package metadata

import (
	"errors"
	"fmt"
)

type AudioMetadata struct {
	FileName string `json:"filename"`
	Duration int    `json:"duration"`
}

type MetadataMemoryStorage struct {
	Metadata map[string]AudioMetadata
}

func NewMetadataMemoryStorage() *MetadataMemoryStorage {
	return &MetadataMemoryStorage{Metadata: map[string]AudioMetadata{}}
}

func (metadata *MetadataMemoryStorage) Put(a AudioMetadata) (err error) {
	fmt.Println(metadata, a)
	_, ok := metadata.Metadata[a.FileName]
	if !ok {
		metadata.Metadata[a.FileName] = a
		return nil
	}
	return errors.New("already exists") // 409 Conflict
}

func (metadata *MetadataMemoryStorage) get(filename string) (a AudioMetadata, err error) {
	val, ok := metadata.Metadata[filename]
	if ok {
		return val, nil
	}
	return AudioMetadata{}, errors.New("not found") // 404 Not Found
}

func (metadata *MetadataMemoryStorage) filterMaxDuration(maxDuration int) (a []string) {
	result := []string{}
	for _, item := range metadata.Metadata {
		if (item.Duration <= maxDuration) || (maxDuration <= 0) {
			result = append(result, item.FileName)
		}
	}
	return result
}