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app.handle('Option', conv => {
  // Note: 'prompt_option' is the name of the slot.
  const selectedOption = conv.session.params.prompt_option;
  conv.add(`You selected ${selectedOption}.`);
});

{
  "responseJson": {
    "session": {
      "id": "session_id",
      "params": {
        "prompt_option": "ITEM_1"
      }
    },
    "prompt": {
      "override": false,
      "firstSimple": {
        "speech": "You selected ITEM_1.",
        "text": "You selected ITEM_1."
      }
    }
  }
}

const ASSISTANT_LOGO_IMAGE = new Image({
  url: 'https://developers.google.com/assistant/assistant_96.png',
  alt: 'Google Assistant logo'
});

app.handle('List', conv => {
  conv.add('This is a list.');

  // Override type based on slot 'prompt_option'
  conv.session.typeOverrides = [{
    name: 'prompt_option',
    mode: 'TYPE_REPLACE',
    synonym: {
      entries: [
        {
          name: 'ITEM_1',
          synonyms: ['Item 1', 'First item'],
          display: {
             title: 'Item #1',
             description: 'Description of Item #1',
             image: ASSISTANT_LOGO_IMAGE,
                }
        },
        {
          name: 'ITEM_2',
          synonyms: ['Item 2', 'Second item'],
          display: {
             title: 'Item #2',
             description: 'Description of Item #2',
             image: ASSISTANT_LOGO_IMAGE,
                }
        },
        {
          name: 'ITEM_3',
          synonyms: ['Item 3', 'Third item'],
          display: {
             title: 'Item #3',
             description: 'Description of Item #3',
             image: ASSISTANT_LOGO_IMAGE,
                }
        },
        {
          name: 'ITEM_4',
          synonyms: ['Item 4', 'Fourth item'],
          display: {
             title: 'Item #4',
             description: 'Description of Item #4',
             image: ASSISTANT_LOGO_IMAGE,
                }
        },
        ]
    }
  }];

  // Define prompt content using keys
  conv.add(new List({
    title: 'List title',
    subtitle: 'List subtitle',
    items: [
      {
        key: 'ITEM_1'
      },
      {
        key: 'ITEM_2'
      },
      {
        key: 'ITEM_3'
      },
      {
        key: 'ITEM_4'
      }
    ],
  }));
});

{
 "responseJson": {
   "session": {
     "id": "session_id",
     "params": {},
     "typeOverrides": [
       {
         "name": "prompt_option",
         "synonym": {
           "entries": [
             {
               "name": "ITEM_1",
               "synonyms": [
                 "Item 1",
                 "First item"
               ],
               "display": {
                 "title": "Item #1",
                 "description": "Description of Item #1",
                 "image": {
                   "alt": "Google Assistant logo",
                   "height": 0,
                   "url": "https://developers.google.com/assistant/assistant_96.png",
                   "width": 0
                 }
               }
             },
             {
               "name": "ITEM_2",
               "synonyms": [
                 "Item 2",
                 "Second item"
               ],
               "display": {
                 "title": "Item #2",
                 "description": "Description of Item #2",
                 "image": {
                   "alt": "Google Assistant logo",
                   "height": 0,
                   "url": "https://developers.google.com/assistant/assistant_96.png",
                   "width": 0
                 }
               }
             },
             {
               "name": "ITEM_3",
               "synonyms": [
                 "Item 3",
                 "Third item"
               ],
               "display": {
                 "title": "Item #3",
                 "description": "Description of Item #3",
                 "image": {
                   "alt": "Google Assistant logo",
                   "height": 0,
                   "url": "https://developers.google.com/assistant/assistant_96.png",
                   "width": 0
                 }
               }
             },
             {
               "name": "ITEM_4",
               "synonyms": [
                 "Item 4",
                 "Fourth item"
               ],
               "display": {
                 "title": "Item #4",
                 "description": "Description of Item #4",
                 "image": {
                   "alt": "Google Assistant logo",
                   "height": 0,
                   "url": "https://developers.google.com/assistant/assistant_96.png",
                   "width": 0
                 }
               }
             }
           ]
         },
         "typeOverrideMode": "TYPE_REPLACE"
       }
     ]
   },
   "prompt": {
     "override": false,
     "content": {
       "list": {
         "items": [
           {
             "key": "ITEM_1"
           },
           {
             "key": "ITEM_2"
           },
           {
             "key": "ITEM_3"
           },
           {
             "key": "ITEM_4"
           }
         ],
         "subtitle": "List subtitle",
         "title": "List title"
       }
     },
     "firstSimple": {
       "speech": "This is a list.",
       "text": "This is a list."
     }
   }
 }
}

