import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";

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

import { loadWebMedia } from "./media.js";

const tmpFiles: string[] = [];

afterEach(async () => {
  await Promise.all(tmpFiles.map((file) => fs.rm(file, { force: true })));
  tmpFiles.length = 0;
});

describe("web media loading", () => {
  it("compresses large local images under the provided cap", async () => {
    const buffer = await sharp({
      create: {
        width: 1600,
        height: 1600,
        channels: 3,
        background: "#ff0000",
      },
    })
      .jpeg({ quality: 95 })
      .toBuffer();

    const file = path.join(os.tmpdir(), `clawdbot-media-${Date.now()}.jpg`);
    tmpFiles.push(file);
    await fs.writeFile(file, buffer);

    const cap = Math.floor(buffer.length * 0.8);
    const result = await loadWebMedia(file, cap);

    expect(result.kind).toBe("image");
    expect(result.buffer.length).toBeLessThanOrEqual(cap);
    expect(result.buffer.length).toBeLessThan(buffer.length);
  });

  it("sniffs mime before extension when loading local files", async () => {
    const pngBuffer = await sharp({
      create: { width: 2, height: 2, channels: 3, background: "#00ff00" },
    })
      .png()
      .toBuffer();
    const wrongExt = path.join(os.tmpdir(), `clawdbot-media-${Date.now()}.bin`);
    tmpFiles.push(wrongExt);
    await fs.writeFile(wrongExt, pngBuffer);

    const result = await loadWebMedia(wrongExt, 1024 * 1024);

    expect(result.kind).toBe("image");
    expect(result.contentType).toBe("image/jpeg");
  });

  it("adds extension to URL fileName when missing", async () => {
    const fetchMock = vi.spyOn(globalThis, "fetch").mockResolvedValueOnce({
      ok: true,
      body: true,
      arrayBuffer: async () => Buffer.from("%PDF-1.4").buffer,
      headers: { get: () => "application/pdf" },
      status: 200,
    } as Response);

    const result = await loadWebMedia(
      "https://example.com/download",
      1024 * 1024,
    );

    expect(result.kind).toBe("document");
    expect(result.contentType).toBe("application/pdf");
    expect(result.fileName).toBe("download.pdf");

    fetchMock.mockRestore();
  });

  it("includes URL + status in fetch errors", async () => {
    const fetchMock = vi.spyOn(globalThis, "fetch").mockResolvedValueOnce({
      ok: false,
      body: true,
      text: async () => "Not Found",
      headers: { get: () => null },
      status: 404,
      statusText: "Not Found",
      url: "https://example.com/missing.jpg",
    } as Response);

    await expect(
      loadWebMedia("https://example.com/missing.jpg", 1024 * 1024),
    ).rejects.toThrow(
      /Failed to fetch media from https:\/\/example\.com\/missing\.jpg.*HTTP 404/i,
    );

    fetchMock.mockRestore();
  });

  it("uses content-disposition filename when available", async () => {
    const fetchMock = vi.spyOn(globalThis, "fetch").mockResolvedValueOnce({
      ok: true,
      body: true,
      arrayBuffer: async () => Buffer.from("%PDF-1.4").buffer,
      headers: {
        get: (name: string) => {
          if (name === "content-disposition") {
            return 'attachment; filename="report.pdf"';
          }
          if (name === "content-type") return "application/pdf";
          return null;
        },
      },
      status: 200,
    } as Response);

    const result = await loadWebMedia(
      "https://example.com/download?id=1",
      1024 * 1024,
    );

    expect(result.kind).toBe("document");
    expect(result.fileName).toBe("report.pdf");

    fetchMock.mockRestore();
  });

  it("preserves GIF animation by skipping JPEG optimization", async () => {
    // Create a minimal valid GIF (1x1 pixel)
    // GIF89a header + minimal image data
    const gifBuffer = Buffer.from([
      0x47,
      0x49,
      0x46,
      0x38,
      0x39,
      0x61, // GIF89a
      0x01,
      0x00,
      0x01,
      0x00, // 1x1 dimensions
      0x00,
      0x00,
      0x00, // no global color table
      0x2c,
      0x00,
      0x00,
      0x00,
      0x00, // image descriptor
      0x01,
      0x00,
      0x01,
      0x00,
      0x00, // 1x1 image
      0x02,
      0x01,
      0x44,
      0x00,
      0x3b, // minimal LZW data + trailer
    ]);

    const file = path.join(os.tmpdir(), `clawdbot-media-${Date.now()}.gif`);
    tmpFiles.push(file);
    await fs.writeFile(file, gifBuffer);

    const result = await loadWebMedia(file, 1024 * 1024);

    expect(result.kind).toBe("image");
    expect(result.contentType).toBe("image/gif");
    // GIF should NOT be converted to JPEG
    expect(result.buffer.slice(0, 3).toString()).toBe("GIF");
  });

  it("preserves GIF from URL without JPEG conversion", async () => {
    const gifBytes = new Uint8Array([
      0x47, 0x49, 0x46, 0x38, 0x39, 0x61, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00,
      0x00, 0x2c, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x02,
      0x01, 0x44, 0x00, 0x3b,
    ]);

    const fetchMock = vi.spyOn(globalThis, "fetch").mockResolvedValueOnce({
      ok: true,
      body: true,
      arrayBuffer: async () =>
        gifBytes.buffer.slice(
          gifBytes.byteOffset,
          gifBytes.byteOffset + gifBytes.byteLength,
        ),
      headers: { get: () => "image/gif" },
      status: 200,
    } as Response);

    const result = await loadWebMedia(
      "https://example.com/animation.gif",
      1024 * 1024,
    );

    expect(result.kind).toBe("image");
    expect(result.contentType).toBe("image/gif");
    expect(result.buffer.slice(0, 3).toString()).toBe("GIF");

    fetchMock.mockRestore();
  });
});