#include <stdio.h>

#include <import/lru.h>
#include <haproxy/api.h>
#include <haproxy/arg.h>
#include <haproxy/buf-t.h>
#include <haproxy/cfgparse.h>
#include <haproxy/chunk.h>
#include <haproxy/errors.h>
#include <haproxy/global.h>
#include <haproxy/http_ana.h>
#include <haproxy/http_fetch.h>
#include <haproxy/http_htx.h>
#include <haproxy/htx.h>
#include <haproxy/sample.h>
#include <haproxy/thread.h>
#include <haproxy/tools.h>
#include <haproxy/xxhash.h>

#ifdef USE_51DEGREES_V4
#include <hash/hash.h>
#undef MAP_TYPE
#include <hash/fiftyone.h>
#else
#include <51Degrees.h>
#endif

struct _51d_property_names {
	struct list list;
	char *name;
};

#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
static struct lru64_head *_51d_lru_tree = NULL;
static unsigned long long _51d_lru_seed;

__decl_spinlock(_51d_lru_lock);
#endif

#ifdef FIFTYONE_DEGREES_HASH_INCLUDED
#define _51D_HEADERS_BUFFER_SIZE BUFSIZE

static THREAD_LOCAL struct {
	char **buf;
	int max;
	int count;
} _51d_headers;

static THREAD_LOCAL fiftyoneDegreesResultsHash *_51d_results = NULL;
#endif

static struct {
	char property_separator;    /* the separator to use in the response for the values. this is taken from 51degrees-property-separator from config. */
	struct list property_names; /* list of properties to load into the data set. this is taken from 51degrees-property-name-list from config. */
	char *data_file_path;
#if defined(FIFTYONEDEGREES_H_PATTERN_INCLUDED) || defined(FIFTYONEDEGREES_H_TRIE_INCLUDED)
	int header_count; /* number of HTTP headers related to device detection. */
	struct buffer *header_names; /* array of HTTP header names. */
	fiftyoneDegreesDataSet data_set; /* data set used with the pattern and trie detection methods. */
#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
	fiftyoneDegreesWorksetPool *pool; /* pool of worksets to avoid creating a new one for each request. */
#endif
#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
	int32_t *header_offsets; /* offsets to the HTTP header name string. */
#ifdef FIFTYONEDEGREES_NO_THREADING
	fiftyoneDegreesDeviceOffsets device_offsets; /* Memory used for device offsets. */
#endif
#endif
#elif defined(FIFTYONE_DEGREES_HASH_INCLUDED)
	fiftyoneDegreesResourceManager manager;
	int use_perf_graph;
	int use_pred_graph;
	int drift;
	int difference;
	int allow_unmatched;
#endif
	int cache_size;
} global_51degrees = {
	.property_separator = ',',
	.property_names = LIST_HEAD_INIT(global_51degrees.property_names),
	.data_file_path = NULL,
#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
	.data_set = { },
#endif
#ifdef FIFTYONE_DEGREES_HASH_INCLUDED
	.manager = { },
	.use_perf_graph = -1,
	.use_pred_graph = -1,
	.drift = -1,
	.difference = -1,
	.allow_unmatched = -1,
#endif
	.cache_size = 0,
};

static int _51d_data_file(char **args, int section_type, struct proxy *curpx,
                          const struct proxy *defpx, const char *file, int line,
                          char **err)
{
	if (*(args[1]) == 0) {
		memprintf(err,
		          "'%s' expects a filepath to a 51Degrees trie or pattern data file.",
		          args[0]);
		return -1;
	}

	if (global_51degrees.data_file_path)
		free(global_51degrees.data_file_path);
	global_51degrees.data_file_path = strdup(args[1]);

	return 0;
}

static int _51d_property_name_list(char **args, int section_type, struct proxy *curpx,
                                   const struct proxy *defpx, const char *file, int line,
                                   char **err)
{
	int cur_arg = 1;
	struct _51d_property_names *name;

	if (*(args[cur_arg]) == 0) {
		memprintf(err,
		          "'%s' expects at least one 51Degrees property name.",
		          args[0]);
		return -1;
	}

	while (*(args[cur_arg])) {
		name = calloc(1, sizeof(*name));
		name->name = strdup(args[cur_arg]);
		LIST_APPEND(&global_51degrees.property_names, &name->list);
		++cur_arg;
	}

	return 0;
}

static int _51d_property_separator(char **args, int section_type, struct proxy *curpx,
                                   const struct proxy *defpx, const char *file, int line,
                                   char **err)
{
	if (*(args[1]) == 0) {
		memprintf(err,
		          "'%s' expects a single character.",
		          args[0]);
		return -1;
	}
	if (strlen(args[1]) > 1) {
		memprintf(err,
		          "'%s' expects a single character, got '%s'.",
		          args[0], args[1]);
		return -1;
	}

	global_51degrees.property_separator = *args[1];

	return 0;
}

static int _51d_cache_size(char **args, int section_type, struct proxy *curpx,
                           const struct proxy *defpx, const char *file, int line,
                           char **err)
{
	if (*(args[1]) == 0) {
		memprintf(err,
		          "'%s' expects a positive numeric value.",
		          args[0]);
		return -1;
	}

	global_51degrees.cache_size = atoi(args[1]);
	if (global_51degrees.cache_size < 0) {
		memprintf(err,
		          "'%s' expects a positive numeric value, got '%s'.",
		          args[0], args[1]);
		return -1;
	}

	return 0;
}

static int _51d_fetch_check(struct arg *arg, char **err_msg)
{
	if (global_51degrees.data_file_path)
		return 1;

	memprintf(err_msg, "51Degrees data file is not specified (parameter '51degrees-data-file')");
	return 0;
}

static int _51d_conv_check(struct arg *arg, struct sample_conv *conv,
                           const char *file, int line, char **err_msg)
{
	if (global_51degrees.data_file_path)
		return 1;

	memprintf(err_msg, "51Degrees data file is not specified (parameter '51degrees-data-file')");
	return 0;
}

