/*
  Copyright 2011-2017 David Robillard <http://drobilla.net>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#undef NDEBUG

#include <assert.h>
#include <float.h>
#include <math.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "serd/serd.h"

#ifndef INFINITY
#    define INFINITY (DBL_MAX + DBL_MAX)
#endif
#ifndef NAN
#    define NAN (INFINITY - INFINITY)
#endif

#define NS_XSD "http://www.w3.org/2001/XMLSchema#"

static void
test_strtod(double dbl, double max_delta)
{
	char buf[1024];
	snprintf(buf, sizeof(buf), "%f", dbl);

	size_t       end = 0;
	const double out = serd_strtod(buf, &end);

	const double diff = fabs(out - dbl);
	assert(diff <= max_delta);
	assert(end == strlen(buf));
}

static SerdStatus
count_prefixes(void* handle, const SerdNode* name, const SerdNode* uri)
{
	(void)name;
	(void)uri;

	++*(int*)handle;
	return SERD_SUCCESS;
}

static SerdStatus
count_statements(void*                handle,
                 SerdStatementFlags   flags,
                 const SerdStatement* statement)
{
	(void)flags;
	(void)statement;

	++*(size_t*)handle;
	return SERD_SUCCESS;
}

/// Returns EOF after a statement, then succeeds again (like a socket)
static size_t
eof_test_read(void* buf, size_t size, size_t nmemb, void* stream)
{
	assert(nmemb == 1);

	static const char* const string = "_:s1 <http://example.org/p> _:o1 .\n"
	                                  "_:s2 <http://example.org/p> _:o2 .\n";

	size_t* count = (size_t*)stream;
	if (*count == 34 || *count == 35 || *count + nmemb >= strlen(string)) {
		++*count;
		return 0;
	}

	memcpy((char*)buf, string + *count, size * nmemb);
	*count += nmemb;
	return nmemb;
}

static int
eof_test_error(void* stream)
{
	(void)stream;
	return 0;
}

static void
test_file_uri(const char* hostname,
              const char* path,
              const char* expected_uri,
              const char* expected_path)
{
	if (!expected_path) {
		expected_path = path;
	}

	SerdNode*   node         = serd_new_file_uri(path, hostname);
	const char* node_str     = serd_node_get_string(node);
	char*       out_hostname = NULL;
	char*       out_path     = serd_file_uri_parse(node_str, &out_hostname);
	assert(!strcmp(node_str, expected_uri));
	assert((hostname && out_hostname) || (!hostname && !out_hostname));
	assert(!strcmp(out_path, expected_path));

	serd_free(out_path);
	serd_free(out_hostname);
	serd_node_free(node);
}

static void
test_read_chunks(void)
{
	SerdWorld*        world        = serd_world_new();
	size_t            n_statements = 0;
	FILE* const       f            = tmpfile();
	static const char null         = 0;
	SerdSink*         sink         = serd_sink_new(&n_statements, NULL);

	assert(sink);
	serd_sink_set_statement_func(sink, count_statements);

	SerdReader* reader = serd_reader_new(world, SERD_TURTLE, sink, 4096);
	assert(reader);
	assert(f);

	SerdStatus st = serd_reader_start_stream(reader,
	                                         (SerdReadFunc)fread,
	                                         (SerdStreamErrorFunc)ferror,
	                                         f,
	                                         NULL,
	                                         1);
	assert(st == SERD_SUCCESS);

	// Write two statement separated by null characters
	fprintf(f, "@prefix eg: <http://example.org/> .\n");
	fprintf(f, "eg:s eg:p eg:o1 .\n");
	fwrite(&null, sizeof(null), 1, f);
	fprintf(f, "eg:s eg:p eg:o2 .\n");
	fwrite(&null, sizeof(null), 1, f);
	fseek(f, 0, SEEK_SET);

	// Read prefix
	st = serd_reader_read_chunk(reader);
	assert(st == SERD_SUCCESS);
	assert(n_statements == 0);

