#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define CMARK_NO_SHORT_NAMES
#include "cmark.h"
#include "node.h"

#include "harness.h"

#define UTF8_REPL "\xEF\xBF\xBD"

void
test_cplusplus(test_batch_runner *runner);

static const cmark_node_type node_types[] = {
	CMARK_NODE_DOCUMENT,
	CMARK_NODE_BLOCK_QUOTE,
	CMARK_NODE_LIST,
	CMARK_NODE_LIST_ITEM,
	CMARK_NODE_CODE_BLOCK,
	CMARK_NODE_HTML,
	CMARK_NODE_PARAGRAPH,
	CMARK_NODE_HEADER,
	CMARK_NODE_HRULE,
	CMARK_NODE_REFERENCE_DEF,
	CMARK_NODE_TEXT,
	CMARK_NODE_SOFTBREAK,
	CMARK_NODE_LINEBREAK,
	CMARK_NODE_INLINE_CODE,
	CMARK_NODE_INLINE_HTML,
	CMARK_NODE_EMPH,
	CMARK_NODE_STRONG,
	CMARK_NODE_LINK,
	CMARK_NODE_IMAGE
};
static const int num_node_types = sizeof(node_types) / sizeof(*node_types);

static void
test_md_to_html(test_batch_runner *runner, const char *markdown,
		const char *expected_html, const char *msg);

static void
test_content(test_batch_runner *runner, cmark_node_type type,
	     int allowed_content);

static void
test_char(test_batch_runner *runner, int valid, const char *utf8,
	  const char *msg);

static void
test_incomplete_char(test_batch_runner *runner, const char *utf8,
		     const char *msg);

static void
test_continuation_byte(test_batch_runner *runner, const char *utf8);

static void
constructor(test_batch_runner *runner)
{
	for (int i = 0; i < num_node_types; ++i) {
		cmark_node_type type = node_types[i];
		cmark_node *node = cmark_node_new(type);
		OK(runner, node != NULL, "new type %d", type);
		INT_EQ(runner, cmark_node_get_type(node), type,
		       "get_type %d", type);

		switch (node->type) {
		case CMARK_NODE_HEADER:
			INT_EQ(runner, cmark_node_get_header_level(node), 1,
			       "default header level is 1");
			node->as.header.level = 1;
			break;

		case CMARK_NODE_LIST:
			INT_EQ(runner, cmark_node_get_list_type(node),
			       CMARK_BULLET_LIST,
			       "default is list type is bullet");
			INT_EQ(runner, cmark_node_get_list_start(node), 1,
			       "default is list start is 1");
			INT_EQ(runner, cmark_node_get_list_tight(node), 0,
			       "default is list is loose");
			break;

		default:
			break;
		}

		cmark_node_free(node);
	}
}

static void
accessors(test_batch_runner *runner)
{
	static const char markdown[] =
		"## Header\n"
		"\n"
		"* Item 1\n"
		"* Item 2\n"
		"\n"
		"2. Item 1\n"
		"\n"
		"3. Item 2\n"
		"\n"
		"\n"
		"    code\n"
		"\n"
		"``` lang\n"
		"fenced\n"
		"```\n"
		"\n"
		"<div>html</div>\n"
		"\n"
		"[link](url 'title')\n";

	cmark_node *doc = cmark_parse_document(markdown, sizeof(markdown) - 1);

	// Getters

	cmark_node *header = cmark_node_first_child(doc);
	INT_EQ(runner, cmark_node_get_header_level(header), 2,
	       "get_header_level");

	cmark_node *bullet_list = cmark_node_next(header);
	INT_EQ(runner, cmark_node_get_list_type(bullet_list),
	       CMARK_BULLET_LIST, "get_list_type bullet");
	INT_EQ(runner, cmark_node_get_list_tight(bullet_list), 1,
	       "get_list_tight tight");

	cmark_node *ordered_list = cmark_node_next(bullet_list);
	INT_EQ(runner, cmark_node_get_list_type(ordered_list),
	       CMARK_ORDERED_LIST, "get_list_type ordered");
	INT_EQ(runner, cmark_node_get_list_start(ordered_list), 2,
	       "get_list_start");
	INT_EQ(runner, cmark_node_get_list_tight(ordered_list), 0,
	       "get_list_tight loose");

