/*
 *	Copyright (c) 2024 Scott Duensing, scott@kangaroopunch.com
 *
 *	Permission is hereby granted, free of charge, to any person obtaining a copy
 *	of this software and associated documentation files (the "Software"), to deal
 *	in the Software without restriction, including without limitation the rights
 *	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 *	copies of the Software, and to permit persons to whom the Software is
 *	furnished to do so, subject to the following conditions:
 *
 *	The above copyright notice and this permission notice shall be included in
 *	all copies or substantial portions of the Software.
 *
 *	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 *	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 *	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 *	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 *	SOFTWARE.
 */


/*
 * Z-Machine for the Foenix F256 computers.
 *
 * F256 machines are 65c02 based systems with 512k of banked RAM.
 * As such, this ZIP is going to load the story entirely into "high"
 * memory (above the 64k accessable to the CPU) and page things in
 * and out as needed.
 *
 * To keep library code at a minimum, we'll also statically allocate
 * as much as possible and do other "bad" things now frowned upon in
 * modern development.  :-)
 */


#include "f256.h"

#include "portme.h"
#include "story.h"
#include "memory.h"
#include "state.h"
#include "interpreter.h"


#define BASE_ADDRESS   0x10000


uint8_t portByteGet(uint16_t address) {
	return FAR_PEEK(BASE_ADDRESS + address);
}


void portByteSet(uint16_t address, uint8_t value) {
	FAR_POKE(BASE_ADDRESS + address, value);
}


void portCharPrint(char c) {
	static char ch[2] = { 0, 0 };
	ch[0] = c;
	textPrint(ch);
}


void portDie(char *fmt, ...) {
#ifdef DEBUGGING
	printf("%s\n", fmt);  // Yeah, this isn't right.
#endif
	exit(1);
}


bool portFileRestore(void) {

	FILE     *in;
	bool      ok  = false;
	uint32_t  i;
	byte      b;

	in = fopen("save.dat", "rb");
	if (in) {
		ok = true;

		// Read in PC.
		ok &= (fread(&__state.pc, sizeof(__state.pc), 1, in) == 1);
		// Read in SP.
		ok &= (fread(&__state.sp, sizeof(__state.sp), 1, in) == 1);
		// Read in BP.
		ok &= (fread(&__state.bp, sizeof(__state.bp), 1, in) == 1);
		// Read in dynamic game RAM.
		for (i=0; i<storyStaticMemoryBaseAddress(); i++) {
			ok &= (fread(&b, 1, 1, in) == 1);
			ZPOKE(i, b);
		}
		// Read in stack.
		ok &= (fread(__state.stack, sizeof(__state.stack[0]), __state.sp, in) == __state.sp);

		fclose(in);
	}

	return ok;
}


bool portFileSave(void) {
	FILE     *out;
	bool      ok  = false;
	uint32_t  i;
	byte      b;

	out = fopen("save.dat", "wb");
	if (out) {
		ok = true;

		// Write out PC.
		ok &= (fwrite(&__state.pc, sizeof(__state.pc), 1, out) == 1);
		// Write out SP.
		ok &= (fwrite(&__state.sp, sizeof(__state.sp), 1, out) == 1);
		// Write out BP.
		ok &= (fwrite(&__state.bp, sizeof(__state.bp), 1, out) == 1);
		// Write out dynamic game RAM.
		for (i=0; i<storyStaticMemoryBaseAddress(); i++) {
			b = ZPEEK(i);
			ok &= (fwrite(&b, 1, 1, out) == 1);
		}
		// Write out stack.
		ok &= (fwrite(__state.stack, sizeof(__state.stack[0]), __state.sp, out) == __state.sp);

		fclose(out);
	}

	return ok;
}


void portInput(uint32_t ramAddr, uint8_t length) {
	uint8_t i;
	char    c[2] = { 0, 0 };
	byte    x;
	byte    y;

	for (i=0; i<length; i++) {
		c[0] = getchar();
		// Delete/Backspace.
		if ((c[0] == 8) || (c[0] == 127)) {
			if (i > 0) {
				textGetXY(&x, &y);
				if (x > 0) {
					x--;
				} else {
					x = 0;
					y--;
				}
				textGotoXY(x, y);
				textPrint(" ");
				textGotoXY(x, y);
				i--;
			}
		} else {
			ZPOKE(ramAddr + i, c[0]);
			// Enter/Return.
			if ((c[0] == 13) || (c[0] == 10)) {
				textPrint("\n");
				break;
			}
			textPrint(c);
		}
	}
}


uint16_t portRandomGet(int16_t range) {
	// If range is zero, randomize with "best" random seed.
	// If range is negative, use the positive value to seed.

	if (range == 0) return 0;

	if (range < 0) {
		randomSeed(-range);
		return 0;
	}

	return (randomRead() % range) + 1;
}


void portStoryLoad(void) {

	// Later, we probably want to see if the user has a memory expansion
	// installed.  If they do, we can use it and then use the lower memory
	// for graphics and sound.

	ZPOKE(STORY_SCREEN_WIDTH_CHARACTERS, 80);
	ZPOKE(STORY_SCREEN_HEIGHT_LINES, 30);

	// Currently no status bar.
	ZPOKE(STORY_FLAG_V3, ZPEEK(STORY_FLAG_V3) | STORY_FLAG_V3_STATUS_LINE_NOT_AVAILABLE);

	// Uncomment for status bar and window splitting.
	//POKE(STORY_FLAG_V3, PEEK(STORY_FLAG_V3) & ~STORY_FLAG_V3_STATUS_LINE_NOT_AVAILABLE);
	//POKE(STORY_FLAG_V3, PEEK(STORY_FLAG_V3) | STORY_FLAG_V3_SCREEN_SPLITTING);
}


uint16_t portWordGet(uint16_t address) {
	return SWAP_UINT16(FAR_PEEKW(BASE_ADDRESS + address));
}


void portWordSet(uint16_t address, uint16_t value) {
	FAR_POKEW(BASE_ADDRESS + address, SWAP_UINT16(value));
}


int main(void) {

	f256Init();

	textSetCursor(199);

	stateReset();
	portStoryLoad();
	opcodesSetup();
	storySetup();
	interpreterRun();

	return 0;
}