var Model = require('mongoose').Model;


function softRemove(schema) {

  if (!schema.path('isRemoved')) {
    schema.add({ isRemoved : { type: Boolean, index: true, default: false } });
  }

  if (!schema.path('removedAt')) {
    schema.add({ removedAt : { type: Date, index: true } });
  }

  schema.static('remove', function(conditions, cb) {
    var softRemove = true;

    if (conditions.$softRemove !== undefined) {
      softRemove = conditions.$softRemove;
      delete conditions.$softRemove;
    }

    if (softRemove === false) {
      return Model.remove.apply(this, arguments);
    }

    this.update(conditions, {
      $set: {
        isRemoved: true,
        removedAt: new Date()
      }
    }, cb);
  });

  schema.static('restore', function(conditions, cb) {
    conditions.isRemoved = true;
    this.update(conditions, {
      $set   : { isRemoved: false },
      $unset : { removedAt: 1 }
    }, cb);
  });

  schema.method('remove', function(cb) {
    this.isRemoved = true;
    this.removedAt = new Date();
    this.save(cb);
  });

  schema.method('restore', function(cb) {
    this.isRemoved = false;
    this.removedAt = undefined;
    this.save(cb);
  });

  var setIsRemoved = function(next) {
    if (this._conditions.isRemoved === undefined) {
      this._conditions.isRemoved = false;
    }
    next(null);
  };

  schema.pre('find'    , setIsRemoved);
  schema.pre('findOne' , setIsRemoved);
}


module.exports = softRemove;