	cmark_node *code = cmark_node_next(ordered_list);
	STR_EQ(runner, cmark_node_get_string_content(code), "code\n",
	       "get_string_content indented code");

	cmark_node *fenced = cmark_node_next(code);
	STR_EQ(runner, cmark_node_get_string_content(fenced), "fenced\n",
	       "get_string_content fenced code");
	STR_EQ(runner, cmark_node_get_fence_info(fenced), "lang",
	       "get_fence_info");

	cmark_node *html = cmark_node_next(fenced);
	STR_EQ(runner, cmark_node_get_string_content(html),
	       "<div>html</div>\n", "get_string_content html");

	cmark_node *paragraph = cmark_node_next(html);
	INT_EQ(runner, cmark_node_get_start_line(paragraph), 19,
	       "get_start_line");
	INT_EQ(runner, cmark_node_get_start_column(paragraph), 1,
	       "get_start_column");
	INT_EQ(runner, cmark_node_get_end_line(paragraph), 19,
	       "get_end_line");

	cmark_node *link = cmark_node_first_child(paragraph);
	STR_EQ(runner, cmark_node_get_url(link), "url",
	       "get_url");
	STR_EQ(runner, cmark_node_get_title(link), "title",
	       "get_title");

	cmark_node *string = cmark_node_first_child(link);
	STR_EQ(runner, cmark_node_get_string_content(string), "link",
	       "get_string_content string");

	// Setters

	OK(runner, cmark_node_set_header_level(header, 3),
	   "set_header_level");

	OK(runner, cmark_node_set_list_type(bullet_list, CMARK_ORDERED_LIST),
	   "set_list_type ordered");
	OK(runner, cmark_node_set_list_start(bullet_list, 3),
	   "set_list_start");
	OK(runner, cmark_node_set_list_tight(bullet_list, 0),
	   "set_list_tight loose");

	OK(runner, cmark_node_set_list_type(ordered_list, CMARK_BULLET_LIST),
	   "set_list_type bullet");
	OK(runner, cmark_node_set_list_tight(ordered_list, 1),
	   "set_list_tight tight");

	OK(runner, cmark_node_set_string_content(code, "CODE\n"),
	   "set_string_content indented code");

	OK(runner, cmark_node_set_string_content(fenced, "FENCED\n"),
	   "set_string_content fenced code");
	OK(runner, cmark_node_set_fence_info(fenced, "LANG"),
	   "set_fence_info");

	OK(runner, cmark_node_set_string_content(html, "<div>HTML</div>\n"),
	   "set_string_content html");

	OK(runner, cmark_node_set_url(link, "URL"),
	   "set_url");
	OK(runner, cmark_node_set_title(link, "TITLE"),
	   "set_title");

	OK(runner, cmark_node_set_string_content(string, "LINK"),
	   "set_string_content string");

	char *rendered_html = cmark_render_html(doc);
	static const char expected_html[] =
		"<h3>Header</h3>\n"
		"<ol start=\"3\">\n"
		"<li>\n"
		"<p>Item 1</p>\n"
		"</li>\n"
		"<li>\n"
		"<p>Item 2</p>\n"
		"</li>\n"
		"</ol>\n"
		"<ul>\n"
		"<li>Item 1</li>\n"
		"<li>Item 2</li>\n"
		"</ul>\n"
		"<pre><code>CODE\n"
		"</code></pre>\n"
		"<pre><code class=\"language-LANG\">FENCED\n"
		"</code></pre>\n"
		"<div>HTML</div>\n"
		"<p><a href=\"URL\" title=\"TITLE\">LINK</a></p>\n";
	STR_EQ(runner, rendered_html, expected_html, "setters work");
	free(rendered_html);

	// Getter errors

	INT_EQ(runner, cmark_node_get_header_level(bullet_list), 0,
	       "get_header_level error");
	INT_EQ(runner, cmark_node_get_list_type(header), CMARK_NO_LIST,
	       "get_list_type error");
	INT_EQ(runner, cmark_node_get_list_start(code), 0,
	       "get_list_start error");
	INT_EQ(runner, cmark_node_get_list_tight(fenced), 0,
	       "get_list_tight error");
	OK(runner, cmark_node_get_string_content(ordered_list) == NULL,
	   "get_string_content error");
	OK(runner, cmark_node_get_fence_info(paragraph) == NULL,
	   "get_fence_info error");
	OK(runner, cmark_node_get_url(html) == NULL,
	   "get_url error");
	OK(runner, cmark_node_get_title(header) == NULL,
	   "get_title error");

