268 lines
9.4 KiB
Kotlin
268 lines
9.4 KiB
Kotlin
package tw.local.botrates
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import android.content.ClipData
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import android.content.ClipboardManager
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import android.content.Context
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import android.os.Bundle
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import android.widget.Toast
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import androidx.activity.ComponentActivity
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import androidx.activity.compose.setContent
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import androidx.compose.foundation.layout.Arrangement
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import androidx.compose.foundation.layout.Column
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import androidx.compose.foundation.layout.PaddingValues
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import androidx.compose.foundation.layout.Row
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import androidx.compose.foundation.layout.Spacer
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import androidx.compose.foundation.layout.fillMaxSize
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import androidx.compose.foundation.layout.fillMaxWidth
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import androidx.compose.foundation.layout.height
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import androidx.compose.foundation.layout.padding
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import androidx.compose.foundation.layout.width
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import androidx.compose.foundation.text.KeyboardOptions
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import androidx.compose.material3.Button
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import androidx.compose.material3.ExperimentalMaterial3Api
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import androidx.compose.material3.HorizontalDivider
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import androidx.compose.material3.MaterialTheme
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import androidx.compose.material3.OutlinedTextField
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import androidx.compose.material3.Scaffold
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import androidx.compose.material3.Text
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import androidx.compose.material3.TopAppBar
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.LaunchedEffect
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import androidx.compose.runtime.getValue
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import androidx.compose.runtime.mutableStateMapOf
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import androidx.compose.runtime.mutableStateOf
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import androidx.compose.runtime.remember
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import androidx.compose.runtime.rememberCoroutineScope
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import androidx.compose.runtime.setValue
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import androidx.compose.ui.Alignment
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.graphics.Color
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import androidx.compose.ui.platform.LocalContext
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import androidx.compose.ui.text.TextStyle
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import androidx.compose.ui.text.font.FontFamily
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import androidx.compose.ui.text.font.FontWeight
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import androidx.compose.ui.text.input.KeyboardType
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import androidx.compose.ui.unit.dp
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import androidx.compose.ui.unit.sp
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.launch
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import kotlinx.coroutines.withContext
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import java.math.BigDecimal
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import java.math.RoundingMode
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import java.net.HttpURLConnection
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import java.net.URL
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import java.text.DecimalFormat
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import java.text.SimpleDateFormat
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import java.util.Date
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import java.util.Locale
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private const val URL_CSV = "https://rate.bot.com.tw/xrt/flcsv/0/day"
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private val TARGETS = listOf("USD" to "美元", "JPY" to "日幣", "EUR" to "歐元")
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data class Rate(val code: String, val name: String, val rate: Double)
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private fun fetchRates(): List<Rate> {
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val conn = (URL(URL_CSV).openConnection() as HttpURLConnection).apply {
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connectTimeout = 10_000
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readTimeout = 10_000
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setRequestProperty("User-Agent", "Mozilla/5.0 bot_rates")
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}
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val body = conn.inputStream.bufferedReader().use { it.readText() }
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.trimStart('\uFEFF')
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val out = mutableListOf<Rate>()
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body.lines().drop(1).forEach { line ->
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val cols = line.split(",")
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if (cols.size < 14) return@forEach
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val code = cols[0].trim()
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val pair = TARGETS.firstOrNull { it.first == code } ?: return@forEach
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val v = cols[13].trim().toDoubleOrNull() ?: return@forEach
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out.add(Rate(code, pair.second, v))
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}
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return out.sortedBy { r -> TARGETS.indexOfFirst { it.first == r.code } }
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}
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private fun parseAmount(s: String): Double? =
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s.filter { it != ',' && !it.isWhitespace() }.takeIf { it.isNotEmpty() }?.toDoubleOrNull()
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private fun roundHalfUp(v: Double): BigDecimal =
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BigDecimal.valueOf(v).setScale(0, RoundingMode.HALF_UP)
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private fun formatTwd(v: Double): String =
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DecimalFormat("#,##0").format(roundHalfUp(v))
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private fun formatTwdRaw(v: Double): String =
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roundHalfUp(v).toPlainString()
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class MainActivity : ComponentActivity() {
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContent {
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MaterialTheme {
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App()
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}
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}
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}
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}
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@OptIn(ExperimentalMaterial3Api::class)
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@Composable
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private fun App() {
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val scope = rememberCoroutineScope()
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val context = LocalContext.current
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var rates by remember { mutableStateOf<List<Rate>>(emptyList()) }
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val amounts = remember {
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mutableStateMapOf<String, String>().apply {
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TARGETS.forEach { put(it.first, "100") }
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}
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}
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var loading by remember { mutableStateOf(false) }
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var error by remember { mutableStateOf<String?>(null) }
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var fetchedAt by remember { mutableStateOf<String?>(null) }
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fun load() {
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if (loading) return
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loading = true
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error = null
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scope.launch {
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try {
