# imports
import pytest  # used for our unit tests
from sentry_sdk.metrics import _sanitize_tag_value

# unit tests

# Basic Functionality
def test_basic_no_special_chars():
    assert _sanitize_tag_value("hello") == "hello"
    assert _sanitize_tag_value("world") == "world"

def test_basic_with_special_chars():
    assert _sanitize_tag_value("hello\nworld") == "hello\\nworld"
    assert _sanitize_tag_value("hello\rworld") == "hello\\rworld"
    assert _sanitize_tag_value("hello\tworld") == "hello\\tworld"
    assert _sanitize_tag_value("hello\\world") == "hello\\\\world"
    assert _sanitize_tag_value("hello|world") == "hello\\u{7c}world"
    assert _sanitize_tag_value("hello,world") == "hello\\u{2c}world"

# Edge Cases
def test_empty_string():
    assert _sanitize_tag_value("") == ""

def test_only_special_chars():
    assert _sanitize_tag_value("\n\r\t\\|,") == "\\n\\r\\t\\\\\\u{7c}\\u{2c}"

def test_repeated_special_chars():
    assert _sanitize_tag_value("\\n\\n") == "\\\\n\\\\n"
    assert _sanitize_tag_value("||") == "\\u{7c}\\u{7c}"

# Mixed Content
def test_mixed_alphanumeric_special_chars():
    assert _sanitize_tag_value("abc\n123\rxyz\t456\\789|0,a") == "abc\\n123\\rxyz\\t456\\\\789\\u{7c}0\\u{2c}a"

def test_unicode_characters():
    assert _sanitize_tag_value("hello\u1234world") == "hello\u1234world"

# Performance and Scalability
def test_large_string_no_special_chars():
    assert _sanitize_tag_value("a" * 10000) == "a" * 10000

def test_large_string_with_special_chars():
    assert _sanitize_tag_value("\n" * 10000) == "\\n" * 10000

# Invalid Input Handling
def test_non_string_input():
    with pytest.raises(TypeError):
        _sanitize_tag_value(12345)
    with pytest.raises(TypeError):
        _sanitize_tag_value([1, 2, 3])
    with pytest.raises(TypeError):
        _sanitize_tag_value({"key": "value"})

# Boundary Conditions
def test_boundary_special_chars():
    assert _sanitize_tag_value("\nstart") == "\\nstart"
    assert _sanitize_tag_value("end\n") == "end\\n"
    assert _sanitize_tag_value("|start,end|") == "\\u{7c}start\\u{2c}end\\u{7c}"

# Complex Cases
def test_nested_special_chars():
    assert _sanitize_tag_value("hello\\nworld|hello,world") == "hello\\\\nworld\\u{7c}hello\\u{2c}world"

def test_escape_sequences():
    assert _sanitize_tag_value("hello\\nworld") == "hello\\\\nworld"
    assert _sanitize_tag_value("hello\\rworld") == "hello\\\\rworld"

# Real-World Examples
def test_file_paths():
    assert _sanitize_tag_value("C:\\Users\\Name\\Documents") == "C:\\\\Users\\\\Name\\\\Documents"

def test_urls():
    assert _sanitize_tag_value("https://example.com/path?query=value") == "https://example.com/path?query=value"