#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
static void _51d_lru_free(void *cache_entry)
{
	struct buffer *ptr = cache_entry;

	if (!ptr)
		return;

	free(ptr->area);
	free(ptr);
}

/* Allocates memory freeing space in the cache if necessary.
*/
static void *_51d_malloc(int size)
{
	void *ptr = malloc(size);

	if (!ptr) {
		/* free the oldest 10 entries from lru to free up some memory
		 * then try allocating memory again */
		lru64_kill_oldest(_51d_lru_tree, 10);
		ptr = malloc(size);
	}

	return ptr;
}

/* Insert the data associated with the sample into the cache as a fresh item.
 */
static void _51d_insert_cache_entry(struct sample *smp, struct lru64 *lru, void* domain)
{
	struct buffer *cache_entry = _51d_malloc(sizeof(*cache_entry));

	if (!cache_entry)
		return;

	cache_entry->area = _51d_malloc(smp->data.u.str.data + 1);
	if (!cache_entry->area) {
		free(cache_entry);
		return;
	}

	memcpy(cache_entry->area, smp->data.u.str.area, smp->data.u.str.data);
	cache_entry->area[smp->data.u.str.data] = 0;
	cache_entry->data = smp->data.u.str.data;
	HA_SPIN_LOCK(OTHER_LOCK, &_51d_lru_lock);
	lru64_commit(lru, cache_entry, domain, 0, _51d_lru_free);
	HA_SPIN_UNLOCK(OTHER_LOCK, &_51d_lru_lock);
}

/* Retrieves the data from the cache and sets the sample data to this string.
 */
static void _51d_retrieve_cache_entry(struct sample *smp, struct lru64 *lru)
{
	struct buffer *cache_entry = lru->data;
	smp->data.u.str.area = cache_entry->area;
	smp->data.u.str.data = cache_entry->data;
}
#endif

#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
/* Sets the important HTTP headers ahead of the detection
 */
static void _51d_set_headers(struct sample *smp, fiftyoneDegreesWorkset *ws)
{
	struct channel *chn;
	struct htx *htx;
	struct http_hdr_ctx ctx;
	struct ist name;
	int i;

	ws->importantHeadersCount = 0;
	chn = (smp->strm ? &smp->strm->req : NULL);

	// No need to null check as this has already been carried out in the
	// calling method
	htx = smp_prefetch_htx(smp, chn, NULL, 1);
	ALREADY_CHECKED(htx);

	for (i = 0; i < global_51degrees.header_count; i++) {
		name = ist2((global_51degrees.header_names + i)->area,
			    (global_51degrees.header_names + i)->data);
		ctx.blk = NULL;

		if (http_find_header(htx, name, &ctx, 1)) {
			ws->importantHeaders[ws->importantHeadersCount].header = ws->dataSet->httpHeaders + i;
			ws->importantHeaders[ws->importantHeadersCount].headerValue = ctx.value.ptr;
			ws->importantHeaders[ws->importantHeadersCount].headerValueLength = ctx.value.len;
			ws->importantHeadersCount++;
		}
	}
}
#endif

#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
static void _51d_init_device_offsets(fiftyoneDegreesDeviceOffsets *offsets) {
	int i;
	for (i = 0; i < global_51degrees.data_set.uniqueHttpHeaders.count; i++) {
		offsets->firstOffset[i].userAgent = NULL;
	}
}

static void _51d_set_device_offsets(struct sample *smp, fiftyoneDegreesDeviceOffsets *offsets)
{
	struct channel *chn;
	struct htx *htx;
	struct http_hdr_ctx ctx;
	struct ist name;
	int i;

	offsets->size = 0;
	chn = (smp->strm ? &smp->strm->req : NULL);

	// No need to null check as this has already been carried out in the
	// calling method
	htx = smp_prefetch_htx(smp, chn, NULL, 1);
	ALREADY_CHECKED(htx);

	for (i = 0; i < global_51degrees.header_count; i++) {
		name = ist2((global_51degrees.header_names + i)->area,
			    (global_51degrees.header_names + i)->data);
		ctx.blk = NULL;

		if (http_find_header(htx, name, &ctx, 1)) {
			(offsets->firstOffset + offsets->size)->httpHeaderOffset = *(global_51degrees.header_offsets + i);
			(offsets->firstOffset + offsets->size)->deviceOffset = fiftyoneDegreesGetDeviceOffset(&global_51degrees.data_set, ctx.value.ptr);
			offsets->size++;
		}
	}