	// Setter errors

	OK(runner, !cmark_node_set_header_level(bullet_list, 3),
	   "set_header_level error");
	OK(runner, !cmark_node_set_list_type(header, CMARK_ORDERED_LIST),
	   "set_list_type error");
	OK(runner, !cmark_node_set_list_start(code, 3),
	   "set_list_start error");
	OK(runner, !cmark_node_set_list_tight(fenced, 0),
	   "set_list_tight error");
	OK(runner, !cmark_node_set_string_content(ordered_list, "content\n"),
	   "set_string_content error");
	OK(runner, !cmark_node_set_fence_info(paragraph, "lang"),
	   "set_fence_info error");
	OK(runner, !cmark_node_set_url(html, "url"),
	   "set_url error");
	OK(runner, !cmark_node_set_title(header, "title"),
	   "set_title error");

	OK(runner, !cmark_node_set_header_level(header, 0),
	   "set_header_level too small");
	OK(runner, !cmark_node_set_header_level(header, 7),
	   "set_header_level too large");
	OK(runner, !cmark_node_set_list_type(bullet_list, CMARK_NO_LIST),
	   "set_list_type invalid");
	OK(runner, !cmark_node_set_list_start(bullet_list, -1),
	   "set_list_start negative");

	cmark_node_free(doc);
}

static void
node_check(test_batch_runner *runner) {
	// Construct an incomplete tree.
	cmark_node *doc = cmark_node_new(CMARK_NODE_DOCUMENT);
	cmark_node *p1  = cmark_node_new(CMARK_NODE_PARAGRAPH);
	cmark_node *p2  = cmark_node_new(CMARK_NODE_PARAGRAPH);
	doc->first_child = p1;
	p1->next = p2;

	INT_EQ(runner, cmark_node_check(doc, NULL), 4, "node_check works");
	INT_EQ(runner, cmark_node_check(doc, NULL), 0,
	       "node_check fixes tree");

	cmark_node_free(doc);
}

static int
S_handler(cmark_node *node, int entering, void *state)
{
	int *textnodes = state;
	if (entering) {
		if (node->type == CMARK_NODE_TEXT) {
			*textnodes += 1;
		}
	}
	return 1;
}

static void
walk(test_batch_runner *runner) {
	// Construct an incomplete tree.
	cmark_node *doc = cmark_parse_document("> a *b*\n\nc", 10);
	int textnodes = 0;
	INT_EQ(runner, cmark_walk(doc, S_handler, &textnodes), 1,
	       "walk succeeds");
	INT_EQ(runner, textnodes, 3, "walk correctly counts text nodes");

	cmark_node_free(doc);
}

static void
create_tree(test_batch_runner *runner)
{
	char *html;
	cmark_node *doc = cmark_node_new(CMARK_NODE_DOCUMENT);

	cmark_node *p = cmark_node_new(CMARK_NODE_PARAGRAPH);
	OK(runner, !cmark_node_insert_before(doc, p),
	   "insert before root fails");
	OK(runner, !cmark_node_insert_after(doc, p),
	   "insert after root fails");
	OK(runner, cmark_node_append_child(doc, p), "append1");
	INT_EQ(runner, cmark_node_check(doc, NULL), 0, "append1 consistent");
	OK(runner, cmark_node_parent(p) == doc, "node_parent");

	cmark_node *emph = cmark_node_new(CMARK_NODE_EMPH);
	OK(runner, cmark_node_prepend_child(p, emph), "prepend1");
	INT_EQ(runner, cmark_node_check(doc, NULL), 0, "prepend1 consistent");

	cmark_node *str1 = cmark_node_new(CMARK_NODE_TEXT);
	cmark_node_set_string_content(str1, "Hello, ");
	OK(runner, cmark_node_prepend_child(p, str1), "prepend2");
	INT_EQ(runner, cmark_node_check(doc, NULL), 0, "prepend2 consistent");

