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

# unit tests

# Basic Functionality
def test_single_special_characters():
    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"

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

# No Special Characters
def test_plain_text():
    assert _sanitize_tag_value("hello world") == "hello world"
    assert _sanitize_tag_value("simpletext") == "simpletext"

# Empty and Whitespace Strings
def test_empty_string():
    assert _sanitize_tag_value("") == ""

def test_whitespace_only():
    assert _sanitize_tag_value(" ") == " "
    assert _sanitize_tag_value("\t") == "\\t"
    assert _sanitize_tag_value("\n") == "\\n"
    assert _sanitize_tag_value("\r") == "\\r"

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

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

# Large Input Strings
def test_long_string_without_special_characters():
    assert _sanitize_tag_value("a" * 1000) == "a" * 1000

def test_long_string_with_special_characters():
    assert _sanitize_tag_value("a\n" * 500) == "a\\n" * 500
    assert _sanitize_tag_value("a\r" * 500) == "a\\r" * 500
    assert _sanitize_tag_value("a\t" * 500) == "a\\t" * 500
    assert _sanitize_tag_value("a\\" * 500) == "a\\\\" * 500
    assert _sanitize_tag_value("a|" * 500) == "a\\u{7c}" * 500
    assert _sanitize_tag_value("a," * 500) == "a\\u{2c}" * 500

# Unicode and Non-ASCII Characters
def test_unicode_characters():
    assert _sanitize_tag_value("hello世界") == "hello世界"
    assert _sanitize_tag_value("你好\n世界") == "你好\\n世界"
    assert _sanitize_tag_value("こんにちは\r世界") == "こんにちは\\r世界"

# Combination of Different Scenarios
def test_mixed_content():
    assert _sanitize_tag_value("hello\nworld\twith\rvarious\\special|characters,") == "hello\\nworld\\twith\\rvarious\\\\special\\u{7c}characters\\u{2c}"
    assert _sanitize_tag_value("normal text\nwith\tsome special\rcharacters\\") == "normal text\\nwith\\tsome special\\rcharacters\\\\"

# Performance and Scalability
def test_very_large_input():
    assert _sanitize_tag_value("a\nb\rc\td\\e|f,g" * 10000) == ("a\\nb\\rc\\td\\\\e\\u{7c}f\\u{2c}g" * 10000)

# Non-String Input (to ensure type safety)
def test_non_string_input():
    with pytest.raises(TypeError):
        _sanitize_tag_value(None)
    with pytest.raises(TypeError):
        _sanitize_tag_value(12345)
    with pytest.raises(TypeError):
        _sanitize_tag_value([1, 2, 3])