<?php

namespace Icinga\Module\Graphite\Controllers;

use DirectoryIterator;
use Icinga\Exception\NotFoundError;
use Icinga\Module\Graphite\GraphiteChart;
use Icinga\Module\Graphite\GraphiteUtil;
use Icinga\Module\Graphite\GraphiteWeb;
use Icinga\Module\Graphite\GraphTemplate;
use Icinga\Module\Graphite\TemplateStore;
use Icinga\Web\Controller;
use Icinga\Web\Widget;

class ShowController extends Controller
{
    protected $baseUrl;

    protected $graphiteWeb;

    protected $templates;

    protected $templateSet;

    protected $template;

    protected $filters;

    protected $handledGraphParams = false;

    protected $templateStore;

    public function init()
    {
        $config = $this->Config();
        $this->templateStore = new TemplateStore();
        $this->baseUrl = $this->Config()->get('graphite', 'web_url');
        $graphite = $this->graphiteWeb = new GraphiteWeb($this->baseUrl);
        $this->template = $this->view->template = $this->loadTemplate();
        $this->params->shift('r');
    }

    public function overviewAction()
    {
        $this->handleDatasourceToggles();
        $this->handleGraphParams();
        // TODO: $max  = $query->getMaxValue();

        $this->view->tabs->add('overview', array(
            'label' => $this->translate('Graphite - Overview'),
            'url'   => $this->getRequest()->getUrl()
        ))->activate('overview');

        $this->view->filterColumn = $this->params->get('filterColumn');
        $this->view->filterValue  = $this->params->get('filterValue');

        $optional = array(null => '- please choose -');
        $any = array('*' => 'Show any');

        $this->view->templates = array_merge(
            $optional,
            $this->templateStore->enumTemplates()
        );

        if (! $template = $this->template) {
            return;
        }

        $varnames = GraphiteUtil::extractVariableNames($template->getFilterString());
        $varnames = array_combine($varnames, $varnames);

        $this->view->filterColumns = $optional + $varnames;

        if ($this->view->filterColumn) {
            if (array_key_exists($this->view->filterColumn, $this->view->filterColumns)) {

                $this->view->filterValues = $optional + $any + $this->graphiteWeb->select()
                    ->from($template->getFilterString())
                    ->listDistinct($this->view->filterColumn);
            }
        }

        if (! $this->view->filterColumn || ! $this->view->filterValue) {
            return;
        }

        $imgs = array();

        $title = $template->getTitle();
        if (false === strpos($title, '$')) {
            $template->setTitle('$hostname');
        } else {
            if (false === strpos($title, '$hostname')) {
                $template->setTitle('$hostname: ' . $template->getTitle());
            }
        }

        $query = $this->graphiteWeb->select()->from(
            $template->getFilterString()
        )->where($this->view->filterColumn, $this->view->filterValue);

        $view = $this->view;
        $imgParams = array(
            'template' => $view->templateName,
            'start'    => $view->start,
            'width'    => $view->width,
            'height'   => $view->height
        );

        if ($this->view->disabledDatasources) {
            $imgParams['disabled'] = $this->view->disabledDatasources;
        }

        $view->images = $query->getWrappedImageLinks($template, $imgParams);
    }

    public function graphAction()
    {
        $template = $this->loadTemplate();
        $title = $template->getTitle();
        if (false === strpos($title, '$')) {
            $template->setTitle('$hostname');
        } else {
            if (false === strpos($title, '$hostname')) {
                $template->setTitle('$hostname: ' . $template->getTitle());
            }
        }

        $query = $this->graphiteWeb
            ->select()
            ->from(
                $template->getFilterString()
            );

        foreach ($this->params->toArray() as $val) {
            $query->where($val[0], $val[1]);
        }

        $img = $this->applyGraphParams(current($query->getImages($template)))
            ->showLegend(false);
        
        $this->_helper->layout()->disableLayout();
        header('Content-Type: image/png');
        $this->view->image = $img->fetchImage();
    }

    public function hostAction()
    {
        $this->handleDatasourceToggles();
        $this->handleGraphParams();
        $hostname = $this->view->hostname = $this->params->get('host');
        if (! $hostname) {
            throw new NotFoundError('Host is required');
        }

        $view = $this->view;
        $this->getTabs()->add('host', array(
            'label' => $this->translate('Graphite - Single Host'),
            'url' => $this->getRequest()->getUrl()
        ))->activate('host');

        $imgs = array();
        $this->view->templates = array();

        foreach ($this->templateStore->loadTemplateSets() as $setname => $set) {

            $patterns = $set->getBasePatterns();
            if (! array_key_exists('icingaHost', $patterns)) continue;

            foreach ($set->loadTemplates() as $key => $template) {
                if (strpos($template->getFilterString(), '$service') !== false) continue;

                $imgParams = array(
                    'template' => $key,
                    'start'    => $view->start,
                    'width'    => $view->width,
                    'height'   => $view->height
                );

                if ($this->view->disabledDatasources) {
                    $imgParams['disabled'] = $this->view->disabledDatasources;
                    foreach ($this->view->disabledDatasources as $dis) {
                        if ($template->hasDatasource($dis)) {
                            $template->getDatasource($dis)->disable();
                        }
                    }
                }

                $this->view->templates[$key] = $template;