	// Read first statement
	st = serd_reader_read_chunk(reader);
	assert(st == SERD_SUCCESS);
	assert(n_statements == 1);

	// Read terminator
	st = serd_reader_read_chunk(reader);
	assert(st == SERD_FAILURE);
	assert(n_statements == 1);

	// Read second statement (after null terminator)
	st = serd_reader_read_chunk(reader);
	assert(st == SERD_SUCCESS);
	assert(n_statements == 2);

	// Read terminator
	st = serd_reader_read_chunk(reader);
	assert(st == SERD_FAILURE);
	assert(n_statements == 2);

	// EOF
	st = serd_reader_read_chunk(reader);
	assert(st == SERD_FAILURE);
	assert(n_statements == 2);

	serd_reader_free(reader);
	serd_sink_free(sink);
	fclose(f);
	serd_world_free(world);
}

static int
test_get_blank(void)
{
	SerdWorld* world = serd_world_new();
	char       expected[8];

	for (unsigned i = 0; i < 32; ++i) {
		const SerdNode* blank = serd_world_get_blank(world);

		snprintf(expected, sizeof(expected), "b%u", i + 1);
		assert(!strcmp(serd_node_get_string(blank), expected));
	}

	serd_world_free(world);
	return 0;
}

static void
test_string_to_double(void)
{
#define MAX       1000000
#define NUM_TESTS 1000
	for (int i = 0; i < NUM_TESTS; ++i) {
		double dbl = rand() % MAX;
		dbl += (rand() % MAX) / (double)MAX;

		test_strtod(dbl, 1 / (double)MAX);
	}

	size_t end = 0;
	assert(isnan(serd_strtod("NaN", &end)));
	assert(end == 3);

	assert(serd_strtod("INF", &end) == INFINITY);
	assert(end == 3);

	assert(serd_strtod("-INF", &end) == -INFINITY);
	assert(end == 4);

	const double expt_test_nums[] = {
		2.0E18, -5e19, +8e20, 2e+24, -5e-5, 8e0, 9e-0, 2e+0
	};

	const char* expt_test_strs[] = {
		"02e18", "-5e019", "+8e20", "2E+24", "-5E-5", "8E0", "9e-0", " 2e+0"
	};

	for (unsigned i = 0; i < sizeof(expt_test_nums) / sizeof(double); ++i) {
		const double num   = serd_strtod(expt_test_strs[i], NULL);
		const double delta = fabs(num - expt_test_nums[i]);
		assert(delta <= DBL_EPSILON);
	}
}

static void
test_double_to_node(void)
{
	const double dbl_test_nums[] = { 0.0,
	                                 9.0,
	                                 10.0,
	                                 .01,
	                                 2.05,
	                                 -16.00001,
	                                 5.000000005,
	                                 0.0000000001,
	                                 (double)NAN,
	                                 (double)INFINITY };

	const char* dbl_test_strs[] = { "0.0",
	                                "9.0",
	                                "10.0",
	                                "0.01",
	                                "2.05",
	                                "-16.00001",
	                                "5.00000001",
	                                "0.0",
	                                NULL,
	                                NULL };

	for (unsigned i = 0; i < sizeof(dbl_test_nums) / sizeof(double); ++i) {
		SerdNode*   node     = serd_new_decimal(dbl_test_nums[i], 8, NULL);
		const char* node_str = serd_node_get_string(node);
		const bool  pass     = (node_str && dbl_test_strs[i])
		                          ? !strcmp(node_str, dbl_test_strs[i])
		                          : (node_str == dbl_test_strs[i]);
		assert(pass);
		const size_t len = node_str ? strlen(node_str) : 0;
		assert(serd_node_get_length(node) == len);
		assert(!dbl_test_strs[i] ||
		       !strcmp(serd_node_get_string(serd_node_get_datatype(node)),
		               NS_XSD "decimal"));
		serd_node_free(node);
	}
}

