const fs = require("fs");
const express = require("express");
const app = express();
const { exec } = require("child_process");
const nodeMailer = require("nodemailer");

// Read configuration file
const contentFile = fs.readFileSync("./service_run/giteaService.conf", "utf8");
let checkStatus = "ready";

// Get port from configuration file
const PORT = contentFile
  .split("\n")
  .find(line => line.includes("PORT_SERVICE"))
  ?.split("=")[1]
  .trim() || 5000;

// Get email configuration from config file
const getConfigValue = (key) => contentFile
  .split("\n")
  .find(line => line.includes(key))
  ?.split("=")[1]
  .trim();

// Configure email transporter
const createTransporter = () => nodeMailer.createTransport({
  pool: true,
  host: getConfigValue("EMAIL_HOST") || "smtp.gmail.com",
  port: parseInt(getConfigValue("EMAIL_PORT") || "587"),
  secure: getConfigValue("EMAIL_SECURE") === "True",
  auth: {
    user: getConfigValue("EMAIL_USER") || "git@notification.com",
    pass: getConfigValue("EMAIL_PASSWORD") || "123456789",
  },
});

app.use(express.json());

app.post("/git/gitea-webhook", async (req, res) => {
  let title = "";
  const checkSendMail = getConfigValue("SEND_EMAIL");
  const emailAddress = getConfigValue("RECEIVE_EMAIL_ADDRESS");
  const emailFrom = getConfigValue("EMAIL_FROM") || "git@notification.com";
  const giteaEvent = req.headers["x-gitea-event"];

  // Return response immediately
  res.status(200).send({ mess: "The event has been received!", data: req.body });
  console.log("STATUS:", checkStatus);
  
  // Check if there is a running process
  if (checkStatus === "busy") {
    if (checkSendMail === "True") {
      const transporter = createTransporter();
      const options = {
        from: emailFrom,
        to: emailAddress,
        subject: "Git notifications (Fail)",
        html: "<h3>There is an active build process. Please check and push again in a few minutes.</h3>",
      };
      return transporter.sendMail(options);
    }
    return;
  }
  
  // Process new event
  console.log("New event: " + giteaEvent);
  checkStatus = "busy";
  
  exec("./service_run/giteaHook.sh", (error, stdout, stderr) => {
    let content = stdout || stderr;
    
    if (error) {
      console.log("Pull failed. Please check");
      console.log(`Error executing command: ${error}`);
      title = `New Git event: ${giteaEvent}`;
    } else {
      console.log(stdout);
      const hasError = [stderr, stdout].some(output => 
        output && (output.includes("Error") || output.includes("failed"))
      );
      
      title = `New Git event: ${giteaEvent}${hasError ? "" : " (success)"}`;
      
      // Reset status after 10 seconds
      setTimeout(() => {
        checkStatus = "ready";
      }, 10000);
    }

    // Send notification email if configured
    if (checkSendMail === "True") {
      const transporter = createTransporter();
      const options = {
        from: emailFrom,
        to: emailAddress,
        subject: title,
        html: `
          <h1>*** ${giteaEvent} event ***</h1>
          <h4>Committer: ${req.body.commits[0]?.committer.name || "N/A"}</h4>
          <h4>Message: ${req.body.commits[0]?.message || "N/A"}</h4>
          <h4>Branch: ${req.body.ref || "N/A"}</h4>
          ${req.body.commits[0]?.url ? `<a href='${req.body.commits[0].url}'>Link: ${req.body.commits[0].url}</a>` : ""}
          <h4>Process output:</h4>
          <textarea style='wordWrap:break-word; display: block; width:100%; height:70vh;border:solid 2px orange'>${content.replace(/error|fail|warning/gi, match => `<span style="background-color:yellow;color:red;font-weight:bold">${match}</span>`)}</textarea>
        `,
      };
      return transporter.sendMail(options);
    }
  });
});

app.listen(PORT, () => {
  console.log("Service is running on port", PORT);
});