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

namespace tint::reader::wgsl {
namespace {

TEST_F(ParserImplTest, Statement_Call) {
    auto p = parser("a();");
    auto e = p->statement();
    ASSERT_FALSE(p->has_error()) << p->error();
    ASSERT_NE(e.value, nullptr);
    EXPECT_TRUE(e.matched);
    EXPECT_FALSE(e.errored);

    EXPECT_EQ(e->source.range.begin.line, 1u);
    EXPECT_EQ(e->source.range.begin.column, 1u);
    EXPECT_EQ(e->source.range.end.line, 1u);
    EXPECT_EQ(e->source.range.end.column, 2u);

    ASSERT_TRUE(e->Is<ast::CallStatement>());
    auto* c = e->As<ast::CallStatement>()->expr;

    ast::CheckIdentifier(c->target, "a");

    EXPECT_EQ(c->args.Length(), 0u);
}

TEST_F(ParserImplTest, Statement_Call_WithParams) {
    auto p = parser("a(1, b, 2 + 3 / b);");
    auto e = p->statement();
    ASSERT_FALSE(p->has_error()) << p->error();
    ASSERT_NE(e.value, nullptr);
    EXPECT_TRUE(e.matched);
    EXPECT_FALSE(e.errored);

    ASSERT_TRUE(e->Is<ast::CallStatement>());
    auto* c = e->As<ast::CallStatement>()->expr;

    ast::CheckIdentifier(c->target, "a");

    EXPECT_EQ(c->args.Length(), 3u);
    EXPECT_TRUE(c->args[0]->Is<ast::IntLiteralExpression>());
    EXPECT_TRUE(c->args[1]->Is<ast::IdentifierExpression>());
    EXPECT_TRUE(c->args[2]->Is<ast::BinaryExpression>());
}

TEST_F(ParserImplTest, Statement_Call_WithParams_TrailingComma) {
    auto p = parser("a(1, b,);");
    auto e = p->statement();
    ASSERT_FALSE(p->has_error()) << p->error();
    ASSERT_NE(e.value, nullptr);
    EXPECT_TRUE(e.matched);
    EXPECT_FALSE(e.errored);

    ASSERT_TRUE(e->Is<ast::CallStatement>());
    auto* c = e->As<ast::CallStatement>()->expr;

    ast::CheckIdentifier(c->target, "a");

    EXPECT_EQ(c->args.Length(), 2u);
    EXPECT_TRUE(c->args[0]->Is<ast::IntLiteralExpression>());
    EXPECT_TRUE(c->args[1]->Is<ast::IdentifierExpression>());
}

TEST_F(ParserImplTest, Statement_Call_Missing_RightParen) {
    auto p = parser("a(");
    auto e = p->statement();
    EXPECT_TRUE(p->has_error());
    EXPECT_TRUE(e.errored);
    EXPECT_FALSE(e.matched);
    EXPECT_EQ(p->error(), "1:3: expected ')' for function call");
}

TEST_F(ParserImplTest, Statement_Call_Missing_Semi) {
    auto p = parser("a()");
    auto e = p->statement();
    EXPECT_TRUE(p->has_error());
    EXPECT_TRUE(e.errored);
    EXPECT_FALSE(e.matched);
    EXPECT_EQ(p->error(), "1:4: expected ';' for function call");
}

TEST_F(ParserImplTest, Statement_Call_Bad_ArgList) {
    auto p = parser("a(b c);");
    auto e = p->statement();
    EXPECT_TRUE(p->has_error());
    EXPECT_TRUE(e.errored);
    EXPECT_FALSE(e.matched);
    EXPECT_EQ(p->error(), "1:5: expected ')' for function call");
}

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