// Durable patch for a Windows-only bug in @deno/experimental-route-config@0.0.5
// (pulled in by @deno/svelte-adapter, used only by the `deno desktop` build).
//
// The bug: parseConfig() resolves a static route's destination to an absolute
// Windows path with backslashes (…\_app\immutable\:file*), but parsePattern()'s
// regex only recognizes forward-slash `/:param` syntax. So on Windows the
// `:file*` catch-all is never parsed as a parameter and every client asset
// request tries to open the literal path `…\:file*` → os error 123 → the
// desktop app crashes on first paint. Widening the regex to accept `\` fixes it.
//
// Runs before the desktop compile (chained in deno.json's `desktop` task) so the
// patched code is bundled into the binary. Idempotent; re-run after any
// `deno install`. Reported upstream. Remove once the package ships a fix.

const target = new URL(
	"../node_modules/.deno/@deno+experimental-route-config@0.0.5/node_modules/@deno/experimental-route-config/dist/pattern.js",
	import.meta.url,
);

const NEEDLE = "/(\\/:"; // the source text: /(\/:
const PATCHED = "/([\\\\/]:"; // produces: /([\\/]:

let src: string;
try {
	src = Deno.readTextFileSync(target);
} catch {
	console.log(
		"@deno/experimental-route-config not installed; nothing to patch",
	);
	Deno.exit(0);
}

if (src.includes(PATCHED)) {
	console.log("route-config already patched");
	Deno.exit(0);
}
if (!src.includes(NEEDLE)) {
	console.error(
		"patch target not found — @deno/experimental-route-config may have changed. " +
			"Re-verify the desktop static-serving fix before shipping.",
	);
	Deno.exit(1);
}

Deno.writeTextFileSync(target, src.replace(NEEDLE, PATCHED));
console.log(
	"patched @deno/experimental-route-config for the Windows static-path bug",
);