let isRecording = false;
      let mediaRecorder;
      let audioChunks = [];
      let recordingInterval;
      let count_voice = 0;
      let before_rate = [];
      const RECORDING_INTERVAL_MS = 5000; // 5秒
      // メンバーとチャートの初期化
      let members = [];
      let voiceData = [];
      let baseMemberColors = ["#4caf50", "#007bff", "#ffc107", "#dc3545", "#28a745", "#9c27b0", "#ff9800"];
      // Chart.js の初期化
      const ctx = document.getElementById("speechChart").getContext("2d");
      const speechChart = new Chart(ctx, {
        type: "doughnut",
        data: {
          labels: members,
          datasets: [
            {
              data: voiceData,
              backgroundColor: getMemberColors(members.length),
            },
          ],
        },
        options: {
          responsive: true,
          plugins: {
            legend: {
              display: true,
              position: "bottom",
              labels: { color: "white" },
            },
          },
        },
      });
      // サーバーからメンバー情報を取得してチャートを更新する関数
      async function updateChartFrom() {
        try {
          const response = await fetch("/confirm");
          if (!response.ok) {
            throw new Error(`HTTP error! status: ${response.status}`);
          }
          const data = await response.json();
          if (!data || !data.members || !Array.isArray(data.members)) {
            console.error("Invalid member data received:", data);
            members = ["member1"];
            voiceData = [50, 50];
            updateChart();
            return;
          }
          members = data.members;
          voiceData = [];
          for (let i = 0; i < members.length; i++) {
            voiceData.push(100 / members.length);
          }
          updateChart();
        } catch (error) {
          console.error("Failed to fetch member data:", error);
          members = ["member1"];
          voiceData = [50, 50];
          updateChart();
        }
      }
      function updateChart() {
        // 一人モードの場合は、ユーザーとグレー（無音）の比率をチャートに表示
        if (members.length === 1) {
          const userName = members[0];
          speechChart.data.labels = [userName, "無音"];
          speechChart.data.datasets[0].backgroundColor = ["#4caf50", "#757575"];
        } else {
          // 複数メンバーの場合は通常通りの処理
          speechChart.data.labels = members;
          speechChart.data.datasets[0].backgroundColor = getMemberColors(members.length);
        }
        speechChart.data.datasets[0].data = voiceData;
        speechChart.update();
      }
       
      // ページ読み込み時にチャート情報を更新
      updateChartFrom();
      // 録音ボタンの録音開始／停止処理
      async function toggleRecording() {
        const recordButton = document.getElementById("recordButton");
        if (!isRecording) {
          // 録音開始
          isRecording = true;
          recordButton.classList.add("recording");
          try {
            const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
            mediaRecorder = new MediaRecorder(stream);
            audioChunks = [];
            mediaRecorder.ondataavailable = (event) => {
              if (event.data.size > 0) {
                audioChunks.push(event.data);
              }
            };
            mediaRecorder.onstop = () => {
              sendAudioChunks([...audioChunks]);
              audioChunks = [];
            };
            mediaRecorder.start();
            // 5秒ごとに録音を停止して送信するインターバルを設定
            recordingInterval = setInterval(() => {
              if (mediaRecorder && mediaRecorder.state === "recording") {
                mediaRecorder.stop();
                mediaRecorder.start();
              }
            }, RECORDING_INTERVAL_MS);
          } catch (error) {
            console.error("マイクへのアクセスに失敗しました:", error);
            isRecording = false;
            recordButton.classList.remove("recording");
          }
        } else {
          // 録音停止
          isRecording = false;
          recordButton.classList.remove("recording");
          if (mediaRecorder && mediaRecorder.state === "recording") {
            mediaRecorder.stop();
          }
          clearInterval(recordingInterval);
          count_voice = 0;
          //before_rate = [];
        }
      }
      function sendAudioChunks(chunks) {
        const audioBlob = new Blob(chunks, { type: "audio/wav" });
        const reader = new FileReader();
        reader.onloadend = () => {
          const base64String = reader.result.split(",")[1];
          const form = document.getElementById("recordForm");
          const nameInput = form.querySelector('input[name="name"]');
          const name = nameInput ? nameInput.value : "unknown";
          fetch("/upload_audio", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({ audio_data: base64String, name: name }),
          })
            .then((response) => response.json())
            .then((data) => {
              if (data.error) {
                alert("エラー: " + data.error);
                console.error(data.details);
              } else if (data.rate !== undefined) {
                updateChartData(data.rate);
              } else if (data.rates !== undefined) {
                updateChartData(data.rates);
              }
            })
            .catch((error) => {
              console.error("エラー:", error);
            });
        };
        reader.readAsDataURL(audioBlob);
      }
      function getMemberColors(memberCount) {
        // 一人モードの場合は特別な処理をしない（updateChartで処理するため）
        if (memberCount <= 1) {
          return ["#4caf50", "#757575"];
        } else {
          let colors = [];
          for (let i = 0; i < memberCount; i++) {
            colors.push(baseMemberColors[i % baseMemberColors.length]);
          }
          return colors;
        }
      }
      function updateChartData(newRate) {
        // 一人モードの時の処理
        if (members.length === 1) {
          if (count_voice === 0) {
            speechChart.data.datasets[0].data = [newRate, 100 - newRate];
            before_rate = [newRate];
          } else {
            // 一人モードでは、過去のデータと現在のデータを加重平均する
            let tmp_rate = (newRate + before_rate[0] * count_voice) / (count_voice + 1);
            speechChart.data.datasets[0].data = [tmp_rate, 100 - tmp_rate];
            before_rate = [tmp_rate];
          }
          count_voice++;
          // 一人モードでは常に緑色とグレーの組み合わせを使用
          speechChart.data.labels = [members[0], "無音"];
          speechChart.data.datasets[0].backgroundColor = ["#4caf50", "#757575"];
        } else {
          console.log(before_rate)
          // 複数人モードの処理
          if (!Array.isArray(newRate)) {
            console.error("newRate is not an array:", newRate);
            return;
          }
          if (newRate.length !== members.length) {
            console.error(
              "newRate length does not match members length:",
              newRate,
              members
            );
            return;
          }
          let averagedRates = new Array(newRate.length);
          for (let i = 0; i < newRate.length; i++) {
            let tmp_rate;
            if (count_voice === 0) {
              // 初回はそのまま
              tmp_rate = newRate[i];
            } else {
              // 2回目以降は、過去の平均値と現在の値を加重平均する
              tmp_rate = (newRate[i] + before_rate[i] * count_voice) / (count_voice + 1);
            }
            averagedRates[i] = tmp_rate;
          }
          // before_rateを更新
          before_rate = averagedRates;
          //グラフに反映
          speechChart.data.datasets[0].data = averagedRates;
          count_voice++;
          speechChart.data.datasets[0].backgroundColor = getMemberColors(
            members.length
          );
        }
        speechChart.update();
      }