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{ mkdir, readFile, readdir, rename, stat } from \"fs/promises\"\nimport * as path from \"path\"\nimport { runIconsTool } from \"../toolsets/icons\"\n\nclass IconConversionError extends Error {\n constructor(\n message: string,\n readonly errorCode: string\n ) {\n super(message)\n ;(this as NodeJS.ErrnoException).code = errorCode\n }\n}\n\nexport interface IconInfo {\n file: string\n size: number\n}\n\nexport type IconFormat = \"icns\" | \"ico\" | \"set\"\n\nexport interface IconConvertResult {\n icons: IconInfo[]\n isFallback: boolean\n error?: string\n errorCode?: string\n}\n\n// ─── Public API ──────────────────────────────────────────────────────────────\n\ntype IconConversionConfig = {\n sources: string[]\n fallbackSources: string[]\n roots: string[]\n format: IconFormat\n outDir: string\n}\n\nexport async function convertIcon({ sources, fallbackSources, roots, format, outDir }: IconConversionConfig): Promise {\n const candidates = buildSourceCandidates(sources, format)\n\n let icons = await doConvertIcon(candidates, roots, format, outDir)\n\n let isFallback = false\n if (icons == null) {\n const fallbackCandidates = buildSourceCandidates(fallbackSources, format)\n icons = await doConvertIcon(fallbackCandidates, roots, format, outDir)\n isFallback = true\n }\n\n return { icons: icons ?? [], isFallback }\n}\n\n// ─── PNG dimension reader ─────────────────────────────────────────────────────\n// Reads width/height from the PNG IHDR chunk at a fixed offset (no dependencies).\n\nexport async function getPngSize(filePath: string): Promise<{ width: number; height: number }> {\n const buf = await readFile(filePath)\n // PNG signature = 8 bytes, IHDR chunk header = 8 bytes → width at 16, height at 20\n if (buf.length < 24) {\n return { width: 0, height: 0 }\n }\n return { width: buf.readUInt32BE(16), height: buf.readUInt32BE(20) }\n}\n\n// ─── ICO header parser ────────────────────────────────────────────────────────\n\nasync function getIcoMaxSize(filePath: string): Promise {\n const buf = await readFile(filePath)\n if (buf.length < 6 || buf[0] !== 0 || buf[1] !== 0 || buf[2] !== 1 || buf[3] !== 0) {\n return null\n }\n const count = buf.readUInt16LE(4)\n let max = 0\n for (let i = 0; i < count; i++) {\n const off = 6 + i * 16\n if (off + 2 > buf.length) {\n break\n }\n const w = buf[off] || 256\n const h = buf[off + 1] || 256\n if (w > max) {\n max = w\n }\n if (h > max) {\n max = h\n }\n }\n return max\n}\n\n// ─── Set output remapper ──────────────────────────────────────────────────────\n// CLI outputs NxN.png; remap to icon_NxN.png to preserve existing naming convention.\n\nasync function remapSetOutput(outDir: string): Promise {\n const entries = await readdir(outDir)\n const result: IconInfo[] = []\n for (const name of entries) {\n const match = name.match(/^(\\d+)x\\d+\\.png$/)\n if (!match) {\n continue\n }\n const size = parseInt(match[1], 10)\n const oldPath = path.join(outDir, name)\n const newPath = path.join(outDir, `icon_${size}x${size}.png`)\n await rename(oldPath, newPath)\n result.push({ file: newPath, size })\n }\n return result.sort((a, b) => a.size - b.size)\n}\n\n// ─── CLI output collector ─────────────────────────────────────────────────────\n\nasync function collectCliOutput(outDir: string, format: IconFormat, sourceMaxSize = 0): Promise {\n if (format === \"icns\") {\n return [{ file: path.join(outDir, \"icon.icns\"), size: sourceMaxSize }]\n }\n if (format === \"ico\") {\n const icoFile = path.join(outDir, \"icon.ico\")\n const size = await getIcoMaxSize(icoFile)\n return [{ file: icoFile, size: size ?? sourceMaxSize }]\n }\n return remapSetOutput(outDir)\n}\n\n// ─── File resolution (matches go fileResolver.go + icon-converter.go) ────────\n\nfunction imageHasExtension(name: string, format: string): boolean {\n return name.endsWith(\".\" + format) || name.endsWith(\".png\") || name.endsWith(\".ico\") || name.endsWith(\".svg\") || name.endsWith(\".icns\")\n}\n\nexport function buildSourceCandidates(sources: string[], format: IconFormat): string[] {\n const result: string[] = []\n for (const src of sources) {\n if (imageHasExtension(src, format)) {\n result.push(src)\n } else {\n if (format !== \"set\") {\n result.push(src + \".\" + format)\n }\n result.push(src)\n result.push(src + \".png\")\n result.push(src + \".svg\")\n if (format !== \"icns\") {\n result.push(src + \".icns\")\n if (format !== \"ico\") {\n result.push(src + \".ico\")\n }\n }\n }\n }\n if (format !== \"set\") {\n result.push(\"icon.\" + format)\n }\n for (const setName of [\"icons\", \"icon\"]) {\n result.push(setName)\n }\n result.push(\"icon.png\")\n result.push(\"icon.svg\")\n if (format !== \"icns\") {\n result.push(\"icon.icns\")\n if (format !