package postgres

import (
	"context"
	"fmt"
	"git.dragse.it/anthrove/otter-space-sdk/pkg/models"
	"git.dragse.it/anthrove/otter-space-sdk/pkg/models/graphModels"
	log "github.com/sirupsen/logrus"
	"gorm.io/gorm"
)

func CreateUser(ctx context.Context, db *gorm.DB, anthroveUserID models.AnthroveUserID) error {

	if anthroveUserID == "" {
		return fmt.Errorf("anthroveUserID cannot be empty")
	}

	user := models.User{
		BaseModel: models.BaseModel{
			ID: string(anthroveUserID),
		},
	}

	err := db.WithContext(ctx).Create(&user).Error
	if err != nil {
		log.WithFields(log.Fields{
			"anthrove_user_id": anthroveUserID,
		}).Error("database: failed to create user")
		return err
	}

	return nil
}

func CreateUserNodeWithSourceRelation(ctx context.Context, db *gorm.DB, anthroveUserID models.AnthroveUserID, sourceDomain string, userID string, username string) error {

	if anthroveUserID == "" || username == "" || userID == "" {
		return fmt.Errorf("anthroveUserID cannot be empty")
	}

	user := models.User{
		BaseModel: models.BaseModel{
			ID: string(anthroveUserID),
		},
	}

	if err := db.WithContext(ctx).FirstOrCreate(&user).Error; err != nil {
		log.WithFields(log.Fields{
			"anthrove_user_id": anthroveUserID,
		}).Error("database: failed to find or create user")
		return err
	}

	source := models.Source{
		Domain: sourceDomain,
	}

	if err := db.WithContext(ctx).Where(&source).First(&source).Error; err != nil {
		log.WithFields(log.Fields{
			"source_domain": sourceDomain,
		}).Error("database: failed to find source")
		return err
	}

	userSource := models.UserSource{
		UserID:          user.ID,
		SourceID:        source.ID,
		AccountUsername: username,
		AccountID:       userID,
	}

	if err := db.WithContext(ctx).FirstOrCreate(&userSource).Error; err != nil {
		log.WithFields(log.Fields{
			"anthrove_user_id": anthroveUserID,
			"source_domain":    sourceDomain,
			"account_username": username,
			"account_id":       userID,
		}).Error("database: failed to create user-source relationship")
		return err
	}

	log.WithFields(log.Fields{
		"anthrove_user_id": anthroveUserID,
		"source_domain":    sourceDomain,
		"account_username": username,
		"account_id":       userID,
	}).Trace("database: created user-source relationship")

	return nil
}

func GetUserFavoritesCount(ctx context.Context, db *gorm.DB, anthroveUserID models.AnthroveUserID) (int64, error) {
	if anthroveUserID == "" {
		return 0, fmt.Errorf("anthroveUserID cannot be empty")
	}

	var count int64
	err := db.WithContext(ctx).Model(&models.UserFavorite{}).Where("user_id = ?", string(anthroveUserID)).Count(&count).Error
	if err != nil {
		log.WithFields(log.Fields{
			"anthrove_user_id": anthroveUserID,
		}).Error("database: failed to get user favorites count")
		return 0, err
	}

	log.WithFields(log.Fields{
		"anthrove_user_id":        anthroveUserID,
		"anthrove_user_fav_count": count,
	}).Trace("database: got user favorite count")

	return count, nil
}

func GetUserSourceLink(ctx context.Context, db *gorm.DB, anthroveUserID models.AnthroveUserID) (map[string]graphModels.AnthroveUserRelationship, error) {
	var userSources []models.UserSource
	userSourceMap := make(map[string]graphModels.AnthroveUserRelationship)

	err := db.WithContext(ctx).Model(&models.UserSource{}).Where("user_id = ?", string(anthroveUserID)).Find(&userSources).Error
	if err != nil {
		log.WithFields(log.Fields{
			"anthrove_user_id": anthroveUserID,
		}).Error("database: failed to get user source link")
		return nil, err
	}

	for _, userSource := range userSources {
		var source models.Source
		err = db.WithContext(ctx).Model(&models.Source{}).Where("id = ?", userSource.SourceID).First(&source).Error
		if err != nil {
			log.WithFields(log.Fields{
				"source_id": userSource.SourceID,
			}).Error("database: failed to get source")
			return nil, err
		}

