// File-list glyphs + per-category colors. Category colors
// are fixed tokens (never follow the accent) so a folder is always folder-blue.
// Only the icon glyph is colored; row text stays neutral. Docs and unknown
// files stay muted on purpose — sparing color is what keeps it scannable.
import type { FileEntry } from '@shared/types';

type Category = 'image' | 'audio' | 'video' | 'archive' | 'code' | 'doc';

// Class strings are literals so the Tailwind scanner picks them up.
const MUTED = 'shrink-0 text-muted-foreground';
const FOLDER = 'shrink-0 text-icon-folder';
const LINK = 'shrink-0 text-icon-link';

const CATEGORIES: Record<Category, { glyph: string; class: string; extensions: string[] }> = {
  image: {
    glyph: 'tdesignImage',
    class: 'shrink-0 text-icon-image',
    extensions: 'png jpg jpeg gif webp avif svg ico icns bmp tiff tif heic heif raw'.split(' '),
  },
  audio: {
    glyph: 'tdesignMusic',
    class: 'shrink-0 text-icon-media',
    extensions: 'mp3 wav flac aac ogg oga m4a opus wma aiff aif mid midi'.split(' '),
  },
  video: {
    glyph: 'tdesignVideo',
    class: 'shrink-0 text-icon-media',
    extensions: 'mp4 mkv mov avi webm m4v mpg mpeg wmv flv 3gp'.split(' '),
  },
  archive: {
    glyph: 'tdesignFileZip',
    class: 'shrink-0 text-icon-archive',
    extensions: 'zip tar gz tgz bz2 xz zst 7z rar dmg iso jar deb rpm pkg apk'.split(' '),
  },
  code: {
    glyph: 'tdesignCode',
    class: 'shrink-0 text-icon-code',
    // ".ts" is TypeScript here, not an MPEG transport stream (deliberate)
    extensions: (
      'js mjs cjs ts tsx jsx json jsonc yaml yml toml xml html htm css scss sass less ' +
      'py rb go rs java kt kts swift c h cpp hpp cc m mm cs php sh bash zsh fish ps1 bat ' +
      'sql lua pl r vue svelte astro ini conf cfg env plist gradle cmake nix proto graphql ' +
      'dart ex exs zig lock makefile dockerfile zshrc bashrc bash_profile profile ' +
      'gitignore gitconfig gitattributes editorconfig npmrc nvmrc'
    ).split(' '),
  },
  doc: {
    glyph: 'tdesignFile1',
    class: MUTED, // docs keep the neutral color; only the glyph changes
    extensions: 'md markdown txt rtf pdf doc docx xls xlsx ppt pptx csv tsv log odt ods odp epub'.split(' '),
  },
};

const EXT_CATEGORY = new Map<string, Category>();
for (const category of Object.keys(CATEGORIES) as Category[]) {
  for (const ext of CATEGORIES[category].extensions) EXT_CATEGORY.set(ext, category);
}

/** "a.tar.gz" -> "gz"; ".zshrc" -> "zshrc"; "Makefile" (no dot) -> "makefile". */
function categoryOf(name: string): Category | null {
  const dot = name.lastIndexOf('.');
  const key = (dot >= 0 ? name.slice(dot + 1) : name).toLowerCase();
  return EXT_CATEGORY.get(key) ?? null;
}

const KIND_KEYS: Record<Category, string> = {
  image: 'image',
  audio: 'audio',
  video: 'video',
  archive: 'archive',
  code: 'code',
  doc: 'document',
};

/**
 * i18n key suffix for the optional Kind column (category-based, like the
 * icons); '' for the synthetic '..' row. The caller resolves `kinds.<suffix>`.
 */
export function fileKindKey(entry: FileEntry): string {
  if (entry.name === '..') return '';
  if (entry.type === 'dir') return 'folder';
  if (entry.type === 'symlink') return 'symlink';
  const category = categoryOf(entry.name);
  return category ? KIND_KEYS[category] : 'file';
}

export function fileGlyph(entry: FileEntry): string {
  if (entry.name === '..') return 'tdesignArrowUp';
  if (entry.type === 'dir') return 'tdesignFolder';
  if (entry.type === 'symlink') return 'tdesignLink';
  const category = categoryOf(entry.name);
  return category ? CATEGORIES[category].glyph : 'tdesignFile';
}

export function fileIconClass(entry: FileEntry): string {
  if (entry.name === '..') return MUTED;
  if (entry.type === 'dir') return FOLDER;
  if (entry.type === 'symlink') return LINK;
  const category = categoryOf(entry.name);
  return category ? CATEGORIES[category].class : MUTED;
}