static void
test_integer_to_node(void)
{
	const long int_test_nums[] = {
		0, -0, -23, 23, -12340, 1000, -1000
	};

	const char* int_test_strs[] = {
		"0", "0", "-23", "23", "-12340", "1000", "-1000"
	};

	for (unsigned i = 0; i < sizeof(int_test_nums) / sizeof(double); ++i) {
		SerdNode*   node     = serd_new_integer(int_test_nums[i], NULL);
		const char* node_str = serd_node_get_string(node);
		assert(!strcmp(node_str, int_test_strs[i]));
		const size_t len = strlen(node_str);
		assert(serd_node_get_length(node) == len);
		assert(!strcmp(serd_node_get_string(serd_node_get_datatype(node)),
		               NS_XSD "integer"));
		serd_node_free(node);
	}
}

static void
test_boolean(void)
{
	SerdNode* true_node = serd_new_boolean(true);
	assert(!strcmp(serd_node_get_string(true_node), "true"));
	assert(!strcmp(serd_node_get_string(serd_node_get_datatype(true_node)),
	               NS_XSD "boolean"));
	serd_node_free(true_node);

	SerdNode* false_node = serd_new_boolean(false);
	assert(!strcmp(serd_node_get_string(false_node), "false"));
	assert(!strcmp(serd_node_get_string(serd_node_get_datatype(false_node)),
	               NS_XSD "boolean"));
	serd_node_free(false_node);
}

static void
test_blob_to_node(void)
{
	assert(!serd_new_blob(NULL, 0, true, NULL));
	assert(!serd_new_blob("data", 0, true, NULL));

	for (size_t size = 1; size < 256; ++size) {
		uint8_t* data = (uint8_t*)malloc(size);
		for (size_t i = 0; i < size; ++i) {
			data[i] = (uint8_t)(rand() % 256);
		}

		size_t       out_size = 0;
		SerdNode*    blob     = serd_new_blob(data, size, size % 5, NULL);
		const char*  blob_str = serd_node_get_string(blob);
		const size_t len      = serd_node_get_length(blob);

		uint8_t* out = (uint8_t*)malloc(serd_base64_decoded_size(len));
		assert(!serd_base64_decode(out, &out_size, blob_str, len));
		assert(serd_node_get_length(blob) == strlen(blob_str));
		assert(out_size == size);

		for (size_t i = 0; i < size; ++i) {
			assert(out[i] == data[i]);
		}

		assert(!strcmp(serd_node_get_string(serd_node_get_datatype(blob)),
		               NS_XSD "base64Binary"));

		serd_node_free(blob);
		free(out);
		free(data);
	}
}

static void
test_strlen(void)
{
	const uint8_t str[] = { '"', '5', 0xE2, 0x82, 0xAC, '"', '\n', 0 };

	SerdNodeFlags flags;
	size_t        n_bytes = serd_strlen((const char*)str, &flags);
	assert(n_bytes == 7 && flags == (SERD_HAS_QUOTE|SERD_HAS_NEWLINE));
	assert(serd_strlen((const char*)str, NULL) == 7);
}

static void
test_strerror(void)
{
	const char* msg = serd_strerror(SERD_SUCCESS);
	assert(!strcmp(msg, "Success"));
	for (int i = SERD_FAILURE; i <= SERD_ERR_NO_DATA; ++i) {
		msg = serd_strerror((SerdStatus)i);
		assert(strcmp(msg, "Success"));
	}
	msg = serd_strerror((SerdStatus)-1);
	assert(!strcmp(msg, "Unknown error"));
}

static void
test_uri_parsing(void)
{
	test_file_uri(NULL, "C:/My 100%",
	              "file:///C:/My%20100%%", NULL);
	test_file_uri("ahost", "C:\\Pointless Space",
	              "file://ahost/C:/Pointless%20Space", "C:/Pointless Space");
	test_file_uri(NULL, "/foo/bar",
	              "file:///foo/bar", NULL);
	test_file_uri("bhost", "/foo/bar",
	              "file://bhost/foo/bar", NULL);
	test_file_uri(NULL, "a/relative <path>",
	              "a/relative%20%3Cpath%3E", NULL);

