import cp from 'node:child_process';
import debug from 'debug';
import fs from 'graceful-fs';
import path from 'node:path';
import * as tar from 'tar';
import zlib from 'node:zlib';
import { ELECTRON_GYP_DIR } from './constants.js';
import { fetch } from './fetcher.js';
import { downloadLinuxSysroot } from './sysroot-fetcher.js';
import { promisifiedGracefulFs } from './promisifiedGracefulFs.js';
const d = debug('electron-rebuild');
const CDS_URL = 'https://commondatastorage.googleapis.com/chromium-browser-clang';
function getPlatformUrlPrefix(hostOS, hostArch) {
    const prefixMap = {
        'linux': 'Linux_x64',
        'darwin': 'Mac',
        'win32': 'Win',
    };
    let prefix = prefixMap[hostOS];
    if (prefix === 'Mac' && hostArch === 'arm64') {
        prefix = 'Mac_arm64';
    }
    return CDS_URL + '/' + prefix + '/';
}
function getClangDownloadURL(packageFile, packageVersion, hostOS, hostArch) {
    const cdsFile = `${packageFile}-${packageVersion}.tgz`;
    return getPlatformUrlPrefix(hostOS, hostArch) + cdsFile;
}
function getSDKRoot() {
    if (process.env.SDKROOT)
        return process.env.SDKROOT;
    const output = cp.execFileSync('xcrun', ['--sdk', 'macosx', '--show-sdk-path']);
    return output.toString().trim();
}
export async function getClangEnvironmentVars(electronVersion, targetArch) {
    const clangDownloadDir = await downloadClangVersion(electronVersion);
    const clangDir = path.resolve(clangDownloadDir, 'bin');
    const clangArgs = [];
    if (process.platform === 'darwin') {
        clangArgs.push('-isysroot', getSDKRoot());
    }
    const gypArgs = [];
    if (process.platform === 'win32') {
        console.log(await promisifiedGracefulFs.readdir(clangDir));
        gypArgs.push(`/p:CLToolExe=clang-cl.exe`, `/p:CLToolPath=${clangDir}`);
    }
    if (process.platform === 'linux') {
        const sysrootPath = await downloadLinuxSysroot(electronVersion, targetArch);
        clangArgs.push('--sysroot', sysrootPath);
    }
    return {
        env: {
            CC: `"${path.resolve(clangDir, 'clang')}" ${clangArgs.join(' ')}`,
            CXX: `"${path.resolve(clangDir, 'clang++')}" ${clangArgs.join(' ')}`,
        },
        args: gypArgs,
    };
}
function clangVersionFromRevision(update) {
    const regex = /CLANG_REVISION = '([^']+)'\nCLANG_SUB_REVISION = (\d+)\n/g;
    const clangVersionMatch = regex.exec(update);
    if (!clangVersionMatch)
        return null;
    const [, clangVersion, clangSubRevision] = clangVersionMatch;
    return `${clangVersion}-${clangSubRevision}`;
}
function clangVersionFromSVN(update) {
    const regex = /CLANG_REVISION = '([^']+)'\nCLANG_SVN_REVISION = '([^']+)'\nCLANG_SUB_REVISION = (\d+)\n/g;
    const clangVersionMatch = regex.exec(update);
    if (!clangVersionMatch)
        return null;
    const [, clangVersion, clangSvn, clangSubRevision] = clangVersionMatch;
    return `${clangSvn}-${clangVersion.substr(0, 8)}-${clangSubRevision}`;
}
async function downloadClangVersion(electronVersion) {
    d('fetching clang for Electron:', electronVersion);
    const clangDirPath = path.resolve(ELECTRON_GYP_DIR, `${electronVersion}-clang`);
    if (fs.existsSync(path.resolve(clangDirPath, 'bin', 'clang')))
        return clangDirPath;
    await fs.promises.mkdir(ELECTRON_GYP_DIR, { recursive: true });
    const electronDeps = await fetch(`https://raw.githubusercontent.com/electron/electron/v${electronVersion}/DEPS`, 'text');
    const chromiumRevisionExtractor = /'chromium_version':\n\s+'([^']+)/g;
    const chromiumRevisionMatch = chromiumRevisionExtractor.exec(electronDeps);
    if (!chromiumRevisionMatch)
        throw new Error('Failed to determine Chromium revision for given Electron version');
    const chromiumRevision = chromiumRevisionMatch[1];
    d('fetching clang for Chromium:', chromiumRevision);
    const base64ClangUpdate = await fetch(`https://chromium.googlesource.com/chromium/src.git/+/${chromiumRevision}/tools/clang/scripts/update.py?format=TEXT`, 'text');
    const clangUpdate = Buffer.from(base64ClangUpdate, 'base64').toString('utf8');
    const clangVersionString = clangVersionFromRevision(clangUpdate) || clangVersionFromSVN(clangUpdate);
    if (!clangVersionString)
        throw new Error('Failed to determine Clang revision from Electron version');
    d('fetching clang:', clangVersionString);
    const clangDownloadURL = getClangDownloadURL('clang', clangVersionString, process.platform, process.arch);
    const contents = await fetch(clangDownloadURL, 'buffer');
    d('deflating clang');
    zlib.deflateSync(contents);
    const tarPath = path.resolve(ELECTRON_GYP_DIR, `${electronVersion}-clang.tar`);
    if (fs.existsSync(tarPath))
        await fs.promises.rm(tarPath, { recursive: true, force: true });
    await promisifiedGracefulFs.writeFile(tarPath, Buffer.from(contents));
    await fs.promises.mkdir(clangDirPath, { recursive: true });
    d('tar running on clang');
    await tar.x({
        file: tarPath,
        cwd: clangDirPath,
    });
    await fs.promises.rm(tarPath, { recursive: true, force: true });
    d('cleaning up clang tar file');
    return clangDirPath;
}
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