'use strict';
function editCoastline(node = d3.event.target) {
  if (customization) return;
  closeDialogs('.stable');
  if (layerIsOn('toggleCells')) toggleCells();

  $('#coastlineEditor').dialog({
    title: 'Edit Coastline',
    resizable: false,
    position: {my: 'center top+20', at: 'top', of: d3.event, collision: 'fit'},
    close: closeCoastlineEditor
  });

  debug.append('g').attr('id', 'vertices');
  elSelected = d3.select(node);
  selectCoastlineGroup(node);
  drawCoastlineVertices();
  viewbox.on('touchmove mousemove', null);

  if (modules.editCoastline) return;
  modules.editCoastline = true;

  // add listeners
  document.getElementById('coastlineGroupsShow').addEventListener('click', showGroupSection);
  document.getElementById('coastlineGroup').addEventListener('change', changeCoastlineGroup);
  document.getElementById('coastlineGroupAdd').addEventListener('click', toggleNewGroupInput);
  document.getElementById('coastlineGroupName').addEventListener('change', createNewGroup);
  document.getElementById('coastlineGroupRemove').addEventListener('click', removeCoastlineGroup);
  document.getElementById('coastlineGroupsHide').addEventListener('click', hideGroupSection);
  document.getElementById('coastlineEditStyle').addEventListener('click', editGroupStyle);

  function drawCoastlineVertices() {
    const f = +elSelected.attr('data-f'); // feature id
    const v = pack.features[f].vertices; // coastline outer vertices

    const l = pack.cells.i.length;
    const c = [...new Set(v.map((v) => pack.vertices.c[v]).flat())].filter((c) => c < l);
    debug
      .select('#vertices')
      .selectAll('polygon')
      .data(c)
      .enter()
      .append('polygon')
      .attr('points', (d) => getPackPolygon(d))
      .attr('data-c', (d) => d);

    debug
      .select('#vertices')
      .selectAll('circle')
      .data(v)
      .enter()
      .append('circle')
      .attr('cx', (d) => pack.vertices.p[d][0])
      .attr('cy', (d) => pack.vertices.p[d][1])
      .attr('r', 0.4)
      .attr('data-v', (d) => d)
      .call(d3.drag().on('drag', dragVertex))
      .on('mousemove', () => tip('Drag to move the vertex, please use for fine-tuning only. Edit heightmap to change actual cell heights'));

    const unit = areaUnit.value === 'square' ? ' ' + distanceUnitInput.value + '²' : ' ' + areaUnit.value;
    const area = pack.features[f].area;
    coastlineArea.innerHTML = si(area * distanceScaleInput.value ** 2) + unit;
  }

  function dragVertex() {
    const x = rn(d3.event.x, 2),
      y = rn(d3.event.y, 2);
    this.setAttribute('cx', x);
    this.setAttribute('cy', y);
    const v = +this.dataset.v;
    pack.vertices.p[v] = [x, y];
    debug
      .select('#vertices')
      .selectAll('polygon')
      .attr('points', (d) => getPackPolygon(d));
    redrawCoastline();
  }

  function redrawCoastline() {
    lineGen.curve(d3.curveBasisClosed);
    const f = +elSelected.attr('data-f');
    const vertices = pack.features[f].vertices;
    const points = clipPoly(
      vertices.map((v) => pack.vertices.p[v]),
      1
    );
    const d = round(lineGen(points));
    elSelected.attr('d', d);
    defs.select('mask#land > path#land_' + f).attr('d', d); // update land mask
    defs.select('mask#water > path#water_' + f).attr('d', d); // update water mask

    const unit = areaUnit.value === 'square' ? ' ' + distanceUnitInput.value + '²' : ' ' + areaUnit.value;
    const area = Math.abs(d3.polygonArea(points));
    coastlineArea.innerHTML = si(area * distanceScaleInput.value ** 2) + unit;
  }