                $imgs[$key] = $this->graphiteWeb
                    ->select()
                    ->from($template->getFilterString())
                    ->where('hostname', $hostname)
                    ->getWrappedImageLinks($template, $imgParams);

            }
        }

        $view->images = $imgs;
    }

    public function serviceAction()
    {
        $this->handleDatasourceToggles();
        $this->handleGraphParams();
        $hostname = $this->view->hostname = $this->params->get('host');
        $service = $this->view->service = $this->params->get('service');
        if (! $hostname) {
            throw new NotFoundError('Host is required');
        }
        if (! $service) {
            throw new NotFoundError('Service is required');
        }
        $this->getTabs()->add('service', array(
            'label' => $this->translate('Graphite - Single service'),
            'url' => $this->getRequest()->getUrl()
        ))->activate('service');

        $view = $this->view;

        $imgs = array();
        $this->view->templates = array();

        foreach ($this->templateStore->loadTemplateSets() as $setname => $set) {

            $patterns = $set->getBasePatterns();
            if (! array_key_exists('icingaHost', $patterns)) continue;

            foreach ($set->loadTemplates() as $key => $template) {
                if (strpos($template->getFilterString(), '$service') === false) continue;

                $imgParams = array(
                    'template' => $key,
                    'start'    => $view->start,
                    'width'    => $view->width,
                    'height'   => $view->height
                );

                if ($this->view->disabledDatasources) {
                    $imgParams['disabled'] = $this->view->disabledDatasources;
                    foreach ($this->view->disabledDatasources as $dis) {
                        if ($template->hasDatasource($dis)) {
                            $template->getDatasource($dis)->disable();
                        }

                    }
                }

                $this->view->templates[$key] = $template;

                $imgs[$key] = $this->graphiteWeb
                    ->select()
                    ->from($template->getFilterString())
                    ->where('hostname', $hostname)
                    ->where('service',  $service)
                    ->getWrappedImageLinks($template, $imgParams);

            }
        }

        $view->images = $imgs;
    }

    public function XXXserviceAction()
    {
        $this->handleDatasourceToggles();
        $this->handleGraphParams();
        $hostname = $this->view->hostname = $this->params->get('host');
        $service = $this->view->service = $this->params->get('service');
        if (! $hostname) {
            throw new NotFoundError('Host is required');
        }
        if (! $service) {
            throw new NotFoundError('Service is required');
        }
        $this->getTabs()->add('service', array(
            'label' => $this->translate('Graphite - Single service'),
            'url' => $this->getRequest()->getUrl()
        ))->activate('service');

        $imgs = array();
        $this->view->templates = array();

        foreach ($this->templateStore->loadTemplateSets() as $setname => $set) {

            $patterns = $set->getBasePatterns();
            if (! array_key_exists('icingaService', $patterns)) continue;

            foreach ($set->loadTemplates() as $key => $template) {

                if (strpos($template->getFilterString(), '$service') === false) continue;

                $this->view->templates[$key] = $template;

                $imgs[$key] = $this->graphiteWeb
                    ->select()
                    ->from($template->getFilterString())
                    ->where('hostname', $hostname)
                    ->where('service',  $service)
                    ->getImages($template);

                foreach ($imgs[$key] as $img) {
                    $this->applyGraphParams($img)
                         ->showLegend(! $this->params->get('hideLegend', false));
                }
            }
        }

        $this->view->images = $imgs;
    }

    protected function loadTemplate()
    {
        $this->handleTemplateParams();
        if (! $this->view->templateName) {
            return false;
        }

        $template = $this->templateStore->loadTemplate($this->view->templateName);
        foreach ($this->view->disabledDatasources as $key) {
            $template->getDatasource($key)->disable();
        }

        return $template;
    }

    protected function handleTemplateParams()
    {
        $this->view->templateName = $this->params->get('template');
        $this->view->disabledDatasources = $this->params->getValues('disabled');
    }

    protected function handleGraphParams()
    {
        if ($this->handledGraphParams === false) {
            $this->handledGraphParams = true;
            $view = $this->view;
            $view->start  = $this->params->shift('start', '-1hours');
            $view->width  = $this->params->shift('width', '300');
            $view->height = $this->params->shift('height', '150');
        }

        return $this;
    }

    protected function applyGraphParams(GraphiteChart $chart)
    {
        $this->handleGraphParams();
        $view = $this->view;
        $chart->setStart($view->start)
              ->setWidth($view->width)
              ->setHeight($view->height)
              // TODO: handle before
              ->showLegend(! $this->params->get('hideLegend', false));

        return $chart;
    }

    protected function handleDatasourceToggles()
    {
        $this->handleTemplateParams();
        $disabled = $this->view->disabledDatasources;

        if ($disable = $this->params->get('disableDatasource')) {
            $url = $this->getRequest()->getUrl()->without('disableDatasource');
            if (! in_array($disable, $disabled)) {
                $url->getParams()->add('disabled', $disable);

            }
            $this->redirectNow($url);
        }

        if ($enable = $this->params->get('enableDatasource')) {
            $url = $this->getRequest()->getUrl()->without('enableDatasource')->without('disabled');
            $params = $url->getParams();
            foreach ($disabled as $key) {
                if ($key !== $enable) {
                    $params->add('disabled', $key);
                }
            }
            
            $this->redirectNow($url);
        }
    }
}