package domain

import "os/exec"

// MediaType represents the type of media the user wants to download.
type MediaType int

const (
	MediaTypeAudio MediaType = iota + 1
	MediaTypeVideo
	MediaTypeVideoAudio
)

func (m MediaType) String() string {
	switch m {
	case MediaTypeAudio:
		return "audio"
	case MediaTypeVideo:
		return "video"
	case MediaTypeVideoAudio:
		return "video_audio"
	default:
		return "unknown"
	}
}

// Format represents a downloadable format from yt-dlp.
type Format struct {
	ID          string
	Extension   string
	Width       int
	Height      int
	Resolution  string
	Filesize    int64
	Codec       string
	Bitrate     string
	Language    string
	IsAudioOnly bool
	IsVideoOnly bool
	HasAudio    bool
	HasVideo    bool
}

// MediaInfo holds the full information about a downloadable media item.
type MediaInfo struct {
	URL           string
	Title         string
	Uploader      string
	Thumbnail     string
	Duration      float64
	Formats       []Format
	Languages     []string
	EstimatedSize int64
}

// IsAudioOnlyContent returns true when no format carries a video stream.
func (m *MediaInfo) IsAudioOnlyContent() bool {
	for _, f := range m.Formats {
		if f.HasVideo {
			return false
		}
	}
	return len(m.Formats) > 0
}

// PlaylistEntry represents a single entry in a playlist.
type PlaylistEntry struct {
	ID       string
	Title    string
	URL      string
	Duration float64
}

// DownloadStatus represents the current state of a download job.
type DownloadStatus int

const (
	StatusPending DownloadStatus = iota
	StatusFetching
	StatusDownloading
	StatusProcessing
	StatusCompleted
	StatusFailed
	StatusCancelled
)

func (s DownloadStatus) String() string {
	switch s {
	case StatusPending:
		return "Pending"
	case StatusFetching:
		return "Fetching info"
	case StatusDownloading:
		return "Downloading"
	case StatusProcessing:
		return "Processing"
	case StatusCompleted:
		return "Completed"
	case StatusFailed:
		return "Failed"
	case StatusCancelled:
		return "Cancelled"
	default:
		return "Unknown"
	}
}

// DownloadJob represents an active download process for a user.
type DownloadJob struct {
	ID             string
	UserID         int64
	ChatID         int64
	MessageID      int
	URL            string
	MediaType      MediaType
	SelectedFormat *Format
	FormatString   string
	Language       string
	Status         DownloadStatus
	Progress       float64
	Speed          string
	ETA            string
	FileSize       int64
	MaxFileSize    int64
	FilePath       string
	Title          string
	ProgressPrefix string
	QuotaApplied   bool
	StderrLog      string
	Done           chan struct{}
	CancelCh       chan struct{}
	Cmd            *exec.Cmd
}

// UserPreferences holds per-user default preferences.
type UserPreferences struct {
	DefaultMediaType      MediaType
	DefaultAudioFormat    string
	DefaultVideoFormat    string
	DefaultAudioContainer string
	DefaultVideoContainer string
	DefaultLanguage       string
}

// UserQuotas holds the quota usage and limits for a user.
type UserQuotas struct {
	DailyLimitMB   int64
	DailyUsedMB    int64
	DailyDate      string
	WeeklyLimitMB  int64
	WeeklyUsedMB   int64
	WeekStart      string
	MonthlyLimitMB int64
	MonthlyUsedMB  int64
	MonthStart     string
}

// DownloadRecord is a completed download entry stored in history.
type DownloadRecord struct {
	ID        int64
	UserID    int64
	URL       string
	Title     string
	MediaType string
	FormatID  string
	Container string
	FileSize  int64
	Status    string
	CreatedAt string
}

// SearchState tracks the user's current search results flow.
type SearchState struct {
	Query   string
	Entries []PlaylistEntry
	Page    int
	PerPage int
	Source  string // "youtube" or "ytmusic"
}