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/**
 * @file GenLogicalToAsmMapping.cpp
 * @brief Generates Logical IR -> ASM mnemonic mapping (per-arch) for ToStinkyAsmPass.
 *
 * Uses the same per-arch data as the Rocisa LogicalToArchMap (logical name -> hw mnemonic)
 * so that logical IR lowering emits the correct mnemonic per architecture
 * (e.g. ds_read_* on CDNA, ds_load_* on RDNA).
 */

#include <filesystem>
#include <fstream>
#include <iostream>
#include <string>
#include <unordered_map>

#include "gfx/GpuArchManager.hpp"
#include "gfx/InstDefDSL.hpp"

using namespace stinkytofu;

namespace {
bool genLogicalToAsmMappingsImpl(GpuArchManager& manager, const std::string& outdir) {
    std::filesystem::path path =
        std::filesystem::path(outdir) / "stinkytofu/ir/LogicalToAsmMappings_generated.inc";

    std::ofstream os(path);
    if (!os) {
        std::cerr << "Cannot write " << path << "\n";
        return false;
    }

    os << "//===----------------------------------------------------------------------===//\n"
       << "// Auto-generated Logical IR -> ASM mnemonic mapping (per-arch)\n"
       << "// Used by ToStinkyAsmPass for correct lowering (e.g. ds_read vs ds_load).\n"
       << "// DO NOT EDIT MANUALLY!\n"
       << "//===----------------------------------------------------------------------===//\n\n"
       << "#include <cstring>\n\n"
       << "namespace stinkytofu {\n"
       << "static inline const char* getMnemonicForLogicalOnArch(const char* logicalName, "
          "GfxArchID "
          "arch)\n"
       << "{\n"
       << "    switch(arch)\n"
       << "    {\n";

    for (const std::string& archName : manager.getRegisteredArchNames()) {
        const GpuArch* arch = manager.getArch(archName);
        const auto& map = arch->getLogicalToArchMap();

        os << "        case GfxArchID::" << archName << ":\n";
        for (const auto& [logicalName, mnemonic] : map) {
            os << "            if(std::strcmp(logicalName, \"" << logicalName
               << "\") == 0) return \"" << mnemonic << "\";\n";
        }
        os << "            break;\n";
    }

    os << "        default:\n"
       << "            return nullptr;\n"
       << "    }\n"
       << "    return nullptr;\n"
       << "}\n"
       << "} // namespace stinkytofu\n";

    std::cerr << "Generating Logical IR -> ASM mappings in " << path << "\n";
    return true;
}
}  // namespace

namespace stinkytofu {
// NOLINTNEXTLINE(misc-use-internal-linkage)
bool genLogicalToAsmMappings(GpuArchManager& manager, const std::string& outdir) {
    return genLogicalToAsmMappingsImpl(manager, outdir);
}
}  // namespace stinkytofu
