停滞した商談を検出

export const main = async (params) => {
  const opportunities = params.opportunities;

  // Group opportunities by owner
  const byOwner = {};
  opportunities.forEach(opp => {
    const ownerEmail = opp.owner?.email || 'unassigned';
    if (!byOwner[ownerEmail]) {
      byOwner[ownerEmail] = [];
    }
    byOwner[ownerEmail].push({
      name: opp.name,
      amount: opp.amount,
      lastUpdated: opp.updatedAt,
      stage: opp.stage
    });
  });

  // Format summary for manager
  let summary = "Stale Opportunities Report\n\n";
  Object.entries(byOwner).forEach(([owner, opps]) => {
    summary += `${owner}: ${opps.length} stale opportunities\n`;
    opps.forEach(opp => {
      summary += `  - ${opp.name} (${opp.stage})\n`;
    });
    summary += "\n";
  });

  return {
    summary,
    totalCount: opportunities.length
  };
};