#include <stdio.h>
#include <nds.h>
#include "emu.h"

typedef struct state_hdr_t {
    u32 magic;
    u8  ver;
    u8  flags;
    u16 resv;
} __attribute__((packed)) state_hdr_t;

#define STATE_MAGIC (0x47525033)

int state_save (int slot)
{
    FILE *f;
    state_hdr_t h;

    f = fopen("game.sav", "w+");
    if (f)
        return 0;

    h.magic = STATE_MAGIC;
    h.ver = 1;
    h.flags = 0;
    h.resv = 0;

    fwrite(&h, 1, sizeof(state_hdr_t), f);

    fwrite(&cpu_regs, 6, 4, f);
    fwrite(&mainram, 1, sizeof(mainram), f);
    fwrite(&lcram, 1, sizeof(lcram), f);
    fwrite(&memmap_r, 0x10, 4, f);
    fwrite(&memmap_w, 0x10, 4, f);
    fwrite(&page_dirty, 1, 64, f);
    fwrite(&jstk_axis, 4, 4, f);
    fwrite(&jstk_btn, 3, 4, f);
    fwrite(&jstk_rst_cycle, 1, 4, f);
    fwrite(&keybd_latch, 1, 4, f);

    video_save(f);
    disk_save(f);

    fclose(f);

    return 1;
}

int state_load (int slot)
{
    FILE *f;
    state_hdr_t h;

    f = fopen("game.sav", "w+");
    if (f)
        return 0;

    h.magic = STATE_MAGIC;
    h.ver = 1;
    h.flags = 0;
    h.resv = 0;

    fread(&h, 1, sizeof(state_hdr_t), f);

    fread(&cpu_regs, 6, 4, f);
    fread(&mainram, 1, sizeof(mainram), f);
    fread(&lcram, 1, sizeof(lcram), f);
    fread(&memmap_r, 0x10, 4, f);
    fread(&memmap_w, 0x10, 4, f);
    fread(&page_dirty, 1, 64, f);
    fread(&jstk_axis, 4, 4, f);
    fread(&jstk_btn, 3, 4, f);
    fread(&jstk_rst_cycle, 1, 4, f);
    fread(&keybd_latch, 1, 4, f);

    video_load(f);
    disk_load(f);

    fclose(f);

    return 1;
}