#!/usr/bin/env bash
# gstack-community-benchmarks — compare your stats to the community
#
# Fetches community benchmarks and compares against local analytics.
# Shows side-by-side: your average vs community median per skill.
#
# Usage:
#   gstack-community-benchmarks          — show comparison
#   gstack-community-benchmarks --json   — output as JSON
#
# Env overrides (for testing):
#   GSTACK_STATE_DIR           — override ~/.gstack state directory
#   GSTACK_DIR                 — override auto-detected gstack root
set -uo pipefail

GSTACK_DIR="${GSTACK_DIR:-$(cd "$(dirname "$0")/.." && pwd)}"
STATE_DIR="${GSTACK_STATE_DIR:-$HOME/.gstack}"
ANALYTICS_DIR="$STATE_DIR/analytics"
JSONL_FILE="$ANALYTICS_DIR/skill-usage.jsonl"

# Source Supabase config
if [ -f "$GSTACK_DIR/supabase/config.sh" ]; then
  . "$GSTACK_DIR/supabase/config.sh"
fi
SUPABASE_URL="${GSTACK_SUPABASE_URL:-}"
ANON_KEY="${GSTACK_SUPABASE_ANON_KEY:-}"
ENDPOINT="${GSTACK_TELEMETRY_ENDPOINT:-}"

JSON_MODE=false
[ "${1:-}" = "--json" ] && JSON_MODE=true

# ─── Fetch community benchmarks ─────────────────────────────
echo "gstack benchmarks"
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo ""

BENCHMARKS=""
if [ -n "$SUPABASE_URL" ] && [ -n "$ANON_KEY" ]; then
  # Try edge function first
  BENCHMARKS="$(curl -sf --max-time 10 \
    "${SUPABASE_URL}/functions/v1/community-benchmarks" \
    -H "Authorization: Bearer ${ANON_KEY}" \
    2>/dev/null || true)"

  # Fall back to direct table query
  if [ -z "$BENCHMARKS" ] || [ "$BENCHMARKS" = "[]" ]; then
    BENCHMARKS="$(curl -sf --max-time 10 \
      "${ENDPOINT}/community_benchmarks?select=skill,median_duration_s,total_runs,success_rate&order=total_runs.desc&limit=15" \
      -H "apikey: ${ANON_KEY}" \
      -H "Authorization: Bearer ${ANON_KEY}" \
      2>/dev/null || echo "[]")"
  fi
fi

# ─── Compute local stats ────────────────────────────────────
if [ ! -f "$JSONL_FILE" ]; then
  echo "No local analytics data. Use gstack skills to generate data."
  exit 0
fi

# Compute per-skill average duration from local JSONL
# Extract skill and duration, filter out nulls
echo "  Skill              You (avg)    Community     vs."
echo "  ─────────────────  ─────────    ──────────    ────────"

# Get unique skills from local data
LOCAL_SKILLS="$(grep -o '"skill":"[^"]*"' "$JSONL_FILE" 2>/dev/null | awk -F'"' '{print $4}' | sort -u)"

while IFS= read -r SKILL; do
  [ -z "$SKILL" ] && continue
  # Skip internal/meta skills
  case "$SKILL" in _*|test-*) continue ;; esac

  # Local: average duration in seconds
  LOCAL_AVG="$(grep "\"skill\":\"${SKILL}\"" "$JSONL_FILE" 2>/dev/null | \
    grep -o '"duration_s":[0-9]*' | awk -F: '{sum+=$2; n++} END {if(n>0) printf "%.0f", sum/n; else print "0"}')"

  LOCAL_COUNT="$(grep -c "\"skill\":\"${SKILL}\"" "$JSONL_FILE" 2>/dev/null || echo "0")"

  # Format duration
  if [ "$LOCAL_AVG" -ge 60 ] 2>/dev/null; then
    LOCAL_FMT="$(( LOCAL_AVG / 60 ))m $(( LOCAL_AVG % 60 ))s"
  else
    LOCAL_FMT="${LOCAL_AVG:-0}s"
  fi

  # Community: find matching skill in benchmarks
  COMM_MEDIAN=""
  COMM_FMT="--"
  DELTA=""
  if [ -n "$BENCHMARKS" ] && [ "$BENCHMARKS" != "[]" ]; then
    COMM_MEDIAN="$(echo "$BENCHMARKS" | grep -o "\"skill\":\"${SKILL}\"[^}]*\"median_duration_s\":[0-9.]*" | \
      grep -o '"median_duration_s":[0-9.]*' | head -1 | awk -F: '{printf "%.0f", $2}')"

    if [ -n "$COMM_MEDIAN" ] && [ "$COMM_MEDIAN" -gt 0 ] 2>/dev/null; then
      if [ "$COMM_MEDIAN" -ge 60 ] 2>/dev/null; then
        COMM_FMT="$(( COMM_MEDIAN / 60 ))m $(( COMM_MEDIAN % 60 ))s"
      else
        COMM_FMT="${COMM_MEDIAN}s"
      fi

      # Compute delta percentage
      if [ "$LOCAL_AVG" -gt 0 ] 2>/dev/null && [ "$COMM_MEDIAN" -gt 0 ] 2>/dev/null; then
        DIFF=$(( (LOCAL_AVG - COMM_MEDIAN) * 100 / COMM_MEDIAN ))
        if [ "$DIFF" -gt 5 ] 2>/dev/null; then
          DELTA="+${DIFF}% slower"
        elif [ "$DIFF" -lt -5 ] 2>/dev/null; then
          DELTA="$(( -DIFF ))% faster"
        else
          DELTA="~same"
        fi
      fi
    fi
  fi

  printf "  /%-17s  %-10s   %-12s  %s\n" "$SKILL" "$LOCAL_FMT" "$COMM_FMT" "${DELTA:-}"

done <<< "$LOCAL_SKILLS"

echo ""
echo "Your runs: $(wc -l < "$JSONL_FILE" | tr -d ' ') total events"
echo "Community benchmarks refresh hourly."