<?php

namespace Kanboard\Plugin\BulkMoveTasks\Controller;

use Kanboard\Controller\BaseController;
use Kanboard\Core\Controller\AccessForbiddenException;
use Kanboard\Model\TaskModel;

/**
 * Move every task of a board column (within one swimlane) to another column.
 */
class BulkMoveController extends BaseController
{
    /**
     * Render the modal: pick the destination column.
     */
    public function show()
    {
        $project = $this->getProject();
        $this->checkAccess($project['id']);

        $column_id = $this->request->getIntegerParam('column_id');
        $swimlane_id = $this->request->getIntegerParam('swimlane_id');

        // Offer every column of the project except the source one as a destination.
        $columns = $this->columnModel->getList($project['id']);
        unset($columns[$column_id]);

        $this->response->html($this->template->render('bulkMoveTasks:board/move_all_tasks', array(
            'project' => $project,
            'nb_tasks' => $this->taskFinderModel->countByColumnAndSwimlaneId($project['id'], $column_id, $swimlane_id),
            'column' => $this->columnModel->getColumnTitleById($column_id),
            'swimlane' => $this->swimlaneModel->getNameById($swimlane_id),
            'columns_list' => $columns,
            'values' => array(
                'column_id' => $column_id,
                'swimlane_id' => $swimlane_id,
            ),
        )));
    }

    /**
     * Perform the move and return to the board.
     */
    public function move()
    {
        $project = $this->getProject();
        $this->checkAccess($project['id']);

        $values = $this->request->getValues();
        $src_column_id = isset($values['column_id']) ? (int) $values['column_id'] : 0;
        $dst_column_id = isset($values['dst_column_id']) ? (int) $values['dst_column_id'] : 0;
        $swimlane_id = isset($values['swimlane_id']) ? (int) $values['swimlane_id'] : 0;

        $columns = $this->columnModel->getList($project['id']);

        if ($src_column_id === 0 || $dst_column_id === 0 || $src_column_id === $dst_column_id || ! isset($columns[$dst_column_id])) {
            $this->flash->failure(t('Please choose a different destination column.'));
        } else {
            $moved = $this->moveAllTasks($project['id'], $src_column_id, $dst_column_id, $swimlane_id);
            $this->flash->success(t('%d task(s) moved from "%s" to "%s".', $moved, $this->columnModel->getColumnTitleById($src_column_id), $this->columnModel->getColumnTitleById($dst_column_id)));
        }

        $this->response->redirect($this->helper->url->to('BoardViewController', 'show', array('project_id' => $project['id'])));
    }

    /**
     * Move every open task of (source column, swimlane) to the end of the
     * destination column, keeping their relative order. Returns the count moved.
     */
    private function moveAllTasks($project_id, $src_column_id, $dst_column_id, $swimlane_id)
    {
        $task_ids = $this->db->table(TaskModel::TABLE)
            ->eq('project_id', $project_id)
            ->eq('column_id', $src_column_id)
            ->eq('swimlane_id', $swimlane_id)
            ->eq('is_active', TaskModel::STATUS_OPEN)
            ->asc('position')
            ->findAllByColumn('id');

        $position = $this->taskFinderModel->countByColumnAndSwimlaneId($project_id, $dst_column_id, $swimlane_id) + 1;
        $moved = 0;

        foreach ($task_ids as $task_id) {
            if ($this->taskPositionModel->movePosition($project_id, $task_id, $dst_column_id, $position, $swimlane_id)) {
                $position++;
                $moved++;
            }
        }

        return $moved;
    }

    /**
     * Allow only users who can modify tasks in this project.
     */
    private function checkAccess($project_id)
    {
        if (! $this->helper->user->hasProjectAccess('TaskModificationController', 'update', $project_id)) {
            throw new AccessForbiddenException();
        }
    }
}