function destroyTable(){

if (openEditChecker()) { return };
$('.delete-table').unbind('click');
$('.delete-table').click(function() {
  $(this).popover('dispose');
  let card = $(this).parents('.card');
  jsPlumb.remove(card);
  let schema = getSchema();
  let table  = schema[card[0].id];
  let status = table.status;
  if (status.new) {
    schema[card[0].id] = null;
  } else {
    status.deleted = true;
  }

  refs = $("li[id^='ref-']");
  for (let i = 0; i < refs.length; i++) {
    let refEl         = $(refs[i]);
    let refID         = $(refs[i])[0].id;
    let foreignCard   = refEl.parents('.card');
    let foreignCardID = foreignCard[0].id;
    let refObj        = schema[foreignCardID].references[refID];

    if (refObj.foreign_table_name === table.name) {
      if (refObj.status.new) {
        refObj = null;
      } else {
        refObj.status.deleted = true;
      }
      jsPlumb.remove(refs[i]);
      jsPlumb.recalculateOffsets(foreignCard);
    }
  }
  setSchema(schema);
});

}

function destroyColumn() {

let schema = getSchema();
if (openEditChecker()) { return }
$('.delete-column').unbind('click')
$('.delete-column').click(function() {
  $(this).popover('dispose');
  let column = $(this).parents("li[id^='col-']")[0];
  let columnID = column.id;
  let card = $(this).parents(".card")[0];
  jsPlumb.remove(column)
  jsPlumb.recalculateOffsets(card)
  let tableID = `tbl-${columnID.split('-')[1]}`;
  let columns = schema[tableID].columns
  let status = columns[columnID].status;
  if (status.new) {
    columns[columnID] = undefined;
  } else {
    status.deleted = true
  }
});
setSchema(schema);

}

function destroyReference() {

if (openEditChecker()) { return };
let schema = getSchema();
$('.delete-ref').unbind('click')
$('.delete-ref').click(function() {
  $(this).popover('dispose');
  let reference = $(this).parents("li[id^='ref-']")[0];
  let referenceID = reference.id;
  let tableID = `tbl-${referenceID.split('-')[1]}`;
  let card = $(this).parents(".card")[0];
  jsPlumb.remove(reference);
  jsPlumb.recalculateOffsets(card)
  let references = schema[tableID].references
  let status = references[referenceID].status;
  if (status.new) {
    references[referenceID] = undefined;
  } else {
    status.deleted = true
  }
});
setSchema(schema);

}

function newColumnObj(tableID, columnName, columnType, schema) {

let tableNum = tableID.split('-')[1];
let prevID = 100;
let columnIDs = Object.keys(schema[`tbl-${tableNum}`].columns);
if (columnIDs.length !== 0) {
  prevID = parseInt(columnIDs[columnIDs.length -1].split('-')[2]);
}
let columnID = `col-${tableNum}-${prevID + 1}`;
return schema[tableID].columns[columnID] = {
  name: columnName,
  original_name: null,
  type: columnType,
  original_type: null,
  id: columnID,
  status: { original: false, modified: false, new: true }
}

}

function newRefObj(tableID,foreignTableName,foreignTableID, schema) {

let tableNum = tableID.split('-')[1];
let prevID = 100;

let columnIDs = Object.keys(schema[`tbl-${tableNum}`].references);
if (columnIDs.length !== 0) {
  prevID = parseInt(columnIDs[columnIDs.length -1].split('-')[2]);
}
let columnID = `ref-${tableNum}-${prevID + 1}`;
return schema[tableID].references[columnID] = {
  id: columnID,
  table_id: tableID,
  foreign_table_name: foreignTableName,
  foreign_table_id: foreignTableID,
  status: { original: false, new: true, deleted: false}
}

}

function addColumnDisplay() {

if (openEditChecker()) { return };
$('.fa-plus-square').unbind('click');
$('.fa-plus-square').on('click', null, {}, displayColumnJumbo);

}

function refColToggle() {

$('#column-reference').change(function(){
  if (this.checked) {
    $('.add-column-card').find('.column-html').addClass('hidden')
    $('.add-column-card').find('.reference-html').removeClass('hidden')
  } else if (!this.checked) {
    $('.add-column-card').find('.reference-html').addClass('hidden')
    $('.add-column-card').find('.column-html').removeClass('hidden')
  }
});