}
#endif

#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
/* Provides a hash code for the important HTTP headers.
 */
unsigned long long _51d_req_hash(const struct arg *args, fiftyoneDegreesWorkset* ws)
{
	unsigned long long seed = _51d_lru_seed ^ (long)args;
	unsigned long long hash = 0;
	int i;
	for(i = 0; i < ws->importantHeadersCount; i++) {
		hash ^= ws->importantHeaders[i].header->headerNameOffset;
		hash ^= XXH3(ws->importantHeaders[i].headerValue,
		             ws->importantHeaders[i].headerValueLength,
		             seed);
	}
	return hash;
}
#endif

#ifdef FIFTYONE_DEGREES_HASH_INCLUDED
static int _51d_use_perf_graph(char **args, int section_type, struct proxy *curpx,
                               const struct proxy *defpx, const char *file, int line,
                               char **err)
{
	if (too_many_args(1, args, err, NULL))
		return -1;

	if (strcmp(args[1], "on") == 0)
		global_51degrees.use_perf_graph = 1;
	else if (strcmp(args[1], "off") == 0)
		global_51degrees.use_perf_graph = 0;
	else {
		memprintf(err, "'%s' expects either 'on' or 'off' but got '%s'.", args[0], args[1]);
		return -1;
	}

	return 0;
}

static int _51d_use_pred_graph(char **args, int section_type, struct proxy *curpx,
                               const struct proxy *defpx, const char *file, int line,
                               char **err)
{
	if (too_many_args(1, args, err, NULL))
		return -1;

	if (strcmp(args[1], "on") == 0)
		global_51degrees.use_pred_graph = 1;
	else if (strcmp(args[1], "off") == 0)
		global_51degrees.use_pred_graph = 0;
	else {
		memprintf(err, "'%s' expects either 'on' or 'off' but got '%s'.", args[0], args[1]);
		return -1;
	}

	return 0;
}

static int _51d_drift(char **args, int section_type, struct proxy *curpx,
                      const struct proxy *defpx, const char *file, int line,
                      char **err)
{
	if (*(args[1]) == 0) {
		memprintf(err, "'%s' expects a positive numeric value.", args[0]);
		return -1;
	}

	global_51degrees.drift = atoi(args[1]);
	if (global_51degrees.drift < 0) {
		memprintf(err, "'%s' expects a positive numeric value, got '%s'.",
		          args[0], args[1]);
		return -1;
	}

	return 0;
}

static int _51d_difference(char **args, int section_type, struct proxy *curpx,
                           const struct proxy *defpx, const char *file, int line,
                           char **err)
{
	if (*(args[1]) == 0) {
		memprintf(err, "'%s' expects a positive numeric value.", args[0]);
		return -1;
	}

	global_51degrees.difference = atoi(args[1]);
	if (global_51degrees.difference < 0) {
		memprintf(err, "'%s' expects a positive numeric value, got '%s'.",
		          args[0], args[1]);
		return -1;
	}

	return 0;
}

static int _51d_allow_unmatched(char **args, int section_type, struct proxy *curpx,
                                const struct proxy *defpx, const char *file, int line,
                                char **err)
{
	if (too_many_args(1, args, err, NULL))
		return -1;

	if (strcmp(args[1], "on") == 0)
		global_51degrees.allow_unmatched = 1;
	else if (strcmp(args[1], "off") == 0)
		global_51degrees.allow_unmatched = 0;
	else {
		memprintf(err, "'%s' expects either 'on' or 'off' but got '%s'.", args[0], args[1]);
		return -1;
	}

	return 0;
}

static int _51d_init_internal()
{
	fiftyoneDegreesDataSetHash *ds;
	int hdr_count;
	int i, ret = 0;

	ds = (fiftyoneDegreesDataSetHash *)fiftyoneDegreesDataSetGet(&global_51degrees.manager);

	hdr_count = ds->b.b.uniqueHeaders->count;
	if (hdr_count > _51d_headers.max)
		hdr_count = _51d_headers.max;

	_51d_results = fiftyoneDegreesResultsHashCreate(&global_51degrees.manager, hdr_count, 0);
	if (!_51d_results)
		goto out;

	for (i = 0; i < hdr_count; i++) {
		_51d_headers.buf[i] = malloc(_51D_HEADERS_BUFFER_SIZE);
		if (!_51d_headers.buf[i])
			goto out;
		_51d_headers.count++;
	}

	/* success */
	ret = 1;

out:
	fiftyoneDegreesDataSetRelease((fiftyoneDegreesDataSetBase *)ds);
	return ret;
}

static fiftyoneDegreesEvidenceKeyValuePairArray * _51d_get_evidence(struct sample *smp)
{
	fiftyoneDegreesEvidenceKeyValuePairArray *evidence;
	fiftyoneDegreesDataSetHash *ds;
	size_t size;
	struct channel *chn;
	struct htx *htx;
	struct http_hdr_ctx ctx;
	struct ist name;
	int i;

	chn = (smp->strm ? &smp->strm->req : NULL);

