/*
 * $LynxId: LYList.c,v 1.53 2013/10/03 07:46:14 tom Exp $
 *
 *			Lynx Document Reference List Support	      LYList.c
 *			====================================
 *
 *	Author: FM	Foteos Macrides (macrides@sci.wfbr.edu)
 *
 */

#include <HTUtils.h>
#include <HTAlert.h>
#include <LYUtils.h>
#include <GridText.h>
#include <HTParse.h>
#include <LYList.h>
#include <LYMap.h>
#include <LYClean.h>
#include <LYGlobalDefs.h>
#include <LYCharUtils.h>
#include <LYCharSets.h>
#include <LYStrings.h>
#include <LYHistory.h>

#ifdef DIRED_SUPPORT
#include <LYUpload.h>
#include <LYLocal.h>
#endif /* DIRED_SUPPORT */

#include <LYexit.h>
#include <LYLeaks.h>

/*	showlist - F.Macrides (macrides@sci.wfeb.edu)
 *	--------
 *	Create a temporary text/html file with a list of links to
 *	HyperText References in the current document.
 *
 *  On entry
 *	titles		Set:	if we want titles where available
 *			Clear:	we only get addresses.
 */

int showlist(DocInfo *newdoc, int titles)
{
    int cnt;
    int refs, hidden_links;
    int result;
    static char tempfile[LY_MAXPATH];
    static BOOLEAN last_titles = TRUE;
    FILE *fp0;
    char *Address = NULL, *Title = NULL, *cp = NULL;
    char *LinkTitle = NULL;	/* Rel stored as property of link, not of dest */
    BOOLEAN intern_w_post = FALSE;
    const char *desc = "unknown field or link";
    void *helper;

    refs = HText_sourceAnchors(HTMainText);
    hidden_links = HText_HiddenLinkCount(HTMainText);
    if (refs <= 0 && hidden_links > 0 &&
	LYHiddenLinks != HIDDENLINKS_SEPARATE) {
	HTUserMsg(NO_VISIBLE_REFS_FROM_DOC);
	return (-1);
    }
    if (refs <= 0 && hidden_links <= 0) {
	HTUserMsg(NO_REFS_FROM_DOC);
	return (-1);
    }

    if ((fp0 = InternalPageFP(tempfile, titles == last_titles)) == 0)
	return (-1);

    LYLocalFileToURL(&(newdoc->address), tempfile);

    LYRegisterUIPage(newdoc->address,
		     titles ? UIP_LIST_PAGE : UIP_ADDRLIST_PAGE);
    last_titles = (BOOLEAN) titles;
    LYforce_HTML_mode = TRUE;	/* force this file to be HTML */
    LYforce_no_cache = TRUE;	/* force this file to be new */

#ifdef USE_ADDRLIST_PAGE
    if (titles != TRUE)
	BeginInternalPage(fp0, ADDRLIST_PAGE_TITLE, LIST_PAGE_HELP);
    else
#endif
	BeginInternalPage(fp0, LIST_PAGE_TITLE, LIST_PAGE_HELP);

    StrAllocCopy(Address, HTLoadedDocumentURL());
    LYEntify(&Address, FALSE);
    fprintf(fp0, "%s%s<p>\n", gettext("References in "),
	    (non_empty(Address)
	     ? Address
	     : gettext("this document:")));
    FREE(Address);
    if (refs > 0) {
	fprintf(fp0, "<%s compact>\n", ((keypad_mode == NUMBERS_AS_ARROWS) ?
					"ol" : "ul"));
	if (hidden_links > 0)
	    fprintf(fp0, "<lh><em>%s</em>\n", gettext("Visible links:"));
    }
    if (hidden_links > 0) {
	if (LYHiddenLinks == HIDDENLINKS_IGNORE)
	    hidden_links = 0;
    }
    helper = NULL;		/* init */
    result = 1;
    for (cnt = 1; cnt <= refs; cnt++) {
	HTChildAnchor *child = HText_childNextNumber(cnt, &helper);
	int value = HText_findAnchorNumber(helper);
	HTAnchor *dest_intl = NULL;
	HTAnchor *dest;
	HTParentAnchor *parent;
	char *address;
	const char *title;

