#include "memory.h"
#include "cpu.h"
#include "ppu.h"
#include "psg.h"

byte memory_readb(word address)
{
    switch (address >> 13) {
        case 0: return cpu_ram_read(address & 0x07FF);
        case 1: return ppu_io_read(address);
        case 2: return psg_io_read(address);
        case 3: return cpu_ram_read(address & 0x1FFF);
        default: return mmc_read(address);
    }
}

void memory_writeb(word address, byte data)
{
    // DMA transfer
    int i;
    if (address == 0x4014) {
        for (i = 0; i < 256; i++) {
            ppu_sprram_write(cpu_ram_read((0x100 * data) + i));
        }
        return;
    }
    switch (address >> 13) {
        case 0: return cpu_ram_write(address & 0x07FF, data);
        case 1: return ppu_io_write(address, data);
        case 2: return psg_io_write(address, data);
        case 3: return cpu_ram_write(address & 0x1FFF, data);
        default: return mmc_write(address, data);
    }
}

word memory_readw(word address)
{
    return memory_readb(address) + (memory_readb(address + 1) << 8);
}

void memory_writew(word address, word data)
{
    memory_writeb(address, data & 0xFF);
    memory_writeb(address + 1, data >> 8);
}