export interface Config {
  /** Port for the HTTP server */
  port: number;
  /** Coder API base URL (e.g. https://coder.samson.media) */
  coderUrl: string;
  /** Coder API session token */
  coderToken: string;
  /** Coder template ID for workspaces */
  coderTemplateId: string;
  /** Gitea API token for the dev bot account */
  giteaDevToken: string;
  /** Gitea API token for the review bot account */
  giteaReviewToken: string;
  /** Anthropic API key passed to Claude Code in workspaces (fallback) */
  anthropicApiKey: string;
  /** Claude Code OAuth token for Max subscription (preferred) */
  claudeOauthToken: string;
  /** Username of the dev bot (to filter out self-replies) */
  botDevUsername: string;
  /** Username of the review bot (to filter out self-replies) */
  botReviewUsername: string;
  /** Gitea base URL (e.g. https://gitea.samson.media) */
  giteaUrl: string;
  /** Base URL for task-complete callbacks (e.g. https://sdlc.samson.media) */
  callbackUrl: string;
  /** Optional webhook secret for verifying Gitea signatures */
  webhookSecret?: string;
  /** Redis connection URL (e.g. redis://redis:6379) */
  redisUrl: string;
  /** Max concurrent workspace creations (default: 2) */
  queueConcurrency: number;
  /** Max concurrent cleanup jobs (default: 5) */
  cleanupConcurrency: number;
  /** Minutes before a workspace is considered stale (default: 120) */
  staleWorkspaceMinutes: number;
}

function required(name: string): string {
  const value = process.env[name];
  if (!value) {
    throw new Error(`Missing required environment variable: ${name}`);
  }
  return value;
}

export function loadConfig(): Config {
  return {
    port: parseInt(process.env.PORT || "3000", 10),
    coderUrl: required("CODER_URL"),
    coderToken: required("CODER_TOKEN"),
    coderTemplateId: required("CODER_TEMPLATE_ID"),
    giteaDevToken: required("GITEA_DEV_TOKEN"),
    giteaReviewToken: required("GITEA_REVIEW_TOKEN"),
    anthropicApiKey: process.env.ANTHROPIC_API_KEY || "",
    claudeOauthToken: process.env.CLAUDE_OAUTH_TOKEN || "",
    botDevUsername: process.env.BOT_DEV_USERNAME || "claude-dev",
    botReviewUsername: process.env.BOT_REVIEW_USERNAME || "claude-review",
    giteaUrl: process.env.GITEA_URL || "https://gitea.samson.media",
    callbackUrl: required("CALLBACK_URL"),
    webhookSecret: process.env.WEBHOOK_SECRET,
    redisUrl: required("REDIS_URL"),
    queueConcurrency: parseInt(process.env.QUEUE_CONCURRENCY || "2", 10),
    cleanupConcurrency: parseInt(process.env.CLEANUP_CONCURRENCY || "5", 10),
    staleWorkspaceMinutes: parseInt(process.env.STALE_WORKSPACE_MINUTES || "120", 10),
  };
}