// Copyright (C) 2024 Mya Pitzeruse
// SPDX-License-Identifier: MIT

package crud

import (
	"context"

	"gorm.io/gorm"
)

// GetFunc defines the signature of the function returned by Getter. It streamlines the process of reading single
// records from the database.
type GetFunc[T any] func(ctx context.Context, filters ...map[string]interface{}) (*T, error)

// Getter returns a function that can read data from a gorm database.
func Getter[T any](db *gorm.DB) GetFunc[T] {
	prototype := new(T)

	return func(ctx context.Context, filters ...map[string]interface{}) (*T, error) {
		q := Transaction(ctx, db).
			Model(prototype)

		for _, filter := range filters {
			q = q.Where(filter)
		}

		body := new(T)

		err := q.First(body).Error
		if err != nil {
			return nil, err
		}

		return body, nil
	}
}