<?php

namespace App\Model\Table;

require_once APP . DS . 'Utility/Utils.php';
use App\Model\Table\AppTable;
use function App\Utility\Utils\array_diff_recursive;
use Cake\ORM\Table;
use Cake\Validation\Validator;
use Cake\Core\Configure;
use Cake\Utility\Inflector;
use Cake\Utility\Hash;
use Cake\I18n\FrozenTime;
use Cake\Http\Client;
use Cake\Http\Client\Response;
use Cake\Http\Exception\NotFoundException;
use Cake\Http\Client\Exception\NetworkException;
use Cake\ORM\TableRegistry;
use Cake\Error\Debugger;

class BroodsTable extends AppTable
{

    public $previewScopes = [
        'organisations' => [
            'quickFilterFields' => ['uuid', ['name' => true],],
            'contain' => ['MetaFields' => ['MetaTemplateNameDirectory'], 'Tags'],
            'compareFields' => ['name', 'url', 'nationality', 'sector', 'type', 'contacts', 'modified', 'tags', 'meta_fields',],
        ],
        'individuals' => [
            'quickFilterFields' => ['uuid', ['email' => true], ['first_name' => true], ['last_name' => true],],
            'contain' => ['MetaFields'],
            'compareFields' => ['email', 'first_name', 'last_name', 'position', 'modified', 'meta_fields', 'tags',],
        ],
        'sharingGroups' => [
            'quickFilterFields' => ['uuid', ['name' => true],],
            'contain' => ['SharingGroupOrgs', 'Organisations'],
            'compareFields' => ['name', 'releasability', 'description', 'organisation_id', 'user_id', 'active', 'local', 'modified', 'organisation', 'sharing_group_orgs',],
        ],
    ];

    private $metaFieldCompareFields = ['modified', 'value'];

    public function initialize(array $config): void
    {
        parent::initialize($config);
        $this->addBehavior('UUID');
        $this->addBehavior('Timestamp');
        $this->addBehavior('AuditLog');
        $this->BelongsTo(
            'Organisations'
        );
        $this->setDisplayField('name');
    }

    public function validationDefault(Validator $validator): Validator
    {
        return $validator
            ->requirePresence(['name', 'url', 'organisation_id'], 'create')
            ->notEmptyString('name')
            ->notEmptyString('url')
            ->add('url', 'isValidUrl', [
                'rule' => 'isValidUrl',
                'message' => __('The provided value is not a valid URL'),
                'provider' => 'table'
            ])
            ->naturalNumber('organisation_id', false);
    }

    public function genHTTPClient(Object $brood, array $options=[]): Object
    {
        $defaultOptions = [
            'headers' => [
                'Authorization' => $brood->authkey,
            ],
        ];
        if (empty($options['type'])) {
            $options['type'] = 'json';
        }
        $options = array_merge($defaultOptions, $options);
        $http = new Client($options);
        return $http;
    }

    public function HTTPClientGET(String $relativeURL, Object $brood, array $data=[], array $options=[]): Object
    {
        $http = $this->genHTTPClient($brood, $options);
        $url = sprintf('%s%s', $brood->url, $relativeURL);
        return $http->get($url, $data, $options);
    }

    public function HTTPClientPOST(String $relativeURL, Object $brood, $data, array $options=[]): Object
    {
        $http = $this->genHTTPClient($brood, $options);
        $url = sprintf('%s%s', $brood->url, $relativeURL);
        return $http->post($url, $data, $options);
    }

