package disk

import (
	"encoding/json"
	"os"
	"path/filepath"
)

type DiskProfile struct {
	DestFolder     string  `json:"dest_folder"`
	OverwriteMode  string  `json:"overwrite_mode"`
	FileSelectMode string  `json:"file_select_mode"`
	ReserveFreeGB  float64 `json:"reserve_free_gb"`
	AutoCopy       bool    `json:"auto_copy"`
	// ShuffleDepth: -1=выкл, 0=файлы вразнобой, 1+=папки на глубине N от корня /media
	ShuffleDepth int `json:"shuffle_depth"`

	// nil = не транскодировать видео
	Transcode *TranscodeProfile `json:"transcode,omitempty"`
}

type TranscodeProfile struct {
	VideoCodec       string `json:"video_codec"`        // "h264" | "h265" | "mpeg4"
	MaxResolution    string `json:"max_resolution"`     // "480p" | "720p" | "1080p"
	MaxVideoBitrate  string `json:"max_video_bitrate"`  // "1000k" | "2000k" | "" (без лимита)
	MaxFPS           int    `json:"max_fps"`            // 0=без лимита | 24 | 25 | 30
	AudioCodec       string `json:"audio_codec"`        // "aac" | "mp3"
	MaxAudioBitrate  string `json:"max_audio_bitrate"`  // "128k" | "192k" | ""
	MaxAudioChannels int    `json:"max_audio_channels"` // 2=стерео | 6=5.1
	OutputFormat     string `json:"output_format"`      // "mp4" | "mkv" | "avi"
}

const profileFile = "profile.json"

func profilePath(mountPath string) string {
	return filepath.Join(mountPath, MarkerDir, profileFile)
}

func LoadProfile(mountPath string) (*DiskProfile, error) {
	data, err := os.ReadFile(profilePath(mountPath))
	if err != nil {
		return nil, err
	}
	var p DiskProfile
	if err := json.Unmarshal(data, &p); err != nil {
		return nil, err
	}
	return &p, nil
}

func SaveProfile(mountPath string, p *DiskProfile) error {
	data, err := json.MarshalIndent(p, "", "  ")
	if err != nil {
		return err
	}
	path := profilePath(mountPath)
	tmp := path + ".tmp"
	if err := os.WriteFile(tmp, data, 0o644); err != nil {
		return err
	}
	return os.Rename(tmp, path)
}

func DefaultProfile() *DiskProfile {
	return &DiskProfile{
		DestFolder:     "media",
		OverwriteMode:  "skip",
		FileSelectMode: "new",
		ReserveFreeGB:  2.0,
		AutoCopy:       false,
		ShuffleDepth:   -1,
	}
}