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#include "src/tint/utils/reflection/reflection.h"

#include <memory>
#include <string>

#include "src/tint/utils/math/math.h"
#include "src/tint/utils/text/string_stream.h"

namespace tint::reflection::detail {

Result<SuccessType> CheckAllFieldsReflected(VectorRef<ReflectedFieldInfo> fields,
                                            std::string_view class_name,
                                            size_t class_size,
                                            size_t class_align,
                                            bool class_is_castable,
                                            std::string_view reflect_file,
                                            uint32_t reflect_line) {
    size_t calculated_offset = class_is_castable ? sizeof(CastableBase) : 0;
    for (auto& field : fields) {
        calculated_offset = RoundUp(field.align, calculated_offset);
        if (calculated_offset < field.offset) {
            StringStream msg;
            msg << "TINT_REFLECT(" << class_name << ", ...) field mismatch at '" << field.name
                << "'.\n"
                   "Expected field offset of "
                << calculated_offset << " bytes, but field was at " << field.offset << " bytes";
            diag::Diagnostic err;
            err.message = msg.str();
            err.owned_file = std::make_shared<Source::File>(std::string(reflect_file), "");
            err.source.file = err.owned_file.get();
            err.source.range.begin.line = reflect_line;
            err.source.range.end.line = reflect_line;
            return Failure{std::move(err)};
        }
        calculated_offset += field.size;
    }
    calculated_offset = RoundUp(class_align, calculated_offset);
    if (calculated_offset != class_size) {
        StringStream msg;
        msg << "TINT_REFLECT(" << class_name
            << ", ...) missing fields at end of class\n"
               "Expected class size of "
            << calculated_offset << " bytes, but class is " << class_size << " bytes";
        diag::Diagnostic err;
        err.message = msg.str();
        err.owned_file = std::make_shared<Source::File>(std::string(reflect_file), "");
        err.source.file = err.owned_file.get();
        err.source.range.begin.line = reflect_line;
        err.source.range.end.line = reflect_line;
        return Failure{std::move(err)};
    }
    return Success;
}

}  // namespace tint::reflection::detail