package internal

import (
	"context"
	"fmt"

	"git.dragse.it/anthrove/anthrove-graph-sdk.git/pkg/models"
	"github.com/neo4j/neo4j-go-driver/v5/neo4j"
	log "github.com/sirupsen/logrus"
)

func CreateUserNodeWithSourceRelation(ctx context.Context, driver neo4j.DriverWithContext, anthroveUserID models.AnthroveUserID, sourceDomain string, userID string, username string) (*models.AnthroveUser, error) {
	query := `
		MATCH (userNode:User {user_id: $anthrove_user_id})
		MATCH (sourceNode:Source {domain: $source_domain})
		MERGE (userNode)-[r:HAS_ACCOUNT_AT {username: $source_user_name, user_id: $source_user_id}]->(sourceNode)
	`
	params := map[string]any{
		"anthrove_user_id": anthroveUserID,
		"source_user_id":   userID,
		"source_user_name": username,
		"source_domain":    sourceDomain,
	}

	_, err := neo4j.ExecuteQuery(ctx, driver, query, params, neo4j.EagerResultTransformer)
	if err != nil {
		return nil, err
	}

	var anthroveUserRelationship []models.AnthroveUserRelationship

	anthroveUserRelationship = append(anthroveUserRelationship, models.AnthroveUserRelationship{
		UserID:             userID,
		Username:           username,
		ScrapeTimeInterval: "",
		Source: models.AnthroveSource{
			DisplayName: "",
			Domain:      sourceDomain,
			Icon:        "",
		},
	})

	anthroveUser := models.AnthroveUser{
		UserID:       anthroveUserID,
		Relationship: anthroveUserRelationship,
	}

	log.WithFields(log.Fields{
		"anthrove_user_id": anthroveUserID,
		"source_user_id":   userID,
		"source_user_name": username,
		"source_domain":    sourceDomain,
	}).Trace("graph: crated user with relationship")

	return &anthroveUser, nil
}

func GetUserFavoritesCount(ctx context.Context, driver neo4j.DriverWithContext, anthroveUserID models.AnthroveUserID) (int64, error) {
	var userFavoriteCount int64

	query := `
		MATCH (userNode:User {user_id: anthrove_user_id})
		MATCH (userNode)-[:FAV]->(favPost:AnthrovePost)
		MATCH (sourceNode)-[:REFERENCE]->(favPost)
		RETURN count(favPost) AS FavoritePostsCount
	`

	params := map[string]any{
		"anthrove_user_id": anthroveUserID,
	}

	result, err := neo4j.ExecuteQuery(ctx, driver, query, params, neo4j.EagerResultTransformer)
	if err != nil {
		return 0, err
	}

	if len(result.Records) == 0 {
		// no matches -> user does not exist, return count 0
		return userFavoriteCount, err
	}

	record := result.Records[0]

	userFavoriteCount, _, err = neo4j.GetRecordValue[int64](record, "FavoritePostsCount")
	if err != nil {
		return userFavoriteCount, err
	}

	log.WithFields(log.Fields{
		"anthrove_user_id":        anthroveUserID,
		"anthrove_user_fav_count": userFavoriteCount,
	}).Trace("graph: get user favorite count")

	return userFavoriteCount, nil
}

func GetUserSourceLink(ctx context.Context, driver neo4j.DriverWithContext, anthroveUserID models.AnthroveUserID) (map[string]models.AnthroveUserRelationship, error) {

	userSource := make(map[string]models.AnthroveUserRelationship)

	query := `
		MATCH (user:User{user_id: anthrove_user_id})-[r:HAS_ACCOUNT_AT]->(s:Source)
		RETURN toString(r.user_id) AS sourceUserID, toString(r.username) AS sourceUsername, s.display_name as sourceDisplayName;
	`
	params := map[string]any{
		"anthrove_user_id": anthroveUserID,
	}

	result, err := neo4j.ExecuteQuery(ctx, driver, query, params, neo4j.EagerResultTransformer)
	if err != nil {
		return nil, err
	}

	if len(result.Records) == 0 {
		return nil, fmt.Errorf("user has no relations")
	}

	for i := range result.Records {
		record := result.Records[i]
		sourceName, _, err := neo4j.GetRecordValue[string](record, "sourceDisplayName")
		if err != nil {
			return nil, err
		}
		sourceUserID, _, err := neo4j.GetRecordValue[string](record, "sourceUserID")
		if err != nil {
			return nil, err
		}
		sourceUsername, _, err := neo4j.GetRecordValue[string](record, "sourceUsername")
		if err != nil {
			return nil, err
		}

		anthroveSourceUser := models.AnthroveUserRelationship{
			UserID:   sourceUserID,
			Username: sourceUsername,
		}
		userSource[sourceName] = anthroveSourceUser
	}

	log.WithFields(log.Fields{
		"anthrove_user_id": anthroveUserID,
		"anthrove_data":    userSource,
	}).Trace("graph: get user favorite count")

	return userSource, nil
}