// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "src/tint/ast/id_attribute.h"
#include "src/tint/reader/wgsl/parser_impl_test_helper.h"

namespace tint::reader::wgsl {
namespace {

TEST_F(ParserImplTest, GlobalConstantDecl) {
    auto p = parser("let a : f32 = 1.");
    auto attrs = p->attribute_list();
    EXPECT_FALSE(attrs.errored);
    EXPECT_FALSE(attrs.matched);
    auto e = p->global_constant_decl(attrs.value);
    EXPECT_FALSE(p->has_error()) << p->error();
    EXPECT_TRUE(e.matched);
    EXPECT_FALSE(e.errored);
    auto* let = e.value->As<ast::Let>();
    ASSERT_NE(let, nullptr);

    EXPECT_EQ(let->symbol, p->builder().Symbols().Get("a"));
    ASSERT_NE(let->type, nullptr);
    EXPECT_TRUE(let->type->Is<ast::F32>());

    EXPECT_EQ(let->source.range.begin.line, 1u);
    EXPECT_EQ(let->source.range.begin.column, 5u);
    EXPECT_EQ(let->source.range.end.line, 1u);
    EXPECT_EQ(let->source.range.end.column, 6u);

    ASSERT_NE(let->constructor, nullptr);
    EXPECT_TRUE(let->constructor->Is<ast::LiteralExpression>());
}

TEST_F(ParserImplTest, GlobalConstantDecl_Inferred) {
    auto p = parser("let a = 1.");
    auto attrs = p->attribute_list();
    EXPECT_FALSE(attrs.errored);
    EXPECT_FALSE(attrs.matched);
    auto e = p->global_constant_decl(attrs.value);
    EXPECT_FALSE(p->has_error()) << p->error();
    EXPECT_TRUE(e.matched);
    EXPECT_FALSE(e.errored);
    auto* let = e.value->As<ast::Let>();
    ASSERT_NE(let, nullptr);

    EXPECT_EQ(let->symbol, p->builder().Symbols().Get("a"));
    EXPECT_EQ(let->type, nullptr);

    EXPECT_EQ(let->source.range.begin.line, 1u);
    EXPECT_EQ(let->source.range.begin.column, 5u);
    EXPECT_EQ(let->source.range.end.line, 1u);
    EXPECT_EQ(let->source.range.end.column, 6u);

    ASSERT_NE(let->constructor, nullptr);
    EXPECT_TRUE(let->constructor->Is<ast::LiteralExpression>());
}

TEST_F(ParserImplTest, GlobalConstantDecl_InvalidExpression) {
    auto p = parser("let a : f32 = if (a) {}");
    auto attrs = p->attribute_list();
    EXPECT_FALSE(attrs.errored);
    EXPECT_FALSE(attrs.matched);
    auto e = p->global_constant_decl(attrs.value);
    EXPECT_TRUE(p->has_error());
    EXPECT_TRUE(e.errored);
    EXPECT_FALSE(e.matched);
    EXPECT_EQ(e.value, nullptr);
    EXPECT_EQ(p->error(), "1:15: invalid type for const_expr");
}

TEST_F(ParserImplTest, GlobalConstantDecl_MissingExpression) {
    auto p = parser("let a : f32 =");
    auto attrs = p->attribute_list();
    EXPECT_FALSE(attrs.errored);
    EXPECT_FALSE(attrs.matched);
    auto e = p->global_constant_decl(attrs.value);
    EXPECT_TRUE(p->has_error());
    EXPECT_TRUE(e.errored);
    EXPECT_FALSE(e.matched);
    EXPECT_EQ(e.value, nullptr);
    EXPECT_EQ(p->error(), "1:14: unable to parse const_expr");
}

