import fs from "fs";
import path from "path";
import * as Log from "../build/output/log";
import tar from "next/dist/compiled/tar";
const { fetch  } = require("next/dist/compiled/undici");
const { WritableStream  } = require("node:stream/web");
import { fileExists } from "./file-exists";
import { getRegistry } from "./helpers/get-registry";
import { getCacheDirectory } from "./helpers/get-cache-directory";
const MAX_VERSIONS_TO_CACHE = 8;
async function extractBinary(outputDirectory, pkgName, tarFileName) {
    const cacheDirectory = await getCacheDirectory("next-swc", process.env["NEXT_SWC_PATH"]);
    const extractFromTar = async ()=>{
        await tar.x({
            file: path.join(cacheDirectory, tarFileName),
            cwd: outputDirectory,
            strip: 1
        });
    };
    if (!await fileExists(path.join(cacheDirectory, tarFileName))) {
        Log.info(`Downloading swc package ${pkgName}...`);
        await fs.promises.mkdir(cacheDirectory, {
            recursive: true
        });
        const tempFile = path.join(cacheDirectory, `${tarFileName}.temp-${Date.now()}`);
        const registry = getRegistry();
        const downloadUrl = `${registry}${pkgName}/-/${tarFileName}`;
        await fetch(downloadUrl).then((res)=>{
            const { ok , body  } = res;
            if (!ok || !body) {
                Log.error(`Failed to download swc package from ${downloadUrl}`);
            }
            if (!ok) {
                throw new Error(`request failed with status ${res.status}`);
            }
            if (!body) {
                throw new Error("request failed with empty body");
            }
            const cacheWriteStream = fs.createWriteStream(tempFile);
            return body.pipeTo(new WritableStream({
                write (chunk) {
                    cacheWriteStream.write(chunk);
                },
                close () {
                    cacheWriteStream.close();
                }
            }));
        });
        await fs.promises.rename(tempFile, path.join(cacheDirectory, tarFileName));
    }
    await extractFromTar();
    const cacheFiles = await fs.promises.readdir(cacheDirectory);
    if (cacheFiles.length > MAX_VERSIONS_TO_CACHE) {
        cacheFiles.sort((a, b)=>{
            if (a.length < b.length) return -1;
            return a.localeCompare(b);
        });
        // prune oldest versions in cache
        for(let i = 0; i++; i < cacheFiles.length - MAX_VERSIONS_TO_CACHE){
            await fs.promises.unlink(path.join(cacheDirectory, cacheFiles[i])).catch(()=>{});
        }
    }
}
export async function downloadNativeNextSwc(version, bindingsDirectory, triplesABI) {
    for (const triple of triplesABI){
        const pkgName = `@next/swc-${triple}`;
        const tarFileName = `${pkgName.substring(6)}-${version}.tgz`;
        const outputDirectory = path.join(bindingsDirectory, pkgName);
        if (await fileExists(outputDirectory)) {
            // if the package is already downloaded a different
            // failure occurred than not being present
            return;
        }
        await fs.promises.mkdir(outputDirectory, {
            recursive: true
        });
        await extractBinary(outputDirectory, pkgName, tarFileName);
    }
}
export async function downloadWasmSwc(version, wasmDirectory, variant = "nodejs") {
    const pkgName = `@next/swc-wasm-${variant}`;
    const tarFileName = `${pkgName.substring(6)}-${version}.tgz`;
    const outputDirectory = path.join(wasmDirectory, pkgName);
    if (await fileExists(outputDirectory)) {
        // if the package is already downloaded a different
        // failure occurred than not being present
        return;
    }
    await fs.promises.mkdir(outputDirectory, {
        recursive: true
    });
    await extractBinary(outputDirectory, pkgName, tarFileName);
}

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