package com.hzliuzhi.applet.container.ui

import android.content.Intent
import android.provider.Settings
import android.util.Patterns
import android.widget.Toast
import androidx.compose.foundation.clickable
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.text.KeyboardActions
import androidx.compose.foundation.text.KeyboardOptions
import androidx.compose.material.icons.Icons
import androidx.compose.material.icons.automirrored.filled.Send
import androidx.compose.material.icons.filled.Info
import androidx.compose.material.icons.filled.QrCode
import androidx.compose.material3.Card
import androidx.compose.material3.Icon
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Surface
import androidx.compose.material3.Switch
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.DisposableEffect
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.platform.LocalSoftwareKeyboardController
import androidx.compose.ui.text.input.ImeAction
import androidx.compose.ui.text.input.KeyboardType
import androidx.compose.ui.text.style.TextDecoration
import androidx.compose.ui.unit.dp
import androidx.core.net.toUri
import androidx.lifecycle.compose.LocalLifecycleOwner
import com.hzliuzhi.applet.core.store.SettingStore
import com.hzliuzhi.applet.scanner.ScanResult
import com.hzliuzhi.applet.scanner.Scanner


@Composable
fun LauncherScreen(
  modifier: Modifier = Modifier,
  start: (String) -> String?,
) {
  val context = LocalContext.current
  var text by remember { mutableStateOf("") }
  var storeEnabled by remember { mutableStateOf(true) }

  Column(
    modifier = modifier
      .fillMaxSize()
      .padding(24.dp),
    verticalArrangement = Arrangement.Center
  ) {
    LauncherInputField(
      value = text,
      onValueChange = { text = it },
      onDone = {
        start(text)?.also {
          SettingStore.getInstance(context).screen = if (storeEnabled) it else null
        }
      },
    )
    Spacer(modifier = Modifier.height(24.dp))
    StorageCard(
      enabled = storeEnabled,
      enabledChange = { storeEnabled = it }
    )
  }
}

@Composable
fun LauncherInputField(
  value: String,
  onValueChange: (String) -> Unit,
  onDone: () -> Unit,
  modifier: Modifier = Modifier,
) {
  val context = LocalContext.current

  val scanner = Scanner.getInstance(context)
  val owner = LocalLifecycleOwner.current

  DisposableEffect(owner, scanner) {
    val observer: (ScanResult?) -> Unit = { result -> result?.code?.also { onValueChange(it) } }
    scanner.observe(owner, observer)
    onDispose { scanner.removeObserver(observer) }
  }

  val isUrl = remember(value) { Patterns.WEB_URL.matcher(value).matches() }

  val keyboardController = LocalSoftwareKeyboardController.current

  fun done() {
    if (isUrl) {
      keyboardController?.hide()
      onDone()
    } else Toast.makeText(context, "请输入合法的网址", Toast.LENGTH_SHORT).show()
  }


  OutlinedTextField(
    value = value,
    onValueChange = onValueChange,
    label = { Text("请输入URL") },
    singleLine = true,
    isError = value.isNotBlank() && !isUrl,
    modifier = modifier.fillMaxWidth(),
    keyboardOptions = KeyboardOptions(
      keyboardType = KeyboardType.Uri,
      imeAction = ImeAction.Done
    ),
    keyboardActions = KeyboardActions(onDone = { done() }),
    trailingIcon = {
      if (value.isBlank()) {
        Icon(
          imageVector = Icons.Filled.QrCode,
          contentDescription = "扫码",
          modifier = Modifier.clickable {
            scanner.start()
            keyboardController?.hide()
          }
        )
      } else {
        Icon(
          imageVector = Icons.AutoMirrored.Filled.Send,
          contentDescription = "完成",
          modifier = Modifier.clickable { done() }
        )
      }
    }
  )
}

@Composable
fun StorageCard(
  enabled: Boolean,
  enabledChange: (Boolean) -> Unit,
) {
  val context = LocalContext.current

  val appName = runCatching {
    val info = context.applicationInfo
    info.labelRes.takeIf { it != 0 }?.let { context.getString(it) } ?: info.nonLocalizedLabel?.toString()
  }.getOrNull() ?: "本App"

  Card(
    modifier = Modifier.fillMaxWidth(),
    shape = MaterialTheme.shapes.medium,
  ) {
    Column(
      modifier = Modifier.padding(start = 12.dp, end = 12.dp)
    ) {
      // 头部：标题+开关
      Row(
        modifier = Modifier.fillMaxWidth(),
        verticalAlignment = Alignment.CenterVertically
      ) {
        Text(
          text = "存储数据",
          style = MaterialTheme.typography.titleMedium,
          modifier = Modifier.weight(1f)
        )
        Switch(
          checked = enabled,
          onCheckedChange = enabledChange
        )
      }
      if (enabled) {
        Spacer(modifier = Modifier.height(8.dp))
        Row(verticalAlignment = Alignment.CenterVertically) {
          Icon(
            imageVector = Icons.Default.Info,
            contentDescription = null,
            tint = MaterialTheme.colorScheme.secondary
          )
          Spacer(modifier = Modifier.width(8.dp))
          Text(
            text = "如需清除缓存，请在",
            style = MaterialTheme.typography.bodyMedium,
            color = MaterialTheme.colorScheme.secondary
          )
          Text(
            text = "设置中操作",
            style = MaterialTheme.typography.bodyMedium.copy(color = Color(0xFF1976D2), textDecoration = TextDecoration.Underline),
            modifier = Modifier
              .clickable {
                val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS).apply {
                  data = ("package:" + context.packageName).toUri()
                }
                context.startActivity(intent)
              }
          )
        }
        Spacer(modifier = Modifier.height(12.dp))
        Text(
          text = "清除数据：",
          style = MaterialTheme.typography.bodyMedium,
          color = MaterialTheme.colorScheme.primary
        )
        Spacer(modifier = Modifier.height(8.dp))
        Column {
          val steps = listOf(
            "打开系统设置",
            "找到应用管理",
            "选择$appName",
            "进入存储与缓存",
            "点击清除全部数据(存储空间)"
          )
          steps.forEachIndexed { idx, step ->
            Row(verticalAlignment = Alignment.CenterVertically) {
              Surface(
                shape = MaterialTheme.shapes.small,
                color = MaterialTheme.colorScheme.primary.copy(alpha = 0.1f),
                modifier = Modifier.size(24.dp)
              ) {
                Box(contentAlignment = Alignment.Center) {
                  Text("${idx + 1}", style = MaterialTheme.typography.labelMedium)
                }
              }
              Spacer(modifier = Modifier.width(8.dp))
              Text(step, style = MaterialTheme.typography.bodySmall)
            }
            if (idx < steps.lastIndex) Spacer(modifier = Modifier.height(6.dp))
          }
        }
        Spacer(modifier = Modifier.height(8.dp))
      }
    }
  }
}