// Copyright 2021 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
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//    this list of conditions and the following disclaimer in the documentation
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#include "src/tint/lang/glsl/writer/writer.h"

#include <memory>
#include <utility>

#include "src/tint/lang/glsl/writer/ast_printer/ast_printer.h"
#include "src/tint/lang/glsl/writer/printer/printer.h"
#include "src/tint/lang/glsl/writer/raise/raise.h"

namespace tint::glsl::writer {

Result<Output> Generate(core::ir::Module& ir, const Options& options, const std::string&) {
    Output output;

    // Raise from core-dialect to GLSL-dialect.
    if (auto res = raise::Raise(ir); !res) {
        return res.Failure();
    }

    // Generate the GLSL code.
    auto result = Print(ir, options.version);
    if (!result) {
        return result.Failure();
    }
    output.glsl = result.Get();

    return output;
}

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

    Output output;

    // Sanitize the program.
    auto sanitized_result = Sanitize(program, options, entry_point);
    if (!sanitized_result.program.IsValid()) {
        return Failure{sanitized_result.program.Diagnostics()};
    }

    // Generate the GLSL code.
    auto impl = std::make_unique<ASTPrinter>(sanitized_result.program, options.version);
    if (!impl->Generate()) {
        return Failure{impl->Diagnostics()};
    }

    output.glsl = impl->Result();
    output.needs_internal_uniform_buffer = sanitized_result.needs_internal_uniform_buffer;
    output.bindpoint_to_data = std::move(sanitized_result.bindpoint_to_data);

    // Collect the list of entry points in the sanitized program.
    for (auto* func : sanitized_result.program.AST().Functions()) {
        if (func->IsEntryPoint()) {
            auto name = func->name->symbol.Name();
            output.entry_points.push_back({name, func->PipelineStage()});
        }
    }

    return output;
}

}  // namespace tint::glsl::writer