#!/usr/bin/env python3
# Copyright (c) 2026 Beijing Volcano Engine Technology Co., Ltd.
# SPDX-License-Identifier: Apache-2.0
"""
Simplified edge case tests for OpenViking that don't rely on complex imports.

These tests focus on boundary conditions and edge cases that can be tested
with minimal dependencies, highlighting potential issues in the codebase.
"""

import json
import unicodedata


class TestBasicEdgeCases:
    """Basic edge case tests without heavy dependencies."""

    def test_filename_length_boundaries(self):
        """Test various filename lengths."""
        # Test exactly 255 bytes
        filename_255 = "a" * 251 + ".txt"
        assert len(filename_255.encode("utf-8")) == 255
        print("255-byte filename: PASS")

        # Test 256 bytes (just over limit)
        filename_256 = "b" * 252 + ".txt"
        assert len(filename_256.encode("utf-8")) == 256
        print("256-byte filename: PASS")

        # Test very long with CJK
        cjk_filename = "测试文件名" * 30 + ".py"
        assert len(cjk_filename.encode("utf-8")) > 400
        print(f"Long CJK filename ({len(cjk_filename.encode('utf-8'))} bytes): PASS")

    def test_special_character_filenames(self):
        """Test filenames with special characters."""
        special_chars = [
            "file!@#$.txt",
            "file with spaces.txt",
            "file\ttab.txt",
            "file\nnewline.txt",
            "файл.txt",  # Cyrillic
            "档案.txt",  # Chinese
            "ملف.txt",  # Arabic
        ]

        for filename in special_chars:
            # Basic validation - should not crash
            assert len(filename) > 0
            assert isinstance(filename, str)

        print("Special character filenames: PASS")

    def test_unicode_edge_cases(self):
        """Test Unicode edge cases."""
        # Zero-width characters
        zwsp_filename = "test\u200bfile.txt"
        assert "\u200b" in zwsp_filename
        print("Zero-width character test: PASS")

        # Combining characters
        combined = "e\u0301\u0302\u0303.txt"  # e with multiple accents
        assert len(combined) > 5  # Base char + combining chars + extension
        print("Combining characters test: PASS")

        # Unicode normalization
        nfc = "café.txt"
        nfd = "cafe\u0301.txt"
        assert nfc != nfd
        assert unicodedata.normalize("NFC", nfd) == nfc
        print("Unicode normalization test: PASS")

    def test_json_edge_cases(self):
        """Test JSON handling edge cases."""
        # Empty JSON
        empty_json = "{}"
        parsed = json.loads(empty_json)
        assert parsed == {}
        print("Empty JSON test: PASS")

        # Deeply nested (but not too deep to crash)
        nested = {}
        current = nested
        for i in range(100):  # Reasonable depth
            current[f"level_{i}"] = {}
            current = current[f"level_{i}"]
        current["value"] = "deep"

        # Should serialize/deserialize without issues
        json_str = json.dumps(nested)
        parsed_nested = json.loads(json_str)
        assert parsed_nested is not None
        print("Nested JSON test: PASS")

        # JSON with special characters
        special_json = {"unicode": "测试", "emoji": "😀", "null_byte": "test\x00null"}
        json_str = json.dumps(special_json)
        parsed_special = json.loads(json_str)
        assert parsed_special["unicode"] == "测试"
        print("Special character JSON test: PASS")

    def test_path_traversal_patterns(self):
        """Test path traversal patterns."""
        dangerous_paths = [
            "../../../etc/passwd",
            "..\\..\\windows\\system32",
            "file/../../../secret.txt",
            "/etc/passwd",
            "C:\\windows\\system32\\config",
        ]

        for path in dangerous_paths:
            # Basic validation - paths should be detectable as dangerous
            assert ".." in path or "/" in path or "\\" in path

        print("Path traversal pattern detection: PASS")

    def test_empty_and_null_inputs(self):
        """Test empty and null inputs."""
        # Empty strings
        assert "" == ""
        assert len("") == 0

        # Null bytes
        null_string = "hello\x00world"
        assert "\x00" in null_string
        assert len(null_string) == 11

        # Whitespace only
        whitespace = "   \t\n   "
        assert whitespace.strip() == ""

        print("Empty/null input tests: PASS")

    def test_encoding_edge_cases(self):
        """Test various encoding scenarios."""
        # UTF-8 BOM
        bom_text = "\ufeffHello World"
        assert bom_text.startswith("\ufeff")

        # Mixed encoding content (as much as we can test without complex imports)
        mixed_content = "ASCII text with 中文 and émojis 😀"
        utf8_bytes = mixed_content.encode("utf-8")
        decoded = utf8_bytes.decode("utf-8")
        assert decoded == mixed_content

        print("Encoding edge case tests: PASS")


def run_all_tests():
    """Run all edge case tests."""
    print("Running OpenViking Edge Case Tests...")
    print("=" * 50)

    test_instance = TestBasicEdgeCases()

    tests = [
        test_instance.test_filename_length_boundaries,
        test_instance.test_special_character_filenames,
        test_instance.test_unicode_edge_cases,
        test_instance.test_json_edge_cases,
        test_instance.test_path_traversal_patterns,
        test_instance.test_empty_and_null_inputs,
        test_instance.test_encoding_edge_cases,
    ]

    passed = 0
    failed = 0

    for test in tests:
        try:
            test()
            passed += 1
        except Exception as e:
            print(f"{test.__name__}: FAILED - {e}")
            failed += 1

    print("=" * 50)
    print(f"Results: {passed} passed, {failed} failed")

    if failed > 0:
        print("\nFailed tests indicate potential edge cases that need attention!")
        return 1
    else:
        print("\nAll edge case tests passed!")
        return 0


if __name__ == "__main__":
    exit_code = run_all_tests()
    exit(exit_code)
