import {
  assign,
  forEach,
  isArray
} from 'min-dash';

import {
  is
} from '../../util/ModelUtil';

import {
  isExpanded,
  isEventSubProcess
} from '../../util/DiUtil';

import {
  isAny
} from '../modeling/util/ModelingUtil';

import {
  getChildLanes
} from '../modeling/util/LaneUtil';

import {
  hasPrimaryModifier
} from 'diagram-js/lib/util/Mouse';


/**
 * A provider for BPMN 2.0 elements context pad
 */
export default function ContextPadProvider(
    config, injector, eventBus,
    contextPad, modeling, elementFactory,
    connect, create, popupMenu,
    canvas, rules, translate) {

  config = config || {};

  contextPad.registerProvider(this);

  this._contextPad = contextPad;

  this._modeling = modeling;

  this._elementFactory = elementFactory;
  this._connect = connect;
  this._create = create;
  this._popupMenu = popupMenu;
  this._canvas = canvas;
  this._rules = rules;
  this._translate = translate;

  if (config.autoPlace !== false) {
    this._autoPlace = injector.get('autoPlace', false);
  }

  eventBus.on('create.end', 250, function(event) {
    var context = event.context,
        shape = context.shape;

    if (!hasPrimaryModifier(event) || !contextPad.isOpen(shape)) {
      return;
    }

    var entries = contextPad.getEntries(shape);

    if (entries.replace) {
      entries.replace.action.click(event, shape);
    }
  });
}

ContextPadProvider.$inject = [
  'config.contextPad',
  'injector',
  'eventBus',
  'contextPad',
  'modeling',
  'elementFactory',
  'connect',
  'create',
  'popupMenu',
  'canvas',
  'rules',
  'translate'
];


ContextPadProvider.prototype.getContextPadEntries = function(element) {

  var contextPad = this._contextPad,
      modeling = this._modeling,

      elementFactory = this._elementFactory,
      connect = this._connect,
      create = this._create,
      popupMenu = this._popupMenu,
      canvas = this._canvas,
      rules = this._rules,
      autoPlace = this._autoPlace,
      translate = this._translate;

  var actions = {};

  if (element.type === 'label') {
    return actions;
  }

  var businessObject = element.businessObject;

  function startConnect(event, element) {
    connect.start(event, element);
  }

  function removeElement(e) {
    modeling.removeElements([ element ]);
  }

  function getReplaceMenuPosition(element) {

    var Y_OFFSET = 5;

    var diagramContainer = canvas.getContainer(),
        pad = contextPad.getPad(element).html;

    var diagramRect = diagramContainer.getBoundingClientRect(),
        padRect = pad.getBoundingClientRect();

    var top = padRect.top - diagramRect.top;
    var left = padRect.left - diagramRect.left;

    var pos = {
      x: left,
      y: top + padRect.height + Y_OFFSET
    };

    return pos;
  }


  /**
   * Create an append action
   *
   * @param {string} type
   * @param {string} className
   * @param {string} [title]
   * @param {Object} [options]
   *
   * @return {Object} descriptor
   */
  function appendAction(type, className, title, options) {

    if (typeof title !== 'string') {
      options = title;
      title = translate('Append {type}', { type: type.replace(/^bpmn:/, '') });
    }

    function appendStart(event, element) {

      var shape = elementFactory.createShape(assign({ type: type }, options));
      create.start(event, shape, {
        source: element
      });
    }


    var append = autoPlace ? function(event, element) {
      var shape = elementFactory.createShape(assign({ type: type }, options));

      autoPlace.append(element, shape);
    } : appendStart;


    return {
      group: 'model',
      className: className,
      title: title,
      action: {
        dragstart: appendStart,
        click: append
      }
    };
  }

  function splitLaneHandler(count) {

    return function(event, element) {

      // actual split
      modeling.splitLane(element, count);

      // refresh context pad after split to
      // get rid of split icons
      contextPad.open(element, true);
    };
  }


  if (isAny(businessObject, [ 'bpmn:Lane', 'bpmn:Participant' ]) && isExpanded(businessObject)) {

    var childLanes = getChildLanes(element);

    assign(actions, {
      'lane-insert-above': {
        group: 'lane-insert-above',
        className: 'bpmn-icon-lane-insert-above',
        title: translate('Add Lane above'),
        action: {
          click: function(event, element) {
            modeling.addLane(element, 'top');
          }
        }
      }
    });

    if (childLanes.length < 2) {

      if (element.height >= 120) {
        assign(actions, {
          'lane-divide-two': {
            group: 'lane-divide',
            className: 'bpmn-icon-lane-divide-two',
            title: translate('Divide into two Lanes'),
            action: {
              click: splitLaneHandler(2)
            }
          }
        });
      }

      if (element.height >= 180) {
        assign(actions, {
          'lane-divide-three': {
            group: 'lane-divide',
            className: 'bpmn-icon-lane-divide-three',
            title: translate('Divide into three Lanes'),
            action: {
              click: splitLaneHandler(3)
            }
          }
        });
      }
    }

    assign(actions, {
      'lane-insert-below': {
        group: 'lane-insert-below',
        className: 'bpmn-icon-lane-insert-below',
        title: translate('Add Lane below'),
        action: {
          click: function(event, element) {
            modeling.addLane(element, 'bottom');
          }
        }
      }
    });

