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

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

#include "harness.h"
#include "cplusplus.h"

#define UTF8_REPL "\xEF\xBF\xBD"

static const cmark_node_type node_types[] = {
    CMARK_NODE_DOCUMENT,  CMARK_NODE_BLOCK_QUOTE, CMARK_NODE_LIST,
    CMARK_NODE_ITEM,      CMARK_NODE_CODE_BLOCK,  CMARK_NODE_HTML_BLOCK,
    CMARK_NODE_PARAGRAPH, CMARK_NODE_HEADING,     CMARK_NODE_THEMATIC_BREAK,
    CMARK_NODE_TEXT,      CMARK_NODE_SOFTBREAK,   CMARK_NODE_LINEBREAK,
    CMARK_NODE_CODE,      CMARK_NODE_HTML_INLINE, 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 version(test_batch_runner *runner) {
  INT_EQ(runner, cmark_version(), CMARK_VERSION, "cmark_version");
  STR_EQ(runner, cmark_version_string(), CMARK_VERSION_STRING,
         "cmark_version_string");
}

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_HEADING:
      INT_EQ(runner, cmark_node_get_heading_level(node), 1,
             "default heading level is 1");
      node->as.heading.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_delim(node), CMARK_NO_DELIM,
             "default is list delim is NO_DELIM");
      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, CMARK_OPT_DEFAULT);

  // Getters

  cmark_node *heading = cmark_node_first_child(doc);
  INT_EQ(runner, cmark_node_get_heading_level(heading), 2, "get_heading_level");

  cmark_node *bullet_list = cmark_node_next(heading);
  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_delim(ordered_list), CMARK_PERIOD_DELIM,
         "get_list_delim 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_literal(code), "code\n",
         "get_literal indented code");

  cmark_node *fenced = cmark_node_next(code);
  STR_EQ(runner, cmark_node_get_literal(fenced), "fenced\n",
         "get_literal 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_literal(html), "<div>html</div>\n",
         "get_literal 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_literal(string), "link", "get_literal string");

  // Setters

  OK(runner, cmark_node_set_heading_level(heading, 3), "set_heading_level");

  OK(runner, cmark_node_set_list_type(bullet_list, CMARK_ORDERED_LIST),
     "set_list_type ordered");
  OK(runner, cmark_node_set_list_delim(bullet_list, CMARK_PAREN_DELIM),
     "set_list_delim paren");
  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_literal(code, "CODE\n"),
     "set_literal indented code");

  OK(runner, cmark_node_set_literal(fenced, "FENCED\n"),
     "set_literal fenced code");
  OK(runner, cmark_node_set_fence_info(fenced, "LANG"), "set_fence_info");

  OK(runner, cmark_node_set_literal(html, "<div>HTML</div>\n"),
     "set_literal 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_literal(string, "LINK"), "set_literal string");

  char *rendered_html = cmark_render_html(doc, CMARK_OPT_DEFAULT);
  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_heading_level(bullet_list), 0,
         "get_heading_level error");
  INT_EQ(runner, cmark_node_get_list_type(heading), 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_literal(ordered_list) == NULL, "get_literal 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(heading) == NULL, "get_title error");

  // Setter errors

  OK(runner, !cmark_node_set_heading_level(bullet_list, 3),
     "set_heading_level error");
  OK(runner, !cmark_node_set_list_type(heading, 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_literal(ordered_list, "content\n"),
     "set_literal 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(heading, "title"), "set_title error");

  OK(runner, !cmark_node_set_heading_level(heading, 0),
     "set_heading_level too small");
  OK(runner, !cmark_node_set_heading_level(heading, 7),
     "set_heading_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 void iterator(test_batch_runner *runner) {
  cmark_node *doc = cmark_parse_document("> a *b*\n\nc", 10, CMARK_OPT_DEFAULT);
  int parnodes = 0;
  cmark_event_type ev_type;
  cmark_iter *iter = cmark_iter_new(doc);
  cmark_node *cur;

  while ((ev_type = cmark_iter_next(iter)) != CMARK_EVENT_DONE) {
    cur = cmark_iter_get_node(iter);
    if (cur->type == CMARK_NODE_PARAGRAPH && ev_type == CMARK_EVENT_ENTER) {
      parnodes += 1;
    }
  }
  INT_EQ(runner, parnodes, 2, "iterate correctly counts paragraphs");

  cmark_iter_free(iter);
  cmark_node_free(doc);
}

static void iterator_delete(test_batch_runner *runner) {
  static const char md[] = "a *b* c\n"
                           "\n"
                           "* item1\n"
                           "* item2\n"
                           "\n"
                           "a `b` c\n"
                           "\n"
                           "* item1\n"
                           "* item2\n";
  cmark_node *doc = cmark_parse_document(md, sizeof(md) - 1, CMARK_OPT_DEFAULT);
  cmark_iter *iter = cmark_iter_new(doc);
  cmark_event_type ev_type;