		userSourceMap[source.DisplayName] = graphModels.AnthroveUserRelationship{
			UserID:   userSource.AccountID,
			Username: userSource.AccountUsername,
			Source: graphModels.AnthroveSource{
				DisplayName: source.DisplayName,
				Domain:      source.Domain,
				Icon:        source.Icon,
			},
		}
	}

	log.WithFields(log.Fields{
		"anthrove_user_id": anthroveUserID,
	}).Trace("database: got user source link")

	return userSourceMap, nil
}

func GetSpecifiedUserSourceLink(ctx context.Context, db *gorm.DB, anthroveUserID models.AnthroveUserID, sourceDisplayName string) (map[string]graphModels.AnthroveUserRelationship, error) {
	if anthroveUserID == "" || sourceDisplayName == "" {
		return nil, fmt.Errorf("anthroveUserID or sourceDisplayName is empty")
	}

	var userSources []models.UserSource
	userSourceMap := make(map[string]graphModels.AnthroveUserRelationship)

	err := db.WithContext(ctx).Model(&models.UserSource{}).InnerJoins("Source", db.Where("display_name = ?", sourceDisplayName)).Where("user_id = ?", string(anthroveUserID)).First(&userSources).Error
	if err != nil {
		log.WithFields(log.Fields{
			"anthrove_user_id":    anthroveUserID,
			"source_display_name": sourceDisplayName,
		}).Error("database: failed to get specified user source link")
		return nil, err
	}

	for _, userSource := range userSources {
		var source models.Source
		err = db.WithContext(ctx).Model(&models.Source{}).Where("id = ?", userSource.SourceID).First(&source).Error
		if err != nil {
			log.WithFields(log.Fields{
				"source_id": userSource.SourceID,
			}).Error("database: failed to get source")
			return nil, err
		}

		userSourceMap[source.DisplayName] = graphModels.AnthroveUserRelationship{
			UserID:   userSource.AccountID,
			Username: userSource.AccountUsername,
			Source: graphModels.AnthroveSource{
				DisplayName: source.DisplayName,
				Domain:      source.Domain,
				Icon:        source.Icon,
			},
		}
	}

	log.WithFields(log.Fields{
		"anthrove_user_id":    anthroveUserID,
		"source_display_name": sourceDisplayName,
	}).Trace("database: got specified user source link")

	return userSourceMap, nil
}

func GetAnthroveUser(ctx context.Context, db *gorm.DB, anthroveUserID models.AnthroveUserID) (*graphModels.AnthroveUser, error) {

	if anthroveUserID == "" {
		return nil, fmt.Errorf("anthroveUserID cannot be empty")
	}

	var user models.User
	var userSources []models.UserSource
	anthroveUser := &graphModels.AnthroveUser{
		UserID: anthroveUserID,
	}

	err := db.WithContext(ctx).First(&user, "id = ?", string(anthroveUserID)).Error
	if err != nil {
		log.WithFields(log.Fields{
			"anthrove_user_id": anthroveUserID,
		}).Error("database: failed to get user")
		return nil, err
	}

	err = db.WithContext(ctx).Model(&models.UserSource{}).Where("user_id = ?", string(anthroveUserID)).Find(&userSources).Error
	if err != nil {
		log.WithFields(log.Fields{
			"anthrove_user_id": anthroveUserID,
		}).Error("database: failed to get user sources")
		return nil, err
	}

	for _, userSource := range userSources {
		var source models.Source
		err = db.WithContext(ctx).Model(&models.Source{}).Where("id = ?", userSource.SourceID).First(&source).Error
		if err != nil {
			log.WithFields(log.Fields{
				"source_id": userSource.SourceID,
			}).Error("database: failed to get source")
			return nil, err
		}

		anthroveUser.Relationship = append(anthroveUser.Relationship, graphModels.AnthroveUserRelationship{
			UserID:   userSource.AccountID,
			Username: userSource.AccountUsername,
			Source: graphModels.AnthroveSource{
				DisplayName: source.DisplayName,
				Domain:      source.Domain,
				Icon:        source.Icon,
			},
		})
	}

