package eu.kanade.presentation.browse

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.asPaddingValues
import androidx.compose.foundation.layout.navigationBars
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.items
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.input.nestedscroll.NestedScrollConnection
import androidx.compose.ui.input.nestedscroll.nestedScroll
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.style.TextOverflow
import androidx.compose.ui.unit.dp
import eu.kanade.domain.source.model.Source
import eu.kanade.presentation.browse.components.BaseSourceItem
import eu.kanade.presentation.browse.components.SourceIcon
import eu.kanade.presentation.components.EmptyScreen
import eu.kanade.presentation.components.ItemBadges
import eu.kanade.presentation.components.LoadingScreen
import eu.kanade.presentation.components.ScrollbarLazyColumn
import eu.kanade.presentation.theme.header
import eu.kanade.presentation.util.horizontalPadding
import eu.kanade.presentation.util.plus
import eu.kanade.presentation.util.topPaddingValues
import eu.kanade.tachiyomi.R
import eu.kanade.tachiyomi.ui.browse.migration.sources.MigrateSourceState
import eu.kanade.tachiyomi.ui.browse.migration.sources.MigrationSourcesPresenter
import eu.kanade.tachiyomi.util.system.LocaleHelper

@Composable
fun MigrateSourceScreen(
    nestedScrollInterop: NestedScrollConnection,
    presenter: MigrationSourcesPresenter,
    onClickItem: (Source) -> Unit,
    onLongClickItem: (Source) -> Unit,
) {
    val state by presenter.state.collectAsState()
    when (state) {
        is MigrateSourceState.Loading -> LoadingScreen()
        is MigrateSourceState.Error -> Text(text = (state as MigrateSourceState.Error).error.message!!)
        is MigrateSourceState.Success ->
            MigrateSourceList(
                nestedScrollInterop = nestedScrollInterop,
                list = (state as MigrateSourceState.Success).sources,
                onClickItem = onClickItem,
                onLongClickItem = onLongClickItem,
            )
    }
}

@Composable
fun MigrateSourceList(
    nestedScrollInterop: NestedScrollConnection,
    list: List<Pair<Source, Long>>,
    onClickItem: (Source) -> Unit,
    onLongClickItem: (Source) -> Unit,
) {
    if (list.isEmpty()) {
        EmptyScreen(textResource = R.string.information_empty_library)
        return
    }

    ScrollbarLazyColumn(
        modifier = Modifier.nestedScroll(nestedScrollInterop),
        contentPadding = WindowInsets.navigationBars.asPaddingValues() + topPaddingValues,
    ) {
        item(key = "title") {
            Text(
                text = stringResource(R.string.migration_selection_prompt),
                modifier = Modifier
                    .animateItemPlacement()
                    .padding(horizontal = horizontalPadding, vertical = 8.dp),
                style = MaterialTheme.typography.header,
            )
        }

        items(
            items = list,
            key = { (source, _) ->
                source.id
            },
        ) { (source, count) ->
            MigrateSourceItem(
                modifier = Modifier.animateItemPlacement(),
                source = source,
                count = count,
                onClickItem = { onClickItem(source) },
                onLongClickItem = { onLongClickItem(source) },
            )
        }
    }
}

@Composable
fun MigrateSourceItem(
    modifier: Modifier = Modifier,
    source: Source,
    count: Long,
    onClickItem: () -> Unit,
    onLongClickItem: () -> Unit,
) {
    BaseSourceItem(
        modifier = modifier,
        source = source,
        showLanguageInContent = source.lang != "",
        onClickItem = onClickItem,
        onLongClickItem = onLongClickItem,
        icon = { SourceIcon(source = source) },
        action = { ItemBadges(primaryText = "$count") },
        content = { source, showLanguageInContent ->
            Column(
                modifier = Modifier
                    .padding(horizontal = horizontalPadding)
                    .weight(1f),
            ) {
                Text(
                    text = source.name.ifBlank { source.id.toString() },
                    maxLines = 1,
                    overflow = TextOverflow.Ellipsis,
                    style = MaterialTheme.typography.bodyMedium,
                )
                Row(
                    horizontalArrangement = Arrangement.spacedBy(8.dp),
                    verticalAlignment = Alignment.CenterVertically,
                ) {
                    if (showLanguageInContent) {
                        Text(
                            text = LocaleHelper.getDisplayName(source.lang),
                            maxLines = 1,
                            overflow = TextOverflow.Ellipsis,
                            style = MaterialTheme.typography.bodySmall,
                        )
                    }
                    if (source.isStub) {
                        Text(
                            text = stringResource(R.string.not_installed),
                            maxLines = 1,
                            overflow = TextOverflow.Ellipsis,
                            style = MaterialTheme.typography.bodySmall,
                            color = MaterialTheme.colorScheme.error,
                        )
                    }
                }
            }
        },
    )
}