TEST_F(ParserImplTest, GlobalConstantDec_Override_WithId) {
    auto p = parser("@id(7) override a : f32 = 1.");
    auto attrs = p->attribute_list();
    EXPECT_FALSE(attrs.errored);
    EXPECT_TRUE(attrs.matched);

    auto e = p->global_constant_decl(attrs.value);
    EXPECT_FALSE(p->has_error()) << p->error();
    EXPECT_TRUE(e.matched);
    EXPECT_FALSE(e.errored);
    auto* override = e.value->As<ast::Override>();
    ASSERT_NE(override, nullptr);

    EXPECT_EQ(override->symbol, p->builder().Symbols().Get("a"));
    ASSERT_NE(override->type, nullptr);
    EXPECT_TRUE(override->type->Is<ast::F32>());

    EXPECT_EQ(override->source.range.begin.line, 1u);
    EXPECT_EQ(override->source.range.begin.column, 17u);
    EXPECT_EQ(override->source.range.end.line, 1u);
    EXPECT_EQ(override->source.range.end.column, 18u);

    ASSERT_NE(override->constructor, nullptr);
    EXPECT_TRUE(override->constructor->Is<ast::LiteralExpression>());

    auto* override_attr = ast::GetAttribute<ast::IdAttribute>(override->attributes);
    ASSERT_NE(override_attr, nullptr);
    EXPECT_EQ(override_attr->value, 7u);
}

TEST_F(ParserImplTest, GlobalConstantDec_Override_WithoutId) {
    auto p = parser("override a : f32 = 1.");
    auto attrs = p->attribute_list();
    EXPECT_FALSE(attrs.errored);
    EXPECT_FALSE(attrs.matched);

    auto e = p->global_constant_decl(attrs.value);
    EXPECT_FALSE(p->has_error()) << p->error();
    EXPECT_TRUE(e.matched);
    EXPECT_FALSE(e.errored);
    auto* override = e.value->As<ast::Override>();
    ASSERT_NE(override, nullptr);

    EXPECT_EQ(override->symbol, p->builder().Symbols().Get("a"));
    ASSERT_NE(override->type, nullptr);
    EXPECT_TRUE(override->type->Is<ast::F32>());

    EXPECT_EQ(override->source.range.begin.line, 1u);
    EXPECT_EQ(override->source.range.begin.column, 10u);
    EXPECT_EQ(override->source.range.end.line, 1u);
    EXPECT_EQ(override->source.range.end.column, 11u);

    ASSERT_NE(override->constructor, nullptr);
    EXPECT_TRUE(override->constructor->Is<ast::LiteralExpression>());

    auto* id_attr = ast::GetAttribute<ast::IdAttribute>(override->attributes);
    ASSERT_EQ(id_attr, nullptr);
}

TEST_F(ParserImplTest, GlobalConstantDec_Override_MissingId) {
    auto p = parser("@id() override a : f32 = 1.");
    auto attrs = p->attribute_list();
    EXPECT_TRUE(attrs.errored);
    EXPECT_FALSE(attrs.matched);

    auto e = p->global_constant_decl(attrs.value);
    EXPECT_TRUE(e.matched);
    EXPECT_FALSE(e.errored);
    auto* override = e.value->As<ast::Override>();
    ASSERT_NE(override, nullptr);

    EXPECT_TRUE(p->has_error());
    EXPECT_EQ(p->error(), "1:5: expected signed integer literal for id attribute");
}

TEST_F(ParserImplTest, GlobalConstantDec_Override_InvalidId) {
    auto p = parser("@id(-7) override a : f32 = 1.");
    auto attrs = p->attribute_list();
    EXPECT_TRUE(attrs.errored);
    EXPECT_FALSE(attrs.matched);

    auto e = p->global_constant_decl(attrs.value);
    EXPECT_TRUE(e.matched);
    EXPECT_FALSE(e.errored);
    auto* override = e.value->As<ast::Override>();
    ASSERT_NE(override, nullptr);

    EXPECT_TRUE(p->has_error());
    EXPECT_EQ(p->error(), "1:5: id attribute must be positive");
}

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