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Idiomatic Kotlin Wrapper for The Discord API
There is a newer version: 0.15.0
package dev.kord.core.cache.data

import dev.kord.cache.api.data.DataDescription
import dev.kord.cache.api.data.description
import dev.kord.common.entity.*
import dev.kord.common.entity.optional.*
import kotlinx.datetime.Instant
import kotlinx.serialization.Serializable

@Serializable
public data class MessageData(
    val id: Snowflake,
    val channelId: Snowflake,
    val guildId: OptionalSnowflake = OptionalSnowflake.Missing,
    val author: UserData,
    val content: String,
    val timestamp: Instant,
    val editedTimestamp: Instant? = null,
    val tts: Boolean,
    val mentionEveryone: Boolean,
    val mentions: List,
    val mentionRoles: List,
    val mentionedChannels: Optional> = Optional.Missing(),
    val attachments: List,
    val embeds: List,
    val reactions: Optional> = Optional.Missing(),
    val nonce: Optional = Optional.Missing(),
    val pinned: Boolean,
    val webhookId: OptionalSnowflake = OptionalSnowflake.Missing,
    val type: MessageType,
    val activity: Optional = Optional.Missing(),
    val application: Optional = Optional.Missing(),
    val applicationId: OptionalSnowflake = OptionalSnowflake.Missing,
    val messageReference: Optional = Optional.Missing(),
    val flags: Optional = Optional.Missing(),
    val stickers: Optional> = Optional.Missing(),
    val referencedMessage: Optional = Optional.Missing(),
    val interaction: Optional = Optional.Missing(),
    val components: Optional> = Optional.Missing(),
    val roleSubscriptionData: Optional = Optional.Missing(),
    val position: OptionalInt = OptionalInt.Missing,
) {

    public fun plus(selfId: Snowflake, reaction: MessageReactionAddData): MessageData {
        val isMe = selfId == reaction.userId

        val reactions = if (reactions !is Optional.Value) {
            listOf(ReactionData.from(1, isMe, reaction.emoji))
        } else {
            val reactions = reactions.orEmpty()
            val data = reactions.firstOrNull { data ->
                if (reaction.emoji.id == null) data.emojiName == reaction.emoji.name
                else data.emojiId == reaction.emoji.id && data.emojiName == reaction.emoji.name
            }

            when (data) {
                null -> reactions + ReactionData.from(1, isMe, reaction.emoji)
                else -> (reactions - data) + data.copy(count = data.count + 1, me = isMe)
            }
        }

        return copy(reactions = Optional(reactions))
    }

    public operator fun plus(partialMessage: DiscordPartialMessage): MessageData {

        val editedTimestamp = partialMessage.editedTimestamp.value ?: editedTimestamp
        val content = partialMessage.content.value ?: content
        val mentions = partialMessage.mentions.mapList { it.id }.value ?: mentions
        val mentionEveryone = partialMessage.mentionEveryone.orElse(mentionEveryone)
        val embeds = partialMessage.embeds.mapList { EmbedData.from(it) }.switchOnMissing(embeds).orEmpty()
        val mentionRoles = partialMessage.mentionRoles.mapList { it }.value ?: mentionRoles
        val mentionedChannels =
            partialMessage.mentionedChannels.mapList { it.id }.switchOnMissing(mentionedChannels.value.orEmpty())
                .coerceToMissing()
        val stickers = partialMessage.stickers.mapList { StickerItemData.from(it) }.switchOnMissing(this.stickers)
        val referencedMessage = partialMessage.referencedMessage.mapNullable { it?.toData() ?: referencedMessage.value }
        val interaction =
            partialMessage.interaction.map { MessageInteractionData.from(it) }.switchOnMissing(interaction)

        return MessageData(
            id,
            channelId,
            guildId,
            author,
            content,
            timestamp,
            editedTimestamp,
            tts,
            mentionEveryone,
            mentions,
            mentionRoles,
            mentionedChannels,
            attachments,
            embeds,
            reactions,
            nonce,
            pinned,
            webhookId,
            type,
            activity,
            application,
            applicationId,
            messageReference,
            flags,
            stickers = stickers,
            referencedMessage = referencedMessage,
            interaction = interaction,
            components = components,
            roleSubscriptionData = roleSubscriptionData,
            position = position,
        )
    }

    public companion object {
        public val description: DataDescription = description(MessageData::id)

        public fun from(entity: DiscordMessage): MessageData = with(entity) {
            MessageData(
                id,
                channelId,
                guildId,
                UserData.from(author),
                content,
                timestamp,
                editedTimestamp,
                tts,
                mentionEveryone,
                mentions.map { it.id },
                mentionRoles,
                mentionedChannels.mapList { it.id },
                attachments.map { AttachmentData.from(it) },
                embeds.map { EmbedData.from(it) },
                reactions.mapList { ReactionData.from(it) },
                nonce,
                pinned,
                webhookId,
                type,
                activity,
                application,
                applicationId,
                messageReference.map { MessageReferenceData.from(it) },
                flags,
                stickers.mapList { StickerItemData.from(it) },
                referencedMessage.mapNotNull { from(it) },
                interaction.map { MessageInteractionData.from(it) },
                components = components.mapList { ComponentData.from(it) },
                roleSubscriptionData = roleSubscriptionData,
                position = position,
            )
        }
    }
}

public fun DiscordMessage.toData(): MessageData = MessageData.from(this)