#!/usr/bin/env bash
# Regression harness for ci-queue-wait.sh's zero-status-context handling.
#
# Gitea's combined-status endpoint returns, for a commit with NO status
# contexts (e.g. a repo with no CI configured at all):
#     {"state":"pending","sha":"...","total_count":0,"statuses":null,...}
# -- statuses is JSON null (not []), and state is a synthetic "pending"
# even though nothing is running. Captured live from a Gitea 1.22 host,
# 2026-08-09, on a Gitea-hosted repo with no pipeline configured.
#
# Before the fix, `payload.get("statuses", [])` received null, failed the
# isinstance(list) check, and the guard reported ASSERTED_NOT_READY
# state=malformed (exit 3) -- blocking every push to a CI-less repo. Had
# null been tolerated, the synthetic aggregate "pending" would instead
# have polled to the timeout (exit 124). The fix must:
#   1. treat statuses:null as an empty list, and
#   2. classify zero status VALUES as "no-status" regardless of the
#      synthetic aggregate state, and
#   3. treat no-status for --purpose push (without --require-status) as
#      queue-clear (exit 0) -- a repo with no CI has no queue to wait on;
#      this mirrors record_cannot_assert's disposition table
#      (push=degraded-pass, merge=hold).
#
# Covers:
#   (a) statuses:null + synthetic state:pending, purpose=push
#         -> exit 0, queue-clear/no-status message (THE live fault).
#   (b) same payload, purpose=merge      -> still fail-closed (exit 3).
#   (c) same payload, push + --require-status -> still fail-closed (exit 3).
#   (d) statuses:[]  + state:""          -> same as (a) (exit 0).
#   (e) a real pending context           -> still polls (times out, 124),
#       proving the relaxation didn't swallow genuine pending states.

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
WORK_DIR="${MOSAIC_TEST_WORK_DIR:-$PWD/.mosaic-test-work/ci-queue-wait-no-status}"
REPO_DIR="$WORK_DIR/repo"
STUB_DIR="$WORK_DIR/stubs"

rm -rf "$WORK_DIR"
mkdir -p "$REPO_DIR" "$STUB_DIR"

git -C "$REPO_DIR" init -q
git -C "$REPO_DIR" remote add origin https://git.example.test/acme/widgets.git

# Minimal curl stub (same conventions as test-ci-queue-wait-branch-absent.sh):
# branch lookup answers 200 with a fixed SHA; the status endpoint's payload
# is selected by MOSAIC_STUB_STATUS_MODE.
cat > "$STUB_DIR/curl" <<'SH'
#!/usr/bin/env bash
set -euo pipefail

has_w=0
url=""
for arg in "$@"; do
    case "$arg" in
        -w) has_w=1 ;;
        http://*|https://*) url="$arg" ;;
    esac
done

case "$url" in
    */branches/*)
        body='{"commit":{"id":"deadbeefcafef00d0123456789abcdef01234567"}}'
        if [[ "$has_w" == 1 ]]; then
            printf '%s\n200' "$body"
        else
            printf '%s' "$body"
        fi
        exit 0
        ;;
    */status)
        mode="${MOSAIC_STUB_STATUS_MODE:?MOSAIC_STUB_STATUS_MODE not set}"
        ;;
    *)
        echo "curl stub: unrecognized URL: $url" >&2
        exit 2
        ;;
esac

case "$mode" in
    # Verbatim shape of the live Gitea response (repository object elided).
    gitea-null-statuses)
        body='{"state":"pending","sha":"deadbeefcafef00d0123456789abcdef01234567","total_count":0,"statuses":null,"url":"","commit_url":""}'
        ;;
    empty-statuses)
        body='{"state":"","statuses":[]}'
        ;;
    real-pending)
        body='{"state":"pending","statuses":[{"context":"ci/woodpecker","status":"running","target_url":""}]}'
        ;;
    *)
        echo "curl stub: unknown mode=$mode" >&2
        exit 2
        ;;
esac
printf '%s' "$body"
SH
chmod +x "$STUB_DIR/curl"

run_ci_queue_wait() {
    (
        cd "$REPO_DIR"
        export PATH="$STUB_DIR:$PATH"
        export MOSAIC_CREDENTIALS_FILE="$WORK_DIR/no-credentials.json"
        export MOSAIC_CI_QUEUE_AUDIT_LOG="$WORK_DIR/audit.jsonl"
        export GITEA_TOKEN="stub-token"
        export GITEA_URL="https://git.example.test"
        "$SCRIPT_DIR/ci-queue-wait.sh" -B main -t 3 -i 1 "$@"
    )
}

fail=0

# (a) THE live fault: statuses:null + synthetic pending, purpose=push -> exit 0.
set +e
out_a=$(MOSAIC_STUB_STATUS_MODE=gitea-null-statuses run_ci_queue_wait --purpose push 2>&1)
status_a=$?
set -e
if [[ "$status_a" -ne 0 ]]; then
    echo "FAIL(a): expected exit 0 for null-statuses/no-CI repo on push, got $status_a" >&2
    echo "$out_a" >&2
    fail=1
elif [[ "$out_a" == *"malformed"* ]]; then
    echo "FAIL(a): null statuses must not be classified as malformed" >&2
    echo "$out_a" >&2
    fail=1
elif [[ "$out_a" != *"no-status"* ]]; then
    echo "FAIL(a): expected a no-status/queue-clear message, got:" >&2
    echo "$out_a" >&2
    fail=1
fi

# (b) Same payload, purpose=merge -> hold, fail-closed exit 3.
set +e
out_b=$(MOSAIC_STUB_STATUS_MODE=gitea-null-statuses run_ci_queue_wait --purpose merge 2>&1)
status_b=$?
set -e
if [[ "$status_b" -ne 3 ]]; then
    echo "FAIL(b): expected exit 3 for no-status on merge, got $status_b" >&2
    echo "$out_b" >&2
    fail=1
fi

# (c) Same payload, push + --require-status -> strictness opt-in still fails.
set +e
out_c=$(MOSAIC_STUB_STATUS_MODE=gitea-null-statuses run_ci_queue_wait --purpose push --require-status 2>&1)
status_c=$?
set -e
if [[ "$status_c" -ne 3 ]]; then
    echo "FAIL(c): expected exit 3 for --require-status with no contexts, got $status_c" >&2
    echo "$out_c" >&2
    fail=1
fi

# (d) statuses:[] + state:"" (the shape the code always tolerated) -> exit 0 on push.
set +e
out_d=$(MOSAIC_STUB_STATUS_MODE=empty-statuses run_ci_queue_wait --purpose push 2>&1)
status_d=$?
set -e
if [[ "$status_d" -ne 0 ]]; then
    echo "FAIL(d): expected exit 0 for empty-statuses on push, got $status_d" >&2
    echo "$out_d" >&2
    fail=1
fi

# (e) A REAL pending context must still block: polls to timeout, exit 124.
set +e
out_e=$(MOSAIC_STUB_STATUS_MODE=real-pending run_ci_queue_wait --purpose push 2>&1)
status_e=$?
set -e
if [[ "$status_e" -ne 124 ]]; then
    echo "FAIL(e): expected exit 124 (timeout) for a genuinely pending context, got $status_e" >&2
    echo "$out_e" >&2
    fail=1
elif [[ "$out_e" != *"ci/woodpecker=running"* ]]; then
    echo "FAIL(e): expected the pending context to be reported, got:" >&2
    echo "$out_e" >&2
    fail=1
fi

if [[ "$fail" -eq 0 ]]; then
    echo "ci-queue-wait no-status regression passed (5/5 cases)"
fi

exit "$fail"
