package helium314.keyboard.settings.dialogs

import android.content.Intent
import androidx.compose.foundation.layout.Column
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.res.stringResource
import helium314.keyboard.compat.locale
import helium314.keyboard.dictionarypack.DictionaryPackConstants
import helium314.keyboard.latin.Dictionary
import helium314.keyboard.latin.R
import helium314.keyboard.latin.ReadOnlyBinaryDictionary
import helium314.keyboard.latin.common.LocaleUtils
import helium314.keyboard.latin.common.LocaleUtils.constructLocale
import helium314.keyboard.latin.makedict.DictionaryHeader
import helium314.keyboard.latin.settings.USER_DICTIONARY_SUFFIX
import helium314.keyboard.latin.utils.DictionaryInfoUtils
import helium314.keyboard.latin.utils.ScriptUtils.script
import helium314.keyboard.latin.utils.SubtypeSettings
import java.io.File
import java.util.Locale

@Composable
fun NewDictionaryDialog(
    onDismissRequest: () -> Unit,
    cachedFile: File,
    mainLocale: Locale?
) {
    val (error, header) = checkDict(cachedFile)
    if (error != null) {
        InfoDialog(stringResource(error), onDismissRequest)
        cachedFile.delete()
    } else if (header != null) {
        val ctx = LocalContext.current
        val dictLocale = header.mLocaleString.constructLocale()
        var locale by remember { mutableStateOf(mainLocale ?: dictLocale) }
        val comparer = compareBy<Locale>({ it != mainLocale}, { it != dictLocale }, { it.script() != dictLocale.script() })
        val locales = SubtypeSettings.getAvailableSubtypeLocales().sortedWith(comparer)
        val cacheDir = DictionaryInfoUtils.getCacheDirectoryForLocale(locale, ctx)
        val dictFile = File(cacheDir, header.mIdString.substringBefore(":") + "_" + USER_DICTIONARY_SUFFIX)
        ThreeButtonAlertDialog(
            onDismissRequest = { onDismissRequest(); cachedFile.delete() },
            onConfirmed = {
                dictFile.parentFile?.mkdirs()
                dictFile.delete()
                cachedFile.renameTo(dictFile)
                if (header.mIdString.substringBefore(":") == Dictionary.TYPE_MAIN) {
                    // replaced main dict, remove the one created from internal data
                    val internalMainDictFile = File(cacheDir, DictionaryInfoUtils.getExtractedMainDictFilename())
                    internalMainDictFile.delete()
                }
                val newDictBroadcast = Intent(DictionaryPackConstants.NEW_DICTIONARY_INTENT_ACTION)
                ctx.sendBroadcast(newDictBroadcast)
            },
            text = {
                Column {
                    Text(header.info(LocalContext.current.resources.configuration.locale()))
                    // todo: dropdown takes very long to load, should be lazy!
                    //  but can't be lazy because of measurements (has width of widest element)
                    //  -> what do?
                    DropDownField(
                        selectedItem = locale,
                        onSelected = { locale = it },
                        items = locales
                    ) { Text(LocaleUtils.getLocaleDisplayNameInSystemLocale(it, ctx)) }
                    if (locale.script() != dictLocale.script())
                        Text("wrong script", color = MaterialTheme.colorScheme.error) // todo: string resource
                    if (dictFile.exists())
                        Text("will overwrite existing dictionary", color = MaterialTheme.colorScheme.error) // todo: string resource
                }
            }
        )
    }
}

private fun checkDict(file: File): Pair<Int?, DictionaryHeader?> {
    val newHeader = DictionaryInfoUtils.getDictionaryFileHeaderOrNull(file, 0, file.length())
        ?: return R.string.dictionary_file_error to null

    val locale = newHeader.mLocaleString.constructLocale()
    val dict = ReadOnlyBinaryDictionary(file.absolutePath, 0, file.length(), false, locale, "test")
    if (!dict.isValidDictionary) {
        dict.close()
        return R.string.dictionary_load_error to null
    }
    return null to newHeader
}