<?php

namespace humhub\modules\animal_management\models\forms;

use humhub\modules\animal_management\models\Animal;
use humhub\modules\animal_management\models\AnimalTransfer;
use humhub\modules\animal_management\models\AnimalTransferEvent;
use humhub\modules\animal_management\notifications\TransferNotifier;
use humhub\modules\animal_management\notifications\TransferRequestedNotification;
use humhub\modules\space\models\Space;
use Yii;
use yii\base\Model;

class TransferRequestForm extends Model
{
    public Animal $animal;
    public Space $sourceSpace;

    public int $to_space_id = 0;
    public string $request_message = '';
    public string $conditions_text = '';

    private ?AnimalTransfer $transfer = null;

    public function rules()
    {
        return [
            [['to_space_id'], 'required'],
            [['to_space_id'], 'integer'],
            [['request_message', 'conditions_text'], 'string'],
            [['to_space_id'], 'validateTargetSpace'],
        ];
    }

    public function validateTargetSpace($attribute): void
    {
        if ($this->hasErrors()) {
            return;
        }

        if ($this->to_space_id === (int)$this->sourceSpace->id) {
            $this->addError($attribute, Yii::t('AnimalManagementModule.base', 'You must choose a different destination rescue.'));
            return;
        }

        $target = Space::findOne(['id' => $this->to_space_id, 'status' => Space::STATUS_ENABLED]);
        if (!$target instanceof Space) {
            $this->addError($attribute, Yii::t('AnimalManagementModule.base', 'Selected destination rescue was not found.'));
        }
    }

    public function getTargetOptions(): array
    {
        return Space::find()
            ->select(['name', 'id'])
            ->where(['status' => Space::STATUS_ENABLED])
            ->andWhere(['!=', 'id', (int)$this->sourceSpace->id])
            ->orderBy(['name' => SORT_ASC])
            ->indexBy('id')
            ->column();
    }

    public function save(): bool
    {
        if (!$this->validate()) {
            return false;
        }

        $targetSpace = Space::findOne(['id' => $this->to_space_id, 'status' => Space::STATUS_ENABLED]);
        if (!$targetSpace instanceof Space) {
            $this->addError('to_space_id', Yii::t('AnimalManagementModule.base', 'Selected destination rescue was not found.'));
            return false;
        }

        $transaction = Yii::$app->db->beginTransaction();

        try {
            $transfer = new AnimalTransfer();
            $transfer->animal_id = (int)$this->animal->id;
            $transfer->from_contentcontainer_id = (int)$this->sourceSpace->contentcontainer_id;
            $transfer->to_contentcontainer_id = (int)$targetSpace->contentcontainer_id;
            $transfer->requested_by = Yii::$app->user->isGuest ? null : (int)Yii::$app->user->id;
            $transfer->status = AnimalTransfer::STATUS_REQUESTED;
            $transfer->request_message = trim($this->request_message);
            $transfer->conditions_text = trim($this->conditions_text);

            if (!$transfer->save()) {
                $this->addErrors($transfer->getErrors());
                $transaction->rollBack();
                return false;
            }

            $this->animal->status = Animal::STATUS_TRANSFER_PENDING;
            if (!$this->animal->save(false, ['status', 'updated_at'])) {
                $transaction->rollBack();
                $this->addError('to_space_id', Yii::t('AnimalManagementModule.base', 'Could not update animal transfer status.'));
                return false;
            }

            $auditSaved = AnimalTransferEvent::log(
                $transfer,
                AnimalTransferEvent::EVENT_REQUESTED,
                null,
                AnimalTransfer::STATUS_REQUESTED,
                Yii::t('AnimalManagementModule.base', 'Transfer requested from {from} to {to}.', [
                    '{from}' => (string)$this->sourceSpace->name,
                    '{to}' => (string)$targetSpace->name,
                ]),
                [
                    'from_space_id' => (int)$this->sourceSpace->id,
                    'to_space_id' => (int)$targetSpace->id,
                ]
            );

            if (!$auditSaved) {
                $transaction->rollBack();
                $this->addError('to_space_id', Yii::t('AnimalManagementModule.base', 'Could not write transfer audit log.'));
                return false;
            }

            $transaction->commit();
        } catch (\Throwable $e) {
            $transaction->rollBack();
            Yii::error($e, 'animal_management.transfer_request');
            $this->addError('to_space_id', Yii::t('AnimalManagementModule.base', 'Could not create transfer request.'));
            return false;
        }

        $this->transfer = $transfer;
        $this->notifyTargetManagers();
        return true;
    }

    private function notifyTargetManagers(): void
    {
        $targetSpace = Space::findOne(['id' => $this->to_space_id]);
        if (!$targetSpace instanceof Space) {
            return;
        }

        $recipients = TransferNotifier::privilegedUsersForSpace($targetSpace);

        $originator = Yii::$app->user->isGuest ? null : Yii::$app->user->getIdentity();

        foreach ($recipients as $recipient) {
            if ($originator instanceof \humhub\modules\user\models\User && (int)$recipient->id === (int)$originator->id) {
                continue;
            }

            $notification = TransferRequestedNotification::instance();
            if ($originator) {
                $notification->from($originator);
            }
            $notification->animalName = $this->animal->getDisplayName();
            $notification->fromSpaceName = (string)$this->sourceSpace->name;
            $notification->toSpaceGuid = (string)$targetSpace->guid;
            $notification->payload([
                'animalName' => $notification->animalName,
                'fromSpaceName' => $notification->fromSpaceName,
                'toSpaceGuid' => $notification->toSpaceGuid,
            ]);
            $notification->send($recipient);
        }
    }
}