/*
    * AcpiWmi.hpp
    * ACPI-WMI mapper (PNP0C14): find a WMI GUID's data block in _WDG and call
    * its WMxx method
    * Copyright (c) 2026 Daniel Hammer
*/

#pragma once
#include <cstdint>
#include <ACPI/AML/AmlNamespace.hpp>

namespace Hal {
    namespace AcpiWmi {

        // _WDG flags (Microsoft "Windows Instrumentation: WMI and ACPI").
        static constexpr uint8_t FlagExpensive = 0x1;
        static constexpr uint8_t FlagMethod    = 0x2;
        static constexpr uint8_t FlagString    = 0x4;
        static constexpr uint8_t FlagEvent     = 0x8;

        // One _WDG entry, bound to the PNP0C14 device that declared it.
        struct Block {
            int32_t Device;          // namespace node of the PNP0C14 device
            char    ObjectId[2];     // names the WQxx / WSxx / WMxx methods
            uint8_t InstanceCount;
            uint8_t Flags;
        };

        // Parse "603E9613-EF25-4338-A3D0-C46177516DB7" into the byte order
        // _WDG stores (first three fields little-endian). False if malformed.
        bool ParseGuid(const char* text, uint8_t out[16]);

        // Search every present PNP0C14 device's _WDG for `guid`. The first
        // declaration wins, as on Linux.
        bool Find(const uint8_t guid[16], Block& out);

        // Evaluate WMxx(instance, methodId, input) on a method block. The input
        // is passed as a String instead of a Buffer when the block says so.
        bool EvaluateMethod(const Block& block, uint8_t instance, uint32_t methodId,
                            const uint8_t* input, uint32_t inputLength,
                            AML::Object& result);

    };
};