import { stringify } from "querystring";
import { getModuleBuildInfo } from "../get-module-build-info";
import { RouteKind } from "../../../../server/future/route-kind";
import { normalizePagePath } from "../../../../shared/lib/page-path/normalize-page-path";
import { decodeFromBase64, encodeToBase64 } from "../utils";
import { isInstrumentationHookFile } from "../../../worker";
import { loadEntrypoint } from "../../../load-entrypoint";
/**
 * Returns the loader entry for a given page.
 *
 * @param options the options to create the loader entry
 * @returns the encoded loader entry
 */ export function getRouteLoaderEntry(options) {
    switch(options.kind){
        case RouteKind.PAGES:
            {
                const query = {
                    kind: options.kind,
                    page: options.page,
                    preferredRegion: options.preferredRegion,
                    absolutePagePath: options.absolutePagePath,
                    // These are the path references to the internal components that may be
                    // overridden by userland components.
                    absoluteAppPath: options.pages["/_app"],
                    absoluteDocumentPath: options.pages["/_document"],
                    middlewareConfigBase64: encodeToBase64(options.middlewareConfig)
                };
                return `next-route-loader?${stringify(query)}!`;
            }
        case RouteKind.PAGES_API:
            {
                const query = {
                    kind: options.kind,
                    page: options.page,
                    preferredRegion: options.preferredRegion,
                    absolutePagePath: options.absolutePagePath,
                    middlewareConfigBase64: encodeToBase64(options.middlewareConfig)
                };
                return `next-route-loader?${stringify(query)}!`;
            }
        default:
            {
                throw new Error("Invariant: Unexpected route kind");
            }
    }
}
const loadPages = async ({ page , absolutePagePath , absoluteDocumentPath , absoluteAppPath , preferredRegion , middlewareConfigBase64  }, buildInfo)=>{
    const middlewareConfig = decodeFromBase64(middlewareConfigBase64);
    // Attach build info to the module.
    buildInfo.route = {
        page,
        absolutePagePath,
        preferredRegion,
        middlewareConfig
    };
    let file = await loadEntrypoint("pages", {
        VAR_USERLAND: absolutePagePath,
        VAR_MODULE_DOCUMENT: absoluteDocumentPath,
        VAR_MODULE_APP: absoluteAppPath,
        VAR_DEFINITION_PAGE: normalizePagePath(page),
        VAR_DEFINITION_PATHNAME: page
    });
    if (isInstrumentationHookFile(page)) {
        // When we're building the instrumentation page (only when the
        // instrumentation file conflicts with a page also labeled
        // /instrumentation) hoist the `register` method.
        file += '\nexport const register = hoist(userland, "register")';
    }
    return file;
};
const loadPagesAPI = async ({ page , absolutePagePath , preferredRegion , middlewareConfigBase64  }, buildInfo)=>{
    const middlewareConfig = decodeFromBase64(middlewareConfigBase64);
    // Attach build info to the module.
    buildInfo.route = {
        page,
        absolutePagePath,
        preferredRegion,
        middlewareConfig
    };
    return await loadEntrypoint("pages-api", {
        VAR_USERLAND: absolutePagePath,
        VAR_DEFINITION_PAGE: normalizePagePath(page),
        VAR_DEFINITION_PATHNAME: page
    });
};
/**
 * Handles the `next-route-loader` options.
 * @returns the loader definition function
 */ const loader = async function() {
    if (!this._module) {
        throw new Error("Invariant: expected this to reference a module");
    }
    const buildInfo = getModuleBuildInfo(this._module);
    const opts = this.getOptions();
    switch(opts.kind){
        case RouteKind.PAGES:
            {
                return await loadPages(opts, buildInfo);
            }
        case RouteKind.PAGES_API:
            {
                return await loadPagesAPI(opts, buildInfo);
            }
        default:
            {
                throw new Error("Invariant: Unexpected route kind");
            }
    }
};
export default loader;

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