import { describe, expect, test } from "bun:test";
import { readFileSync } from "node:fs";
import { join } from "node:path";
import { renderHysteriaConfig } from "../src/steps/config";
import { assertHysteriaConfigMatchesProfile } from "../src/steps/configAssertions";
import { baselineConfig, testContext } from "./fixtures";

const TEMPLATE = readFileSync(
  join(import.meta.dir, "..", "..", "package", "templates", "hysteria", "config.yaml.tpl"),
  "utf8"
);

function renderFor(overrides: Record<string, string | null> = {}) {
  const config = baselineConfig(overrides);
  return { config, yaml: renderHysteriaConfig(testContext(config), TEMPLATE) };
}

describe("сгенерированный конфиг проходит собственную семантическую проверку", () => {
  for (const obfsType of ["gecko", "salamander"]) {
    for (const tlsMode of ["acme", "file"]) {
      test(`obfs=${obfsType}, tls=${tlsMode}`, () => {
        const { config, yaml } = renderFor({
          HY2XS_HYSTERIA_OBFS_TYPE: obfsType,
          HY2XS_TLS_MODE: tlsMode
        });
        expect(() => assertHysteriaConfigMatchesProfile(yaml, config)).not.toThrow();
      });
    }
  }
});

describe("подмены в конфиге обнаруживаются", () => {
  test("тип obfs не совпадает с профилем", () => {
    const { config, yaml } = renderFor({ HY2XS_HYSTERIA_OBFS_TYPE: "gecko" });
    const tampered = yaml.replace("type: gecko", "type: salamander");
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/obfs.*type/);
  });

  test("в obfs остался второй подтип", () => {
    const { config, yaml } = renderFor({ HY2XS_HYSTERIA_OBFS_TYPE: "gecko" });
    const tampered = yaml.replace(
      "obfs:\n  type: gecko",
      "obfs:\n  salamander:\n    password: \"leftover\"\n  type: gecko"
    );
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/exactly the gecko subsection/);
  });

  test("изменённый gecko packet size", () => {
    const { config, yaml } = renderFor();
    const tampered = yaml.replace("maxPacketSize: 1200", "maxPacketSize: 1400");
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/maxPacketSize/);
  });

  test("stateless reset выключен", () => {
    const { config, yaml } = renderFor();
    const tampered = yaml.replace("disableStatelessReset: false", "disableStatelessReset: true");
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/disableStatelessReset/);
  });

  test("loss compensation выключена", () => {
    const { config, yaml } = renderFor();
    const tampered = yaml.replace("disableLossCompensation: false", "disableLossCompensation: true");
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/disableLossCompensation/);
  });

  test("подменён congestion controller", () => {
    const { config, yaml } = renderFor();
    const tampered = yaml.replace("type: bbr", "type: reno");
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/congestion\.type/);
  });

  test("подменён bbr profile", () => {
    const { config, yaml } = renderFor();
    const tampered = yaml.replace("bbrProfile: standard", "bbrProfile: aggressive");
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/bbrProfile/);
  });

  test("исчезла секция congestion", () => {
    const { config, yaml } = renderFor();
    const tampered = yaml.replace(/congestion:\n {2}type: bbr\n {2}bbrProfile: standard\n/, "");
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/missing required section congestion/);
  });

  test("auth url потерял machine token", () => {
    const { config, yaml } = renderFor();
    const tampered = yaml.replace(/\?access_token=[^\s]*/, "");
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/machine access token/);
  });

  test("пустой obfs-пароль", () => {
    const { config, yaml } = renderFor();
    const tampered = yaml.replace(/password: "[^"]*"/, 'password: ""');
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/non-empty string/);
  });

  test("acme-профиль с посторонней tls-секцией", () => {
    const { config, yaml } = renderFor({ HY2XS_TLS_MODE: "acme" });
    const tampered = `${yaml}\ntls:\n  cert: /tmp/x.crt\n  key: /tmp/x.key\n`;
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/must not emit a tls section/);
  });

  test("file-профиль с посторонней acme-секцией", () => {
    const { config, yaml } = renderFor({ HY2XS_TLS_MODE: "file" });
    const tampered = `${yaml}\nacme:\n  domains:\n    - x.example.com\n`;
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/must not emit an acme section/);
  });

  test("подменён listen", () => {
    const { config, yaml } = renderFor();
    const tampered = yaml.replace("listen: 0.0.0.0:443", "listen: 0.0.0.0:8443");
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/listen must be/);
  });

  test("подменён trafficStats listen", () => {
    const { config, yaml } = renderFor();
    const tampered = yaml.replace("127.0.0.1:36712", "0.0.0.0:36712");
    expect(() => assertHysteriaConfigMatchesProfile(tampered, config)).toThrow(/trafficStats\.listen/);
  });

  test("невалидный YAML отвергается", () => {
    const { config } = renderFor();
    expect(() => assertHysteriaConfigMatchesProfile("just a string", config)).toThrow();
  });
});