import fs from 'node:fs'; import path from 'node:path';

export const DEFAULT_ENV_FILES = ['scripts/chat-preprocess.env', '.env.local', '.env'];

export type LoadedEnvFile = { path: string; loaded: boolean; };

type ParsedEntry = { key: string; value: string; };

function parseLine(line: string): ParsedEntry | null { if (!line || line.trim().startsWith('#')) { return null; }

const [rawKey, ...rest] = line.split('='); if (!rawKey || rest.length === 0) { return null; }

const key = rawKey.trim(); if (!key) { return null; }

const value = rest .join('=') .trim() .replace(/^['"]|['"]$/g, ''); return { key, value }; }

export function loadPreprocessEnv(customPaths?: string[]): LoadedEnvFile[] { const envFiles = customPaths?.length ? customPaths : DEFAULT_ENV_FILES; const loaded: LoadedEnvFile[] = [];

for (const relativePath of envFiles) { const filePath = path.resolve(process.cwd(), relativePath); if (!fs.existsSync(filePath)) { loaded.push({ path: relativePath, loaded: false }); continue; }

const contents = fs.readFileSync(filePath, 'utf-8');
for (const line of contents.split(/\r?

/)) { const parsed = parseLine(line); if (!parsed) { continue; }

  if (process.env[parsed.key] === undefined) {
    process.env[parsed.key] = parsed.value;
  }
}

loaded.push({ path: relativePath, loaded: true });

}

return loaded; }

export function requireEnv(key: string, errorMessage?: string): string { const value = process.env[key]; if (!value) { throw new Error(errorMessage ?? ${key} is required); } return value; }