"""
Copyright (c) Microsoft Corporation. All rights reserved.
Licensed under the MIT License.
"""

from datetime import datetime
from typing import Any, List, Literal, Optional

from ...models import ActivityBase, Attachment, AttachmentLayout, ChannelData
from ...models.custom_base_model import CustomBaseModel

MessageEventType = Literal["undeleteMessage", "editMessage"]


class MessageUpdateChannelData(ChannelData):
    """Channel data specific to message update activities."""

    event_type: MessageEventType  # pyright: ignore [reportGeneralTypeIssues]
    """The type of event for message update."""


class _MessageUpdateBase(CustomBaseModel):
    """Base class containing shared message update activity fields (all Optional except type)."""

    type: Literal["messageUpdate"] = "messageUpdate"

    text: Optional[str] = None
    """The text content of the message."""

    speak: Optional[str] = None
    """The text to speak."""

    summary: Optional[str] = None
    """The text to display if the channel cannot render cards."""

    attachment_layout: Optional[AttachmentLayout] = None
    """The layout hint for multiple attachments. Optional, omitted when not provided."""

    attachments: Optional[List[Attachment]] = None
    """Attachments included in the updated message."""

    expiration: Optional[datetime] = None
    """
    The time at which the activity should be considered to be "expired"
    and should not be presented to the recipient.
    """

    value: Optional[Any] = None
    """A value that is associated with the activity."""

    channel_data: Optional[MessageUpdateChannelData] = None
    """Channel-specific data for message update events."""


class MessageUpdateActivity(_MessageUpdateBase, ActivityBase):
    """Output model for received message update activities with required fields and read-only properties."""

    text: str = ""  # pyright: ignore [reportGeneralTypeIssues, reportIncompatibleVariableOverride]
    """The text content of the message."""

    channel_data: MessageUpdateChannelData  # pyright: ignore [reportGeneralTypeIssues]
    """Channel-specific data for message update events."""