import { describe, it, expect } from "vitest";

// Mirror pure logic functions from MemoryBrowserPanel.svelte

interface MemoryFileInfo {
  path: string;
  heading: string | null;
}

function getFileName(path: string): string {
  return path.split("/").pop() || path;
}

function getDisplayName(file: MemoryFileInfo): string {
  return file.heading ?? getFileName(file.path);
}

describe("getFileName", () => {
  it("extracts the filename from an absolute Unix path", () => {
    expect(getFileName("/home/naomi/.claude/projects/foo/memory/MEMORY.md")).toBe("MEMORY.md");
  });

  it("extracts the filename from a nested path", () => {
    expect(getFileName("/home/naomi/.claude/projects/foo/memory/debugging.md")).toBe(
      "debugging.md"
    );
  });

  it("returns the path itself when there is no slash", () => {
    expect(getFileName("MEMORY.md")).toBe("MEMORY.md");
  });

  it("returns the path when the path ends with a slash (empty filename)", () => {
    // split('/').pop() returns '' for trailing slash → falls back to full path
    expect(getFileName("/some/dir/")).toBe("/some/dir/");
  });

  it("handles single-component paths", () => {
    expect(getFileName("notes.md")).toBe("notes.md");
  });

  it("handles Windows-style paths passed as Unix strings", () => {
    // If the path contains no forward slashes, the whole string is the filename
    expect(getFileName("C:\\Users\\naomi\\memory\\file.md")).toBe(
      "C:\\Users\\naomi\\memory\\file.md"
    );
  });
});

describe("getDisplayName", () => {
  it("returns the heading when the file has one", () => {
    const file: MemoryFileInfo = {
      path: "/home/naomi/.claude/projects/foo/memory/MEMORY.md",
      heading: "Hikari Desktop - Memory",
    };
    expect(getDisplayName(file)).toBe("Hikari Desktop - Memory");
  });

  it("falls back to the filename when heading is null", () => {
    const file: MemoryFileInfo = {
      path: "/home/naomi/.claude/projects/foo/memory/debugging.md",
      heading: null,
    };
    expect(getDisplayName(file)).toBe("debugging.md");
  });

  it("falls back to the filename when heading is an empty string stored as null", () => {
    const file: MemoryFileInfo = {
      path: "/home/naomi/.claude/projects/foo/memory/patterns.md",
      heading: null,
    };
    expect(getDisplayName(file)).toBe("patterns.md");
  });

  it("returns the heading even when it matches the filename", () => {
    const file: MemoryFileInfo = {
      path: "/home/naomi/.claude/projects/foo/memory/MEMORY.md",
      heading: "MEMORY",
    };
    expect(getDisplayName(file)).toBe("MEMORY");
  });

  it("returns a multi-word heading verbatim", () => {
    const file: MemoryFileInfo = {
      path: "/some/path/foo.md",
      heading: "My Detailed Debugging Notes",
    };
    expect(getDisplayName(file)).toBe("My Detailed Debugging Notes");
  });

  it("falls back gracefully when path has no directory separators", () => {
    const file: MemoryFileInfo = {
      path: "lonely-file.md",
      heading: null,
    };
    expect(getDisplayName(file)).toBe("lonely-file.md");
  });
});