<?php
/*
 * @copyright 2016-2020 Matias De lellis <mati86dl@gmail.com>
 *
 * @author 2016 Matias De lellis <mati86dl@gmail.com>
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace OCA\QuickNotes\Service;

use OCA\QuickNotes\Db\Attach;
use OCA\QuickNotes\Db\AttachMapper;

use OCA\QuickNotes\Db\Color;
use OCA\QuickNotes\Db\ColorMapper;

use OCA\QuickNotes\Db\Note;
use OCA\QuickNotes\Db\NoteMapper;

use OCA\QuickNotes\Db\NoteTag;
use OCA\QuickNotes\Db\NoteTagMapper;

use OCA\QuickNotes\Db\NoteShare;
use OCA\QuickNotes\Db\NoteShareMapper;

use OCA\QuickNotes\Db\Tag;
use OCA\QuickNotes\Db\TagMapper;

use OCA\QuickNotes\Service\FileService;


class NoteService {

	private $notemapper;
	private $notetagmapper;
	private $colormapper;
	private $noteShareMapper;
	private $attachMapper;
	private $tagmapper;
	private $fileService;

	public function __construct(NoteMapper      $notemapper,
	                            NoteTagMapper   $notetagmapper,
	                            NoteShareMapper $noteShareMapper,
	                            ColorMapper     $colormapper,
	                            AttachMapper    $attachMapper,
	                            TagMapper       $tagmapper,
	                            FileService     $fileService)
	{
		$this->notemapper      = $notemapper;
		$this->notetagmapper   = $notetagmapper;
		$this->colormapper     = $colormapper;
		$this->noteShareMapper = $noteShareMapper;
		$this->attachMapper    = $attachMapper;
		$this->tagmapper       = $tagmapper;
		$this->fileService     = $fileService;
	}

	/**
	 * @NoAdminRequired
	 */
	 public function getAll(string $userId): array {
		$notes = $this->notemapper->findAll($userId);

		// Set shares with others.
		foreach($notes as $note) {
			$note->setIsShared(false);
			$note->setSharedWith($this->noteShareMapper->getSharesForNote($note->getId()));
		}

		// Get shares from others.
		$shares = [];
		$sharedEntries = $this->noteShareMapper->findForUser($userId);
		foreach($sharedEntries as $sharedEntry) {
			$sharedNote = $this->notemapper->findShared($sharedEntry->getNoteId());
			$sharedNote->setIsShared(true);

			$sharedEntry->setUserId($sharedNote->getUserId());
			$sharedNote->setSharedBy([$sharedEntry]);
			$shares[] = $sharedNote;
		}

		// Attahch shared notes from others to same response
		$notes = array_merge($notes, $shares);

		// Set tags to response.
		foreach($notes as $note) {
			$note->setTags($this->tagmapper->getTagsForNote($userId, $note->getId()));
		}

		// Insert color to response
		foreach ($notes as $note) {
			$note->setColor($this->colormapper->find($note->getColorId())->getColor());
		}

		// Insert pin to response
		foreach ($notes as $note) {
			$note->setIsPinned($note->getPinned() ? true : false);
		}

		// Insert attachts to response.
		foreach ($notes as $note) {
			$attachts = $this->attachMapper->findFromNote($userId, $note->getId());
			foreach ($attachts as $attach) {
				$attach->setPreviewUrl($this->fileService->getPreviewUrl($attach->getFileId(), 512));
				$attach->setRedirectUrl($this->fileService->getRedirectToFileUrl($attach->getFileId()));
			}
			$note->setAttachts($attachts);
		}

		return $notes;
	}

	/**
	 * @param string $userId
	 * @param int $id
	 */
	public function get(string $userId, int $id): ?Note {
		try {
			return $this->notemapper->find($id, $userId);
		} catch(Exception $e) {
			return null;
		}
	}

	/**
	 * @param string $userId
	 * @param string $title
	 * @param string $content
	 * @param string $color
	 */
	public function create(string $userId, string $title, string $content, string $color = "#F7EB96"): Note {
		// Get color or append it
		if ($this->colormapper->colorExists($color)) {
			$hcolor = $this->colormapper->findByColor($color);
		} else {
			$hcolor = new Color();
			$hcolor->setColor($color);
			$hcolor = $this->colormapper->insert($hcolor);
		}

		// Create note and insert it
		$note = new Note();

		$note->setTitle($title);
		$note->setContent($content);
		$note->setTimestamp(time());
		$note->setColorId($hcolor->id);
		$note->setUserId($userId);

