import type { GridColDef } from "@mui/x-data-grid";
import type { MockInvoice } from "@/mocks";

const currencyFormatter = new Intl.NumberFormat("en-US", {
  style: "currency",
  currency: "USD",
});

const dateFormatter = new Intl.DateTimeFormat("en-US", {
  year: "numeric",
  month: "short",
  day: "numeric",
});

function formatIsoDate(value: string | null | undefined): string {
  if (!value) {
    return "—";
  }
  const parsed = new Date(`${value}T00:00:00`);
  if (Number.isNaN(parsed.getTime())) {
    return value;
  }
  return dateFormatter.format(parsed);
}

function formatCurrency(value: number | null | undefined): string {
  if (value == null) {
    return "—";
  }
  return currencyFormatter.format(value);
}

const moneyColumn = (field: keyof MockInvoice, headerName: string): GridColDef<MockInvoice> => ({
  field,
  headerName,
  flex: 1,
  minWidth: 120,
  type: "number",
  valueFormatter: (value: number | null | undefined) => formatCurrency(value),
});

const dateColumn = (
  field: keyof MockInvoice,
  headerName: string,
  editable = false,
): GridColDef<MockInvoice> => ({
  field,
  headerName,
  flex: 1,
  minWidth: 130,
  editable,
  valueFormatter: (value: string | null | undefined) => formatIsoDate(value),
});

export const pendingApprovalColumns: GridColDef<MockInvoice>[] = [
  { field: "invoiceNumbers", headerName: "Invoice #", flex: 1, minWidth: 120 },
  { field: "vendorName", headerName: "Vendor", flex: 1.4, minWidth: 160 },
  dateColumn("dueDate", "Due Date"),
  dateColumn("sendPaymentOn", "Send Payment On"),
  { field: "paymentMethod", headerName: "Payment Method", flex: 1, minWidth: 130 },
  moneyColumn("amountDue", "Amount Due"),
  moneyColumn("amount", "Amount"),
];

export const readyToPayColumns: GridColDef<MockInvoice>[] = [
  dateColumn("dueDate", "Due Date"),
  dateColumn("payDate", "Pay Date", true),
  { field: "vendorName", headerName: "Vendor", flex: 1.4, minWidth: 160 },
  { field: "invoiceNumber", headerName: "Invoice #", flex: 1, minWidth: 120 },
  moneyColumn("amountDue", "Amount Due"),
];

export const allInvoicesColumns: GridColDef<MockInvoice>[] = [
  { field: "invoiceNumber", headerName: "Invoice #", flex: 1, minWidth: 120 },
  { field: "vendorName", headerName: "Vendor", flex: 1.4, minWidth: 160 },
  { field: "status", headerName: "Status", flex: 1, minWidth: 140 },
  dateColumn("dueDate", "Due Date"),
  dateColumn("payDate", "Pay Date"),
  { field: "paymentMethod", headerName: "Payment Method", flex: 1, minWidth: 130 },
  moneyColumn("amountDue", "Amount Due"),
  moneyColumn("amount", "Amount"),
];