package discord

import (
	"encoding/json"
	"errors"
	"io/ioutil"
	"net/http"

	"github.com/rs/zerolog/log"
)

const (
	dadJokeAPI = "https://icanhazdadjoke.com/"
	dadJokeErr = "Could not get a Dad joke. :slight_frown:"
)

type dadJoke struct {
	ID     string `json:"id"`
	Joke   string `json:"joke"`
	Status int    `json:"status"`
}

func init() {
	commands = append(commands, &command{
		name: "dad",
		validate: func(cmd commandInit) bool {
			return true
		},
		run: func(cmd commandInit) (string, error) {
			if !memeRateLimit.Try() {
				return "", nil
			}

			dj, err := newDadJoke()
			if err != nil {
				log.Warn().Msgf("error getting new dad joke: %v", err)
				return dadJokeErr, nil
			}

			return dj.Joke, nil
		},
		help: "Get a random Dad joke",
	})
}

func newDadJoke() (*dadJoke, error) {
	req, err := http.NewRequest(http.MethodGet, dadJokeAPI, nil)
	if err != nil {
		return nil, err
	}
	req.Header.Add("Accept", "application/json")

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		return nil, err
	}

	if resp.StatusCode != http.StatusOK {
		return nil, errors.New("non-ok status")
	}

	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return nil, err
	}

	var dj *dadJoke
	if err := json.Unmarshal(body, &dj); err != nil {
		return nil, errors.New("could not unmarshal")
	}

	// Check status again, in case API returned an error
	if dj.Status != http.StatusOK {
		return nil, errors.New("API error")
	}

	return dj, nil
}