import path from "node:path";

import { config as loadDotEnv } from "dotenv";

import type { AtlassianConfig } from "./types.js";

function normalizeBaseUrl(value: string) {
  return value.replace(/\/+$/, "");
}

function readRequired(env: NodeJS.ProcessEnv, key: string) {
  const value = env[key]?.trim();

  if (!value) {
    throw new Error(`Missing required environment variable: ${key}`);
  }

  return value;
}

export function loadConfig(
  env: NodeJS.ProcessEnv = process.env,
  options?: {
    cwd?: string;
  },
): AtlassianConfig {
  loadDotEnv({
    path: path.resolve(options?.cwd ?? process.cwd(), ".env"),
    processEnv: env as Record<string, string>,
    override: false,
  });

  const baseUrl = normalizeBaseUrl(readRequired(env, "ATLASSIAN_BASE_URL"));

  return {
    baseUrl,
    jiraBaseUrl: normalizeBaseUrl(env.ATLASSIAN_JIRA_BASE_URL?.trim() || baseUrl),
    confluenceBaseUrl: normalizeBaseUrl(env.ATLASSIAN_CONFLUENCE_BASE_URL?.trim() || baseUrl),
    email: readRequired(env, "ATLASSIAN_EMAIL"),
    apiToken: readRequired(env, "ATLASSIAN_API_TOKEN"),
    defaultProject: env.ATLASSIAN_DEFAULT_PROJECT?.trim() || undefined,
    defaultSpace: env.ATLASSIAN_DEFAULT_SPACE?.trim() || undefined,
  };
}

export function createBasicAuthHeader(config: {
  email: string;
  apiToken: string;
  [key: string]: unknown;
}) {
  return `Basic ${Buffer.from(`${config.email}:${config.apiToken}`).toString("base64")}`;
}