import { existsSync } from "fs";
import grabDirNames from "../../utils/grab-dir-names";
import grabConstants from "../../utils/grab-constants";
import grabRootFilePath from "../server/web-pages/grab-root-file-path";
import grabRelativePath from "../../utils/grab-relative-path";
import { log } from "../../utils/log";
const { ROOT_DIR } = grabDirNames();
export default async function grabClientHydrationScript({ page_local_path, }) {
    const { ClientRootElementIDName, ClientRootComponentWindowName, ClientWindowPagePropsName, } = grabConstants();
    const { root_file_path } = grabRootFilePath();
    // const target_path = pagePathTransform({ page_path: page_local_path });
    // const target_root_path = root_file_path
    //     ? pagePathTransform({ page_path: root_file_path })
    //     : undefined;
    if (!existsSync(page_local_path)) {
        return undefined;
    }
    if (root_file_path) {
        if (!existsSync(root_file_path)) {
            return undefined;
        }
        const root_content = await Bun.file(root_file_path).text();
        if (!hasBundlableDefaultExport({
            file_path: root_file_path,
            content: root_content,
            is_root: true,
        })) {
            return undefined;
        }
    }
    const page_content = await Bun.file(page_local_path).text();
    if (!hasBundlableDefaultExport({
        file_path: page_local_path,
        content: page_content,
    })) {
        return undefined;
    }
    let txt = ``;
    txt += `import { hydrateRoot } from "${ROOT_DIR}/node_modules/react-dom/client.js";\n`;
    // txt += `import react from "${ROOT_DIR}/node_modules/react/index.js";\n`;
    if (root_file_path) {
        txt += `import Root from "${root_file_path}";\n`;
    }
    txt += `import Page from "${page_local_path}";\n\n`;
    txt += `const pageProps = window.${ClientWindowPagePropsName} || {};\n`;
    if (root_file_path) {
        txt += `const component = <Root {...pageProps}><Page {...pageProps} /></Root>\n`;
    }
    else {
        txt += `const component = <Page {...pageProps} />\n`;
    }
    txt += `if (window.${ClientRootComponentWindowName}?.render) {\n`;
    txt += `    window.${ClientRootComponentWindowName}.render(component);\n`;
    txt += `} else {\n`;
    txt += `    const root = hydrateRoot(document.getElementById("${ClientRootElementIDName}"), component, { onRecoverableError: () => {\n\n`;
    txt += `        console.log(\`Hydration Error.\`)\n\n`;
    txt += `    } });\n\n`;
    txt += `    window.${ClientRootComponentWindowName} = root;\n`;
    txt += `    window.__BUNEXT_RERENDER__ = (NewPage) => {\n`;
    txt += `        const props = window.${ClientWindowPagePropsName} || {};\n`;
    txt += `        root.render(<NewPage {...props} />);\n`;
    txt += `    };\n`;
    txt += `}\n`;
    return txt;
}
// File path -> content hash of the last warning, so rebuilds don't repeat
// a warning until the file changes.
const warned_files = new Map();
/**
 * # Check a page or root file can be bundled
 * Files are only bundled when `export default` starts a line. Files with
 * no default export at all (e.g. a page still being written) are skipped
 * silently; this warns about the confusing case where one exists
 * elsewhere, like `import X from "x"; export default X` on one line, or
 * `export { Page as default }`.
 */
function hasBundlableDefaultExport({ file_path, content, is_root, }) {
    if (/^export default/m.test(content)) {
        warned_files.delete(file_path);
        return true;
    }
    const has_default_export = /\bexport\s+default\b/.test(content) ||
        /\bas\s+default\b/.test(content);
    if (!has_default_export) {
        warned_files.delete(file_path);
        return false;
    }
    const content_hash = Bun.hash(content);
    if (warned_files.get(file_path) === content_hash)
        return false;
    warned_files.set(file_path, content_hash);
    log.warn(`${grabRelativePath(file_path)} was skipped: ` +
        `\`export default\` must be at the start of a line. ` +
        (is_root
            ? `No pages can be bundled until the root layout is fixed.`
            : `This page will not be bundled.`));
    return false;
}