  while ((ev_type = cmark_iter_next(iter)) != CMARK_EVENT_DONE) {
    cmark_node *node = cmark_iter_get_node(iter);
    // Delete list, emph, and code nodes.
    if ((ev_type == CMARK_EVENT_EXIT && node->type == CMARK_NODE_LIST) ||
        (ev_type == CMARK_EVENT_EXIT && node->type == CMARK_NODE_EMPH) ||
        (ev_type == CMARK_EVENT_ENTER && node->type == CMARK_NODE_CODE)) {
      cmark_node_free(node);
    }
  }

  char *html = cmark_render_html(doc, CMARK_OPT_DEFAULT);
  static const char expected[] = "<p>a  c</p>\n"
                                 "<p>a  c</p>\n";
  STR_EQ(runner, html, expected, "iterate and delete nodes");

  free(html);
  cmark_iter_free(iter);
  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_literal(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_literal(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_literal(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, CMARK_OPT_DEFAULT);
  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, CMARK_OPT_DEFAULT);
  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);
}

static void custom_nodes(test_batch_runner *runner) {
  char *html;
  char *man;
  cmark_node *doc = cmark_node_new(CMARK_NODE_DOCUMENT);
  cmark_node *p = cmark_node_new(CMARK_NODE_PARAGRAPH);
  cmark_node_append_child(doc, p);
  cmark_node *ci = cmark_node_new(CMARK_NODE_CUSTOM_INLINE);
  cmark_node *str1 = cmark_node_new(CMARK_NODE_TEXT);
  cmark_node_set_literal(str1, "Hello");
  OK(runner, cmark_node_append_child(ci, str1), "append1");
  OK(runner, cmark_node_set_on_enter(ci, "<ON ENTER|"), "set_on_enter");
  OK(runner, cmark_node_set_on_exit(ci, "|ON EXIT>"), "set_on_exit");
  STR_EQ(runner, cmark_node_get_on_enter(ci), "<ON ENTER|", "get_on_enter");
  STR_EQ(runner, cmark_node_get_on_exit(ci), "|ON EXIT>", "get_on_exit");
  cmark_node_append_child(p, ci);
  cmark_node *cb = cmark_node_new(CMARK_NODE_CUSTOM_BLOCK);
  cmark_node_set_on_enter(cb, "<on enter|");
  // leave on_exit unset
  STR_EQ(runner, cmark_node_get_on_exit(cb), "", "get_on_exit (empty)");
  cmark_node_append_child(doc, cb);

  html = cmark_render_html(doc, CMARK_OPT_DEFAULT);
  STR_EQ(runner, html, "<p><ON ENTER|Hello|ON EXIT></p>\n<on enter|\n",
         "render_html");
  free(html);

  man = cmark_render_man(doc, CMARK_OPT_DEFAULT, 0);
  STR_EQ(runner, man, ".PP\n<ON ENTER|Hello|ON EXIT>\n<on enter|\n",
         "render_man");
  free(man);

  cmark_node_free(doc);
}

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_ITEM;
  int top_level_blocks =
      (1 << CMARK_NODE_BLOCK_QUOTE) | (1 << CMARK_NODE_LIST) |
      (1 << CMARK_NODE_CODE_BLOCK) | (1 << CMARK_NODE_HTML_BLOCK) |
      (1 << CMARK_NODE_PARAGRAPH) | (1 << CMARK_NODE_HEADING) |
      (1 << CMARK_NODE_THEMATIC_BREAK);
  int all_inlines = (1 << CMARK_NODE_TEXT) | (1 << CMARK_NODE_SOFTBREAK) |
                    (1 << CMARK_NODE_LINEBREAK) | (1 << CMARK_NODE_CODE) |
                    (1 << CMARK_NODE_HTML_INLINE) | (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_ITEM, top_level_blocks);
  test_content(runner, CMARK_NODE_CODE_BLOCK, 0);
  test_content(runner, CMARK_NODE_HTML_BLOCK, 0);
  test_content(runner, CMARK_NODE_PARAGRAPH, all_inlines);
  test_content(runner, CMARK_NODE_HEADING, all_inlines);
  test_content(runner, CMARK_NODE_THEMATIC_BREAK, 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_CODE, 0);
  test_content(runner, CMARK_NODE_HTML_INLINE, 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_OPT_DEFAULT);

