import { afterEach, describe, expect, it, vi } from "vitest";
import {
  uploadFile,
  type UploadProgress,
  type UploadTransport,
} from "../src/react/index.js";

class FakeUploadTarget {
  onprogress: ((event: ProgressEvent) => void) | null = null;
}

class FakeXMLHttpRequest {
  static latest: FakeXMLHttpRequest | undefined;
  readonly upload = new FakeUploadTarget();
  readonly headers: Record<string, string> = {};
  status = 0;
  method = "";
  url = "";
  body: unknown;
  onload: (() => void) | null = null;
  onerror: (() => void) | null = null;
  onabort: (() => void) | null = null;

  constructor() {
    FakeXMLHttpRequest.latest = this;
  }

  open(method: string, url: string): void {
    this.method = method;
    this.url = url;
  }

  setRequestHeader(name: string, value: string): void {
    this.headers[name.toLowerCase()] = value;
  }

  send(body: unknown): void {
    this.body = body;
    const size = (body as { size?: number }).size ?? 0;
    this.upload.onprogress?.({ loaded: size } as ProgressEvent);
    this.status = 200;
    this.onload?.();
  }

  abort(): void {
    this.onabort?.();
  }
}

describe("direct React upload helper", () => {
  const original = globalThis.XMLHttpRequest;

  afterEach(() => {
    globalThis.XMLHttpRequest = original;
    FakeXMLHttpRequest.latest = undefined;
  });

  it("PUTs the file to object storage, reports progress, then completes", async () => {
    globalThis.XMLHttpRequest = FakeXMLHttpRequest as unknown as typeof XMLHttpRequest;
    const file = { name: "photo.png", type: "image/png", size: 4 } as File;
    const progress: UploadProgress[] = [];
    const transport: UploadTransport = {
      createUpload: vi.fn().mockResolvedValue({
        id: "upl_1",
        uploadUrl: "https://objects.example/signed-put",
        method: "PUT",
        requiredHeaders: { "content-type": "image/png", "if-none-match": "*" },
        expiresAt: "2026-07-15T00:10:00.000Z",
      }),
      completeUpload: vi.fn().mockResolvedValue({
        id: "ast_1",
        publicId: "file_1",
        url: "https://stuffbox.example/f/file_1",
        filename: "photo.png",
        mimeType: "image/png",
        byteSize: 4,
        status: "active",
        createdAt: "2026-07-15T00:00:00.000Z",
      }),
    };

    const asset = await uploadFile(transport, file, {
      onProgress: (value) => progress.push(value),
    });

    expect(asset.id).toBe("ast_1");
    expect(transport.createUpload).toHaveBeenCalledWith(
      { filename: "photo.png", mimeType: "image/png", size: 4 },
      {},
    );
    expect(FakeXMLHttpRequest.latest).toMatchObject({
      method: "PUT",
      url: "https://objects.example/signed-put",
      body: file,
      headers: { "content-type": "image/png", "if-none-match": "*" },
    });
    expect(transport.completeUpload).toHaveBeenCalledWith("upl_1", undefined, {});
    expect(progress.map((value) => value.phase)).toEqual([
      "creating",
      "uploading",
      "uploading",
      "uploading",
      "completing",
      "complete",
    ]);
    expect(progress.at(-1)?.percent).toBe(100);
  });
});