    public function queryStatus($id)
    {
        $brood = $this->find()->where(['id' => $id])->first();
        $start = microtime(true);
        try {
            $response = $this->HTTPClientGET('/instance/status.json', $brood);
        } catch (NetworkException $e) {
            return [
                'error' => __('Could not query status'),
                'reason' => $e->getMessage(),
            ];
        }
        $ping = ((int)(100 * (microtime(true) - $start)));
        $errors = [
            403 => [
                'error' => __('Authentication failure'),
                'reason' => __('Invalid user credentials.')
            ],
            404 => [
                'error' => __('Not found'),
                'reason' => __('Incorrect URL or proxy error')
            ],
            405 => [
                'error' => __('Insufficient privileges'),
                'reason' => __('The remote user account doesn\'t have the required privileges to synchronise.')
            ],
            500 => [
                'error' => __('Internal error'),
                'reason' => __('Something is probably broken on the remote side. Get in touch with the instance owner.')
            ]
        ];
        $result = [
            'code' => $response->getStatusCode()
        ];
        if ($response->isOk()) {
            $raw = $response->getJson();
            $result['response']['role'] = $raw['user']['role'];
            $result['response']['user'] = $raw['user']['username'];
            $result['response']['application'] = $raw['application'];
            $result['response']['version'] = $raw['version'];
            $result['ping'] = $ping;
        } else {
            $result['error'] = $errors[$result['code']]['error'];
            $result['reason'] = $errors[$result['code']]['reason'];
            $result['ping'] = $ping;
        }
        return $result;
    }

    public function queryIndex($id, $scope, $filter, $full = false)
    {
        $brood = $this->find()->where(['id' => $id])->first();
        if (empty($brood)) {
            throw new NotFoundException(__('Brood not found'));
        }
        if (!empty($full)) {
            $filter['full'] = 1;
        }
        $response = $this->HTTPClientGET(sprintf('/%s/index.json?%s', $scope, http_build_query($filter)), $brood);
        if ($response->isOk()) {
            return $response->getJson();
        } else {
            return false;
        }
    }

    // TODO: Delete this function?
    public function downloadAndCapture($brood_id, $object_id, $scope, $path)
    {
        $query = $this->find();
        $brood = $query->where(['id' => $brood_id])->first();
        if (empty($brood)) {
            throw new NotFoundException(__('Brood not found'));
        }
        $response = $this->HTTPClientGET(sprintf('/%s/view/%s.json', $scope, $org_id), $brood);
        if ($response->isOk()) {
            $org = $response->getJson();
            $this->Organisation = TableRegistry::getTableLocator()->get('Organisations');
            $result = $this->Organisation->captureOrg($org);
            return $result;
        } else {
            return false;
        }
    }

    public function downloadOrg($brood_id, $org_id)
    {
        $query = $this->find();
        $brood = $query->where(['id' => $brood_id])->first();
        if (empty($brood)) {
            throw new NotFoundException(__('Brood not found'));
        }
        $response = $this->HTTPClientGET(sprintf('/organisations/view/%s.json', $org_id), $brood);
        if ($response->isOk()) {
            $org = $response->getJson();
            $this->Organisation = TableRegistry::getTableLocator()->get('Organisations');
            $result = $this->Organisation->captureOrg($org);
            return $result;
        } else {
            return false;
        }
    }

    public function downloadIndividual($brood_id, $individual_id)
    {
        $query = $this->find();
        $brood = $query->where(['id' => $brood_id])->first();
        if (empty($brood)) {
            throw new NotFoundException(__('Brood not found'));
        }
        $response = $this->HTTPClientGET(sprintf('/individuals/view/%s.json', $individual_id), $brood);
        if ($response->isOk()) {
            $individual = $response->getJson();
            $this->Individuals = TableRegistry::getTableLocator()->get('Individuals');
            $result = $this->Individuals->captureIndividual($individual);
            return $result;
        } else {
            return false;
        }
    }

    public function downloadSharingGroup($brood_id, $sg_id, $user_id)
    {
        $query = $this->find();
        $brood = $query->where(['id' => $brood_id])->first();
        if (empty($brood)) {
            throw new NotFoundException(__('Brood not found'));
        }
        $response = $this->HTTPClientGET(sprintf('/sharing-groups/view/%s.json', $sg_id), $brood);
        if ($response->isOk()) {
            $individual = $response->getJson();
            $this->SharingGroups = TableRegistry::getTableLocator()->get('SharingGroups');
            $result = $this->SharingGroups->captureSharingGroup($individual, $user_id);
            return $result;
        } else {
            return false;
        }
    }