	// Test tolerance of parsing junk URI escapes

	char* out_path = serd_file_uri_parse("file:///foo/%0Xbar", NULL);
	assert(!strcmp(out_path, "/foo/bar"));
	serd_free(out_path);
}

static void
test_node_equals(void)
{
	const uint8_t replacement_char_str[] = { 0xEF, 0xBF, 0xBD, 0 };
	SerdNode* lhs = serd_new_string((const char*)replacement_char_str);
	SerdNode* rhs = serd_new_string("123");
	assert(!serd_node_equals(lhs, rhs));

	SerdNode* qnode = serd_new_curie("foo:bar");
	assert(!serd_node_equals(lhs, qnode));
	serd_node_free(qnode);

	assert(!serd_node_copy(NULL));

	serd_node_free(lhs);
	serd_node_free(rhs);
}

static void
test_node_from_string(void)
{
	assert(!serd_new_string(NULL));

	SerdNode* hello = serd_new_string("hello\"");
	assert(serd_node_get_length(hello) == 6);
	assert(serd_node_get_flags(hello) == SERD_HAS_QUOTE);
	assert(!strncmp(serd_node_get_string(hello), "hello\"", 6));
	serd_node_free(hello);
}

static void
test_node_from_substring(void)
{
	assert(!serd_new_substring(NULL, 32));

	SerdNode* a_b = serd_new_substring("a\"bc", 3);
	assert(serd_node_get_length(a_b) == 3);
	assert(serd_node_get_flags(a_b) == SERD_HAS_QUOTE);
	assert(strlen(serd_node_get_string(a_b)) == 3);
	assert(!strncmp(serd_node_get_string(a_b), "a\"b", 3));

	serd_node_free(a_b);
	a_b = serd_new_substring("a\"bc", 10);
	assert(serd_node_get_length(a_b) == 4);
	assert(serd_node_get_flags(a_b) == SERD_HAS_QUOTE);
	assert(strlen(serd_node_get_string(a_b)) == 4);
	assert(!strncmp(serd_node_get_string(a_b), "a\"bc", 4));
	serd_node_free(a_b);
}

static void
test_simple_node(void)
{
	assert(!serd_new_simple_node(SERD_LITERAL, "Literal", 7));
	assert(!serd_new_simple_node(SERD_URI, NULL, 0));
}

static void
test_literal(void)
{
	assert(!serd_new_literal(NULL, 0, NULL, 0, NULL, 0));
	assert(!serd_new_plain_literal(NULL, NULL));
	assert(!serd_new_typed_literal(NULL, NULL));

	SerdNode* hello2 = serd_new_string("hello\"");
	assert(!serd_new_typed_literal("bad type", hello2));

	assert(serd_node_get_length(hello2) == 6 &&
	       serd_node_get_flags(hello2) == SERD_HAS_QUOTE &&
	       !strcmp(serd_node_get_string(hello2), "hello\""));

	SerdNode* hello3 = serd_new_plain_literal("hello\"", NULL);
	assert(serd_node_equals(hello2, hello3));

	SerdNode* hello4 = serd_new_typed_literal("hello\"", NULL);
	assert(serd_node_equals(hello4, hello2));

	serd_node_free(hello4);
	serd_node_free(hello3);
	serd_node_free(hello2);

	const char* lang_lit_str = "\"Hello\"@en";
	SerdNode*   sliced_lang_lit =
	        serd_new_literal(lang_lit_str + 1, 5, NULL, 0, lang_lit_str + 8, 2);
	assert(!strcmp(serd_node_get_string(sliced_lang_lit), "Hello"));
	assert(!strcmp(
	        serd_node_get_string(serd_node_get_language(sliced_lang_lit)),
	        "en"));
	serd_node_free(sliced_lang_lit);

