const fs = require('fs');
const path = require('path');

function absolutePath(value, workspace) {
    if (!value || !workspace) return null;
    const expanded = value.replace(/\$\{workspaceFolder\}/g, workspace);
    return path.resolve(workspace, expanded);
}

function projectForLaunch(configuration, workspace) {
    const explicit = absolutePath(configuration.project, workspace);
    if (explicit) {
        if (!fs.existsSync(path.join(explicit, 'Makefile'))) {
            throw new Error(`Нет Makefile в каталоге проекта: ${explicit}`);
        }
        return explicit;
    }
    const build = absolutePath(configuration.build, workspace);
    if (!build) return null;
    let directory = path.dirname(build);
    while (directory !== path.dirname(directory)) {
        if (fs.existsSync(path.join(directory, 'Makefile'))) {
            return directory;
        }
        if (directory === workspace) break;
        directory = path.dirname(directory);
    }
    return null;
}

function isSprinterMakefile(filename) {
    try {
        return /include\s+\$\(PROJ_ROOT\)\/app\.mk/.test(
            fs.readFileSync(filename, 'utf8'));
    } catch (_) {
        return false;
    }
}

function taskLabel(project, workspace) {
    const relative = path.relative(workspace, project);
    return `Sprinter: Build ${relative || '.'}`;
}

function makeCommand() {
    if (process.platform === 'win32') {
        throw new Error('Native Windows build/debug пока не поддерживается');
    }
    return fs.existsSync('/usr/bin/make') ? '/usr/bin/make' : 'make';
}

module.exports = {absolutePath, projectForLaunch, isSprinterMakefile,
                  taskLabel, makeCommand};