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// Test the type checks of dawn::Span.
// Note: all unsafe buffer warning tests are in warning_nocompile.nc.

#include <array>

#include "src/utils/heap_array.h"
#include "src/utils/typed_integer.h"

namespace dawn {

static constexpr std::array<int, 5> kSpanData = {1, 2, 3, 4, 5};

using Index = TypedInteger<struct IndexT, uint32_t>;
using IndexSizeT = TypedInteger<struct IndexT, size_t>;
enum class Val {};

using TypedHeapArray = ityp::HeapArray<Index, Val>;
using UntypedHeapArray = HeapArray<Val>;
using SmallUntypedHeapArray = ityp::HeapArray<uint8_t, Val>;
using TypedHeapArrayPOD = ityp::HeapArray<Index, int>;

void TestConstValue() {
    { HeapArray<const int> x; }  // expected-error@heap_array.h:* {{Array contents cannot be constant}}
}

// Uninit can only be used when the value type is capable of being uninitialized.
void TestUninit() {
    std::ignore = HeapArray<int>::Uninit(4);
    std::ignore = HeapArray<Val>::Uninit(4);
    std::ignore = HeapArray<Index>::Uninit(4);  // expected-error {{no matching function for call to 'Uninit'}}
}

void TestConversionToSpan() {
    TypedHeapArray arr{Index{10u}};

    // dawn::Span cannot construct from a range with a different index type.
    // This probably isn't important and could be changed.
    std::ignore = ityp::span<Index, Val>(arr);
    std::ignore = dawn::Span<Val>(arr);  // expected-error {{no matching conversion for functional-style cast from}}
}

void TestIndexing() {
    {
        TypedHeapArray arr(Index{4u});
        arr[Index{0u}];  // Control case.
        arr[0u];         // expected-error {{no viable overloaded operator[]}}
    }
    {
        UntypedHeapArray arr(4);
        arr[0u];         // Control case.
        // TODO(https://crbug.com/42240462): This should be an invalid implicit integer conversion.
        arr[0];          // Control case.
        arr[Index{0u}];  // expected-error {{no viable overloaded operator[]}}
    }
    {
        SmallUntypedHeapArray arr(4);
        arr[255];  // Control case.
        arr[256];  // expected-error {{implicit conversion from 'int' to 'unsigned char' changes value}}

        arr[uint8_t{0}];   // Control case.
        // TODO(https://crbug.com/42240462): These should be invalid implicit integer conversions.
        arr[uint32_t{0}];
        arr[int8_t{0}];
    }
}

}  // namespace dawn