import { describe, it, expect } from "vitest";
import {
  isAdoptCandidate,
  matchesPendingHint,
  mergeFrontmatter,
  type PendingCreateHint,
} from "../../unresolvedLink/adoptHelpers";
import { TFile } from "obsidian";

describe("isAdoptCandidate", () => {
  it("returns true for empty content", () => {
    expect(isAdoptCandidate("", 200)).toBe(true);
    expect(isAdoptCandidate("   ", 200)).toBe(true);
  });

  it("returns true for content without frontmatter id", () => {
    expect(isAdoptCandidate("Some text", 200)).toBe(true);
    expect(isAdoptCandidate("Some text\nwith multiple lines", 200)).toBe(true);
  });

  it("returns true for content with frontmatter but no id", () => {
    const content = `---
title: Test
---
Body content`;
    expect(isAdoptCandidate(content, 200)).toBe(true);
  });

  it("returns false for content with id", () => {
    const content = `---
id: note_123
title: Test
---
Body`;
    expect(isAdoptCandidate(content, 200)).toBe(false);
  });

  it("returns false for content exceeding maxChars", () => {
    const longContent = "x".repeat(300);
    expect(isAdoptCandidate(longContent, 200)).toBe(false);
  });

  it("returns true for content within maxChars even with frontmatter", () => {
    const content = `---
title: Test
---
Short body`;
    expect(isAdoptCandidate(content, 200)).toBe(true);
  });
});

describe("matchesPendingHint", () => {
  it("returns true when basename matches and within time window", () => {
    const file = { basename: "test-note" } as TFile;
    const hint: PendingCreateHint = {
      basename: "test-note",
      sourcePath: "source.md",
      timestamp: Date.now() - 1000, // 1 second ago
    };
    expect(matchesPendingHint(file, hint, 3000)).toBe(true);
  });

  it("returns false when basename doesn't match", () => {
    const file = { basename: "other-note" } as TFile;
    const hint: PendingCreateHint = {
      basename: "test-note",
      sourcePath: "source.md",
      timestamp: Date.now() - 1000,
    };
    expect(matchesPendingHint(file, hint, 3000)).toBe(false);
  });

  it("returns false when time window exceeded", () => {
    const file = { basename: "test-note" } as TFile;
    const hint: PendingCreateHint = {
      basename: "test-note",
      sourcePath: "source.md",
      timestamp: Date.now() - 5000, // 5 seconds ago
    };
    expect(matchesPendingHint(file, hint, 3000)).toBe(false);
  });

  it("returns false when hint is null", () => {
    const file = { basename: "test-note" } as TFile;
    expect(matchesPendingHint(file, null, 3000)).toBe(false);
  });
});

describe("mergeFrontmatter", () => {
  it("prepends frontmatter to content without existing frontmatter", () => {
    const content = "Body content";
    const frontmatter = `---
id: note_123
title: Test
---`;
    const result = mergeFrontmatter(content, frontmatter);
    expect(result).toContain("id: note_123");
    expect(result).toContain("title: Test");
    expect(result).toContain("Body content");
  });

  it("merges with existing frontmatter preserving existing fields", () => {
    const content = `---
title: Existing
custom: value
---
Body content`;
    const frontmatter = `---
id: note_123
title: New
type: note
---`;
    const result = mergeFrontmatter(content, frontmatter);
    expect(result).toContain("id: note_123");
    expect(result).toContain("title: Existing"); // Existing takes precedence
    expect(result).toContain("type: note");
    expect(result).toContain("custom: value");
    expect(result).toContain("Body content");
  });

  it("preserves body content when merging", () => {
    const content = `---
title: Test
---
Line 1
Line 2
Line 3`;
    const frontmatter = `---
id: note_123
---`;
    const result = mergeFrontmatter(content, frontmatter);
    expect(result).toContain("Line 1");
    expect(result).toContain("Line 2");
    expect(result).toContain("Line 3");
  });

  it("handles empty body", () => {
    const content = `---
title: Test
---`;
    const frontmatter = `---
id: note_123
---`;
    const result = mergeFrontmatter(content, frontmatter);
    expect(result).toContain("id: note_123");
    expect(result).toContain("title: Test");
  });
});