/*
 * 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.
 */

package com.google.accompanist.sample.pager

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.PaddingValues
import androidx.compose.foundation.layout.fillMaxHeight
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Scaffold
import androidx.compose.material.Surface
import androidx.compose.material.Text
import androidx.compose.material.TopAppBar
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import com.google.accompanist.pager.ExperimentalPagerApi
import com.google.accompanist.pager.VerticalPager
import com.google.accompanist.pager.rememberPagerState
import com.google.accompanist.sample.AccompanistSampleTheme
import com.google.accompanist.sample.R

class VerticalPagerBasicSample : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        setContent {
            AccompanistSampleTheme {
                Surface {
                    Sample()
                }
            }
        }
    }
}

@OptIn(ExperimentalPagerApi::class)
@Composable
private fun Sample() {
    Scaffold(
        topBar = {
            TopAppBar(
                title = { Text(stringResource(R.string.vertical_pager_title_basics)) },
                backgroundColor = MaterialTheme.colors.surface,
            )
        },
        modifier = Modifier.fillMaxSize()
    ) { padding ->
        Column(Modifier.fillMaxSize().padding(padding)) {
            val pagerState = rememberPagerState()

            // Display 10 items
            VerticalPager(
                count = 10,
                state = pagerState,
                // Add 32.dp vertical padding to 'center' the pages
                contentPadding = PaddingValues(vertical = 32.dp),
                // Add some vertical spacing between items
                itemSpacing = 8.dp,
                modifier = Modifier
                    .weight(1f)
                    .fillMaxHeight(),
            ) { page ->
                PagerSampleItem(
                    page = page,
                    modifier = Modifier.fillMaxSize()
                )
            }

            ActionsRow(
                pagerState = pagerState,
                modifier = Modifier.align(Alignment.CenterHorizontally)
            )
        }
    }
}
