import ExcelJS from 'exceljs';
import type { DashboardReportPayload } from '../types/dashboardReport.ts';
import { buildPdfFilename, isoDataDates } from '../components/shared/PdfReportHeader.tsx';
import { countingTotals, feedInTotals, feedUseTotals } from './reportTotals.ts';

const dayRangeLabel = (upToDay: number): string => `Hari ke-0 s/d ke-${upToDay}`;

const accuracyText = (value: number | null | undefined): string =>
  value == null || !Number.isFinite(value) ? 'N/A' : `${value.toFixed(1)}%`;

const numOrNa = (value: number | null | undefined): number | string =>
  value == null || !Number.isFinite(value) ? 'N/A' : value;

function writeMetaRow(sheet: ExcelJS.Worksheet, snapshot: DashboardReportPayload): void {
  sheet.addRow([
    `Kandang: ${snapshot.kandangName}`,
    `Siklus: ${snapshot.cycleId}`,
    `Periode: ${dayRangeLabel(snapshot.upToDay)}`,
    `Dibuat: ${snapshot.generatedAt}`,
  ]);
}

export async function buildReportWorkbook(
  snapshot: DashboardReportPayload
): Promise<ExcelJS.Workbook> {
  const workbook = new ExcelJS.Workbook();
  workbook.creator = 'Dashboard CPSP';
  workbook.created = snapshot.generatedAt ? new Date(snapshot.generatedAt) : new Date();

  const counting = workbook.addWorksheet('Counting');
  writeMetaRow(counting, snapshot);
  counting.addRow([
    'Tanggal',
    'Umur (hari)',
    'Stok awal',
    'Mortalitas',
    'Panen',
    'Berat panen',
    'Stok akhir',
    'IoT',
    'Akurasi %',
  ]);
  for (const row of snapshot.counting || []) {
    counting.addRow([
      row.date,
      row.day,
      numOrNa(row.countBefore),
      numOrNa(row.mortality),
      numOrNa(row.harvest),
      numOrNa(row.harvestWeight),
      numOrNa(row.countAfter),
      numOrNa(row.iotCount),
      accuracyText(row.accuracy),
    ]);
  }
  const countingTotal = countingTotals(snapshot.counting || []);
  if (countingTotal) {
    counting.addRow([
      countingTotal.label,
      '—',
      numOrNa(countingTotal.countBefore),
      numOrNa(countingTotal.mortality),
      numOrNa(countingTotal.harvest),
      numOrNa(countingTotal.harvestWeight),
      numOrNa(countingTotal.countAfter),
      numOrNa(countingTotal.iotCount),
      accuracyText(countingTotal.accuracy),
    ]);
  }

  const weight = workbook.addWorksheet('Weight');
  writeMetaRow(weight, snapshot);
  weight.addRow([
    'Tanggal',
    'Umur (hari)',
    'Rata-rata manual',
    'Rata-rata IoT',
    'Keseragaman',
    'Selisih',
    'Akurasi %',
  ]);
  for (const row of snapshot.weight || []) {
    weight.addRow([
      row.date,
      row.day,
      numOrNa(row.avgManual),
      numOrNa(row.avgIot),
      accuracyText(row.uniformity),
      numOrNa(row.difference),
      accuracyText(row.accuracy),
    ]);
  }

  const feedIn = workbook.addWorksheet('Feed In');
  writeMetaRow(feedIn, snapshot);
  feedIn.addRow(['Tanggal', 'Manual masuk', 'IoT masuk', 'Akurasi %']);
  for (const row of snapshot.feedIn || []) {
    feedIn.addRow([row.date, numOrNa(row.manualIn), numOrNa(row.iotIn), accuracyText(row.accuracy)]);
  }
  const feedInTotal = feedInTotals(snapshot.feedIn || []);
  if (feedInTotal) {
    feedIn.addRow([
      feedInTotal.label,
      numOrNa(feedInTotal.manualIn),
      numOrNa(feedInTotal.iotIn),
      accuracyText(feedInTotal.accuracy),
    ]);
  }

  const feedUse = workbook.addWorksheet('Feed Use');
  writeMetaRow(feedUse, snapshot);
  feedUse.addRow(['Tanggal', 'Umur (hari)', 'Manual dituang', 'IoT dituang', 'Akurasi %']);
  for (const row of snapshot.feedUse || []) {
    feedUse.addRow([
      row.date,
      row.day,
      numOrNa(row.manualUse),
      numOrNa(row.iotUse),
      accuracyText(row.accuracy),
    ]);
  }
  const feedUseTotal = feedUseTotals(snapshot.feedUse || []);
  if (feedUseTotal) {
    feedUse.addRow([
      feedUseTotal.label,
      '—',
      numOrNa(feedUseTotal.manualUse),
      numOrNa(feedUseTotal.iotUse),
      accuracyText(feedUseTotal.accuracy),
    ]);
  }

  if (snapshot.reportType === 'end_cycle') {
    const harvestKg = (grams: number | null | undefined): number | string =>
      grams == null || !Number.isFinite(grams) ? 'N/A' : grams / 1000;

    const fcr = workbook.addWorksheet('FCR');
    writeMetaRow(fcr, snapshot);
    fcr.addRow(['Umur', 'Total Pakan', 'Bobot IoT', 'Ayam Hidup', 'Total Bobot Panen', 'FCR']);
    for (const row of snapshot.fcr || []) {
      fcr.addRow([
        row.day,
        numOrNa(row.feedTotal),
        numOrNa(row.iotWeight),
        numOrNa(row.chickenLife),
        harvestKg(row.harvestWeightTotal),
        numOrNa(row.iotFcr),
      ]);
    }

    const eef = workbook.addWorksheet('EEF');
    writeMetaRow(eef, snapshot);
    eef.addRow([
      'Umur',
      'Persentase Ayam Hidup',
      'BW Rata-rata Panen',
      'Umur Rata-rata Panen',
      'FCR',
      'EEF',
    ]);
    for (const row of snapshot.eef || []) {
      eef.addRow([
        row.day,
        numOrNa(row.chickenLifePercentage),
        numOrNa(row.iotAverageHarvestBw),
        numOrNa(row.iotAverageDayWeight),
        numOrNa(row.iotFcr),
        numOrNa(row.iotEef),
      ]);
    }
  }

  return workbook;
}

export function reportExcelFilename(
  snapshot: DashboardReportPayload,
  cycleStartDate?: Date | string | null
): string {
  const isEndCycle = snapshot.reportType === 'end_cycle';
  const pdfName = buildPdfFilename({
    prefix: 'Laporan',
    reportName: isEndCycle ? 'Akhir-Siklus' : 'Harian',
    area: snapshot.area,
    kandangLabel: snapshot.kandangName,
    periodSlug: isEndCycle ? 'Akhir-Siklus' : `Harian-Hari-${snapshot.upToDay}`,
    isoDates: isoDataDates(cycleStartDate, 0, snapshot.upToDay),
  });
  return pdfName.replace(/\.pdf$/i, '.xlsx');
}

export async function downloadReportExcel(
  snapshot: DashboardReportPayload,
  cycleStartDate?: Date | string | null
): Promise<void> {
  const workbook = await buildReportWorkbook(snapshot);
  const buffer = await workbook.xlsx.writeBuffer();
  const blob = new Blob([buffer], {
    type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
  });
  const url = URL.createObjectURL(blob);
  const link = document.createElement('a');
  link.href = url;
  link.download = reportExcelFilename(snapshot, cycleStartDate);
  document.body.appendChild(link);
  link.click();
  link.remove();
  URL.revokeObjectURL(url);
}