/**************************************************************************
* SAE - Scripted Amiga Emulator
*
* https://github.com/naTmeg/ScriptedAmigaEmulator
*
* ©2012 Rupert Hausberger
* Commercial use is prohibited.
*
**************************************************************************/

function RTC() {
	const RF5C01A_RAM_SIZE = 16;

	var clock_control_d;
	var clock_control_e;
	var clock_control_f;

	var rtc_memory = null;
	var rtc_alarm = null;

	this.read = function() {
		/*struct zfile *f;
		f = zfile_fopen (currprefs.flashfile, "rb", ZFD_NORMAL);
		if (f) {
			zfile_fread (rtc_memory, RF5C01A_RAM_SIZE, 1, f);
			zfile_fread (rtc_alarm, RF5C01A_RAM_SIZE, 1, f);
			zfile_fclose (f);
		}*/
	}
	this.write = function() {
		/*struct zfile *f = zfile_fopen (currprefs.flashfile, L"rb+", ZFD_NORMAL);
		if (!f) {
			f = zfile_fopen (currprefs.flashfile, L"wb", 0);
			if (f) {
				zfile_fwrite (rtc_memory, RF5C01A_RAM_SIZE, 1, f);
				zfile_fwrite (rtc_alarm, RF5C01A_RAM_SIZE, 1, f);
				zfile_fclose (f);
			}
			return;
		}
		zfile_fseek (f, 0, SEEK_END);
		if (zfile_ftell (f) <= 2 * RF5C01A_RAM_SIZE) {
			zfile_fseek (f, 0, SEEK_SET);
			zfile_fwrite (rtc_memory, RF5C01A_RAM_SIZE, 1, f);
			zfile_fwrite (rtc_alarm, RF5C01A_RAM_SIZE, 1, f);
		}
		zfile_fclose (f);*/
	}

	this.setup = function() {
		BUG.info('RTC.setup() type ' + (AMIGA.config.rtc.type == SAEV_Config_RTC_Type_MSM6242B ? 'MSM6242B' : 'RF5C01A'));

		if (AMIGA.config.rtc.type == SAEV_Config_RTC_Type_MSM6242B) {
			clock_control_d = 0x1;
			clock_control_e = 0;
			clock_control_f = 0x4; /* 24/12 */
		} else if (AMIGA.config.rtc.type == SAEV_Config_RTC_Type_RF5C01A) {
			clock_control_d = 0x4; /* Timer EN */
			clock_control_e = 0;
			clock_control_f = 0;

			rtc_memory = new Uint8Array(RF5C01A_RAM_SIZE);
			rtc_alarm = new Uint8Array(RF5C01A_RAM_SIZE);

			for (var i = 0; i < RF5C01A_RAM_SIZE; i++)
				rtc_memory[i] = rtc_alarm[i] = 0;

			this.read();
		}
	}

	this.load8 = function (addr) {
		addr &= 0x3f;
		if ((addr & 3) == 2 || (addr & 3) == 0 || AMIGA.config.rtc.type == SAEV_Config_RTC_Type_None) {
			if (AMIGA.config.cpu.model == 68000 && AMIGA.config.cpu.compatible)
				return 0xff; //regs.irc >> 8;
			return 0;
		}		
		var t = new Date();

		addr >>= 2;
		if (AMIGA.config.rtc.type == SAEV_Config_RTC_Type_MSM6242B) {
			switch (addr) {
				case 0x0: return t.getSeconds() % 10;
				case 0x1: return Math.floor(t.getSeconds() / 10);
				case 0x2: return t.getMinutes() % 10;
				case 0x3: return Math.floor(t.getMinutes() / 10);
				case 0x4: return t.getHours() % 10;
				case 0x5: return Math.floor(t.getHours() / 10);
				case 0x6: return t.getDate() % 10;
				case 0x7: return Math.floor(t.getDate() / 10);
				case 0x8: return (t.getMonth() + 1) % 10;
				case 0x9: return Math.floor((t.getMonth() + 1) / 10);
				case 0xA: return (t.getFullYear() - 1900) % 10;
				case 0xB: return Math.floor((t.getFullYear() - 1900) / 10); 
				case 0xC: return t.getDay();
				case 0xD: return clock_control_d;
				case 0xE: return clock_control_e;
				case 0xF: return clock_control_f;
			}
		} else if (AMIGA.config.rtc.type == SAEV_Config_RTC_Type_RF5C01A) {
			var bank = clock_control_d & 3;

