package hello

import (
	"encoding/json"
	"fmt"
	"log"
	"net/http"

	"github.com/OpenFunction/functions-framework-go/functions"
)

// RequestData represents the JSON structure for incoming requests
type RequestData struct {
	A int `json:"a"`
	B int `json:"b"`
}

func init() {
	functions.HTTP("Main", Main,
		functions.WithFunctionPath("/"))
}

// Main handles HTTP requests and processes the data
func Main(w http.ResponseWriter, r *http.Request) {
	log.Println("Function called with request")

	// Decode the JSON body into the RequestData struct
	var data RequestData
	err := json.NewDecoder(r.Body).Decode(&data)
	if err != nil {
		http.Error(w, "Invalid JSON payload", http.StatusBadRequest)
		log.Println("Error decoding JSON:", err)
		return
	}

	log.Printf("Received data: %+v\n", data)

	// Compute the result
	result := data.A + data.B

	// Prepare the response
	response := map[string]int{"result": result}

	// Encode the response as JSON
	w.Header().Set("Content-Type", "application/json")
	err = json.NewEncoder(w).Encode(response)
	if err != nil {
		http.Error(w, "Error encoding response", http.StatusInternalServerError)
		log.Println("Error encoding JSON:", err)
		return
	}

	log.Println("Response sent successfully")
}