	const char* type_lit_str = "\"Hallo\"^^<http://example.org/Greeting>";
	SerdNode*   sliced_type_lit =
		serd_new_literal(type_lit_str + 1, 5, type_lit_str + 10, 27, NULL, 0);
	assert(!strcmp(serd_node_get_string(sliced_type_lit), "Hallo"));
	assert(!strcmp(
	        serd_node_get_string(serd_node_get_datatype(sliced_type_lit)),
	        "http://example.org/Greeting"));
	serd_node_free(sliced_type_lit);

	SerdNode* plain_lit = serd_new_literal("Plain", 5, NULL, 0, NULL, 0);
	assert(!strcmp(serd_node_get_string(plain_lit), "Plain"));
	serd_node_free(plain_lit);
}

static void
test_uri_from_string(void)
{
	assert(!serd_new_uri(NULL));

	SerdNode* base      = serd_new_uri("http://example.org/a/b/c/");
	SerdNode* not_a_uri = serd_new_string("hello");
	SerdNode* nil       = serd_new_resolved_uri(NULL, base);
	SerdNode* nil2      = serd_new_resolved_uri("", base);
	assert(!serd_new_resolved_uri("", NULL));
	assert(!serd_new_resolved_uri("", not_a_uri));
	assert(serd_node_get_type(nil) == SERD_URI);
	assert(!strcmp(serd_node_get_string(nil), serd_node_get_string(base)));
	assert(serd_node_get_type(nil2) == SERD_URI);
	assert(!strcmp(serd_node_get_string(nil2), serd_node_get_string(base)));
	serd_node_free(nil2);
	serd_node_free(nil);
	serd_node_free(not_a_uri);
	serd_node_free(base);
}

static void
check_rel_uri(const char*     uri,
              const SerdNode* base,
              const SerdNode* root,
              const char*     expected)
{
	SerdNode* rel = serd_new_relative_uri(uri, base, root);
	const int ret = strcmp(serd_node_get_string(rel), expected);
	serd_node_free(rel);
	assert(!ret);
}

static void
test_relative_uri(void)
{
	SerdNode* root = serd_new_uri("http://example.org/a/b/ignored");
	SerdNode* base = serd_new_uri("http://example.org/a/b/c/");

	check_rel_uri("http://example.org/a/b/c/foo", base, NULL, "foo");
	check_rel_uri("http://example.org/a/", base, NULL, "../../");
	check_rel_uri("http://example.org/a/", base, root, "http://example.org/a/");
	check_rel_uri("http://example.org/a/b/x", root, root, "x");
	check_rel_uri("http://example.org/", base, NULL, "../../../");
	check_rel_uri("http://drobilla.net/a", base, NULL, "http://drobilla.net/a");

	serd_node_free(base);
	serd_node_free(root);
}

static void
test_uri_resolution(void)
{
	SerdNode* base      = serd_new_uri("http://example.org/a/b/c/");
	SerdNode* nil       = serd_new_resolved_uri(NULL, base);
	SerdNode* nil2      = serd_new_resolved_uri("", base);
	SerdNode* not_a_uri = serd_new_string("hello");
	SerdNode* root      = serd_new_uri("http://example.org/a/b/");

	assert(!serd_node_resolve(NULL, base));
	assert(!serd_node_resolve(nil, NULL));
	assert(!serd_node_resolve(not_a_uri, base));
	assert(!serd_node_resolve(nil, not_a_uri));

	SerdNode* rel = serd_new_relative_uri(
		"http://example.org/a/b/c/foo", base, NULL);
	SerdNode* resolved = serd_node_resolve(rel, base);
	assert(!strcmp(serd_node_get_string(resolved),
	               "http://example.org/a/b/c/foo"));

	serd_node_free(nil);
	serd_node_free(nil2);
	serd_node_free(not_a_uri);
	serd_node_free(resolved);
	serd_node_free(rel);
	serd_node_free(base);
	serd_node_free(root);
}

static void
test_blank(void)
{
	assert(!serd_new_blank(NULL));

