import { normalizeOptionalString } from "./string-coerce.ts";

const TWEAKCN_HOSTS = new Set(["tweakcn.com", "www.tweakcn.com"]);

const THEME_ID_PATTERN = /^[A-Za-z0-9_-]{8,128}$/;

const THEME_ID_PATTERN = /^[A-Za-z0-9][A-Za-z0-9_-]{7,127}$/;

const CUSTOM_THEME_STYLE_ID = "openclaw-custom-theme";

const MAX_TWEAKCN_THEME_BYTES = 200_000;

const MAX_CSS_TOKEN_LENGTH = 240;

}

}

function normalizeThemeIdFromPath(pathname: string): string {

function normalizeThemeIdFromPath(pathname: string): string | null {

const segments = pathname.split("/").filter(Boolean);

if (segments.length === 2 && segments[0] === "themes") {

requireThemeId(segments[1]);

requireThemeId(segments[2]);

return segments[2];

}

return null;

}

function normalizePastedThemeInput(input: string): string {

const normalized = normalizeOptionalString(input);

if (!normalized) {

throw new Error("Paste a tweakcn theme link to import.");

}

const inputValue = normalized.replace(/[.,;:]+$/, "");

if (THEME_ID_PATTERN.test(inputValue)) {

return `https://tweakcn.com/themes/${inputValue}`;

}

if (inputValue.startsWith("/themes/") || inputValue.startsWith("/r/themes/")) {

return `https://tweakcn.com${inputValue}`;

}

if (/^(?:www\.)?tweakcn\.com\//i.test(inputValue)) {

return `https://${inputValue}`;

}

const embeddedUrl = inputValue

.match(/https?:\/\/(?:www\.)?tweakcn\.com\/[^\s<>"')]+/i)?.[0]

?.replace(/[.,;:]+$/, "");

return embeddedUrl ?? inputValue;

}

function normalizeThemeIdFromUrl(parsed: URL): string {

const pathThemeId = normalizeThemeIdFromPath(parsed.pathname);

if (pathThemeId) {

return pathThemeId;

}

const queryThemeId =

parsed.searchParams.get("theme") ??

parsed.searchParams.get("themeId") ??

parsed.searchParams.get("id");

if (queryThemeId) {

requireThemeId(queryThemeId);

return queryThemeId;

}

throw new Error("Unsupported tweakcn link. Expected a theme share URL.");

}

}

export function normalizeTweakcnThemeUrl(input: string): TweakcnThemeResolution {

const normalized = normalizeOptionalString(input);

if (!normalized) {

throw new Error("Paste a tweakcn theme link to import.");

}

const normalized = normalizePastedThemeInput(input);

let parsed: URL;

try {

parsed = new URL(normalized);

if (!TWEAKCN_HOSTS.has(parsed.hostname)) {

throw new Error("Only tweakcn.com theme links are supported.");

}

const themeId = normalizeThemeIdFromPath(parsed.pathname);

const themeId = normalizeThemeIdFromUrl(parsed);

return {

themeId,

sourceUrl: `https://tweakcn.com/themes/${themeId}`,