package main

import (
	"fmt"
	"net/http"
	"os/exec"
)

func openBrowser(url string) error {
	cmd := exec.Command("xdg-open", url)
	return cmd.Start()
}

func startServer(codeChannel chan string) {
	// Step 5: Start a web server that listens on localhost:3000
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		// Extract the code parameter from the query string
		code := r.URL.Query().Get("code")
		if code != "" {
			// Send the authorization code to the channel
			codeChannel <- code

			// Respond to the browser
			fmt.Fprintf(w, "Authorization successful! You can now close this window.")
		} else {
			// If there's no code, display an error
			http.Error(w, "Authorization failed", http.StatusBadRequest)
		}
	})

	// Start the server
	err := http.ListenAndServe(":3000", nil)
	if err != nil {
		fmt.Printf("Error starting server: %v\n", err)
	}
}

func GetOAuth(clientID string) (string, error) {
	// Step 1: Construct the URL with the provided client_id
	url := fmt.Sprintf("https://id.twitch.tv/oauth2/authorize?response_type=code&client_id=%s&redirect_uri=http://localhost:3000&scope=user%%3Aread%%3Afollows&state=xsscheckbasic101", clientID)

	// Step 2: Open the URL in the default web browser using xdg-open
	err := openBrowser(url)
	if err != nil {
		return "", fmt.Errorf("failed to open browser: %v", err)
	}

	// Step 3: Start the HTTP server to capture the response
	codeChannel := make(chan string)
	go startServer(codeChannel)

	// Step 4: Wait for the authorization code to be received
	code := <-codeChannel

	// Return the authorization code
	return code, nil
}