	// No need to null check as this has already been carried out in the
	// calling method
	htx = smp_prefetch_htx(smp, chn, NULL, 1);
	ALREADY_CHECKED(htx);

	ds = (fiftyoneDegreesDataSetHash *)_51d_results->b.b.dataSet;
	size = _51d_headers.count * 2;

	evidence = fiftyoneDegreesEvidenceCreate(size);
	if (!evidence)
		return NULL;

	for (i = 0; i < _51d_headers.count; i++) {
		fiftyoneDegreesHeader *hdr = &ds->b.b.uniqueHeaders->items[i];
		name = ist2(hdr->name, hdr->nameLength);
		ctx.blk = NULL;

		if (http_find_header(htx, name, &ctx, 1)) {
			size_t len = ctx.value.len;

			if (unlikely(len >= _51D_HEADERS_BUFFER_SIZE))
				len = _51D_HEADERS_BUFFER_SIZE - 1;

			memcpy(_51d_headers.buf[i], ctx.value.ptr, len);
			_51d_headers.buf[i][len] = '\0';

			fiftyoneDegreesEvidenceAddString(
				evidence,
				FIFTYONE_DEGREES_EVIDENCE_HTTP_HEADER_STRING,
				name.ptr,
				_51d_headers.buf[i]);
		}
	}

	return evidence;
}
#endif

#if defined(FIFTYONEDEGREES_H_PATTERN_INCLUDED) || defined(FIFTYONEDEGREES_H_TRIE_INCLUDED)
#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
static void _51d_process_match(const struct arg *args, struct sample *smp, fiftyoneDegreesWorkset* ws)
{
	char *methodName;
#endif
#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
static void _51d_process_match(const struct arg *args, struct sample *smp, fiftyoneDegreesDeviceOffsets *offsets)
{
	char valuesBuffer[1024];
	const char **requiredProperties = fiftyoneDegreesGetRequiredPropertiesNames(&global_51degrees.data_set);
	int requiredPropertiesCount = fiftyoneDegreesGetRequiredPropertiesCount(&global_51degrees.data_set);
#endif
	const char* property_name;
	int j;

#elif defined(FIFTYONE_DEGREES_HASH_INCLUDED)
static void _51d_process_match(const struct arg *args, struct sample *smp)
{
	char valuesBuffer[1024];
#endif

	char no_data[] = "NoData";  /* response when no data could be found */
	struct buffer *temp = get_trash_chunk();
	int i = 0, found;

#if defined(FIFTYONE_DEGREES_HASH_INCLUDED)
	FIFTYONE_DEGREES_EXCEPTION_CREATE;
#endif

	/* Loop through property names passed to the filter and fetch them from the dataset. */
	while (args[i].data.str.area) {
		/* Try to find request property in dataset. */
		found = 0;
#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
		if (strcmp("Method", args[i].data.str.area) == 0) {
			switch(ws->method) {
				case EXACT: methodName = "Exact"; break;
				case NUMERIC: methodName = "Numeric"; break;
				case NEAREST: methodName = "Nearest"; break;
				case CLOSEST: methodName = "Closest"; break;
				default:
				case NONE: methodName = "None"; break;
			}
			chunk_appendf(temp, "%s", methodName);
			found = 1;
		}
		else if (strcmp("Difference", args[i].data.str.area) == 0) {
			chunk_appendf(temp, "%d", ws->difference);
			found = 1;
		}
		else if (strcmp("Rank", args[i].data.str.area) == 0) {
			chunk_appendf(temp, "%d", fiftyoneDegreesGetSignatureRank(ws));
			found = 1;
		}
		else {
			for (j = 0; j < ws->dataSet->requiredPropertyCount; j++) {
				property_name = fiftyoneDegreesGetPropertyName(ws->dataSet, ws->dataSet->requiredProperties[j]);
				if (strcmp(property_name, args[i].data.str.area) == 0) {
					found = 1;
					fiftyoneDegreesSetValues(ws, j);
					chunk_appendf(temp, "%s", fiftyoneDegreesGetValueName(ws->dataSet, *ws->values));
					break;
				}
			}
		}
#endif
#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
		found = 0;
		for (j = 0; j < requiredPropertiesCount; j++) {
			property_name = requiredProperties[j];
			if (strcmp(property_name, args[i].data.str.area) == 0 &&
				fiftyoneDegreesGetValueFromOffsets(&global_51degrees.data_set, offsets, j, valuesBuffer, 1024) > 0) {
				found = 1;
				chunk_appendf(temp, "%s", valuesBuffer);
				break;
			}
		}
#endif
#ifdef FIFTYONE_DEGREES_HASH_INCLUDED
		FIFTYONE_DEGREES_EXCEPTION_CLEAR;

		found = fiftyoneDegreesResultsHashGetValuesString(
			_51d_results, args[i].data.str.area,
			valuesBuffer, 1024, "|",
			exception);

		if (FIFTYONE_DEGREES_EXCEPTION_FAILED || found <= 0)
			found = 0;
		else
			chunk_appendf(temp, "%s", valuesBuffer);
#endif
		if (!found)
			chunk_appendf(temp, "%s", no_data);

		/* Add separator. */
		chunk_appendf(temp, "%c", global_51degrees.property_separator);
		++i;
	}

	if (temp->data) {
		--temp->data;
		temp->area[temp->data] = '\0';
	}

	smp->data.u.str.area = temp->area;
	smp->data.u.str.data = temp->data;
}

/* Sets the sample data as a constant string. This ensures that the
 * string will be processed correctly.
 */
static void _51d_set_smp(struct sample *smp)
{
	/*
	 * Data type has to be set to ensure the string output is processed
	 * correctly.
	 */
	smp->data.type = SMP_T_STR;

