package linkinfo

import (
	"github.com/dghubble/go-twitter/twitter"
	"github.com/dghubble/oauth1"
	"regexp"
	"strconv"
)

var (
	twitterHosts        = []string{"twitter.com"}
	twitterStatusRegexp = regexp.MustCompile("/status/(\\d+)")
)

type TwitterOptions struct {
	Option

	ConsumerKey    string
	ConsumerSecret string
	Token          string
	TokenSecret    string
}

type TwitterInfoApi struct {
	opts *TwitterOptions

	client *twitter.Client
}

func (i *TwitterInfoApi) Init() {
	config := oauth1.NewConfig(i.opts.ConsumerKey, i.opts.ConsumerSecret)
	token := oauth1.NewToken(i.opts.Token, i.opts.TokenSecret)

	i.client = twitter.NewClient(config.Client(oauth1.NoContext, token))
}

func (i *TwitterInfoApi) Handler(link string) (*LinkInfo, error) {
	m := twitterStatusRegexp.FindStringSubmatch(link)

	if m == nil {
		return nil, nil
	}

	id, err := strconv.ParseInt(m[1], 10, 64)

	if err != nil {
		return nil, err
	}

	tweet, _, err := i.client.Statuses.Show(id, nil)

	if err != nil {
		return nil, err
	}

	ret := &LinkInfo{
		Title:       tweet.User.Name + " on Twitter: " + tweet.Text,
		Description: tweet.Text,
	}

	return ret, nil
}