#!/usr/bin/env node

const fs = require("fs");
const https = require("https");
const { homedir } = require("os");
const { join } = require("path");

function httpsRequest(url, options = {}) {
  return new Promise((resolve, reject) => {
    const req = https.request(url, options, (res) => {
      let data = "";
      res.on("data", (chunk) => (data += chunk));
      res.on("end", () => {
        if (res.statusCode >= 400) {
          reject(new Error(`HTTP ${res.statusCode}: ${data}`));
        } else {
          resolve(JSON.parse(data));
        }
      });
    });
    req.on("error", reject);
    if (options.body) req.write(options.body);
    req.end();
  });
}

async function getAccessToken(creds) {
  const body = new URLSearchParams({
    client_id: creds.client_id,
    client_secret: creds.client_secret,
    refresh_token: creds.refresh_token,
    grant_type: "refresh_token",
  }).toString();

  const data = await httpsRequest("https://oauth2.googleapis.com/token", {
    method: "POST",
    headers: {
      "Content-Type": "application/x-www-form-urlencoded",
      "Content-Length": Buffer.byteLength(body),
    },
    body,
  });

  return data.access_token;
}

async function main() {
  const query = process.argv[2] || "Reservedele.nu FAKTURA 668926";

  const credsPath = join(homedir(), ".openclaw/secrets/google-oauth.json");
  const creds = JSON.parse(fs.readFileSync(credsPath, "utf8"));

  const accessToken = await getAccessToken(creds);

  console.log(`🔍 Searching for: "${query}"\n`);

  // Search for messages
  const searchUrl = `https://gmail.googleapis.com/gmail/v1/users/me/messages?q=${encodeURIComponent(query)}&maxResults=1`;

  const searchData = await httpsRequest(searchUrl, {
    headers: { Authorization: `Bearer ${accessToken}` },
  });

  if (!searchData.messages || searchData.messages.length === 0) {
    console.log("❌ No messages found");
    return;
  }

  const messageId = searchData.messages[0].id;
  console.log(`📧 Found message ID: ${messageId}\n`);

  // Get full message with attachments
  const msgUrl = `https://gmail.googleapis.com/gmail/v1/users/me/messages/${messageId}?format=full`;

  const msg = await httpsRequest(msgUrl, {
    headers: { Authorization: `Bearer ${accessToken}` },
  });

  // Parse headers
  const headers = {};
  for (const h of msg.payload.headers) {
    headers[h.name.toLowerCase()] = h.value;
  }

  console.log("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
  console.log(`From: ${headers.from || "Unknown"}`);
  console.log(`Subject: ${headers.subject || "No subject"}`);
  console.log(`Date: ${headers.date || "Unknown"}`);
  console.log("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\n");

  // Get body
  let body = "";

  function extractBody(part) {
    if (part.mimeType === "text/plain" && part.body?.data) {
      body += Buffer.from(part.body.data, "base64").toString("utf8");
    } else if (part.mimeType === "text/html" && !body && part.body?.data) {
      // Fallback to HTML if no plain text
      const html = Buffer.from(part.body.data, "base64").toString("utf8");
      // Strip HTML tags for basic display
      body += html
        .replace(/<[^>]*>/g, " ")
        .replace(/\s+/g, " ")
        .trim();
    }

    if (part.parts) {
      for (const subpart of part.parts) {
        extractBody(subpart);
      }
    }
  }

  extractBody(msg.payload);

  if (body) {
    console.log("📄 MESSAGE BODY:\n");
    console.log(body);
    console.log("\n");
  }

  // Check for attachments
  const attachments = [];

  function findAttachments(part) {
    if (part.filename && part.body?.attachmentId) {
      attachments.push({
        filename: part.filename,
        mimeType: part.mimeType,
        attachmentId: part.body.attachmentId,
        size: part.body.size,
      });
    }

    if (part.parts) {
      for (const subpart of part.parts) {
        findAttachments(subpart);
      }
    }
  }

  findAttachments(msg.payload);

  if (attachments.length > 0) {
    console.log("━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━");
    console.log(`📎 ATTACHMENTS (${attachments.length}):\n`);

    for (const att of attachments) {
      const sizeKB = (att.size / 1024).toFixed(2);
      console.log(`   ${att.filename} (${sizeKB} KB)`);
      console.log(`   Type: ${att.mimeType}`);

      // Download attachment
      const attUrl = `https://gmail.googleapis.com/gmail/v1/users/me/messages/${messageId}/attachments/${att.attachmentId}`;

      const attData = await httpsRequest(attUrl, {
        headers: { Authorization: `Bearer ${accessToken}` },
      });

      const buffer = Buffer.from(attData.data, "base64");
      const outputPath = `/tmp/${att.filename}`;
      fs.writeFileSync(outputPath, buffer);

      console.log(`   ✅ Downloaded to: ${outputPath}\n`);
    }
  }
}

main().catch((err) => {
  console.error("❌ Error:", err.message);
  process.exit(1);
});