	SerdNode* blank = serd_new_blank("b0");
	assert(serd_node_get_length(blank) == 2);
	assert(serd_node_get_flags(blank) == 0);
	assert(!strcmp(serd_node_get_string(blank), "b0"));
	serd_node_free(blank);
}

static void
test_env(void)
{
	SerdWorld* world = serd_world_new();

	SerdNode* hello = serd_new_string("hello\"");
	SerdNode* eg    = serd_new_uri("http://example.org/");
	SerdNode* foo_u = serd_new_uri("http://example.org/foo");
	SerdNode* empty = serd_new_uri("");
	SerdNode* foo_c = serd_new_curie("eg.2:foo");
	SerdNode* b     = serd_new_curie("invalid");
	SerdNode* pre   = serd_new_curie("eg.2");
	SerdEnv*  env   = serd_env_new(NULL);
	serd_env_set_prefix(env, pre, eg);

	assert(!serd_env_get_base_uri(env));
	assert(serd_env_set_base_uri(env, NULL));
	assert(serd_env_set_base_uri(env, empty));
	assert(serd_env_set_base_uri(env, hello));
	assert(!serd_env_get_base_uri(env));

	SerdNode* xnode = serd_env_expand(env, hello);
	assert(!xnode);

	assert(!serd_env_expand(env, b));
	assert(!serd_env_expand(env, hello));

	assert(serd_env_set_base_uri(NULL, eg));
	assert(serd_env_set_base_uri(env, NULL));

	serd_node_free(hello);

	SerdNode* xu = serd_env_expand(env, foo_c);
	assert(!strcmp(serd_node_get_string(xu), "http://example.org/foo"));
	serd_node_free(xu);

	SerdNode* badpre = serd_new_curie("hm:what");
	SerdNode* xbadpre = serd_env_expand(env, badpre);
	assert(!xbadpre);
	serd_node_free(badpre);

	SerdNode* xc = serd_env_expand(env, foo_c);
	assert(serd_node_equals(xc, foo_u));
	serd_node_free(xc);

	assert(serd_env_set_prefix(env, NULL, NULL));

	SerdNode* lit = serd_new_string("hello");
	assert(serd_env_set_prefix(env, b, lit));

	size_t    n_prefixes          = 0;
	SerdSink* count_prefixes_sink = serd_sink_new(&n_prefixes, NULL);
	serd_sink_set_prefix_func(count_prefixes_sink, count_prefixes);
	serd_env_set_prefix(env, pre, eg);
	serd_env_write_prefixes(env, count_prefixes_sink);
	serd_sink_free(count_prefixes_sink);
	assert(n_prefixes == 1);

	SerdNode* shorter_uri = serd_new_uri("urn:foo");
	assert(!serd_env_qualify(env, shorter_uri));
	serd_node_free(shorter_uri);

	SerdNode* qualified = serd_env_qualify(env, foo_u);
	assert(serd_node_equals(qualified, foo_c));

	SerdEnv* env_copy = serd_env_copy(env);
	assert(serd_env_equals(env, env_copy));
	assert(!serd_env_equals(env, NULL));
	assert(!serd_env_equals(NULL, env));
	assert(serd_env_equals(NULL, NULL));

