#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>

#include "read.h"
#include "part.h"
#include "rpmlib.h"
#include "spec.h"
#include "package.h"
#include "misc.h"
#include "reqprov.h"
#include "parse.h"
#include "popt/popt.h"

static int copyTags[] = {
    RPMTAG_VERSION,
    RPMTAG_RELEASE,
    RPMTAG_COPYRIGHT,
    RPMTAG_PACKAGER,
    RPMTAG_DISTRIBUTION,
    RPMTAG_VENDOR,
    RPMTAG_ICON,
    0
};

static int requiredTags[] = {
    RPMTAG_NAME,
    RPMTAG_VERSION,
    RPMTAG_RELEASE,
    RPMTAG_SUMMARY,
    RPMTAG_GROUP,
    RPMTAG_COPYRIGHT,
/* You really ought to have these, but many people don't: */
/*    RPMTAG_PACKAGER,                                    */
/*    RPMTAG_DISTRIBUTION,                                */
/*    RPMTAG_VENDOR,                                      */
    0
};

static int handlePreambleTag(Spec spec, Package pkg, int tag, char *macro,
			     char *lang);
static void initPreambleList(void);
static int findPreambleTag(Spec spec, int *tag, char **macro, char *lang);
static int checkForRequired(Header h, char *name);
static void copyFromMain(Spec spec, Package pkg);
static int checkForDuplicates(Header h, char *name);
static void fillOutMainPackage(Header h);
static char *tagName(int tag);
static int checkForValidArchitectures(Spec spec);
static int isMemberInEntry(Header header, char *name, int tag);
static int readIcon(Header h, char *file);
    
int parsePreamble(Spec spec, int initialPackage)
{
    int nextPart;
    int tag, rc;
    char *name, *mainName, *linep, *macro;
    int flag;
    Package pkg;
    char fullName[BUFSIZ];
    char lang[BUFSIZ];

    strcpy(fullName, "(main package)");

    pkg = newPackage(spec);
	
    if (! initialPackage) {
	/* There is one option to %package: <pkg> or -n <pkg> */
	if (parseSimplePart(spec->line, &name, &flag)) {
	    rpmError(RPMERR_BADSPEC, "Bad package specification: %s",
		     spec->line);
	    return RPMERR_BADSPEC;
	}
	
	if (!lookupPackage(spec, name, flag, NULL)) {
	    rpmError(RPMERR_BADSPEC, "Package already exists: %s", spec->line);
	    return RPMERR_BADSPEC;
	}
	
	/* Construct the package */
	if (flag == PART_SUBNAME) {
	    headerGetEntry(spec->packages->header, RPMTAG_NAME,
			   NULL, (void *) &mainName, NULL);
	    sprintf(fullName, "%s-%s", mainName, name);
	} else {
	    strcpy(fullName, name);
	}
	headerAddEntry(pkg->header, RPMTAG_NAME, RPM_STRING_TYPE, fullName, 1);
    }

    if ((rc = readLine(spec, STRIP_TRAILINGSPACE | STRIP_COMMENTS)) > 0) {
	nextPart = PART_NONE;
    } else {
	if (rc) {
	    return rc;
	}
	while (! (nextPart = isPart(spec->line))) {
	    /* Skip blank lines */
	    linep = spec->line;
	    SKIPSPACE(linep);
	    if (*linep) {
		if (findPreambleTag(spec, &tag, &macro, lang)) {
		    rpmError(RPMERR_BADSPEC, "line %d: Unknown tag: %s",
			     spec->lineNum, spec->line);
		    return RPMERR_BADSPEC;
		}
		if (handlePreambleTag(spec, pkg, tag, macro, lang)) {
		    return RPMERR_BADSPEC;
		}
		if (spec->buildArchitectures && !spec->inBuildArchitectures) {
		    return PART_BUILDARCHITECTURES;
		}
	    }
	    if ((rc =
		 readLine(spec, STRIP_TRAILINGSPACE | STRIP_COMMENTS)) > 0) {
		nextPart = PART_NONE;
		break;
	    }
	    if (rc) {
		return rc;
	    }
	}
    }

