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#ifndef SRC_TINT_LANG_SPIRV_READER_PARSER_HELPER_TEST_H_
#define SRC_TINT_LANG_SPIRV_READER_PARSER_HELPER_TEST_H_

#include <iostream>
#include <string>
#include <vector>

#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "spirv-tools/libspirv.hpp"
#include "src/tint/lang/core/ir/disassembler.h"
#include "src/tint/lang/core/ir/module.h"
#include "src/tint/lang/core/ir/validator.h"
#include "src/tint/lang/spirv/reader/parser/parser.h"

namespace tint::spirv::reader {

// Helper macro to run the parser and compare the disassembled IR to a string.
// Automatically prefixes the IR disassembly with a newline to improve formatting of tests.
#define EXPECT_IR(asm, ir)                               \
    do {                                                 \
        auto got = "\n" + Run(asm);                      \
        ASSERT_THAT(got, testing::HasSubstr(ir)) << got; \
    } while (false)

/// Base helper class for testing the SPIR-V parser implementation.
template <typename BASE>
class SpirvParserTestHelperBase : public BASE {
  protected:
    /// Assemble a textual SPIR-V module into a SPIR-V binary.
    /// @param spirv_asm the textual SPIR-V assembly
    /// @returns the SPIR-V binary data, or an error string
    static Result<std::vector<uint32_t>, std::string> Assemble(std::string spirv_asm) {
        StringStream err;
        std::vector<uint32_t> binary;
        spvtools::SpirvTools tools(SPV_ENV_UNIVERSAL_1_0);
        tools.SetMessageConsumer(
            [&err](spv_message_level_t, const char*, const spv_position_t& pos, const char* msg) {
                err << "SPIR-V assembly failed:" << pos.line << ":" << pos.column << ": " << msg;
            });
        if (!tools.Assemble(spirv_asm, &binary, SPV_TEXT_TO_BINARY_OPTION_PRESERVE_NUMERIC_IDS)) {
            return err.str();
        }
        return binary;
    }

    /// Run the parser on a SPIR-V module and return the Tint IR or an error string.
    /// @param spirv_asm the SPIR-V assembly to parse
    /// @returns the disassembled Tint IR
    std::string Run(std::string spirv_asm) {
        // Assemble the SPIR-V input.
        auto binary = Assemble(spirv_asm);
        if (binary != Success) {
            return binary.Failure();
        }

        // Parse the SPIR-V to produce an IR module.
        auto parsed = Parse(Slice(binary.Get().data(), binary.Get().size()));
        if (parsed != Success) {
            return parsed.Failure().reason.str();
        }

        // Validate the IR module.
        auto validated = core::ir::Validate(parsed.Get());
        if (validated != Success) {
            return validated.Failure().reason.str();
        }

        // Return the disassembled IR module.
        return core::ir::Disassemble(parsed.Get());
    }
};

using SpirvParserTest = SpirvParserTestHelperBase<testing::Test>;

template <typename T>
using SpirvParserTestWithParam = SpirvParserTestHelperBase<testing::TestWithParam<T>>;

}  // namespace tint::spirv::reader

#endif  // SRC_TINT_LANG_SPIRV_READER_PARSER_HELPER_TEST_H_