package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	"os"
	"strings"
)

func main() {
	http.HandleFunc("/check-maths-user", CheckMathsUserHandler)
	port := ":8080"

	fmt.Printf("Listening on port %s...\n", port)
	http.ListenAndServe(port, nil)
}

func CheckMathsUserHandler(w http.ResponseWriter, r *http.Request) {
	// Get the SANITIZED_USER from the query parameters
	sanitizedUser := r.URL.Query().Get("SANITIZED_USER")

	// Get the AUTHORIZATION header value, which should include the secret token
	authHeader := r.Header.Get("Authorization")
	expectedAuthHeader := "Bearer " + os.Getenv("SECRET")

	// Check if the provided authorization header matches the expected secret token
	if authHeader != expectedAuthHeader {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	// Get the AUTHPDS_TOKEN from an environment variable
	authPdsToken := os.Getenv("AUTHPDS_TOKEN")

	// Make a GET request to the external API
	apiURL := fmt.Sprintf("https://api.unipi.it/authPds/api/Carriera/studente/uid/%s/", sanitizedUser)
	req, err := http.NewRequest("GET", apiURL, nil)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	req.Header.Add("accept", "*/*")
	req.Header.Add("Authorization", "Bearer "+authPdsToken)

	// Execute the request
	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	defer resp.Body.Close()

	// Check if the response contains the desired keywords
	body := make([]byte, 0)
	_, err = resp.Body.Read(body)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	containsKeywords := false
	keywords := []string{"MATEMATICA", "Mobilit", "Transizione"}
	for _, keyword := range keywords {
		if strings.Contains(string(body), keyword) {
			containsKeywords = true
			break
		}
	}

	// Create a JSON response
	response := map[string]bool{
		"result": containsKeywords,
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(response)
}