#!/usr/bin/env bash
# gstack-community-dashboard — community usage stats from Supabase
#
# Calls the community-pulse edge function for aggregated stats:
# skill popularity, crash clusters, version distribution, retention.
#
# Env overrides (for testing):
#   GSTACK_DIR                    — override auto-detected gstack root
#   GSTACK_SUPABASE_URL           — override Supabase project URL
#   GSTACK_SUPABASE_ANON_KEY      — override Supabase anon key
set -uo pipefail

GSTACK_DIR="${GSTACK_DIR:-$(cd "$(dirname "$0")/.." && pwd)}"

# Source Supabase config if not overridden by env
if [ -z "${GSTACK_SUPABASE_URL:-}" ] && [ -f "$GSTACK_DIR/supabase/config.sh" ]; then
  . "$GSTACK_DIR/supabase/config.sh"
fi
SUPABASE_URL="${GSTACK_SUPABASE_URL:-}"
ANON_KEY="${GSTACK_SUPABASE_ANON_KEY:-}"

if [ -z "$SUPABASE_URL" ] || [ -z "$ANON_KEY" ]; then
  echo "gstack community dashboard"
  echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
  echo ""
  echo "Supabase not configured yet. The community dashboard will be"
  echo "available once the gstack Supabase project is set up."
  echo ""
  echo "For local analytics, run: gstack-analytics"
  exit 0
fi

# ─── Fetch aggregated stats from edge function ────────────────
# HTTP status captured (#1947): a backend failure must read as "unknown",
# never as a healthy "Weekly active installs: 0".
TMPBODY="$(mktemp)"
trap 'rm -f "$TMPBODY"' EXIT
HTTP_CODE="$(curl -s --max-time 15 -w '%{http_code}' -o "$TMPBODY" \
  "${SUPABASE_URL}/functions/v1/community-pulse" \
  -H "apikey: ${ANON_KEY}" \
  2>/dev/null || true)"
# curl prints its own 000 before a non-zero exit — a `|| echo` here would
# double it to "000000" in user-facing output. Normalize to the last 3 chars.
HTTP_CODE="$(printf '%s' "$HTTP_CODE" | tr -d '[:space:]' | tail -c 3)"
[ -n "$HTTP_CODE" ] || HTTP_CODE="000"
DATA="$(cat "$TMPBODY" 2>/dev/null || echo "")"

echo "gstack community dashboard"
echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
echo ""

if [ "$HTTP_CODE" != "200" ] || [ -z "$DATA" ] || ! printf '%s' "$DATA" | grep -q '"weekly_active"'; then
  echo "Community stats: unknown — backend error (HTTP ${HTTP_CODE})"
  echo ""
  echo "For local analytics: gstack-analytics"
  exit 0
fi

# ─── Weekly active installs ──────────────────────────────────
WEEKLY="$(echo "$DATA" | grep -o '"weekly_active":[0-9]*' | grep -o '[0-9]*' || echo "0")"
CHANGE="$(echo "$DATA" | grep -o '"change_pct":[0-9-]*' | grep -o '[0-9-]*' || echo "0")"

echo "Weekly active installs: ${WEEKLY}"
# Marker check: jq when available (whitespace/reserialization-proof); the
# grep fallback tolerates optional whitespace around the colon.
_STALE="false"
if command -v jq >/dev/null 2>&1; then
  _MARKER="$(printf '%s' "$DATA" | jq -r '.status // empty' 2>/dev/null)"
  _STALE="$(printf '%s' "$DATA" | jq -r '.stale // false' 2>/dev/null)"
else
  _MARKER="$(printf '%s' "$DATA" | grep -Eq '"status"[[:space:]]*:[[:space:]]*"ok"' && echo ok || true)"
fi
if [ "$_MARKER" != "ok" ]; then
  echo "  (unverified — legacy backend response; deploy the latest community-pulse for verified figures)"
elif [ "$_STALE" = "true" ]; then
  # Backend serves its last good snapshot when recompute fails — real but
  # frozen figures must not read as current (matches security-dashboard).
  echo "  (stale snapshot — backend recompute failing; figures may be out of date)"
fi
if [ "$CHANGE" -gt 0 ] 2>/dev/null; then
  echo "  Change: +${CHANGE}%"
elif [ "$CHANGE" -lt 0 ] 2>/dev/null; then
  echo "  Change: ${CHANGE}%"
fi
echo ""

# ─── Skill popularity (top 10) ───────────────────────────────
echo "Top skills (last 7 days)"
echo "────────────────────────"

# Parse top_skills array from JSON
SKILLS="$(echo "$DATA" | grep -o '"top_skills":\[[^]]*\]' || echo "")"
if [ -n "$SKILLS" ] && [ "$SKILLS" != '"top_skills":[]' ]; then
  # Parse each object — handle any key order (JSONB doesn't preserve order)
  echo "$SKILLS" | grep -o '{[^}]*}' | while read -r OBJ; do
    SKILL="$(echo "$OBJ" | grep -o '"skill":"[^"]*"' | awk -F'"' '{print $4}')"
    COUNT="$(echo "$OBJ" | grep -o '"count":[0-9]*' | grep -o '[0-9]*')"
    [ -n "$SKILL" ] && [ -n "$COUNT" ] && printf "  /%-20s %s runs\n" "$SKILL" "$COUNT"
  done
else
  echo "  No data yet"
fi
echo ""

# ─── Crash clusters ──────────────────────────────────────────
echo "Top crash clusters"
echo "──────────────────"

CRASHES="$(echo "$DATA" | grep -o '"crashes":\[[^]]*\]' || echo "")"
if [ -n "$CRASHES" ] && [ "$CRASHES" != '"crashes":[]' ]; then
  echo "$CRASHES" | grep -o '{[^}]*}' | head -5 | while read -r OBJ; do
    ERR="$(echo "$OBJ" | grep -o '"error_class":"[^"]*"' | awk -F'"' '{print $4}')"
    C="$(echo "$OBJ" | grep -o '"total_occurrences":[0-9]*' | grep -o '[0-9]*')"
    [ -n "$ERR" ] && printf "  %-30s %s occurrences\n" "$ERR" "${C:-?}"
  done
else
  echo "  No crashes reported"
fi
echo ""

# ─── Version distribution ────────────────────────────────────
echo "Version distribution (last 7 days)"
echo "───────────────────────────────────"

VERSIONS="$(echo "$DATA" | grep -o '"versions":\[[^]]*\]' || echo "")"
if [ -n "$VERSIONS" ] && [ "$VERSIONS" != '"versions":[]' ]; then
  echo "$VERSIONS" | grep -o '{[^}]*}' | head -5 | while read -r OBJ; do
    VER="$(echo "$OBJ" | grep -o '"version":"[^"]*"' | awk -F'"' '{print $4}')"
    COUNT="$(echo "$OBJ" | grep -o '"count":[0-9]*' | grep -o '[0-9]*')"
    [ -n "$VER" ] && [ -n "$COUNT" ] && printf "  v%-15s %s events\n" "$VER" "$COUNT"
  done
else
  echo "  No data yet"
fi

echo ""
echo "For local analytics: gstack-analytics"