package com.vgmlr.shim

import androidx.compose.foundation.ExperimentalFoundationApi
import androidx.compose.foundation.background
import androidx.compose.foundation.clickable
import androidx.compose.foundation.combinedClickable
import androidx.compose.foundation.interaction.MutableInteractionSource
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.text.KeyboardActions
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.automirrored.filled.KeyboardReturn
import androidx.compose.material.icons.filled.Clear
import androidx.compose.material.icons.outlined.FileDownload
import androidx.compose.material3.*
import androidx.compose.runtime.Composable
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.LaunchedEffect
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.draw.clip
import androidx.compose.ui.focus.FocusDirection
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalFocusManager
import androidx.compose.ui.res.colorResource
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.FontFamily
import androidx.compose.ui.text.input.ImeAction
import androidx.compose.ui.text.input.TextFieldValue
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.compose.ui.window.Popup
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleEventObserver
import androidx.lifecycle.compose.LocalLifecycleOwner
import kotlinx.coroutines.delay
import androidx.compose.ui.focus.onFocusChanged
import androidx.compose.ui.text.TextRange
import androidx.compose.ui.unit.IntOffset

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun InputBar(
    shimText: String,
    themeManager: ShimThemeManager,
    onShimTextChange: (String) -> Unit,
    hashtagText: TextFieldValue,
    allTags: List<String>,
    topTags: List<String>,
    tagAssociations: Map<String, List<String>>,
    onHashtagTextChange: (TextFieldValue) -> Unit,
    onAdd: (String, TextFieldValue) -> Unit
) {
    val focusRequester = remember { FocusRequester() }
    val focusManager = LocalFocusManager.current
    val lifecycleOwner = LocalLifecycleOwner.current
    var showSuggestions by remember { mutableStateOf(false) }
    var lastSubmittedText by remember { mutableStateOf("") }
    val words = hashtagText.text.split(" ")
    val currentWord = words.lastOrNull() ?: ""
    val previousWord = if (words.size >= 2) words[words.size - 2] else ""
    val canAdd = shimText.isNotBlank() && hashtagText.text.isNotBlank()

    DisposableEffect(lifecycleOwner) {
        val observer = LifecycleEventObserver { _, event ->
            if (event == Lifecycle.Event.ON_RESUME) {
                focusRequester.requestFocus()
            }
        }
        lifecycleOwner.lifecycle.addObserver(observer)
        onDispose { lifecycleOwner.lifecycle.removeObserver(observer) }
    }

    LaunchedEffect(Unit) {
        delay(100)
        focusRequester.requestFocus()
    }

    Column(
        modifier = Modifier
            .fillMaxWidth()
            .clip(RoundedCornerShape(topStart = 14.dp, topEnd = 14.dp))
            .background(colorResource(id = R.color.input_bg_color))
    ) {
        Row(verticalAlignment = Alignment.CenterVertically) {
            TextField(
                value = shimText,
                onValueChange = onShimTextChange,
                placeholder = { Text("Logic", color = colorResource(id = R.color.input_color).copy(alpha = 0.5f)) },
                textStyle = TextStyle(
                    fontSize = 17.sp,
                    lineHeight = (themeManager.fontSize.floatValue * (themeManager.lineHeight.floatValue + themeManager.lineSpacing.floatValue)).sp,
                    color = colorResource(id = R.color.input_color)),
                modifier = Modifier
                    .weight(1f)
                    .focusRequester(focusRequester)
                    .padding(horizontal = 8.dp, vertical = 6.dp),
                keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next),
                keyboardActions = KeyboardActions(onNext = { focusManager.moveFocus(FocusDirection.Down) }),
                colors = TextFieldDefaults.colors(
                    focusedContainerColor = Color.Transparent,
                    unfocusedContainerColor = Color.Transparent,
                    focusedTextColor = colorResource(id = R.color.input_color),
                    unfocusedTextColor = colorResource(id = R.color.input_color),
                    cursorColor = colorResource(id = R.color.input_color),
                    focusedIndicatorColor = Color.Transparent,
                    unfocusedIndicatorColor = Color.Transparent
                )
            )
        }
        HorizontalDivider(modifier = Modifier.fillMaxWidth(), thickness = 2.dp, color = colorResource(id = R.color.background_color))
        Row(verticalAlignment = Alignment.CenterVertically) {
            Box(modifier = Modifier.weight(1f)) {
                TextField(
                    value = hashtagText,
                    onValueChange = {
                        if (lastSubmittedText.isNotEmpty() && it.text == lastSubmittedText) {
                            return@TextField
                        }
                        if (it.text != lastSubmittedText && it.text.isNotEmpty()) {
                            lastSubmittedText = ""
                        }
                        if (it.text.length <= 70) {
                            val sanitized = it.copy(text = it.text.replace("#", ""))
                            onHashtagTextChange(sanitized)
                            val newWords = sanitized.text.split(" ")
                            val ongoingWord = newWords.lastOrNull() ?: ""
                            val prevWord = if (newWords.size >= 2) newWords[newWords.size - 2] else ""