    public function queryLocalTools($brood_id)
    {
        $query = $this->find();
        $brood = $query->where(['id' => $brood_id])->first();
        if (empty($brood)) {
            throw new NotFoundException(__('Brood not found'));
        }
        $response = $this->HTTPClientGET('/localTools/exposedTools', $brood);
        if ($response->isOk()) {
            return $response->getJson();
        } else {
            return false;
        }
    }

    public function sendRequest($brood, $urlPath, $methodPost = true, $data = []): Response
    {
        if ($methodPost) {
            $response = $this->HTTPClientPOST($urlPath, $brood, json_encode($data));
        } else {
            $response = $this->HTTPClientGET($urlPath, $brood, $data);
        }
        return $response;
    }

    private function injectRequiredData($params, $data): Array
    {
        $data['connectorName'] = $params['remote_tool']['connector'];
        $data['cerebrateURL'] = Configure::read('App.fullBaseUrl');
        $data['local_tool_id'] = $params['connection']['id'];
        $data['remote_tool_id'] = $params['remote_tool']['id'];
        $data['tool_name'] = $params['connection']['name'];
        return $data;
    }

    public function sendLocalToolConnectionRequest($params, $data): array
    {
        $url = '/inbox/createEntry/LocalTool/IncomingConnectionRequest';
        $data = $this->injectRequiredData($params, $data);
        try {
            $response = $this->sendRequest($params['remote_cerebrate'], $url, true, $data);
            $jsonReply = $response->getJson();
            if (empty($jsonReply['success'])) {
                $jsonReply = $this->handleMessageNotCreated($params['remote_cerebrate'], $url, $data, 'LocalTool', 'IncomingConnectionRequest', $response, $params, 'STATE_INITIAL');
            }
        } catch (NotFoundException $e) {
            $jsonReply = $this->handleSendingFailed($params['remote_cerebrate'], $url, $data, 'LocalTool', 'IncomingConnectionRequest', $e, $params, 'STATE_INITIAL');
        }
        return $jsonReply;
    }

    public function sendLocalToolAcceptedRequest($params, $data): array
    {
        $url = '/inbox/createEntry/LocalTool/AcceptedRequest';
        $data = $this->injectRequiredData($params, $data);
        try {
            $response = $this->sendRequest($params['remote_cerebrate'], $url, true, $data);
            $jsonReply = $response->getJson();
            if (empty($jsonReply['success'])) {
                $jsonReply = $this->handleMessageNotCreated($params['remote_cerebrate'], $url, $data, 'LocalTool', 'AcceptedRequest', $response, $params, 'STATE_CONNECTED');
            } else {
                $this->setRemoteToolConnectionStatus($params, 'STATE_CONNECTED');
            }
        } catch (NotFoundException $e) {
            $jsonReply = $this->handleSendingFailed($params['remote_cerebrate'], $url, $data, 'LocalTool', 'AcceptedRequest', $e, $params, 'STATE_CONNECTED');
        }
        return $jsonReply;
    }

    public function sendLocalToolDeclinedRequest($params, $data): array
    {
        $url = '/inbox/createEntry/LocalTool/DeclinedRequest';
        $data = $this->injectRequiredData($params, $data);
        try {
            $response = $this->sendRequest($params['remote_cerebrate'], $url, true, $data);
            $jsonReply = $response->getJson();
            if (empty($jsonReply['success'])) {
                $jsonReply = $this->handleMessageNotCreated($params['remote_cerebrate'], $url, $data, 'LocalTool', 'AcceptedRequest', $response, $params, 'STATE_DECLINED');
            }
        } catch (NotFoundException $e) {
            $jsonReply = $this->handleSendingFailed($params['remote_cerebrate'], $url, $data, 'LocalTool', 'AcceptedRequest', $e, $params, 'STATE_DECLINED');
        }
        return $jsonReply;
    }

