import { describe, expect, it } from 'vitest';
import {
  clampCommentLines,
  extractValidLineRanges,
  isLineInDiff,
} from '../../../src/codeScan/util/diffLineRanges';

describe('extractValidLineRanges', () => {
  it('should handle empty diff', () => {
    expect(extractValidLineRanges('')).toEqual(new Map());
  });

  it('should extract ranges from single file with single hunk', () => {
    const diff = `diff --git a/src/foo.ts b/src/foo.ts
--- a/src/foo.ts
+++ b/src/foo.ts
@@ -10,7 +10,8 @@
   context line 1
   context line 2
-  removed line
+  added line 1
+  added line 2
   context line 3
   context line 4`;

    const ranges = extractValidLineRanges(diff);
    expect(ranges.get('src/foo.ts')).toEqual([{ start: 10, end: 15 }]);
  });

  it('should extract ranges from single file with multiple hunks (gap between)', () => {
    const diff = `diff --git a/src/foo.ts b/src/foo.ts
--- a/src/foo.ts
+++ b/src/foo.ts
@@ -10,5 +10,5 @@
   context
-  old
+  new
   context
   context
@@ -50,4 +50,5 @@
   more context
+  added
   even more
   end`;

    const ranges = extractValidLineRanges(diff);
    const fileRanges = ranges.get('src/foo.ts');

    expect(fileRanges).toHaveLength(2);
    expect(fileRanges![0]).toEqual({ start: 10, end: 13 });
    expect(fileRanges![1]).toEqual({ start: 50, end: 53 });
  });

  it('should extract ranges from multiple files', () => {
    const diff = `diff --git a/src/a.ts b/src/a.ts
--- a/src/a.ts
+++ b/src/a.ts
@@ -1,3 +1,4 @@
 line 1
+added
 line 2
 line 3
diff --git a/src/b.ts b/src/b.ts
--- a/src/b.ts
+++ b/src/b.ts
@@ -5,2 +5,3 @@
 line 5
+added
 line 6`;

    const ranges = extractValidLineRanges(diff);

    expect(ranges.get('src/a.ts')).toEqual([{ start: 1, end: 4 }]);
    expect(ranges.get('src/b.ts')).toEqual([{ start: 5, end: 7 }]);
  });

  it('should handle new file (all additions)', () => {
    const diff = `diff --git a/src/new.ts b/src/new.ts
new file mode 100644
--- /dev/null
+++ b/src/new.ts
@@ -0,0 +1,5 @@
+line 1
+line 2
+line 3
+line 4
+line 5`;

    const ranges = extractValidLineRanges(diff);
    expect(ranges.get('src/new.ts')).toEqual([{ start: 1, end: 5 }]);
  });

  it('should handle deleted file (no valid ranges)', () => {
    const diff = `diff --git a/src/deleted.ts b/src/deleted.ts
deleted file mode 100644
--- a/src/deleted.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-line 1
-line 2
-line 3`;

    const ranges = extractValidLineRanges(diff);
    expect(ranges.has('src/deleted.ts')).toBe(false);
  });
});

describe('clampCommentLines', () => {
  const ranges = new Map([
    [
      'src/foo.ts',
      [
        { start: 10, end: 20 },
        { start: 50, end: 60 },
      ],
    ],
  ]);

  it('should return line unchanged if valid (single-line)', () => {
    expect(clampCommentLines('src/foo.ts', null, 15, ranges)).toEqual({
      startLine: null,
      line: 15,
    });
  });

  it('should clamp single-line comment in gap to end of previous hunk', () => {
    expect(clampCommentLines('src/foo.ts', null, 30, ranges)).toEqual({
      startLine: null,
      line: 20,
    });
  });

  it('should return both lines unchanged if valid (multi-line)', () => {
    expect(clampCommentLines('src/foo.ts', 12, 18, ranges)).toEqual({
      startLine: 12,
      line: 18,
    });
  });

  it('should clamp end line if it extends into gap', () => {
    // Start at 15 (valid), end at 25 (in gap) -> clamp end to 20
    expect(clampCommentLines('src/foo.ts', 15, 25, ranges)).toEqual({
      startLine: 15,
      line: 20,
    });
  });

  it('should return null for unknown file', () => {
    expect(clampCommentLines('src/unknown.ts', 10, 20, ranges)).toBeNull();
  });

  it('should return null for null endLine', () => {
    expect(clampCommentLines('src/foo.ts', 10, null, ranges)).toBeNull();
  });
});

describe('integration: ENG-1309 scenario', () => {
  it('should clamp comment that extends into gap between hunks', () => {
    // Based on the actual PR that triggered ENG-1309
    const diff = `diff --git a/example-app/src/tools/index.ts b/example-app/src/tools/index.ts
--- a/example-app/src/tools/index.ts
+++ b/example-app/src/tools/index.ts
@@ -53,7 +53,7 @@ export function executeTool(toolCall: ToolCall, userContext: UserContext): ToolR
         // Secure level: always use authenticated user's role as user_id
         userId = userContext.role;
       } else {
-        // Insecure level: allow any user_id (no access control)
+        // Insecure/Medium level: allow any user_id (no access control)
         const providedUserId = args.user_id as string | undefined;
         userId = providedUserId === 'current' || providedUserId === 'me' || !providedUserId
           ? userContext.role
@@ -68,7 +68,7 @@ export function executeTool(toolCall: ToolCall, userContext: UserContext): ToolR
         // Secure level: always use authenticated user's role as user_id
         userId = userContext.role;
       } else {
-        // Insecure level: allow any user_id (no access control)
+        // Insecure/Medium level: allow any user_id (no access control)
         const providedUserId = args.user_id as string | undefined;`;

    const ranges = extractValidLineRanges(diff);

    // Agent tried to comment on lines 56-62, but line 62 is in the gap (59-68)
    const result = clampCommentLines('example-app/src/tools/index.ts', 56, 62, ranges);

    expect(result).toEqual({
      startLine: 56,
      line: 59, // clamped from 62 to end of first hunk
    });

    // Verify the gap detection
    expect(isLineInDiff('example-app/src/tools/index.ts', 59, ranges)).toBe(true);
    expect(isLineInDiff('example-app/src/tools/index.ts', 62, ranges)).toBe(false);
  });
});