#!/usr/bin/env bash
# Build the RUN REPORT appended to the agent's reply comment: the TOOL CALLS the agent made plus a
# usage line (input / output tokens + $ cost). Written to /tmp/activity_log.md; the Publish step
# appends it to the agent's reply. Applies to EVERY agent — @pm/@qa also call tools and cost money.
#
# opencode --format json emits one JSON event per line. `step_finish` events carry, per LLM step,
# .part.tokens {input, output, reasoning, cache:{read, write}} and .part.cost (USD, already computed
# by opencode from the model's pricing). We sum them across all steps of the run. Models without
# pricing (e.g. self-hosted ollama) report cost 0 — shown as $0.0000.
#
# Required env (provided by the workflow step): (none needed; reads /tmp/events.jsonl)
set -u
E=/tmp/events.jsonl
: > /tmp/activity_log.md
[ -s "$E" ] || { echo "no events — empty report"; exit 0; }

# Tool calls = the ACTIONS taken (not the agent's prose text parts).
jq -r '
  def trunc(n): if length > n then (.[0:n] + "…") else . end;
  select(.type=="tool_use") |
    (.part.tool // "?") as $t |
    ((.part.state.title // (.part.state.input | tojson | trunc(160)) // "")) as $title |
    "🔧 **" + $t + "**: `" + ($title | trunc(240)) + "`"
' "$E" > /tmp/tools.md 2>/dev/null || true
n=$(wc -l < /tmp/tools.md 2>/dev/null || echo 0); n=${n:-0}

# Usage: sum per-step tokens + cost across every step_finish event (tab-separated for `read`).
read -r COST INP OUT CR CW RE < <(jq -rs '
  [ .[] | select(.type=="step_finish") | .part ] as $s
  | [ ([$s[].cost // 0]|add // 0),
      ([$s[].tokens.input // 0]|add // 0),
      ([$s[].tokens.output // 0]|add // 0),
      ([$s[].tokens.cache.read // 0]|add // 0),
      ([$s[].tokens.cache.write // 0]|add // 0),
      ([$s[].tokens.reasoning // 0]|add // 0) ]
  | @tsv' "$E" 2>/dev/null)
COST=${COST:-0}; INP=${INP:-0}; OUT=${OUT:-0}; CR=${CR:-0}; CW=${CW:-0}; RE=${RE:-0}
IN_TOTAL=$(( INP + CR + CW ))                          # total input context processed
COSTF=$(awk -v c="$COST" 'BEGIN{printf "$%.4f", c+0}')
echo "usage: in=$IN_TOTAL out=$OUT cost=$COSTF (fresh=$INP cache_r=$CR cache_w=$CW reasoning=$RE); tools=$n"

{
  if [ "$n" -gt 0 ]; then
    printf '\n\n<details>\n<summary>🔧 %s tool calls · in %s · out %s · %s</summary>\n\n' "$n" "$IN_TOTAL" "$OUT" "$COSTF"
    cat /tmp/tools.md
    printf '\n\n<sub>tokens — input %s (fresh %s · cache %sw / %sr) · output %s · reasoning %s · **cost %s**</sub>\n</details>' \
      "$IN_TOTAL" "$INP" "$CW" "$CR" "$OUT" "$RE" "$COSTF"
  else
    printf '\n\n<sub>💰 **%s** · in %s · out %s tokens (cache %sw / %sr)</sub>' "$COSTF" "$IN_TOTAL" "$OUT" "$CW" "$CR"
  fi
} > /tmp/activity_log.md