	cmark_node *str3 = cmark_node_new(CMARK_NODE_TEXT);
	cmark_node_set_string_content(str3, "!");
	OK(runner, cmark_node_append_child(p, str3), "append2");
	INT_EQ(runner, cmark_node_check(doc, NULL), 0, "append2 consistent");

	cmark_node *str2 = cmark_node_new(CMARK_NODE_TEXT);
	cmark_node_set_string_content(str2, "world");
	OK(runner, cmark_node_append_child(emph, str2), "append3");
	INT_EQ(runner, cmark_node_check(doc, NULL), 0, "append3 consistent");

	html = cmark_render_html(doc);
	STR_EQ(runner, html, "<p>Hello, <em>world</em>!</p>\n",
	       "render_html");
	free(html);

	OK(runner, cmark_node_insert_before(str1, str3), "ins before1");
	INT_EQ(runner, cmark_node_check(doc, NULL), 0,
	       "ins before1 consistent");
	// 31e
	OK(runner, cmark_node_first_child(p) == str3, "ins before1 works");

	OK(runner, cmark_node_insert_before(str1, emph), "ins before2");
	INT_EQ(runner, cmark_node_check(doc, NULL), 0,
	       "ins before2 consistent");
	// 3e1
	OK(runner, cmark_node_last_child(p) == str1, "ins before2 works");

	OK(runner, cmark_node_insert_after(str1, str3), "ins after1");
	INT_EQ(runner, cmark_node_check(doc, NULL), 0,
	       "ins after1 consistent");
	// e13
	OK(runner, cmark_node_next(str1) == str3, "ins after1 works");

	OK(runner, cmark_node_insert_after(str1, emph), "ins after2");
	INT_EQ(runner, cmark_node_check(doc, NULL), 0,
	       "ins after2 consistent");
	// 1e3
	OK(runner, cmark_node_previous(emph) == str1, "ins after2 works");

	cmark_node_unlink(emph);

	html = cmark_render_html(doc);
	STR_EQ(runner, html, "<p>Hello, !</p>\n",
	       "render_html after shuffling");
	free(html);

	cmark_node_free(doc);

	// TODO: Test that the contents of an unlinked inline are valid
	// after the parent block was destroyed. This doesn't work so far.
	cmark_node_free(emph);
}

void
hierarchy(test_batch_runner *runner)
{
	cmark_node *bquote1 = cmark_node_new(CMARK_NODE_BLOCK_QUOTE);
	cmark_node *bquote2 = cmark_node_new(CMARK_NODE_BLOCK_QUOTE);
	cmark_node *bquote3 = cmark_node_new(CMARK_NODE_BLOCK_QUOTE);

	OK(runner, cmark_node_append_child(bquote1, bquote2),
	   "append bquote2");
	OK(runner, cmark_node_append_child(bquote2, bquote3),
	   "append bquote3");
	OK(runner, !cmark_node_append_child(bquote3, bquote3),
	   "adding a node as child of itself fails");
	OK(runner, !cmark_node_append_child(bquote3, bquote1),
	   "adding a parent as child fails");

	cmark_node_free(bquote1);

	int max_node_type = CMARK_NODE_LAST_BLOCK > CMARK_NODE_LAST_INLINE
			    ? CMARK_NODE_LAST_BLOCK : CMARK_NODE_LAST_INLINE;
	OK(runner, max_node_type < 32, "all node types < 32");

	int list_item_flag = 1 << CMARK_NODE_LIST_ITEM;
	int top_level_blocks =
		(1 << CMARK_NODE_BLOCK_QUOTE) |
		(1 << CMARK_NODE_LIST) |
		(1 << CMARK_NODE_CODE_BLOCK) |
		(1 << CMARK_NODE_HTML) |
		(1 << CMARK_NODE_PARAGRAPH) |
		(1 << CMARK_NODE_HEADER) |
		(1 << CMARK_NODE_HRULE) |
		(1 << CMARK_NODE_REFERENCE_DEF);
	int all_inlines =
		(1 << CMARK_NODE_TEXT) |
		(1 << CMARK_NODE_SOFTBREAK) |
		(1 << CMARK_NODE_LINEBREAK) |
		(1 << CMARK_NODE_INLINE_CODE) |
		(1 << CMARK_NODE_INLINE_HTML) |
		(1 << CMARK_NODE_EMPH) |
		(1 << CMARK_NODE_STRONG) |
		(1 << CMARK_NODE_LINK) |
		(1 << CMARK_NODE_IMAGE);

