package yaml

import (
	"bytes"
	"errors"
	"fmt"
	"gopkg.in/yaml.v3"
	"io"
	"os"
	"reflect"
)

func LoadYamlFile(yamlFilePath string, retObjects *[]any) error {
	yamlFile, err := os.Open(yamlFilePath)
	if err != nil {
		return err
	}

	defer func(yamlFile *os.File) {
		err := yamlFile.Close()
		if err != nil {
			fmt.Println(err)
		}
	}(yamlFile)

	return loadYaml(yamlFile, retObjects)
}

func LoadYamlBytes(yamlBytes []byte, retObjects *[]any) error {
	return loadYaml(bytes.NewReader(yamlBytes), retObjects)
}

func loadYaml(r io.Reader, retObjects *[]any) error {
	decoder := yaml.NewDecoder(r)

	for i := 0; i < len(*retObjects); i++ {
		retObject := (*retObjects)[i]

		retObjectType := reflect.TypeOf(retObject)

		if retObjectType.Kind() != reflect.Ptr || retObjectType.Kind() != reflect.Map {
			return errors.New("返回对象slice元素需要指针")
		}

		err := decoder.Decode(retObject)
		if err != nil {
			if err == io.EOF {
				break
			}

			return err
		}
	}

	return nil
}