/*
 * Copyright 2021 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

@file:Suppress("UNUSED_ANONYMOUS_PARAMETER")

package com.google.accompanist.sample.swiperefresh

import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.runtime.Composable
import androidx.compose.runtime.collectAsState
import androidx.compose.runtime.getValue
import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import androidx.lifecycle.viewmodel.compose.viewModel
import com.google.accompanist.swiperefresh.SwipeRefresh
import com.google.accompanist.swiperefresh.rememberSwipeRefreshState
import kotlinx.coroutines.delay
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class MyViewModel : ViewModel() {
    private val _isRefreshing = MutableStateFlow(false)

    val isRefreshing: StateFlow<Boolean>
        get() = _isRefreshing.asStateFlow()

    fun refresh() {
        // This doesn't handle multiple 'refreshing' tasks, don't use this
        viewModelScope.launch {
            // A fake 2 second 'refresh'
            _isRefreshing.emit(true)
            delay(2000)
            _isRefreshing.emit(false)
        }
    }
}

@Composable
fun SwipeRefreshSample() {
    val viewModel: MyViewModel = viewModel()
    val isRefreshing by viewModel.isRefreshing.collectAsState()

    SwipeRefresh(
        state = rememberSwipeRefreshState(isRefreshing),
        onRefresh = { viewModel.refresh() },
    ) {
        LazyColumn {
            items(30) { index ->
                // TODO: list items
            }
        }
    }
}