	test_content(runner, CMARK_NODE_DOCUMENT,      top_level_blocks);
	test_content(runner, CMARK_NODE_BLOCK_QUOTE,   top_level_blocks);
	test_content(runner, CMARK_NODE_LIST,          list_item_flag);
	test_content(runner, CMARK_NODE_LIST_ITEM,     top_level_blocks);
	test_content(runner, CMARK_NODE_CODE_BLOCK ,   0);
	test_content(runner, CMARK_NODE_HTML,          0);
	test_content(runner, CMARK_NODE_PARAGRAPH,     all_inlines);
	test_content(runner, CMARK_NODE_HEADER,        all_inlines);
	test_content(runner, CMARK_NODE_HRULE,         0);
	test_content(runner, CMARK_NODE_REFERENCE_DEF, 0);
	test_content(runner, CMARK_NODE_TEXT,	       0);
	test_content(runner, CMARK_NODE_SOFTBREAK,     0);
	test_content(runner, CMARK_NODE_LINEBREAK,     0);
	test_content(runner, CMARK_NODE_INLINE_CODE,   0);
	test_content(runner, CMARK_NODE_INLINE_HTML,   0);
	test_content(runner, CMARK_NODE_EMPH,          all_inlines);
	test_content(runner, CMARK_NODE_STRONG,        all_inlines);
	test_content(runner, CMARK_NODE_LINK,          all_inlines);
	test_content(runner, CMARK_NODE_IMAGE,         all_inlines);
}

static void
test_content(test_batch_runner *runner, cmark_node_type type,
	     int allowed_content)
{
	cmark_node *node = cmark_node_new(type);

	for (int i = 0; i < num_node_types; ++i) {
		cmark_node_type child_type = node_types[i];
		cmark_node *child = cmark_node_new(child_type);

		int got = cmark_node_append_child(node, child);
		int expected = (allowed_content >> child_type) & 1;

		INT_EQ(runner, got, expected,
		       "add %d as child of %d", child_type, type);

		cmark_node_free(child);
	}

	cmark_node_free(node);
}

static void
parser(test_batch_runner *runner)
{
	test_md_to_html(runner, "No newline", "<p>No newline</p>\n",
			"document without trailing newline");
}

static void
render_html(test_batch_runner *runner)
{
	char *html;

	static const char markdown[] =
		"foo *bar*\n"
		"\n"
		"paragraph 2\n";
	cmark_node *doc = cmark_parse_document(markdown, sizeof(markdown) - 1);

	cmark_node *paragraph = cmark_node_first_child(doc);
	html = cmark_render_html(paragraph);
	STR_EQ(runner, html, "<p>foo <em>bar</em></p>\n",
	       "render single paragraph");
	free(html);

	cmark_node *string = cmark_node_first_child(paragraph);
	html = cmark_render_html(string);
	STR_EQ(runner, html, "foo ", "render single inline");
	free(html);

	cmark_node *emph = cmark_node_next(string);
	html = cmark_render_html(emph);
	STR_EQ(runner, html, "<em>bar</em>", "render inline with children");
	free(html);