			if (bank >= 2 && addr < 0x0d) return (rtc_memory[addr] >> ((bank == 2) ? 0 : 4)) & 0x0f;
			if (bank == 1 && addr < 0x0d) return rtc_alarm[addr];

			switch (addr) {
				case 0x0: return t.getSeconds() % 10;
				case 0x1: return Math.floor(t.getSeconds() / 10);
				case 0x2: return t.getMinutes() % 10;
				case 0x3: return Math.floor(t.getMinutes() / 10);
				case 0x4: return t.getHours() % 10;
				case 0x5: return Math.floor(t.getHours() / 10);
				case 0x6: return t.getDate() % 10;
				case 0x7: return Math.floor(t.getDate() / 10);
				case 0x8: return (t.getMonth() + 1) % 10;
				case 0x9: return Math.floor((t.getMonth() + 1) / 10);
				case 0xA: return (t.getFullYear() - 1900) % 10;
				case 0xB: return Math.floor((t.getFullYear() - 1900) / 10); 
				case 0xC: return t.getDay();
				case 0xD: return clock_control_d;
				/* E and F = write-only */
			}
		}
		return 0;
	}

	this.load16 = function (addr) {
		return (this.load8(addr) << 8) | this.load8(addr + 1);
	}

	this.load32 = function (addr) {
		return ((this.load16(addr) << 16) | this.load16(addr + 2)) >>> 0;
	}

	this.store8 = function (addr, value) {
		addr &= 0x3f;
		if ((addr & 1) != 1 || AMIGA.config.rtc.type == SAEV_Config_RTC_Type_None) return;

		addr >>= 2;
		value &= 0x0f;
		if (AMIGA.config.rtc.type == SAEV_Config_RTC_Type_MSM6242B) {
			switch (addr) {
				case 0xD: clock_control_d = value & (1 | 8); break;
				case 0xE: clock_control_e = value; break;
				case 0xF: clock_control_f = value; break;
			}
		} else if (AMIGA.config.rtc.type == SAEV_Config_RTC_Type_RF5C01A) {
			var bank = clock_control_d & 3;

			if (bank >= 2 && addr < 0x0d) {
				rtc_memory[addr] &= ((bank == 2) ? 0xf0 : 0x0f);
				rtc_memory[addr] |= value << ((bank == 2) ? 0 : 4);
		
				var ov = rtc_memory[addr];
				if (rtc_memory[addr] != value) this.write();
				return;
			}
			if (bank == 1 && addr < 0x0d) {
				rtc_alarm[addr] = value;
				rtc_alarm[0] = rtc_alarm[1] = rtc_alarm[9] = rtc_alarm[12] = 0;
				rtc_alarm[3] &= ~0x8;
				rtc_alarm[5] &= ~0xc;
				rtc_alarm[6] &= ~0x8;
				rtc_alarm[8] &= ~0xc;
				rtc_alarm[10] &= ~0xe;
				rtc_alarm[11] &= ~0xc;

				var ov = rtc_alarm[addr];
				if (rtc_alarm[addr] != value) this.write();
				return;
			}
			switch (addr) {
				case 0xD: clock_control_d = value; break;
				case 0xE: clock_control_e = value; break;
				case 0xF: clock_control_f = value; break;
			}
		}

	}

	this.store16 = function (addr, value) {
		this.store8(addr, (value >> 8) & 0xff);
		this.store8(addr + 1, value & 0xff);
	}

	this.store32 = function (addr, value) {
		this.store16(addr, (value >>> 16) & 0xffff);
		this.store16(addr + 2, value & 0xffff);
	}
}