import { parseDiffOutput, countDiffStats } from '../../src/utils/diff-utils';

describe('parseDiffOutput', () => {
  it('should parse empty diff', () => {
    const result = parseDiffOutput('');
    expect(result).toEqual([]);
  });

  it('should parse diff with one file', () => {
    const diffOutput = `diff --git a/test.ts b/test.ts
index 1234567..89abcdef 100644
--- a/test.ts
+++ b/test.ts
@@ -1,3 +1,4 @@
+import { useState } from 'react';
 function App() {
   return <div>Hello</div>;
 }
@@ -5,3 +6,4 @@ function App() {
   return <div>Hello</div>;
 }
+// comment
`;

    const result = parseDiffOutput(diffOutput);
    expect(result.length).toBe(1);
    expect(result[0].file).toBe('test.ts');
    expect(result[0].additions).toBe(2);
    expect(result[0].deletions).toBe(0);
  });

  it('should parse diff with multiple files', () => {
    const diffOutput = `diff --git a/file1.ts b/file1.ts
index 1234567..89abcdef 100644
--- a/file1.ts
+++ b/file1.ts
@@ -1,2 +1,3 @@
+const x = 1;
 line 1

diff --git a/file2.ts b/file2.ts
index abcdef1..2345678 100644
--- a/file2.ts
+++ b/file2.ts
@@ -1,2 +1,2 @@
-old line
+new line
 line 2
`;

    const result = parseDiffOutput(diffOutput);
    expect(result.length).toBe(2);
    expect(result[0].file).toBe('file1.ts');
    expect(result[1].file).toBe('file2.ts');
    expect(result[0].additions).toBe(1);
    expect(result[1].additions).toBe(1);
    expect(result[1].deletions).toBe(1);
  });
});

describe('countDiffStats', () => {
  it('should count additions and deletions', () => {
    const diffContent = `diff --git a/test.ts b/test.ts
@@ -1,3 +1,4 @@
+import { useState } from 'react';
 function App() {
   return <div>Hello</div>;
 }
@@ -5,3 +6,4 @@ function App() {
   return <div>Hello</div>;
 }
+// comment
`;

    const stats = countDiffStats(diffContent);
    expect(stats.additions).toBe(2);
    expect(stats.deletions).toBe(0);
    expect(stats.files).toBe(1);
  });

  it('should handle empty diff', () => {
    const stats = countDiffStats('');
    expect(stats.additions).toBe(0);
    expect(stats.deletions).toBe(0);
    expect(stats.files).toBe(1);
  });
});