/**
 * spi.js - SPI 帧构建与发送
 *
 * 从 app.js 的「SPI 发送」段提取。
 * 操作 DOM: #spiType / #spiData / #spiTimeout / #spiHint / #spiResp / #spiRespText
 *
 * 未拆分的函数（通过 window.* 引用）：
 *   window.getBaseUrl / window.showToast / window.addLog
 */
import { showToast } from '../common/toast.js';
import { addLog } from '../common/log.js';

function updateSpiHint() {
  var typeHex = document.getElementById('spiType').value.trim();
  var dataHex = document.getElementById('spiData').value.trim().replace(/\s/g, '');
  var hint = document.getElementById('spiHint');
  if (!typeHex || !/^[0-9a-fA-F]{1,2}$/.test(typeHex)) {
    hint.className = 'helper-note err';
    hint.innerHTML = 'type 需填 1 字节 hex（如 01, B0）。';
    return;
  }
  if (dataHex && !/^[0-9a-fA-F]*$/.test(dataHex)) {
    hint.className = 'helper-note err';
    hint.innerHTML = '数据包含非 HEX 字符。';
    return;
  }
  if (dataHex && dataHex.length % 2 !== 0) {
    hint.className = 'helper-note err';
    hint.innerHTML = 'HEX 长度必须为偶数。';
    return;
  }
  var bytes = dataHex ? dataHex.length / 2 : 0;
  var totalOnWire = 5 + bytes;
  hint.className = 'helper-note ok';
  hint.innerHTML = 'type=<code>0x' + typeHex.toUpperCase() + '</code>' +
    (bytes > 0 ? '，payload: <b>' + bytes + '</b>B' : '，无 payload') +
    '，线上 <b>' + totalOnWire + '</b>B（SOF+TYPE+LEN+PAYLOAD+CRC）';
}

export async function sendSpiFrame() {
  var typeHex = document.getElementById('spiType').value.trim();
  var dataStr = document.getElementById('spiData').value.trim();
  var timeout = parseInt(document.getElementById('spiTimeout').value) || 1000;
  if (!typeHex || !/^[0-9a-fA-F]{1,2}$/.test(typeHex)) {
    showToast('type 需填 1 字节 hex', 'error');
    return;
  }
  var dataHex = dataStr.replace(/\s/g, '');
  if (dataHex && !/^[0-9a-fA-F]*$/.test(dataHex)) {
    showToast('数据包含非 HEX 字符', 'error');
    return;
  }
  if (dataHex && dataHex.length % 2 !== 0) {
    showToast('HEX 数据长度必须为偶数', 'error');
    return;
  }
  var txBytes = dataHex ? dataHex.length / 2 : 0;
  addLog('I', 'SPI', 'type=0x' + typeHex.toUpperCase() +
    (txBytes > 0 ? ', payload=' + dataHex.toUpperCase() : ', 无负载'));
  var body = { type: typeHex, data: dataHex.toUpperCase(), timeout_ms: timeout };
  try {
    var resp = await fetch(window.getBaseUrl() + '/spi/send', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(body),
      signal: AbortSignal.timeout(timeout + 2000)
    });
    var result = await resp.json();
    if (result.status === 'ok') {
      var recvHex = result.recv || '';
      var respTypeName = {'80': 'ACK', '81': 'WAIT', '82': 'ERROR'};
      var respTypeLabel = respTypeName[result.resp_type] || ('0x' + result.resp_type);
      addLog('I', 'SPI', '→ ' + respTypeLabel +
        (recvHex ? ' 0x' + recvHex : '') + ' (' + (result.resp_len || 0) + 'B)');
      var rd = document.getElementById('spiResp');
      rd.style.display = 'block';
      document.getElementById('spiRespText').textContent =
        'type=0x' + result.type + ' payload=' + result.payload_len + 'B → ' + respTypeLabel +
        (recvHex ? ' 0x' + recvHex : '') +
        ' (' + (result.resp_len || 0) + 'B)';
      showToast('SPI 发送成功', 'success');
    } else {
      addLog('E', 'SPI', '发送失败: code=' + result.code + ' ' + (result.message || ''));
      var rd = document.getElementById('spiResp');
      rd.style.display = 'block';
      document.getElementById('spiRespText').textContent =
        '错误: code=' + result.code + ' ' + (result.message || '');
      showToast('SPI 发送失败', 'error');
    }
  } catch (e) {
    addLog('E', 'SPI', '发送失败: ' + e.message);
    showToast('SPI 发送失败: ' + e.message, 'error');
  }
}

export function clearSpiFields() {
  document.getElementById('spiType').value = '01';
  document.getElementById('spiData').value = '';
  document.getElementById('spiTimeout').value = '1000';
  document.getElementById('spiResp').style.display = 'none';
  updateSpiHint();
}

// 导出 updateSpiHint 供入口挂载 window.updateSpiHint
export { updateSpiHint };