package helix

import (
	"net/http"

	helixClient "github.com/nicklaw5/helix"
	log "github.com/sirupsen/logrus"
)

// Client wrapper for helix
type Client struct {
	clientID   string
	client     *helixClient.Client
	httpClient *http.Client
}

var (
	userCacheByID       map[string]*UserData
	userCacheByUsername map[string]*UserData
)

func init() {
	userCacheByID = map[string]*UserData{}
	userCacheByUsername = map[string]*UserData{}
}

// NewClient Create helix client
func NewClient(clientID string) Client {
	client, err := helixClient.NewClient(&helixClient.Options{
		ClientID: clientID,
	})
	if err != nil {
		panic(err)
	}

	return Client{
		clientID:   clientID,
		client:     client,
		httpClient: &http.Client{},
	}
}

type userResponse struct {
	Data []UserData `json:"data"`
}

// UserData exported data from twitch
type UserData struct {
	ID              string `json:"id"`
	Login           string `json:"login"`
	DisplayName     string `json:"display_name"`
	Type            string `json:"type"`
	BroadcasterType string `json:"broadcaster_type"`
	Description     string `json:"description"`
	ProfileImageURL string `json:"profile_image_url"`
	OfflineImageURL string `json:"offline_image_url"`
	ViewCount       int    `json:"view_count"`
	Email           string `json:"email"`
}

// GetUsersByUserIds receive userData for given ids
func (c *Client) GetUsersByUserIds(userIDs []string) (map[string]UserData, error) {
	var filteredUserIDs []string

	for _, id := range userIDs {
		if _, ok := userCacheByID[id]; !ok {
			filteredUserIDs = append(filteredUserIDs, id)
		}
	}

	if len(filteredUserIDs) > 0 {
		resp, err := c.client.GetUsers(&helixClient.UsersParams{
			IDs: filteredUserIDs,
		})
		if err != nil {
			return map[string]UserData{}, err
		}

		log.Infof("%d GetUsersByUserIds %v", resp.StatusCode, filteredUserIDs)

		for _, user := range resp.Data.Users {
			data := &UserData{
				ID:              user.ID,
				Login:           user.Login,
				DisplayName:     user.Login,
				Type:            user.Type,
				BroadcasterType: user.BroadcasterType,
				Description:     user.Description,
				ProfileImageURL: user.ProfileImageURL,
				OfflineImageURL: user.OfflineImageURL,
				ViewCount:       user.ViewCount,
				Email:           user.Email,
			}
			userCacheByID[user.ID] = data
			userCacheByUsername[user.Login] = data
		}
	}

	result := make(map[string]UserData)

	for _, id := range userIDs {
		result[id] = *userCacheByID[id]
	}

	return result, nil
}

// GetUsersByUsernames fetches userdata from helix
func (c *Client) GetUsersByUsernames(usernames []string) (map[string]UserData, error) {
	var filteredUsernames []string

	for _, username := range usernames {
		if _, ok := userCacheByUsername[username]; !ok {
			filteredUsernames = append(filteredUsernames, username)
		}
	}

	if len(filteredUsernames) > 0 {
		resp, err := c.client.GetUsers(&helixClient.UsersParams{
			Logins: filteredUsernames,
		})
		if err != nil {
			return map[string]UserData{}, err
		}

		log.Infof("%d GetUsersByUsernames %v", resp.StatusCode, filteredUsernames)

		for _, user := range resp.Data.Users {
			data := &UserData{
				ID:              user.ID,
				Login:           user.Login,
				DisplayName:     user.Login,
				Type:            user.Type,
				BroadcasterType: user.BroadcasterType,
				Description:     user.Description,
				ProfileImageURL: user.ProfileImageURL,
				OfflineImageURL: user.OfflineImageURL,
				ViewCount:       user.ViewCount,
				Email:           user.Email,
			}
			userCacheByID[user.ID] = data
			userCacheByUsername[user.Login] = data
		}
	}

	result := make(map[string]UserData)

	for _, username := range usernames {
		result[username] = *userCacheByUsername[username]
	}

	return result, nil
}