	/* Flags the sample to show it uses constant memory. */
	smp->flags |= SMP_F_CONST;
}

static int _51d_fetch(const struct arg *args, struct sample *smp, const char *kw, void *private)
{
	struct channel *chn;
	struct htx *htx;
#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
	fiftyoneDegreesWorkset* ws; /* workset for detection */
	struct lru64 *lru = NULL;
#endif
#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
	fiftyoneDegreesDeviceOffsets *offsets; /* Offsets for detection */
#endif
#ifdef FIFTYONE_DEGREES_HASH_INCLUDED
	fiftyoneDegreesEvidenceKeyValuePairArray *evidence = NULL;
	FIFTYONE_DEGREES_EXCEPTION_CREATE;
#endif

	chn = (smp->strm ? &smp->strm->req : NULL);
	htx = smp_prefetch_htx(smp, chn, NULL, 1);
	if (!htx)
		return 0;


#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED

	/* Get only the headers needed for device detection so they can be used
	 * with the cache to return previous results. Pattern is slower than
	 * Trie so caching will help improve performance.
	 */

	/* Get a workset from the pool which will later contain detection results. */
	ws = fiftyoneDegreesWorksetPoolGet(global_51degrees.pool);
	if (!ws)
		return 0;

	/* Set the important HTTP headers for this request in the workset. */
	_51d_set_headers(smp, ws);

	/* Check the cache to see if there's results for these headers already. */
	if (_51d_lru_tree) {
		HA_SPIN_LOCK(OTHER_LOCK, &_51d_lru_lock);

		lru = lru64_get(_51d_req_hash(args, ws),
		                _51d_lru_tree, (void*)args, 0);

		if (lru && lru->domain) {
			fiftyoneDegreesWorksetPoolRelease(global_51degrees.pool, ws);
			_51d_retrieve_cache_entry(smp, lru);
			HA_SPIN_UNLOCK(OTHER_LOCK, &_51d_lru_lock);

			_51d_set_smp(smp);
			return 1;
		}
		HA_SPIN_UNLOCK(OTHER_LOCK, &_51d_lru_lock);
	}

	fiftyoneDegreesMatchForHttpHeaders(ws);

	_51d_process_match(args, smp, ws);

#endif

#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
#ifndef FIFTYONEDEGREES_NO_THREADING
	offsets = fiftyoneDegreesCreateDeviceOffsets(&global_51degrees.data_set);
	_51d_init_device_offsets(offsets);
#else
	offsets = &global_51degrees.device_offsets;
#endif

	/* Trie is very fast so all the headers can be passed in and the result
	 * returned faster than the hashing algorithm process.
	 */
	_51d_set_device_offsets(smp, offsets);
	_51d_process_match(args, smp, offsets);

#ifndef FIFTYONEDEGREES_NO_THREADING
	fiftyoneDegreesFreeDeviceOffsets(offsets);
#endif

#endif

#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
	fiftyoneDegreesWorksetPoolRelease(global_51degrees.pool, ws);
	if (lru)
		_51d_insert_cache_entry(smp, lru, (void*)args);
#endif

#ifdef FIFTYONE_DEGREES_HASH_INCLUDED
	evidence = _51d_get_evidence(smp);
	if (!evidence)
		return 0;

	fiftyoneDegreesResultsHashFromEvidence(
		_51d_results, evidence, exception);
	fiftyoneDegreesEvidenceFree(evidence);

	if (FIFTYONE_DEGREES_EXCEPTION_FAILED)
		return 0;

	_51d_process_match(args, smp);
#endif

	_51d_set_smp(smp);
	return 1;
}

static int _51d_conv(const struct arg *args, struct sample *smp, void *private)
{
#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
	fiftyoneDegreesWorkset* ws; /* workset for detection */
	struct lru64 *lru = NULL;
#endif
#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
	fiftyoneDegreesDeviceOffsets *offsets; /* Offsets for detection */
#endif
#ifdef FIFTYONE_DEGREES_HASH_INCLUDED
	FIFTYONE_DEGREES_EXCEPTION_CREATE;
#endif

#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED

	/* Look in the list. */
	if (_51d_lru_tree) {
		unsigned long long seed = _51d_lru_seed ^ (long)args;

		HA_SPIN_LOCK(OTHER_LOCK, &_51d_lru_lock);
		lru = lru64_get(XXH3(smp->data.u.str.area, smp->data.u.str.data, seed),
		                _51d_lru_tree, (void*)args, 0);
		if (lru && lru->domain) {
			_51d_retrieve_cache_entry(smp, lru);
			HA_SPIN_UNLOCK(OTHER_LOCK, &_51d_lru_lock);
			return 1;
		}
		HA_SPIN_UNLOCK(OTHER_LOCK, &_51d_lru_lock);
	}

	/* Create workset. This will later contain detection results. */
	ws = fiftyoneDegreesWorksetPoolGet(global_51degrees.pool);
	if (!ws)
		return 0;
#endif

	/* Duplicate the data and remove the "const" flag before device detection. */
	if (!smp_dup(smp))
		return 0;

	smp->data.u.str.area[smp->data.u.str.data] = '\0';