	SerdNode* qualified2 = serd_env_expand(env_copy, foo_u);
	assert(serd_node_equals(qualified, foo_c));
	serd_node_free(qualified2);

	serd_env_set_prefix_from_strings(
	        env_copy, "test", "http://example.org/test");
	assert(!serd_env_equals(env, env_copy));

	serd_env_set_prefix_from_strings(env, "test2", "http://example.org/test");
	assert(!serd_env_equals(env, env_copy));

	serd_node_free(qualified);
	serd_node_free(foo_c);
	serd_node_free(empty);
	serd_node_free(foo_u);
	serd_node_free(lit);
	serd_node_free(b);
	serd_node_free(pre);
	serd_node_free(eg);
	serd_env_free(env_copy);

	serd_env_free(env);
	serd_world_free(world);
}

static void
test_writer(const char* const path)
{
	FILE* fd = fopen(path, "wb");
	SerdEnv* env = serd_env_new(NULL);
	assert(fd);

	SerdWorld* world = serd_world_new();

	SerdWriter* writer = serd_writer_new(world,
	                                     SERD_TURTLE,
	                                     0,
	                                     env,
	                                     (SerdWriteFunc)fwrite,
	                                     fd);
	assert(writer);

	serd_writer_chop_blank_prefix(writer, "tmp");
	serd_writer_chop_blank_prefix(writer, NULL);

	SerdNode* lit = serd_new_string("hello");

	const SerdSink* iface = serd_writer_get_sink(writer);
	assert(serd_sink_write_base(iface, lit));
	assert(serd_sink_write_prefix(iface, lit, lit));
	assert(serd_sink_write_end(iface, NULL));
	assert(serd_sink_get_env(iface) == env);

	uint8_t buf[] = { 0xEF, 0xBF, 0xBD, 0 };
	SerdNode* s = serd_new_uri("");
	SerdNode* p = serd_new_uri("http://example.org/pred");
	SerdNode* o = serd_new_string((char*)buf);

	// Write 3 invalid statements (should write nothing)
	const SerdNode* junk[][5] = { { s,    p,    NULL },
	                              { s,    NULL, o    },
	                              { NULL, p,    o    },
	                              { s,    p,    NULL },
	                              { s,    NULL, o    },
	                              { NULL, p,    o    },
	                              { s,    o,    o    },
	                              { o,    p,    o    },
	                              { s,    p,    NULL },
	                              { NULL, NULL, NULL } };
	for (unsigned i = 0; i < sizeof(junk) / (sizeof(SerdNode*) * 5); ++i) {
		assert(serd_sink_write(
		        iface, 0, junk[i][0], junk[i][1], junk[i][2], 0));
	}

	SerdNode* urn_Type = serd_new_uri("urn:Type");

	SerdNode* t = serd_new_typed_literal((char*)buf, urn_Type);
	SerdNode* l = serd_new_plain_literal((char*)buf, "en");
	const SerdNode* good[][5] = { { s, p, o },
	                              { s, p, o },
	                              { s, p, t },
	                              { s, p, l },
	                              { s, p, l },
	                              { s, p, t },
	                              { s, p, l },
	                              { s, p, o },
	                              { s, p, o },
	                              { s, p, o } };
	for (unsigned i = 0; i < sizeof(good) / (sizeof(SerdNode*) * 5); ++i) {
		assert(!serd_sink_write(
		        iface, 0, good[i][0], good[i][1], good[i][2], 0));
	}

	// Write statements with bad UTF-8 (should be replaced)
	const uint8_t bad_str[] = { 0xFF, 0x90, 'h', 'i', 0 };
	SerdNode* bad_lit       = serd_new_string((const char*)bad_str);
	SerdNode* bad_uri       = serd_new_uri((const char*)bad_str);
	assert(!serd_sink_write(iface, 0, s, p, bad_lit, 0));
	assert(!serd_sink_write(iface, 0, s, p, bad_uri, 0));
	serd_node_free(bad_uri);
	serd_node_free(bad_lit);

	// Write 1 valid statement
	serd_node_free(o);
	o = serd_new_string("hello");
	assert(!serd_sink_write(iface, 0, s, p, o, 0));

	serd_writer_free(writer);
	serd_node_free(lit);
	serd_node_free(s);
	serd_node_free(p);
	serd_node_free(o);
	serd_node_free(t);
	serd_node_free(l);
	serd_node_free(urn_Type);

