package main

import (
	"errors"
	"os"
	"path/filepath"
	"strings"

	"git.milar.in/milarin/anilist"
	"git.milar.in/nyaanime/model"
)

type AnimePathPatternData struct {
	Title   anilist.MediaTitle
	Episode int
	Ext     string
}

func GetAnimeEpFilepath(animeEp model.AnimeEpisode, ext string) string {
	tmplData := AnimePathPatternData{
		Title:   animeEp.Anime.Title,
		Episode: animeEp.Episode,
		Ext:     ext,
	}

	b := new(strings.Builder)
	if err := AnimeEpFilepathPattern.Execute(b, tmplData); err != nil {
		panic(err)
	}
	return filepath.Join(AnimePath, b.String())
}

func AnimeEpExistsLocally(animeEp model.AnimeEpisode) bool {
	animeEpPath := GetAnimeEpFilepath(animeEp, "*")

	files, err := filepath.Glob(animeEpPath)
	if err != nil {
		panic(err)
	}

	return len(files) > 0
}

func GetAnimeEpProps(animeEp model.AnimeEpisode) (*FilePriority, bool) {
	animeEpPath := GetAnimeEpFilepath(animeEp, "*")
	files, err := filepath.Glob(animeEpPath)
	if err != nil {
		panic(ErrInvalidGlobSyntax.Wrap(err, animeEpPath))
	}

	var mostPrio *FilePriority

	for _, file := range files {
		props, err := AnalyzeFile(file)
		if err != nil {
			continue
		}

		if !HasFileEssentialProperties(props) {
			continue
		}

		fp := NewFilePriority(props)

		if mostPrio == nil || fp.Priority > mostPrio.Priority {
			mostPrio = fp
		}
	}

	return mostPrio, mostPrio != nil
}

func IsCurrentlyDownloading(animeEp model.AnimeEpisode) bool {
	animeEpPath := GetAnimeEpFilepath(animeEp, "lock")
	_, err := os.Stat(animeEpPath)
	return !errors.Is(err, os.ErrNotExist)
}

func SetCurrentlyDownloading(animeEp model.AnimeEpisode) error {
	animeEpPath := GetAnimeEpFilepath(animeEp, "lock")
	file, err := os.Create(animeEpPath)
	if err != nil {
		defer file.Close()
	}
	return err
}