    /* Do some final processing on the header */
    
    if (!spec->gotBuildRoot && spec->buildRoot) {
	rpmError(RPMERR_BADSPEC, "Spec file can't use BuildRoot");
	return RPMERR_BADSPEC;
    }

    if (checkForValidArchitectures(spec)) {
	return RPMERR_BADSPEC;
    }

    if (pkg == spec->packages) {
	fillOutMainPackage(pkg->header);
    }

    if (checkForDuplicates(pkg->header, fullName)) {
	return RPMERR_BADSPEC;
    }

    if (pkg != spec->packages) {
	copyFromMain(spec, pkg);
    }

    if (checkForRequired(pkg->header, fullName)) {
	return RPMERR_BADSPEC;
    }

    return nextPart;
}

static int isMemberInEntry(Header header, char *name, int tag)
{
    char **names;
    int count;

    if (headerGetEntry(header, tag, NULL, (void **)&names, &count)) {
	while (count--) {
	    if (!strcmp(names[count], name)) {
		FREE(names);
		return 1;
	    }
	}
	FREE(names);
	return 0;
    }

    return -1;
}

static int checkForValidArchitectures(Spec spec)
{
    char *arch, *os;

    rpmGetArchInfo(&arch, NULL);
    rpmGetOsInfo(&os, NULL);
    
    if (isMemberInEntry(spec->buildRestrictions,
			arch, RPMTAG_EXCLUDEARCH) == 1) {
	rpmError(RPMERR_BADSPEC, "Architecture is excluded: %s", arch);
	return RPMERR_BADSPEC;
    }
    if (isMemberInEntry(spec->buildRestrictions,
			arch, RPMTAG_EXCLUSIVEARCH) == 0) {
	rpmError(RPMERR_BADSPEC, "Architecture is not included: %s", arch);
	return RPMERR_BADSPEC;
    }
    if (isMemberInEntry(spec->buildRestrictions,
			os, RPMTAG_EXCLUDEOS) == 1) {
	rpmError(RPMERR_BADSPEC, "OS is excluded: %s", os);
	return RPMERR_BADSPEC;
    }
    if (isMemberInEntry(spec->buildRestrictions,
			os, RPMTAG_EXCLUSIVEOS) == 0) {
	rpmError(RPMERR_BADSPEC, "OS is not included: %s", os);
	return RPMERR_BADSPEC;
    }

    return 0;
}

static int checkForRequired(Header h, char *name)
{
    int res = 0;
    int *p = requiredTags;

    while (*p) {
	if (!headerIsEntry(h, *p)) {
	    rpmError(RPMERR_BADSPEC, "%s field must be present in package: %s",
		     tagName(*p), name);
	    res = 1;
	}
	p++;
    }

    return res;
}

static void copyFromMain(Spec spec, Package pkg)
{
    Header headerFrom, headerTo;
    int *p = copyTags;
    char *s;
    int type, count;

    headerFrom = spec->packages->header;
    headerTo = pkg->header;

    while (*p) {
	if (!headerIsEntry(headerTo, *p)) {
	    if (headerGetEntry(headerFrom, *p, &type, (void **) &s, &count)) {
		headerAddEntry(headerTo, *p, type, s, count);
		if (type == RPM_STRING_ARRAY_TYPE) {
		    FREE(s);
		}
	    }
	}
	p++;
    }
}

static int checkForDuplicates(Header h, char *name)
{
    int res = 0;
    int lastTag, tag;
    HeaderIterator hi;
    
    headerSort(h);
    hi = headerInitIterator(h);
    lastTag = 0;
    while (headerNextIterator(hi, &tag, NULL, NULL, NULL)) {
	if (tag == lastTag) {
	    rpmError(RPMERR_BADSPEC, "Duplicate %s entries in package: %s",
		     tagName(tag), name);
	    res = 1;
	}
	lastTag = tag;
    }
    headerFreeIterator(hi);

    return res;
}

static void fillOutMainPackage(Header h)
{
    if (!headerIsEntry(h, RPMTAG_VENDOR)) {
	if (rpmGetVar(RPMVAR_VENDOR)) {
	    headerAddEntry(h, RPMTAG_VENDOR, RPM_STRING_TYPE,
			   rpmGetVar(RPMVAR_VENDOR), 1);
	}
    }
    if (!headerIsEntry(h, RPMTAG_PACKAGER)) {
	if (rpmGetVar(RPMVAR_PACKAGER)) {
	    headerAddEntry(h, RPMTAG_PACKAGER, RPM_STRING_TYPE,
			   rpmGetVar(RPMVAR_PACKAGER), 1);
	}
    }
    if (!headerIsEntry(h, RPMTAG_DISTRIBUTION)) {
	if (rpmGetVar(RPMVAR_DISTRIBUTION)) {
	    headerAddEntry(h, RPMTAG_DISTRIBUTION, RPM_STRING_TYPE,
			   rpmGetVar(RPMVAR_DISTRIBUTION), 1);
	}
    }
}

