#include "DSGM.h"

int DSGM_nextPalette[2] = { 0, 0 };

inline void DSGM_UnlockSpritePalette(u8 screen) {
	switch(screen) {
		case DSGM_TOP:
			vramSetBankF(VRAM_F_LCD);
			break;
			
		case DSGM_BOTTOM:
			vramSetBankI(VRAM_I_LCD);
			break;
	}
}

inline void DSGM_LockSpritePalette(u8 screen) {
	switch(screen) {
		case DSGM_TOP:
			vramSetBankF(VRAM_F_SPRITE_EXT_PALETTE);
			break;
			
		case DSGM_BOTTOM:
			vramSetBankI(VRAM_I_SUB_SPRITE_EXT_PALETTE);
			break;
	}
}

inline u16 *DSGM_GetPaletteData(u8 screen, DSGM_Palette *palette) {
	return (screen == DSGM_TOP ? VRAM_F_EXT_SPR_PALETTE : VRAM_I_EXT_SPR_PALETTE)[palette->paletteNumber[screen]];
}

inline int DSGM_NextFreePalette(u8 screen) {
	return DSGM_nextPalette[screen]++;
}

inline bool DSGM_PaletteLoaded(u8 screen, DSGM_Palette *palette) {
	return palette->paletteNumber[screen] != DSGM_NO_PALETTE;
}

inline bool DSGM_PaletteIsNitro(DSGM_Palette *palette) {
	return !palette->palette;
}

void DSGM_ClearPalettes(DSGM_Palette *palettes, int paletteCount) {
	int i;
	
	DSGM_nextPalette[DSGM_TOP] = 0;
	DSGM_nextPalette[DSGM_BOTTOM] = 0;
	
	for(i = 0; i < paletteCount; i++) {
		palettes[i].paletteNumber[DSGM_TOP] = DSGM_NO_PALETTE;
		palettes[i].paletteNumber[DSGM_BOTTOM] = DSGM_NO_PALETTE;
	}
}

void DSGM_LoadPaletteFull(u8 screen, DSGM_Palette *palette) {
	DSGM_UnlockSpritePalette(screen);
	palette->paletteNumber[screen] = DSGM_NextFreePalette(screen);
	if(DSGM_PaletteIsNitro(palette)) {
		if(screen == DSGM_TOP) DSGM_ReadFileManual(VRAM_F_EXT_SPR_PALETTE[palette->paletteNumber[screen]], 0, DSGM_AUTO_LENGTH, palette->nitroFilename);
		if(screen == DSGM_BOTTOM) DSGM_ReadFileManual(VRAM_I_EXT_SPR_PALETTE[palette->paletteNumber[screen]], 0, DSGM_AUTO_LENGTH, palette->nitroFilename);
	}
	else {
		if(screen == DSGM_TOP) dmaCopy(palette->palette, VRAM_F_EXT_SPR_PALETTE[palette->paletteNumber[screen]], *palette->paletteLength);
		if(screen == DSGM_BOTTOM) dmaCopy(palette->palette, VRAM_I_EXT_SPR_PALETTE[palette->paletteNumber[screen]], *palette->paletteLength);
	}
	DSGM_LockSpritePalette(screen);
}