package handlers

import (
	"encoding/json"
	"fmt"

	"bookhoard/internal/database"
)

// MediaDetail embeds database.MediaItems for complete book metadata
// No field duplication - template gets direct access to all database fields
type MediaDetail struct {
	database.MediaItems // Embedded - ALL book fields available

	// Audio editorial/tech surfaces (A2a): duration parsed out of the
	// audio_metadata JSONB the scanner wrote (display-only).
	audioDurationSeconds float64
	audioParsed          bool

	// Absolute on-disk location (library folder + relative path), resolved by
	// the page handler so the UI can show where the file lives.
	FileLocation string `json:"file_location"`

	// User-specific data
	Rating          *database.MediaRatings    `json:"rating,omitempty"`
	Review          *database.MediaReviews    `json:"review,omitempty"` // raw markdown
	Collections     []database.Collections    `json:"collections"`
	ReadingProgress *database.ReadingProgress `json:"reading_progress,omitempty"`

	// The viewer's own reading-history card for this book (nil when the
	// user has no sessions here); rendered as the "Your Reading Stats"
	// section of the book page.
	BookStats *BookStatsData `json:"book_stats,omitempty"`

	// Conflict data (if exists)
	ActiveConflict *ConflictDetailResponse `json:"active_conflict,omitempty"`

	// Computed counts
	NotesCount      int `json:"notes_count"`
	HighlightsCount int `json:"highlights_count"`

	// Deleted-annotation history (tombstoned rows, newest first) — the book
	// page's "recently deleted" list with restore/permanent-delete actions.
	DeletedAnnotations []DeletedAnnotationResponse `json:"deleted_annotations"`
}

// BookStatsData is the per-book reading-stats card payload.
type BookStatsData struct {
	TotalMinutes int
	TotalSeconds int // exact wall-clock; audio "Time listened" displays from this
	TotalPages   int
	SessionCount int
	MaxProgress  float64 // 0..1
	Finished     bool
	LastSession  string
	FirstSession string
}

// IsAudio reports whether the item's format group is the dedicated
// audiobook group (drives every "reading vs listening" wording swap).
func (md *MediaDetail) IsAudio() bool {
	return md.FormatGroup == "audiobook"
}

// --- audio-aware copy helpers (A2c): one home per verb so web + future
// clients agree; format_group chooses the string ---

func (md *MediaDetail) ActionLabel() string {
	if md.IsAudio() {
		return "Listen Now"
	}
	return "Read Now"
}

func (md *MediaDetail) ActionIcon() string {
	if md.IsAudio() {
		return "headphones"
	}
	return "book-open"
}

func (md *MediaDetail) MarkCompleteLabel() string {
	if md.IsAudio() {
		return "Mark Complete"
	}
	return "Mark Read"
}

func (md *MediaDetail) MarkResetLabel() string {
	if md.IsAudio() {
		return "Mark Not Complete"
	}
	return "Mark Unread"
}

func (md *MediaDetail) ProgressHeader() string {
	if md.IsAudio() {
		return "Listening Progress"
	}
	return "Reading Progress"
}

func (md *MediaDetail) LastReadLabel() string {
	if md.IsAudio() {
		return "Last Listen"
	}
	return "Last Read"
}

func (md *MediaDetail) StatsHeader() string {
	if md.IsAudio() {
		return "Your Listening Stats"
	}
	return "Your Reading Stats"
}

func (md *MediaDetail) TimeStatLabel() string {
	if md.IsAudio() {
		return "Time Listening"
	}
	return "Time Reading"
}

// AudioDuration lazily parses duration_seconds out of audio_metadata.
func (md *MediaDetail) AudioDuration() float64 {
	if !md.audioParsed {
		md.audioParsed = true
		var payload struct {
			DurationSeconds float64 `json:"duration_seconds"`
		}
		if len(md.AudioMetadata) > 0 && json.Unmarshal(md.AudioMetadata, &payload) == nil {
			md.audioDurationSeconds = payload.DurationSeconds
		}
	}
	return md.audioDurationSeconds
}

// AudioDurationLabel renders H:MM:SS (or M:SS under an hour) for the
// audio surfaces — same shape the web player shows.
func (md *MediaDetail) AudioDurationLabel() string {
	s := int(md.AudioDuration() + 0.5)
	if s <= 0 {
		return "—"
	}
	h := s / 3600
	m := (s % 3600) / 60
	sec := s % 60
	if h > 0 {
		return fmt.Sprintf("%d:%02d:%02d", h, m, sec)
	}
	return fmt.Sprintf("%d:%02d", m, sec)
}

// AudioCurrentSeconds is the playhead in seconds: percentage of the
// whole-book duration (chapter-exact granularity lives in the player;
// the detail page shows shelf-level position).
func (md *MediaDetail) AudioCurrentSeconds() int {
	dur := md.AudioDuration()
	if dur <= 0 || md.ReadingProgress == nil || !md.ReadingProgress.Percentage.Valid {
		return 0
	}
	return int(md.ReadingProgress.Percentage.Float64*dur + 0.5)
}

// AudioCurrentLabel is the playhead rendered H:MM:SS.
func (md *MediaDetail) AudioCurrentLabel() string {
	s := md.AudioCurrentSeconds()
	if s <= 0 {
		return "0:00"
	}
	h := s / 3600
	m := (s % 3600) / 60
	sec := s % 60
	if h > 0 {
		return fmt.Sprintf("%d:%02d:%02d", h, m, sec)
	}
	return fmt.Sprintf("%d:%02d", m, sec)
}

// AudioStatsLabel is "Time listened" for audio items (H:MM:SS), honoring
// the plan's swap of the Pages Synced tile.
func (md *MediaDetail) TimeListenedLabel() string {
	s := 0
	if md.BookStats != nil {
		s = md.BookStats.TotalSeconds
	}
	h := s / 3600
	m := (s % 3600) / 60
	sec := s % 60
	if h > 0 {
		return fmt.Sprintf("%d:%02d:%02d", h, m, sec)
	}
	return fmt.Sprintf("%d:%02d", m, sec)
}