/**
 * Integration tests for the sharpening tool.
 *
 * Tests all three sharpening methods (adaptive, unsharp-mask, high-pass),
 * custom parameters, denoise option, and format support.
 */

import { readFileSync } from "node:fs";
import { join } from "node:path";
import sharp from "sharp";
import { afterAll, beforeAll, describe, expect, it } from "vitest";
import { buildTestApp, createMultipartPayload, loginAsAdmin, type TestApp } from "./test-server.js";

const FIXTURES = join(__dirname, "..", "fixtures");
const PNG = readFileSync(join(FIXTURES, "test-200x150.png"));
const JPG = readFileSync(join(FIXTURES, "test-100x100.jpg"));
const WEBP = readFileSync(join(FIXTURES, "test-50x50.webp"));

let testApp: TestApp;
let app: TestApp["app"];
let adminToken: string;

beforeAll(async () => {
  testApp = await buildTestApp();
  app = testApp.app;
  adminToken = await loginAsAdmin(app);
}, 30_000);

afterAll(async () => {
  await testApp.cleanup();
}, 10_000);

function makePayload(
  settings: Record<string, unknown>,
  buffer: Buffer = PNG,
  filename = "test.png",
  contentType = "image/png",
) {
  return createMultipartPayload([
    { name: "file", filename, contentType, content: buffer },
    { name: "settings", content: JSON.stringify(settings) },
  ]);
}

async function postTool(
  settings: Record<string, unknown>,
  buffer?: Buffer,
  filename?: string,
  ct?: string,
) {
  const { body: payload, contentType } = makePayload(settings, buffer, filename, ct);
  return app.inject({
    method: "POST",
    url: "/api/v1/tools/sharpening",
    payload,
    headers: {
      "content-type": contentType,
      authorization: `Bearer ${adminToken}`,
    },
  });
}

// ── Adaptive method (default) ─────────────────────────────────────
describe("Adaptive sharpening", () => {
  it("sharpens with default settings", async () => {
    const res = await postTool({});
    expect(res.statusCode).toBe(200);
    const result = JSON.parse(res.body);
    expect(result.downloadUrl).toBeDefined();
    expect(result.processedSize).toBeGreaterThan(0);
  });

  it("sharpens with custom sigma", async () => {
    const res = await postTool({ method: "adaptive", sigma: 3.0 });
    expect(res.statusCode).toBe(200);
    const result = JSON.parse(res.body);
    expect(result.downloadUrl).toBeDefined();
  });

  it("sharpens with all adaptive parameters", async () => {
    const res = await postTool({
      method: "adaptive",
      sigma: 2.0,
      m1: 2.0,
      m2: 5.0,
      x1: 3.0,
      y2: 15,
      y3: 25,
    });
    expect(res.statusCode).toBe(200);
    const result = JSON.parse(res.body);
    expect(result.downloadUrl).toBeDefined();
  });
});

// ── Unsharp mask method ───────────────────────────────────────────
describe("Unsharp mask sharpening", () => {
  it("sharpens with unsharp-mask method", async () => {
    const res = await postTool({ method: "unsharp-mask" });
    expect(res.statusCode).toBe(200);
    const result = JSON.parse(res.body);
    expect(result.downloadUrl).toBeDefined();
  });

  it("sharpens with custom amount and radius", async () => {
    const res = await postTool({
      method: "unsharp-mask",
      amount: 200,
      radius: 2.5,
      threshold: 10,
    });
    expect(res.statusCode).toBe(200);
    const result = JSON.parse(res.body);
    expect(result.downloadUrl).toBeDefined();
  });
});

// ── High-pass method ──────────────────────────────────────────────
describe("High-pass sharpening", () => {
  it("sharpens with high-pass method", async () => {
    const res = await postTool({ method: "high-pass" });
    expect(res.statusCode).toBe(200);
    const result = JSON.parse(res.body);
    expect(result.downloadUrl).toBeDefined();
  });

  it("sharpens with custom strength and kernel size 5", async () => {
    const res = await postTool({ method: "high-pass", strength: 80, kernelSize: 5 });
    expect(res.statusCode).toBe(200);
    const result = JSON.parse(res.body);
    expect(result.downloadUrl).toBeDefined();
  });
});

