import { extname } from 'path';
import { detectEsModule } from '../utils/detect_es_module.js';
import { MODULE_FILE_EXTENSION } from '../utils/module_format.js';
import esbuildBundler from './esbuild/index.js';
import nftBundler from './nft/index.js';
import noBundler from './none/index.js';
import { NODE_BUNDLER } from './types.js';
import zisiBundler from './zisi/index.js';
export const getBundler = (name) => {
    switch (name) {
        case NODE_BUNDLER.ESBUILD:
        case NODE_BUNDLER.ESBUILD_ZISI:
            return esbuildBundler;
        case NODE_BUNDLER.NFT:
            return nftBundler;
        case NODE_BUNDLER.ZISI:
            return zisiBundler;
        case NODE_BUNDLER.NONE:
            return noBundler;
        default:
            throw new Error(`Unsupported Node bundler: ${name}`);
    }
};
export const getBundlerName = async ({ config: { nodeBundler }, extension, featureFlags, mainFile, runtimeAPIVersion, }) => {
    // For V2 functions, we force the bundler to NFT. The only exception is when
    // a `none` override was provided.
    if (runtimeAPIVersion === 2) {
        return nodeBundler === NODE_BUNDLER.NONE ? NODE_BUNDLER.NONE : NODE_BUNDLER.NFT;
    }
    if (nodeBundler) {
        return nodeBundler;
    }
    return await getDefaultBundler({ extension, featureFlags, mainFile });
};
const ESBUILD_EXTENSIONS = new Set(['.mjs', '.ts', '.tsx', '.cts', '.mts']);
// We use ZISI as the default bundler, except for certain extensions, for which
// esbuild is the only option.
const getDefaultBundler = async ({ extension, featureFlags, mainFile, }) => {
    if (extension === MODULE_FILE_EXTENSION.MJS && featureFlags.zisi_pure_esm_mjs) {
        return NODE_BUNDLER.NFT;
    }
    if (ESBUILD_EXTENSIONS.has(extension)) {
        return NODE_BUNDLER.ESBUILD;
    }
    if (featureFlags.traceWithNft) {
        return NODE_BUNDLER.NFT;
    }
    const functionIsESM = extname(mainFile) !== MODULE_FILE_EXTENSION.CJS && (await detectEsModule({ mainFile }));
    return functionIsESM ? NODE_BUNDLER.NFT : NODE_BUNDLER.ZISI;
};