== \"ico\") {\n result.push(\"icon.ico\")\n }\n }\n // Deduplicate while preserving order so resolveSourceFile never stats the same path twice\n return [...new Set(result)]\n}\n\nasync function resolveSourceFile(candidates: string[], roots: string[]): Promise<{ resolved: string; isDir: boolean } | null> {\n for (const candidate of candidates) {\n const absPath = path.isAbsolute(candidate) ? path.normalize(candidate) : null\n const searchPaths = absPath ? [absPath] : roots.map(r => path.join(r, candidate))\n\n for (const p of searchPaths) {\n try {\n const s = await stat(p)\n return { resolved: p, isDir: s.isDirectory() }\n } catch {\n // not found, try next\n }\n }\n }\n return null\n}\n\n// ─── Directory icon collection (go collect-icons.go) ────────────────────────\n\nasync function collectIconsFromDir(dir: string): Promise<{ icons: IconInfo[]; fallbackFile: string | null }> {\n const entries = await readdir(dir)\n const sizeMap = new Map()\n let fallbackFile: string | null = null\n\n for (const name of entries) {\n if (name === \"icon.png\" || name === \"icon.PNG\") {\n fallbackFile = path.join(dir, name)\n continue\n }\n const match = name.match(/^(\\d+)(?:x\\d+)?\\.png$/i)\n if (!match) {\n continue\n }\n const size = parseInt(match[1], 10)\n if (isNaN(size)) {\n continue\n }\n const filePath = path.join(dir, name)\n const existing = sizeMap.get(size)\n if (!existing || name.length < path.basename(existing.file).length) {\n sizeMap.set(size, { file: filePath, size })\n }\n }\n\n const icons = Array.from(sizeMap.values()).sort((a, b) => a.size - b.size)\n return { icons, fallbackFile }\n}\n\n// ─── Main conversion logic ───────────────────────────────────────────────────\n\nasync function doConvertIcon(candidates: string[], roots: string[], format: IconFormat, outDir: string): Promise {\n const found = await resolveSourceFile(candidates, roots)\n if (!found) {\n return null\n }\n\n const { resolved, isDir } = found\n\n // SVG source for set format: return the SVG directly — Linux targets place it in\n // the freedesktop scalable/ dir. Never call getPngSize on an SVG file.\n if (!isDir && resolved.endsWith(\".svg\") && format === \"set\") {\n return [{ file: resolved, size: 1024 }]\n }\n\n const outExt = format === \"set\" ? \".png\" : \".\" + format\n\n // If source already has the target extension and is not a directory, return it directly\n if (!isDir && resolved.endsWith(outExt)) {\n if (format === \"icns\") {\n return [{ file: resolved, size: 0 }]\n }\n if (format === \"ico\") {\n const size = await getIcoMaxSize(resolved)\n if (size === null) {\n throw new IconConversionError(`Icon is not a valid ICO file: ${resolved}`, \"ERR_ICON_UNKNOWN_FORMAT\")\n }\n if (size < 256) {\n throw new IconConversionError(`Icon must be at least 256x256 pixels, provided: ${size}x${size}`, \"ERR_ICON_TOO_SMALL\")\n }\n return [{ file: resolved, size }]\n }\n // set: source is already a .png — return as-is with its dimensions\n const { width, height } = await getPngSize(resolved)\n return [{ file: resolved, size: Math.max(width, height) }]\n }\n\n if (isDir) {\n const { icons, fallbackFile } = await collectIconsFromDir(resolved)\n\n if (format === \"set\") {\n if (icons.length > 0) {\n return icons\n }\n if (fallbackFile) {\n return doConvertSingleFile(fallbackFile, format, outDir)\n }\n return null\n }\n\n if (icons.length > 0) {\n // Use largest available PNG from the directory as CLI input\n const maxIcon = icons[icons.length - 1]\n await mkdir(outDir, { recursive: true })\n await runIconsTool({ inputFile: maxIcon.file, outputFormat: format, outDir })\n return collectCliOutput(outDir, format, maxIcon.size)\n }\n\n if (fallbackFile) {\n return doConvertSingleFile(fallbackFile, format, outDir)\n }\n return null\n }\n\n // Single file: ICNS → ico or set — pass ICNS directly to CLI (CLI handles extraction)\n if (resolved.endsWith(\".icns\") && format !== \"icns\") {\n await mkdir(outDir, { recursive: true })\n await runIconsTool({ inputFile: resolved, outputFormat: format, outDir })\n return collectCliOutput(outDir, format)\n }\n\n return doConvertSingleFile(resolved, format, outDir)\n}\n\nasync function doConvertSingleFile(sourceFile: string, format: IconFormat, outDir: string): Promise {\n const ext = path.extname(sourceFile).toLowerCase()\n let maxSize: number\n\n if (ext === \".svg\") {\n maxSize = 1024 // CLI rasterizes SVG at 1024px\n } else {\n const { width, height } = await getPngSize(sourceFile)\n maxSize = Math.max(width, height)\n if (maxSize === 0) {\n return null\n }\n const recommendedMin = format === \"icns\" ? 512 : 256\n if (maxSize < recommendedMin) {\n throw new IconConversionError(`Icon must be at least ${recommendedMin}x${recommendedMin} pixels, provided: ${maxSize}x${maxSize}`, \"ERR_ICON_TOO_SMALL\")\n }\n }\n\n await mkdir(outDir, { recursive: true })\n await runIconsTool({ inputFile: sourceFile, outputFormat: format, outDir })\n return collectCliOutput(outDir, format, maxSize)\n}\n"]}