	/* Perform detection. */
#if defined(FIFTYONEDEGREES_H_PATTERN_INCLUDED) || defined(FIFTYONEDEGREES_H_TRIE_INCLUDED)
#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
	fiftyoneDegreesMatch(ws, smp->data.u.str.area);
	_51d_process_match(args, smp, ws);
#endif
#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
#ifndef FIFTYONEDEGREES_NO_THREADING
	offsets = fiftyoneDegreesCreateDeviceOffsets(&global_51degrees.data_set);
	_51d_init_device_offsets(offsets);
#else
	offsets = &global_51degrees.device_offsets;
#endif

	offsets->firstOffset->deviceOffset = fiftyoneDegreesGetDeviceOffset(&global_51degrees.data_set,
	                                                                    smp->data.u.str.area);
	offsets->size = 1;
	_51d_process_match(args, smp, offsets);
#endif

#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
	fiftyoneDegreesWorksetPoolRelease(global_51degrees.pool, ws);
	if (lru)
		_51d_insert_cache_entry(smp, lru, (void*)args);
#endif

#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
#ifndef FIFTYONEDEGREES_NO_THREADING
	fiftyoneDegreesFreeDeviceOffsets(offsets);
#endif
#endif

#elif defined(FIFTYONE_DEGREES_HASH_INCLUDED)
	fiftyoneDegreesResultsHashFromUserAgent(_51d_results, smp->data.u.str.area,
	                                        smp->data.u.str.data, exception);
	if (FIFTYONE_DEGREES_EXCEPTION_FAILED)
		return 0;

	_51d_process_match(args, smp);
#endif

	_51d_set_smp(smp);
	return 1;
}

#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
void _51d_init_http_headers()
{
	int index = 0;
	const fiftyoneDegreesAsciiString *headerName;
	fiftyoneDegreesDataSet *ds = &global_51degrees.data_set;
	global_51degrees.header_count = ds->httpHeadersCount;
	global_51degrees.header_names = malloc(global_51degrees.header_count * sizeof(struct buffer));
	for (index = 0; index < global_51degrees.header_count; index++) {
		headerName = fiftyoneDegreesGetString(ds, ds->httpHeaders[index].headerNameOffset);
		(global_51degrees.header_names + index)->area = (char*)&headerName->firstByte;
		(global_51degrees.header_names + index)->data = headerName->length - 1;
		(global_51degrees.header_names + index)->size = (global_51degrees.header_names + index)->data;
	}
}
#endif

#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
void _51d_init_http_headers()
{
	int index = 0;
	fiftyoneDegreesDataSet *ds = &global_51degrees.data_set;
	global_51degrees.header_count = fiftyoneDegreesGetHttpHeaderCount(ds);
#ifdef FIFTYONEDEGREES_NO_THREADING
	global_51degrees.device_offsets.firstOffset = malloc(
		global_51degrees.header_count * sizeof(fiftyoneDegreesDeviceOffset));
	_51d_init_device_offsets(&global_51degrees.device_offsets);
#endif
	global_51degrees.header_names = malloc(global_51degrees.header_count * sizeof(struct buffer));
	global_51degrees.header_offsets = malloc(global_51degrees.header_count * sizeof(int32_t));
	for (index = 0; index < global_51degrees.header_count; index++) {
		global_51degrees.header_offsets[index] = fiftyoneDegreesGetHttpHeaderNameOffset(ds, index);
		global_51degrees.header_names[index].area = (char*)fiftyoneDegreesGetHttpHeaderNamePointer(ds, index);
		global_51degrees.header_names[index].data = strlen(global_51degrees.header_names[index].area);
		global_51degrees.header_names[index].size = global_51degrees.header_names->data;
	}
}
#endif

/*
 * module init / deinit functions. Returns 0 if OK, or a combination of ERR_*.
 */
static int init_51degrees(void)
{
	int i = 0;
	struct _51d_property_names *name;
	char **_51d_property_list = NULL;
#if defined(FIFTYONEDEGREES_H_PATTERN_INCLUDED) || defined(FIFTYONEDEGREES_H_TRIE_INCLUDED)
	struct buffer *temp;
	fiftyoneDegreesDataSetInitStatus _51d_dataset_status = DATA_SET_INIT_STATUS_NOT_SET;
#elif defined(FIFTYONE_DEGREES_HASH_INCLUDED)
	fiftyoneDegreesConfigHash config = fiftyoneDegreesHashInMemoryConfig;
	fiftyoneDegreesPropertiesRequired properties = fiftyoneDegreesPropertiesDefault;
	fiftyoneDegreesMemoryReader reader;
	fiftyoneDegreesStatusCode status;
	FIFTYONE_DEGREES_EXCEPTION_CREATE;
#endif

	if (!global_51degrees.data_file_path)
		return ERR_NONE;

	if (global.nbthread < 1) {
		ha_alert("51Degrees: The thread count cannot be zero or negative.\n");
		return (ERR_FATAL | ERR_ALERT);
	}

	if (!LIST_ISEMPTY(&global_51degrees.property_names)) {
		i = 0;
		list_for_each_entry(name, &global_51degrees.property_names, list)
			++i;
		_51d_property_list = calloc(i, sizeof(*_51d_property_list));

		i = 0;
		list_for_each_entry(name, &global_51degrees.property_names, list)
			_51d_property_list[i++] = name->name;
	}

