/*
 * Copyright 2024 Signal Messenger, LLC
 * SPDX-License-Identifier: AGPL-3.0-only
 */

package org.thoughtcrime.securesms.conversation.v2

import android.content.res.Configuration
import androidx.annotation.DrawableRes
import androidx.annotation.StringRes
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.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.pager.HorizontalPager
import androidx.compose.foundation.pager.rememberPagerState
import androidx.compose.foundation.rememberScrollState
import androidx.compose.foundation.shape.CircleShape
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.foundation.verticalScroll
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.material3.TextButton
import androidx.compose.runtime.Composable
import androidx.compose.runtime.remember
import androidx.compose.runtime.rememberCoroutineScope
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.input.nestedscroll.nestedScroll
import androidx.compose.ui.platform.rememberNestedScrollInteropConnection
import androidx.compose.ui.res.colorResource
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.core.os.bundleOf
import androidx.fragment.app.FragmentManager
import kotlinx.coroutines.launch
import org.signal.core.ui.compose.BottomSheets
import org.signal.core.ui.compose.Buttons
import org.signal.core.ui.compose.DayNightPreviews
import org.signal.core.ui.compose.theme.SignalTheme
import org.thoughtcrime.securesms.R
import org.thoughtcrime.securesms.compose.ComposeBottomSheetDialogFragment

/**
 * Shows tips about typical spam and fraud messages.
 */
class SafetyTipsBottomSheetDialog : ComposeBottomSheetDialogFragment() {
  companion object {
    private const val FOR_GROUP_ARG = "for_group"

    fun show(fragmentManager: FragmentManager, forGroup: Boolean) {
      SafetyTipsBottomSheetDialog()
        .apply {
          arguments = bundleOf(
            FOR_GROUP_ARG to forGroup
          )
        }
        .show(fragmentManager, "SAFETY_TIPS")
    }
  }

  override val peekHeightPercentage: Float = 1f

  @Composable
  override fun SheetContent() {
    val nestedScrollInterop = rememberNestedScrollInteropConnection()
    SafetyTipsContent(
      forGroup = requireArguments().getBoolean(FOR_GROUP_ARG, false),
      modifier = Modifier.nestedScroll(nestedScrollInterop)
    )
  }
}

data class SafetyTipData(
  @DrawableRes val heroImage: Int,
  @StringRes val titleText: Int,
  @StringRes val messageText: Int
)

private val tips = listOf(
  SafetyTipData(heroImage = R.drawable.safety_tip0, titleText = R.string.SafetyTips_tip0_title, messageText = R.string.SafetyTips_tip0_message),
  SafetyTipData(heroImage = R.drawable.safety_tip1, titleText = R.string.SafetyTips_tip1_title, messageText = R.string.SafetyTips_tip1_message),
  SafetyTipData(heroImage = R.drawable.safety_tip2, titleText = R.string.SafetyTips_tip2_title, messageText = R.string.SafetyTips_tip2_message),
  SafetyTipData(heroImage = R.drawable.safety_tip3, titleText = R.string.SafetyTips_tip3_title, messageText = R.string.SafetyTips_tip3_message),
  SafetyTipData(heroImage = R.drawable.safety_tip4, titleText = R.string.SafetyTips_tip4_title, messageText = R.string.SafetyTips_tip4_message)
)

@DayNightPreviews
@Composable
private fun SafetyTipsContentPreview() {
  SignalTheme {
    Surface {
      SafetyTipsContent()
    }
  }
}

@OptIn(ExperimentalFoundationApi::class)
@Composable
private fun SafetyTipsContent(forGroup: Boolean = false, modifier: Modifier = Modifier) {
  Box(
    contentAlignment = Alignment.Center,
    modifier = Modifier.fillMaxWidth()
  ) {
    BottomSheets.Handle()
  }

  val size = remember { tips.size }
  val pagerState = rememberPagerState(
    pageCount = { size }
  )
  val scrollState = rememberScrollState()

  Column(
    modifier = Modifier.fillMaxWidth()
  ) {
    Column(
      modifier = modifier
        .fillMaxWidth()
        .weight(weight = 1f, fill = false)
        .padding(top = 22.dp)
        .verticalScroll(state = scrollState)
    ) {
      Text(
        text = stringResource(id = R.string.SafetyTips_title),
        style = MaterialTheme.typography.headlineMedium.copy(textAlign = TextAlign.Center),
        modifier = Modifier
          .padding(start = 24.dp, end = 24.dp, bottom = 4.dp, top = 26.dp)
          .fillMaxWidth()
      )