	// Test buffer sink
	SerdBuffer    buffer = { NULL, 0 };
	SerdByteSink* byte_sink =
		serd_byte_sink_new((SerdWriteFunc)serd_buffer_sink, &buffer, 1);

	writer = serd_writer_new(world,
	                         SERD_TURTLE,
	                         0,
	                         env,
	                         (SerdWriteFunc)serd_byte_sink_write,
	                         byte_sink);

	o = serd_new_uri("http://example.org/base");
	assert(!serd_writer_set_base_uri(writer, o));

	serd_node_free(o);
	serd_writer_free(writer);
	serd_byte_sink_free(byte_sink);
	char* out = serd_buffer_sink_finish(&buffer);

	assert(!strcmp(out, "@base <http://example.org/base> .\n"));
	serd_free(out);
	serd_env_free(env);
	serd_world_free(world);
	fclose(fd);
}

static void
test_reader(const char* path)
{
	SerdWorld*  world  = serd_world_new();

	size_t    n_statements = 0;
	SerdSink* sink         = serd_sink_new(&n_statements, NULL);
	serd_sink_set_statement_func(sink, count_statements);

	SerdReader* reader = serd_reader_new(world, SERD_TURTLE, sink, 4096);
	assert(reader);

	serd_reader_add_blank_prefix(reader, "tmp");
	serd_reader_add_blank_prefix(reader, NULL);

	assert(serd_reader_start_file(reader, "http://notafile", false));
	assert(serd_reader_start_file(reader, "file://invalid", false));
	assert(serd_reader_start_file(reader, "file:///nonexistant", false));

	assert(!serd_reader_start_file(reader, path, true));
	assert(!serd_reader_read_document(reader));
	assert(n_statements == 13);
	serd_reader_finish(reader);

	// A reader a big page hits EOF then fails to read chunks immediately
	{
		FILE* temp = tmpfile();
		assert(temp);
		fprintf(temp, "_:s <http://example.org/p> _:o .\n");
		fflush(temp);
		fseek(temp, 0L, SEEK_SET);

		serd_reader_start_stream(
			reader,
			(SerdReadFunc)fread, (SerdStreamErrorFunc)ferror, temp,
			NULL,
			4096);

		assert(serd_reader_read_chunk(reader) == SERD_SUCCESS);
		assert(serd_reader_read_chunk(reader) == SERD_FAILURE);
		assert(serd_reader_read_chunk(reader) == SERD_FAILURE);

		serd_reader_finish(reader);
		fclose(temp);
	}

	// A byte-wise reader that hits EOF once then continues (like a socket)
	{
		size_t n_reads = 0;
		serd_reader_start_stream(reader,
		                         (SerdReadFunc)eof_test_read,
		                         (SerdStreamErrorFunc)eof_test_error,
		                         &n_reads,
		                         NULL,
		                         1);

		assert(serd_reader_read_chunk(reader) == SERD_SUCCESS);
		assert(serd_reader_read_chunk(reader) == SERD_FAILURE);
		assert(serd_reader_read_chunk(reader) == SERD_SUCCESS);
		assert(serd_reader_read_chunk(reader) == SERD_FAILURE);
	}

	serd_reader_free(reader);
	serd_sink_free(sink);

	serd_world_free(world);
}

int
main(void)
{
	test_string_to_double();
	test_double_to_node();
	test_integer_to_node();
	test_blob_to_node();
	test_boolean();
	test_strlen();
	test_strerror();
	test_uri_parsing();
	test_node_equals();
	test_node_from_string();
	test_node_from_substring();
	test_simple_node();
	test_literal();
	test_uri_from_string();
	test_relative_uri();
	test_uri_resolution();
	test_blank();
	test_env();
	test_read_chunks();
	test_get_blank();

	const char* const path = "serd_test.ttl";
	test_writer(path);
	test_reader(path);

	printf("Success\n");
	return 0;
}