#if defined(FIFTYONEDEGREES_H_PATTERN_INCLUDED) || defined(FIFTYONEDEGREES_H_TRIE_INCLUDED)
	_51d_dataset_status = fiftyoneDegreesInitWithPropertyArray(global_51degrees.data_file_path, &global_51degrees.data_set, (const char**)_51d_property_list, i);

	temp = get_trash_chunk();
	chunk_reset(temp);

	switch (_51d_dataset_status) {
		case DATA_SET_INIT_STATUS_SUCCESS:
#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
			global_51degrees.pool = fiftyoneDegreesWorksetPoolCreate(&global_51degrees.data_set, NULL, global.nbthread);
#endif
			_51d_init_http_headers();
			break;
		case DATA_SET_INIT_STATUS_INSUFFICIENT_MEMORY:
			chunk_printf(temp, "Insufficient memory.");
			break;
		case DATA_SET_INIT_STATUS_CORRUPT_DATA:
#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
			chunk_printf(temp, "Corrupt data file. Check that the data file provided is uncompressed and Pattern data format.");
#endif
#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
			chunk_printf(temp, "Corrupt data file. Check that the data file provided is uncompressed and Trie data format.");
#endif
			break;
		case DATA_SET_INIT_STATUS_INCORRECT_VERSION:
#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
			chunk_printf(temp, "Incorrect version. Check that the data file provided is uncompressed and Pattern data format.");
#endif
#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
			chunk_printf(temp, "Incorrect version. Check that the data file provided is uncompressed and Trie data format.");
#endif
			break;
		case DATA_SET_INIT_STATUS_FILE_NOT_FOUND:
			chunk_printf(temp, "File not found.");
			break;
		case DATA_SET_INIT_STATUS_NULL_POINTER:
			chunk_printf(temp, "Null pointer to the existing dataset or memory location.");
			break;
		case DATA_SET_INIT_STATUS_POINTER_OUT_OF_BOUNDS:
			chunk_printf(temp, "Allocated continuous memory containing 51Degrees data file appears to be smaller than expected. Most likely"
			                   " because the data file was not fully loaded into the allocated memory.");
			break;
		case DATA_SET_INIT_STATUS_NOT_SET:
			chunk_printf(temp, "Data set not initialised.");
			break;
		default:
			chunk_printf(temp, "Other error.");
			break;
	}
	if (_51d_dataset_status != DATA_SET_INIT_STATUS_SUCCESS) {
		if (temp->data)
			ha_alert("51Degrees Setup - Error reading 51Degrees data file. %s\n",
				 temp->area);
		else
			ha_alert("51Degrees Setup - Error reading 51Degrees data file.\n");
		return ERR_ALERT | ERR_FATAL;
	}
	free(_51d_property_list);

#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
	_51d_lru_seed = ha_random();
	if (global_51degrees.cache_size) {
		_51d_lru_tree = lru64_new(global_51degrees.cache_size);
	}
#endif

#elif defined(FIFTYONE_DEGREES_HASH_INCLUDED)
	config.b.b.freeData = true;

	if (global_51degrees.use_perf_graph != -1)
		config.usePerformanceGraph = global_51degrees.use_perf_graph;
	if (global_51degrees.use_pred_graph != -1)
		config.usePredictiveGraph = global_51degrees.use_pred_graph;

	if (global_51degrees.drift > 0)
		config.drift = global_51degrees.drift;
	if (global_51degrees.difference > 0)
		config.difference = global_51degrees.difference;

	if (global_51degrees.allow_unmatched != -1)
		config.b.allowUnmatched = global_51degrees.allow_unmatched;

	config.strings.concurrency =
	    config.properties.concurrency =
	    config.values.concurrency =
	    config.profiles.concurrency =
	    config.nodes.concurrency =
	    config.profileOffsets.concurrency =
	    config.maps.concurrency =
	    config.components.concurrency =
	    config.rootNodes.concurrency = global.nbthread;

	properties.array = (const char **)_51d_property_list;
	properties.count = i;

	status = fiftyoneDegreesFileReadToByteArray(global_51degrees.data_file_path, &reader);
	if (status == FIFTYONE_DEGREES_STATUS_SUCCESS && !FIFTYONE_DEGREES_EXCEPTION_FAILED) {
		FIFTYONE_DEGREES_EXCEPTION_CLEAR;

		status = fiftyoneDegreesHashInitManagerFromMemory(
			&global_51degrees.manager,
			&config,
			&properties,
			reader.startByte,
			reader.length,
			exception);
	}

	free(_51d_property_list);
	_51d_property_list = NULL;
	i = 0;

	if (status != FIFTYONE_DEGREES_STATUS_SUCCESS || FIFTYONE_DEGREES_EXCEPTION_FAILED) {
		const char *message = fiftyoneDegreesStatusGetMessage(status, global_51degrees.data_file_path);
		if (message)
			ha_alert("51Degrees Setup - Error reading 51Degrees data file. %s\n",
			         message);
		else
			ha_alert("51Degrees Setup - Error reading 51Degrees data file.\n");
		return ERR_ALERT | ERR_FATAL;
	}
#endif

	return ERR_NONE;
}

static void deinit_51degrees(void)
{
	struct _51d_property_names *_51d_prop_name, *_51d_prop_nameb;