  }

  if (is(businessObject, 'bpmn:FlowNode')) {

    if (is(businessObject, 'bpmn:EventBasedGateway')) {

      assign(actions, {
        'append.receive-task': appendAction(
          'bpmn:ReceiveTask',
          'bpmn-icon-receive-task',
          translate('Append ReceiveTask')
        ),
        'append.message-intermediate-event': appendAction(
          'bpmn:IntermediateCatchEvent',
          'bpmn-icon-intermediate-event-catch-message',
          translate('Append MessageIntermediateCatchEvent'),
          { eventDefinitionType: 'bpmn:MessageEventDefinition' }
        ),
        'append.timer-intermediate-event': appendAction(
          'bpmn:IntermediateCatchEvent',
          'bpmn-icon-intermediate-event-catch-timer',
          translate('Append TimerIntermediateCatchEvent'),
          { eventDefinitionType: 'bpmn:TimerEventDefinition' }
        ),
        'append.condition-intermediate-event': appendAction(
          'bpmn:IntermediateCatchEvent',
          'bpmn-icon-intermediate-event-catch-condition',
          translate('Append ConditionIntermediateCatchEvent'),
          { eventDefinitionType: 'bpmn:ConditionalEventDefinition' }
        ),
        'append.signal-intermediate-event': appendAction(
          'bpmn:IntermediateCatchEvent',
          'bpmn-icon-intermediate-event-catch-signal',
          translate('Append SignalIntermediateCatchEvent'),
          { eventDefinitionType: 'bpmn:SignalEventDefinition' }
        )
      });
    } else

    if (isEventType(businessObject, 'bpmn:BoundaryEvent', 'bpmn:CompensateEventDefinition')) {

      assign(actions, {
        'append.compensation-activity':
            appendAction(
              'bpmn:Task',
              'bpmn-icon-task',
              translate('Append compensation activity'),
              {
                isForCompensation: true
              }
            )
      });
    } else

    if (!is(businessObject, 'bpmn:EndEvent') &&
        !businessObject.isForCompensation &&
        !isEventType(businessObject, 'bpmn:IntermediateThrowEvent', 'bpmn:LinkEventDefinition') &&
        !isEventSubProcess(businessObject)) {

      assign(actions, {
        'append.end-event': appendAction(
          'bpmn:EndEvent',
          'bpmn-icon-end-event-none',
          translate('Append EndEvent')
        ),
        'append.gateway': appendAction(
          'bpmn:ExclusiveGateway',
          'bpmn-icon-gateway-none',
          translate('Append Gateway')
        ),
        'append.append-task': appendAction(
          'bpmn:Task',
          'bpmn-icon-task',
          translate('Append Task')
        ),
        'append.intermediate-event': appendAction(
          'bpmn:IntermediateThrowEvent',
          'bpmn-icon-intermediate-event-none',
          translate('Append Intermediate/Boundary Event')
        )
      });
    }
  }

  if (!popupMenu.isEmpty(element, 'bpmn-replace')) {

    // Replace menu entry
    assign(actions, {
      'replace': {
        group: 'edit',
        className: 'bpmn-icon-screw-wrench',
        title: translate('Change type'),
        action: {
          click: function(event, element) {

            var position = assign(getReplaceMenuPosition(element), {
              cursor: { x: event.x, y: event.y }
            });

            popupMenu.open(element, 'bpmn-replace', position);
          }
        }
      }
    });
  }

  if (isAny(businessObject, [
    'bpmn:FlowNode',
    'bpmn:InteractionNode',
    'bpmn:DataObjectReference',
    'bpmn:DataStoreReference'
  ])) {

    assign(actions, {
      'append.text-annotation': appendAction('bpmn:TextAnnotation', 'bpmn-icon-text-annotation'),

      'connect': {
        group: 'connect',
        className: 'bpmn-icon-connection-multi',
        title: translate('Connect using ' +
                  (businessObject.isForCompensation ? '' : 'Sequence/MessageFlow or ') +
                  'Association'),
        action: {
          click: startConnect,
          dragstart: startConnect
        }
      }
    });
  }

  if (isAny(businessObject, [ 'bpmn:DataObjectReference', 'bpmn:DataStoreReference' ])) {
    assign(actions, {
      'connect': {
        group: 'connect',
        className: 'bpmn-icon-connection-multi',
        title: translate('Connect using DataInputAssociation'),
        action: {
          click: startConnect,
          dragstart: startConnect
        }
      }
    });
  }

  if (is(businessObject, 'bpmn:Group')) {
    assign(actions, {
      'append.text-annotation': appendAction('bpmn:TextAnnotation', 'bpmn-icon-text-annotation')
    });
  }

  // delete element entry, only show if allowed by rules
  var deleteAllowed = rules.allowed('elements.delete', { elements: [ element ] });

  if (isArray(deleteAllowed)) {

    // was the element returned as a deletion candidate?
    deleteAllowed = deleteAllowed[0] === element;
  }

  if (deleteAllowed) {
    assign(actions, {
      'delete': {
        group: 'edit',
        className: 'bpmn-icon-trash',
        title: translate('Remove'),
        action: {
          click: removeElement
        }
      }
    });
  }

  return actions;
};


// helpers /////////

function isEventType(eventBo, type, definition) {

  var isType = eventBo.$instanceOf(type);
  var isDefinition = false;

  var definitions = eventBo.eventDefinitions || [];
  forEach(definitions, function(def) {
    if (def.$type === definition) {
      isDefinition = true;
    }
  });

  return isType && isDefinition;
}