package postgres

import (
	"context"
	"errors"

	otterError "git.dragse.it/anthrove/otter-space-sdk/v2/pkg/error"

	"git.dragse.it/anthrove/otter-space-sdk/v2/pkg/models"
	log "github.com/sirupsen/logrus"
	"gorm.io/gorm"
)

func CreatePost(ctx context.Context, db *gorm.DB, anthrovePost *models.Post) error {

	if anthrovePost == nil {
		return &otterError.EntityValidationFailed{Reason: "anthrovePost is nil"}
	}

	result := db.WithContext(ctx).Create(&anthrovePost)
	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":     anthrovePost.ID,
		"anthrove_post_rating": anthrovePost.Rating,
	}).Trace("database: created anthrove post")

	return nil
}

// TODO: Make Tests
func CreatePostInBatch(ctx context.Context, db *gorm.DB, anthrovePost []models.Post, batchSize int) error {
	if anthrovePost == nil {
		return &otterError.EntityValidationFailed{Reason: "anthrovePost cannot be nil"}
	}

	if len(anthrovePost) == 0 {
		return &otterError.EntityValidationFailed{Reason: "anthrovePost cannot be empty"}
	}

	if batchSize == 0 {
		return &otterError.EntityValidationFailed{Reason: "batch size cannot be zero"}
	}

	result := db.WithContext(ctx).CreateInBatches(anthrovePost, batchSize)
	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{
		"tag_size":   len(anthrovePost),
		"batch_size": batchSize,
	}).Trace("database: created tag node")

	return nil
}

func GetPostByAnthroveID(ctx context.Context, db *gorm.DB, anthrovePostID models.AnthrovePostID) (*models.Post, error) {

	if anthrovePostID == "" {
		return nil, &otterError.EntityValidationFailed{Reason: "anthrovePostID is not set"}
	}

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

	var post models.Post
	result := db.WithContext(ctx).First(&post, "id = ?", anthrovePostID)
	if result.Error != nil {
		if errors.Is(result.Error, gorm.ErrRecordNotFound) {
			return nil, &otterError.NoDataFound{}
		}
		return nil, result.Error
	}

	return &post, nil
}

func GetPostBySourceURL(ctx context.Context, db *gorm.DB, sourceURL string) (*models.Post, error) {

	if sourceURL == "" {
		return nil, &otterError.EntityValidationFailed{Reason: "sourceURL is not set"}
	}

	var post models.Post
	result := db.WithContext(ctx).Raw(`SELECT p.id AS id, p.rating as rating FROM "Post" AS p INNER JOIN "PostReference" AS pr ON p.id = pr.post_id AND pr.url = $1 LIMIT 1`, sourceURL).First(&post)

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

	return &post, nil
}

func GetPostBySourceID(ctx context.Context, db *gorm.DB, sourceID models.AnthroveSourceID) (*models.Post, error) {

	if sourceID == "" {
		return nil, &otterError.EntityValidationFailed{Reason: "sourceID is not set"}
	}

	var post models.Post
	result := db.WithContext(ctx).Raw(`SELECT p.id AS id, p.rating as rating FROM "Post" AS p INNER JOIN "PostReference" AS pr ON p.id = pr.post_id AND pr.source_id = $1 LIMIT 1`, sourceID).First(&post)

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

	return &post, nil
}