      Text(
        text = if (forGroup) stringResource(id = R.string.SafetyTips_subtitle_group) else stringResource(id = R.string.SafetyTips_subtitle_individual),
        style = MaterialTheme.typography.bodyMedium.copy(color = MaterialTheme.colorScheme.onSurfaceVariant),
        modifier = Modifier
          .padding(start = 36.dp, end = 36.dp)
          .fillMaxWidth()
      )

      HorizontalPager(
        state = pagerState,
        beyondViewportPageCount = size,
        modifier = Modifier.padding(top = 24.dp)
      ) {
        SafetyTip(tips[it])
      }

      Row(
        Modifier
          .fillMaxWidth()
          .padding(top = 20.dp),
        horizontalArrangement = Arrangement.Center
      ) {
        repeat(pagerState.pageCount) { iteration ->
          val color = if (pagerState.currentPage == iteration) {
            MaterialTheme.colorScheme.onSecondaryContainer.copy(alpha = 0.8f)
          } else {
            MaterialTheme.colorScheme.onSecondaryContainer.copy(alpha = 0.3f)
          }
          Box(
            modifier = Modifier
              .padding(3.dp)
              .clip(CircleShape)
              .background(color)
              .size(8.dp)
          )
        }
      }
    }

    Surface(
      shadowElevation = if (scrollState.canScrollForward) 8.dp else 0.dp,
      modifier = Modifier.fillMaxWidth(),
      color = SignalTheme.colors.colorSurface1,
      contentColor = MaterialTheme.colorScheme.onSurface
    ) {
      Row(
        horizontalArrangement = Arrangement.SpaceBetween,
        modifier = Modifier
          .padding(start = 24.dp, end = 24.dp, bottom = 36.dp, top = 24.dp)
          .fillMaxWidth()
      ) {
        val coroutineScope = rememberCoroutineScope()

        TextButton(
          onClick = {
            coroutineScope.launch {
              pagerState.animateScrollToPage(pagerState.currentPage - 1)
            }
          },
          enabled = pagerState.currentPage > 0,
          modifier = Modifier
        ) {
          Text(text = stringResource(id = R.string.SafetyTips_previous_tip))
        }

        Buttons.LargeTonal(
          onClick = {
            coroutineScope.launch {
              pagerState.animateScrollToPage(pagerState.currentPage + 1)
            }
          },
          enabled = pagerState.currentPage + 1 < pagerState.pageCount
        ) {
          Text(text = stringResource(id = R.string.SafetyTips_next_tip))
        }
      }
    }
  }
}

@Preview(name = "Light Theme", group = "screen", uiMode = Configuration.UI_MODE_NIGHT_NO)
@Preview(name = "Dark Theme", group = "screen", uiMode = Configuration.UI_MODE_NIGHT_YES)
@Composable
private fun SafetyTipPreview() {
  SignalTheme {
    Surface {
      SafetyTip(tips[0])
    }
  }
}

@Composable
private fun SafetyTip(safetyTip: SafetyTipData) {
  Surface(
    shape = RoundedCornerShape(18.dp),
    color = colorResource(id = R.color.safety_tip_background),
    contentColor = MaterialTheme.colorScheme.onSurface,
    modifier = Modifier
      .fillMaxWidth()
      .padding(start = 24.dp, end = 24.dp)
  ) {
    Column(
      horizontalAlignment = Alignment.CenterHorizontally,
      modifier = Modifier
        .fillMaxWidth()
    ) {
      Surface(
        shape = RoundedCornerShape(12.dp),
        color = colorResource(id = R.color.safety_tip_image_background),
        modifier = Modifier
          .padding(12.dp)
          .fillMaxWidth()
      ) {
        Image(
          painter = painterResource(id = safetyTip.heroImage),
          contentDescription = null,
          modifier = Modifier
            .padding(16.dp)
        )
      }

      Text(
        text = stringResource(id = safetyTip.titleText),
        style = MaterialTheme.typography.titleMedium,
        modifier = Modifier
          .padding(start = 24.dp, end = 24.dp, top = 8.dp, bottom = 4.dp)
      )

      Text(
        text = stringResource(id = safetyTip.messageText),
        style = MaterialTheme.typography.bodyLarge.copy(color = MaterialTheme.colorScheme.onSurfaceVariant, textAlign = TextAlign.Center),
        modifier = Modifier
          .padding(start = 24.dp, end = 24.dp, bottom = 24.dp)
      )
    }
  }
}