#define SINGLE_TOKEN_ONLY \
if (multiToken) { \
    rpmError(RPMERR_BADSPEC, "line %d: Tag takes single token only: %s", \
	     spec->lineNum, spec->line); \
    return RPMERR_BADSPEC; \
}

static int handlePreambleTag(Spec spec, Package pkg, int tag, char *macro,
			     char *lang)
{
    char *field = spec->line;
    char *end;
    char **array;
    int multiToken = 0;
    int num, rc, len;
    
    /* Find the start of the "field" and strip trailing space */
    while ((*field) && (*field != ':')) {
	field++;
    }
    if (*field != ':') {
	rpmError(RPMERR_BADSPEC, "line %d: Malformed tag: %s",
		 spec->lineNum, spec->line);
	return RPMERR_BADSPEC;
    }
    field++;
    SKIPSPACE(field);
    if (! *field) {
	/* Empty field */
	rpmError(RPMERR_BADSPEC, "line %d: Empty tag: %s",
		 spec->lineNum, spec->line);
	return RPMERR_BADSPEC;
    }
    end = findLastChar(field);
    *(end+1) = '\0';

    /* See if this is multi-token */
    end = field;
    SKIPNONSPACE(end);
    if (*end) {
	multiToken = 1;
    }

    switch (tag) {
      case RPMTAG_NAME:
      case RPMTAG_VERSION:
      case RPMTAG_RELEASE:
      case RPMTAG_URL:
	SINGLE_TOKEN_ONLY;
      case RPMTAG_GROUP:
	/* These are for backward compatibility */
	if (tag == RPMTAG_VERSION) {
	    addMacro(&spec->macros, "PACKAGE_VERSION", field);
	} else if (tag == RPMTAG_RELEASE) {
	    addMacro(&spec->macros, "PACKAGE_RELEASE", field);
	}
	/* fall through */
      case RPMTAG_SUMMARY:
      case RPMTAG_DISTRIBUTION:
      case RPMTAG_VENDOR:
      case RPMTAG_COPYRIGHT:
      case RPMTAG_PACKAGER:
	if (! *lang) {
	    headerAddEntry(pkg->header, tag, RPM_STRING_TYPE, field, 1);
	} else {
	    headerAddI18NString(pkg->header, tag, field, lang);
	}
	break;
      case RPMTAG_BUILDROOT:
	SINGLE_TOKEN_ONLY;
	if (! spec->buildRoot) {
	    if (rpmGetVar(RPMVAR_BUILDROOT)) {
		spec->buildRoot = rpmGetVar(RPMVAR_BUILDROOT);
	    } else {
		spec->buildRoot = field;
	    }
	    spec->buildRoot = strdup(cleanFileName(spec->buildRoot));
	}
	if (!strcmp(spec->buildRoot, "/")) {
	    rpmError(RPMERR_BADSPEC,
		     "line %d: BuildRoot can not be \"/\": %s",
		     spec->lineNum, spec->line);
	    return RPMERR_BADSPEC;
	}
	spec->gotBuildRoot = 1;
	break;
      case RPMTAG_PREFIXES:
	addOrAppendListEntry(pkg->header, tag, field);
	headerGetEntry(pkg->header, tag, NULL, (void **)&array, &num);
	while (num--) {
	    len = strlen(array[num]);
	    if (array[num][len - 1] == '/') {
		rpmError(RPMERR_BADSPEC,
			 "line %d: Prefixes must not end with \"/\": %s",
			 spec->lineNum, spec->line);
		FREE(array);
		return RPMERR_BADSPEC;
	    }
	}
	FREE(array);
	break;
      case RPMTAG_DOCDIR:
	SINGLE_TOKEN_ONLY;
	FREE(spec->docDir);
	if (field[0] != '/') {
	    rpmError(RPMERR_BADSPEC,
		     "line %d: Docdir must begin with '/': %s",
		     spec->lineNum, spec->line);
	    return RPMERR_BADSPEC;
	}
	spec->docDir = strdup(field);
	break;
      case RPMTAG_SERIAL:
	SINGLE_TOKEN_ONLY;
	if (parseNum(field, &num)) {
	    rpmError(RPMERR_BADSPEC,
		     "line %d: Serial field must be a number: %s",
		     spec->lineNum, spec->line);
	    return RPMERR_BADSPEC;
	}
	headerAddEntry(pkg->header, tag, RPM_INT32_TYPE, &num, 1);
	break;
      case RPMTAG_AUTOREQPROV:
	spec->autoReq = parseYesNo(field);
	spec->autoProv = spec->autoReq;
	break;
      case RPMTAG_AUTOREQ:
	spec->autoReq = parseYesNo(field);
	break;
      case RPMTAG_AUTOPROV:
	spec->autoProv = parseYesNo(field);
	break;
      case RPMTAG_SOURCE:
      case RPMTAG_PATCH:
	SINGLE_TOKEN_ONLY;
	macro = NULL;
	if ((rc = addSource(spec, pkg, field, tag))) {
	    return rc;
	}
	break;
      case RPMTAG_ICON:
	SINGLE_TOKEN_ONLY;
	if ((rc = addSource(spec, pkg, field, tag))) {
	    return rc;
	}
	if ((rc = readIcon(pkg->header, field))) {
	    return RPMERR_BADSPEC;
	}
	break;
      case RPMTAG_NOSOURCE:
      case RPMTAG_NOPATCH:
	spec->noSource = 1;
	if ((rc = parseNoSource(spec, field, tag))) {
	    return rc;
	}
	break;
      case RPMTAG_OBSOLETES:
      case RPMTAG_PROVIDES:
	if ((rc = parseProvidesObsoletes(spec, pkg, field, tag))) {
	    return rc;
	}
	break;
      case RPMTAG_REQUIREFLAGS:
      case RPMTAG_CONFLICTFLAGS:
      case RPMTAG_PREREQ:
	if ((rc = parseRequiresConflicts(spec, pkg, field, tag, 0))) {
	    return rc;
	}
	break;
      case RPMTAG_EXCLUDEARCH:
      case RPMTAG_EXCLUSIVEARCH:
      case RPMTAG_EXCLUDEOS:
      case RPMTAG_EXCLUSIVEOS:
	addOrAppendListEntry(spec->buildRestrictions, tag, field);
	break;
      case RPMTAG_BUILDARCHS:
	if ((rc = poptParseArgvString(field,
				      &(spec->buildArchitectureCount),
				      &(spec->buildArchitectures)))) {
	    rpmError(RPMERR_BADSPEC,
		     "line %d: Bad BuildArchitecture format: %s",
		     spec->lineNum, spec->line);
	    return RPMERR_BADSPEC;
	}
	if (! spec->buildArchitectureCount) {
	    FREE(spec->buildArchitectures);
	}
	break;

