#ifndef __FENNIX_API_AC97_H__
#define __FENNIX_API_AC97_H__

#include <types.h>
#include <pci.h>
#include <io.h>

#define DescriptorListLength 0x20

enum AudioVolumeValues
{
    AV_Maximum = 0x0,
    AV_Minimum = 0x3F,
};

enum AudioEncodingValues
{
    AE_PCMs8,
    AE_PCMu8,

    AE_PCMs16le,
    AE_PCMs20le,
    AE_PCMs24le,
    AE_PCMs32le,

    AE_PCMu16le,
    AE_PCMu20le,
    AE_PCMu24le,
    AE_PCMu32le,

    AE_PCMs16be,
    AE_PCMs20be,
    AE_PCMs24be,
    AE_PCMs32be,

    AE_PCMu16be,
    AE_PCMu20be,
    AE_PCMu24be,
    AE_PCMu32be,
};

enum NativeAudioMixerRegisters
{
    /**
     * @brief Reset Register
     * @note Length: word
     */
    NAM_Reset = 0x00,

    /**
     * @brief Master Volume Register
     * @note Length: word
     */
    NAM_MasterVolume = 0x02,

    /**
     * @brief Microphone Volume Register
     * @note Length: word
     */
    NAM_MicrophoneVolume = 0x0E,

    /**
     * @brief PCM Out Volume Register
     * @note Length: word
     */
    NAM_PCMOutVolume = 0x18,

    /**
     * @brief Select Record Input Register
     * @note Length: word
     */
    NAM_SelectRecordInput = 0x1A,

    /**
     * @brief Record Gain Register
     * @note Length: word
     */
    NAM_RecordGain = 0x1C,

    /**
     * @brief Record Gain Microphone Register
     * @note Length: word
     */
    NAM_RecordGainMicrophone = 0x1E,
};

enum NativeAudioBusMasterRegisters
{
    /**
     * @brief Register box for PCM IN
     * @note Length: below
     */
    NABM_PCMInBox = 0x00,

    /**
     * @brief Register box for PCM OUT
     * @note Length: below
     */
    NABM_PCMOutBox = 0x10,

    /**
     * @brief Register box for Microphone
     * @note Length: below
     */
    NABM_MicrophoneBox = 0x20,

    /**
     * @brief Global Control Register
     * @note Length: dword
     */
    NABM_GlobalControl = 0x2C, /* 0x30 */

    /**
     * @brief Global Status Register
     * @note Length: dword
     */
    NABM_GlobalStatus = 0x30, /* 0x34 */
};

enum NativeAudioBusMasterBoxOffsets
{
    /**
     * @brief Physical Address of Buffer Descriptor List
     * @note Length: dword
     */
    NABMBOFF_BufferDescriptorList = 0x00,

    /**
     * @brief Number of Actual Processed Buffer Descriptor Entry
     * @note Length: byte
     */
    NABMBOFF_BufferDescriptorEntry = 0x04,

    /**
     * @brief Number of all Descriptor Entries
     * @note Length: byte
     */
    NABMBOFF_DescriptorEntries = 0x05,

    /**
     * @brief Status of transferring Data
     * @note Length: word
     */
    NABMBOFF_Status = 0x06,

    /**
     * @brief Number of transferred Samples in Actual Processed Entry
     * @note Length: word
     */
    NABMBOFF_TransferredSamples = 0x08,

    /**
     * @brief Number of next processed Buffer Entry
     * @note Length: byte
     */
    NABMBOFF_NextProcessedBufferEntry = 0x0A,

    /**
     * @brief Transfer Control
     * @note Length: byte
     */
    NABMBOFF_TransferControl = 0x0B,
};

enum OutputPulseCodeModulationRegisters
{
    /**
     * @brief Physical Address of Buffer Descriptor List
     * @note Length: dword
     */
    PCMOUT_BufferDescriptorList = NABM_PCMOutBox + NABMBOFF_BufferDescriptorList,

