  case "$1" in
    --paginate) ;;
    --jq) jqexpr="$2"; shift ;;
    -*) ;;
    *) [ -n "$endpoint" ] || endpoint="$1" ;;
  esac
  shift
done
case "${FAKE_FORGE_MODE:-success}" in
  body-fails)    case "$endpoint" in */commits*) ;; *) echo "fake body read failed" >&2; exit 42 ;; esac ;;
  commits-fails) case "$endpoint" in */commits*) echo "fake commit read failed" >&2; exit 42 ;; esac ;;
esac
case "$endpoint" in
  */commits*) out="$(jq -nc --arg m "${FAKE_COMMIT_MSG:-}" '[{commit:{message:$m}}]')" ;;
  *)          out="$(jq -nc --arg b "${FAKE_PR_BODY:-}" '{body:$b}')" ;;
esac
if [ -n "$jqexpr" ]; then printf '%s' "$out" | jq -r "$jqexpr"; else printf '%s' "$out"; fi
EOF
chmod +x "$TMP/bin/gh"

# curl as the forgejo backend calls it: -D <headers> -o <body> <url>. The
# x-total-count header is what forge_api's completeness proof compares
# against, so `partial` here is a REAL short gather, not a flag the test
# invents (#188, #4699).
cat >"$TMP/bin/curl" <<'EOF'
#!/usr/bin/env bash
set -u
hdr=""; body=""; url=""
while [ $# -gt 0 ]; do
  case "$1" in
    -D) hdr="$2"; shift 2 ;;
    -o) body="$2"; shift 2 ;;
    -H) shift 2 ;;
    -sS|-s|-S) shift ;;
    *) url="$1"; shift ;;
  esac
done
[ -z "${FORGE_CALL_LOG:-}" ] || printf '%s\n' "$url" >>"$FORGE_CALL_LOG"
case "${FAKE_FORGE_MODE:-success}" in
  body-fails)    case "$url" in *"/commits"*) ;; *) echo "fake body read failed" >&2; exit 42 ;; esac ;;
  commits-fails) case "$url" in *"/commits"*) echo "fake commit read failed" >&2; exit 42 ;; esac ;;
esac
total=1
case "$url" in
  *"/commits"*)
    payload="$(jq -nc --arg m "${FAKE_COMMIT_MSG:-}" '[{commit:{message:$m}}]')"
    # `partial`: declare 9, serve 1 and then nothing. Serving the same item on
    # every page instead would NOT be a short gather — forge_api walks until a
    # short page, so a stub that never runs out lets it collect exactly the
    # declared total and pass honestly. The first draft of this stub did that
    # and the case passed while proving nothing.
    if [ "${FAKE_FORGE_MODE:-success}" = partial ]; then
      total=9
      grep -q 'page=1\b' <<<"$url" || payload='[]'
    fi
    ;;
  *) payload="$(jq -nc --arg b "${FAKE_PR_BODY:-}" '{body:$b}')" ;;
esac
printf 'HTTP/1.1 200 OK\r\nx-total-count: %s\r\n\r\n' "$total" >"$hdr"
printf '%s' "$payload" >"$body"
EOF
chmod +x "$TMP/bin/curl"

# boundary <forge> <mode> [body] [commit-message]
boundary() {
  local forge="$1" mode="$2"
  local body="${3-$PR_BODY_DEFAULT}" msg="${4-$COMMIT_MSG_DEFAULT}"
  env PATH="$TMP/bin:$PATH" \
    FAKE_FORGE_MODE="$mode" FAKE_PR_BODY="$body" FAKE_COMMIT_MSG="$msg" \
    CEREMONY_FORGE="$forge" \
    CEREMONY_FORGE_API="https://forge.example/api/v1" GH_TOKEN=tok \
    REPO="heavy-duty/ceremony" GITHUB_REPOSITORY="heavy-duty/ceremony" \
    PR_NUMBER=268 \
    GITHUB_ACTION_PATH="$ROOT/actions/refs-not-closing" \
    bash "$ENTRYPOINT"
}

# THE PORTABILITY CLAIM, driven rather than asserted: one fixture, both
# backends, same verdict. This is the acceptance criterion #199 states.
check "a Refs promise contradicted by a commit is caught — github backend" 1 \
  "#5" boundary github success
check "...and identically on the forgejo backend" 1 \
  "#5" boundary forgejo success

# The half a body-only port would miss: the keyword is ONLY in the commit.
check "a closing keyword only in a commit message is detected — github" 1 \
  "#5" boundary github success 'Refs #5' 'Closes #5'
check "...and on forgejo" 1 \
  "#5" boundary forgejo success 'Refs #5' 'Closes #5'
# ...and the same PR passes when nothing closes it, so the case above is
# detecting the keyword rather than just failing on every input.
check "a body that only references, with no closing keyword anywhere, passes" 0 \
  "" boundary forgejo success 'Refs #5' 'plain commit subject'

# A failed read must never reach the parser: an empty body parses to an empty
# closing set, which is a PASSING verdict the action never earned.
check "a failed body read refuses, non-zero — github" 1 \
  "refusing a verdict" boundary github body-fails
check "...and on forgejo" 1 "refusing a verdict" boundary forgejo body-fails
check "a failed commit read refuses, non-zero" 1 \
  "refusing a partial verdict" boundary github commits-fails

# The `hasNextPage` refusal, relocated (#199 spec 3): a short paginated gather
# is the REST equivalent, and the forgejo backend's x-total-count proof is
# what catches it. This is the case that would silently pass if the port had
# dropped --paginate.
check "an incomplete commit read refuses a partial verdict" 1 \
  "refusing a partial verdict" boundary forgejo partial

# Strip comments first. The entrypoint's prose NAMES gh, GraphQL and
# CEREMONY_FORGE_CLIENT to explain what it replaced, so a raw grep asserts on
# the explanation rather than the code — it passes with the call still there.
entrypoint_code() { sed 's/#.*//' "$ENTRYPOINT"; }
invokes_gh() { entrypoint_code | grep -qE '(^|[^[:alnum:]_])gh[[:space:]]'; }
holds_graphql() { entrypoint_code | grep -qi 'graphql'; }
declares_client() { entrypoint_code | grep -q 'CEREMONY_FORGE_CLIENT'; }
check "the entrypoint invokes no gh (#199)" 1 "" invokes_gh
check "...and holds no GraphQL" 1 "" holds_graphql
check "...and declares no forge client, because it speaks the shim" 1 "" declares_client
# The caller must SCHEDULE it now. A portable action behind a github-only gate
# is a guard that passes by never running (@kimi-reviewer-andresmgsl, #198).
check "the caller no longer gates the job on the forge" 1 "" \
  grep -F "github.server_url" "$ROOT/.github/workflows/refs-guard.yml"

check "composite delegates to the tested entrypoint" 0 "run.sh" \
  grep -F "run: bash \"\$GITHUB_ACTION_PATH/run.sh\"" "$ACTION"

check "workflow wakes on body edits" 0 "types: [opened, edited, reopened, synchronize]" \
  grep -F "types: [opened, edited, reopened, synchronize]" "$WORKFLOW"
check "workflow is pull_request-only" 1 "" \
  grep -E '^  (push|pull_request_target|workflow_dispatch|schedule|issue_comment):' \
  "$WORKFLOW"
check "workflow grants read-only pull request access" 0 "pull-requests: read" \
  grep -F "pull-requests: read" "$WORKFLOW"

summary