package json_io

import (
	"encoding/json"
	"fmt"
	"os"

	"git.tswf.io/incredible-go/incredible-go-core/pkg/io/files"
)

func ReadFromJsonBytes[T any](jsonBytes []byte) (*T, error) {
	var result T

	err := json.Unmarshal(jsonBytes, &result)

	if err != nil {
		return nil, err
	}

	return &result, nil
}

func WriteToJsonBytes[T any](value *T) ([]byte, error) {
	content, err := json.Marshal(value)

	if err != nil {
		return nil, err
	}

	return content, nil
}

func ReadFromJsonString[T any](jsonString string) (*T, error) {
	return ReadFromJsonBytes[T]([]byte(jsonString))
}

func WriteToJsonString[T any](value *T) (string, error) {
	jsonBytes, err := WriteToJsonBytes(value)
	if err != nil {
		return "", err
	}

	return string(jsonBytes), nil
}

func ReadFromJsonFile[T any](jsonFileLocation string) (*T, error) {
	fileInfo, err := os.Stat(jsonFileLocation)
	if err != nil {
		return nil, err
	}

	if fileInfo.IsDir() {
		return nil, fmt.Errorf("json file '%s' can not be a directory", jsonFileLocation)
	}

	jsonFileContentBytes, err := os.ReadFile(jsonFileLocation)

	if err != nil {
		return nil, err
	}

	return ReadFromJsonBytes[T](jsonFileContentBytes)
}

func WriteToJsonFile[T any](jsonFileLocation string, value *T) ([]byte, error) {
	jsonBytes, err := WriteToJsonBytes(value)

	if err != nil {
		return nil, err
	}

	file, err := files.OpenFileForWriting(jsonFileLocation)

	if err != nil {
		return nil, err
	}

	_, err = file.Write(jsonBytes)

	if err != nil {
		return nil, err
	}

	return jsonBytes, nil
}