const ASSISTANT_LOGO_IMAGE = new Image({
  url: 'https://developers.google.com/assistant/assistant_96.png',
  alt: 'Google Assistant logo'
});

app.handle('Collection', conv => {
  conv.add("This is a collection.");

  // Override type based on slot 'prompt_option'
  conv.session.typeOverrides = [{
    name: 'prompt_option',
    mode: 'TYPE_REPLACE',
    synonym: {
      entries: [
        {
          name: 'ITEM_1',
          synonyms: ['Item 1', 'First item'],
          display: {
             title: 'Item #1',
             description: 'Description of Item #1',
             image: ASSISTANT_LOGO_IMAGE,
                }
        },
        {
          name: 'ITEM_2',
          synonyms: ['Item 2', 'Second item'],
          display: {
             title: 'Item #2',
             description: 'Description of Item #2',
             image: ASSISTANT_LOGO_IMAGE,
                }
        },
        {
          name: 'ITEM_3',
          synonyms: ['Item 3', 'Third item'],
          display: {
             title: 'Item #3',
             description: 'Description of Item #3',
             image: ASSISTANT_LOGO_IMAGE,
                }
        },
        {
          name: 'ITEM_4',
          synonyms: ['Item 4', 'Fourth item'],
          display: {
             title: 'Item #4',
             description: 'Description of Item #4',
             image: ASSISTANT_LOGO_IMAGE,
                }
        },
        ]
    }
  }];

  // Define prompt content using keys
  conv.add(new Collection({
    title: 'Collection Title',
    subtitle: 'Collection subtitle',
    items: [
      {
        key: 'ITEM_1'
      },
      {
        key: 'ITEM_2'
      },
      {
        key: 'ITEM_3'
      },
      {
        key: 'ITEM_4'
      }
    ],
  }));
});

{
  "responseJson": {
    "session": {
      "id": "ABwppHHz--uQEEy3CCOANyB0J58oF2Yw5JEX0oXwit3uxDlRwzbEIK3Bcz7hXteE6hWovrLX9Ahpqu8t-jYnQRFGpAUqSuYjZ70",
      "params": {},
      "typeOverrides": [
        {
          "name": "prompt_option",
          "synonym": {
            "entries": [
              {
                "name": "ITEM_1",
                "synonyms": [
                  "Item 1",
                  "First item"
                ],
                "display": {
                  "title": "Item #1",
                  "description": "Description of Item #1",
                  "image": {
                    "alt": "Google Assistant logo",
                    "height": 0,
                    "url": "https://developers.google.com/assistant/assistant_96.png",
                    "width": 0
                  }
                }
              },
              {
                "name": "ITEM_2",
                "synonyms": [
                  "Item 2",
                  "Second item"
                ],
                "display": {
                  "title": "Item #2",
                  "description": "Description of Item #2",
                  "image": {
                    "alt": "Google Assistant logo",
                    "height": 0,
                    "url": "https://developers.google.com/assistant/assistant_96.png",
                    "width": 0
                  }
                }
              },
              {
                "name": "ITEM_3",
                "synonyms": [
                  "Item 3",
                  "Third item"
                ],
                "display": {
                  "title": "Item #3",
                  "description": "Description of Item #3",
                  "image": {
                    "alt": "Google Assistant logo",
                    "height": 0,
                    "url": "https://developers.google.com/assistant/assistant_96.png",
                    "width": 0
                  }
                }
              },
              {
                "name": "ITEM_4",
                "synonyms": [
                  "Item 4",
                  "Fourth item"
                ],
                "display": {
                  "title": "Item #4",
                  "description": "Description of Item #4",
                  "image": {
                    "alt": "Google Assistant logo",
                    "height": 0,
                    "url": "https://developers.google.com/assistant/assistant_96.png",
                    "width": 0
                  }
                }
              }
            ]
          },
          "typeOverrideMode": "TYPE_REPLACE"
        }
      ]
    },
    "prompt": {
      "override": false,
      "content": {
        "collection": {
          "imageFill": "UNSPECIFIED",
          "items": [
            {
              "key": "ITEM_1"
            },
            {
              "key": "ITEM_2"
            },
            {
              "key": "ITEM_3"
            },
            {
              "key": "ITEM_4"
            }
          ],
          "subtitle": "Collection subtitle",
          "title": "Collection Title"
        }
      },
      "firstSimple": {
        "speech": "This is a collection.",
        "text": "This is a collection."
      }
    }
  }
}

