import { existsSync, promises } from 'node:fs';
import { resolve, extname, dirname } from 'pathe';
import * as dotenv from 'dotenv';
import { rmdir } from 'node:fs/promises';
import { homedir } from 'node:os';
import createJiti from 'jiti';
import * as rc9 from 'rc9';
import { defu } from 'defu';
import { findWorkspaceDir } from 'pkg-types';

async function setupDotenv(options) {
  const targetEnvironment = options.env ?? process.env;
  const environment = await loadDotenv({
    cwd: options.cwd,
    fileName: options.fileName ?? ".env",
    env: targetEnvironment,
    interpolate: options.interpolate ?? true
  });
  for (const key in environment) {
    if (!key.startsWith("_") && targetEnvironment[key] === void 0) {
      targetEnvironment[key] = environment[key];
    }
  }
  return environment;
}
async function loadDotenv(options) {
  const environment = /* @__PURE__ */ Object.create(null);
  const dotenvFile = resolve(options.cwd, options.fileName);
  if (existsSync(dotenvFile)) {
    const parsed = dotenv.parse(await promises.readFile(dotenvFile, "utf8"));
    Object.assign(environment, parsed);
  }
  if (!options.env._applied) {
    Object.assign(environment, options.env);
    environment._applied = true;
  }
  if (options.interpolate) {
    interpolate(environment);
  }
  return environment;
}
function interpolate(target, source = {}, parse = (v) => v) {
  function getValue(key) {
    return source[key] !== void 0 ? source[key] : target[key];
  }
  function interpolate2(value, parents = []) {
    if (typeof value !== "string") {
      return value;
    }
    const matches = value.match(/(.?\${?(?:[\w:]+)?}?)/g) || [];
    return parse(matches.reduce((newValue, match) => {
      const parts = /(.?)\${?([\w:]+)?}?/g.exec(match);
      const prefix = parts[1];
      let value2, replacePart;
      if (prefix === "\\") {
        replacePart = parts[0];
        value2 = replacePart.replace("\\$", "$");
      } else {
        const key = parts[2];
        replacePart = parts[0].slice(prefix.length);
        if (parents.includes(key)) {
          console.warn(`Please avoid recursive environment variables ( loop: ${parents.join(" > ")} > ${key} )`);
          return "";
        }
        value2 = getValue(key);
        value2 = interpolate2(value2, [...parents, key]);
      }
      return value2 !== void 0 ? newValue.replace(replacePart, value2) : newValue;
    }, value));
  }
  for (const key in target) {
    target[key] = interpolate2(getValue(key));
  }
}