    /**
     * handleSendingFailed - Handle the case if the request could not be sent or if the remote rejected the connection request
     *
     * @param  Object $response
     * @return array
     */
    private function handleSendingFailed($brood, $url, $data, $model, $action, $e, $params, $next_connector_state): array
    {
        $connector = $params['connector'][$params['remote_tool']['connector']];
        $reason = [
            'message' => __('Failed to send message to remote cerebrate. It has been placed in the outbox.'),
            'errors' => [$e->getMessage()],
        ];
        $outboxSaveResult = $this->saveErrorInOutbox($brood, $url, $data, $reasonMessage, $params, $next_connector_state);
        $connector->remoteToolConnectionStatus($params, $connector::STATE_SENDING_ERROR);
        $creationResult = [
            'success' => false,
            'message' => $reason['message'],
            'errors' => $reason['errors'],
            'placed_in_outbox' => !empty($outboxSaveResult['success']),
        ];
        return $creationResult;
    }

    /**
     * handleMessageNotCreated - Handle the case if the request was sent but the remote brood did not save the message in the inbox
     *
     * @param  Object $response
     * @return array
     */
    private function handleMessageNotCreated($brood, $url, $data, $model, $action, $response, $params, $next_connector_state): array
    {
        $connector = $params['connector'][$params['remote_tool']['connector']];
        $responseErrors = $response->getStringBody();
        if (!is_null($response->getJson())) {
            $responseErrors = $response->getJson()['errors'] ?? $response->getJson()['message'];
        }
        $reason = [
            'message' => __('Message rejected by the remote cerebrate. It has been placed in the outbox.'),
            'errors' => [$responseErrors],
        ];
        $outboxSaveResult = $this->saveErrorInOutbox($brood, $url, $data, $reason, $model, $action, $params, $next_connector_state);
        $connector->remoteToolConnectionStatus($params, $connector::STATE_SENDING_ERROR);
        $creationResult = [
            'success' => false,
            'message' => $reason['message'],
            'errors' => $reason['errors'],
            'placed_in_outbox' => !empty($outboxSaveResult['success']),
        ];
        return $creationResult;
    }

    private function saveErrorInOutbox($brood, $url, $data, $reason, $model, $action, $params, $next_connector_state): array
    {
        $this->OutboxProcessors = TableRegistry::getTableLocator()->get('OutboxProcessors');
        $processor = $this->OutboxProcessors->getProcessor('Broods', 'ResendFailedMessage');
        $entryData = [
            'data' => [
                'sent' => $data,
                'url' => $url,
                'brood_id' => $brood->id,
                'reason' => $reason,
                'local_tool_id' => $params['connection']['id'],
                'remote_tool' => $params['remote_tool'],
                'next_connector_state' => $next_connector_state,
            ],
            'brood' => $brood,
            'model' => $model,
            'action' => $action,
        ];
        $creationResult = $processor->create($entryData);
        return $creationResult;
    }

    private function setRemoteToolConnectionStatus($params, String $status): void
    {
        $connector = $params['connector'][$params['remote_tool']['connector']];
        $connector->remoteToolConnectionStatus($params, constant(get_class($connector) . '::' . $status));
    }

    public function attachAllSyncStatus(array $data, string $scope): array
    {
        $options = $this->previewScopes[$scope];
        foreach ($data as $i => $entry) {
            $data[$i] = $this->__attachSyncStatus($scope, $entry, $options);
        }
        return $data;
    }

    private function __attachSyncStatus(string $scope, array $entry, array $options = []): array
    {
        $table = TableRegistry::getTableLocator()->get(Inflector::camelize($scope));
        $localEntry = $table
            ->find()
            ->where(['uuid' => $entry['uuid']])
            ->first();
        if (is_null($localEntry)) {
            $entry['status'] = $this->__statusNotLocal();
        } else {
            if (!empty($options['contain'])) {
                $localEntry = $table->loadInto($localEntry, $options['contain']);
            }
            $localEntry = json_decode(json_encode($localEntry), true);
            $entry['status'] = $this->__statusLocal($entry, $localEntry, $options);
        }

