// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
const RE_KEY_VALUE = /^\s*(?:export\s+)?(?<key>[a-zA-Z_]+[a-zA-Z0-9_]*?)\s*=[\ \t]*('\n?(?<notInterpolated>(.|\n)*?)\n?'|"\n?(?<interpolated>(.|\n)*?)\n?"|(?<unquoted>[^\n#]*)) *#*.*$/gm;
const RE_EXPAND_VALUE = /(\${(?<inBrackets>.+?)(\:-(?<inBracketsDefault>.+))?}|(?<!\\)\$(?<notInBrackets>\w+)(\:-(?<notInBracketsDefault>.+))?)/g;
function expandCharacters(str) {
  const charactersMap = {
    "\\n": "\n",
    "\\r": "\r",
    "\\t": "\t"
  };
  return str.replace(/\\([nrt])/g, ($1)=>charactersMap[$1] || "");
}
function expand(str, variablesMap) {
  if (RE_EXPAND_VALUE.test(str)) {
    return expand(str.replace(RE_EXPAND_VALUE, function(...params) {
      const { inBrackets, inBracketsDefault, notInBrackets, notInBracketsDefault } = params[params.length - 1];
      const expandValue = inBrackets || notInBrackets;
      const defaultValue = inBracketsDefault || notInBracketsDefault;
      let value = variablesMap[expandValue];
      if (value === undefined) {
        value = Deno.env.get(expandValue);
      }
      return value === undefined ? expand(defaultValue, variablesMap) : value;
    }), variablesMap);
  } else {
    return str;
  }
}
/**
 * Parse `.env` file output in an object.
 *
 * @example Usage
 * ```ts
 * import { parse } from "@std/dotenv/parse";
 * import { assertEquals } from "@std/assert";
 *
 * const env = parse("GREETING=hello world");
 * assertEquals(env, { GREETING: "hello world" });
 * ```
 *
 * @param text The text to parse.
 * @returns The parsed object.
 */ export function parse(text) {
  const env = {};
  let match;
  const keysForExpandCheck = [];
  while((match = RE_KEY_VALUE.exec(text)) !== null){
    const { key, interpolated, notInterpolated, unquoted } = match?.groups;
    if (unquoted) {
      keysForExpandCheck.push(key);
    }
    env[key] = typeof notInterpolated === "string" ? notInterpolated : typeof interpolated === "string" ? expandCharacters(interpolated) : unquoted.trim();
  }
  //https://github.com/motdotla/dotenv-expand/blob/ed5fea5bf517a09fd743ce2c63150e88c8a5f6d1/lib/main.js#L23
  const variablesMap = {
    ...env
  };
  keysForExpandCheck.forEach((key)=>{
    env[key] = expand(env[key], variablesMap);
  });
  return env;
}
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