import { describe, expect, it } from "vitest";
import {
  extractAttachmentRefs,
  extractImageRefs,
  fileKindForAttachment,
  fileKindForName,
  formatFileSize,
  hydrateAttachmentRefs,
  isImageAttachment,
  isImageFilename,
  stripStandaloneImageEmbeds,
} from "./task-chat-attachments";

describe("fileKindForName", () => {
  it("maps known extensions to kind labels", () => {
    expect(fileKindForName("report.pdf").label).toBe("PDF");
    expect(fileKindForName("data.csv").label).toBe("CSV");
    expect(fileKindForName("bundle.zip").label).toBe("ZIP");
    expect(fileKindForName("script.ts").label).toBe("Code");
  });

  it("falls back to File for unknown or missing extensions", () => {
    expect(fileKindForName("mystery.xyz").label).toBe("File");
    expect(fileKindForName("README").label).toBe("File");
  });
});

describe("isImageFilename", () => {
  it("detects image extensions case-insensitively", () => {
    expect(isImageFilename("shot.PNG")).toBe(true);
    expect(isImageFilename("photo.jpeg")).toBe(true);
    expect(isImageFilename("notes.txt")).toBe(false);
  });
});

describe("attachment record metadata", () => {
  it("detects an extensionless image from its content type", () => {
    expect(
      isImageAttachment({
        name: "desktop Default",
        url: "/api/attachments/screenshot/content",
        contentType: "image/png",
      }),
    ).toBe(true);
  });

  it("falls back to the extension for generic attachment content", () => {
    expect(
      isImageAttachment({
        name: "shot.png",
        url: "/api/attachments/screenshot/content",
        contentType: "application/octet-stream",
      }),
    ).toBe(true);
  });

  it("uses content type for an extensionless file kind", () => {
    expect(
      fileKindForAttachment({
        name: "report",
        url: "/api/attachments/report/content",
        contentType: "application/pdf",
      }).label,
    ).toBe("PDF");
  });

  it("hydrates refs with the stored type, size, and paths", () => {
    const [ref] = hydrateAttachmentRefs(
      [{ name: "desktop Default", url: "/api/attachments/a1/content" }],
      [
        {
          id: "a1",
          contentPath: "/api/attachments/a1/content",
          openPath: "/api/attachments/a1/content",
          downloadPath: "/api/attachments/a1/content?download=1",
          contentType: "image/png",
          byteSize: 2048,
          originalFilename: "desktop Default",
        },
      ],
    );
    expect(ref).toMatchObject({
      id: "a1",
      contentType: "image/png",
      byteSize: 2048,
    });
  });
});

describe("formatFileSize", () => {
  it("formats byte tiers", () => {
    expect(formatFileSize(512)).toBe("512 B");
    expect(formatFileSize(2048)).toBe("2.0 KB");
    expect(formatFileSize(3 * 1024 * 1024)).toBe("3.0 MB");
  });

  it("returns empty for missing or non-positive sizes", () => {
    expect(formatFileSize(undefined)).toBe("");
    expect(formatFileSize(0)).toBe("");
  });
});

describe("extractAttachmentRefs", () => {
  it("extracts attachment links and strips link-only lines", () => {
    const body = "Here are the notes.\n\n[notes.txt](/api/attachments/abc/content) ";
    const { refs, text } = extractAttachmentRefs(body);
    expect(refs).toEqual([{ name: "notes.txt", url: "/api/attachments/abc/content" }]);
    expect(text).toBe("Here are the notes.");
  });

  it("keeps links woven into prose while still chipping them", () => {
    const body = "See [report.pdf](/api/attachments/r1/content) for details.";
    const { refs, text } = extractAttachmentRefs(body);
    expect(refs).toEqual([{ name: "report.pdf", url: "/api/attachments/r1/content" }]);
    expect(text).toBe(body);
  });

  it("ignores image embeds but returns image-named attachment links for classification", () => {
    const body =
      "![shot.png](/api/attachments/img/content)\n[photo.jpg](/api/attachments/p/content)\n[notes.txt](/api/attachments/n/content)";
    const { refs } = extractAttachmentRefs(body);
    expect(refs).toEqual([
      { name: "photo.jpg", url: "/api/attachments/p/content" },
      { name: "notes.txt", url: "/api/attachments/n/content" },
    ]);
  });

  it("ignores non-attachment links entirely", () => {
    const body = "[docs](https://example.com/content) and [PAP-1](/issues/PAP-1)";
    const { refs, text } = extractAttachmentRefs(body);
    expect(refs).toEqual([]);
    expect(text).toBe(body);
  });

  it("dedupes repeated references to the same attachment", () => {
    const body =
      "[notes.txt](/api/attachments/n/content)\n[notes.txt](/api/attachments/n/content)";
    const { refs, text } = extractAttachmentRefs(body);
    expect(refs).toHaveLength(1);
    expect(text).toBe("");
  });

  it("unescapes bracket-escaped labels and accepts asset content paths", () => {
    const body = String.raw`[weird \[name\].txt](/api/assets/a1/content?download=1)`;
    const { refs } = extractAttachmentRefs(body);
    expect(refs).toEqual([
      { name: "weird [name].txt", url: "/api/assets/a1/content?download=1" },
    ]);
  });
});

describe("extractImageRefs", () => {
  it("collects image embeds in order, skipping plain links", () => {
    const body =
      "![a.png](/api/attachments/a/content)\nSee [notes.txt](/api/attachments/n/content)\n![b.jpg](https://example.com/b.jpg)";
    expect(extractImageRefs(body)).toEqual([
      { name: "a.png", url: "/api/attachments/a/content" },
      { name: "b.jpg", url: "https://example.com/b.jpg" },
    ]);
  });

  it("dedupes repeated embeds and tolerates empty alt text", () => {
    const body = "![](/api/attachments/a/content)\n![again](/api/attachments/a/content)";
    expect(extractImageRefs(body)).toEqual([{ name: "", url: "/api/attachments/a/content" }]);
  });

  it("unescapes bracket-escaped alt text", () => {
    const body = String.raw`![shot \[1\].png](/api/attachments/s/content)`;
    expect(extractImageRefs(body)).toEqual([
      { name: "shot [1].png", url: "/api/attachments/s/content" },
    ]);
  });

  it("returns nothing for bodies without images", () => {
    expect(extractImageRefs("just text and a [link](/api/attachments/x/content)")).toEqual([]);
  });

  it("promotes standalone embeds but leaves prose-woven embeds inline", () => {
    const body = [
      "Standalone embed on its own line:",
      "",
      "![shot one](/api/attachments/a/content)",
      "",
      "And here is an image ![inline two](/api/attachments/b/content) woven into this sentence.",
    ].join("\n");

    expect(extractImageRefs(body)).toEqual([
      { name: "shot one", url: "/api/attachments/a/content" },
    ]);
    expect(stripStandaloneImageEmbeds(body)).toBe(
      [
        "Standalone embed on its own line:",
        "",
        "And here is an image ![inline two](/api/attachments/b/content) woven into this sentence.",
      ].join("\n"),
    );
  });
});

describe("stripStandaloneImageEmbeds", () => {
  it("removes tail embeds promoted to thumbnails but keeps prose", () => {
    expect(
      stripStandaloneImageEmbeds("Done.\n\n![desktop Default](/api/attachments/a/content)"),
    ).toBe("Done.");
  });
});