		$newNote = $this->notemapper->insert($note);

		// Insert true color pin and tags to response
		$newNote->setColor($hcolor->getColor());
		$newNote->setIsPinned(false);
		$newNote->setTags([]);
		$newNote->setAttachts([]);

		return $newNote;
	}

	/**
	 * @param string userId
	 * @param int $id
	 * @param string $title
	 * @param string $content
	 * @param array $attachts
	 * @param bool $pinned
	 * @param array $tags
	 * @param array $shares
	 * @param string $color
	 */
	public function update(string $userId,
	                       int    $id,
	                       string $title,
	                       string $content,
	                       array  $attachts,
	                       bool   $pinned,
	                       array  $tags,
	                       array  $shares,
	                       string $color): ?Note
	{
		// Get current Note and Color.
		$note = $this->get($userId, $id);
		if (is_null($note))
			return null;

		$oldcolorid = $note->getColorId();

		// Get new Color or append it.
		if ($this->colormapper->colorExists($color)) {
			$hcolor = $this->colormapper->findByColor($color);
		} else {
			$hcolor = new Color();
			$hcolor->setColor($color);
			$hcolor = $this->colormapper->insert($hcolor);
		}

		// Delete old attachts
		$dbAttachts = $this->attachMapper->findFromNote($userId, $id);
		foreach ($dbAttachts as $dbAttach) {
			$delete = true;
			foreach ($attachts as $attach) {
				if ($dbAttach->getFileId() === $attach['file_id']) {
					$delete = false;
					break;
				}
			}
			if ($delete) {
				$this->attachMapper->delete($dbAttach);
			}
		}

		// Add new attachts
		foreach ($attachts as $attach) {
			if (!$this->attachMapper->fileAttachExists($userId, $id, $attach['file_id'])) {
				$hAttach = new Attach();
				$hAttach->setUserId($userId);
				$hAttach->setNoteId($id);
				$hAttach->setFileId($attach['file_id']);
				$hAttach->setCreatedAt(time());
				$this->attachMapper->insert($hAttach);
			}
		}

		// Delete old shares
		$dbShares = $this->noteShareMapper->getSharesForNote($id);
		foreach ($dbShares as $dbShare) {
			$delete = true;
			foreach ($shares as $share) {
				if ($dbShare->getSharedUser() === $share['name']) {
					$delete = false;
					break;
				}
			}
			if ($delete) {
				$this->noteShareMapper->delete($dbShare);
			}
		}

		// Add new shares
		foreach ($shares as $share) {
			if (!$this->noteShareMapper->existsByNoteAndUser($id, $share['name'])) {
				$hShare = new NoteShare();
				$hShare->setNoteId($id);
				$hShare->setSharedUser($share['name']);
				$this->noteShareMapper->insert($hShare);
			}
		}

		// Delete old tag relations
		$dbTags = $this->tagmapper->getTagsForNote($userId, $id);
		foreach ($dbTags as $dbTag) {
			$delete = true;
			foreach ($tags as $tag) {
				if ($dbTag->getId() === $tag['id']) {
					$delete = false;
					break;
				}
			}
			if ($delete) {
				$hnotetag = $this->notetagmapper->findNoteTag($userId, $id, $dbTag->getId());
				$this->notetagmapper->delete($hnotetag);
			}
		}

		// Add new tags and update relations.
		foreach ($tags as $tag) {
			if (!$this->tagmapper->tagExists($userId, $tag['name'])) {
				$htag = new Tag();
				$htag->setName($tag['name']);
				$htag->setUserId($userId);
				$htag = $this->tagmapper->insert($htag);
			}
			else {
				$htag = $this->tagmapper->getTag($userId, $tag['name']);
			}

			if (!$this->notetagmapper->noteTagExists($userId, $id, $htag->getId())) {
				$noteTag = new NoteTag();
				$noteTag->setNoteId($id);
				$noteTag->setTagId($htag->getId());
				$noteTag->setUserId($userId);
				$this->notetagmapper->insert($noteTag);
			}
		}

		// Set new info on Note
		$note->setTitle($title);
		$note->setContent($content);
		$note->setPinned($pinned ? 1 : 0);
		$note->setTimestamp(time());
		$note->setColorId($hcolor->id);

		// Update note.
		$newnote = $this->notemapper->update($note);

		// Insert true color and pin to response
		$newnote->setColor($hcolor->getColor());
		$newnote->setIsPinned($note->getPinned() ? true : false);

