import type { ConcreteNetwork, GeoTarget } from "@fetcha/core";
import { executeHttp } from "./http";
import type { ProviderHealth, ProviderRequest, ProviderResponse, ProxyEndpoint, ProxyProvider } from "./types";
import { probeHealth } from "./probe";

/**
 * SOAX residential / mobile network. Gateway `proxy.soax.com:5000`.
 * Username grammar: `package-<id>[-country-xx][-region-xxx][-city-xxx][-sessionid-<id>][-sessionlength-<sec>]`.
 * Documentation: https://helpcenter.soax.com/
 *
 * The adapter is complete but the platform only routes to it once credentials are present
 * (`SOAX_USERNAME` / `SOAX_PASSWORD`). Until then `isConfigured()` is false and the admin
 * dashboard shows it as "unconfigured" — we never pretend a route exists.
 */
export class SoaxProvider implements ProxyProvider {
  readonly id = "soax" as const;
  readonly label = "SOAX";
  readonly networks: ConcreteNetwork[] = ["residential", "mobile"];
  private readonly username: string | undefined;
  private readonly password: string | undefined;
  private readonly prices: Record<string, number>;

  constructor(env: NodeJS.ProcessEnv = process.env, prices: Record<string, number> = { residential: 9, mobile: 15 }) {
    this.username = env.SOAX_USERNAME?.trim() || undefined;
    this.password = env.SOAX_PASSWORD?.trim() || undefined;
    this.prices = prices;
  }

  isConfigured(): boolean {
    return Boolean(this.username && this.password);
  }

  supportsGeo(_geo: GeoTarget): boolean {
    return true;
  }

  pricePerGb(network: ConcreteNetwork): number {
    return this.prices[network] ?? this.prices.residential ?? 9;
  }

  estimateCost(network: ConcreteNetwork, bytes: number): number {
    return (bytes / 1_073_741_824) * this.pricePerGb(network);
  }

  /** Build the upstream gateway endpoint for a request (exposed for contract tests; never returned to customers). */
  endpoint(req: Pick<ProviderRequest, "geo" | "sessionKey" | "sessionMinutes">): ProxyEndpoint {
    if (!this.username || !this.password) throw new Error("SOAX is not configured");
    let user = this.username;
    if (req.geo.country) user += `-country-${req.geo.country.toLowerCase()}`;
    if (req.geo.region) user += `-region-${req.geo.region}`;
    if (req.geo.city) user += `-city-${req.geo.city}`;
    if (req.sessionKey) {
      user += `-sessionid-${sanitize(req.sessionKey)}`;
      user += `-sessionlength-${Math.min(Math.max((req.sessionMinutes ?? 10) * 60, 60), 3600)}`;
    }
    return { host: "proxy.soax.com", port: 5000, username: user, password: this.password };
  }

  proxyEndpoint(req: Pick<ProviderRequest, "geo" | "sessionKey" | "sessionMinutes">): ProxyEndpoint | null {
    return this.endpoint(req);
  }

  async fetch(request: ProviderRequest): Promise<ProviderResponse> {
    return executeHttp(this.id, this.endpoint(request), request);
  }

  async health(network: ConcreteNetwork = "residential"): Promise<ProviderHealth> {
    if (!this.isConfigured()) return { provider: this.id, network, status: "unconfigured", latencyMs: null, checkedAt: new Date(), detail: "Missing credentials" };
    return probeHealth(this, network, "https://checker.soax.com/api/ipinfo");
  }
}

function sanitize(s: string): string {
  return s.replace(/[^a-zA-Z0-9]/g, "").slice(0, 32) || "s";
}