#!/usr/bin/env bash
# Build activity log (tool calls + reasoning) from the event stream into /tmp/activity_log.md.
# Only dev agents (mode=pr) get an activity-log comment — comment-only roles (pm/qa)
# do no tool calls, so a trail would be empty/noise.
#
# Required env (provided by the workflow step): MODE
set -u

if [ "$MODE" != "pr" ]; then
  echo "skipping activity log for comment-mode agent"; : > /tmp/activity_log.md; exit 0
fi
jq -r '
  def trunc(n): if length > n then (.[0:n] + "…") else . end;
  select(.type=="tool_use" or .type=="text") |
    if .type=="text" then
      # Drop the PR-description block from the reasoning trail — it is already published verbatim as
      # the PR description, so repeating it here is redundant noise. Skip a text part that is nothing
      # but that block (would otherwise be an empty "💬 " entry).
      ((.part.text // "")
       | gsub("BEGIN_PR_DESCRIPTION.*?END_PR_DESCRIPTION"; ""; "m")
       | gsub("\\A[[:space:]]+|[[:space:]]+\\z"; "")) as $t |
      if $t == "" then empty else "💬 " + ($t | trunc(4000)) end
    else
      (.part.tool // "?") as $t |
      ((.part.state.title // (.part.state.input | tojson | trunc(160)) // "")) as $title |
      "🔧 **" + $t + "**: `" + ($title | trunc(240)) + "`"
    end
' /tmp/events.jsonl > /tmp/activity_log.md 2>/dev/null || true
n=$(wc -l < /tmp/activity_log.md 2>/dev/null || echo 0)
echo "activity log: $n entries"
[ "$n" -eq 0 ] && : > /tmp/activity_log.md
head -3 /tmp/activity_log.md