document.addEventListener('DOMContentLoaded', function () {
    function label(element, value) {
        if (element.hasAttribute('value')) {
            if (value !== undefined) {
                element.setAttribute('value', value)
            } else {
                return element.getAttribute('value')
            }
        } else {
            if (value !== undefined) {
                element.textContent = value
            } else {
                return element.textContent
            }
        }
    }

    function countdownDeleteButton(event) {
        const btn = event.target
        const countdown = btn.getAttribute('data-countdown')

        if (countdown !== '1') {
            event.preventDefault()
            btn.classList.add('__on-countdown')

            const hasCountdown = countdown !== null
            const newCountdown = hasCountdown ? countdown - 1 : 3

            if (!hasCountdown) {
                btn.setAttribute('data-label', label(btn))
            }

            label(btn, newCountdown)
            btn.setAttribute('data-countdown', newCountdown)
            setTimeout(countdownDeleteButton, 1000, event)
        } else {
            label(btn, btn.getAttribute('data-label'))
        }
    }

    document.querySelectorAll('.delete-btn').forEach(function (btn) {
        btn.addEventListener('click', countdownDeleteButton)
    })

    function dynamicTables() {
        const pageSize = 25

        const range = (x, y) =>
            x > y ? [] : [x, ...range(x + 1, y)];
        const visibleRows = page =>
            range(page * pageSize, (page + 1) * pageSize - 1)

        function toggleVisibilities(tbl, ixsToShow) {
            const rows = [...tbl.tBodies[0].rows]
            rows.forEach(function (row, ix) {
                row.style.display = ixsToShow.includes(ix) ? 'table-row' : 'none';
            })
        }

        function prevClick(tbl) {
            const page = tbl.getAttribute('data-page') * 1
            tbl.setAttribute('data-page', page - 1)
            toggleVisibilities(tbl, visibleRows(page - 1))
        }

        function nextClick(tbl) {
            const page = tbl.getAttribute('data-page') * 1
            tbl.setAttribute('data-page', page + 1)
            toggleVisibilities(tbl, visibleRows(page + 1))
        }

        function addToolbar(tbl) {
            const toolbar = document.createElement('section')
            toolbar.classList.add('tbl-toolbar')

            const prevBtn = document.createElement('button')
            prevBtn.classList.add('prev')
            prevBtn.innerText = 'Prev'
            prevBtn.addEventListener('click', function () {
                prevClick(tbl)
            })
            toolbar.insertAdjacentElement('beforeend', prevBtn)

            const nextBtn = document.createElement('button')
            nextBtn.classList.add('next')
            nextBtn.innerText = 'Next'
            nextBtn.addEventListener('click', function () {
                nextClick(tbl)
            })
            toolbar.insertAdjacentElement('beforeend', nextBtn)

            tbl.insertAdjacentElement('afterend', toolbar)
        }

        document.querySelectorAll('table').forEach(function (tbl) {
            toggleVisibilities(tbl, visibleRows(0))
            tbl.setAttribute('data-page', 0)
            addToolbar(tbl)
        })
    }

    dynamicTables()
})

/*
  $(document).ready(function() {
  $('table').DataTable({
  stateSave: true,
  fixedHeader: true,
  lengthMenu: [[25, 50, 100, -1], [25, 50, 100, "All"]],
  stateSaveCallback: function(settings,data) {
  localStorage.setItem('DataTables', JSON.stringify(data))
  },
  stateLoadCallback: function(settings) {
  return JSON.parse(localStorage.getItem('DataTables'))
  }
  })
  })
*/