// Copyright 2021 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
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//    this list of conditions and the following disclaimer in the documentation
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#include "src/tint/lang/msl/validate/validate.h"

#include "src/tint/utils/command/command.h"
#include "src/tint/utils/file/tmpfile.h"

namespace tint::msl::validate {

Result<SuccessType> Validate(const std::string& xcrun_path,
                             const std::string& source,
                             MslVersion version) {
    auto xcrun = tint::Command(xcrun_path);
    if (!xcrun.Found()) {
        return Failure{"xcrun not found at '" + std::string(xcrun_path) + "'"};
    }

    tint::TmpFile file(".metal");
    file << source;

    const char* version_str = nullptr;
    switch (version) {
        case MslVersion::kMsl_2_3:
            version_str = "-std=macos-metal2.3";
            break;
        case MslVersion::kMsl_2_4:
            version_str = "-std=macos-metal2.4";
            break;
        case MslVersion::kMsl_3_2:
            version_str = "-std=macos-metal3.2";
            break;
    }

#ifdef _WIN32
    // On Windows, we should actually be running metal.exe from the Metal
    // Developer Tools for Windows
    auto res = xcrun("-x", "metal",  //
                     "-o", "NUL",    //
                     version_str,    //
                     "-c", file.Path());
#else
    auto res = xcrun("-sdk", "macosx", "metal",  //
                     "-o", "/dev/null",          //
                     version_str,                //
                     "-c", file.Path());
#endif

    if (res.error_code == 0) {
        return Success;
    }

    std::string err;
    if (!res.out.empty()) {
        err = res.out;
    }
    if (!res.err.empty()) {
        if (!err.empty()) {
            err += "\n";
        }
        err += res.err;
    }
    return Failure{err};
}

}  // namespace tint::msl::validate