package handler

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

	"go.etztech.xyz/lurk/config"

	"github.com/dghubble/go-twitter/twitter"
	"go.jolheiser.com/beaver"
)

type Twitter struct {
	Filter config.Filter
	Stream *twitter.Stream
}

func (t *Twitter) Run() {
	beaver.Debugf("setting up stream for %v", t.Filter)
	demux := twitter.NewSwitchDemux()
	demux.Tweet = func(tweet *twitter.Tweet) {
		beaver.Debugf("new tweet for %v", t.Filter)
		if t.Filter.FollowStrict {
			var match bool
			for _, id := range t.Filter.Follows {
				if id == tweet.User.IDStr {
					match = true
					break
				}
			}
			if !match {
				beaver.Debug("tweet did not match any follow IDs")
				return
			}
		}
		if err := t.Discord(tweet); err != nil {
			beaver.Error(err)
		}
	}

	beaver.Debugf("streaming %v", t.Filter)
	demux.HandleChan(t.Stream.Messages)
	beaver.Debugf("disconnected from stream: %v", t.Filter)
}

func (t *Twitter) Discord(tweet *twitter.Tweet) error {
	e := map[string]string{
		"content": fmt.Sprintf("https://twitter.com/%d/status/%d", tweet.User.ID, tweet.ID),
	}
	data, err := json.Marshal(e)
	if err != nil {
		return err
	}
	beaver.Debug(string(data))

	if t.Filter.Webhook == "" {
		return fmt.Errorf("no webhook for %s", t.Filter)
	}

	payload := bytes.NewBuffer(data)
	resp, err := httpClient.Post(t.Filter.Webhook, "application/json", payload)
	if err != nil {
		return err
	}

	if resp.StatusCode != http.StatusNoContent {
		return err
	}

	return nil
}