        return $entry;
    }

    private function __statusNotLocal(): array
    {
        return self::__getStatus(false);
    }

    private function __statusLocal(array $remoteEntry, $localEntry, array $options = []): array
    {
        $isLocalNewer = (new FrozenTime($localEntry['modified']))->toUnixString() >= (new FrozenTime($remoteEntry['modified']))->toUnixString();
        $compareFields = $options['compareFields'];
        $fieldDifference = [];
        $fieldDifference = array_diff_recursive($remoteEntry, $localEntry);
        // if (in_array('meta_fields', $options['compareFields']) && !empty($fieldDifference['meta_fields'])) {
        //     $fieldDifference['meta_fields'] = $this->_compareMetaFields($remoteEntry, $localEntry, $options);
        // }
        $fieldDifference = array_filter($fieldDifference, function($value, $field) use ($compareFields) {
            return in_array($field, $compareFields);
        }, ARRAY_FILTER_USE_BOTH);
        foreach ($fieldDifference as $fieldName => $value) {
            $fieldDifference[$fieldName] = [
                'local' => $localEntry[$fieldName],
                'remote' => $value,
            ];
        }
        if (in_array('meta_fields', $options['compareFields']) && !empty($fieldDifference['meta_fields'])) {
            $fieldDifference['meta_fields'] = $this->_compareMetaFields($remoteEntry, $localEntry, $options);
        }

        return self::__getStatus(true, $isLocalNewer, $fieldDifference);
    }

    private static function __getStatus($local=true, $updateToDate=false, array $data = []): array
    {
        $status = [
            'local' => $local,
            'up_to_date' => $updateToDate,
            'data' => $data,
        ];
        if ($status['local'] && $status['up_to_date']) {
            $status['title'] = __('This entity is up-to-date');
        } else if ($status['local'] && !$status['up_to_date']) {
            $status['title'] = __('This entity is known but differs with the remote');
        } else {
            $status['title'] = __('This entity is not known locally');
        }
        return $status;
    }

    private function _compareMetaFields($remoteEntry, $localEntry): array
    {
        $compareFields = $this->metaFieldCompareFields;
        $indexedRemoteMF = [];
        $indexedLocalMF = [];
        foreach ($remoteEntry['meta_fields'] as $metafields) {
            $indexedRemoteMF[$metafields['uuid']] = array_intersect_key($metafields, array_flip($compareFields));
        }
        foreach ($localEntry['meta_fields'] as $metafields) {
            $indexedLocalMF[$metafields['uuid']] = array_intersect_key($metafields, array_flip($compareFields));
        }
        $fieldDifference = [];
        foreach ($remoteEntry['meta_fields'] as $remoteMetafield) {
            $uuid = $remoteMetafield['uuid'];
            $metafieldName = $remoteMetafield['field'];
            // $metafieldName = sprintf('%s(v%s) :: %s', $remoteMetafield['template_name'], $remoteMetafield['template_version'], $remoteMetafield['field']);
            if (empty($fieldDifference[$metafieldName])) {
                $fieldDifference[$metafieldName] = [
                    'meta_template' => [
                        'name' => $remoteMetafield['template_name'],
                        'version' => $remoteMetafield['template_version'],
                        'uuid' => $remoteMetafield['template_uuid']
                    ],
                    'delta' => [],
                ];
            }
            if (empty($indexedLocalMF[$uuid])) {
                $fieldDifference[$metafieldName]['delta'][] = [
                    'local' => null,
                    'remote' => $indexedRemoteMF[$uuid],
                ];
            } else {
                $fieldDifferenceTmp = array_diff_recursive($indexedRemoteMF[$uuid], $indexedLocalMF[$uuid]);
                if (!empty($fieldDifferenceTmp)) {
                    $fieldDifference[$metafieldName]['delta'][] = [
                        'local' => $indexedLocalMF[$uuid],
                        'remote' => $indexedRemoteMF[$uuid],
                    ];
                }
            }
        }
        return $fieldDifference;
    }
}