// ** MUI Imports
import Paper from '@mui/material/Paper'
import Table from '@mui/material/Table'
import TableRow from '@mui/material/TableRow'
import TableHead from '@mui/material/TableHead'
import TableBody from '@mui/material/TableBody'
import TableCell from '@mui/material/TableCell'
import TableContainer from '@mui/material/TableContainer'

interface Row {
  desc: string
  qty: number
  unit: number
  price: number
}

const TAX_RATE = 0.07

const ccyFormat = (num: number) => {
  return `${num.toFixed(2)}`
}

const priceRow = (qty: number, unit: number) => {
  return qty * unit
}

const createRow = (desc: string, qty: number, unit: number) => {
  const price = priceRow(qty, unit)

  return { desc, qty, unit, price }
}

const subtotal = (items: readonly Row[]) => {
  return items.map(({ price }) => price).reduce((sum, i) => sum + i, 0)
}

const rows = [
  createRow('Paperclips (Box)', 100, 1.15),
  createRow('Paper (Case)', 10, 45.99),
  createRow('Waste Basket', 2, 17.99)
]

const invoiceSubtotal = subtotal(rows)
const invoiceTaxes = TAX_RATE * invoiceSubtotal
const invoiceTotal = invoiceTaxes + invoiceSubtotal

const TableSpanning = () => {
  return (
    <TableContainer component={Paper}>
      <Table sx={{ minWidth: 700 }} aria-label='spanning table'>
        <TableHead>
          <TableRow>
            <TableCell align='center' colSpan={3}>
              Details
            </TableCell>
            <TableCell align='right'>Price</TableCell>
          </TableRow>
          <TableRow>
            <TableCell>Desc</TableCell>
            <TableCell align='right'>Qty.</TableCell>
            <TableCell align='right'>Unit</TableCell>
            <TableCell align='right'>Sum</TableCell>
          </TableRow>
        </TableHead>
        <TableBody>
          {rows.map(row => (
            <TableRow key={row.desc}>
              <TableCell>{row.desc}</TableCell>
              <TableCell align='right'>{row.qty}</TableCell>
              <TableCell align='right'>{row.unit}</TableCell>
              <TableCell align='right'>{ccyFormat(row.price)}</TableCell>
            </TableRow>
          ))}
          <TableRow>
            <TableCell rowSpan={3} />
            <TableCell colSpan={2}>Subtotal</TableCell>
            <TableCell align='right'>{ccyFormat(invoiceSubtotal)}</TableCell>
          </TableRow>
          <TableRow>
            <TableCell>Tax</TableCell>
            <TableCell align='right'>{`${(TAX_RATE * 100).toFixed(0)} %`}</TableCell>
            <TableCell align='right'>{ccyFormat(invoiceTaxes)}</TableCell>
          </TableRow>
          <TableRow>
            <TableCell colSpan={2}>Total</TableCell>
            <TableCell align='right'>{ccyFormat(invoiceTotal)}</TableCell>
          </TableRow>
        </TableBody>
      </Table>
    </TableContainer>
  )
}

export default TableSpanning