/*
 * Nextcloud - Android Client
 *
 * SPDX-FileCopyrightText: 2024 Alper Ozturk <alper.ozturk@nextcloud.com>
 * SPDX-License-Identifier: AGPL-3.0-or-later OR GPL-2.0-only
 */

package com.nextcloud.client.assistant.taskDetail

import androidx.compose.foundation.ExperimentalFoundationApi
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.Row
import androidx.compose.foundation.layout.Spacer
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.layout.width
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.filled.MoreVert
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.ModalBottomSheet
import androidx.compose.material3.Text
import androidx.compose.material3.rememberModalBottomSheetState
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.res.colorResource
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import com.nextcloud.utils.extensions.getRandomString
import com.owncloud.android.R
import com.owncloud.android.lib.resources.assistant.v2.model.Task
import com.owncloud.android.lib.resources.assistant.v2.model.TaskInput
import com.owncloud.android.lib.resources.assistant.v2.model.TaskOutput

@Suppress("LongMethod")
@OptIn(ExperimentalFoundationApi::class, ExperimentalMaterial3Api::class)
@Composable
fun TaskDetailBottomSheet(task: Task, showTaskActions: () -> Unit, dismiss: () -> Unit) {
    val sheetState = rememberModalBottomSheetState(skipPartiallyExpanded = true)

    ModalBottomSheet(
        modifier = Modifier.padding(top = 32.dp),
        containerColor = colorResource(R.color.bg_default),
        onDismissRequest = { dismiss() },
        sheetState = sheetState
    ) {
        Box {
            LazyColumn(
                modifier = Modifier
                    .fillMaxSize()
                    .padding(16.dp)
            ) {
                stickyHeader {
                    Row(
                        modifier = Modifier.fillMaxWidth()
                    ) {
                        Spacer(modifier = Modifier.weight(1f))

                        IconButton(onClick = showTaskActions) {
                            Icon(
                                imageVector = Icons.Filled.MoreVert,
                                contentDescription = "More button",
                                tint = colorResource(R.color.text_color)
                            )
                        }
                    }
                }

                item {
                    InputOutputCard(task)
                }
            }

            Row(
                modifier = Modifier
                    .align(Alignment.BottomCenter)
                    .fillMaxWidth()
                    .padding(bottom = 16.dp),
                horizontalArrangement = Arrangement.Center,
                verticalAlignment = Alignment.CenterVertically
            ) {
                Image(
                    painter = painterResource(R.drawable.ic_assistant),
                    contentDescription = "assistant icon",
                    modifier = Modifier.size(12.dp)
                )

                Spacer(modifier = Modifier.width(4.dp))

                Text(
                    text = stringResource(R.string.assistant_generation_warning),
                    color = colorResource(R.color.text_color),
                    fontSize = 12.sp
                )
            }
        }
    }
}

@Composable
fun InputOutputCard(task: Task) {
    Column(
        modifier = Modifier
            .fillMaxWidth()
            .background(Color.Transparent, shape = RoundedCornerShape(8.dp))
    ) {
        TitleDescriptionBox(
            title = stringResource(R.string.assistant_task_detail_screen_input_button_title),
            description = task.input?.input ?: ""
        )

        Spacer(modifier = Modifier.height(16.dp))

        TitleDescriptionBox(
            title = stringResource(R.string.assistant_task_detail_screen_output_button_title),
            description = task.output?.output ?: stringResource(R.string.assistant_screen_task_output_empty_text)
        )
    }
}

@Composable
private fun TitleDescriptionBox(title: String, description: String?) {
    Text(
        text = title,
        fontWeight = FontWeight.Bold,
        fontSize = 16.sp,
        color = colorResource(R.color.text_color)
    )

    Box(
        modifier = Modifier
            .fillMaxWidth()
            .padding(top = 8.dp)
            .background(color = colorResource(R.color.task_container), RoundedCornerShape(8.dp))
            .padding(12.dp)
    ) {
        Text(
            text = description ?: "",
            color = colorResource(R.color.text_color)
        )
    }
}

@Suppress("MagicNumber")
@Preview
@Composable
private fun TaskDetailScreenPreview() {
    TaskDetailBottomSheet(
        task = Task(
            1,
            "Free Prompt",
            null,
            "1",
            "1",
            TaskInput("Give me text".getRandomString(100)),
            TaskOutput("output".getRandomString(300)),
            1707692337,
            1707692337,
            1707692337,
            1707692337,
            1707692337
        ),
        showTaskActions = {
        }
    ) {
    }
}
