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Graduation
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import * as is from '../is';

const elesfn = {};

function defineSwitchFunction( params ){
  return function(){
    let args = arguments;
    let changedEles = [];

    // e.g. cy.nodes().select( data, handler )
    if( args.length === 2 ){
      let data = args[0];
      let handler = args[1];
      this.on( params.event, data, handler );
    }

    // e.g. cy.nodes().select( handler )
    else if( args.length === 1 && is.fn(args[0]) ){
      let handler = args[0];
      this.on( params.event, handler );
    }

    // e.g. cy.nodes().select()
    // e.g. (private) cy.nodes().select(['tapselect'])
    else if( args.length === 0 || (args.length === 1 && is.array(args[0])) ){
      let addlEvents = args.length === 1 ? args[0] : null;

      for( let i = 0; i < this.length; i++ ){
        let ele = this[ i ];
        let able = !params.ableField || ele._private[ params.ableField ];
        let changed = ele._private[ params.field ] != params.value;

        if( params.overrideAble ){
          let overrideAble = params.overrideAble( ele );

          if( overrideAble !== undefined ){
            able = overrideAble;

            if( !overrideAble ){ return this; } // to save cycles assume not able for all on override
          }
        }

        if( able ){
          ele._private[ params.field ] = params.value;

          if( changed ){
            changedEles.push( ele );
          }
        }
      }

      let changedColl = this.spawn( changedEles );
      changedColl.updateStyle(); // change of state => possible change of style
      changedColl.emit( params.event );

      if( addlEvents ){
        changedColl.emit( addlEvents );
      }
    }

    return this;
  };
}

function defineSwitchSet( params ){
  elesfn[ params.field ] = function(){
    let ele = this[0];

    if( ele ){
      if( params.overrideField ){
        let val = params.overrideField( ele );

        if( val !== undefined ){
          return val;
        }
      }

      return ele._private[ params.field ];
    }
  };

  elesfn[ params.on ] = defineSwitchFunction( {
    event: params.on,
    field: params.field,
    ableField: params.ableField,
    overrideAble: params.overrideAble,
    value: true
  } );

  elesfn[ params.off ] = defineSwitchFunction( {
    event: params.off,
    field: params.field,
    ableField: params.ableField,
    overrideAble: params.overrideAble,
    value: false
  } );
}

defineSwitchSet( {
  field: 'locked',
  overrideField: function( ele ){
    return ele.cy().autolock() ? true : undefined;
  },
  on: 'lock',
  off: 'unlock'
} );

defineSwitchSet( {
  field: 'grabbable',
  overrideField: function( ele ){
    return ele.cy().autoungrabify() || ele.pannable() ? false : undefined;
  },
  on: 'grabify',
  off: 'ungrabify'
} );

defineSwitchSet( {
  field: 'selected',
  ableField: 'selectable',
  overrideAble: function( ele ){
    return ele.cy().autounselectify() ? false : undefined;
  },
  on: 'select',
  off: 'unselect'
} );

defineSwitchSet( {
  field: 'selectable',
  overrideField: function( ele ){
    return ele.cy().autounselectify() ? false : undefined;
  },
  on: 'selectify',
  off: 'unselectify'
} );

elesfn.deselect = elesfn.unselect;

elesfn.grabbed = function(){
  let ele = this[0];
  if( ele ){
    return ele._private.grabbed;
  }
};

defineSwitchSet( {
  field: 'active',
  on: 'activate',
  off: 'unactivate'
} );

defineSwitchSet( {
  field: 'pannable',
  on: 'panify',
  off: 'unpanify'
} );

elesfn.inactive = function(){
  let ele = this[0];
  if( ele ){
    return !ele._private.active;
  }
};

export default elesfn;