                            val isTyping = ongoingWord.isNotBlank()
                            val hasAssociations = ongoingWord.isEmpty() && prevWord.isNotBlank() && !tagAssociations[prevWord].isNullOrEmpty()

                            showSuggestions = isTyping || hasAssociations || sanitized.text.isBlank()
                        }
                    },
                    placeholder = { Text("Tags", color = colorResource(id = R.color.input_color).copy(alpha = 0.5f)) },
                    modifier = Modifier
                        .fillMaxWidth()
                        .onFocusChanged { state ->
                            showSuggestions = state.isFocused && hashtagText.text.isBlank()
                        }
                        .padding(horizontal = 8.dp, vertical = 4.dp),
                    textStyle = TextStyle(
                        color = colorResource(id = R.color.input_color),
                        lineHeight = (themeManager.fontSize.floatValue * (themeManager.lineHeight.floatValue + themeManager.lineSpacing.floatValue)).sp,
                        fontSize = 17.sp),
                    keyboardOptions = KeyboardOptions(imeAction = ImeAction.Done),
                    keyboardActions = KeyboardActions(onDone = {
                        if (canAdd) {
                            lastSubmittedText = hashtagText.text
                            onAdd(shimText, hashtagText)
                            focusRequester.requestFocus()
                        }
                    }),
                    colors = TextFieldDefaults.colors(
                        focusedContainerColor = Color.Transparent,
                        unfocusedContainerColor = Color.Transparent,
                        focusedTextColor = colorResource(id = R.color.input_color),
                        unfocusedTextColor = colorResource(id = R.color.input_color),
                        cursorColor = colorResource(id = R.color.input_color),
                        focusedIndicatorColor = Color.Transparent,
                        unfocusedIndicatorColor = Color.Transparent
                    ),
                    singleLine = true
                )

                if (showSuggestions) {
                    val suggestions = if (currentWord.isNotBlank()) {
                        allTags.filter { it.startsWith(currentWord, ignoreCase = true) && it != currentWord }
                    } else if (previousWord.isNotBlank()) {
                        val alreadyTypedTags = words.filter { it.isNotBlank() }.toSet()
                        tagAssociations[previousWord]?.filter { it !in alreadyTypedTags } ?: emptyList()
                    } else {
                        topTags
                    }
                    if (suggestions.isNotEmpty()) {
                        Popup(alignment = Alignment.TopStart, offset = IntOffset(120, -70)) {
                            Row(horizontalArrangement = Arrangement.spacedBy(6.dp)) {
                                suggestions.take(if (hashtagText.text.isBlank()) 5 else 3).forEach { tag ->
                                    Surface(
                                        color = colorResource(id = R.color.suggestion_bg_color),
                                        shape = RoundedCornerShape(8.dp),
                                        shadowElevation = 6.dp
                                    ) {
                                        val interactionSource = remember { MutableInteractionSource() }
                                        Text(
                                            text = tag,
                                            color = colorResource(id = R.color.input_color),
                                            modifier = Modifier
                                                .clickable(interactionSource = interactionSource, indication = null) {
                                                    val textWithoutLastWord = hashtagText.text.substringBeforeLast(" ", missingDelimiterValue = "")
                                                    val newText = if (textWithoutLastWord.isEmpty()) "$tag " else "$textWithoutLastWord $tag "

                                                    onHashtagTextChange(
                                                        TextFieldValue(
                                                            text = newText,
                                                            selection = TextRange(newText.length)
                                                        )
                                                    )
                                                    val currentTags = newText.split(" ").filter { it.isNotBlank() }.toSet()
                                                    val availableAssoc = tagAssociations[tag]?.filter { it !in currentTags }
                                                    showSuggestions = !availableAssoc.isNullOrEmpty()
                                                }
                                                .padding(horizontal = 16.dp, vertical = 6.dp)
                                        )
                                    }
                                }
                            }
                        }
                    }
                }
            }
            IconButton(
                onClick = {
                    if (canAdd) {
                        lastSubmittedText = hashtagText.text
                        onAdd(shimText, hashtagText)
                        focusRequester.requestFocus()
                    }
                },
                enabled = canAdd,
                modifier = Modifier
                    .padding(end = 20.dp)
                    .background(Color.White.copy(alpha = if (canAdd) 0.05f else 0.0f), shape = RoundedCornerShape(15.dp))
            ) {
                Icon(
                    Icons.AutoMirrored.Filled.KeyboardReturn,
                    contentDescription = "Add",
                    tint = colorResource(id = R.color.input_icon_color).copy(alpha = if (canAdd) 0.5f else 0.0f),
                    modifier = Modifier.size(26.dp)
                )
            }
        }
        HorizontalDivider(modifier = Modifier.fillMaxWidth(), thickness = 2.dp, color = colorResource(id = R.color.background_color))
    }
}

