package main

import (
	"os"
	"path/filepath"

	"git.milar.in/milarin/slices"
)

type Playlist struct {
	Name  string   `json:"name"`
	Songs []string `json:"songs"`
}

func GetAll() ([]Playlist, error) {
	playlistNames, err := GetPlaylists()
	if err != nil {
		return nil, err
	}

	playlists := make([]Playlist, 0, len(playlistNames))
	for _, playlistName := range playlistNames {
		songs, err := GetSongs(playlistName)
		if err != nil {
			return nil, err
		}

		playlists = append(playlists, Playlist{
			Name:  playlistName,
			Songs: songs,
		})
	}

	return playlists, nil
}

func GetPlaylists() ([]string, error) {
	entries, err := os.ReadDir(LibraryPath)
	if err != nil {
		return nil, err
	}

	directories := slices.Filter(entries, And(IsDir, Not(IsHidden)))
	return slices.Map(directories, FsEntry2Name), nil
}

func GetSongs(playlist string) ([]string, error) {
	entries, err := os.ReadDir(filepath.Join(LibraryPath, playlist))
	if err != nil {
		return nil, err
	}

	directories := slices.Filter(entries, Not(IsDir))
	return slices.Map(directories, FsEntry2Name), nil
}