{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schema.api.gov/microsoft-outlook/message",
  "title": "Microsoft Outlook Message",
  "description": "JSON Schema for a Microsoft Graph message resource representing an email message in a user's mailbox. Based on the microsoft.graph.message resource type from the Microsoft Graph v1.0 API.",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Unique identifier for the message. By default, this value changes when the item is moved from one container to another. Use the Prefer: IdType=\"ImmutableId\" header for immutable identifiers.",
      "readOnly": true
    },
    "createdDateTime": {
      "type": "string",
      "format": "date-time",
      "description": "The date and time the message was created. Uses ISO 8601 format in UTC time (e.g., 2014-01-01T00:00:00Z).",
      "readOnly": true
    },
    "lastModifiedDateTime": {
      "type": "string",
      "format": "date-time",
      "description": "The date and time the message was last changed. Uses ISO 8601 format in UTC time.",
      "readOnly": true
    },
    "changeKey": {
      "type": "string",
      "description": "The version of the message.",
      "readOnly": true
    },
    "categories": {
      "type": "array",
      "items": {
        "type": "string"
      },
      "description": "The categories associated with the message."
    },
    "receivedDateTime": {
      "type": "string",
      "format": "date-time",
      "description": "The date and time the message was received. Uses ISO 8601 format in UTC time."
    },
    "sentDateTime": {
      "type": "string",
      "format": "date-time",
      "description": "The date and time the message was sent. Uses ISO 8601 format in UTC time."
    },
    "hasAttachments": {
      "type": "boolean",
      "description": "Indicates whether the message has attachments. This property does not include inline attachments. To verify inline attachments, parse the body property for a src attribute."
    },
    "internetMessageId": {
      "type": "string",
      "description": "The message ID in the format specified by RFC 2822."
    },
    "internetMessageHeaders": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/InternetMessageHeader"
      },
      "description": "A collection of message headers defined by RFC 5322. Includes custom message headers starting with 'x-'. Returned only on applying a $select query option."
    },
    "subject": {
      "type": "string",
      "description": "The subject of the message."
    },
    "body": {
      "$ref": "#/$defs/ItemBody",
      "description": "The body of the message. Can be in HTML or text format."
    },
    "bodyPreview": {
      "type": "string",
      "maxLength": 255,
      "description": "The first 255 characters of the message body in text format.",
      "readOnly": true
    },
    "importance": {
      "type": "string",
      "enum": ["low", "normal", "high"],
      "description": "The importance of the message."
    },
    "parentFolderId": {
      "type": "string",
      "description": "The unique identifier for the message's parent mailFolder."
    },
    "conversationId": {
      "type": "string",
      "description": "The ID of the conversation the email belongs to."
    },
    "conversationIndex": {
      "type": "string",
      "contentEncoding": "base64",
      "description": "Indicates the position of the message within the conversation. Binary value encoded as base64."
    },
    "isDeliveryReceiptRequested": {
      "type": ["boolean", "null"],
      "description": "Indicates whether a delivery receipt is requested for the message."
    },
    "isReadReceiptRequested": {
      "type": "boolean",
      "description": "Indicates whether a read receipt is requested for the message."
    },
    "isRead": {
      "type": "boolean",
      "description": "Indicates whether the message has been read."
    },
    "isDraft": {
      "type": "boolean",
      "description": "Indicates whether the message is a draft. A message is a draft if it has not been sent yet."
    },
    "webLink": {
      "type": "string",
      "format": "uri",
      "description": "The URL to open the message in Outlook on the web. Append ispopout=0 to show in the review pane instead of a popout window.",
      "readOnly": true
    },
    "inferenceClassification": {
      "type": "string",
      "enum": ["focused", "other"],
      "description": "The classification of the message for the user, based on inferred relevance or importance, or on an explicit override."
    },
    "flag": {
      "$ref": "#/$defs/FollowupFlag",
      "description": "The follow-up flag value indicating the status, start date, due date, or completion date for the message."
    },
    "from": {
      "$ref": "#/$defs/Recipient",
      "description": "The owner of the mailbox from which the message is sent. In most cases, this is the same as the sender property, except for sharing or delegation scenarios."
    },
    "sender": {
      "$ref": "#/$defs/Recipient",
      "description": "The account that is used to generate the message. In most cases, this is the same as the from property. Can differ when sending from a shared mailbox or as a delegate."
    },
    "toRecipients": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/Recipient"
      },
      "description": "The To: recipients for the message."
    },
    "ccRecipients": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/Recipient"
      },
      "description": "The Cc: recipients for the message."
    },
    "bccRecipients": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/Recipient"
      },
      "description": "The Bcc: recipients for the message."
    },
    "replyTo": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/Recipient"
      },
      "description": "The email addresses to use when replying."
    },
    "uniqueBody": {
      "$ref": "#/$defs/ItemBody",
      "description": "The part of the body of the message that is unique to the current message. Not returned by default; use $select=uniqueBody."
    },
    "attachments": {
      "type": "array",
      "items": {
        "$ref": "#/$defs/Attachment"
      },
      "description": "The fileAttachment and itemAttachment attachments for the message."
