package eu.kanade.presentation.browse

import android.util.DisplayMetrics
import androidx.annotation.StringRes
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.WindowInsets
import androidx.compose.foundation.layout.asPaddingValues
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.navigationBars
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.layout.width
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.outlined.Settings
import androidx.compose.material3.AlertDialog
import androidx.compose.material3.Button
import androidx.compose.material3.Divider
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.OutlinedButton
import androidx.compose.material3.Switch
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
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.input.nestedscroll.NestedScrollConnection
import androidx.compose.ui.input.nestedscroll.nestedScroll
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.dp
import eu.kanade.presentation.browse.components.ExtensionIcon
import eu.kanade.presentation.components.DIVIDER_ALPHA
import eu.kanade.presentation.components.Divider
import eu.kanade.presentation.components.EmptyScreen
import eu.kanade.presentation.components.PreferenceRow
import eu.kanade.presentation.util.horizontalPadding
import eu.kanade.tachiyomi.R
import eu.kanade.tachiyomi.extension.model.Extension
import eu.kanade.tachiyomi.source.ConfigurableSource
import eu.kanade.tachiyomi.ui.browse.extension.details.ExtensionDetailsPresenter
import eu.kanade.tachiyomi.ui.browse.extension.details.ExtensionSourceItem
import eu.kanade.tachiyomi.util.system.LocaleHelper

@Composable
fun ExtensionDetailsScreen(
    nestedScrollInterop: NestedScrollConnection,
    presenter: ExtensionDetailsPresenter,
    onClickUninstall: () -> Unit,
    onClickAppInfo: () -> Unit,
    onClickSourcePreferences: (sourceId: Long) -> Unit,
    onClickSource: (sourceId: Long) -> Unit,
) {
    val extension = presenter.extension

    if (extension == null) {
        EmptyScreen(textResource = R.string.empty_screen)
        return
    }

    val sources by presenter.sourcesState.collectAsState()

    var showNsfwWarning by remember { mutableStateOf(false) }

    LazyColumn(
        modifier = Modifier.nestedScroll(nestedScrollInterop),
        contentPadding = WindowInsets.navigationBars.asPaddingValues(),
    ) {
        when {
            extension.isUnofficial ->
                item {
                    WarningBanner(R.string.unofficial_extension_message)
                }
            extension.isObsolete ->
                item {
                    WarningBanner(R.string.obsolete_extension_message)
                }
        }

        item {
            DetailsHeader(
                extension = extension,
                onClickUninstall = onClickUninstall,
                onClickAppInfo = onClickAppInfo,
                onClickAgeRating = {
                    showNsfwWarning = true
                },
            )
        }

        items(
            items = sources,
            key = { it.source.id },
        ) { source ->
            SourceSwitchPreference(
                modifier = Modifier.animateItemPlacement(),
                source = source,
                onClickSourcePreferences = onClickSourcePreferences,
                onClickSource = onClickSource,
            )
        }
    }
    if (showNsfwWarning) {
        NsfwWarningDialog(
            onClickConfirm = {
                showNsfwWarning = false
            },
        )
    }
}

@Composable
private fun WarningBanner(@StringRes textRes: Int) {
    Box(
        modifier = Modifier
            .fillMaxWidth()
            .background(MaterialTheme.colorScheme.error)
            .padding(16.dp),
        contentAlignment = Alignment.Center,
    ) {
        Text(
            text = stringResource(textRes),
            color = MaterialTheme.colorScheme.onError,
        )
    }
}

@Composable
private fun DetailsHeader(
    extension: Extension,
    onClickAgeRating: () -> Unit,
    onClickUninstall: () -> Unit,
    onClickAppInfo: () -> Unit,
) {
    val context = LocalContext.current

    Column {
        Column(
            modifier = Modifier
                .fillMaxWidth()
                .padding(
                    start = horizontalPadding,
                    end = horizontalPadding,
                    top = 16.dp,
                    bottom = 8.dp,
                ),
            horizontalAlignment = Alignment.CenterHorizontally,
        ) {
            ExtensionIcon(
                modifier = Modifier
                    .size(112.dp),
                extension = extension,
                density = DisplayMetrics.DENSITY_XXXHIGH,
            )

            Text(
                text = extension.name,
                style = MaterialTheme.typography.headlineSmall,
            )

            val strippedPkgName = extension.pkgName.substringAfter("eu.kanade.tachiyomi.extension.")

