#include <ncurses.h>
#include "simdata.h"
#include "cpu.h"
#include <stdlib.h>

void drawbox(WINDOW *win,int x0, int y0, int x1, int y1){
	mvwhline(win,y0, x0, 0, x1-x0);
	mvwhline(win,y1, x0, 0, x1-x0);
	mvwvline(win,y0, x0, 0, y1-y0);
	mvwvline(win,y0, x1, 0, y1-y0);
	mvwaddch(win,y0, x0, ACS_ULCORNER);
	mvwaddch(win,y1, x0, ACS_LLCORNER);
	mvwaddch(win,y0, x1, ACS_URCORNER);
	mvwaddch(win,y1, x1, ACS_LRCORNER);
}

int update_internals(WINDOW *win,struct simdata_t *simdata){
	int width,height;
	werase(win);
	getmaxyx(win,height,width);
	box(win, 0 , 0);

	mvwprintw(win,0,width/2-6,"[ INTERNALS ]");

	if(simdata->registers==NULL||simdata->exec_data==NULL){
		mvwprintw(win,1,1,"Data not initialised");
		return 0;
	}

	int graph_height,graph_width;
	switch(simdata->cpu_structure){
		case CPU_STRUCTURE_SIMPLE_PIPELINED:
			graph_height=42;
			graph_width=59;
			break;
		default:
			graph_height=1;
			graph_height=41;
			break;
	}
	int starty,startx,boxwidth;
	starty=height/2-graph_height/2;
	startx=width/2-graph_width/2;

	switch(simdata->cpu_structure){
		case CPU_STRUCTURE_SIMPLE_PIPELINED:
			int fetch_arrow_enter_y;
			int decode_arrow_exit_y;
			boxwidth=50;

			/* FETCH BOX */
			drawbox(win,startx+boxwidth/2-50/2,starty,startx+boxwidth/2-50/2+50,starty+4);
			mvwprintw(win,starty,startx+boxwidth/2-4,"[ FETCH ]");
			starty+=2;
			mvwprintw(win,starty,startx+boxwidth/2-15/2,"wait_for_exec=%d",simdata->fetch_data->wait_for_exec);
			fetch_arrow_enter_y=starty;
			starty+=2;

			/*  -------> */
			mvwaddch(win,starty,startx+boxwidth/2,ACS_TTEE);
			starty++;
			mvwvline(win,starty,startx+boxwidth/2, 0, 2);
			starty+=2;
			mvwaddch(win,starty,startx+boxwidth/2,'V');
			starty+=1;

			starty+=1;

			/* DECODE BOX */
			drawbox(win,startx+boxwidth/2-50/2,starty,startx+boxwidth/2-50/2+50,starty+6);
			mvwprintw(win,starty,startx+boxwidth/2-5,"[ DECODE ]");
			starty+=2;
			mvwprintw(win,starty,startx+boxwidth/2-7/2,"valid=%d",simdata->decode_data->valid);
			decode_arrow_exit_y=starty;
			starty+=2;
			mvwprintw(win,starty,startx+boxwidth/2-41/2,"in_bytecode=0x%08X   address=0x%06X",simdata->decode_data->in_bytecode,simdata->decode_data->address);
			starty+=2;

			/*  -------> */
			mvwaddch(win,starty,startx+boxwidth/2,ACS_TTEE);
			starty++;
			mvwvline(win,starty,startx+boxwidth/2, 0, 2);
			starty+=2;
			mvwaddch(win,starty,startx+boxwidth/2,'V');
			starty+=1;

			starty+=1;

			/* EXECUTE BOX */
			drawbox(win,startx+boxwidth/2-50/2,starty,startx+boxwidth/2-50/2+50,starty+21);
			mvwprintw(win,starty,startx+boxwidth/2-8,"[ EXECUTE UNIT ]");
			starty+=2;
			char *tofree;

			mvwprintw(win,starty,startx+boxwidth/2-41/2,"valid=%d   EXEC_ACTION=%s",simdata->exec_data->valid, (tofree=EXEC_ACTION_t_to_string(simdata->exec_data->EXEC_ACTION)) );
			free(tofree);
			starty+=2;

			mvwprintw(win,starty,startx+boxwidth/2-41/2,"ALU_OP=%s", (tofree=ALU_OP_t_to_string(simdata->exec_data->ALU_OP)) );
			free(tofree);
			starty+=2;

			mvwprintw(win,starty,startx+boxwidth/2-41/2,"COND=%s", (tofree=COND_t_to_string(simdata->exec_data->COND)) );
			free(tofree);
			mvwprintw(win,starty,startx+boxwidth/2-41/2+20,"address=%06X", simdata->exec_data->address);
			starty+=2;

			// Operand boxes
			struct exec_op_t *cur;
			for(int i=0;i<3;i++){
				drawbox(win,startx+boxwidth/2-45/2,starty,startx+boxwidth/2-50/2+45,starty+3);
				wattron(win,A_REVERSE);
				switch(i){
					case 0:
						mvwprintw(win,starty,startx+5," Input operand 1 ");
						cur=simdata->exec_data->in_op1;
						break;
					case 1:
						mvwprintw(win,starty,startx+5," Input operand 2 ");
						cur=simdata->exec_data->in_op2;
						break;
					case 2:
						mvwprintw(win,starty,startx+5," Output operand ");
						cur=simdata->exec_data->out_op;
						break;
				}
				wattroff(win,A_REVERSE);
				starty+=2;
				mvwprintw(win,starty,startx+7,"data=%06X   OP_ADDR=%s",cur->data , (tofree=OP_ADDR_t_to_string(cur->OP_ADDR)) );
				free(tofree);
				starty+=2;
			}

			/* Wait for exec arrow */
			mvwaddch(win,decode_arrow_exit_y,startx+50,ACS_LTEE);
			mvwhline(win,decode_arrow_exit_y,startx+51, 0, 3);
			mvwaddch(win,decode_arrow_exit_y,startx+54,ACS_LRCORNER);
			mvwvline(win,fetch_arrow_enter_y+1,startx+54, 0,decode_arrow_exit_y-fetch_arrow_enter_y-1);
			mvwaddch(win,fetch_arrow_enter_y,startx+54,ACS_URCORNER);
			mvwhline(win,fetch_arrow_enter_y,startx+53, 0, 1);
			mvwaddch(win,fetch_arrow_enter_y,startx+52,'<');
			mvwprintw(win,fetch_arrow_enter_y+(decode_arrow_exit_y-fetch_arrow_enter_y-1)/2-1,startx+55,"Wait");
			mvwprintw(win,fetch_arrow_enter_y+(decode_arrow_exit_y-fetch_arrow_enter_y-1)/2  ,startx+55,"For");
			mvwprintw(win,fetch_arrow_enter_y+(decode_arrow_exit_y-fetch_arrow_enter_y-1)/2+1,startx+55,"Exec");

			break;
		default:
			mvwprintw(win,starty,startx,"No graph available for this cpu structure");
			break;

	}

	if(height==3)
		return 0;
	else
		return 0;
}