import { describe, it, expect, beforeEach } from 'vitest';
import { parseStackTrace } from '../src/utils/stacktrace';

describe('stacktrace', () => {
  // Mock location for jsdom environment
  beforeEach(() => {
    delete (global as any).location;
  });

  describe('parseStackTrace', () => {
    it('should return empty array for undefined stack', () => {
      expect(parseStackTrace(undefined)).toEqual([]);
    });

    it('should return empty array for empty string', () => {
      expect(parseStackTrace('')).toEqual([]);
    });

    it('should parse standard Chrome/Node.js stack trace format', () => {
      // Stack trace: newest call first (Function1), then Function2, then Function3
      // After reverse, order becomes Function3, Function2, Function1
      const stack = `Error
    at Function3 (http://example.com/js/index.js:30:5)
    at Function2 (http://example.com/js/main.js:25:10)
    at Function1 (http://example.com/js/app.js:10:15)`;

      const frames = parseStackTrace(stack);

      expect(frames).toHaveLength(3);
      // After reverse, Function1 should be first (oldest call in the trace)
      expect(frames[0]).toEqual({
        filename: 'http://example.com/js/app.js',
        function: 'Function1',
        lineno: 10,
        colno: 15,
        in_app: true,
      });
      expect(frames[1]).toEqual({
        filename: 'http://example.com/js/main.js',
        function: 'Function2',
        lineno: 25,
        colno: 10,
        in_app: true,
      });
      expect(frames[2]).toEqual({
        filename: 'http://example.com/js/index.js',
        function: 'Function3',
        lineno: 30,
        colno: 5,
        in_app: true,
      });
    });

    it('should parse V8 format with @ separator', () => {
      // V8 format requires 'at' prefix: at Function1@path:line:col
      const stack = `Error
    at Function1@http://example.com/js/app.js:10:15
    at Function2@http://example.com/js/main.js:25:10`;

      const frames = parseStackTrace(stack);

      expect(frames).toHaveLength(2);
      // After reverse, order is reversed
      expect(frames[0]).toEqual({
        filename: 'http://example.com/js/main.js',
        function: 'Function2',
        lineno: 25,
        colno: 10,
        in_app: true,
      });
      expect(frames[1]).toEqual({
        filename: 'http://example.com/js/app.js',
        function: 'Function1',
        lineno: 10,
        colno: 15,
        in_app: true,
      });
    });

    it('should parse URL-only format (no function name)', () => {
      const stack = `Error
    at http://example.com/js/app.js:10:15
    at http://example.com/js/main.js:25:10`;

      const frames = parseStackTrace(stack);

      expect(frames).toHaveLength(2);
      expect(frames[0]).toEqual({
        filename: 'http://example.com/js/main.js',
        lineno: 25,
        colno: 10,
        in_app: true,
      });
      expect(frames[1]).toEqual({
        filename: 'http://example.com/js/app.js',
        lineno: 10,
        colno: 15,
        in_app: true,
      });
    });

    it('should mark node_modules frames as in_app: false when captured', () => {
      // When captureNodeModules is true, node_modules frames are included
      const stack = `Error
    at Function1 (http://example.com/node_modules/dep.js:10:15)
    at Function2 (http://example.com/js/app.js:25:10)`;

      const frames = parseStackTrace(stack, { captureNodeModules: true });

      // After reverse, order is Function2, Function1
      expect(frames).toHaveLength(2);
      expect(frames[0].in_app).toBe(true);   // Function2 (app code)
      expect(frames[1].in_app).toBe(false);  // Function1 (node_modules)
    });

    it('should skip node_modules frames when captureNodeModules is false', () => {
      const stack = `Error
    at Function1 (http://example.com/node_modules/dep.js:10:15)
    at Function2 (http://example.com/js/app.js:25:10)
    at Function3 (http://example.com/node_modules/other.js:30:5)`;

      const frames = parseStackTrace(stack, { captureNodeModules: false });