            Text(
                text = strippedPkgName,
                style = MaterialTheme.typography.bodySmall,
            )
        }

        Row(
            modifier = Modifier
                .fillMaxWidth()
                .padding(
                    horizontal = horizontalPadding * 2,
                    vertical = 8.dp,
                ),
            horizontalArrangement = Arrangement.SpaceEvenly,
            verticalAlignment = Alignment.CenterVertically,
        ) {
            InfoText(
                primaryText = extension.versionName,
                secondaryText = stringResource(R.string.ext_info_version),
            )

            InfoDivider()

            InfoText(
                primaryText = LocaleHelper.getSourceDisplayName(extension.lang, context),
                secondaryText = stringResource(R.string.ext_info_language),
            )

            if (extension.isNsfw) {
                InfoDivider()

                InfoText(
                    primaryText = stringResource(R.string.ext_nsfw_short),
                    primaryTextStyle = MaterialTheme.typography.bodyLarge.copy(
                        color = MaterialTheme.colorScheme.error,
                        fontWeight = FontWeight.Medium,
                    ),
                    secondaryText = stringResource(R.string.ext_info_age_rating),
                    onClick = onClickAgeRating,
                )
            }
        }

        Row(
            modifier = Modifier.padding(
                start = horizontalPadding,
                end = horizontalPadding,
                top = 8.dp,
                bottom = 16.dp,
            ),
        ) {
            OutlinedButton(
                modifier = Modifier.weight(1f),
                onClick = onClickUninstall,
            ) {
                Text(stringResource(R.string.ext_uninstall))
            }

            Spacer(Modifier.width(16.dp))

            Button(
                modifier = Modifier.weight(1f),
                onClick = onClickAppInfo,
            ) {
                Text(
                    text = stringResource(R.string.ext_app_info),
                    color = MaterialTheme.colorScheme.onPrimary,
                )
            }
        }

        Divider()
    }
}

@Composable
private fun InfoText(
    primaryText: String,
    primaryTextStyle: TextStyle = MaterialTheme.typography.bodyLarge,
    secondaryText: String,
    onClick: (() -> Unit)? = null,
) {
    val interactionSource = remember { MutableInteractionSource() }

    val modifier = if (onClick != null) {
        Modifier.clickable(interactionSource, indication = null) { onClick() }
    } else Modifier

    Column(
        modifier = modifier,
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.Center,
    ) {
        Text(
            text = primaryText,
            style = primaryTextStyle,
        )

        Text(
            text = secondaryText + if (onClick != null) " ⓘ" else "",
            style = MaterialTheme.typography.bodyMedium,
            color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.5f),
        )
    }
}

@Composable
private fun InfoDivider() {
    Divider(
        modifier = Modifier
            .height(20.dp)
            .width(1.dp),
        color = MaterialTheme.colorScheme.onSurface.copy(alpha = DIVIDER_ALPHA),
    )
}

@Composable
private fun SourceSwitchPreference(
    modifier: Modifier = Modifier,
    source: ExtensionSourceItem,
    onClickSourcePreferences: (sourceId: Long) -> Unit,
    onClickSource: (sourceId: Long) -> Unit,
) {
    val context = LocalContext.current

    PreferenceRow(
        modifier = modifier,
        title = if (source.labelAsName) {
            source.source.toString()
        } else {
            LocaleHelper.getSourceDisplayName(source.source.lang, context)
        },
        onClick = { onClickSource(source.source.id) },
        action = {
            Row(
                verticalAlignment = Alignment.CenterVertically,
            ) {
                if (source.source is ConfigurableSource) {
                    IconButton(onClick = { onClickSourcePreferences(source.source.id) }) {
                        Icon(
                            imageVector = Icons.Outlined.Settings,
                            contentDescription = stringResource(R.string.label_settings),
                            tint = MaterialTheme.colorScheme.onSurface,
                        )
                    }
                }

                Switch(checked = source.enabled, onCheckedChange = null)
            }
        },
    )
}

@Composable
fun NsfwWarningDialog(
    onClickConfirm: () -> Unit,
) {
    AlertDialog(
        text = {
            Text(text = stringResource(R.string.ext_nsfw_warning))
        },
        confirmButton = {
            TextButton(onClick = onClickConfirm) {
                Text(text = stringResource(android.R.string.ok))
            }
        },
        onDismissRequest = onClickConfirm,
    )
}