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import { describe, expect, it } from "vitest";
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import { GRADIENT_PRESETS, isGradientPreset, parseUploadCoverUrl } from "@/shared/page-cover";
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import {
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  createSiteCoverHash,
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  isOgImageType,
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  parseGradient,
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  SITE_COVER_HEIGHT,
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  SITE_COVER_WIDTH,
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} from "@/worker/sites/cover";
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describe("Sites cover helpers", () => {
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  it("creates a stable hash that changes when cover inputs change", async () => {
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    const first = await createSiteCoverHash(GRADIENT_PRESETS[0]);
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    const repeat = await createSiteCoverHash(GRADIENT_PRESETS[0]);
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    const changed = await createSiteCoverHash(GRADIENT_PRESETS[1]);
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    expect(first).toBe(repeat);
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    expect(first).not.toBe(changed);
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    expect(first).toMatch(/^[A-Za-z0-9_-]+$/);
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  });
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  it("parses only exact upload cover URLs", () => {
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    expect(parseUploadCoverUrl("/uploads/upload_abc-123")).toBe("upload_abc-123");
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    expect(parseUploadCoverUrl("/uploads/")).toBeNull();
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    expect(parseUploadCoverUrl("/uploads/abc/extra")).toBeNull();
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    expect(parseUploadCoverUrl("https://example.com/uploads/abc")).toBeNull();
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  });
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  it("classifies only OG-safe upload content types", () => {
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    expect(isOgImageType("image/png")).toBe(true);
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    expect(isOgImageType("image/jpeg; charset=binary")).toBe(true);
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    expect(isOgImageType("image/webp")).toBe(true);
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    expect(isOgImageType("image/gif")).toBe(true);
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    expect(isOgImageType("image/heic")).toBe(false);
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    expect(isOgImageType("application/pdf")).toBe(false);
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  });
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  it("parses every shared gradient preset", () => {
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    for (const preset of GRADIENT_PRESETS) {
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      const parsed = parseGradient(preset);
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      expect(isGradientPreset(preset)).toBe(true);
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      expect(parsed?.stops.length).toBeGreaterThanOrEqual(2);
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      expect(parsed?.stops[0].position).toBeGreaterThanOrEqual(0);
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      expect(parsed?.stops.at(-1)?.position).toBeLessThanOrEqual(100);
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    }
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  });
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  it("rejects unsupported gradient CSS and clamps explicit stop positions", () => {
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    expect(parseGradient("radial-gradient(#000 0%, #fff 100%)")).toBeNull();
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    expect(parseGradient("linear-gradient(to right, #000 0%, #fff 100%)")).toBeNull();
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    expect(parseGradient("linear-gradient(90deg, red 0%, blue 100%)")).toBeNull();
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    expect(parseGradient("linear-gradient(90deg, #000, #fff)")).toBeNull();
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    const parsed = parseGradient("linear-gradient(90deg, #000 -10%, #ffffff 110%)");
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    expect(parsed?.stops.map((stop) => stop.position)).toEqual([0, 100]);
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  });
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  it("keeps generated cover dimensions fixed", () => {
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    expect(SITE_COVER_WIDTH).toBe(1200);
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    expect(SITE_COVER_HEIGHT).toBe(630);
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  });
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});