}

function displayColumnJumboExit() {

$('.add-column-card .fa-times').click(function() {
  $('.add-column-card')[0].outerHTML = ""
});

}

function addEmptyTableToSchema(tableName = “table_name”) {

tableID = `tbl-${newTableID}`;

let schema = getSchema();
schema[tableID] = {
  name: tableName,
  original_name: null,
  columns: {},
  references: {},
  status: { original: false, modified: false, new: true, deleted: false },
  id: tableID
};
setSchema(schema);
return schema[tableID]

}

function createNewRef(schema,currentTableHTML) {

let foreignTableName = $('form input#foreign-table-name').val()
let cardIDs          = Object.keys(schema)
for(let i = 0; i < cardIDs.length; i++) {
  if (schema[cardIDs[i]].name === foreignTableName) {
    let referenceRelationship = $('input[name="ref-rel"]:checked').val();
    let foreignTableHTML      = $(`#${cardIDs[i]}`);

    if (referenceRelationship === "mtm" ) {
      let currentTableName         = currentTableHTML.find('h4.table-title').text().trim();
      let joinTableName            = createJoinTableName(currentTableName, foreignTableName);
      for(let i = 0; i < cardIDs.length; i++) {
        if (schema[cardIDs[i]] && schema[cardIDs[i]].name === joinTableName) {
          console.log("already happend")
          return
        }
      }
      let joinTableObj             = addEmptyTableToSchema(joinTableName);
      $('.jsPlumbBoundary').append(tableHTML(joinTableName,500,500));
      let joinTableHTML            = $(`#${joinTableObj.id}`);
      setCardDraggable(joinTableHTML)
      let foreignTableIDColumnHTML = foreignTableHTML.find(`#${foreignTableHTML[0].id}-id-column`);
      let currentTableIDColumnHTML = currentTableHTML.find(`#${currentTableHTML[0].id}-id-column`);
      let currentRefObj            = newRefObj(currentTableHTML[0].id, joinTableName, joinTableObj.id, schema);
      let foreignRefObj            = newRefObj(foreignTableHTML[0].id, joinTableName, joinTableObj.id, schema);
      let joinTableListGroup       = joinTableHTML.find('.list-group');
      joinTableListGroup.append(columnHTML({id: currentRefObj.id, type: "integer", name: `${currentTableName}_id`},"delete-ref"));
      joinTableListGroup.append(columnHTML({id: foreignRefObj.id, type: "integer", name: `${foreignTableName}_id`},"delete-ref"));
      let joinTableCurrentKeyHTML  = $(`#${currentRefObj.id}`)[0];
      let joinTableForeignKeyHTML  = $(`#${foreignRefObj.id}`)[0];
      createConnector(joinTableCurrentKeyHTML,currentTableIDColumnHTML);
      createConnector(joinTableForeignKeyHTML,foreignTableIDColumnHTML);
      newTableID += 1;
    } else {

      let prevRefs = schema[currentTableHTML[0].id].references
      let prevRefKeys = Object.keys(prevRefs)
      let prevStatus  = false
      for(let i = 0; i < prevRefKeys.length; i++) {
        if (prevRefs[prevRefKeys[i]].foreign_table_name === foreignTableName) {
          prevStatus = true
        }
      }
      if (!prevStatus) {
        let foreignKeyHTML = foreignTableHTML.find(`#${foreignTableHTML[0].id}-id-column`);
        let listGroup      = currentTableHTML.find('.list-group');
        let refObj         = newRefObj(currentTableHTML[0].id, foreignTableName, foreignTableHTML[0].id, schema);
        listGroup.append(columnHTML({id: refObj.id, type: "integer", name: `${foreignTableName}_id`},"delete-ref"));
        let newColumnHTML  = $(`#${refObj.id}`)[0]
        createConnector(newColumnHTML,foreignKeyHTML);
      }
      else {
        console.log("already happend")
      }
    }
  }
}

}

function createJoinTableName(firstName, secondName) {

if (firstName < secondName) {
  return `${firstName}_${secondName}`;
} else {
  return `${firstName}_${secondName}`;
}