	if (child == 0) {
	    /*
	     * child should not be 0 unless form field numbering is on and cnt
	     * is the number of a form input field.  HText_FormDescNumber()
	     * will set desc to a description of what type of input field this
	     * is.  We'll list it to ensure that the link numbers on the list
	     * page match the numbering in the original document, but won't
	     * create a forward link to the form.  - FM && LE
	     *
	     * Changed to create a fake hidden link, to get the numbering right
	     * in connection with always treating this file as
	     * HIDDENLINKS_MERGE in GridText.c - kw
	     */
	    if (fields_are_numbered()) {
		HText_FormDescNumber(cnt, &desc);
		fprintf(fp0,
			"<li><a id=%d href=\"#%d\">form field</a> = <em>%s</em>\n",
			cnt, cnt, desc);
	    }
	} else if (value >= result) {
	    if (track_internal_links)
		dest_intl = HTAnchor_followTypedLink(child, HTInternalLink);
	    dest = (dest_intl
		    ? dest_intl
		    : HTAnchor_followLink(child));
	    parent = HTAnchor_parent(dest);
	    if (!intern_w_post && dest_intl &&
		HTMainAnchor &&
		HTMainAnchor->post_data &&
		parent->post_data &&
		BINEQ(HTMainAnchor->post_data, parent->post_data)) {
		/*
		 * Set flag to note that we had at least one internal link, if
		 * the document from which we are generating the list has
		 * associated POST data; after an extra check that the link
		 * destination really has the same POST data so that we can
		 * believe it is an internal link.
		 */
		intern_w_post = TRUE;
	    }
	    address = HTAnchor_address(dest);
	    title = titles ? HTAnchor_title(parent) : NULL;
	    if (dest_intl) {
		HTSprintf0(&LinkTitle, "(internal)");
	    } else if (titles && child->type &&
		       dest == child->dest &&
		       !StrNCmp(HTAtom_name(child->type),
				"RelTitle: ", 10)) {
		HTSprintf0(&LinkTitle, "(%s)", HTAtom_name(child->type) + 10);
	    } else {
		FREE(LinkTitle);
	    }
	    StrAllocCopy(Address, address);
	    FREE(address);
	    LYEntify(&Address, TRUE);
	    if (non_empty(title)) {
		LYformTitle(&Title, title);
		LYEntify(&Title, TRUE);
		if (*Title) {
		    cp = findPoundSelector(Address);
		} else {
		    FREE(Title);
		}
	    }

	    fprintf(fp0, "<li><a href=\"%s\"%s>%s%s%s%s%s</a>\n", Address,
		    dest_intl ? " TYPE=\"internal link\"" : "",
		    NonNull(LinkTitle),
		    ((HTAnchor *) parent != dest) && Title ? "in " : "",
		    (char *) (Title ? Title : Address),
		    (Title && cp) ? " - " : "",
		    (Title && cp) ? (cp + 1) : "");

	    FREE(Address);
	    FREE(Title);
	}
	result = value + 1;
    }
    FREE(LinkTitle);

    if (hidden_links > 0) {
	if (refs > 0)
	    fprintf(fp0, "\n</%s>\n\n<p>\n",
		    ((keypad_mode == NUMBERS_AS_ARROWS) ?
		     "ol" : "ul"));
	fprintf(fp0, "<%s compact>\n", ((keypad_mode == NUMBERS_AS_ARROWS) ?
					"ol continue" : "ul"));
	fprintf(fp0, "<lh><em>%s</em>\n", gettext("Hidden links:"));
    }

    for (cnt = 0; cnt < hidden_links; cnt++) {
	StrAllocCopy(Address, HText_HiddenLinkAt(HTMainText, cnt));
	LYEntify(&Address, FALSE);
	if (isEmpty(Address)) {
	    FREE(Address);
	    continue;
	}
	fprintf(fp0, "<li><a href=\"%s\">%s</a>\n", Address, Address);

	FREE(Address);
    }

    fprintf(fp0, "\n</%s>\n", ((keypad_mode == NUMBERS_AS_ARROWS) ?
			       "ol" : "ul"));
    EndInternalPage(fp0);
    LYCloseTempFP(fp0);

