// Copyright 2020 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
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#include "src/tint/lang/msl/writer/writer.h"

#include <memory>
#include <utility>

#include "src/tint/lang/msl/writer/ast_printer/ast_printer.h"
#include "src/tint/lang/msl/writer/common/option_helpers.h"
#include "src/tint/lang/msl/writer/printer/printer.h"
#include "src/tint/lang/msl/writer/raise/raise.h"

#if TINT_BUILD_WGSL_READER
#include "src/tint/lang/wgsl/reader/lower/lower.h"
#include "src/tint/lang/wgsl/reader/program_to_ir/program_to_ir.h"
#endif

namespace tint::msl::writer {

Result<Output> Generate(core::ir::Module& ir, const Options& options) {
    {
        auto res = ValidateBindingOptions(options);
        if (res != Success) {
            return res.Failure();
        }
    }

    Output output;

    // Raise from core-dialect to MSL-dialect.
    if (auto res = Raise(ir, options); res != Success) {
        return res.Failure();
    }

    // Generate the MSL code.
    auto result = Print(ir);
    if (result != Success) {
        return result.Failure();
    }
    output.msl = result.Get();
    return output;
}

Result<Output> Generate(const Program& program, const Options& options) {
    if (!program.IsValid()) {
        return Failure{program.Diagnostics()};
    }

    {
        auto res = ValidateBindingOptions(options);
        if (res != Success) {
            return res.Failure();
        }
    }

    Output output;

    // Sanitize the program.
    auto sanitized_result = Sanitize(program, options);
    if (!sanitized_result.program.IsValid()) {
        return Failure{sanitized_result.program.Diagnostics()};
    }
    output.needs_storage_buffer_sizes = sanitized_result.needs_storage_buffer_sizes;
    output.used_array_length_from_uniform_indices =
        std::move(sanitized_result.used_array_length_from_uniform_indices);

    // Generate the MSL code.
    auto impl = std::make_unique<ASTPrinter>(sanitized_result.program);
    if (!impl->Generate()) {
        return Failure{impl->Diagnostics()};
    }
    output.msl = impl->Result();
    output.has_invariant_attribute = impl->HasInvariant();
    output.workgroup_allocations = impl->DynamicWorkgroupAllocations();

    return output;
}

}  // namespace tint::msl::writer
