import autoTable from "jspdf-autotable";
import {
  createBrandedPdf,
  addBrandedFooter,
  COLORS,
  TABLE_HEAD_STYLES,
  TABLE_BODY_STYLES,
  TABLE_STYLES,
} from "./pdf-template";

interface PoItem {
  product_name: string;
  product_sku: string;
  quantity: number;
  unit_price: number;
  line_total: number;
  notes?: string | null;
}

interface PoPdfData {
  po_number: string;
  order_date: string;
  due_date?: string | null;
  customer_ref?: string | null;
  status: string;
  customer_name: string;
  customer_code: string;
  customer_email?: string | null;
  customer_phone?: string | null;
  customer_address?: string | null;
  customer_contact?: string | null;
  notes?: string | null;
  items: PoItem[];
}

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

export function generatePoPdf(data: PoPdfData) {
  const { doc, contentY } = createBrandedPdf({
    title: "PURCHASE ORDER",
    documentNumber: data.po_number,
    date: new Date(data.order_date).toLocaleDateString("en-GB"),
    recipient: {
      label: "BILL TO",
      name: data.customer_name,
      code: data.customer_code,
      contact: data.customer_contact,
      address: data.customer_address,
      phone: data.customer_phone,
      email: data.customer_email,
    },
  });

  const pageWidth = doc.internal.pageSize.getWidth();
  const margin = 14;
  const contentWidth = pageWidth - margin * 2;

  // --- Order details row ---
  let y = contentY;
  doc.setFillColor(...COLORS.bgLight);
  doc.setDrawColor(...COLORS.border);
  doc.setLineWidth(0.2);
  doc.roundedRect(margin, y, contentWidth, 14, 1.5, 1.5, "FD");

  const detailItems = [
    { label: "Customer Ref", value: data.customer_ref || "-" },
    { label: "Due Date", value: data.due_date ? new Date(data.due_date).toLocaleDateString("en-GB") : "-" },
    { label: "Status", value: data.status.charAt(0).toUpperCase() + data.status.slice(1).replace("_", " ") },
  ];

  detailItems.forEach((item, i) => {
    const x = margin + 4 + i * (contentWidth / 3);
    doc.setFontSize(6.5);
    doc.setFont("helvetica", "normal");
    doc.setTextColor(...COLORS.muted);
    doc.text(item.label, x, y + 5);
    doc.setFontSize(8);
    doc.setFont("helvetica", "bold");
    doc.setTextColor(...COLORS.primary);
    doc.text(item.value, x, y + 11);
  });

  y += 20;

  // --- Line Items table ---
  doc.setFontSize(9);
  doc.setFont("helvetica", "bold");
  doc.setTextColor(...COLORS.primary);
  doc.text("Order Items", margin, y);
  y += 4;

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

  const tableData = data.items.map((item, i) => [
    String(i + 1),
    `${item.product_name}\n${item.product_sku}`,
    String(item.quantity),
    formatCurrency(item.unit_price),
    formatCurrency(item.line_total),
  ]);

  autoTable(doc, {
    startY: y,
    head: [["#", "Product", "Qty", "Unit Price", "Total"]],
    body: tableData,
    foot: [["", "", String(totalQty), "", formatCurrency(totalValue)]],
    theme: "grid",
    headStyles: TABLE_HEAD_STYLES,
    bodyStyles: TABLE_BODY_STYLES,
    footStyles: {
      fillColor: [247, 247, 247],
      textColor: [23, 23, 23],
      fontSize: 8,
      fontStyle: "bold",
      cellPadding: 3,
    },
    alternateRowStyles: { fillColor: [252, 252, 252] },
    columnStyles: {
      0: { cellWidth: 12, halign: "center" },
      1: { cellWidth: "auto" },
      2: { cellWidth: 20, halign: "center" },
      3: { cellWidth: 30, halign: "right" },
      4: { cellWidth: 30, halign: "right" },
    },
    margin: { left: margin, right: margin },
    styles: TABLE_STYLES,
  });

  // --- Grand Total box ---
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  const finalY = (doc as any).lastAutoTable?.finalY || y + 30;
  const totalBoxY = finalY + 4;
  const totalBoxW = 60;
  const totalBoxX = pageWidth - margin - totalBoxW;

  doc.setFillColor(...COLORS.bgLight);
  doc.setDrawColor(...COLORS.border);
  doc.setLineWidth(0.2);
  doc.roundedRect(totalBoxX, totalBoxY, totalBoxW, 12, 1.5, 1.5, "FD");

  doc.setFontSize(7);
  doc.setFont("helvetica", "normal");
  doc.setTextColor(...COLORS.muted);
  doc.text("TOTAL", totalBoxX + 4, totalBoxY + 5);
  doc.setFontSize(10);
  doc.setFont("helvetica", "bold");
  doc.setTextColor(...COLORS.primary);
  doc.text(formatCurrency(totalValue), totalBoxX + totalBoxW - 4, totalBoxY + 9.5, {
    align: "right",
  });

  // --- 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;
}