    /*
     * Make necessary changes to newdoc before returning to caller.  If the
     * intern_w_post flag is set, we keep the POST data in newdoc that have
     * been passed in.  They should be the same as in the loaded document for
     * which we generated the list.  In that case the file we have written will
     * be associated with the same POST data when it is loaded after we are
     * done here, so that following one of the links we have marked as
     * "internal link" can lead back to the underlying document with the right
     * address+post_data combination.  - kw
     */
    if (intern_w_post) {
	newdoc->internal_link = TRUE;
    } else {
	LYFreePostData(newdoc);
	newdoc->internal_link = FALSE;
    }
    newdoc->isHEAD = FALSE;
    newdoc->safe = FALSE;
    return (0);
}

static int print_refs(FILE *fp, int titles, int refs)
{
    int result = 0;
    int cnt;
    int value;
    char *address = NULL;
    const char *desc = gettext("unknown field or link");
    void *helper = NULL;	/* init */

    for (cnt = 1; cnt <= refs; cnt++) {
	HTChildAnchor *child = HText_childNextNumber(cnt, &helper);
	HTAnchor *dest;
	HTParentAnchor *parent;
	const char *title;
	int counter = result + 1;

	if (child == 0) {
	    /*
	     * child should not be 0 unless form field numbering is on and
	     * cnt is the number of a form input field. 
	     * HText_FormDescNumber() will set desc to a description of
	     * what type of input field this is.  We'll create a
	     * within-document link to ensure that the link numbers on the
	     * list page match the numbering in the original document, but
	     * won't create a forward link to the form.  - FM && LE
	     */
	    if (fields_are_numbered()) {
		HText_FormDescNumber(cnt, &desc);
		fprintf(fp, "%4d. form field = %s\n", counter, desc);
	    }
	} else {
	    dest = HTAnchor_followLink(child);
	    /*
	     * Ignore if child anchor points to itself, i.e., we had something
	     * like <A NAME=xyz HREF="#xyz"> and it is not treated as a hidden
	     * link.  Useful if someone 'P'rints the List Page (which isn't a
	     * very useful action to do, but anyway...) - kw
	     */
	    if (dest != (HTAnchor *) child) {
		parent = HTAnchor_parent(dest);
		title = titles ? HTAnchor_title(parent) : NULL;
		if (links_are_numbered()) {
		    value = HText_findAnchorNumber(helper);
		    if (value <= result)
			continue;
		    fprintf(fp, "%4d. ", value);
		}
		if (((HTAnchor *) parent != dest) && title) {
		    fprintf(fp, "in ");
		}
		if (title) {
		    fprintf(fp, "%s\n", title);
		} else {
		    address = HTAnchor_short_address(dest);
		    if (LYCharSet_UC[current_char_set].enc == UCT_ENC_UTF8) {
			(void) HTUnEscape(address);
		    }
		    fprintf(fp, "%s\n", address);
		    FREE(address);
		}
	    }
	}
	if (counter > result)
	    result = counter;
#ifdef VMS
	if (HadVMSInterrupt)
	    break;
#endif /* VMS */
    }
    return result;
}

static void print_hidden_refs(FILE *fp, int refs, int hidden_links)
{
    int cnt;
    char *address = NULL;

    fprintf(fp, "%s   %s\n", ((refs > 0) ? "\n" : ""),
	    gettext("Hidden links:"));
    for (cnt = 0; cnt < hidden_links; cnt++) {
	StrAllocCopy(address, HText_HiddenLinkAt(HTMainText, cnt));
	if (isEmpty(address)) {
	    FREE(address);
	    continue;
	}

	if (links_are_numbered())
	    fprintf(fp, "%4d. ", ((cnt + 1) + refs));
	fprintf(fp, "%s\n", address);
	FREE(address);
#ifdef VMS
	if (HadVMSInterrupt)
	    break;
#endif /* VMS */
    }
}

/*	printlist - F.Macrides (macrides@sci.wfeb.edu)
 *	---------
 *	Print a text/plain list of HyperText References
 *	in the current document.
 *
 *  On entry
 *	titles		Set:	if we want titles where available
 *			Clear:	we only get addresses.
 */
void printlist(FILE *fp, int titles)
{
    int refs, hidden_links;

    refs = HText_sourceAnchors(HTMainText);
    if (refs > 0 || LYHiddenLinks == HIDDENLINKS_SEPARATE) {
	hidden_links = HText_HiddenLinkCount(HTMainText);
	if (refs > 0 || hidden_links > 0) {
	    if (links_are_numbered() || fields_are_numbered())
		fprintf(fp, "\n%s\n\n", gettext("References"));
	    if (LYHiddenLinks == HIDDENLINKS_IGNORE)
		hidden_links = 0;
	    if (hidden_links > 0) {
		fprintf(fp, "   %s\n", gettext("Visible links"));
	    }
	    refs = print_refs(fp, titles, refs) + 1;

	    if (hidden_links > 0) {
		print_hidden_refs(fp, refs, hidden_links);
	    }
	}
    }
    LYPrintImgMaps(fp);
    return;
}