interface ReportSummary {
    totalReports: number;
    firstTimestamp: Date;
    lastTimestamp: Date;
    reportsPerUnit: Record<string, number>;
}

interface vehicleDetails {
  vehicleNumber: string;
  reportCount: number;
  cabFront: boolean;
  cabRear: boolean;
}

interface ReportsByUnit {
  unitNumber: string;
  vehicles: vehicleDetails[];
  comments: string[];
}

interface Report {
    unitNumber: string;
    reported: string;
    comments: string;
    utcTimestamp: string;
    faults: string[];
}

export async function organiseReports(): Promise<ReportSummary> {
  try {
    const res = await fetch('https://rep.fjla.uk/fetch');
    if (!res.ok) throw new Error(`Fetch failed: ${res.statusText}`);

    const reports: Report[] = await res.json();

    if (reports.length === 0) {
        return {
            totalReports: 0,
            firstTimestamp: new Date(0), // Epoch
            lastTimestamp: new Date(0),
            reportsPerUnit: {},
        };
    }

    // Sort by string utcTimestamp (lexical sort works fine for ISO strings)
    reports.sort((a, b) => a.utcTimestamp.localeCompare(b.utcTimestamp));

    const firstTimestamp = reports[0].utcTimestamp;
    const lastTimestamp = reports[reports.length - 1].utcTimestamp;
    const totalReports = reports.length;

    const reportsPerUnit: Record<string, number> = {};
    for (const report of reports) {
      const unit = report.unitNumber;
      reportsPerUnit[unit] = (reportsPerUnit[unit] || 0) + 1;
    }

    return {
        totalReports,
        firstTimestamp: new Date(firstTimestamp),
        lastTimestamp: new Date(lastTimestamp),
        reportsPerUnit,
    };
  } catch (err) {
    console.error('Error organising reports:', err);
    throw err;
  }
}

// Fetch all unit numbers.
// Group reports by unit number.
// Build HTML for each report.

(async () => {
  try {
    const summary = await organiseReports();
    console.log("Total reports:", summary.totalReports);
    console.log("First report:", summary.firstTimestamp.toISOString());
    console.log("Last report:", summary.lastTimestamp.toISOString());
    console.log("Reports per unit:", summary.reportsPerUnit);
  } catch (err) {
    console.error("Failed to organise reports:", err);
  }
})();