      default:
	rpmError(RPMERR_INTERNAL, "Internal error: Bogus tag %d", tag);
	return RPMERR_INTERNAL;
    }

    if (macro) {
	addMacro(&spec->macros, macro, field);
    }
    
    return 0;
}

/* This table has to be in a peculiar order.  If one tag is the */
/* same as another, plus a few letters, it must come first.     */

static struct PreambleRec {
    int tag;
    int len;
    int multiLang;
    char *token;
} preambleList[] = {
    {RPMTAG_NAME,          0, 0, "name"},
    {RPMTAG_VERSION,       0, 0, "version"},
    {RPMTAG_RELEASE,       0, 0, "release"},
    {RPMTAG_SERIAL,        0, 0, "serial"},
/*    {RPMTAG_DESCRIPTION,   0, "description"}, */
    {RPMTAG_SUMMARY,       0, 1, "summary"},
    {RPMTAG_COPYRIGHT,     0, 0, "copyright"},
    {RPMTAG_COPYRIGHT,     0, 0, "license"},
    {RPMTAG_DISTRIBUTION,  0, 0, "distribution"},
    {RPMTAG_VENDOR,        0, 0, "vendor"},
    {RPMTAG_GROUP,         0, 0, "group"},
    {RPMTAG_PACKAGER,      0, 0, "packager"},
    {RPMTAG_URL,           0, 0, "url"},
/*    {RPMTAG_ROOT,          0, "root"}, */
    {RPMTAG_SOURCE,        0, 0, "source"},
    {RPMTAG_PATCH,         0, 0, "patch"},
    {RPMTAG_NOSOURCE,      0, 0, "nosource"},
    {RPMTAG_NOPATCH,       0, 0, "nopatch"},
    {RPMTAG_EXCLUDEARCH,   0, 0, "excludearch"},
    {RPMTAG_EXCLUSIVEARCH, 0, 0, "exclusivearch"},
    {RPMTAG_EXCLUDEOS,     0, 0, "excludeos"},
    {RPMTAG_EXCLUSIVEOS,   0, 0, "exclusiveos"},
/*    {RPMTAG_EXCLUDE,       0, "exclude"}, */
/*    {RPMTAG_EXCLUSIVE,     0, "exclusive"}, */
    {RPMTAG_ICON,          0, 0, "icon"},
    {RPMTAG_PROVIDES,      0, 0, "provides"},
    {RPMTAG_REQUIREFLAGS,  0, 0, "requires"},
    {RPMTAG_PREREQ,        0, 0, "prereq"},
    {RPMTAG_CONFLICTFLAGS, 0, 0, "conflicts"},
    {RPMTAG_OBSOLETES,     0, 0, "obsoletes"},
    {RPMTAG_PREFIXES,      0, 0, "prefixes"},
    {RPMTAG_PREFIXES,      0, 0, "prefix"},
    {RPMTAG_BUILDROOT,     0, 0, "buildroot"},
    {RPMTAG_BUILDARCHS,    0, 0, "buildarchitectures"},
    {RPMTAG_BUILDARCHS,    0, 0, "buildarch"},
    {RPMTAG_AUTOREQPROV,   0, 0, "autoreqprov"},
    {RPMTAG_AUTOREQ,       0, 0, "autoreq"},
    {RPMTAG_AUTOPROV,      0, 0, "autoprov"},
    {RPMTAG_DOCDIR,        0, 0, "docdir"},
    {0, 0, 0, 0}
};

