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#include "src/tint/lang/wgsl/reader/parser/helper_test.h"

namespace tint::wgsl::reader {
namespace {

using RequiresDirectiveTest = WGSLParserTest;

// Test a valid require directive.
TEST_F(RequiresDirectiveTest, Single) {
    auto p = parser("requires readonly_and_readwrite_storage_textures;");
    p->requires_directive();
    EXPECT_FALSE(p->has_error()) << p->error();

    auto program = p->program();
    auto& ast = program.AST();
    ASSERT_EQ(ast.Requires().Length(), 1u);
    auto* req = ast.Requires()[0];
    EXPECT_EQ(req->source.range.begin.line, 1u);
    EXPECT_EQ(req->source.range.begin.column, 1u);
    EXPECT_EQ(req->source.range.end.line, 1u);
    EXPECT_EQ(req->source.range.end.column, 50u);
    ASSERT_EQ(req->features.Length(), 1u);
    EXPECT_EQ(req->features[0], wgsl::LanguageFeature::kReadonlyAndReadwriteStorageTextures);
    ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
    EXPECT_EQ(ast.GlobalDeclarations()[0], req);
}

// Test a valid require directive with a trailing comma.
TEST_F(RequiresDirectiveTest, Single_TrailingComma) {
    auto p = parser("requires readonly_and_readwrite_storage_textures,;");
    p->requires_directive();
    EXPECT_FALSE(p->has_error()) << p->error();

    auto program = p->program();
    auto& ast = program.AST();
    ASSERT_EQ(ast.Requires().Length(), 1u);
    auto* req = ast.Requires()[0];
    EXPECT_EQ(req->source.range.begin.line, 1u);
    EXPECT_EQ(req->source.range.begin.column, 1u);
    EXPECT_EQ(req->source.range.end.line, 1u);
    EXPECT_EQ(req->source.range.end.column, 51u);
    ASSERT_EQ(req->features.Length(), 1u);
    EXPECT_EQ(req->features[0], wgsl::LanguageFeature::kReadonlyAndReadwriteStorageTextures);
    ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
    EXPECT_EQ(ast.GlobalDeclarations()[0], req);
}

TEST_F(RequiresDirectiveTest, Multiple_Repeated) {
    auto p = parser(
        "requires readonly_and_readwrite_storage_textures, "
        "readonly_and_readwrite_storage_textures;");
    p->requires_directive();
    EXPECT_FALSE(p->has_error()) << p->error();

    auto program = p->program();
    auto& ast = program.AST();
    ASSERT_EQ(ast.Requires().Length(), 1u);
    auto* req = ast.Requires()[0];
    EXPECT_EQ(req->source.range.begin.line, 1u);
    EXPECT_EQ(req->source.range.begin.column, 1u);
    EXPECT_EQ(req->source.range.end.line, 1u);
    EXPECT_EQ(req->source.range.end.column, 91u);
    ASSERT_EQ(req->features.Length(), 1u);
    EXPECT_EQ(req->features[0], wgsl::LanguageFeature::kReadonlyAndReadwriteStorageTextures);
    ASSERT_EQ(ast.GlobalDeclarations().Length(), 1u);
    EXPECT_EQ(ast.GlobalDeclarations()[0], req);
}

// Test an unknown require identifier.
TEST_F(RequiresDirectiveTest, InvalidIdentifier) {
    auto p = parser("requires NotAValidRequireName;");
    p->requires_directive();
    // Error when unknown require found
    EXPECT_TRUE(p->has_error());
    EXPECT_EQ(p->error(), R"(1:10: feature 'NotAValidRequireName' is not supported)");
}

// Test the special error message when require are used with parenthesis.
TEST_F(RequiresDirectiveTest, ParenthesisSpecialCase) {
    auto p = parser("requires(Something);");
    p->translation_unit();
    EXPECT_TRUE(p->has_error());
    EXPECT_EQ(p->error(), "1:9: requires directives don't take parenthesis");
}

// Test using invalid tokens in an require directive.
TEST_F(RequiresDirectiveTest, InvalidTokens) {
    {
        auto p = parser("requires <Something;");
        p->translation_unit();
        EXPECT_TRUE(p->has_error());
        EXPECT_EQ(p->error(), R"(1:10: invalid feature name for requires)");
    }
    {
        auto p = parser("requires =;");
        p->translation_unit();
        EXPECT_TRUE(p->has_error());
        EXPECT_EQ(p->error(), R"(1:10: invalid feature name for requires)");
    }

    {
        auto p = parser("requires;");
        p->translation_unit();
        EXPECT_TRUE(p->has_error());
        EXPECT_EQ(p->error(), R"(1:9: invalid feature name for requires)");
    }
}

}  // namespace
}  // namespace tint::wgsl::reader