package main

import (
	"flag"
	"io/ioutil"
	"log"
	"math/rand"
	"net/http"
	"regexp"
	"strconv"
	"strings"

	"github.com/hamcha/tg"
)

const KYMURL = "http://knowyourmeme.com/memes/it-s-finally-a-friday/photos/page/2"
const Search = "data-src=\"([^\"]*)masonry([^\"]*)\""

func assert(err error) {
	if err != nil {
		panic(err)
	}
}

func main() {
	brokerAddr := flag.String("broker", "localhost:7314", "Broker address:port")
	chatId := flag.Int64("chatId", -1001063099772, "Chat to write to")
	flag.Parse()

	broker, err := tg.ConnectToBroker(*brokerAddr)
	assert(err)
	log.Println("Connected to broker")
	defer broker.Close()

	resp, err := http.Get(KYMURL)
	assert(err)
	log.Println("Got KYM page")

	data, err := ioutil.ReadAll(resp.Body)
	assert(err)
	resp.Body.Close()

	r := regexp.MustCompile(Search)
	urls := r.FindAllString(string(data), -1)
	// Process urls
	for i := range urls {
		// Take out prefix/suffix and get original instead of thumb
		urls[i] = strings.Replace(urls[i][10:len(urls[i])-1], "masonry", "original", 1)
	}

	urlcount := len(urls)

	for attempt := 0; attempt < 10; attempt += 1 {
		imgindex := rand.Int() % urlcount
		chosen := urls[imgindex]
		log.Println("Trying " + chosen)

		resp, err := http.Get(chosen)
		if err != nil {
			log.Println("Cannot GET url, trying new image")
			continue
		}

		data, err := ioutil.ReadAll(resp.Body)
		resp.Body.Close()
		if err != nil {
			log.Println("Cannot read data, trying new image")
			continue
		}
		log.Println("Read " + strconv.Itoa(len(data)) + " bytes from " + chosen)

		ctype := strings.SplitN(resp.Header.Get("Content-Type"), "/", 2)
		if len(ctype) < 2 {
			log.Println("Cannot read type (" + resp.Header.Get("Content-Type") + "), trying new image")
			continue
		} else {
			// DOES THIS FIX THINGS??
			ctype[1] = strings.Replace(ctype[1], "jpeg", "jpg", 1)
		}
		log.Println("Type is " + ctype[1])

		broker.SendPhoto(&tg.APIChat{ChatID: *chatId}, data, "jojo."+ctype[1], "IT IS FRIDAY MY DUDES", nil)

		log.Println("Sent SendPhoto request to " + strconv.FormatInt(*chatId, 10))
		return
	}

	log.Fatalln("FRIDAY has failed, too many attemps")
}