static void initPreambleList(void)
{
    struct PreambleRec *p = preambleList;

    while (p->token) {
	p->len = strlen(p->token);
	p++;
    }
}

static int findPreambleTag(Spec spec, int *tag, char **macro, char *lang)
{
    char *s;
    struct PreambleRec *p = preambleList;

    if (! p->len) {
	initPreambleList();
    }

    while (p->token && strncasecmp(spec->line, p->token, p->len)) {
	p++;
    }

    if (!p->token) {
	return 1;
    }

    s = spec->line + p->len;
    SKIPSPACE(s);

    if (! p->multiLang) {
	/* Unless this is a source or a patch, a ':' better be next */
	if (p->tag != RPMTAG_SOURCE && p->tag != RPMTAG_PATCH) {
	    if (*s != ':') {
		return 1;
	    }
	}
	*lang = '\0';
    } else {
	if (*s != ':') {
	    if (*s != '(') return 1;
	    s++;
	    SKIPSPACE(s);
	    while (! isspace(*s) && *s != ')') {
		*lang++ = *s++;
	    }
	    *lang = '\0';
	    SKIPSPACE(s);
	    if (*s != ')') return 1;
	    s++;
	    SKIPSPACE(s);
	    if (*s != ':') return 1;
	} else {
	    strcpy(lang, RPMBUILD_DEFAULT_LANG);
	}
    }

    *tag = p->tag;
    if (macro) {
	*macro = p->token;
    }
    return 0;
}

static char *tagName(int tag)
{
    int i = 0;
    static char nameBuf[1024];
    char *s;

    strcpy(nameBuf, "(unknown)");
    while (i < rpmTagTableSize) {
	if (tag == rpmTagTable[i].val) {
	    strcpy(nameBuf, rpmTagTable[i].name + 7);
	    s = nameBuf+1;
	    while (*s) {
		*s = tolower(*s);
		s++;
	    }
	}
	i++;
    }

    return nameBuf;
}

static int readIcon(Header h, char *file)
{
    char buf[BUFSIZ], *icon;
    struct stat statbuf;
    int fd;

    sprintf(buf, "%s/%s", rpmGetVar(RPMVAR_SOURCEDIR), file);
    if (stat(buf, &statbuf)) {
	rpmError(RPMERR_BADSPEC, "Unable to read icon: %s", file);
	return RPMERR_BADSPEC;
    }
    icon = malloc(statbuf.st_size);
    fd = open(buf, O_RDONLY);
    if (read(fd, icon, statbuf.st_size) != statbuf.st_size) {
	close(fd);
	rpmError(RPMERR_BADSPEC, "Unable to read icon: %s", file);
	return RPMERR_BADSPEC;
    }
    close(fd);

    if (! strncmp(icon, "GIF", 3)) {
	headerAddEntry(h, RPMTAG_GIF, RPM_BIN_TYPE, icon, statbuf.st_size);
    } else if (! strncmp(icon, "/* XPM", 6)) {
	headerAddEntry(h, RPMTAG_XPM, RPM_BIN_TYPE, icon, statbuf.st_size);
    } else {
	rpmError(RPMERR_BADSPEC, "Unknown icon type: %s", file);
	return RPMERR_BADSPEC;
    }
    free(icon);
    
    return 0;
}