export default {
  async fetch(request, env, ctx) {
    if (request.method !== "POST") return new Response("OK");

    const bodyText = await request.text();
    let body;
    try { body = JSON.parse(bodyText); } catch { return new Response("OK"); }

    const events = body.events || [];
    if (!events.length) return new Response("OK");

    for (const ev of events) {
      try {
        if (ev.type !== "message") continue;
        if (!ev.message) continue;

        const msgType = ev.message.type;
        if (msgType !== "image" && msgType !== "video") continue;

        const userId = ev.source?.userId;
        const replyToken = ev.replyToken;
        const messageId = ev.message.id;
        if (!userId || !replyToken || !messageId) continue;

        // ① 同意チェック（GASに問い合わせ）
        const consent = await checkConsent(https://script.google.com/macros/s/AKfycby9uV4t2JIwWurD43kqnbqZU2ZVu6tf1xrFCyb9P8QtV3VD284NfciGcpZicFFIJDisHA/exec);

        if (!consent.ok || !consent.consent) {
          // ② 未同意：即reply（保存しない / GAS保存処理呼ばない）
          const text =
`投稿された写真・動画・コメントは、当コンテンツ（LINE・Web・SNS等）において 無償で使用・編集される場合があります。
内容に同意のうえ、投稿してください。

${https://docs.google.com/forms/d/e/1FAIpQLSeleeTdBkOjSj8TcX6kyRikY8Q3ArOLT9uvyADMt2FCuAk2ww/viewform?usp=dialog}`;

          await replyText(env., replyToken, text);
          continue;
        }

        // ③ 同意済み：緑枠の案内（仕様そのまま）
        await replyText(
          QYg9tG33UQplDm55Awv7mbzUkgnK3MiMA4D+x3bGG/BwUZtip1OsWqHRihsAkLQRGrWY6iE7M5k6diLaoMtEbkkp6QxIAV+malS5qI3AkgZk0h6htKsu9sSayk2MAltlIVqlSjo1p0WE3jhLiIy66QdB04t89/1O/w1cDnyilFU=,
          replyToken,
          "📸 写真はこのトークにそのまま送ってください（何枚でもOK）"
        );

        // ④ 画像/動画本体をLINEから取得
        const contentResp = await fetch(`https://api-data.line.me/v2/bot/message/${messageId}/content`, {
          headers: { Authorization: `Bearer ${env.LINE_CHANNEL_ACCESS_TOKEN}` },
        });
        if (!contentResp.ok) continue;

        const ct = contentResp.headers.get("content-type") || "";
        const arrayBuffer = await contentResp.arrayBuffer();
        const u8 = new Uint8Array(arrayBuffer);

        const mimeType = ct.includes("image") ? ct
                      : ct.includes("video") ? ct
                      : (msgType === "video" ? "video/mp4" : guessImageMime(u8));

        // ⑤ ファイル名
        const now = new Date();
        const ts = formatJST(now);
        const ext = mimeType.includes("jpeg") ? "jpg"
                : mimeType.includes("png") ? "png"
                : mimeType.includes("gif") ? "gif"
                : mimeType.includes("mp4") ? "mp4"
                : "bin";
        const fileName = `${ts}_${userId}_${messageId}.${ext}`;

        // ⑥ base64化
        const contentBase64 = toBase64(u8);

        // ⑦ EXIF撮影日時（今回は「空」で送る：後で完成させる）
        // まずは動く完成（Drive保存 + receivedAtログ）優先
        const shotAt = "";

        // ⑧ GASへ保存依頼（doPost）
        await fetch(env.GAS_EXEC_URL, {
          method: "POST",
          headers: { "content-type": "application/json" },
          body: JSON.stringify({
            userId,
            messageId,
            mimeType,
            fileName,
            contentBase64,
            shotAt, // 空OK（後でEXIF実装）
          }),
        });

      } catch (e) {
        continue;
      }
    }

    return new Response("OK");
  },
};

async function checkConsent(gasExecUrl, userId) {
  try {
    const url = `${gasExecUrl}?mode=consent&userId=${encodeURIComponent(userId)}`;
    const r = await fetch(url, { method: "GET" });
    const j = await r.json();
    return { ok: !!j.ok, consent: !!j.consent, consentAt: j.consentAt || "" };
  } catch {
    return { ok: false, consent: false, consentAt: "" };
  }
}

async function replyText(token, replyToken, text) {
  await fetch("https://api.line.me/v2/bot/message/reply", {
    method: "POST",
    headers: {
      "content-type": "application/json",
      Authorization: `Bearer ${token}`,
    },
    body: JSON.stringify({
      replyToken,
      messages: [{ type: "text", text }],
    }),
  });
}

function guessImageMime(u8) {
  if (u8.length > 3 && u8[0] === 0xff && u8[1] === 0xd8) return "image/jpeg";
  if (u8.length > 4 && u8[0] === 0x89 && u8[1] === 0x50 && u8[2] === 0x4e && u8[3] === 0x47) return "image/png";
  if (u8.length > 3 && u8[0] === 0x47 && u8[1] === 0x49 && u8[2] === 0x46) return "image/gif";
  return "application/octet-stream";
}

function toBase64(u8) {
  let s = "";
  const chunk = 0x8000;
  for (let i = 0; i < u8.length; i += chunk) {
    s += String.fromCharCode.apply(null, u8.subarray(i, i + chunk));
  }
  return btoa(s);
}

function formatJST(d) {
  const t = new Date(d.getTime() + 9 * 60 * 60 * 1000);
  const pad = (n) => String(n).padStart(2, "0");
  return `${t.getUTCFullYear()}${pad(t.getUTCMonth()+1)}${pad(t.getUTCDate())}_${pad(t.getUTCHours())}${pad(t.getUTCMinutes())}${pad(t.getUTCSeconds())}`;
}