async function loadConfig(options) {
  options.cwd = resolve(process.cwd(), options.cwd || ".");
  options.name = options.name || "config";
  options.configFile = options.configFile ?? (options.name !== "config" ? `${options.name}.config` : "config");
  options.rcFile = options.rcFile ?? `.${options.name}rc`;
  if (options.extend !== false) {
    options.extend = {
      extendKey: "extends",
      ...options.extend
    };
  }
  options.jiti = options.jiti || createJiti(void 0, {
    interopDefault: true,
    requireCache: false,
    esmResolve: true,
    ...options.jitiOptions
  });
  const r = {
    config: {},
    cwd: options.cwd,
    configFile: resolve(options.cwd, options.configFile),
    layers: []
  };
  if (options.dotenv) {
    await setupDotenv({
      cwd: options.cwd,
      ...options.dotenv === true ? {} : options.dotenv
    });
  }
  const { config, configFile } = await resolveConfig(".", options);
  if (configFile) {
    r.configFile = configFile;
  }
  const configRC = {};
  if (options.rcFile) {
    if (options.globalRc) {
      Object.assign(configRC, rc9.readUser({ name: options.rcFile, dir: options.cwd }));
      const workspaceDir = await findWorkspaceDir(options.cwd).catch(() => {
      });
      if (workspaceDir) {
        Object.assign(configRC, rc9.read({ name: options.rcFile, dir: workspaceDir }));
      }
    }
    Object.assign(configRC, rc9.read({ name: options.rcFile, dir: options.cwd }));
  }
  r.config = defu(
    options.overrides,
    config,
    configRC,
    options.defaultConfig
  );
  if (options.extend) {
    await extendConfig(r.config, options);
    r.layers = r.config._layers;
    delete r.config._layers;
    r.config = defu(
      r.config,
      ...r.layers.map((e) => e.config)
    );
  }
  const baseLayers = [
    options.overrides && { config: options.overrides, configFile: void 0, cwd: void 0 },
    { config, configFile: options.configFile, cwd: options.cwd },
    options.rcFile && { config: configRC, configFile: options.rcFile }
  ].filter((l) => l && l.config);
  r.layers = [
    ...baseLayers,
    ...r.layers
  ];
  if (options.defaults) {
    r.config = defu(r.config, options.defaults);
  }
  return r;
}
async function extendConfig(config, options) {
  config._layers = config._layers || [];
  if (!options.extend) {
    return;
  }
  let keys = options.extend.extendKey;
  if (typeof keys === "string") {
    keys = [keys];
  }
  const extendSources = [];
  for (const key of keys) {
    extendSources.push(...(Array.isArray(config[key]) ? config[key] : [config[key]]).filter(Boolean));
    delete config[key];
  }
  for (const extendSource of extendSources) {
    if (typeof extendSource !== "string") {
      console.warn(`Cannot extend config from \`${JSON.stringify(extendSource)}\` (which should be a string) in ${options.cwd}`);
      continue;
    }
    const _config = await resolveConfig(extendSource, options);
    if (!_config.config) {
      console.warn(`Cannot extend config from \`${extendSource}\` in ${options.cwd}`);
      continue;
    }
    await extendConfig(_config.config, { ...options, cwd: _config.cwd });
    config._layers.push(_config);
    if (_config.config._layers) {
      config._layers.push(..._config.config._layers);
      delete _config.config._layers;
    }
  }
}
const GIT_PREFIXES = ["github:", "gitlab:", "bitbucket:", "https://"];
const NPM_PACKAGE_RE = /^(@[\da-z~-][\d._a-z~-]*\/)?[\da-z~-][\d._a-z~-]*$/;
async function resolveConfig(source, options) {
  if (options.resolve) {
    const res2 = await options.resolve(source, options);
    if (res2) {
      return res2;
    }
  }
  if (GIT_PREFIXES.some((prefix) => source.startsWith(prefix))) {
    const { downloadTemplate } = await import('giget');
    const url = new URL(source);
    const gitRepo = url.protocol + url.pathname.split("/").slice(0, 2).join("/");
    const name = gitRepo.replace(/[#/:@\\]/g, "_");
    const tmpDir = process.env.XDG_CACHE_HOME ? resolve(process.env.XDG_CACHE_HOME, "c12", name) : resolve(homedir(), ".cache/c12", name);
    if (existsSync(tmpDir)) {
      await rmdir(tmpDir, { recursive: true });
    }
    const clonned = await downloadTemplate(source, { dir: tmpDir });
    source = clonned.dir;
  }
  if (NPM_PACKAGE_RE.test(source)) {
    try {
      source = options.jiti.resolve(source, { paths: [options.cwd] });
    } catch {
    }
  }
  const isDir = !extname(source);
  const cwd = resolve(options.cwd, isDir ? source : dirname(source));
  if (isDir) {
    source = options.configFile;
  }
  const res = { config: void 0, cwd };
  try {
    res.configFile = options.jiti.resolve(resolve(cwd, source), { paths: [cwd] });
  } catch {
  }
  if (!existsSync(res.configFile)) {
    return res;
  }
  res.config = options.jiti(res.configFile);
  if (typeof res.config === "function") {
    res.config = await res.config();
  }
  return res;
}

export { loadConfig, loadDotenv, setupDotenv };