package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
)

// index is a function that handles all requests to the main page
// Note that there are two separate returns
func index(w http.ResponseWriter, r *http.Request) {
	if r.Method == "POST" {

		body, err := ioutil.ReadAll(r.Body)
		if err != nil {
			fmt.Printf("Error: %s\n", err)
		}

		var bsOpt, mcOpt Option
		json.Unmarshal(body, &bsOpt)
		json.Unmarshal(body, &mcOpt)

		// Cap the number of simulations at 10M
		if bsOpt.Sims > 1e7 || mcOpt.Sims > 1e7 {
			bsOpt.Sims = 1e7
			mcOpt.Sims = 1e7
		}

		mcOpt.PriceMonteCarlo()
		bsOpt.PriceClosedForm()

		options := make(map[string]Option)
		options["MonteCarlo"] = mcOpt
		options["ClosedForm"] = bsOpt

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

	} else if r.Method == "GET" {
		http.ServeFile(w, r, "./templates/index.html")
	}

}

func main() {
	// Serve index.html
	http.HandleFunc("/", index)
	// Serve all the assets
	http.Handle("/assets/", http.StripPrefix("/assets/", http.FileServer(http.Dir("./templates/assets"))))
	http.ListenAndServe(":8080", nil)
}