const path = require("path");
const mergeOptions = require('merge-options').bind({concatArrays: true});
const commonOptions = require("./vite.common-config.js");

const srcDir = path.join(__dirname, "src/");
const modulesDir = path.join(srcDir, "node_modules/");
const mocksDir = path.join(srcDir, "mocks/");
const fixturesDir = path.join(srcDir, "fixtures/");

const commonOutput = {
    manualChunks: (id) => {
        if (id.endsWith("/lib.ts")) {
            console.log(id, arguments);
            return "es/lib";
        }
        if (id.startsWith(srcDir)) {
            const idPath = id.substring(srcDir.length);
            const pathWithoutExt = idPath.substring(0, idPath.lastIndexOf("."));
            return pathWithoutExt;
        } else {
            return "index";
        }
    },
    chunkFileNames: `[format]/[name].js`,
    assetFileNames: `assets/[name][extname]`,
    // important to preserve export names of every module
    // so we can still override the file and provider alternative impls
    minifyInternalExports: false,
    preferConst: true,
};

export default mergeOptions(commonOptions, {
    root: "src/",
    plugins: [
        {
            name: "showconfig",
            buildStart(rollupOptions) {
                console.dir(rollupOptions, {depth: 100});
            },
            resolveId(source, importer) {
                console.log(source, importer);
            }
        }
    ],
    build: {
        minify: false,
        sourcemap: false,
        outDir: "../target",
        rollupOptions: {
            input: "./src/lib.ts",
            treeshake: false,
            external: (id, parentId) => {
                const resolveId = (id.startsWith("./") || id.startsWith("../")) ? path.join(path.dirname(parentId), id) : id;
                return !resolveId.startsWith(srcDir) || resolveId.startsWith(mocksDir) || resolveId.startsWith(fixturesDir);
            },
            preserveEntrySignatures: "strict",
            output: [
                Object.assign({}, commonOutput, {format: "es"}),
                Object.assign({}, commonOutput, {format: "cjs"}),
            ]
        }
    },
});