import { afterEach, describe, expect, it, vi } from "vitest";

import {
  createDiscordNotificationService,
  formatPairingMessage,
  type DiscordFetch
} from "../plugin/notifications/discord.js";

const request = {
  identifier: "client-a",
  pairingCode: "PAIR-1234-CODE",
  expiresAt: 1_710_000_300,
  ttlSeconds: 300,
  createdAt: 1_710_000_000
};

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

describe("Discord notification service", () => {
  it("formats pairing requests as a DM-friendly message", () => {
    const message = formatPairingMessage(request);

    expect(message).toContain("Yonexus Pairing Request");
    expect(message).toContain("`client-a`");
    expect(message).toContain("`PAIR-1234-CODE`");
    expect(message).toContain("TTL:** 300 seconds");
  });

  it("creates a DM channel and posts the pairing message", async () => {
    const fetcher = vi
      .fn<DiscordFetch>()
      .mockResolvedValueOnce({
        ok: true,
        status: 200,
        json: async () => ({ id: "dm-channel-1" })
      })
      .mockResolvedValueOnce({
        ok: true,
        status: 200,
        json: async () => ({ id: "message-1" })
      });

    const service = createDiscordNotificationService(
      {
        botToken: "discord-bot-token",
        adminUserId: "123456789012345678"
      },
      { fetcher }
    );

    await expect(service.sendPairingNotification(request)).resolves.toBe(true);
    expect(fetcher).toHaveBeenCalledTimes(2);
    expect(fetcher).toHaveBeenNthCalledWith(
      1,
      "https://discord.com/api/v10/users/@me/channels",
      expect.objectContaining({
        method: "POST",
        headers: expect.objectContaining({
          Authorization: "Bot discord-bot-token"
        }),
        body: JSON.stringify({ recipient_id: "123456789012345678" })
      })
    );
    expect(fetcher).toHaveBeenNthCalledWith(
      2,
      "https://discord.com/api/v10/channels/dm-channel-1/messages",
      expect.objectContaining({
        method: "POST"
      })
    );
  });

  it("returns false when Discord rejects DM channel creation", async () => {
    const fetcher = vi.fn<DiscordFetch>().mockResolvedValueOnce({
      ok: false,
      status: 403,
      json: async () => ({ message: "Missing Access" })
    });

    const service = createDiscordNotificationService(
      {
        botToken: "discord-bot-token",
        adminUserId: "123456789012345678"
      },
      { fetcher }
    );

    await expect(service.sendPairingNotification(request)).resolves.toBe(false);
    expect(fetcher).toHaveBeenCalledTimes(1);
  });

  it("returns false when config is missing required Discord credentials", async () => {
    const fetcher = vi.fn<DiscordFetch>();
    const service = createDiscordNotificationService(
      {
        botToken: "",
        adminUserId: ""
      },
      { fetcher }
    );

    await expect(service.sendPairingNotification(request)).resolves.toBe(false);
    expect(fetcher).not.toHaveBeenCalled();
  });
});