/*
 * Copyright (c) 2025 Element Creations Ltd.
 * Copyright 2023-2025 New Vector Ltd.
 *
 * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
 * Please see LICENSE files in the repository root for full details.
 */

package id.databisnis.android.bachot.features.home.impl.search

import androidx.activity.compose.BackHandler
import androidx.compose.animation.AnimatedVisibility
import androidx.compose.animation.fadeIn
import androidx.compose.animation.fadeOut
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.consumeWindowInsets
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.material3.ExperimentalMaterial3Api
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.TextFieldDefaults
import androidx.compose.runtime.Composable
import androidx.compose.runtime.LaunchedEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.drawBehind
import androidx.compose.ui.focus.FocusRequester
import androidx.compose.ui.focus.focusRequester
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.input.TextFieldValue
import androidx.compose.ui.tooling.preview.PreviewParameter
import androidx.compose.ui.unit.dp
import id.databisnis.android.bachot.compound.tokens.generated.CompoundIcons
import id.databisnis.android.bachot.features.home.impl.components.RoomSummaryRow
import id.databisnis.android.bachot.features.home.impl.contentType
import id.databisnis.android.bachot.features.home.impl.model.RoomListRoomSummary
import id.databisnis.android.bachot.features.home.impl.roomlist.RoomListEvents
import id.databisnis.android.bachot.libraries.designsystem.components.button.BackButton
import id.databisnis.android.bachot.libraries.designsystem.preview.ElementPreview
import id.databisnis.android.bachot.libraries.designsystem.preview.PreviewsDayNight
import id.databisnis.android.bachot.libraries.designsystem.theme.components.FilledTextField
import id.databisnis.android.bachot.libraries.designsystem.theme.components.Icon
import id.databisnis.android.bachot.libraries.designsystem.theme.components.IconButton
import id.databisnis.android.bachot.libraries.designsystem.theme.components.Scaffold
import id.databisnis.android.bachot.libraries.designsystem.theme.components.TopAppBar
import id.databisnis.android.bachot.libraries.matrix.api.core.RoomId
import id.databisnis.android.bachot.libraries.ui.strings.CommonStrings

@Composable
internal fun RoomListSearchView(
    state: RoomListSearchState,
    hideInvitesAvatars: Boolean,
    eventSink: (RoomListEvents) -> Unit,
    onRoomClick: (RoomId) -> Unit,
    modifier: Modifier = Modifier,
) {
    BackHandler(enabled = state.isSearchActive) {
        state.eventSink(RoomListSearchEvents.ToggleSearchVisibility)
    }

    AnimatedVisibility(
        visible = state.isSearchActive,
        enter = fadeIn(),
        exit = fadeOut(),
    ) {
        Column(modifier = modifier) {
            RoomListSearchContent(
                state = state,
                hideInvitesAvatars = hideInvitesAvatars,
                onRoomClick = onRoomClick,
                eventSink = eventSink,
            )
        }
    }
}

@OptIn(ExperimentalMaterial3Api::class)
@Composable
private fun RoomListSearchContent(
    state: RoomListSearchState,
    hideInvitesAvatars: Boolean,
    eventSink: (RoomListEvents) -> Unit,
    onRoomClick: (RoomId) -> Unit,
) {
    val borderColor = MaterialTheme.colorScheme.tertiary
    val strokeWidth = 1.dp
    fun onBackButtonClick() {
        state.eventSink(RoomListSearchEvents.ToggleSearchVisibility)
    }

    fun onRoomClick(room: RoomListRoomSummary) {
        onRoomClick(room.roomId)
    }
    Scaffold(
        topBar = {
            TopAppBar(
                modifier = Modifier.drawBehind {
                    drawLine(
                        color = borderColor,
                        start = Offset(0f, size.height),
                        end = Offset(size.width, size.height),
                        strokeWidth = strokeWidth.value
                    )
                },
                navigationIcon = { BackButton(onClick = ::onBackButtonClick) },
                title = {
                    // TODO replace `state.query` with TextFieldState when it's available for M3 TextField
                    // The stateSaver will keep the selection state when returning to this UI
                    var value by rememberSaveable(stateSaver = TextFieldValue.Saver) {
                        mutableStateOf(TextFieldValue(state.query))
                    }

                    val focusRequester = remember { FocusRequester() }
                    FilledTextField(
                        modifier = Modifier
                            .fillMaxWidth()
                            .focusRequester(focusRequester),
                        value = value,
                        singleLine = true,
                        onValueChange = {
                            value = it
                            state.eventSink(RoomListSearchEvents.QueryChanged(it.text))
                        },
                        colors = TextFieldDefaults.colors(
                            focusedContainerColor = Color.Transparent,
                            unfocusedContainerColor = Color.Transparent,
                            disabledContainerColor = Color.Transparent,
                            focusedIndicatorColor = Color.Transparent,
                            unfocusedIndicatorColor = Color.Transparent,
                            disabledIndicatorColor = Color.Transparent,
                            errorIndicatorColor = Color.Transparent,
                        ),
                        trailingIcon = {
                            if (value.text.isNotEmpty()) {
                                IconButton(onClick = {
                                    state.eventSink(RoomListSearchEvents.ClearQuery)
                                    // Clear local state too
                                    value = value.copy(text = "")
                                }) {
                                    Icon(
                                        imageVector = CompoundIcons.Close(),
                                        contentDescription = stringResource(CommonStrings.action_cancel)
                                    )
                                }
                            }
                        }
                    )

                    LaunchedEffect(Unit) {
                        if (!focusRequester.restoreFocusedChild()) {
                            focusRequester.requestFocus()
                        }
                        focusRequester.saveFocusedChild()
                    }
                },
            )
        }
    ) { padding ->
        Column(
            modifier = Modifier
                .padding(padding)
                .consumeWindowInsets(padding)
        ) {
            LazyColumn(
                modifier = Modifier.weight(1f),
            ) {
                items(
                    items = state.results,
                    contentType = { room -> room.contentType() },
                ) { room ->
                    RoomSummaryRow(
                        room = room,
                        hideInviteAvatars = hideInvitesAvatars,
                        // TODO
                        isInviteSeen = false,
                        onClick = ::onRoomClick,
                        eventSink = eventSink,
                    )
                }
            }
        }
    }
}

@PreviewsDayNight
@Composable
internal fun RoomListSearchContentPreview(@PreviewParameter(RoomListSearchStateProvider::class) state: RoomListSearchState) = ElementPreview {
    RoomListSearchContent(
        state = state,
        hideInvitesAvatars = false,
        onRoomClick = {},
        eventSink = {},
    )
}
