const axios = require("axios");
const cheerio = require("cheerio");

function channelRouteHandler(app) {
  app.get("/api/channel/:username", async (req, res) => {
    try {
      const username = req.params.username;
      if (!username) {
        return res.status(400).json({ error: "Username is required" });
      }

      const response = await axios.get(`https://www.youtube.com/${username}`);
      const $ = cheerio.load(response.data);
      const canonicalLink = $('link[rel="canonical"]').attr("href");

      if (!canonicalLink) {
        return res.status(404).json({ error: "Channel not found" });
      }

      const channelIdMatch = canonicalLink.match(/\/channel\/([\w-]+)/);
      const channelId = channelIdMatch ? channelIdMatch[1] : null;

      if (!channelId) {
        return res.status(404).json({ error: "Could not extract channel ID" });
      }

      return res.json({
        channelId: channelId,
        username: username,
      });
    } catch (error) {
      console.error("Error fetching channel ID:", error.message);
      return res.status(500).json({
        error: "Failed to fetch channel ID",
        message: error.message,
      });
    }
  });
}

module.exports = channelRouteHandler;