/**
 * Tests for gateway-proxy.ts — Go Gateway integration layer
 *
 * These tests verify the proxy functions that bridge Node.js tRPC
 * procedures to the Go Gateway service.
 */
import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";

// ─── Mock fetch globally ───────────────────────────────────────────────────────
const mockFetch = vi.fn();
vi.stubGlobal("fetch", mockFetch);

// Helper to create a mock Response
function mockResponse(body: unknown, status = 200) {
  return {
    ok: status >= 200 && status < 300,
    status,
    json: async () => body,
    text: async () => JSON.stringify(body),
  } as Response;
}

// Import after mock setup
import {
  checkGatewayHealth,
  isGatewayAvailable,
  getGatewayOrchestratorConfig,
  getGatewayTools,
  type GatewayToolDef,
} from "./gateway-proxy";

describe("Go Gateway Proxy", () => {
  beforeEach(() => {
    mockFetch.mockReset();
    // Default: gateway is available
    process.env.GATEWAY_URL = "http://localhost:18789";
  });

  afterEach(() => {
    vi.clearAllMocks();
  });

  // ─── checkGatewayHealth ──────────────────────────────────────────────────────

  describe("checkGatewayHealth", () => {
    it("returns connected=true when gateway responds with ok status", async () => {
      mockFetch.mockResolvedValueOnce(
        mockResponse({
          status: "ok",
          service: "goclaw-gateway",
          version: "1.0.0",
          ollama: { connected: true, latencyMs: 5 },
        })
      );

      const result = await checkGatewayHealth();
      expect(result.connected).toBe(true);
      expect(result.latencyMs).toBeGreaterThanOrEqual(0);
    });

    it("returns connected=false when gateway is unreachable", async () => {
      mockFetch.mockRejectedValueOnce(new Error("Connection refused"));

      const result = await checkGatewayHealth();
      expect(result.connected).toBe(false);
      expect(result.latencyMs).toBe(0);
    });

    it("returns connected=false when gateway returns non-ok status", async () => {
      mockFetch.mockResolvedValueOnce(mockResponse({ error: "Internal Server Error" }, 500));

      const result = await checkGatewayHealth();
      expect(result.connected).toBe(false);
    });

    it("includes llm health info when gateway is healthy", async () => {
      mockFetch.mockResolvedValueOnce(
        mockResponse({
          status: "ok",
          ollama: { connected: true, latencyMs: 12 },
        })
      );

      const result = await checkGatewayHealth();
      expect(result.connected).toBe(true);
      expect(result.llm).toBeDefined();
      expect(result.llm?.connected).toBe(true);
    });
  });

  // ─── isGatewayAvailable ──────────────────────────────────────────────────────

  describe("isGatewayAvailable", () => {
    it("returns true when gateway health check succeeds", async () => {
      mockFetch.mockResolvedValueOnce(mockResponse({ status: "ok" }));

      const available = await isGatewayAvailable();
      expect(available).toBe(true);
    });

    it("returns false when gateway is unreachable", async () => {
      mockFetch.mockRejectedValueOnce(new Error("ECONNREFUSED"));

      const available = await isGatewayAvailable();
      expect(available).toBe(false);
    });
  });

  // ─── getGatewayOrchestratorConfig ───────────────────────────────────────────

  describe("getGatewayOrchestratorConfig", () => {
    it("returns orchestrator config when gateway responds", async () => {
      const mockConfig = {
        id: 1,
        name: "Orchestrator",
        model: "qwen2.5:7b",
        temperature: 0.5,
        maxTokens: 8192,
        allowedTools: ["shell_exec", "file_read", "file_list"],
        systemPromptPreview: "You are GoClaw Orchestrator.",
      };
      mockFetch.mockResolvedValueOnce(mockResponse(mockConfig));

      const config = await getGatewayOrchestratorConfig();
      expect(config).not.toBeNull();
      expect(config?.model).toBe("qwen2.5:7b");
      expect(config?.allowedTools).toContain("shell_exec");
      expect(config?.temperature).toBe(0.5);
    });

    it("returns null when gateway is unreachable", async () => {
      mockFetch.mockRejectedValueOnce(new Error("Network error"));

      const config = await getGatewayOrchestratorConfig();
      expect(config).toBeNull();
    });

    it("returns null when gateway returns non-ok status", async () => {
      mockFetch.mockResolvedValueOnce(mockResponse({ error: "not found" }, 404));

      const config = await getGatewayOrchestratorConfig();
      expect(config).toBeNull();
    });
  });

  // ─── getGatewayTools ────────────────────────────────────────────────────────

  describe("getGatewayTools", () => {
    it("maps OpenAI-format tools to GatewayToolDef", async () => {
      // Go Gateway returns OpenAI format: {type: "function", function: {...}}
      const openAITools = {
        count: 2,
        tools: [
          {
            type: "function",
            function: {
              name: "shell_exec",
              description: "Execute a bash command on the host system.",
              parameters: {
                type: "object",
                properties: { command: { type: "string" } },
                required: ["command"],
              },
            },
          },
          {
            type: "function",
            function: {
              name: "file_read",
              description: "Read a file from the filesystem.",
              parameters: {
                type: "object",
                properties: { path: { type: "string" } },
                required: ["path"],
              },
            },
          },
        ],
      };
      mockFetch.mockResolvedValueOnce(mockResponse(openAITools));

      const tools = await getGatewayTools();
      expect(tools).not.toBeNull();
      expect(tools).toHaveLength(2);

      const shellTool = tools![0] as GatewayToolDef;
      expect(shellTool.name).toBe("shell_exec");
      expect(shellTool.description).toContain("bash command");
      expect(shellTool.parameters).toBeDefined();
    });

    it("also handles flat format tools (name, description, parameters)", async () => {
      const flatTools = {
        count: 1,
        tools: [
          {
            name: "file_list",
            description: "List files at a path.",
            parameters: { type: "object", properties: { path: { type: "string" } } },
          },
        ],
      };
      mockFetch.mockResolvedValueOnce(mockResponse(flatTools));

      const tools = await getGatewayTools();
      expect(tools).not.toBeNull();
      expect(tools![0].name).toBe("file_list");
    });

    it("returns null when gateway is unreachable", async () => {
      mockFetch.mockRejectedValueOnce(new Error("Connection refused"));

      const tools = await getGatewayTools();
      expect(tools).toBeNull();
    });

    it("returns null when response has no tools array", async () => {
      mockFetch.mockResolvedValueOnce(mockResponse({ error: "no tools" }));

      const tools = await getGatewayTools();
      expect(tools).toBeNull();
    });
  });
});