  function showGroupSection() {
    document.querySelectorAll('#coastlineEditor > button').forEach((el) => (el.style.display = 'none'));
    document.getElementById('coastlineGroupsSelection').style.display = 'inline-block';
  }

  function hideGroupSection() {
    document.querySelectorAll('#coastlineEditor > button').forEach((el) => (el.style.display = 'inline-block'));
    document.getElementById('coastlineGroupsSelection').style.display = 'none';
    document.getElementById('coastlineGroupName').style.display = 'none';
    document.getElementById('coastlineGroupName').value = '';
    document.getElementById('coastlineGroup').style.display = 'inline-block';
  }

  function selectCoastlineGroup(node) {
    const group = node.parentNode.id;
    const select = document.getElementById('coastlineGroup');
    select.options.length = 0; // remove all options

    coastline.selectAll('g').each(function () {
      select.options.add(new Option(this.id, this.id, false, this.id === group));
    });
  }

  function changeCoastlineGroup() {
    document.getElementById(this.value).appendChild(elSelected.node());
  }

  function toggleNewGroupInput() {
    if (coastlineGroupName.style.display === 'none') {
      coastlineGroupName.style.display = 'inline-block';
      coastlineGroupName.focus();
      coastlineGroup.style.display = 'none';
    } else {
      coastlineGroupName.style.display = 'none';
      coastlineGroup.style.display = 'inline-block';
    }
  }

  function createNewGroup() {
    if (!this.value) {
      tip('Please provide a valid group name');
      return;
    }
    const group = this.value
      .toLowerCase()
      .replace(/ /g, '_')
      .replace(/[^\w\s]/gi, '');

    if (document.getElementById(group)) {
      tip('Element with this id already exists. Please provide a unique name', false, 'error');
      return;
    }

    if (Number.isFinite(+group.charAt(0))) {
      tip('Group name should start with a letter', false, 'error');
      return;
    }

    // just rename if only 1 element left
    const oldGroup = elSelected.node().parentNode;
    const basic = ['sea_island', 'lake_island'].includes(oldGroup.id);
    if (!basic && oldGroup.childElementCount === 1) {
      document.getElementById('coastlineGroup').selectedOptions[0].remove();
      document.getElementById('coastlineGroup').options.add(new Option(group, group, false, true));
      oldGroup.id = group;
      toggleNewGroupInput();
      document.getElementById('coastlineGroupName').value = '';
      return;
    }

    // create a new group
    const newGroup = elSelected.node().parentNode.cloneNode(false);
    document.getElementById('coastline').appendChild(newGroup);
    newGroup.id = group;
    document.getElementById('coastlineGroup').options.add(new Option(group, group, false, true));
    document.getElementById(group).appendChild(elSelected.node());

    toggleNewGroupInput();
    document.getElementById('coastlineGroupName').value = '';
  }

  function removeCoastlineGroup() {
    const group = elSelected.node().parentNode.id;
    if (['sea_island', 'lake_island'].includes(group)) {
      tip('This is one of the default groups, it cannot be removed', false, 'error');
      return;
    }

    const count = elSelected.node().parentNode.childElementCount;

    const message = `Are you sure you want to remove the group? <br>All coastline elements of the group (${count}) will be moved under <i>sea_island</i> group`;
    const onConfirm = () => {
      const sea = document.getElementById('sea_island');
      const groupEl = document.getElementById(group);
      while (groupEl.childNodes.length) {
        sea.appendChild(groupEl.childNodes[0]);
      }
      groupEl.remove();
      document.getElementById('coastlineGroup').selectedOptions[0].remove();
      document.getElementById('coastlineGroup').value = 'sea_island';
    };
    confirmationDialog({title: 'Remove coastline group', message, confirm: 'Remove', onConfirm});
  }

  function editGroupStyle() {
    const g = elSelected.node().parentNode.id;
    editStyle('coastline', g);
  }

  function closeCoastlineEditor() {
    debug.select('#vertices').remove();
    unselect();
  }
}