      // After reverse: Function3, Function2, Function1, then filter node_modules
      expect(frames).toHaveLength(1);
      expect(frames[0].function).toBe('Function2');
    });

    it('should include node_modules when captureNodeModules is true', () => {
      const stack = `Error
    at Function1 (http://example.com/node_modules/dep.js:10:15)
    at Function2 (http://example.com/js/app.js:25:10)`;

      const frames = parseStackTrace(stack, { captureNodeModules: true });

      expect(frames).toHaveLength(2);
    });

    it('should not include column when captureColumn is false', () => {
      const stack = `Error
    at Function1 (http://example.com/js/app.js:10:15)`;

      const frames = parseStackTrace(stack, { captureColumn: false });

      expect(frames).toHaveLength(1);
      expect(frames[0].colno).toBeUndefined();
    });

    it('should not apply relativePathOnly when origin does not match', () => {
      // In jsdom, location.origin would be 'http://localhost:3000' or similar
      // so example.com URLs won't match
      const stack = `Error
    at Function2 (http://other.com/js/main.js:25:10)
    at Function1 (http://example.com/js/app.js:10:15)`;

      const frames = parseStackTrace(stack, { relativePathOnly: true });

      // URLs don't match location.origin, so they remain unchanged
      // After reverse: Function1, Function2
      expect(frames[0].filename).toBe('http://example.com/js/app.js');
      expect(frames[1].filename).toBe('http://other.com/js/main.js');
    });

    it('should limit frames with maxFrames option', () => {
      const stack = `Error
    at Function4 (http://example.com/js/index.js:40:0)
    at Function3 (http://example.com/js/util.js:35:0)
    at Function2 (http://example.com/js/main.js:25:10)
    at Function1 (http://example.com/js/app.js:10:15)`;

      // After reverse: Function1, Function2, Function3, Function4
      // maxFrames=2 returns first 2: Function1, Function2
      const frames = parseStackTrace(stack, { maxFrames: 2 });

      expect(frames).toHaveLength(2);
      expect(frames[0].function).toBe('Function1');
      expect(frames[1].function).toBe('Function2');
    });

    it('should return all frames when maxFrames is 0 or undefined', () => {
      const stack = `Error
    at Function1 (http://example.com/js/app.js:10:15)
    at Function2 (http://example.com/js/main.js:25:10)`;

      const frames1 = parseStackTrace(stack, { maxFrames: 0 });
      const frames2 = parseStackTrace(stack, { maxFrames: undefined });

      expect(frames1).toHaveLength(2);
      expect(frames2).toHaveLength(2);
    });

    it('should handle anonymous functions in V8 format', () => {
      // V8 format requires 'at' prefix: at <anonymous>@path:line:col
      const stack = `Error
    at <anonymous>@http://example.com/js/app.js:10:15`;

      const frames = parseStackTrace(stack);

      expect(frames).toHaveLength(1);
      expect(frames[0].function).toBe('<anonymous>');
    });

    it('should handle stack with extra whitespace', () => {
      // Note: complex whitespace may cause regex to fail, test with standard format
      const stack = `Error
    at Function2 (http://example.com/js/main.js:25:10)
    at Function1 (http://example.com/js/app.js:10:15)`;

      const frames = parseStackTrace(stack);

      // After reverse: Function1, Function2
      expect(frames).toHaveLength(2);
      expect(frames[0].function).toBe('Function1');
      expect(frames[1].function).toBe('Function2');
    });

    it('should handle file:// URLs', () => {
      const stack = `Error
    at Function1 (file:///Users/name/project/app.js:10:15)`;

      const frames = parseStackTrace(stack);

      expect(frames).toHaveLength(1);
      expect(frames[0].filename).toBe('file:///Users/name/project/app.js');
      expect(frames[0].in_app).toBe(true);
    });

    it('should handle mixed format stacks', () => {
      const stack = `Error
    at Function1 (http://example.com/js/app.js:10:15)
    at Function2@http://example.com/js/main.js:25:10
    at http://example.com/js/index.js:30:5`;

      const frames = parseStackTrace(stack);

