import assert from "node:assert/strict";
import test from "node:test";
import { selectExecutionBackendForTesting } from "@/lib/execution/backend-selector";

test("selectExecutionBackendForTesting prefers the ready primary master codex node", async () => {
  const backend = await selectExecutionBackendForTesting({
    primary: { provider: "master_codex_node", status: "ready" },
    backups: [
      { provider: "aliyun_qwen_api", status: "ready" },
      { provider: "openai_api", status: "ready" },
    ],
  });

  assert.equal(backend.backendId, "master-codex-node");
});

test("selectExecutionBackendForTesting falls back to ready aliyun qwen before openai", async () => {
  const backend = await selectExecutionBackendForTesting({
    primary: { provider: "master_codex_node", status: "degraded" },
    backups: [
      { provider: "openai_api", status: "ready" },
      { provider: "aliyun_qwen_api", status: "ready" },
    ],
  });

  assert.equal(backend.backendId, "aliyun-qwen");
});

test("selectExecutionBackendForTesting falls back to ready openai when aliyun qwen is unavailable", async () => {
  const backend = await selectExecutionBackendForTesting({
    primary: { provider: "master_codex_node", status: "degraded" },
    backups: [
      { provider: "openai_api", status: "ready" },
      { provider: "aliyun_qwen_api", status: "disabled" },
    ],
  });

  assert.equal(backend.backendId, "openai-api");
});

test("selectExecutionBackendForTesting uses fixed backend order when an API primary is not ready", async () => {
  const backend = await selectExecutionBackendForTesting({
    primary: { provider: "openai_api", status: "degraded" },
    backups: [
      { provider: "master_codex_node", status: "ready" },
      { provider: "aliyun_qwen_api", status: "ready" },
    ],
  });

  assert.equal(backend.backendId, "aliyun-qwen");
});

test("selectExecutionBackendForTesting does not let an earlier disabled backup hide a later ready account", async () => {
  const backend = await selectExecutionBackendForTesting({
    primary: { provider: "master_codex_node", status: "degraded" },
    backups: [
      { provider: "openai_api", status: "disabled" },
      { provider: "openai_api", status: "ready" },
    ],
  });

  assert.equal(backend.backendId, "openai-api");
});

test("selectExecutionBackendForTesting falls back to master node last when higher-priority API backends are unavailable", async () => {
  const backend = await selectExecutionBackendForTesting({
    primary: { provider: "openai_api", status: "degraded" },
    backups: [
      { provider: "aliyun_qwen_api", status: "disabled" },
      { provider: "master_codex_node", status: "ready" },
    ],
  });

  assert.equal(backend.backendId, "master-codex-node");
});