		// Fill new tags
		$newnote->setTags($this->tagmapper->getTagsForNote($userId, $newnote->getId()));

		// Fill attachts to response
		$attachts = $this->attachMapper->findFromNote($userId, $newnote->getId());
		foreach ($attachts as $attach) {
			$attach->setPreviewUrl($this->fileService->getPreviewUrl($attach->getFileId(), 512));
			$attach->setRedirectUrl($this->fileService->getRedirectToFileUrl($attach->getFileId()));
		}
		$newnote->setAttachts($attachts);

		// Fill shared with with others
		$newnote->setIsShared(false);
		$newnote->setSharedWith($this->noteShareMapper->getSharesForNote($newnote->getId()));

		//  Remove old color if necessary
		if (($oldcolorid !== $hcolor->getId()) &&
		    (!$this->notemapper->colorIdCount($oldcolorid))) {
			$oldcolor = $this->colormapper->find($oldcolorid);
			$this->colormapper->delete($oldcolor);
		}

		// Purge orphan tags.
		$this->tagmapper->dropOld();

		return $newnote;
	}

	/**
	 * @param string $userId
	 * @param int $id
	 */
	public function destroy($userId, $id) {
		// Get Note and Color
		try {
			$note = $this->notemapper->find($id, $userId);
		} catch(Exception $e) {
			return;
		}
		$oldcolorid = $note->getColorId();

		$this->noteShareMapper->deleteByNoteId($note->getId());

		// Delete note.
		$this->notemapper->delete($note);

		// Delete Color if necessary
		if (!$this->notemapper->colorIdCount($oldcolorid)) {
			$oldcolor = $this->colormapper->find($oldcolorid);
			$this->colormapper->delete($oldcolor);
		}

		$attachts = $this->attachMapper->findFromNote($userId, $id);
		foreach ($attachts as $attach) {
			$this->attachMapper->delete($attach);
		}
	}

	/**
	 * @NoAdminRequired
	 */
	public function getUserGroupsAndUsersWithShare($userId, $noteId) {
		$userMgr = \OC::$server->getUserManager();
		$grpMgr = \OC::$server->getGroupManager();
		$users = array();
		$groups = array();
		if($grpMgr->isAdmin($userId)) {
			$igroups = $grpMgr->search("");
			$iusers = $userMgr->search("");
			foreach($igroups as $g) {
				$groups[] = $g->getGID();
			}
			foreach($iusers as $u) {
				$users[] = $u->getUID();
			}
		} else {
			$igroups = $grpMgr->getUserGroups($userMgr->get($userId));
			foreach($igroups as $g) {
				$iusers = $g->getUsers();
				foreach($iusers as $u) {
					$users[] = $u->getUID();
				}
				$groups[] = $g->getGID();
			}
		}

		$users = array_unique($users);
		if(($i = array_search($userId, $users)) !== false) {
			unset($users[$i]);
		}
		$pos_users = array();
		$pos_groups = array();
		$shares = $this->noteShareMapper->getSharesForNote($noteId);
		foreach($shares as $s) {
			$shareType = $s->getSharedUser();
			if(strlen($shareType) !== 0) {
				if(($i = array_search($shareType, $users)) !== false) {
					unset($users[$i]);
					$pos_users[] = $shareType;
				}
			} else {
				$shareType = $s->getSharedGroup();
				if(($i = array_search($shareType, $groups)) !== false) {
					unset($groups[$i]);
					$pos_groups[] = $shareType;
				}
			}
		}
		return ['groups' => $groups, 'users' => $users, 'posGroups' => $pos_groups, 'posUsers' => $pos_users];
	}

	/**
	 */
	public function addGroupShare($groupId, $noteId) {
	    $share = new NoteShare();
	    $share->setSharedGroup($groupId);
	    $share->setNoteId($noteId);
	    $this->noteShareMapper->insert($share);
	}

	/**
	 */
	public function removeGroupShare($groupId, $noteId) {
		$share = $this->noteShareMapper->findByNoteAndGroup($noteId, $groupId);
		$this->noteShareMapper->delete($share);
	}

	/**
	 */
	public function addUserShare($userId, $noteId) {
		$share = new NoteShare();
		$share->setSharedUser($userId);
		$share->setNoteId($noteId);
		$this->noteShareMapper->insert($share);
	}

	/**
	 */
	public function removeUserShare($userId, $noteId) {
		$share = $this->noteShareMapper->findByNoteAndUser($noteId, $userId);
		$this->noteShareMapper->delete($share);
	}
}