package postgres

import (
	"context"
	"errors"

	otterError "git.dragse.it/anthrove/otter-space-sdk/pkg/error"
	"git.dragse.it/anthrove/otter-space-sdk/pkg/models"
	log "github.com/sirupsen/logrus"
	"gorm.io/gorm"
)

func CreateReferenceBetweenPostAndSource(ctx context.Context, db *gorm.DB, anthrovePostID models.AnthrovePostID, sourceDomain models.AnthroveSourceDomain) error {
	var source models.Source

	if anthrovePostID == "" {
		return &otterError.EntityValidationFailed{Reason: otterError.AnthroveUserIDIsEmpty}
	}

	if len(anthrovePostID) != 25 {
		return &otterError.EntityValidationFailed{Reason: otterError.AnthroveUserIDToShort}
	}

	if sourceDomain == "" {
		return &otterError.EntityValidationFailed{Reason: "sourceDomain cannot be empty"}
	}

	// Find the source
	result := db.WithContext(ctx).Where("domain = ?", sourceDomain).First(&source)
	if result.Error != nil {
		if errors.Is(result.Error, gorm.ErrRecordNotFound) {
			return &otterError.NoDataFound{}
		}
		return result.Error
	}

	// Establish the relationship
	result = db.WithContext(ctx).Create(models.PostReference{
		PostID:   string(anthrovePostID),
		SourceID: string(source.ID),
		URL:      string(sourceDomain),
	})

	if result.Error != nil {
		if errors.Is(result.Error, gorm.ErrDuplicatedKey) {
			return &otterError.EntityAlreadyExists{}
		}
		return result.Error
	}

	if result.RowsAffected == 0 {
		return &otterError.NoDataWritten{}
	}

	log.WithFields(log.Fields{
		"anthrove_post_id":       anthrovePostID,
		"anthrove_source_domain": sourceDomain,
	}).Trace("database: created anthrove post to source link")

	return nil
}

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

	if anthrovePostID == "" {
		return &otterError.EntityValidationFailed{Reason: otterError.AnthroveUserIDIsEmpty}
	}

	if len(anthrovePostID) != 25 {
		return &otterError.EntityValidationFailed{Reason: otterError.AnthroveUserIDToShort}
	}

	if anthroveUserID == "" {
		return &otterError.EntityValidationFailed{Reason: "anthroveUserID cannot be empty"}
	}

	userFavorite := models.UserFavorites{
		UserID: string(anthroveUserID),
		PostID: string(anthrovePostID),
	}

	result := db.WithContext(ctx).Create(&userFavorite)
	if result.Error != nil {
		if errors.Is(result.Error, gorm.ErrDuplicatedKey) {
			return &otterError.EntityAlreadyExists{}
		}
		return result.Error
	}

	if result.RowsAffected == 0 {
		return &otterError.NoDataWritten{}
	}

	log.WithFields(log.Fields{
		"anthrove_user_id": anthroveUserID,
		"anthrove_post_id": anthrovePostID,
	}).Trace("database: created user to post link")

	return nil
}

func CheckReferenceBetweenUserAndPost(ctx context.Context, db *gorm.DB, anthroveUserID models.AnthroveUserID, anthrovePostID models.AnthrovePostID) (bool, error) {
	var count int64

	if anthrovePostID == "" {
		return false, &otterError.EntityValidationFailed{Reason: otterError.AnthroveUserIDIsEmpty}
	}

	if len(anthrovePostID) != 25 {
		return false, &otterError.EntityValidationFailed{Reason: otterError.AnthroveUserIDToShort}
	}

	if anthroveUserID == "" {
		return false, &otterError.EntityValidationFailed{Reason: "anthroveUserID cannot be empty"}
	}

	if len(anthroveUserID) != 25 {
		return false, &otterError.EntityValidationFailed{Reason: "anthroveUserID needs to be 25 characters long"}
	}

	result := db.WithContext(ctx).Model(&models.UserFavorites{}).Where("user_id = ? AND post_id = ?", string(anthroveUserID), string(anthrovePostID)).Count(&count)
	if result.Error != nil {
		if errors.Is(result.Error, gorm.ErrRecordNotFound) {
			return false, &otterError.NoDataFound{}
		}
		return false, result.Error
	}

	exists := count > 0

	log.WithFields(log.Fields{
		"relationship_exists":           exists,
		"relationship_anthrove_user_id": anthroveUserID,
		"relationship_anthrove_post_id": anthrovePostID,
	}).Trace("database: checked user post relationship")

	return exists, nil
}