#!/usr/bin/env bash
# gstack-timeline-log — append a timeline event to the project timeline
# Usage: gstack-timeline-log '{"skill":"review","event":"started","branch":"main"}'
#
# Session timeline: local-only, never sent anywhere.
# Required fields: skill, event (started|completed).
# Optional: branch, outcome, duration_s, session, ts.
# Validation failure → skip silently (non-blocking).
set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
eval "$("$SCRIPT_DIR/gstack-slug" 2>/dev/null)"
GSTACK_HOME="${GSTACK_HOME:-$HOME/.gstack}"
mkdir -p "$GSTACK_HOME/projects/$SLUG"

INPUT="$1"

# Validate: input must be parseable JSON with required fields
if ! printf '%s' "$INPUT" | bun -e "
  const j = JSON.parse(await Bun.stdin.text());
  if (!j.skill || !j.event) process.exit(1);
" 2>/dev/null; then
  exit 0  # skip silently, non-blocking
fi

# Inject timestamp if not present
if ! printf '%s' "$INPUT" | bun -e "const j=JSON.parse(await Bun.stdin.text()); if(!j.ts) process.exit(1)" 2>/dev/null; then
  INPUT=$(printf '%s' "$INPUT" | bun -e "
    const j = JSON.parse(await Bun.stdin.text());
    j.ts = new Date().toISOString();
    console.log(JSON.stringify(j));
  " 2>/dev/null) || true
fi

echo "$INPUT" >> "$GSTACK_HOME/projects/$SLUG/timeline.jsonl"

# Activity index: write to weekly rollup file for cross-runtime diarization
# Only log "completed" events to the activity index (not "started")
EVENT_TYPE=$(printf '%s' "$INPUT" | bun -e "const j=JSON.parse(await Bun.stdin.text()); console.log(j.event||'')" 2>/dev/null) || true
if [ "$EVENT_TYPE" = "completed" ]; then
  ACTIVITY_DIR="$GSTACK_HOME/activity"
  mkdir -p "$ACTIVITY_DIR"
  # ISO week number: YYYY-WNN
  WEEK_FILE="$ACTIVITY_DIR/activity-$(date +%G-W%V).jsonl"
  echo "$INPUT" >> "$WEEK_FILE"
fi