	log.WithFields(log.Fields{
		"anthrove_user_id": anthroveUserID,
	}).Trace("database: got anthrove user")

	return anthroveUser, nil
}

func GetAllAnthroveUserIDs(ctx context.Context, db *gorm.DB) ([]models.AnthroveUserID, error) {
	var users []models.User
	var userIDs []models.AnthroveUserID

	err := db.WithContext(ctx).Model(&models.User{}).Find(&users).Error
	if err != nil {
		log.Error("database: failed to get all anthrove user IDs")
		return nil, err
	}

	for _, user := range users {
		userIDs = append(userIDs, models.AnthroveUserID(user.ID))
	}

	log.WithFields(log.Fields{
		"anthrove_user_id_count": len(userIDs),
	}).Trace("database: got all anthrove user IDs")

	return userIDs, nil
}

func GetUserFavoriteNodeWithPagination(ctx context.Context, db *gorm.DB, anthroveUserID models.AnthroveUserID, skip int, limit int) (*graphModels.FavoriteList, error) {
	var userFavorites []models.UserFavorite
	var favoritePosts []graphModels.FavoritePost

	err := db.WithContext(ctx).Model(&models.UserFavorite{}).Where("user_id = ?", string(anthroveUserID)).Offset(skip).Limit(limit).Find(&userFavorites).Error
	if err != nil {
		log.WithFields(log.Fields{
			"anthrove_user_id": anthroveUserID,
			"skip":             skip,
			"limit":            limit,
		}).Error("database: failed to get user favorites with pagination")
		return nil, err
	}

	for _, userFavorite := range userFavorites {
		var post models.Post
		err = db.WithContext(ctx).Model(&models.Post{}).Where("id = ?", userFavorite.PostID).First(&post).Error
		if err != nil {
			log.WithFields(log.Fields{
				"post_id": userFavorite.PostID,
			}).Error("database: failed to get post")
			return nil, err
		}

		favoritePosts = append(favoritePosts, graphModels.FavoritePost{
			AnthrovePost: graphModels.AnthrovePost{
				PostID: models.AnthrovePostID(post.ID),
				Rating: post.Rating,
			},
		})
	}

	log.WithFields(log.Fields{
		"anthrove_user_id":        anthroveUserID,
		"anthrove_user_fav_count": len(favoritePosts),
	}).Trace("database: got all anthrove user favorites")

	return &graphModels.FavoriteList{Posts: favoritePosts}, nil
}

func GetUserTagNodeWitRelationToFavedPosts(ctx context.Context, db *gorm.DB, anthroveUserID models.AnthroveUserID) ([]graphModels.TagsWithFrequency, error) {
	var userFavorites []models.UserFavorite
	err := db.WithContext(ctx).Where("user_id = ?", string(anthroveUserID)).Find(&userFavorites).Error
	if err != nil {
		log.WithFields(log.Fields{
			"anthrove_user_id": anthroveUserID,
		}).Error("database: failed to get user favorites")
		return nil, err
	}

	tagFrequency := make(map[struct {
		name     string
		typeName string
	}]int)
	for _, userFavorite := range userFavorites {
		var post models.Post
		err = db.WithContext(ctx).Preload("Tags").First(&post, "id = ?", userFavorite.PostID).Error
		if err != nil {
			log.WithFields(log.Fields{
				"post_id": userFavorite.PostID,
			}).Error("database: failed to get post tags")
			return nil, err
		}

		for _, tag := range post.Tags {
			tagFrequency[struct {
				name     string
				typeName string
			}{name: tag.Name, typeName: string(tag.Type)}]++
		}
	}

	var tagsWithFrequency []graphModels.TagsWithFrequency
	for data, frequency := range tagFrequency {
		tagsWithFrequency = append(tagsWithFrequency, graphModels.TagsWithFrequency{
			Frequency: int64(frequency),
			Tags: graphModels.AnthroveTag{
				Name: data.name,
				Type: data.typeName,
			},
		})
	}

	log.WithFields(log.Fields{
		"anthrove_user_id": anthroveUserID,
		"tag_amount":       len(tagsWithFrequency),
	}).Trace("database: got user tag node with relation to faved posts")

	return tagsWithFrequency, nil
}