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<?php

function comicpress_get_first_comic() {
return comicpress_get_terminal_post_in_category(comicpress_all_comic_categories_string(), true);
}

function comicpress_get_last_comic() {
return comicpress_get_terminal_post_in_category(comicpress_all_comic_categories_string(), false);
}

function comicpress_get_previous_comic($in_same_category = false, $category = null) { return comicpress_get_adjacent_comic($category, true, $in_same_category); }

function comicpress_get_next_comic($in_same_category = false, $category = null) { return comicpress_get_adjacent_comic($category, false, $in_same_category); }


/**
* Get the hyperlink to the first comic post in the database.
* @return string The hyperlink to the first comic post, or false.
*/
function comicpress_get_first_comic_permalink() {
$terminal = comicpress_get_first_comic();
if (!empty($terminal))
return !empty($terminal) ? apply_filters('comicpress_get_first_comic_permalink',get_permalink($terminal->ID)) : false;
}

/**
* Get the hyperlink to the last comic post in the database.
* @return string The hyperlink to the first comic post, or false.
*/
function comicpress_get_last_comic_permalink() {
$terminal = comicpress_get_last_comic();
return !empty($terminal) ? apply_filters('comicpress_get_last_comic_permalink',get_permalink($terminal->ID)) : false;
}

/**
* Get the link to the previous comic from the current one.
*/
function comicpress_previous_comic_link($format, $link) {
previous_post_link($format, $link, false, comicpress_all_blog_categories_string());
}

/**
* Get the link to the next comic from the current one.
*/
function comicpress_next_comic_link($format, $link) {
next_post_link($format, $link, false, comicpress_all_blog_categories_string());
}

/**
* This is function comicpress_get_next_comic_permalink
*
* @return mixed false if no next comic permalink, else return the permalink
*
*/
function comicpress_get_next_comic_permalink($in_same_category = false) {
$next_comic = comicpress_get_next_comic($in_same_category);
if (is_object($next_comic)) {
if (isset($next_comic->ID)) {
return apply_filters('comicpress_get_next_comic_permalink',get_permalink($next_comic->ID));
}
}
return false;
}

/**
* This is function comicpress_get_previous_comic_permalink
*
* @return mixed false if there is no permalink or next previous comic
*
*/
function comicpress_get_previous_comic_permalink($in_same_category = false) {
$prev_comic = comicpress_get_previous_comic($in_same_category);
if (is_object($prev_comic)) {
if (isset($prev_comic->ID)) {
return apply_filters('comicpress_get_previous_comic_permalink',get_permalink($prev_comic->ID));
}
}
return false;
}

/**
* Get the adjacent comic from the current one.
* @param int $category The category to use.
* @param boolean $previous True if the previous chronological comic should be retrieved.
* @return array The WordPress post object for the comic post.
*/
function comicpress_get_adjacent_comic($category, $previous = false, $in_same_category = false) {
if (!empty($category)) {
$categories_to_exclude = comicpress_get_string_to_exclude_all_but_provided_categories($category);
} else {
$categories_to_exclude = comicpress_all_blog_categories_string();
}
return get_adjacent_post($in_same_category, $categories_to_exclude, $previous);
}

/**
* Find the terminal post in a specific category.
*/
function comicpress_get_terminal_post_in_category($categoryID, $first = true, $storyline = false) {
global $post;

if (empty($categoryID)) $categoryID = comicpress_themeinfo('comiccat');

$excluded_cats = array();

if ($storyline) {
// echo "CAT ID: ".$categoryID."<br />";
$excluded_catlist = get_categories(array('child_of' => $categoryID));
foreach ($excluded_catlist as $catlist) {
$excluded_cats[] = $catlist->cat_ID;
}
}

$sortOrder = $first ? "asc" : "desc";

$categoryID = explode(',', $categoryID);


if (!empty($excluded_cats)) {
$args = array(
'category__in' => $categoryID,
'category__not_in' => $excluded_cats,
'order' => $sortOrder,
'posts_per_page' => 1
);
} else {;
$args = array(
'category__in' => $categoryID,
'order' => $sortOrder,
'posts_per_page' => 1
);
}

$terminalComicQuery = new WP_Query($args);

$terminalPost = false;
if ($terminalComicQuery->have_posts()) {
$terminalPost = reset($terminalComicQuery->posts);
}

return $terminalPost;
}

/**
* Find the first post in the storyline prior to the current one.
*/
function comicpress_get_previous_storyline_start() {
global $post;

if (($category_id = comicpress_get_adjacent_storyline_category_id(false)) !== false) {

$terminal_post = comicpress_get_terminal_post_in_category($category_id, true, true);

if ($post->ID == $terminal_post->ID) return false;

$category = get_the_category($post->ID);

$current_terminal_post = comicpress_get_terminal_post_in_category($category[0]->cat_ID);

if ($current_terminal_post->ID == $post->ID) {
return $terminal_post;
} else {
return $current_terminal_post;
}
}
return false;
}

function comicpress_get_previous_storyline_start_permalink() {
$prev_story = comicpress_get_previous_storyline_start();
if (is_object($prev_story)) {
if (isset($prev_story->ID)) {
return get_permalink($prev_story->ID);
}
}
return false;
}

/**
* Find the first post in the storyline following to the current one.
*/
function comicpress_get_next_storyline_start() {
if (($category_id = comicpress_get_adjacent_storyline_category_id(true)) !== false) {
return comicpress_get_terminal_post_in_category($category_id, true, true);
}
return false;
}

function comicpress_get_next_storyline_start_permalink() {
$next_story = comicpress_get_next_storyline_start();
if (is_object($next_story)) {
if (isset($next_story->ID)) {
return get_permalink($next_story->ID);
}
}
return false;
}

function comicpress_get_adjacent_storyline_category_id($next = false) {
global $post, $category_tree;
$categories = get_the_category($post->ID);
if (is_array($categories)) {
$category_id = $categories[0]->cat_ID;
for ($i = 0, $il = count($category_tree); $i < $il; ++$i) {
$storyline_category_id = end(explode("/", $category_tree[$i]));

if ($storyline_category_id == $category_id) {
$target_index = false;
if ($next) {
$target_index = $i + 1;
} else {
$target_index = $i - 1;
}
if (isset($category_tree[$target_index])) {
return end(explode('/', $category_tree[$target_index]));
}
}
}
}
return false;
}

function comicpress_get_terminal_post_of_chapter_permalink($first = true) {
global $post;
$category = get_the_category($post->ID);
$term_post = comicpress_get_terminal_post_in_category($category[0]->cat_ID, $first, false);
if (is_object($term_post)) {
if (isset($term_post->ID)) {
return get_permalink($term_post->ID);
}
}
return false;
}

?>
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