candidates:
  - first_simple:
      variants:
        - speech: This is a collection browse.
    content:
      collection_browse:
        items:
          - title: Item #1
            description: Description of Item #1
            footer: Footer of Item #1
            image:
              url: 'https://developers.google.com/assistant/assistant_96.png'
            open_uri_action:
              url: 'https://www.example.com'
          - title: Item #2
            description: Description of Item #2
            footer: Footer of Item #2
            image:
              url:  'https://developers.google.com/assistant/assistant_96.png'
            open_uri_action:
              url: 'https://www.example.com'
        image_fill: WHITE

{
 "candidates": [
   {
     "firstSimple": {
       "speech": "This is a collection browse.",
       "text": "This is a collection browse."
     },
     "content": {
       "collectionBrowse": {
         "items": [
           {
             "title": "Item #1",
             "description": "Description of Item #1",
             "footer": "Footer of Item #1",
             "image": {
               "url": "https://developers.google.com/assistant/assistant_96.png"
             },
             "openUriAction": {
               "url": "https://www.example.com"
             }
           },
           {
             "title": "Item #2",
             "description": "Description of Item #2",
             "footer": "Footer of Item #2",
             "image": {
               "url": "https://developers.google.com/assistant/assistant_96.png"
             },
             "openUriAction": {
               "url": "https://www.example.com"
             }
           }
         ],
         "imageFill": "WHITE"
       }
     }
   }
 ]
}

// Collection Browse
app.handle('collectionBrowse', (conv) => {
  conv.add('This is a collection browse.');
  conv.add(new CollectionBrowse({
    'imageFill': 'WHITE',
    'items':
      [
        {
          'title': 'Item #1',
          'description': 'Description of Item #1',
          'footer': 'Footer of Item #1',
          'image': {
            'url': 'https://developers.google.com/assistant/assistant_96.png'
          },
          'openUriAction': {
            'url': 'https://www.example.com'
          }
        },
        {
          'title': 'Item #2',
          'description': 'Description of Item #2',
          'footer': 'Footer of Item #2',
          'image': {
            'url': 'https://developers.google.com/assistant/assistant_96.png'
          },
          'openUriAction': {
            'url': 'https://www.example.com'
          }
        }
      ]
  }));
});

{
  "responseJson": {
    "session": {
      "id": "session_id",
      "params": {},
      "languageCode": ""
    },
    "prompt": {
      "override": false,
      "content": {
        "collectionBrowse": {
          "imageFill": "WHITE",
          "items": [
            {
              "title": "Item #1",
              "description": "Description of Item #1",
              "footer": "Footer of Item #1",
              "image": {
                "url": "https://developers.google.com/assistant/assistant_96.png"
              },
              "openUriAction": {
                "url": "https://www.example.com"
              }
            },
            {
              "title": "Item #2",
              "description": "Description of Item #2",
              "footer": "Footer of Item #2",
              "image": {
                "url": "https://developers.google.com/assistant/assistant_96.png"
              },
              "openUriAction": {
                "url": "https://www.example.com"
              }
            }
          ]
        }
      },
      "firstSimple": {
        "speech": "This is a collection browse.",
        "text": "This is a collection browse."
      }
    }
  }
}