// ── Denoise option ────────────────────────────────────────────────
describe("Denoise option", () => {
  it("applies light denoise", async () => {
    const res = await postTool({ denoise: "light" });
    expect(res.statusCode).toBe(200);
  });

  it("applies medium denoise", async () => {
    const res = await postTool({ denoise: "medium" });
    expect(res.statusCode).toBe(200);
  });

  it("applies strong denoise", async () => {
    const res = await postTool({ denoise: "strong" });
    expect(res.statusCode).toBe(200);
  });
});

// ── Output verification ──────────────────────────────────────────
describe("Output verification", () => {
  it("output differs from input (sharpening changes data)", async () => {
    const res = await postTool({ method: "adaptive", sigma: 5.0 });
    expect(res.statusCode).toBe(200);
    const result = JSON.parse(res.body);

    const dlRes = await app.inject({
      method: "GET",
      url: result.downloadUrl,
      headers: { authorization: `Bearer ${adminToken}` },
    });
    expect(dlRes.statusCode).toBe(200);

    // Sharpened output should not be identical to input
    expect(Buffer.compare(dlRes.rawPayload, PNG)).not.toBe(0);
  });

  it("preserves image dimensions", async () => {
    const res = await postTool({ method: "unsharp-mask", amount: 300 });
    expect(res.statusCode).toBe(200);
    const result = JSON.parse(res.body);

    const dlRes = await app.inject({
      method: "GET",
      url: result.downloadUrl,
      headers: { authorization: `Bearer ${adminToken}` },
    });
    const meta = await sharp(dlRes.rawPayload).metadata();
    expect(meta.width).toBe(200);
    expect(meta.height).toBe(150);
  });
});

// ── Format support ────────────────────────────────────────────────
describe("Multiple input formats", () => {
  it("processes JPEG input", async () => {
    const res = await postTool({ method: "adaptive" }, JPG, "test.jpg", "image/jpeg");
    expect(res.statusCode).toBe(200);
    const result = JSON.parse(res.body);
    expect(result.downloadUrl).toBeDefined();
  });

  it("processes WebP input", async () => {
    const res = await postTool({ method: "adaptive" }, WEBP, "test.webp", "image/webp");
    expect(res.statusCode).toBe(200);
    const result = JSON.parse(res.body);
    expect(result.downloadUrl).toBeDefined();
  });
});

// ── Error handling ────────────────────────────────────────────────
describe("Error handling", () => {
  it("returns 400 when no file is provided", async () => {
    const { body: payload, contentType } = createMultipartPayload([
      { name: "settings", content: JSON.stringify({ method: "adaptive" }) },
    ]);
    const res = await app.inject({
      method: "POST",
      url: "/api/v1/tools/sharpening",
      payload,
      headers: {
        "content-type": contentType,
        authorization: `Bearer ${adminToken}`,
      },
    });
    expect(res.statusCode).toBe(400);
  });

  it("returns 400 for invalid method", async () => {
    const res = await postTool({ method: "gaussian" });
    expect(res.statusCode).toBe(400);
  });

  it("returns 400 for sigma out of range (too low)", async () => {
    const res = await postTool({ sigma: 0.1 });
    expect(res.statusCode).toBe(400);
  });

  it("returns 400 for sigma out of range (too high)", async () => {
    const res = await postTool({ sigma: 50 });
    expect(res.statusCode).toBe(400);
  });

  it("returns 400 for invalid kernelSize", async () => {
    const res = await postTool({ method: "high-pass", kernelSize: 7 });
    expect(res.statusCode).toBe(400);
  });

  it("returns 400 for invalid denoise value", async () => {
    const res = await postTool({ denoise: "extreme" });
    expect(res.statusCode).toBe(400);
  });
});