import os from "os";
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";
const MAX_VERSIONS_TO_CACHE = 8;
// get platform specific cache directory adapted from playwright's handling
// https://github.com/microsoft/playwright/blob/7d924470d397975a74a19184c136b3573a974e13/packages/playwright-core/src/utils/registry.ts#L141
async function getCacheDirectory() {
    let result;
    const envDefined = process.env["NEXT_SWC_PATH"];
    if (envDefined) {
        result = envDefined;
    } else {
        let systemCacheDirectory;
        if (process.platform === "linux") {
            systemCacheDirectory = process.env.XDG_CACHE_HOME || path.join(os.homedir(), ".cache");
        } else if (process.platform === "darwin") {
            systemCacheDirectory = path.join(os.homedir(), "Library", "Caches");
        } else if (process.platform === "win32") {
            systemCacheDirectory = process.env.LOCALAPPDATA || path.join(os.homedir(), "AppData", "Local");
        } else {
            /// Attempt to use generic tmp location for un-handled platform
            if (!systemCacheDirectory) {
                for (const dir of [
                    path.join(os.homedir(), ".cache"),
                    path.join(os.tmpdir())
                ]){
                    if (await fileExists(dir)) {
                        systemCacheDirectory = dir;
                        break;
                    }
                }
            }
            if (!systemCacheDirectory) {
                console.error(new Error("Unsupported platform: " + process.platform));
                process.exit(0);
            }
        }
        result = path.join(systemCacheDirectory, "next-swc");
    }
    if (!path.isAbsolute(result)) {
        // It is important to resolve to the absolute path:
        //   - for unzipping to work correctly;
        //   - so that registry directory matches between installation and execution.
        // INIT_CWD points to the root of `npm/yarn install` and is probably what
        // the user meant when typing the relative path.
        result = path.resolve(process.env["INIT_CWD"] || process.cwd(), result);
    }
    return result;
}
async function extractBinary(outputDirectory, pkgName, tarFileName) {
    const cacheDirectory = await getCacheDirectory();
    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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