// Copyright (C) 2024-2026 Petr Mironychev
// SPDX-License-Identifier: GPL-3.0-or-later
// Additional attribution terms under GPLv3 §7(b) apply — see LICENSE

#include <gtest/gtest.h>

#include <ResponseCleaner.hpp>

using QodeAssist::ResponseCleaner;

TEST(ResponseCleanerTest, EmptyInputStaysEmpty)
{
    EXPECT_EQ(ResponseCleaner::clean(QString()), QString());
}

TEST(ResponseCleanerTest, PlainCodeIsUnchanged)
{
    const QString code = QStringLiteral("int main() {\n    return 0;\n}");
    EXPECT_EQ(ResponseCleaner::clean(code), code);
}

TEST(ResponseCleanerTest, ExtractsFencedCodeWithLanguage)
{
    const QString input = QStringLiteral("```cpp\nint main() {}\n```");
    EXPECT_EQ(ResponseCleaner::clean(input), QStringLiteral("int main() {}"));
}

TEST(ResponseCleanerTest, ExtractsFencedCodeWithoutLanguage)
{
    const QString input = QStringLiteral("```\nfoo\nbar\n```");
    EXPECT_EQ(ResponseCleaner::clean(input), QStringLiteral("foo\nbar"));
}

TEST(ResponseCleanerTest, StripsHeresTheExplanationPrefix)
{
    const QString input = QStringLiteral("Here's the refactored code:\nint x = 1;");
    EXPECT_EQ(ResponseCleaner::clean(input), QStringLiteral("int x = 1;"));
}

TEST(ResponseCleanerTest, StripsHereIsTheExplanationPrefix)
{
    const QString input = QStringLiteral("Here is the code:\nint y = 2;");
    EXPECT_EQ(ResponseCleaner::clean(input), QStringLiteral("int y = 2;"));
}

TEST(ResponseCleanerTest, StripsBareCodeColonPrefix)
{
    const QString input = QStringLiteral("code:\nfoo();");
    EXPECT_EQ(ResponseCleaner::clean(input), QStringLiteral("foo();"));
}

TEST(ResponseCleanerTest, TrimsLeadingAndTrailingNewlines)
{
    const QString input = QStringLiteral("\n\nhello\n\n");
    EXPECT_EQ(ResponseCleaner::clean(input), QStringLiteral("hello"));
}

TEST(ResponseCleanerTest, FencedCodeWithExplanationLineInsideIsExtractedVerbatim)
{
    const QString input = QStringLiteral("```python\nx = 1\ny = 2\n```");
    EXPECT_EQ(ResponseCleaner::clean(input), QStringLiteral("x = 1\ny = 2"));
}

TEST(ResponseCleanerTest, FencedPythonDefLineIsPreserved)
{
    const QString input = QStringLiteral("```python\ndef foo():\n    return 1\n```");
    EXPECT_EQ(ResponseCleaner::clean(input), QStringLiteral("def foo():\n    return 1"));
}

TEST(ResponseCleanerTest, FencedAccessSpecifierLineIsPreserved)
{
    const QString input = QStringLiteral("```cpp\npublic:\n    void foo();\n```");
    EXPECT_EQ(ResponseCleaner::clean(input), QStringLiteral("public:\n    void foo();"));
}

TEST(ResponseCleanerTest, UnfencedCodeStartingWithColonLineIsPreserved)
{
    const QString input = QStringLiteral("def foo():\n    return 1");
    EXPECT_EQ(ResponseCleaner::clean(input), input);
}

TEST(ResponseCleanerTest, UnfencedCaseLabelIsPreserved)
{
    const QString input = QStringLiteral("case 1:\n    break;");
    EXPECT_EQ(ResponseCleaner::clean(input), input);
}

TEST(ResponseCleanerTest, UnfencedProseHeaderIsStripped)
{
    const QString input = QStringLiteral("Refactored version:\nint x = 1;");
    EXPECT_EQ(ResponseCleaner::clean(input), QStringLiteral("int x = 1;"));
}