package main

import (
	"bufio"
	"fmt"
	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
	"math/rand"
	"net/http"
	"os"
	"strings"
	"time"
)

var nouns = []string{}
var verbs = []string{}
var ends = []string{}
var nends = []string{}

func init() {
	rand.Seed(time.Now().UnixNano())
	nouns, _ = readFile("nouns.txt")
	verbs, _ = readFile("verbs.txt")
	ends, _ = readFile("ends.txt")
	nends = append(nouns, ends...)
}

func readFile(path string) ([]string, error) {
	file, err := os.Open(path)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	var lines []string
	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		lines = append(lines, scanner.Text())
	}
	return lines, scanner.Err()
}

func getWord(wordlist []string) string {
	return wordlist[rand.Intn(len(wordlist))]
}

func genSwear() string {
	swear := "default"
	r := rand.Intn(4)
	switch r {
	case 1:
		swear = getWord(nouns) + "-" + getWord(verbs) + " " + getWord(nends)
	case 2:
		swear = getWord(nouns) + "-" + getWord(ends)
	case 3:
		swear = getWord(nouns) + "-" + getWord(verbs) + " " + getWord(nouns) + " " + getWord(ends)
	default:
		swear = getWord(nouns) + "-" + getWord(nends)
	}
	return strings.Title(swear)
}

func HandleRequest() (events.APIGatewayProxyResponse, error) {
	return events.APIGatewayProxyResponse{
		StatusCode: http.StatusOK,
		Body:       fmt.Sprintf(genSwear()),
	}, nil
}

func main() {
	lambda.Start(HandleRequest)
}