// Copyright 2020 The Dawn & Tint Authors
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#include "src/tint/utils/containers/scope_stack.h"

#include "gtest/gtest.h"
#include "src/tint/utils/symbol/symbol.h"

namespace tint {
namespace {

using ScopeStackTest = testing::Test;

TEST_F(ScopeStackTest, Get) {
    auto id = GenerationID::New();

    ScopeStack<Symbol, uint32_t> s;
    Symbol a(1, id, "1");
    Symbol b(3, id, "3");
    s.Push();
    s.Set(a, 5u);
    s.Set(b, 10u);

    EXPECT_EQ(s.Get(a), 5u);
    EXPECT_EQ(s.Get(b), 10u);

    s.Push();

    s.Set(a, 15u);
    EXPECT_EQ(s.Get(a), 15u);
    EXPECT_EQ(s.Get(b), 10u);

    s.Pop();
    EXPECT_EQ(s.Get(a), 5u);
    EXPECT_EQ(s.Get(b), 10u);
}

TEST_F(ScopeStackTest, Get_MissingSymbol) {
    auto id = GenerationID::New();
    ScopeStack<Symbol, uint32_t> s;
    Symbol sym(1, id, "1");
    EXPECT_EQ(s.Get(sym), 0u);
}

TEST_F(ScopeStackTest, Set) {
    auto id = GenerationID::New();
    ScopeStack<Symbol, uint32_t> s;
    Symbol a(1, id, "1");
    Symbol b(2, id, "2");

    EXPECT_EQ(s.Set(a, 5u), 0u);
    EXPECT_EQ(s.Get(a), 5u);

    EXPECT_EQ(s.Set(b, 10u), 0u);
    EXPECT_EQ(s.Get(b), 10u);

    EXPECT_EQ(s.Set(a, 20u), 5u);
    EXPECT_EQ(s.Get(a), 20u);

    EXPECT_EQ(s.Set(b, 25u), 10u);
    EXPECT_EQ(s.Get(b), 25u);
}

TEST_F(ScopeStackTest, Clear) {
    auto id = GenerationID::New();
    ScopeStack<Symbol, uint32_t> s;
    Symbol a(1, id, "1");
    Symbol b(2, id, "2");

    EXPECT_EQ(s.Set(a, 5u), 0u);
    EXPECT_EQ(s.Get(a), 5u);

    s.Push();

    EXPECT_EQ(s.Set(b, 10u), 0u);
    EXPECT_EQ(s.Get(b), 10u);

    s.Push();

    s.Clear();
    EXPECT_EQ(s.Get(a), 0u);
    EXPECT_EQ(s.Get(b), 0u);
}

}  // namespace
}  // namespace tint