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val r = withContext(Dispatchers.IO) { fetchRates() }
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if (r.isEmpty()) {
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error = "解析結果為空"
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} else {
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rates = r
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fetchedAt = SimpleDateFormat("yyyy-MM-dd HH:mm:ss", Locale.US)
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.format(Date())
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}
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} catch (e: Exception) {
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error = e.message ?: "載入失敗"
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} finally {
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loading = false
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}
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}
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}
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LaunchedEffect(Unit) { load() }
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Scaffold(
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topBar = { TopAppBar(title = { Text("台銀 即期賣出") }) }
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) { padding ->
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Column(
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modifier = Modifier
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.padding(padding)
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.padding(16.dp)
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.fillMaxSize()
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) {
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Text(
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"輸入外幣金額，下方顯示台幣換算",
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fontSize = 12.sp,
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color = Color.Gray
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)
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Spacer(Modifier.height(12.dp))
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val display = rates.ifEmpty {
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TARGETS.map { Rate(it.first, it.second, Double.NaN) }
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}
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display.forEachIndexed { idx, r ->
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if (idx > 0) {
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HorizontalDivider(Modifier.padding(vertical = 8.dp))
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}
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RateRow(
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rate = r,
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amount = amounts[r.code] ?: "",
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onAmountChange = { amounts[r.code] = it },
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onCopy = { raw ->
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val cm = context.getSystemService(Context.CLIPBOARD_SERVICE)
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as ClipboardManager
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cm.setPrimaryClip(ClipData.newPlainText("TWD", raw))
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Toast.makeText(context, "已複製 $raw", Toast.LENGTH_SHORT).show()
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}
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)
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}
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Spacer(Modifier.height(16.dp))
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Row(verticalAlignment = Alignment.CenterVertically) {
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val status = when {
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error != null -> "載入失敗：$error"
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loading -> "載入中…"
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fetchedAt != null -> "更新時間：$fetchedAt"
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else -> ""
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}
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Text(
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status,
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fontSize = 11.sp,
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color = if (error != null) Color(0xFFB91C1C) else Color.Gray,
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modifier = Modifier.weight(1f)
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)
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Button(onClick = { load() }, enabled = !loading) {
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Text("重新整理")
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}
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}
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}
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}
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}
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@Composable
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private fun RateRow(
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rate: Rate,
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amount: String,
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onAmountChange: (String) -> Unit,
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onCopy: (String) -> Unit
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) {
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val rateText = if (rate.rate.isNaN()) "--" else "%.4f".format(rate.rate)
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val parsed = parseAmount(amount)
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val twd = if (parsed != null && !rate.rate.isNaN()) parsed * rate.rate else null
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val twdText = twd?.let { "NT$ ${formatTwd(it)}" } ?: "NT$ --"
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Column(modifier = Modifier.fillMaxWidth()) {
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Row(verticalAlignment = Alignment.CenterVertically) {
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Column(Modifier.width(110.dp)) {
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Text(
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"${rate.name} ${rate.code}",
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fontWeight = FontWeight.Bold,
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fontSize = 14.sp
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)
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Text(
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rateText,
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fontSize = 12.sp,
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fontFamily = FontFamily.Monospace,
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color = Color(0xFF0F766E)
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)
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}
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Spacer(Modifier.width(8.dp))
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OutlinedTextField(
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value = amount,
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onValueChange = onAmountChange,
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keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number),
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singleLine = true,
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modifier = Modifier.fillMaxWidth(),
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textStyle = TextStyle(fontFamily = FontFamily.Monospace)
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)
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}
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Spacer(Modifier.height(6.dp))
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Row(
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verticalAlignment = Alignment.CenterVertically,
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horizontalArrangement = Arrangement.End,
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modifier = Modifier.fillMaxWidth()
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) {
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Text(
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twdText,
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modifier = Modifier.weight(1f),
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fontWeight = FontWeight.Bold,
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fontSize = 16.sp,
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color = Color(0xFFB45309),
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fontFamily = FontFamily.Monospace
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)
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Button(
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onClick = { twd?.let { onCopy(formatTwdRaw(it)) } },
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enabled = twd != null,
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contentPadding = PaddingValues(horizontal = 14.dp, vertical = 4.dp)
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) {
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Text("複製", fontSize = 12.sp)
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}
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}
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}
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}
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