amethyst/app/src/main/java/com/vitorpamplona/amethyst/service/NostrChatroomListDataSource.kt

package com.vitorpamplona.amethyst.service

import com.vitorpamplona.amethyst.model.Account
import com.vitorpamplona.amethyst.service.relays.COMMON_FEED_TYPES
import com.vitorpamplona.amethyst.service.relays.EOSEAccount
import com.vitorpamplona.amethyst.service.relays.FeedType
import com.vitorpamplona.amethyst.service.relays.JsonFilter
import com.vitorpamplona.amethyst.service.relays.TypedFilter
import com.vitorpamplona.quartz.events.ChannelCreateEvent
import com.vitorpamplona.quartz.events.ChannelMessageEvent
import com.vitorpamplona.quartz.events.ChannelMetadataEvent
import com.vitorpamplona.quartz.events.PrivateDmEvent

object NostrChatroomListDataSource : NostrDataSource("MailBoxFeed") {
    lateinit var account: Account

    val latestEOSEs = EOSEAccount()
    val chatRoomList = "ChatroomList"

    fun createMessagesToMeFilter() = TypedFilter(
        types = setOf(FeedType.PRIVATE_DMS),
        filter = JsonFilter(
            kinds = listOf(PrivateDmEvent.kind),
            tags = mapOf("p" to listOf(account.userProfile().pubkeyHex)),
            since = latestEOSEs.users[account.userProfile()]?.followList?.get(chatRoomList)?.relayList
        )
    )

    fun createMessagesFromMeFilter() = TypedFilter(
        types = setOf(FeedType.PRIVATE_DMS),
        filter = JsonFilter(
            kinds = listOf(PrivateDmEvent.kind),
            authors = listOf(account.userProfile().pubkeyHex),
            since = latestEOSEs.users[account.userProfile()]?.followList?.get(chatRoomList)?.relayList
        )
    )

    fun createChannelsCreatedbyMeFilter() = TypedFilter(
        types = setOf(FeedType.PUBLIC_CHATS),
        filter = JsonFilter(
            kinds = listOf(ChannelCreateEvent.kind, ChannelMetadataEvent.kind),
            authors = listOf(account.userProfile().pubkeyHex),
            since = latestEOSEs.users[account.userProfile()]?.followList?.get(chatRoomList)?.relayList
        )
    )

    fun createMyChannelsFilter(): TypedFilter {
        val followingEvents = account.selectedChatsFollowList()

        return TypedFilter(
            types = COMMON_FEED_TYPES, // Metadata comes from any relay
            filter = JsonFilter(
                kinds = listOf(ChannelCreateEvent.kind),
                ids = followingEvents.toList(),
                since = latestEOSEs.users[account.userProfile()]?.followList?.get(chatRoomList)?.relayList
            )
        )
    }

    fun createLastChannelInfoFilter(): List<TypedFilter>? {
        val followingEvents = account.selectedChatsFollowList()

        return followingEvents.map {
            TypedFilter(
                types = COMMON_FEED_TYPES, // Metadata comes from any relay
                filter = JsonFilter(
                    kinds = listOf(ChannelMetadataEvent.kind),
                    tags = mapOf("e" to listOf(it)),
                    limit = 1
                )
            )
        }
    }

    fun createLastMessageOfEachChannelFilter(): List<TypedFilter>? {
        val followingEvents = account.selectedChatsFollowList()

        return followingEvents.map {
            TypedFilter(
                types = setOf(FeedType.PUBLIC_CHATS),
                filter = JsonFilter(
                    kinds = listOf(ChannelMessageEvent.kind),
                    tags = mapOf("e" to listOf(it)),
                    since = latestEOSEs.users[account.userProfile()]?.followList?.get(chatRoomList)?.relayList,
                    limit = 50 // Remember to consider spam that is being removed from the UI
                )
            )
        }
    }

    val chatroomListChannel = requestNewChannel { time, relayUrl ->
        latestEOSEs.addOrUpdate(account.userProfile(), chatRoomList, relayUrl, time)
    }

    override fun updateChannelFilters() {
        val list = listOf(
            createMessagesToMeFilter(),
            createMessagesFromMeFilter(),
            createMyChannelsFilter()
        )

        chatroomListChannel.typedFilters = listOfNotNull(
            list,
            createLastChannelInfoFilter(),
            createLastMessageOfEachChannelFilter()
        ).flatten().ifEmpty { null }
    }
}