package plug

import (
	"context"
	"git.anthrove.art/Anthrove/otter-space-sdk/v4/pkg/models"
	log "github.com/sirupsen/logrus"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/codes"
	"gorm.io/gorm"
)

type User struct {
	UserFavoriteCount int64
	UserName          string
	UserID            string
}

type Favorites struct {
	Posts    []models.Post
	NextPage string
	LastPage string
}

type Plug interface {
	// GetFavoritePage
	// The API Key can be an empty string if it's not supplied by the user, in this case the default API Key should be used
	GetFavoritePage(ctx context.Context, apiKey string, userSource models.UserSource, pageIdentifier string) (Favorites, error)

	// GetUserProfile
	// The API Key can be an empty string if it's not supplied by the user, in this case the default API Key should be used
	GetUserProfile(ctx context.Context, apiKey string, userSource models.UserSource) (User, error)
}

func Algorithm(ctx context.Context, plugInterface Plug, db *gorm.DB, userSource models.UserSource, deepScrape bool, apiKey string) (TaskSummery, error) {
	ctx, span := tracer.Start(ctx, "mainScrapeAlgorithm")
	defer span.End()

	span.SetAttributes(
		attribute.String("user_source_id", string(userSource.ID)),
		attribute.String("user_source_user_id", string(userSource.UserID)),
		attribute.String("user_source_source_id", string(userSource.SourceID)),
	)

	basicLoggingInfo := log.Fields{
		"user_source_id":        userSource.ID,
		"user_source_user_id":   userSource.UserID,
		"user_source_source_id": userSource.SourceID,
	}

	log.WithContext(ctx).WithFields(basicLoggingInfo).Info("Starting mainScrapeAlgorithm")

	taskSummery := TaskSummery{
		AddedPosts:   0,
		DeletedPosts: 0,
	}

	anthroveUserFavCount, err := getUserFavoriteCountFromDatabase(ctx, db, userSource.UserID, userSource.ID)
	if err != nil {
		span.RecordError(err)
		span.SetStatus(codes.Error, err.Error())
		log.WithContext(ctx).WithFields(basicLoggingInfo).WithError(err).Error("Failed to get user favorite count from db")
		return taskSummery, err
	}

	profile, err := plugInterface.GetUserProfile(ctx, apiKey, userSource)
	if err != nil {
		return taskSummery, err
	}

	nextPage := ""

outer:
	for anthroveUserFavCount < profile.UserFavoriteCount {
		select {
		case <-ctx.Done():
			break outer
		default:
			span.AddEvent("Executing getFavorites request")

			favorites, err := plugInterface.GetFavoritePage(ctx, apiKey, userSource, nextPage)
			span.AddEvent("Finished executing getFavorites request")

			if err != nil {
				span.RecordError(err)
				span.SetStatus(codes.Error, err.Error())
				log.WithContext(ctx).WithFields(basicLoggingInfo).WithError(err).Error("Failed to execute favorites page")
				return taskSummery, err
			}

			if len(favorites.Posts) <= 0 {
				span.AddEvent("No more favorites found")
				log.WithContext(ctx).WithFields(basicLoggingInfo).Info("No more favorites found")
				break outer
			}

			summery, err := BatchPostProcessingWithSummery(ctx, userSource, favorites.Posts)
			if err != nil {
				span.RecordError(err)
				span.SetStatus(codes.Error, err.Error())
				log.WithContext(ctx).WithFields(basicLoggingInfo).WithError(err).Error("Failed in BatchPostProcessing")
				return taskSummery, err
			}

			if summery.AddedFavorites != int64(len(favorites.Posts)) {
				span.AddEvent("user has no more favorites to add")
				break outer
			}

			nextPage = favorites.NextPage
			taskSummery.AddedPosts += int(summery.AddedFavorites)
		}
	}

	span.AddEvent("Completed scraping algorithm")
	log.WithContext(ctx).WithFields(basicLoggingInfo).Info("Completed scraping algorithm")
	return taskSummery, nil
}

// getUserFavoriteCountFromDatabase
func getUserFavoriteCountFromDatabase(ctx context.Context, gorm *gorm.DB, userID models.UserID, userSourceID models.UserSourceID) (int64, error) {
	var count int64

	err := gorm.WithContext(ctx).Model(&models.UserFavorite{}).Where("user_id = ? AND user_source_id = ?", userID, userSourceID).Count(&count).Error
	if err != nil {
		return count, err
	}

	return count, nil
}