#!/usr/bin/env bash
# The pipeline's last step, run however the steps before it ended (if:
# always()). Settles the step list with how the run ended and sends it one
# last time:
#   * a step still running never finished, so it failed;
#   * a step that never started was skipped;
#   * when nothing closed the build record (a step died without fail_build:
#     Set up Node.js, a crash), close it as failed, naming the step, so the hub
#     does not show the run as running until it goes stale.
# Never fails: the run's result is already decided.
set -uo pipefail
. "$(dirname "$0")/lib.sh"

settle() {
  local f before stopped reason
  f="$(steps_file)"
  [ -s "$f" ] && command -v jq >/dev/null || return 0
  before="$(cat "$f")"

  # Why the run stopped, from the step that stopped it: one still running
  # (never finished), else the first that failed, else the first that never
  # started (it died before it could say so).
  stopped="$(jq -r '
    (map(select(.status == "running"))[0] | select(.) | .name + " did not finish.")
    // (map(select(.status == "failed"))[0] | select(.) | .name + (if .summary then ": " + .summary else " failed." end))
    // (map(select(.status == "pending"))[0] | select(.) | "The run stopped before " + .name + ".")
    // empty' "$f")"

  _steps_edit 'map(if .status == "running" then .status = "failed"
                   elif .status == "pending" then .status = "skipped" else . end)' || return 0
  # A step that was running when the run stopped gets its finish time too.
  _steps_edit --arg at "$(iso_now)" --argjson ms "$(now_ms)" \
    'map(if .status == "failed" and .startedMs and (.finishedAt | not)
         then .finishedAt = $at | .durationMs = ($ms - .startedMs) else . end)' || return 0

  if [ -n "${BUILD_ID:-}" ] && [ ! -e "$f.finished" ]; then
    reason="${stopped:-The run stopped before it finished.}"
    report_build_finish failed "$reason"
  fi
  [ "$(cat "$f")" = "$before" ] || steps_post
}

( settle ) || true
exit 0