import { describe, expect, it } from "vitest";
import {
  computeThumbnailStrip,
  encodePreviewPath,
  resolveMediaPreviewUrl,
  THUMBNAIL_CLIP_HEIGHT,
} from "./thumbnailUtils";

describe("computeThumbnailStrip", () => {
  it("sizes tiles by aspect ratio at the clip height", () => {
    const { frameW } = computeThumbnailStrip(500, 16 / 9);
    expect(frameW).toBe(Math.round(THUMBNAIL_CLIP_HEIGHT * (16 / 9)));
  });

  it("repeats tiles to cover the container width", () => {
    const { frameW, frameCount } = computeThumbnailStrip(500, 1);
    expect(frameW).toBe(THUMBNAIL_CLIP_HEIGHT);
    expect(frameCount).toBe(Math.ceil(500 / THUMBNAIL_CLIP_HEIGHT));
    expect(frameCount * frameW).toBeGreaterThanOrEqual(500);
  });

  it("returns one tile when the container width is unknown", () => {
    expect(computeThumbnailStrip(0, 16 / 9).frameCount).toBe(1);
    expect(computeThumbnailStrip(-10, 16 / 9).frameCount).toBe(1);
  });

  it("falls back to 16:9 for degenerate aspects", () => {
    const expected = Math.round(THUMBNAIL_CLIP_HEIGHT * (16 / 9));
    expect(computeThumbnailStrip(300, 0).frameW).toBe(expected);
    expect(computeThumbnailStrip(300, -2).frameW).toBe(expected);
    expect(computeThumbnailStrip(300, Number.NaN).frameW).toBe(expected);
    expect(computeThumbnailStrip(300, Number.POSITIVE_INFINITY).frameW).toBe(expected);
  });

  it("never returns a zero-width tile (avoids divide-by-zero repeat counts)", () => {
    const { frameW, frameCount } = computeThumbnailStrip(300, 0.001);
    expect(frameW).toBeGreaterThanOrEqual(1);
    expect(Number.isFinite(frameCount)).toBe(true);
  });

  it("honors a custom clip height", () => {
    expect(computeThumbnailStrip(300, 2, 40).frameW).toBe(80);
  });
});

describe("resolveMediaPreviewUrl", () => {
  it("routes composition-relative paths through the project preview endpoint", () => {
    expect(resolveMediaPreviewUrl("assets/image.png", "proj-1")).toBe(
      "/api/projects/proj-1/preview/assets/image.png",
    );
  });

  it("passes absolute http(s) URLs through untouched", () => {
    expect(resolveMediaPreviewUrl("http://cdn.example.com/a.mp4", "proj-1")).toBe(
      "http://cdn.example.com/a.mp4",
    );
    expect(resolveMediaPreviewUrl("https://cdn.example.com/a.png", "proj-1")).toBe(
      "https://cdn.example.com/a.png",
    );
  });

  it("percent-encodes spaces in filenames", () => {
    expect(resolveMediaPreviewUrl("assets/my logo.png", "proj-1")).toBe(
      "/api/projects/proj-1/preview/assets/my%20logo.png",
    );
  });

  it("percent-encodes parentheses in filenames", () => {
    expect(resolveMediaPreviewUrl("assets/heygen-symbol-blue-logo (2).svg", "proj-1")).toBe(
      "/api/projects/proj-1/preview/assets/heygen-symbol-blue-logo%20(2).svg",
    );
  });

  it("preserves slashes as path separators while encoding each segment", () => {
    expect(resolveMediaPreviewUrl("sub dir/file (v2).mp4", "proj-2")).toBe(
      "/api/projects/proj-2/preview/sub%20dir/file%20(v2).mp4",
    );
  });

  it("percent-encodes unicode characters in filenames", () => {
    expect(resolveMediaPreviewUrl("assets/café logo.png", "proj-1")).toBe(
      "/api/projects/proj-1/preview/assets/caf%C3%A9%20logo.png",
    );
  });

  it("leaves paths with no special characters unchanged", () => {
    expect(resolveMediaPreviewUrl("assets/logo.svg", "proj-1")).toBe(
      "/api/projects/proj-1/preview/assets/logo.svg",
    );
  });

  it("percent-encodes a U+202F narrow no-break space (macOS screenshot artifact)", () => {
    // "Screenshot … 2.16.30 PM.png" — the char between the time and PM is a
    // narrow no-break space; it must encode to %E2%80%AF, not route raw (404).
    expect(resolveMediaPreviewUrl("assets/Screenshot 2.16.30 PM.png", "proj-1")).toBe(
      "/api/projects/proj-1/preview/assets/Screenshot%202.16.30%E2%80%AFPM.png",
    );
  });

  it("passes data: URIs through untouched (never routes them through preview → HTTP 431)", () => {
    const svg = "data:image/svg+xml;base64,PHN2Zz48L3N2Zz4=";
    expect(resolveMediaPreviewUrl(svg, "proj-1")).toBe(svg);
  });

  it("passes blob: URLs through untouched", () => {
    const blob = "blob:http://localhost:5190/2b3c-4d5e";
    expect(resolveMediaPreviewUrl(blob, "proj-1")).toBe(blob);
  });
});

// The shared encoder used by every timeline media-URL builder (filmstrip, audio
// waveform, sub-composition preview) — must match the assets panel's per-segment
// encoding so those paths stop 404ing on non-ASCII filenames.
describe("encodePreviewPath", () => {
  it("encodes spaces and parentheses per segment, preserving slashes", () => {
    expect(encodePreviewPath("sub dir/file (v2).mp3")).toBe("sub%20dir/file%20(v2).mp3");
  });

  it("encodes a U+202F narrow no-break space to %E2%80%AF", () => {
    expect(encodePreviewPath("assets/clip 2.mp3")).toBe("assets/clip%202.mp3");
    expect(encodePreviewPath(`assets/clip${" "}2.mp3`)).toBe("assets/clip%E2%80%AF2.mp3");
  });

  it("leaves a plain path unchanged", () => {
    expect(encodePreviewPath("assets/music.mp3")).toBe("assets/music.mp3");
  });
});