}

function displayColumnJumbo() {

$('body').append(addColumnCardHTML());
let card = $(this).parents('.card');

refColToggle()
displayColumnJumboExit()
$('form button').click(function() {
  let schema = getSchema();
  let referenceChecked = $('form input#column-reference')[0].checked
  if (referenceChecked) {
    createNewRef(schema,card)
    schema = getSchema()
  } else {
    let columnName = $('form input#column-name').val()
    let columnType = $('form select#column-type-select').val()
    let listGroup = card.find('.list-group');
    let columnObj = newColumnObj(card[0].id, columnName, columnType, schema)
    listGroup.append(columnHTML(columnObj, "delete-column"));
  }
  setSchema(schema);
  $('.add-column-card')[0].outerHTML = ""
  destroyColumn()
  destroyReference()
  return false
})

$('[data-toggle="popover"]').popover();

}

function addColumnCardHTML() {

return "<div class='card add-column-card'>" +
  "<div class='card-header'>" +
    "<h4 class='card-title'>Enter Column Information</h4>" +
    "<i class='fa fa-times' aria-hidden='true'></i>" +
  "</div>" +
  "<div class='card-block'>" +
  "<form>" +
    "<div class='ref-check'>" +
      "<label class='ref-check-label'>" +
        "<input class='ref-check-input' type='checkbox' id='column-reference' value='reference' > reference" +
      "</label>" +
    "</div>" +
    datatypeSelectoHTML() +
    foreignTableRadioButtonHTML() +
    "<div class='form-group'>" +
      "<button type='submit' class='btn btn-primary'>Submit</button>" +
    "</div>" +
  "</form>" +
"</div>" +
"</div>"

}

function foreignTableRadioButtonHTML() {

return "<div class='reference-html hidden'>" +
  "<div class='form-group'>" +
    "<input type='text' class='form-control' id='foreign-table-name' placeholder='foreign table name'>" +
  "</div>" +
  "<div class='form-check'>" +
    "<label class='form-check-label'>" +
      "<input class='form-check-input' type='radio' name='ref-rel' id='ref-rel-mto' value='mto' checked >" +
      " Many to one reference" +
    "</label>" +
  "</div>" +
  "<div class='form-check'>" +
    "<label class='form-check-label'>" +
      "<input class='form-check-input' type='radio' name='ref-rel' id='ref-rel-mto' value='mtm'>" +
      " Many to many reference" +
    "</label>" +
  "</div>" +
"</div>"

}

function datatypeSelectoHTML() {

return "<div class='column-html'>" +
  "<div class='form-group'>" +
    "<input type='text' class='form-control' id='column-name' placeholder='column name'>" +
  "</div>" +
  "<div class='form-group'>" +
    "<label for='column-type-select'>Column Type</label>" +
    "<select id='column-type-select'>" +
      "<option selected>select</option>" +
      "<option value='character'>CHARACTER(n)</option>" +
      "<option value='varchar'>VARCHAR(n)</option>" +
      "<option value='binary'>BINARY(n)</option>" +
      "<option value='boolean'>BOOLEAN</option>" +
      "<option value='varbinary'>VARBINARY(n)</option>" +
      "<option value='integer-precision'>INTEGER(p)</option>" +
      "<option value='smallint'>SMALLINT</option>" +
      "<option value='integer'>INTEGER</option>" +
      "<option value='bigint'>BIGINT</option>" +
      "<option value='decimal'>DECIMAL(p,s)</option>" +
      "<option value='numeric'>NUMERIC(p,s)</option>" +
      "<option value='float'>FLOAT(p)</option>" +
      "<option value='real'>REAL</option>" +
      "<option value='float'>FLOAT</option>" +
      "<option value='date'>DATE</option>" +
      "<option value='time'>TIME</option>" +
      "<option value='timestamp'>TIMESTAMP</option>" +
      "<option value='interval'>INTERVAL</option>" +
      "<option value='array'>ARRAY</option>" +
      "<option value='multiset'>MULTISET</option>" +
      "<option value='xml'>XML</option>" +
    "</select>" +
  "</div>" +
"</div>"

}

function addListeners(){

destroyTable()
editTableName()
addColumnDisplay()
destroyColumn()
destroyReference()
$('[data-toggle="popover"]').popover()

}