    }
  },
  "$defs": {
    "Recipient": {
      "type": "object",
      "title": "Recipient",
      "description": "Represents information about a user in the context of a message (sender, from, to, cc, bcc, replyTo).",
      "properties": {
        "emailAddress": {
          "$ref": "#/$defs/EmailAddress"
        }
      },
      "required": ["emailAddress"]
    },
    "EmailAddress": {
      "type": "object",
      "title": "Email Address",
      "description": "Represents the name and email address of a person or entity.",
      "properties": {
        "name": {
          "type": "string",
          "description": "The display name of the person or entity."
        },
        "address": {
          "type": "string",
          "format": "email",
          "description": "The email address of the person or entity."
        }
      },
      "required": ["address"]
    },
    "ItemBody": {
      "type": "object",
      "title": "Item Body",
      "description": "Represents the body content of a message, event, or other item.",
      "properties": {
        "contentType": {
          "type": "string",
          "enum": ["text", "html"],
          "description": "The type of the content. Possible values are text and html."
        },
        "content": {
          "type": "string",
          "description": "The content of the item body."
        }
      },
      "required": ["contentType", "content"]
    },
    "InternetMessageHeader": {
      "type": "object",
      "title": "Internet Message Header",
      "description": "A key-value pair representing an Internet message header as defined by RFC 5322. Custom headers should start with 'x-'.",
      "properties": {
        "name": {
          "type": "string",
          "description": "The name of the message header."
        },
        "value": {
          "type": "string",
          "description": "The value for the message header."
        }
      },
      "required": ["name", "value"]
    },
    "FollowupFlag": {
      "type": "object",
      "title": "Follow-up Flag",
      "description": "Represents the follow-up flag status, start date, due date, or completion date for a message.",
      "properties": {
        "flagStatus": {
          "type": "string",
          "enum": ["notFlagged", "complete", "flagged"],
          "description": "The follow-up status for the message."
        },
        "startDateTime": {
          "$ref": "#/$defs/DateTimeTimeZone",
          "description": "The date and time to start the follow up."
        },
        "dueDateTime": {
          "$ref": "#/$defs/DateTimeTimeZone",
          "description": "The date and time the follow up is due."
        },
        "completedDateTime": {
          "$ref": "#/$defs/DateTimeTimeZone",
          "description": "The date and time the follow up was completed."
        }
      },
      "required": ["flagStatus"]
    },
    "DateTimeTimeZone": {
      "type": "object",
      "title": "DateTime with Time Zone",
      "description": "Describes the date, time, and time zone of a point in time.",
      "properties": {
        "dateTime": {
          "type": "string",
          "description": "A single point of time in a combined date and time representation (e.g., 2017-08-29T04:00:00.0000000)."
        },
        "timeZone": {
          "type": "string",
          "description": "Represents a time zone (e.g., Pacific Standard Time). See supported time zones."
        }
      },
      "required": ["dateTime", "timeZone"]
    },
    "Attachment": {
      "type": "object",
      "title": "Attachment",
      "description": "Base type for file, item, and reference attachments on a message. Use @odata.type to distinguish between types.",
      "properties": {
        "@odata.type": {
          "type": "string",
          "enum": [
            "#microsoft.graph.fileAttachment",
            "#microsoft.graph.itemAttachment",
            "#microsoft.graph.referenceAttachment"
          ],
          "description": "The OData type discriminator for the attachment."
        },
        "id": {
          "type": "string",
          "description": "The unique identifier of the attachment.",
          "readOnly": true
        },
        "name": {
          "type": "string",
          "description": "The display name of the attachment. Does not need to be the actual file name."
        },
        "contentType": {
          "type": "string",
          "description": "The MIME type of the attachment."
        },
        "size": {
          "type": "integer",
          "description": "The length of the attachment in bytes."
        },
        "isInline": {
          "type": "boolean",
          "description": "True if the attachment is an inline attachment; otherwise, false."
        },
        "lastModifiedDateTime": {
          "type": "string",
          "format": "date-time",
          "description": "The date and time the attachment was last modified in UTC (ISO 8601)."
        },
        "contentBytes": {
          "type": "string",
          "contentEncoding": "base64",
          "description": "The base64-encoded contents of the file. Only for fileAttachment type."
        },
        "contentId": {
          "type": ["string", "null"],
          "description": "The ID of the attachment in the Exchange store. Only for fileAttachment type."
        },
        "contentLocation": {
          "type": ["string", "null"],
          "description": "The URI corresponding to the location of the content of the attachment."
        }
      },
      "required": ["@odata.type"]
    },
    "MailFolder": {
      "type": "object",
      "title": "Mail Folder",
      "description": "A mail folder in a user's mailbox, such as Inbox and Drafts. Mail folders can contain messages, other Outlook items, and child mail folders.",
      "properties": {
        "id": {
          "type": "string",
          "description": "The unique identifier of the mail folder.",
          "readOnly": true
        },
        "displayName": {
          "type": "string",
          "description": "The mail folder's display name."
        },
        "parentFolderId": {
          "type": "string",
          "description": "The unique identifier for the parent mail folder."
        },
        "childFolderCount": {
          "type": "integer",
          "minimum": 0,
          "description": "The number of immediate child mail folders."
        },
        "unreadItemCount": {
          "type": "integer",
          "minimum": 0,
          "description": "The number of items marked as unread in the folder."
        },
        "totalItemCount": {
          "type": "integer",
          "minimum": 0,
          "description": "The number of items in the folder."
        },
        "isHidden": {
          "type": "boolean",
          "description": "Indicates whether the mail folder is hidden. Can only be set when creating the folder."
        }
      }
    }
  }
}