#pragma once
#include "ioport.hpp"

namespace JabyEngine {
    namespace DMA_IO {
        __declare_io_value(MADR, uint32_t) { 
            static constexpr auto MemoryAdr = BitRange::from_to(0, 23);
        };

        __declare_io_value(BCR, uint32_t) {
            struct SyncMode0 {
                static constexpr auto NumberOfWords = BitRange::from_to(0, 15);
                static constexpr auto CD_OneBlock   = Bit(16);

                static constexpr BCR for_cd() {
                    //                                                                     v Should be replaced with a named constant
                    return BCR::from(SyncMode0::CD_OneBlock, SyncMode0::NumberOfWords.with(512));
                }
            };

            struct SyncMode1 {
                static constexpr auto BlockSize   = BitRange::from_to(0, 15);
                static constexpr auto BlockAmount = BitRange::from_to(16, 31);
            };

            struct SyncMode2 {
                static constexpr BCR for_gpu_cmd() {
                    return {0};
                }
            };
        };

        __declare_io_value(CHCHR, uint32_t) {
            enum SyncMode_t {
                Sync0 = 0, //Start immediately,
                Sync1 = 1, //Sync blocks to DMA requests
                Sync2 = 2, //Linked List
            };

            static constexpr auto ManualStart = Bit(28);

            static constexpr auto Start = Bit(24);
            static constexpr auto Busy  = Start;

            static constexpr auto ChoppingCPUWindowSize = BitRange::from_to(20, 22);
            static constexpr auto ChoppingDMAWindowSize = BitRange::from_to(16, 18);

            static constexpr auto SyncMode     = BitRange::from_to(9, 10);
            static constexpr auto UseSyncMode0 = SyncMode.with(Sync0);
            static constexpr auto UseSyncMode1 = SyncMode.with(Sync1);
            static constexpr auto UseSyncMode2 = SyncMode.with(Sync2);

            static constexpr auto UseChopping   = Bit(8);

            static constexpr auto MemoryAdrDecreaseBy4 = Bit(1);
            static constexpr auto MemoryAdrIncreaseBy4 = !MemoryAdrDecreaseBy4;

            static constexpr auto FromMainRAM = Bit(0);
            static constexpr auto ToMainRAM   = !FromMainRAM;

            static constexpr CHCHR StartMDECin() {
                return CHCHR{0x01000201};
            }

            static constexpr CHCHR StartMDECout() {
                return CHCHR{0x01000200};
            }

            static constexpr CHCHR StartGPUReceive() {
                return CHCHR{0x01000201};
            }

            static constexpr CHCHR StartGPULinked() {
                return CHCHR{0x01000401};
            }

            static constexpr CHCHR StartCDROM() {
                return CHCHR{0x11000000};
            }

            static constexpr CHCHR StartSPUReceive() {
                return CHCHR{0x01000201};
            }

            static constexpr CHCHR StartOTC() {
                return CHCHR{0x11000002};
            }
        };

        #pragma pack(push, 1)
        struct Registers {
            IOPort<MADR>  adr;
            IOPort<BCR>   block_ctrl;
            IOPort<CHCHR> channel_ctrl;

            inline void set_adr(uintptr_t adr) {
                this->adr.write({bit::value::set_normalized(0u, MADR::MemoryAdr.with(adr))});
            }

            inline void wait() {                    
                while(this->channel_ctrl.read().is_set(CHCHR::Busy));
            }
        };
        #pragma pack(pop)

        //0: Highest, 7: Lowest
        typedef uint32_t Priority;
        static constexpr Priority HighestPriority = 0;
        static constexpr Priority LowestPriority  = 7;

        __declare_io_value(DPCR, uint32_t) {
            static constexpr auto OTCEnable      = Bit(27);
            static constexpr auto OTCPriority    = BitRange::from_to(24, 26);

            static constexpr auto PIOEnable      = Bit(23);
            static constexpr auto PIOPriority    = BitRange::from_to(20, 22);

            static constexpr auto SPUEnable      = Bit(19);
            static constexpr auto SPUPriority    = BitRange::from_to(16, 18);

            static constexpr auto CDROMEnable     = Bit(15);
            static constexpr auto CDROMPriority   = BitRange::from_to(12, 14);

            static constexpr auto GPUEnable       = Bit(11);
            static constexpr auto GPUPriority     = BitRange::from_to(8, 10);

            static constexpr auto MDECoutEnable   = Bit(7);
            static constexpr auto MDECoutPriority = BitRange::from_to(4, 6);

            static constexpr auto MDECinEnable    = Bit(3);
            static constexpr auto MDECinPriority  = BitRange::from_to(0, 2);
        };

        __declare_io_value(DICR, uint32_t) { 
            static constexpr auto MasterEnable     = Bit(31);
            static constexpr auto Flags            = BitRange::from_to(24, 30);
            static constexpr auto MasterEnableDPCR = Bit(23);
            static constexpr auto EnableDPCR       = BitRange::from_to(16, 22);
            static constexpr auto ForceIRQ         = Bit(15);
        };

        __declare_value_at(, Registers, MDECin,  0x1F801080);
        __declare_value_at(, Registers, MDECout, 0x1F801090);
        __declare_value_at(, Registers, GPU,     0x1F8010A0);
        __declare_value_at(, Registers, CDROM,   0x1F8010B0);
        __declare_value_at(, Registers, SPU,     0x1F8010C0);
        __declare_value_at(, Registers, PIO,     0x1F8010D0);
        __declare_value_at(, Registers, OTC,     0x1F8010E0);        

        __declare_io_port(, DPCR, 0x1F8010F0);
        __declare_io_port(, DICR, 0x1F8010F4);
    }
}