package ru.omni_devel.cards

import android.app.Activity
import android.content.Intent
import android.graphics.BitmapFactory
import android.os.Bundle
import android.widget.Toast
import androidx.activity.ComponentActivity
import androidx.activity.compose.LocalActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.activity.result.ActivityResult
import androidx.compose.foundation.Image
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.Row
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.size
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.outlined.QrCode
import androidx.compose.material3.CircularProgressIndicator
import androidx.compose.material3.Icon
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateMapOf
import androidx.compose.runtime.setValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.graphics.ImageBitmap
import androidx.compose.ui.graphics.asImageBitmap
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import io.ktor.client.HttpClient
import io.ktor.client.call.body
import io.ktor.client.engine.cio.CIO
import io.ktor.client.request.get
import io.ktor.client.statement.HttpResponse
import io.ktor.client.statement.bodyAsText
import kotlinx.coroutines.launch
import ru.omni_devel.cards.ui.theme.OmniCardsTheme

class SelectIconActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContent {
            OmniCardsTheme {
                Scaffold(modifier = Modifier.fillMaxSize()) { innerPadding ->
                    SelectIconPage(innerPadding)
                }
            }
        }
    }
}

@Composable
fun SelectIconPage(innerPadding: PaddingValues) {
    val context = LocalContext.current
    val activityContext = LocalActivity.current

    val language = getLanguage(context)

    var searchQuery by rememberSaveable { mutableStateOf("") }

    var iconsData by remember { mutableStateOf<List<CardIcon>?>(null) }
    val loadedIcons = remember { mutableStateMapOf<String, ImageBitmap?>() }
    var loadingError by remember { mutableStateOf<String?>(null) }

    LaunchedEffect(Unit) {
        try {
            val client = HttpClient(CIO)

            val response: HttpResponse = client.get("$REPO_BASE_URL/$ICONS_REPO_FILE")

            val loadedIconsData = CardIcon.parseIconsDataFromJson(response.bodyAsText())
            iconsData = loadedIconsData

            for (iconData in loadedIconsData) {
                if (iconData.iconId != null) {
                    launch {
                        val response = client.get("$REPO_BASE_URL/icons/${iconData.iconId}.png")
                        val bytes: ByteArray = response.body()

                        BitmapFactory.decodeByteArray(bytes, 0, bytes.size)?.let { bitmap ->
                            loadedIcons[iconData.iconId] = bitmap.asImageBitmap()
                        }
                    }
                }
            }
        } catch (e: Exception) {
            loadingError = e.toString()
        }
    }

    var queryCleaned = searchQuery.lowercase()

    for ((from, to) in SEARCH_REPLACE_SYMBOLS) {
        queryCleaned = queryCleaned.replace(from, to)
    }

    val searchResults = iconsData?.filter { iconData ->
        if (queryCleaned.isEmpty()) {
            return@filter true
        }

        for (name in iconData.names.values) {
            var nameCleaned = name.lowercase()

            for ((from, to) in SEARCH_REPLACE_SYMBOLS) {
                nameCleaned = nameCleaned.replace(from, to)
            }

            if (nameCleaned.contains(queryCleaned)) {
                return@filter true
            }
        }

        return@filter false
    } ?: emptyList()

    Page(context.getString(R.string.choosing_icon), innerPadding) {
        OutlinedTextField(
            value = searchQuery,
            onValueChange = { newValue ->
                searchQuery = newValue
            },
            modifier = Modifier.fillMaxWidth(),
            label = { Text(stringResource(R.string.search)) }
        )

        LazyColumn(
            verticalArrangement = Arrangement.spacedBy(8.dp),
            horizontalAlignment = Alignment.CenterHorizontally
        ) {
            if (loadingError != null) {
                item {
                    Text(loadingError!!)
                }
            } else if (iconsData == null) {
                item {
                    Column(
                        modifier = Modifier.fillMaxWidth(),
                        horizontalAlignment = Alignment.CenterHorizontally
                    ) {
                        CircularProgressIndicator(
                            modifier = Modifier.size(48.dp),
                            color = MaterialTheme.colorScheme.primary
                        )
                    }
                }
            } else {
                if (searchResults.isEmpty()) {
                    item {
                        Text(stringResource(R.string.icons_not_found))
                    }
                } else {
                    for (iconData in searchResults) {
                        val loadedIcon = loadedIcons[iconData.iconId]

                        item {
                            AdaptiveButton(
                                modifier = Modifier
                                    .fillMaxWidth()
                                    .height(64.dp),
                                contentPadding = PaddingValues(0.dp),
                                onClick = {
                                    if (loadedIcon == null && iconData.iconId != null) {
                                        Toast.makeText(
                                            context,
                                            context.getString(R.string.wait_for_icon_load),
                                            Toast.LENGTH_SHORT
                                        ).show()
                                    } else {
                                        val intent = Intent()

                                        if (loadedIcon != null) {
                                            intent.putExtra(
                                                "icon",
                                                imageBitmapToBase64(loadedIcon)
                                            )
                                        }

                                        activityContext!!.setResult(
                                            Activity.RESULT_OK,
                                            intent
                                        )
                                        activityContext.finish()
                                    }
                                }
                            ) {
                                Row(
                                    modifier = Modifier
                                        .fillMaxSize()
                                        .background(Color.Transparent)
                                        .padding(horizontal = 8.dp),
                                    verticalAlignment = Alignment.CenterVertically,
                                    horizontalArrangement = Arrangement.spacedBy(8.dp)
                                ) {
                                    CardIcon(
                                        loadedIcon,
                                        MaterialTheme.colorScheme.primary,
                                        loadedIcon == null && iconData.iconId != null
                                    )

                                    Text(
                                        selectItemNameViaLanguage(
                                            iconData.names,
                                            language
                                        )
                                    )
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}