package main

import (
	"crypto/sha256"
	"encoding/hex"
	"encoding/json"
	"io/fs"
	"os"
	"path"
	"path/filepath"
	"strings"

	"github.com/BatteredBunny/rjson"
	ffmpeg "github.com/u2takey/ffmpeg-go"
)

func listFilesRecursively(findPath string, hide_hidden bool) (filelist []string, err error) {
	err = filepath.Walk(findPath, func(currentPath string, info fs.FileInfo, err error) error {
		if err != nil {
			return err
		}

		if !info.IsDir() {
			if hide_hidden && strings.HasPrefix(path.Base(currentPath), ".") {
				return nil
			}

			filelist = append(filelist, currentPath)
		}
		return nil
	})

	return
}

func RecreateDir(dir string) (err error) {
	if err = os.RemoveAll(dir); err != nil {
		return
	}

	os.MkdirAll(dir, 0700)
	return
}

type StreamInfo struct {
	Index       int                   `json:"index"`
	CodecName   string                `json:"codec_name"`
	CodecType   string                `json:"codec_type"`
	Disposition StreamInfoDisposition `json:"disposition"`
	Tags        StreamInfoTags        `json:"tags"`
}

type StreamInfoDisposition struct {
	HearingImpaired int `json:"hearing_impaired"`
}

type StreamInfoTags struct {
	Language string `json:"language"`
}

func SelectPreferredSubtitle(filename string) (*int, error) {
	rawMetadata, err := ffmpeg.Probe(filename)
	if err != nil {
		return nil, err
	}

	metadata, err := rjson.QueryJson([]byte(rawMetadata), `.streams.[]`)
	if err != nil {
		return nil, err
	}

	var streams []StreamInfo
	if err = json.Unmarshal(metadata, &streams); err != nil {
		return nil, err
	}

	var numberOfSubStreams int
	for _, stream := range streams {
		if stream.CodecType == "subtitle" {
			numberOfSubStreams += 1
		}
	}

	streamNumberModifier := len(streams) - numberOfSubStreams

	var bestSubtitle StreamInfo
	var foundSubtitle bool
	for _, stream := range streams {
		// Skips dvd_subtitle or picture based subtitles as i dont know how to hardcode them
		if stream.CodecType != "subtitle" || stream.CodecName == "dvd_subtitle" || stream.Tags.Language != "eng" {
			continue
		}

		if bestSubtitle.Disposition.HearingImpaired == 0 && stream.Disposition.HearingImpaired == 1 {
			bestSubtitle = stream
			foundSubtitle = true
		} else if bestSubtitle.Disposition.HearingImpaired == 1 && stream.Disposition.HearingImpaired == 0 {
			// Skips if bestSubtitle is HearingImpaired and current one isnt
			continue
		} else {
			bestSubtitle = stream
			foundSubtitle = true
		}
	}

	if foundSubtitle {
		actualStreamIndex := bestSubtitle.Index - streamNumberModifier

		return &actualStreamIndex, nil
	} else {
		return nil, nil
	}
}

func ToColor(s string) (color string) {
	hasher := sha256.New()
	hasher.Write([]byte(s))

	color = hex.EncodeToString(hasher.Sum(nil))
	color = color[0:6]

	return
}