#if defined(FIFTYONEDEGREES_H_PATTERN_INCLUDED) || defined(FIFTYONEDEGREES_H_TRIE_INCLUDED)
	free(global_51degrees.header_names);
#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
	if (global_51degrees.pool)
		fiftyoneDegreesWorksetPoolFree(global_51degrees.pool);
#endif
#ifdef FIFTYONEDEGREES_H_TRIE_INCLUDED
#ifdef FIFTYONEDEGREES_NO_THREADING
	free(global_51degrees.device_offsets.firstOffset);
#endif
	free(global_51degrees.header_offsets);
#endif
	fiftyoneDegreesDataSetFree(&global_51degrees.data_set);
#endif

	ha_free(&global_51degrees.data_file_path);
	list_for_each_entry_safe(_51d_prop_name, _51d_prop_nameb, &global_51degrees.property_names, list) {
		LIST_DELETE(&_51d_prop_name->list);
		free(_51d_prop_name);
	}

#ifdef FIFTYONEDEGREES_H_PATTERN_INCLUDED
	while (lru64_destroy(_51d_lru_tree));
#endif
}

#ifdef FIFTYONE_DEGREES_HASH_INCLUDED
static int init_51degrees_per_thread()
{
	if (!global_51degrees.data_file_path) {
		/* noop */
		return 1;
	}

	_51d_headers.max = global.tune.max_http_hdr;
	_51d_headers.buf = calloc(_51d_headers.max, sizeof(*_51d_headers.buf));
	_51d_headers.count = 0;

	if (!_51d_headers.buf)
		return 0;

	if (!_51d_init_internal())
		return 0;

	return 1;
}

static void deinit_51degrees_per_thread()
{
	int i;

	if (_51d_results) {
		fiftyoneDegreesResultsHashFree(_51d_results);
		_51d_results = NULL;
	}

	if (_51d_headers.buf) {
		for (i = 0; i < _51d_headers.max; i++)
			free(_51d_headers.buf[i]);
		free(_51d_headers.buf);
		_51d_headers.buf = NULL;
	}

	_51d_headers.max = 0;
	_51d_headers.count = 0;
}
#endif

static struct cfg_kw_list _51dcfg_kws = {{ }, {
	{ CFG_GLOBAL, "51degrees-data-file", _51d_data_file },
	{ CFG_GLOBAL, "51degrees-property-name-list", _51d_property_name_list },
	{ CFG_GLOBAL, "51degrees-property-separator", _51d_property_separator },
	{ CFG_GLOBAL, "51degrees-cache-size", _51d_cache_size },
#ifdef FIFTYONE_DEGREES_HASH_INCLUDED
	{ CFG_GLOBAL, "51degrees-use-performance-graph", _51d_use_perf_graph },
	{ CFG_GLOBAL, "51degrees-use-predictive-graph", _51d_use_pred_graph },
	{ CFG_GLOBAL, "51degrees-drift", _51d_drift },
	{ CFG_GLOBAL, "51degrees-difference", _51d_difference },
	{ CFG_GLOBAL, "51degrees-allow-unmatched", _51d_allow_unmatched },
#endif
	{ 0, NULL, NULL },
}};

INITCALL1(STG_REGISTER, cfg_register_keywords, &_51dcfg_kws);

/* Note: must not be declared <const> as its list will be overwritten */
static struct sample_fetch_kw_list sample_fetch_keywords = {ILH, {
	{ "51d.all", _51d_fetch, ARG5(1,STR,STR,STR,STR,STR), _51d_fetch_check, SMP_T_STR, SMP_USE_HRQHV },
	{ NULL, NULL, 0, 0, 0 },
}};

INITCALL1(STG_REGISTER, sample_register_fetches, &sample_fetch_keywords);

/* Note: must not be declared <const> as its list will be overwritten */
static struct sample_conv_kw_list conv_kws = {ILH, {
	{ "51d.single", _51d_conv, ARG5(1,STR,STR,STR,STR,STR), _51d_conv_check, SMP_T_STR, SMP_T_STR },
	{ NULL, NULL, 0, 0, 0 },
}};

INITCALL1(STG_REGISTER, sample_register_convs, &conv_kws);

REGISTER_POST_CHECK(init_51degrees);
REGISTER_POST_DEINIT(deinit_51degrees);

#if defined(FIFTYONEDEGREES_H_PATTERN_INCLUDED)
#ifndef FIFTYONEDEGREES_DUMMY_LIB
	REGISTER_BUILD_OPTS("Built with 51Degrees Pattern support.");
#else
	REGISTER_BUILD_OPTS("Built with 51Degrees Pattern support (dummy library).");
#endif
#elif defined(FIFTYONEDEGREES_H_TRIE_INCLUDED)
#ifndef FIFTYONEDEGREES_DUMMY_LIB
	REGISTER_BUILD_OPTS("Built with 51Degrees Trie support.");
#else
	REGISTER_BUILD_OPTS("Built with 51Degrees Trie support (dummy library).");
#endif
#elif defined(FIFTYONE_DEGREES_HASH_INCLUDED)
	REGISTER_PER_THREAD_INIT(init_51degrees_per_thread);
	REGISTER_PER_THREAD_DEINIT(deinit_51degrees_per_thread);
#ifndef FIFTYONEDEGREES_DUMMY_LIB
	REGISTER_BUILD_OPTS("Built with 51Degrees V4 Hash support.");
#else
	REGISTER_BUILD_OPTS("Built with 51Degrees V4 Hash support (dummy library).");
#endif
#endif