<?php namespace Oxbow\Repos;


use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Str;
use Oxbow\Page;
use Oxbow\PageRevision;

class PageRepo
{
    protected $page;
    protected $pageRevision;

    /**
     * PageRepo constructor.
     * @param Page         $page
     * @param PageRevision $pageRevision
     */
    public function __construct(Page $page, PageRevision $pageRevision)
    {
        $this->page = $page;
        $this->pageRevision = $pageRevision;
    }

    public function idExists($id)
    {
        return $this->page->where('page_id', '=', $id)->count() > 0;
    }

    public function getById($id)
    {
        return $this->page->findOrFail($id);
    }

    public function getAll()
    {
        return $this->page->all();
    }

    public function getBySlug($slug, $bookId)
    {
        return $this->page->where('slug', '=', $slug)->where('book_id', '=', $bookId)->first();
    }

    public function newFromInput($input)
    {
        $page = $this->page->fill($input);
        return $page;
    }

    public function countBySlug($slug, $bookId)
    {
        return $this->page->where('slug', '=', $slug)->where('book_id', '=', $bookId)->count();
    }

    public function destroyById($id)
    {
        $page = $this->getById($id);
        $page->delete();
    }

    public function getBySearch($term, $whereTerms = [])
    {
        $terms = explode(' ', preg_quote(trim($term)));
        $pages = $this->page->fullTextSearch(['name', 'text'], $terms, $whereTerms);

        // Add highlights to page text.
        $words = join('|', $terms);
        //lookahead/behind assertions ensures cut between words
        $s = '\s\x00-/:-@\[-`{-~'; //character set for start/end of words

        foreach ($pages as $page) {
            preg_match_all('#(?<=[' . $s . ']).{1,30}((' . $words . ').{1,30})+(?=[' . $s . '])#uis', $page->text, $matches, PREG_SET_ORDER);
            //delimiter between occurrences
            $results = [];
            foreach ($matches as $line) {
                $results[] = htmlspecialchars($line[0], 0, 'UTF-8');
            }
            $matchLimit = 6;
            if (count($results) > $matchLimit) {
                $results = array_slice($results, 0, $matchLimit);
            }
            $result = join('... ', $results);

            //highlight
            $result = preg_replace('#' . $words . '#iu', "<span class=\"highlight\">\$0</span>", $result);
            if (strlen($result) < 5) {
                $result = $page->getExcerpt(80);
            }
            $page->searchSnippet = $result;
        }
        return $pages;
    }

    /**
     * Updates a page with any fillable data and saves it into the database.
     * @param Page $page
     * @param      $book_id
     * @param      $data
     * @return Page
     */
    public function updatePage(Page $page, $book_id, $data)
    {
        $page->fill($data);
        $page->slug = $this->findSuitableSlug($page->name, $book_id, $page->id);
        $page->text = strip_tags($page->html);
        $page->updated_by = Auth::user()->id;
        $page->save();
        $this->saveRevision($page);
        return $page;
    }

    /**
     * Saves a page revision into the system.
     * @param Page $page
     * @return $this
     */
    public function saveRevision(Page $page)
    {
        $lastRevision = $this->getLastRevision($page);
        if ($lastRevision && ($lastRevision->html === $page->html && $lastRevision->name === $page->name)) {
            return $page;
        }
        $revision = $this->pageRevision->fill($page->toArray());
        $revision->page_id = $page->id;
        $revision->created_by = Auth::user()->id;
        $revision->save();
        // Clear old revisions
        if ($this->pageRevision->where('page_id', '=', $page->id)->count() > 50) {
            $this->pageRevision->where('page_id', '=', $page->id)
                ->orderBy('created_at', 'desc')->skip(50)->take(5)->delete();
        }
        return $revision;
    }

    /**
     * Gets the most recent revision for a page.
     * @param Page $page
     * @return mixed
     */
    public function getLastRevision(Page $page)
    {
        return $this->pageRevision->where('page_id', '=', $page->id)
            ->orderBy('created_at', 'desc')->first();
    }

    /**
     * Gets a single revision via it's id.
     * @param $id
     * @return mixed
     */
    public function getRevisionById($id)
    {
        return $this->pageRevision->findOrFail($id);
    }

    /**
     * Checks if a slug exists within a book already.
     * @param            $slug
     * @param            $bookId
     * @param bool|false $currentId
     * @return bool
     */
    public function doesSlugExist($slug, $bookId, $currentId = false)
    {
        $query = $this->page->where('slug', '=', $slug)->where('book_id', '=', $bookId);
        if ($currentId) {
            $query = $query->where('id', '!=', $currentId);
        }
        return $query->count() > 0;
    }

    /**
     * Gets a suitable slug for the resource
     *
     * @param            $name
     * @param            $bookId
     * @param bool|false $currentId
     * @return string
     */
    public function findSuitableSlug($name, $bookId, $currentId = false)
    {
        $slug = Str::slug($name);
        while ($this->doesSlugExist($slug, $bookId, $currentId)) {
            $slug .= '-' . substr(md5(rand(1, 500)), 0, 3);
        }
        return $slug;
    }


}