package eu.kanade.presentation.browse

import androidx.compose.foundation.clickable
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.lazy.items
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.verticalScroll
import androidx.compose.material3.AlertDialog
import androidx.compose.material3.RadioButton
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.State
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import eu.kanade.presentation.browse.components.GlobalSearchCardRow
import eu.kanade.presentation.browse.components.GlobalSearchErrorResultItem
import eu.kanade.presentation.browse.components.GlobalSearchLoadingResultItem
import eu.kanade.presentation.browse.components.GlobalSearchResultItem
import eu.kanade.tachiyomi.R
import eu.kanade.tachiyomi.source.CatalogueSource
import eu.kanade.tachiyomi.ui.browse.feed.FeedScreenState
import kotlinx.coroutines.delay
import tachiyomi.domain.manga.model.Manga
import tachiyomi.domain.source.model.FeedSavedSearch
import tachiyomi.domain.source.model.SavedSearch
import tachiyomi.presentation.core.components.ScrollbarLazyColumn
import tachiyomi.presentation.core.components.material.PullRefresh
import tachiyomi.presentation.core.components.material.topSmallPaddingValues
import tachiyomi.presentation.core.screens.EmptyScreen
import tachiyomi.presentation.core.screens.LoadingScreen
import tachiyomi.presentation.core.util.plus
import kotlin.time.Duration.Companion.seconds

data class FeedItemUI(
    val feed: FeedSavedSearch,
    val savedSearch: SavedSearch?,
    val source: CatalogueSource?,
    val title: String,
    val subtitle: String,
    val results: List<Manga>?,
)

@Composable
fun FeedScreen(
    state: FeedScreenState,
    contentPadding: PaddingValues,
    onClickSavedSearch: (SavedSearch, CatalogueSource) -> Unit,
    onClickSource: (CatalogueSource) -> Unit,
    onClickDelete: (FeedSavedSearch) -> Unit,
    onClickManga: (Manga) -> Unit,
    onRefresh: () -> Unit,
    getMangaState: @Composable (Manga, CatalogueSource?) -> State<Manga>,
) {
    when {
        state.isLoading -> LoadingScreen()
        state.isEmpty -> EmptyScreen(
            textResource = R.string.feed_tab_empty,
            modifier = Modifier.padding(contentPadding),
        )
        else -> {
            var refreshing by remember { mutableStateOf(false) }
            LaunchedEffect(refreshing) {
                if (refreshing) {
                    delay(1.seconds)
                    refreshing = false
                }
            }
            PullRefresh(
                refreshing = refreshing && state.isLoadingItems,
                onRefresh = {
                    refreshing = true
                    onRefresh()
                },
                enabled = !state.isLoadingItems,
            ) {
                ScrollbarLazyColumn(
                    contentPadding = contentPadding + topSmallPaddingValues,
                    modifier = Modifier.fillMaxSize(),
                ) {
                    items(
                        state.items.orEmpty(),
                        key = { it.feed.id },
                    ) { item ->
                        GlobalSearchResultItem(
                            modifier = Modifier.animateItemPlacement(),
                            title = item.title,
                            subtitle = item.subtitle,
                            onLongClick = {
                                onClickDelete(item.feed)
                            },
                            onClick = {
                                if (item.savedSearch != null && item.source != null) {
                                    onClickSavedSearch(item.savedSearch, item.source)
                                } else if (item.source != null) {
                                    onClickSource(item.source)
                                }
                            },
                        ) {
                            FeedItem(
                                item = item,
                                getMangaState = { getMangaState(it, item.source) },
                                onClickManga = onClickManga,
                            )
                        }
                    }
                }
            }
        }
    }
}

@Composable
fun FeedItem(
    item: FeedItemUI,
    getMangaState: @Composable ((Manga) -> State<Manga>),
    onClickManga: (Manga) -> Unit,
) {
    when {
        item.results == null -> {
            GlobalSearchLoadingResultItem()
        }
        item.results.isEmpty() -> {
            GlobalSearchErrorResultItem(message = stringResource(R.string.no_results_found))
        }
        else -> {
            GlobalSearchCardRow(
                titles = item.results,
                getManga = getMangaState,
                onClick = onClickManga,
                onLongClick = onClickManga,
            )
        }
    }
}

@Composable
fun FeedAddDialog(
    sources: List<CatalogueSource>,
    onDismiss: () -> Unit,
    onClickAdd: (CatalogueSource?) -> Unit,
) {
    var selected by remember { mutableStateOf<Int?>(null) }
    AlertDialog(
        title = {
            Text(text = stringResource(R.string.feed))
        },
        text = {
            RadioSelector(options = sources, selected = selected) {
                selected = it
            }
        },
        onDismissRequest = onDismiss,
        confirmButton = {
            TextButton(onClick = { onClickAdd(selected?.let { sources[it] }) }) {
                Text(text = stringResource(R.string.action_ok))
            }
        },
    )
}

@Composable
fun FeedAddSearchDialog(
    source: CatalogueSource,
    savedSearches: List<SavedSearch?>,
    onDismiss: () -> Unit,
    onClickAdd: (CatalogueSource, SavedSearch?) -> Unit,
) {
    var selected by remember { mutableStateOf<Int?>(null) }
    AlertDialog(
        title = {
            Text(text = source.name)
        },
        text = {
            val context = LocalContext.current
            val savedSearchStrings = remember {
                savedSearches.map {
                    it?.name ?: context.getString(R.string.latest)
                }
            }
            RadioSelector(
                options = savedSearches,
                optionStrings = savedSearchStrings,
                selected = selected,
            ) {
                selected = it
            }
        },
        onDismissRequest = onDismiss,
        confirmButton = {
            TextButton(onClick = { onClickAdd(source, selected?.let { savedSearches[it] }) }) {
                Text(text = stringResource(R.string.action_ok))
            }
        },
    )
}

@Composable
fun <T> RadioSelector(
    options: List<T>,
    optionStrings: List<String> = remember { options.map { it.toString() } },
    selected: Int?,
    onSelectOption: (Int) -> Unit,
) {
    Column(Modifier.verticalScroll(rememberScrollState())) {
        optionStrings.forEachIndexed { index, option ->
            Row(
                Modifier
                    .fillMaxWidth()
                    .height(48.dp)
                    .clickable { onSelectOption(index) },
                verticalAlignment = Alignment.CenterVertically,
            ) {
                RadioButton(selected == index, onClick = null)
                Spacer(Modifier.width(4.dp))
                Text(option, maxLines = 1)
            }
        }
    }
}

@Composable
fun FeedDeleteConfirmDialog(
    feed: FeedSavedSearch,
    onDismiss: () -> Unit,
    onClickDeleteConfirm: (FeedSavedSearch) -> Unit,
) {
    AlertDialog(
        title = {
            Text(text = stringResource(R.string.feed))
        },
        text = {
            Text(text = stringResource(R.string.feed_delete))
        },
        onDismissRequest = onDismiss,
        confirmButton = {
            TextButton(onClick = { onClickDeleteConfirm(feed) }) {
                Text(text = stringResource(R.string.action_delete))
            }
        },
    )
}