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

  cmark_node *emph = cmark_node_next(string);
  html = cmark_render_html(emph, CMARK_OPT_DEFAULT);
  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, CMARK_OPT_DEFAULT);
  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) {
  size_t len = strlen(utf8);

  for (size_t 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 (size_t i = pos + 1; i < len; ++i) {
      strcat(expected, UTF8_REPL);
    }
    strcat(expected, "))))</p>\n");

    char *html =
        cmark_markdown_to_html(buf, strlen(buf), CMARK_OPT_VALIDATE_UTF8);
    STR_EQ(runner, html, expected, "invalid utf8 continuation byte %d/%d", pos,
           len);
    free(html);
  }
}

static void line_endings(test_batch_runner *runner) {
  // Test list with different line endings
  static const char list_with_endings[] = "- a\n- b\r\n- c\r- d";
  char *html = cmark_markdown_to_html(
      list_with_endings, sizeof(list_with_endings) - 1, CMARK_OPT_DEFAULT);
  STR_EQ(runner, html,
         "<ul>\n<li>a</li>\n<li>b</li>\n<li>c</li>\n<li>d</li>\n</ul>\n",
         "list with different line endings");
  free(html);

  static const char crlf_lines[] = "line\r\nline\r\n";
  html = cmark_markdown_to_html(crlf_lines, sizeof(crlf_lines) - 1,
                                CMARK_OPT_DEFAULT | CMARK_OPT_HARDBREAKS);
  STR_EQ(runner, html, "<p>line<br />\nline</p>\n",
         "crlf endings with CMARK_OPT_HARDBREAKS");
  free(html);

  static const char no_line_ending[] = "```\nline\n```";
  html = cmark_markdown_to_html(no_line_ending, sizeof(no_line_ending) - 1,
                                CMARK_OPT_DEFAULT);
  STR_EQ(runner, html, "<pre><code>line\n</code></pre>\n",
         "fenced code block with no final newline");
  free(html);
}

static void numeric_entities(test_batch_runner *runner) {
  test_md_to_html(runner, "&#0;", "<p>" UTF8_REPL "</p>\n",
                  "Invalid numeric entity 0");
  test_md_to_html(runner, "&#55295;", "<p>\xED\x9F\xBF</p>\n",
                  "Valid numeric entity 0xD7FF");
  test_md_to_html(runner, "&#xD800;", "<p>" UTF8_REPL "</p>\n",
                  "Invalid numeric entity 0xD800");
  test_md_to_html(runner, "&#xDFFF;", "<p>" UTF8_REPL "</p>\n",
                  "Invalid numeric entity 0xDFFF");
  test_md_to_html(runner, "&#57344;", "<p>\xEE\x80\x80</p>\n",
                  "Valid numeric entity 0xE000");
  test_md_to_html(runner, "&#x10FFFF;", "<p>\xF4\x8F\xBF\xBF</p>\n",
                  "Valid numeric entity 0x10FFFF");
  test_md_to_html(runner, "&#x110000;", "<p>" UTF8_REPL "</p>\n",
                  "Invalid numeric entity 0x110000");
  test_md_to_html(runner, "&#x80000000;", "<p>" UTF8_REPL "</p>\n",
                  "Invalid numeric entity 0x80000000");
  test_md_to_html(runner, "&#xFFFFFFFF;", "<p>" UTF8_REPL "</p>\n",
                  "Invalid numeric entity 0xFFFFFFFF");
  test_md_to_html(runner, "&#99999999;", "<p>" UTF8_REPL "</p>\n",
                  "Invalid numeric entity 99999999");

  test_md_to_html(runner, "&#;", "<p>&amp;#;</p>\n",
                  "Min decimal entity length");
  test_md_to_html(runner, "&#x;", "<p>&amp;#x;</p>\n",
                  "Min hexadecimal entity length");
  test_md_to_html(runner, "&#999999999;", "<p>&amp;#999999999;</p>\n",
                  "Max decimal entity length");
  test_md_to_html(runner, "&#x000000041;", "<p>&amp;#x000000041;</p>\n",
                  "Max hexadecimal entity length");
}

static void test_safe(test_batch_runner *runner) {
  // Test safe mode
  static const char raw_html[] = "<div>\nhi\n</div>\n\n<a>hi</"
                                 "a>\n[link](JAVAscript:alert('hi'))\n![image]("
                                 "file:my.js)\n";
  char *html = cmark_markdown_to_html(raw_html, sizeof(raw_html) - 1,
                                      CMARK_OPT_DEFAULT | CMARK_OPT_SAFE);
  STR_EQ(runner, html, "<!-- raw HTML omitted -->\n<p><!-- raw HTML omitted "
                       "-->hi<!-- raw HTML omitted -->\n<a "
                       "href=\"\">link</a>\n<img src=\"\" alt=\"image\" "
                       "/></p>\n",
         "input with raw HTML and dangerous links");
  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),
                                      CMARK_OPT_VALIDATE_UTF8);
  STR_EQ(runner, html, expected_html, msg);
  free(html);
}

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

  version(runner);
  constructor(runner);
  accessors(runner);
  node_check(runner);
  iterator(runner);
  iterator_delete(runner);
  create_tree(runner);
  custom_nodes(runner);
  hierarchy(runner);
  parser(runner);
  render_html(runner);
  utf8(runner);
  line_endings(runner);
  numeric_entities(runner);
  test_cplusplus(runner);
  test_safe(runner);

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

  return retval;
}