import {
  createBrandedPdf,
  addBrandedFooter,
  COLORS,
} from "./pdf-template";

interface SupplierPoItem {
  part_number: string;
  component_name: string;
  supplier_part_number?: string | null;
  quantity: number;
  unit_price: number;
}

interface SupplierPoPdfData {
  po_number: string;
  date: string;
  status: string;
  supplier_name: string;
  supplier_code: string;
  supplier_email?: string | null;
  supplier_phone?: string | null;
  supplier_address?: string | null;
  supplier_contact?: string | null;
  supplier_country?: string | null;
  supplier_currency?: string | null;
  shipping_cost?: number;
  notes?: string | null;
  items: SupplierPoItem[];
}

function makeCurrencyFormatter(currency: string) {
  return (val: number): string =>
    new Intl.NumberFormat("en-GB", {
      style: "currency",
      currency,
    }).format(val);
}

export function generateSupplierPoPdf(data: SupplierPoPdfData) {
  const { doc, contentY } = createBrandedPdf({
    title: "PURCHASE ORDER",
    documentNumber: data.po_number,
    date: new Date(data.date).toLocaleDateString("en-GB"),
    recipient: {
      label: "SUPPLIER",
      name: data.supplier_name,
      code: data.supplier_code,
      contact: data.supplier_contact,
      address: data.supplier_address,
      phone: data.supplier_phone,
      email: data.supplier_email,
    },
  });

  const pageWidth = doc.internal.pageSize.getWidth();
  const margin = 14;
  const currency = data.supplier_currency || "EUR";
  const formatCurrency = makeCurrencyFormatter(currency);
  const shippingCost = data.shipping_cost || 0;
  const isPortugal = (data.supplier_country || "").toLowerCase().trim() === "portugal";

  // --- Order Items Section ---
  let y = contentY;
  const contentWidth = pageWidth - margin * 2;
  const rightEdge = pageWidth - margin;

  const totalValue = data.items.reduce((sum, item) => sum + item.quantity * item.unit_price, 0);
  const totalQty = data.items.reduce((sum, item) => sum + item.quantity, 0);

  // Section header
  doc.setFontSize(9);
  doc.setFont("helvetica", "bold");
  doc.setTextColor(...COLORS.primary);
  doc.text("ORDER ITEMS", margin, y);

  y += 5;

  // Column headers -- no grid, just text labels
  const colX = {
    num: margin + 1,
    part: margin + 10,
    name: margin + 42,
    ref: margin + 105,
    qty: rightEdge - 54,
    price: rightEdge - 30,
    total: rightEdge,
  };

  doc.setFontSize(6);
  doc.setFont("helvetica", "bold");
  doc.setTextColor(...COLORS.muted);
  doc.text("#", colX.num, y);
  doc.text("PART NUMBER", colX.part, y);
  doc.text("COMPONENT", colX.name, y);
  doc.text("SUPPLIER REF", colX.ref, y);
  doc.text("QTY", colX.qty, y, { align: "right" });
  doc.text("UNIT PRICE", colX.price, y, { align: "right" });
  doc.text("TOTAL", colX.total, y, { align: "right" });

  y += 1.5;
  doc.setDrawColor(...COLORS.border);
  doc.setLineWidth(0.3);
  doc.line(margin, y, rightEdge, y);
  y += 3;

  // Item rows -- clean card-like rows with left accent
  const rowH = 9;
  data.items.forEach((item, i) => {
    const isAlt = i % 2 === 1;
    const rowY = y;

    // Subtle alternating background
    if (isAlt) {
      doc.setFillColor(250, 250, 252);
      doc.rect(margin, rowY - 2.5, contentWidth, rowH, "F");
    }

    // Left accent bar (blue)
    doc.setFillColor(...COLORS.accent);
    doc.rect(margin, rowY - 2.5, 1.2, rowH, "F");

    // Row number
    doc.setFontSize(7);
    doc.setFont("helvetica", "normal");
    doc.setTextColor(...COLORS.muted);
    doc.text(String(i + 1), colX.num + 2, rowY + 1.5);

    // Part number -- monospaced feel
    doc.setFontSize(7.5);
    doc.setFont("courier", "bold");
    doc.setTextColor(...COLORS.primary);
    doc.text(item.part_number, colX.part, rowY + 1.5);

    // Component name
    doc.setFont("helvetica", "normal");
    doc.setTextColor(...COLORS.secondary);
    const nameMaxW = colX.ref - colX.name - 3;
    const truncatedName = doc.getTextWidth(item.component_name) > nameMaxW
      ? item.component_name.substring(0, Math.floor(item.component_name.length * nameMaxW / doc.getTextWidth(item.component_name))) + "..."
      : item.component_name;
    doc.text(truncatedName, colX.name, rowY + 1.5);

