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<?php

    namespace Inteve\Navigation;

    use Nette\Utils\Strings;


    class Navigation
    {
        /** @var array */
        private $pages = array();

        /** @var array */
        private $items = array();

        /** @var array */
        private $beforeItems = array();

        /** @var array */
        private $afterItems = array();

        /** @var string|NULL */
        private $currentPage;

        /** @var string|NULL */
        private $defaultPage;


        /**
         * @param  string|NULL
         * @return self
         */
        public function setDefaultPage($defaultPage)
        {
            $this->defaultPage = $defaultPage !== NULL ? self::formatPageId($defaultPage) : NULL;
            return $this;
        }


        /**
         * @param  string|NULL
         * @return self
         */
        public function setCurrentPage($currentPage)
        {
            $this->currentPage = $currentPage !== NULL ? self::formatPageId($currentPage) : NULL;
            return $this;
        }


        /**
         * @return string|NULL
         */
        public function getCurrentPage()
        {
            return isset($this->currentPage) ? $this->currentPage : $this->defaultPage;
        }


        /**
         * @param  string
         * @return bool
         */
        public function isPageCurrent($page)
        {
            return self::formatPageId($page) === $this->getCurrentPage();
        }


        /**
         * @param  string
         * @return bool
         */
        public function isPageActive($page)
        {
            $page = self::formatPageId($page);
            $currentPage = $this->getCurrentPage();

            if ($currentPage === NULL) {
                return FALSE;
            }

            if ($page === $currentPage || $page === '') {
                return TRUE;
            }

            return Strings::startsWith($currentPage, "$page/");
        }


        /**
         * @param  string
         * @param  string|NavigationItem
         * @param  string|NULL
         * @param  string|NULL
         * @return self
         * @throws DuplicateException
         */
        public function addPage($id, $label, $link = NULL, array $parameters = NULL)
        {
            $id = self::formatPageId($id);

            if (isset($this->pages[$id])) {
                throw new DuplicateException("Page '$id' already exists.");
            }

            $this->pages[$id] = $this->createItem($label, $link, $parameters);
            return $this;
        }


        /**
         * @param  string
         * @param  string
         * @return self
         */
        public function setPageLabel($pageId, $label)
        {
            $page = $this->getPage($pageId);
            $page->setLabel($label);
            return $this;
        }


        /**
         * @param  string
         * @return NavigationItem
         * @throws MissingException
         */
        public function getPage($pageId)
        {
            $pageId = self::formatPageId($pageId);

            if (!isset($this->pages[$pageId])) {
                throw new MissingException("Page '$pageId' not found.");
            }

            return $this->pages[$pageId];
        }


        /**
         * @return NavigationItem[]  [pageId => NavigationItem]
         */
        public function getPages()
        {
            return $this->pages;
        }


        /**
         * @param  string|NavigationItem
         * @param  string|NULL
         * @param  string|NULL
         * @return self
         */
        public function addItem($label, $link = NULL, array $parameters = NULL)
        {
            $this->items[] = $this->createItem($label, $link, $parameters);
            return $this;
        }


        /**
         * @param  string
         * @param  string|NavigationItem
         * @param  string|NULL
         * @param  string|NULL
         * @return self
         */
        public function addItemBefore($pageId, $label, $link = NULL, array $parameters = NULL)
        {
            $pageId = self::formatPageId($pageId);
            $this->beforeItems[$pageId][] = $this->createItem($label, $link, $parameters);
            return $this;
        }


        /**
         * @param  string
         * @param  string|NavigationItem
         * @param  string|NULL
         * @param  string|NULL
         * @return self
         */
        public function addItemAfter($pageId, $label, $link = NULL, array $parameters = NULL)
        {
            $pageId = self::formatPageId($pageId);
            $this->afterItems[$pageId][] = $this->createItem($label, $link, $parameters);
            return $this;
        }


        /**
         * Returns breadcrumbs for current page.
         * @return array
         */
        public function getBreadcrumbs()
        {
            // ziskame aktualni stranku, postupne z jejiho ID urezavame casti, pridavame odpovidajici stranky a itemy
            $items = array();
            $currentPage = $this->getCurrentPage();

            if (isset($currentPage)) {
                do {
                    if (isset($this->pages[$currentPage])) { // pokud stranka existuje
                        if (isset($this->afterItems[$currentPage])) { // array_reverse
                            $items = array_merge($items, array_reverse($this->afterItems[$currentPage]));
                        }

                        $items[] = $this->pages[$currentPage];

                        if (isset($this->beforeItems[$currentPage])) { // array_reverse
                            $items = array_merge($items, array_reverse($this->beforeItems[$currentPage]));
                        }
                    }

                    // urizneme cast
                    if ($currentPage === '') {
                        break; // currentPage = FALSE
                    }

                    if (($pos = strrpos($currentPage, '/')) !== FALSE) {
                        $currentPage = substr($currentPage, 0, $pos);

                    } else {
                        $currentPage = '';
                    }

                } while ($currentPage !== FALSE);

                $items = array_reverse($items);
            }

            foreach ($this->items as $item) {
                $items[] = $item;
            }

            return $items;
        }


        /**
         * @param  string|NavigationItem
         * @param  string|NULL
         * @param  string|NULL
         * @return NavigationItem
         */
        private function createItem($label, $link = NULL, array $parameters = NULL)
        {
            if ($label instanceof NavigationItem) {
                return $label;

            } else {
                return new NavigationItem($label, $link, $parameters);
            }
        }


        /**
         * @param  string
         * @return string
         */
        public static function formatPageId($pageId)
        {
            return trim($pageId, '/');
        }
    }