@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun SearchField(
    query: String,
    onQueryChange: (String) -> Unit,
    onClose: () -> Unit,
    onDownload: () -> Unit
) {
    Row(
        modifier = Modifier
            .fillMaxWidth()
            .height(54.dp)
            .background(colorResource(id = R.color.search_bg_color)),
        verticalAlignment = Alignment.CenterVertically
    ) {
        IconButton(onClick = { if (query.isEmpty()) onClose() else onQueryChange("") }) {
            Icon(Icons.Default.Clear, contentDescription = "Clear", tint = Color.White.copy(alpha = 0.6f))
        }
        TextField(
            value = query,
            onValueChange = onQueryChange,
            placeholder = { Text("Search", color = Color.White.copy(alpha = 0.5f), fontSize = 18.sp) },
            textStyle = TextStyle(fontSize = 18.sp),
            modifier = Modifier.weight(1f).offset(x = (-9).dp),
            colors = TextFieldDefaults.colors(
                focusedContainerColor = Color.Transparent,
                unfocusedContainerColor = Color.Transparent,
                focusedIndicatorColor = Color.Transparent,
                unfocusedIndicatorColor = Color.Transparent,
                cursorColor = Color.White,
                focusedTextColor = Color.White,
                unfocusedTextColor = Color.White
            ),
            singleLine = true
        )
        if (query.isNotEmpty()) {
            IconButton(
                onClick = onDownload,
                modifier = Modifier.padding(end = 6.dp)
            ) {
                Icon(
                    Icons.Outlined.FileDownload,
                    contentDescription = "Download",
                    tint = Color.White.copy(alpha = 0.6f)
                )
            }
        }
    }
}

@OptIn(ExperimentalFoundationApi::class)
@Composable
fun ShimItem(
    shim: ShimClass,
    themeManager: ShimThemeManager,
    isSelected: Boolean = false,
    isSelectionMode: Boolean = false,
    onHashtagClick: (String) -> Unit,
    onLongClick: () -> Unit = {},
    onClick: () -> Unit = {}
) {
    var isTimeVisible by remember { mutableStateOf(false) }

    Column(
        modifier = Modifier
            .fillMaxWidth()
            .background(if (isSelected) colorResource(id = R.color.select_bg_color).copy(alpha = 0.4f) else Color.Transparent)
            .combinedClickable(
                onClick = {
                    isTimeVisible = false
                    onClick()
                },
                onLongClick = {
                    if (!isSelectionMode) isTimeVisible = !isTimeVisible
                    onLongClick()
                }
            )
            .padding(horizontal = 18.dp, vertical = 18.dp)
    ) {
        Row(modifier = Modifier.padding(vertical = 0.dp)) {
            shim.shimhash.split(" ").filter { it.isNotBlank() }.forEach { tag ->
                Text(
                    text = tag,
                    style = TextStyle(
                        fontSize = themeManager.fontSize.floatValue.sp,
                        lineHeight = (themeManager.fontSize.floatValue * (themeManager.lineHeight.floatValue + themeManager.lineSpacing.floatValue)).sp,
                        color = themeManager.hashtagColor.value,
                        fontFamily = if (themeManager.isMonospace.value) FontFamily.Monospace else FontFamily.Default
                    ),
                    modifier = Modifier
                        .clickable { onHashtagClick(tag) }
                        .padding(end = 8.dp)
                )
            }
        }

        Spacer(modifier = Modifier.height(6.dp))

        Text(
            text = shim.shimtext,
            style = TextStyle(
                fontSize = themeManager.fontSize.floatValue.sp,
                lineHeight = (themeManager.fontSize.floatValue * (themeManager.lineHeight.floatValue + themeManager.lineSpacing.floatValue)).sp,
                color = themeManager.textColor.value,
                fontFamily = if (themeManager.isMonospace.value) FontFamily.Monospace else FontFamily.Default,
                letterSpacing = 0.6.sp
            )
        )

        if (isTimeVisible) {
            Spacer(modifier = Modifier.height(8.dp))
            Text(
                text = shim.shimtime,
                style = TextStyle(
                    fontSize = (themeManager.fontSize.floatValue * 0.85).sp,
                    lineHeight = (themeManager.fontSize.floatValue * (themeManager.lineHeight.floatValue + themeManager.lineSpacing.floatValue)).sp,
                    color = themeManager.hashtagColor.value,
                    fontFamily = if (themeManager.isMonospace.value) FontFamily.Monospace else FontFamily.Default
                )
            )
        }

        Spacer(modifier = Modifier.height(3.dp))
    }

    HorizontalDivider(
        modifier = Modifier
            .fillMaxWidth()
            .padding(top = 0.dp),
        thickness = 1.dp,
        color = colorResource(id = R.color.text_color).copy(alpha = 0.1f)
    )
}