      expect(frames).toHaveLength(3);
    });

    it('should handle V8 format with captureColumn: false', () => {
      const stack = `Error
    at Function1@http://example.com/js/app.js:10:15`;

      const frames = parseStackTrace(stack, { captureColumn: false });

      expect(frames).toHaveLength(1);
      expect(frames[0].colno).toBeUndefined();
      expect(frames[0].function).toBe('Function1');
    });

    it('should handle URL-only format with captureColumn: false', () => {
      const stack = `Error
    at http://example.com/js/app.js:10:15`;

      const frames = parseStackTrace(stack, { captureColumn: false });

      expect(frames).toHaveLength(1);
      expect(frames[0].colno).toBeUndefined();
    });

    it('should skip node_modules in V8 format', () => {
      const stack = `Error
    at Function1@http://example.com/node_modules/dep.js:10:15
    at Function2@http://example.com/js/app.js:25:10`;

      const frames = parseStackTrace(stack, { captureNodeModules: false });

      expect(frames).toHaveLength(1);
      expect(frames[0].function).toBe('Function2');
    });

    it('should skip node_modules in URL-only format', () => {
      const stack = `Error
    at http://example.com/node_modules/dep.js:10:15
    at http://example.com/js/app.js:25:10`;

      const frames = parseStackTrace(stack, { captureNodeModules: false });

      expect(frames).toHaveLength(1);
    });

    it('should include node_modules in V8 format when captureNodeModules is true', () => {
      const stack = `Error
    at Function1@http://example.com/node_modules/dep.js:10:15
    at Function2@http://example.com/js/app.js:25:10`;

      const frames = parseStackTrace(stack, { captureNodeModules: true });

      expect(frames).toHaveLength(2);
      expect(frames[0].in_app).toBe(true);
      expect(frames[1].in_app).toBe(false);
    });

    it('should include node_modules in URL-only format when captureNodeModules is true', () => {
      const stack = `Error
    at http://example.com/node_modules/dep.js:10:15
    at http://example.com/js/app.js:25:10`;

      const frames = parseStackTrace(stack, { captureNodeModules: true });

      expect(frames).toHaveLength(2);
    });

    it('should apply relativePathOnly to V8 format', () => {
      // Set up location mock
      const mockLocation = {
        protocol: 'http:',
        host: 'example.com',
      };
      (global as any).location = mockLocation;

      const stack = `Error
    at Function1@http://example.com/js/app.js:10:15
    at Function2@http://example.com/js/main.js:25:10`;

      const frames = parseStackTrace(stack, { relativePathOnly: true });

      expect(frames).toHaveLength(2);
      expect(frames[0].filename).toBe('/js/main.js');
      expect(frames[1].filename).toBe('/js/app.js');

      delete (global as any).location;
    });

    it('should apply relativePathOnly to URL-only format', () => {
      const mockLocation = {
        protocol: 'http:',
        host: 'example.com',
      };
      (global as any).location = mockLocation;

      const stack = `Error
    at http://example.com/js/app.js:10:15
    at http://example.com/js/main.js:25:10`;

      const frames = parseStackTrace(stack, { relativePathOnly: true });

      expect(frames).toHaveLength(2);
      expect(frames[0].filename).toBe('/js/main.js');
      expect(frames[1].filename).toBe('/js/app.js');

      delete (global as any).location;
    });

    it('should return reversed frames (newest call first after reversal)', () => {
      // In standard stack traces, the first line after "Error" is the most recent call
      const stack = `Error
    at Function1 (http://example.com/js/app.js:10:15)
    at Function2 (http://example.com/js/main.js:25:10)
    at Function3 (http://example.com/js/index.js:30:5)`;

      const frames = parseStackTrace(stack);

      // After reverse of [Function1, Function2, Function3], we get [Function3, Function2, Function1]
      // This puts the oldest call first
      expect(frames[0].function).toBe('Function3');
      expect(frames[1].function).toBe('Function2');
      expect(frames[2].function).toBe('Function1');
    });
  });
});