    /**
     * @brief Number of Actual Processed Buffer Descriptor Entry
     * @note Length: byte
     */
    PCMOUT_BufferDescriptorEntry = NABM_PCMOutBox + NABMBOFF_BufferDescriptorEntry,

    /**
     * @brief Number of all Descriptor Entries
     * @note Length: byte
     */
    PCMOUT_DescriptorEntries = NABM_PCMOutBox + NABMBOFF_DescriptorEntries,

    /**
     * @brief Status of transferring Data
     * @note Length: word
     */
    PCMOUT_Status = NABM_PCMOutBox + NABMBOFF_Status,

    /**
     * @brief Number of transferred Samples in Actual Processed Entry
     * @note Length: word
     */
    PCMOUT_TransferredSamples = NABM_PCMOutBox + NABMBOFF_TransferredSamples,

    /**
     * @brief Number of next processed Buffer Entry
     * @note Length: byte
     */
    PCMOUT_NextProcessedBufferEntry = NABM_PCMOutBox + NABMBOFF_NextProcessedBufferEntry,

    /**
     * @brief Transfer Control
     * @note Length: byte
     */
    PCMOUT_TransferControl = NABM_PCMOutBox + NABMBOFF_TransferControl,
};

enum TransferControlRegisters
{
    /**
     * @brief DMA controller control
     * 0 = Pause transfer
     * 1 = Transfer sound data
     */
    TC_DMAControllerControl = 0x01,

    /**
     * @brief Reset
     * 0 = Remove reset condition
     * 1 = Reset this NABM register box, this bit is cleared by card when is reset complete
     */
    TC_TransferReset = 0x02,

    /**
     * @brief Last Buffer Entry Interrupt enable
     * 0 = Disable interrupt
     * 1 = Enable interrupt
     */
    TC_LastBufferEntryInterruptEnable = 0x04,

    /**
     * @brief IOC Interrupt enable
     * 0 = Disable interrupt
     * 1 = Enable interrupt
     */
    TC_IOCInterruptEnable = 0x08,

    /**
     * @brief Fifo ERROR Interrupt enable
     * 0 = Disable interrupt
     * 1 = Enable interrupt
     */
    TC_FifoERRORInterruptEnable = 0x10,
};

enum GlobalControlRegisters
{
    /**
     * @brief Global Interrupt Enable
     * 0 = Disable Interrupts
     * 1 = Enable Interrupts
     */
    GC_GlobalInterruptEnable = 0x01,

    /**
     * @brief Cold reset
     * 0 = Device is in reset and can not be used
     * 1 = Resume to operational state
     */
    GC_ColdReset = 0x02,

    /**
     * @brief Warm reset
     */
    GC_WarmReset = 0x04,

    /**
     * @brief Shut down
     * 0 = Device is powered
     * 1 = Shut down
     */
    GC_ShutDown = 0x08,

    /**
     * @brief Channels for PCM Output
     * 00 = 2 channels
     * 01 = 4 channels
     * 10 = 6 channels
     * 11 = Reserved
     */
    GC_ChannelsForPCMOutput = 0x30,

    /**
     * @brief PCM Output mode
     * 00 = 16 bit samples
     * 01 = 20 bit samples
     */
    GC_PCMOutputMode = 0xC0,
};

struct BufferDescriptorList
{
    /**
     * @brief Physical Address to sound data in memory
     * @note Length: dword
     */
    uint32_t Address;

    /**
     * @brief Number of samples in this buffer
     * @note Length: word
     */
    uint16_t SampleCount;

    /**
     * @brief Flags
     * @note Length: word
     *
     * Bit 15 = Interrupt fired when data from this entry is transferred
     * Bit 14 = Last entry of buffer, stop playing
     * Other bits = Reserved
     */
    uint16_t Flags;
} __attribute__((packed));

struct BARData
{
    uint8_t Type;
    uint64_t MixerAddress;
    uint64_t BusMasterAddress;
};

#endif // !__FENNIX_API_AC97_H__