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#ifndef SRC_TINT_LANG_MSL_VALIDATE_VALIDATE_H_
#define SRC_TINT_LANG_MSL_VALIDATE_VALIDATE_H_

#include <string>
#include <utility>

#include "src/tint/lang/wgsl/ast/pipeline_stage.h"

// Forward declarations
namespace tint {
class Program;
}  // namespace tint

namespace tint::msl::validate {

/// The version of MSL to validate against.
/// Note: these must kept be in ascending order
enum class MslVersion {
    kMsl_1_2,
    kMsl_2_1,
    kMsl_2_3,
};

/// MslVersion less-than operator
inline bool operator<(MslVersion a, MslVersion b) {
    return static_cast<int>(a) < static_cast<int>(b);
}

/// The return structure of Validate()
struct Result {
    /// True if validation passed
    bool failed = false;
    /// Output of Metal compiler.
    std::string output;
};

/// Validate attempts to compile the shader with the Metal Shader Compiler,
/// verifying that the shader compiles successfully.
/// @param xcrun_path path to xcrun
/// @param source the generated MSL source
/// @param version the version of MSL to validate against
/// @return the result of the compile
Result Validate(const std::string& xcrun_path, const std::string& source, MslVersion version);

#if TINT_BUILD_IS_MAC
/// ValidateUsingMetal attempts to compile the shader with the runtime Metal Shader Compiler
/// API, verifying that the shader compiles successfully.
/// @param source the generated MSL source
/// @param version the version of MSL to validate against
/// @return the result of the compile
Result ValidateUsingMetal(const std::string& source, MslVersion version);
#endif  // TINT_BUILD_IS_MAC

}  // namespace tint::msl::validate

#endif  // SRC_TINT_LANG_MSL_VALIDATE_VALIDATE_H_