amethyst/app/src/main/java/com/vitorpamplona/amethyst/ui/navigation/Routes.kt

package com.vitorpamplona.amethyst.ui.navigation

import android.content.Context
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.livedata.observeAsState
import androidx.compose.ui.platform.LocalContext
import androidx.navigation.NamedNavArgument
import androidx.navigation.NavBackStackEntry
import androidx.navigation.NavController
import androidx.navigation.NavHostController
import androidx.navigation.NavType
import androidx.navigation.compose.currentBackStackEntryAsState
import androidx.navigation.navArgument
import com.vitorpamplona.amethyst.NotificationCache
import com.vitorpamplona.amethyst.R
import com.vitorpamplona.amethyst.model.Account
import com.vitorpamplona.amethyst.ui.dal.ChatroomListKnownFeedFilter
import com.vitorpamplona.amethyst.ui.dal.HomeNewThreadFeedFilter
import com.vitorpamplona.amethyst.ui.dal.NotificationFeedFilter
import com.vitorpamplona.amethyst.ui.screen.AccountStateViewModel
import com.vitorpamplona.amethyst.ui.screen.ChannelScreen
import com.vitorpamplona.amethyst.ui.screen.ChatroomListScreen
import com.vitorpamplona.amethyst.ui.screen.ChatroomScreen
import com.vitorpamplona.amethyst.ui.screen.FiltersScreen
import com.vitorpamplona.amethyst.ui.screen.HomeScreen
import com.vitorpamplona.amethyst.ui.screen.NotificationScreen
import com.vitorpamplona.amethyst.ui.screen.ProfileScreen
import com.vitorpamplona.amethyst.ui.screen.SearchScreen
import com.vitorpamplona.amethyst.ui.screen.ThreadScreen
import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel


sealed class Route(
    val route: String,
    val icon: Int,
    val hasNewItems: (Account, NotificationCache, Context) -> Boolean = { _,_,_ -> false },
    val arguments: List<NamedNavArgument> = emptyList(),
    val buildScreen: (AccountViewModel, AccountStateViewModel, NavController) -> @Composable (NavBackStackEntry) -> Unit
) {
    object Home : Route("Home", R.drawable.ic_home,
        hasNewItems = { acc, cache, ctx -> homeHasNewItems(acc, cache, ctx) },
        buildScreen = { acc, accSt, nav -> { _ -> HomeScreen(acc, nav) } }
    )
    object Search : Route("Search", R.drawable.ic_search,
        buildScreen = { acc, accSt, nav -> { _ -> SearchScreen(acc, nav) }}
    )
    object Notification : Route("Notification", R.drawable.ic_notifications,
        hasNewItems = { acc, cache, ctx -> notificationHasNewItems(acc, cache, ctx) },
        buildScreen = { acc, accSt, nav -> { _ -> NotificationScreen(acc, nav) }}
    )

    object Message : Route("Message", R.drawable.ic_dm,
        hasNewItems = { acc, cache, ctx -> messagesHasNewItems(acc, cache, ctx) },
        buildScreen = { acc, accSt, nav -> { _ -> ChatroomListScreen(acc, nav) }}
    )

    object Filters : Route("Filters", R.drawable.ic_dm,
        buildScreen = { acc, accSt, nav -> { _ -> FiltersScreen(acc, nav) }}
    )

    object Profile : Route("User/{id}", R.drawable.ic_profile,
        arguments = listOf(navArgument("id") { type = NavType.StringType } ),
        buildScreen = { acc, accSt, nav -> { ProfileScreen(it.arguments?.getString("id"), acc, nav) }}
    )

    object Note : Route("Note/{id}", R.drawable.ic_moments,
        arguments = listOf(navArgument("id") { type = NavType.StringType } ),
        buildScreen = { acc, accSt, nav -> { ThreadScreen(it.arguments?.getString("id"), acc, nav) }}
    )

    object Room : Route("Room/{id}", R.drawable.ic_moments,
        arguments = listOf(navArgument("id") { type = NavType.StringType } ),
        buildScreen = { acc, accSt, nav -> { ChatroomScreen(it.arguments?.getString("id"), acc, nav) }}
    )

    object Channel : Route("Channel/{id}", R.drawable.ic_moments,
        arguments = listOf(navArgument("id") { type = NavType.StringType } ),
        buildScreen = { acc, accSt, nav -> { ChannelScreen(it.arguments?.getString("id"), acc, accSt, nav) }}
    )
}

val Routes = listOf(
    // bottom
    Route.Home,
    Route.Message,
    Route.Search,
    Route.Notification,

    //drawer
    Route.Profile,
    Route.Note,
    Route.Room,
    Route.Channel,
    Route.Filters
)

//**
//*  Functions below only exist because we have not broken the datasource classes into backend and frontend.
//**
@Composable
public fun currentRoute(navController: NavHostController): String? {
    val navBackStackEntry by navController.currentBackStackEntryAsState()
    return navBackStackEntry?.destination?.route
}

private fun homeHasNewItems(account: Account, cache: NotificationCache, context: Context): Boolean {
    val lastTime = cache.load("HomeFollows", context)

    HomeNewThreadFeedFilter.account = account

    return HomeNewThreadFeedFilter.feed().any {(it.event?.createdAt ?: 0) > lastTime }
}

private fun notificationHasNewItems(account: Account, cache: NotificationCache, context: Context): Boolean {
    val lastTime = cache.load("Notification", context)

    NotificationFeedFilter.account = account

    return NotificationFeedFilter.feed().any {(it.event?.createdAt ?: 0) > lastTime }
}

private fun messagesHasNewItems(account: Account, cache: NotificationCache, context: Context): Boolean {
    ChatroomListKnownFeedFilter.account = account

    return ChatroomListKnownFeedFilter.feed().any {
        if (it.channel == null && it.author != account.userProfile()) {
            val lastTime = cache.load("Room/${it.author?.pubkeyHex}", context)

            (it.event?.createdAt ?: 0) > lastTime
        } else {
            false
        }
    }
}