	cmark_node_free(doc);
}

static void
utf8(test_batch_runner *runner)
{
	// Ranges
	test_char(runner, 1, "\x01", "valid utf8 01");
	test_char(runner, 1, "\x7F", "valid utf8 7F");
	test_char(runner, 0, "\x80", "invalid utf8 80");
	test_char(runner, 0, "\xBF", "invalid utf8 BF");
	test_char(runner, 0, "\xC0\x80", "invalid utf8 C080");
	test_char(runner, 0, "\xC1\xBF", "invalid utf8 C1BF");
	test_char(runner, 1, "\xC2\x80", "valid utf8 C280");
	test_char(runner, 1, "\xDF\xBF", "valid utf8 DFBF");
	test_char(runner, 0, "\xE0\x80\x80", "invalid utf8 E08080");
	test_char(runner, 0, "\xE0\x9F\xBF", "invalid utf8 E09FBF");
	test_char(runner, 1, "\xE0\xA0\x80", "valid utf8 E0A080");
	test_char(runner, 1, "\xED\x9F\xBF", "valid utf8 ED9FBF");
	test_char(runner, 0, "\xED\xA0\x80", "invalid utf8 EDA080");
	test_char(runner, 0, "\xED\xBF\xBF", "invalid utf8 EDBFBF");
	test_char(runner, 0, "\xF0\x80\x80\x80", "invalid utf8 F0808080");
	test_char(runner, 0, "\xF0\x8F\xBF\xBF", "invalid utf8 F08FBFBF");
	test_char(runner, 1, "\xF0\x90\x80\x80", "valid utf8 F0908080");
	test_char(runner, 1, "\xF4\x8F\xBF\xBF", "valid utf8 F48FBFBF");
	test_char(runner, 0, "\xF4\x90\x80\x80", "invalid utf8 F4908080");
	test_char(runner, 0, "\xF7\xBF\xBF\xBF", "invalid utf8 F7BFBFBF");
	test_char(runner, 0, "\xF8", "invalid utf8 F8");
	test_char(runner, 0, "\xFF", "invalid utf8 FF");

	// Incomplete byte sequences at end of input
	test_incomplete_char(runner, "\xE0\xA0", "invalid utf8 E0A0");
	test_incomplete_char(runner, "\xF0\x90\x80", "invalid utf8 F09080");

	// Invalid continuation bytes
	test_continuation_byte(runner, "\xC2\x80");
	test_continuation_byte(runner, "\xE0\xA0\x80");
	test_continuation_byte(runner, "\xF0\x90\x80\x80");

	// Test string containing null character
	static const char string_with_null[] = "((((\0))))";
	char *html = cmark_markdown_to_html(string_with_null,
					    sizeof(string_with_null) - 1);
	STR_EQ(runner, html, "<p>((((" UTF8_REPL "))))</p>\n",
	       "utf8 with U+0000");
	free(html);
}

static void
test_char(test_batch_runner *runner, int valid, const char *utf8,
	  const char *msg)
{
	char buf[20];
	sprintf(buf, "((((%s))))", utf8);

	if (valid) {
		char expected[30];
		sprintf(expected, "<p>((((%s))))</p>\n", utf8);
		test_md_to_html(runner, buf, expected, msg);
	}
	else {
		test_md_to_html(runner, buf, "<p>((((" UTF8_REPL "))))</p>\n",
				msg);
	}
}

static void
test_incomplete_char(test_batch_runner *runner, const char *utf8,
		     const char *msg)
{
	char buf[20];
	sprintf(buf, "----%s", utf8);
	test_md_to_html(runner, buf, "<p>----" UTF8_REPL "</p>\n", msg);
}

static void
test_continuation_byte(test_batch_runner *runner, const char *utf8)
{
	int len = strlen(utf8);

	for (int pos = 1; pos < len; ++pos) {
		char buf[20];
		sprintf(buf, "((((%s))))", utf8);
		buf[4+pos] = '\x20';

		char expected[50];
		strcpy(expected, "<p>((((" UTF8_REPL "\x20");
		for (int i = pos + 1; i < len; ++i) {
			strcat(expected, UTF8_REPL);
		}
		strcat(expected, "))))</p>\n");

		char *html = cmark_markdown_to_html(buf, strlen(buf));
		STR_EQ(runner, html, expected,
		       "invalid utf8 continuation byte %d/%d", pos, len);
		free(html);
	}
}

static void
test_md_to_html(test_batch_runner *runner, const char *markdown,
		const char *expected_html, const char *msg)
{
	char *html = cmark_markdown_to_html(markdown, strlen(markdown));
	STR_EQ(runner, html, expected_html, msg);
	free(html);
}

int main() {
	int retval;
	test_batch_runner *runner = test_batch_runner_new();

	constructor(runner);
	accessors(runner);
	node_check(runner);
	walk(runner);
	create_tree(runner);
	hierarchy(runner);
	parser(runner);
	render_html(runner);
	utf8(runner);
	test_cplusplus(runner);

	test_print_summary(runner);
	retval =  test_ok(runner) ? 0 : 1;
	free(runner);

	return retval;
}