import { invoke, Channel } from '@tauri-apps/api/core';

export interface ThumbnailSpritesheet {
  filePath: string;
  startIndex: number;
  count: number;
  thumbWidth: number;
  thumbHeight: number;
  columns: number;
  intervalSeconds: number;
}

export interface WaveformTiers {
  /** ~2,000 peaks — overview for full-duration view */
  tier0: number[];
  /** ~10,000 peaks — moderate zoom */
  tier1: number[];
  /** All extracted peaks — deep zoom */
  tier2: number[];
}

export async function extractKeyframes(filePath: string): Promise<number[]> {
  return invoke<number[]>('extract_keyframes', { filePath });
}

export async function extractWaveformTiers(
  filePath: string,
  duration: number,
  onProgress?: (pct: number) => void
): Promise<WaveformTiers> {
  const channel = new Channel<number>();
  if (onProgress) {
    channel.onmessage = onProgress;
  }
  return invoke<WaveformTiers>('extract_waveform_tiers', {
    filePath,
    duration,
    onProgress: channel,
  });
}

export async function extractThumbnails(
  filePath: string,
  duration: number
): Promise<ThumbnailSpritesheet[]> {
  return invoke<ThumbnailSpritesheet[]>('extract_thumbnails', {
    filePath,
    duration,
  });
}

export async function cleanupThumbnails(paths: string[]): Promise<void> {
  return invoke<void>('cleanup_thumbnails', { paths });
}

export async function checkEmbeddedSubtitles(
  filePath: string
): Promise<string | null> {
  return invoke<string | null>('check_embedded_subtitles', { filePath });
}

export async function listSystemFonts(): Promise<string[]> {
  return invoke<string[]>('list_system_fonts');
}