import type { HttpService } from "@nestjs/axios";
import { ServiceUnavailableException } from "@nestjs/common";
import type { AgentMessage } from "@mosaic/shared";
import type { AgentProviderConfig } from "@prisma/client";
import { Readable } from "node:stream";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { EncryptionService } from "../../../security/encryption.service";
import { OpenClawSseBridge } from "./openclaw-sse.bridge";
import { OpenClawProvider } from "./openclaw.provider";

describe("Phase 3 gate: OpenClaw provider config registered in DB → provider loaded on boot → sessions returned from /api/mission-control/sessions → inject/pause/kill proxied to gateway", () => {
  let provider: OpenClawProvider;
  let httpService: {
    axiosRef: {
      get: ReturnType<typeof vi.fn>;
      post: ReturnType<typeof vi.fn>;
    };
  };
  let encryptionService: {
    decryptIfNeeded: ReturnType<typeof vi.fn>;
  };

  const config: AgentProviderConfig = {
    id: "cfg-openclaw-1",
    workspaceId: "workspace-1",
    name: "openclaw-home",
    provider: "openclaw",
    gatewayUrl: "https://gateway.example.com",
    credentials: {
      apiToken: "enc:token",
    },
    isActive: true,
    createdAt: new Date("2026-03-07T15:00:00.000Z"),
    updatedAt: new Date("2026-03-07T15:00:00.000Z"),
  };

  beforeEach(() => {
    httpService = {
      axiosRef: {
        get: vi.fn(),
        post: vi.fn(),
      },
    };

    encryptionService = {
      decryptIfNeeded: vi.fn().mockReturnValue("plain-token"),
    };

    provider = new OpenClawProvider(
      config,
      encryptionService as unknown as EncryptionService,
      httpService as unknown as HttpService,
      new OpenClawSseBridge(httpService as unknown as HttpService)
    );
  });

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

  it("maps listSessions from mocked OpenClaw gateway HTTP responses", async () => {
    httpService.axiosRef.get.mockResolvedValue({
      data: {
        sessions: [
          {
            id: "session-1",
            status: "running",
            createdAt: "2026-03-07T15:01:00.000Z",
            updatedAt: "2026-03-07T15:02:00.000Z",
          },
        ],
        total: 1,
      },
    });

    await expect(provider.listSessions()).resolves.toEqual({
      sessions: [
        {
          id: "session-1",
          providerId: "openclaw-home",
          providerType: "openclaw",
          status: "active",
          createdAt: new Date("2026-03-07T15:01:00.000Z"),
          updatedAt: new Date("2026-03-07T15:02:00.000Z"),
        },
      ],
      total: 1,
    });

    expect(httpService.axiosRef.get).toHaveBeenCalledWith(
      "https://gateway.example.com/api/sessions",
      {
        headers: {
          Authorization: "Bearer plain-token",
        },
        params: {
          limit: 50,
        },
      }
    );
  });

  it("maps streamMessages from mock SSE events into AgentMessage output", async () => {
    httpService.axiosRef.get.mockResolvedValue({
      data: Readable.from([
        'event: message\ndata: {"id":"msg-1","role":"assistant","content":"hello from stream","timestamp":"2026-03-07T15:03:00.000Z"}\n\n',
        'event: status\ndata: {"status":"paused","timestamp":"2026-03-07T15:04:00.000Z"}\n\n',
        "data: [DONE]\n\n",
      ]),
    });

    const messages = await collectMessages(provider.streamMessages("session-1"));

    expect(messages).toEqual([
      {
        id: "msg-1",
        sessionId: "session-1",
        role: "assistant",
        content: "hello from stream",
        timestamp: new Date("2026-03-07T15:03:00.000Z"),
      },
      {
        id: expect.any(String),
        sessionId: "session-1",
        role: "system",
        content: "Session status changed to paused",
        timestamp: new Date("2026-03-07T15:04:00.000Z"),
        metadata: {
          status: "paused",
          timestamp: "2026-03-07T15:04:00.000Z",
        },
      },
    ]);
  });

  it("handles unavailable gateway errors", async () => {
    httpService.axiosRef.get.mockRejectedValue(new Error("gateway unavailable"));

    await expect(provider.listSessions()).rejects.toBeInstanceOf(ServiceUnavailableException);
    await expect(provider.listSessions()).rejects.toThrow("gateway unavailable");
  });

  it("handles bad token decryption errors", async () => {
    encryptionService.decryptIfNeeded.mockImplementation(() => {
      throw new Error("bad token");
    });

    await expect(provider.listSessions()).rejects.toBeInstanceOf(ServiceUnavailableException);
    await expect(provider.listSessions()).rejects.toThrow("Failed to decrypt API token");
  });

  it("handles malformed SSE stream responses", async () => {
    vi.useFakeTimers();

    httpService.axiosRef.get.mockResolvedValue({
      data: {
        malformed: true,
      },
    });

    const streamPromise = collectMessages(provider.streamMessages("session-malformed"));
    const rejection = expect(streamPromise).rejects.toThrow(
      "OpenClaw provider openclaw-home failed to stream messages for session session-malformed"
    );

    for (let attempt = 0; attempt < 5; attempt += 1) {
      await vi.advanceTimersByTimeAsync(2000);
    }

    await rejection;
    expect(httpService.axiosRef.get).toHaveBeenCalledTimes(6);
  });
});

async function collectMessages(stream: AsyncIterable<AgentMessage>): Promise<AgentMessage[]> {
  const messages: AgentMessage[] = [];

  for await (const message of stream) {
    messages.push(message);
  }

  return messages;
}