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#include <atari.h>
#include <string.h>
#include <ctype.h>
#include "addrs.h"
#include "edbox.h"
#include "screen.h"
#include "irc.h"

#define COMP_S1   1
#define COMP_PM   2
#define COMP_CHAN 3

#define MAX_PM_NICKS 10

static char search_pos = 0, in_progress = 0;
static char prefix[33];

char comp_pm_nicks[MAX_PM_NICKS][25];
char comp_pm_chans[MAX_PM_NICKS][25];
char (*list)[25] = comp_pm_nicks;
char (*add_to)[25] = comp_pm_nicks;

static char pm_nick_pos = 0; /* insertion point for _add() */

static void add_list(const char *n) {
	int i;

	for(i = 0; i < 25; i++)
		if(strncmp(n, add_to[i], 24) == 0)
			return; /* we already got this one */

	strncpy(add_to[pm_nick_pos], n, 24);
	pm_nick_pos++;
	pm_nick_pos %= MAX_PM_NICKS;
}

void comp_add_pm_nick(const char *n) {
	add_to = comp_pm_nicks;
	add_list(n);
}

void comp_add_pm_chan(const char *n) {
	add_to = comp_pm_chans;
	add_list(n);
}

char match(const char *p, const char *q) {
	int len;

	while(*p == '#') p++;
	while(*q == '#') q++;

	len = strlen(p);
	if(!len) return 0;

	while(len--) {
		if(tolower(*p) != tolower(*q))
			return 0;
		p++, q++;
	}
	return 1;
}

void comp_complete_done(void) {
	in_progress = 0;
}

void comp_continue(void) {
	search_pos %= MAX_PM_NICKS;
	while(search_pos < MAX_PM_NICKS) {
		if(match(prefix, list[search_pos])) {
			edbox_set(list[search_pos]);
			edbox_space();
			search_pos++;
			return;
		}
		search_pos++;
	}
	edbox_set(prefix); /* no space here */
	comp_complete_done();
}

void comp_start(void) {
	char *p;

	if(scr_current == SCR_SERVER) {
		p = last_chan;
		list = comp_pm_chans;
	} else if(scr_current == SCR_PRIV) {
		p = last_pm_nick;
		list = comp_pm_nicks;
	} else {
		/* channel screens not yet supported */
		return;
	}

	/* just insert the last nick/chan if there's nothing to search for */
	if(!edbox_len) {
		if(*p) {
			edbox_set(p);
			edbox_space();
		}
	} else {
		in_progress = COMP_PM;
		search_pos = 0;
		strncpy(prefix, edit_box, 24);
		comp_continue();
	}
}

void comp_complete(void) {
	if(in_progress)
		comp_continue();
	else
		comp_start();
}