    // Supplier ref
    doc.setFontSize(7);
    doc.setFont("helvetica", "normal");
    doc.setTextColor(...COLORS.muted);
    doc.text(item.supplier_part_number || "-", colX.ref, rowY + 1.5);

    // Quantity -- emphasized
    doc.setFontSize(8);
    doc.setFont("helvetica", "bold");
    doc.setTextColor(...COLORS.primary);
    doc.text(String(item.quantity), colX.qty, rowY + 1.5, { align: "right" });

    // Unit price
    doc.setFontSize(7.5);
    doc.setFont("helvetica", "normal");
    doc.setTextColor(...COLORS.secondary);
    doc.text(formatCurrency(item.unit_price), colX.price, rowY + 1.5, { align: "right" });

    // Line total
    doc.setFont("helvetica", "bold");
    doc.setTextColor(...COLORS.primary);
    doc.text(formatCurrency(item.quantity * item.unit_price), colX.total, rowY + 1.5, { align: "right" });

    y += rowH;
  });

  // Bottom separator
  y += 1;
  doc.setDrawColor(...COLORS.border);
  doc.setLineWidth(0.3);
  doc.line(margin, y, rightEdge, y);

  // --- Summary section ---
  y += 5;

  const summaryW = 75;
  const summaryX = rightEdge - summaryW;
  const labelX = summaryX + 4;
  const valueX = rightEdge - 4;
  const lineSpacing = 6;

  // Subtotal
  doc.setFontSize(7.5);
  doc.setFont("helvetica", "normal");
  doc.setTextColor(...COLORS.muted);
  doc.text("Subtotal", labelX, y);
  doc.setFont("helvetica", "bold");
  doc.setTextColor(...COLORS.primary);
  doc.text(formatCurrency(totalValue), valueX, y, { align: "right" });
  y += lineSpacing;

  // Shipping
  doc.setFont("helvetica", "normal");
  doc.setTextColor(...COLORS.muted);
  doc.text("Shipping", labelX, y);
  doc.setFont("helvetica", "bold");
  doc.setTextColor(...COLORS.primary);
  doc.text(formatCurrency(shippingCost), valueX, y, { align: "right" });
  y += lineSpacing;

  // VAT for Portugal
  let vatAmount = 0;
  if (isPortugal) {
    vatAmount = (totalValue + shippingCost) * 0.23;
    doc.setFont("helvetica", "normal");
    doc.setTextColor(...COLORS.muted);
    doc.text("VAT (23%)", labelX, y);
    doc.setFont("helvetica", "bold");
    doc.setTextColor(...COLORS.primary);
    doc.text(formatCurrency(vatAmount), valueX, y, { align: "right" });
    y += lineSpacing;
  }

  // Separator line
  y += 1;
  doc.setDrawColor(...COLORS.border);
  doc.setLineWidth(0.3);
  doc.line(summaryX, y, rightEdge, y);
  y += 4;

  // Grand total box
  const grandTotal = totalValue + shippingCost + vatAmount;
  const totalBoxW = summaryW;
  const totalBoxX = summaryX;
  const totalBoxY = y - 3;

  doc.setFillColor(...COLORS.accent);
  doc.roundedRect(totalBoxX, totalBoxY, totalBoxW, 12, 2, 2, "F");

  doc.setFontSize(6.5);
  doc.setFont("helvetica", "bold");
  doc.setTextColor(220, 230, 245);
  doc.text("TOTAL", totalBoxX + 5, totalBoxY + 5);
  doc.setFontSize(11);
  doc.setFont("helvetica", "bold");
  doc.setTextColor(255, 255, 255);
  doc.text(formatCurrency(grandTotal), totalBoxX + totalBoxW - 5, totalBoxY + 9, { align: "right" });

  const finalY = totalBoxY + 14;

  // --- Notes ---
  if (data.notes) {
    const noteY = totalBoxY + 18;
    doc.setFillColor(...COLORS.bgLight);
    doc.setDrawColor(...COLORS.border);
    doc.setLineWidth(0.2);
    doc.roundedRect(margin, noteY, contentWidth, 16, 1.5, 1.5, "FD");
    doc.setFontSize(6.5);
    doc.setFont("helvetica", "bold");
    doc.setTextColor(...COLORS.accent);
    doc.text("NOTES", margin + 4, noteY + 5);
    doc.setFontSize(7.5);
    doc.setFont("helvetica", "normal");
    doc.setTextColor(...COLORS.secondary);
    const noteLines = doc.splitTextToSize(data.notes, contentWidth - 8);
    doc.text(noteLines, margin + 4, noteY + 11);
  }

  addBrandedFooter(doc);
  return doc;
}