#!/usr/bin/env bash
set -euo pipefail

STATE_DIR="${STATE_DIR:-/home/node/.openclaw/workspace/state}"
STATE_FILE="${STATE_FILE:-$STATE_DIR/gmail-unread-state.json}"
ACCOUNT="${ACCOUNT:-claw@ben.io}"
MAX_RESULTS="${MAX_RESULTS:-10}"
OPENCLAW_BIN="${OPENCLAW_BIN:-openclaw}"
CHANNEL="${CHANNEL:-discord}"
DEST="${DEST:-channel:1467247377743347953}"
ACCOUNT_ID="${ACCOUNT_ID:-default}"

mkdir -p "$STATE_DIR"

TMP_LIST=$(mktemp)
trap 'rm -f "$TMP_LIST"' EXIT

if ! gws gmail users messages list --params "{\"userId\":\"me\",\"maxResults\":$MAX_RESULTS,\"q\":\"is:unread\"}" --format json > "$TMP_LIST" 2>/dev/null; then
  echo "gmail-unread-poll: failed to query Gmail unread messages" >&2
  exit 1
fi

CURRENT_IDS=$(node -e '
const fs = require("fs");
const data = JSON.parse(fs.readFileSync(process.argv[1], "utf8"));
const ids = (data.messages || []).map(m => m.id).sort();
process.stdout.write(JSON.stringify(ids));
' "$TMP_LIST")

if [[ -f "$STATE_FILE" ]]; then
  PREV_IDS=$(node -e '
const fs = require("fs");
const p = process.argv[1];
const data = JSON.parse(fs.readFileSync(p, "utf8"));
process.stdout.write(JSON.stringify((data.unreadIds || []).sort()));
' "$STATE_FILE")
else
  PREV_IDS='[]'
fi

if [[ "$CURRENT_IDS" == "$PREV_IDS" ]]; then
  exit 0
fi

NEW_IDS=$(node -e '
const prev = new Set(JSON.parse(process.argv[1]));
const curr = JSON.parse(process.argv[2]);
process.stdout.write(JSON.stringify(curr.filter(id => !prev.has(id))));
' "$PREV_IDS" "$CURRENT_IDS")

NEW_COUNT=$(node -e 'const a = JSON.parse(process.argv[1]); process.stdout.write(String(a.length));' "$NEW_IDS")
TOTAL_UNREAD=$(node -e 'const a = JSON.parse(process.argv[1]); process.stdout.write(String(a.length));' "$CURRENT_IDS")

if [[ "$NEW_COUNT" -gt 0 ]]; then
  SUMMARY=$(node - <<'NODE' "$NEW_IDS"
const ids = JSON.parse(process.argv[2]);
console.log(`claw@ben.io: ${ids.length} new unread mail(s)`);
NODE
)

  DETAILS=()
  while IFS= read -r id; do
    [[ -z "$id" ]] && continue
    JSON=$(gws gmail +read --message-id "$id" --format json 2>/dev/null || true)
    if [[ -n "$JSON" ]]; then
      LINE=$(node -e '
const fs = require("fs");
const data = JSON.parse(fs.readFileSync(0, "utf8"));
const from = data.from?.email || data.from?.name || "unknown";
const subject = data.subject || "(no subject)";
process.stdout.write(`- ${from} — ${subject}`);
' <<<"$JSON")
      DETAILS+=("$LINE")
    fi
  done < <(node -e 'for (const id of JSON.parse(process.argv[1])) console.log(id)' "$NEW_IDS")

  MSG="$SUMMARY
Total unread: $TOTAL_UNREAD"
  if [[ ${#DETAILS[@]} -gt 0 ]]; then
    MSG+="
$(printf '%s
' "${DETAILS[@]}")"
  fi

  "$OPENCLAW_BIN" message send \
    --account "$ACCOUNT_ID" \
    --channel "$CHANNEL" \
    --target "$DEST" \
    --message "$MSG" >/dev/null 2>&1 || {
      echo "gmail-unread-poll: failed to send notification" >&2
      exit 1
    }
fi

node - <<'NODE' "$STATE_FILE" "$CURRENT_IDS"
const fs = require('fs');
const path = process.argv[2];
const unreadIds = JSON.parse(process.argv[3]);
fs.writeFileSync(path, JSON.stringify({ unreadIds, updatedAt: new Date().toISOString() }, null, 2));
NODE