<?php
// Copyright 2004-present Facebook. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace Facebook\WebDriver\Remote;

use Facebook\WebDriver\Exception\WebDriverException;
use Facebook\WebDriver\Interactions\Internal\WebDriverCoordinates;
use Facebook\WebDriver\Internal\WebDriverLocatable;
use Facebook\WebDriver\WebDriverBy;
use Facebook\WebDriver\WebDriverDimension;
use Facebook\WebDriver\WebDriverElement;
use Facebook\WebDriver\WebDriverKeys;
use Facebook\WebDriver\WebDriverPoint;
use ZipArchive;

/**
 * Represents an HTML element.
 */
class RemoteWebElement implements WebDriverElement, WebDriverLocatable
{
    /**
     * @var RemoteExecuteMethod
     */
    protected $executor;
    /**
     * @var string
     */
    protected $id;
    /**
     * @var UselessFileDetector
     */
    protected $fileDetector;

    /**
     * @param RemoteExecuteMethod $executor
     * @param string $id
     */
    public function __construct(RemoteExecuteMethod $executor, $id)
    {
        $this->executor = $executor;
        $this->id = $id;
        $this->fileDetector = new UselessFileDetector();
    }

    /**
     * If this element is a TEXTAREA or text INPUT element, this will clear the value.
     *
     * @return RemoteWebElement The current instance.
     */
    public function clear()
    {
        $this->executor->execute(
            DriverCommand::CLEAR_ELEMENT,
            [':id' => $this->id]
        );

        return $this;
    }

    /**
     * Click this element.
     *
     * @return RemoteWebElement The current instance.
     */
    public function click()
    {
        $this->executor->execute(
            DriverCommand::CLICK_ELEMENT,
            [':id' => $this->id]
        );

        return $this;
    }

    /**
     * Find the first WebDriverElement within this element using the given mechanism.
     *
     * @param WebDriverBy $by
     * @return RemoteWebElement NoSuchElementException is thrown in
     *    HttpCommandExecutor if no element is found.
     * @see WebDriverBy
     */
    public function findElement(WebDriverBy $by)
    {
        $params = [
            'using' => $by->getMechanism(),
            'value' => $by->getValue(),
            ':id' => $this->id,
        ];
        $raw_element = $this->executor->execute(
            DriverCommand::FIND_CHILD_ELEMENT,
            $params
        );

        return $this->newElement($raw_element['ELEMENT']);
    }

    /**
     * Find all WebDriverElements within this element using the given mechanism.
     *
     * @param WebDriverBy $by
     * @return RemoteWebElement[] A list of all WebDriverElements, or an empty
     *    array if nothing matches
     * @see WebDriverBy
     */
    public function findElements(WebDriverBy $by)
    {
        $params = [
            'using' => $by->getMechanism(),
            'value' => $by->getValue(),
            ':id' => $this->id,
        ];
        $raw_elements = $this->executor->execute(
            DriverCommand::FIND_CHILD_ELEMENTS,
            $params
        );

        $elements = [];
        foreach ($raw_elements as $raw_element) {
            $elements[] = $this->newElement($raw_element['ELEMENT']);
        }

        return $elements;
    }

    /**
     * Get the value of a the given attribute of the element.
     *
     * @param string $attribute_name The name of the attribute.
     * @return string|null The value of the attribute.
     */
    public function getAttribute($attribute_name)
    {
        $params = [
            ':name' => $attribute_name,
            ':id' => $this->id,
        ];

        return $this->executor->execute(
            DriverCommand::GET_ELEMENT_ATTRIBUTE,
            $params
        );
    }

    /**
     * Get the value of a given CSS property.
     *
     * @param string $css_property_name The name of the CSS property.
     * @return string The value of the CSS property.
     */
    public function getCSSValue($css_property_name)
    {
        $params = [
            ':propertyName' => $css_property_name,
            ':id' => $this->id,
        ];

        return $this->executor->execute(
            DriverCommand::GET_ELEMENT_VALUE_OF_CSS_PROPERTY,
            $params
        );
    }

    /**
     * Get the location of element relative to the top-left corner of the page.
     *
     * @return WebDriverPoint The location of the element.
     */
    public function getLocation()
    {
        $location = $this->executor->execute(
            DriverCommand::GET_ELEMENT_LOCATION,
            [':id' => $this->id]
        );

        return new WebDriverPoint($location['x'], $location['y']);
    }

    /**
     * Try scrolling the element into the view port and return the location of
     * element relative to the top-left corner of the page afterwards.
     *
     * @return WebDriverPoint The location of the element.
     */
    public function getLocationOnScreenOnceScrolledIntoView()
    {
        $location = $this->executor->execute(
            DriverCommand::GET_ELEMENT_LOCATION_ONCE_SCROLLED_INTO_VIEW,
            [':id' => $this->id]
        );

        return new WebDriverPoint($location['x'], $location['y']);
    }

    /**
     * @return WebDriverCoordinates
     */
    public function getCoordinates()
    {
        $element = $this;

        $on_screen = null; // planned but not yet implemented
        $in_view_port = function () use ($element) {
            return $element->getLocationOnScreenOnceScrolledIntoView();
        };
        $on_page = function () use ($element) {
            return $element->getLocation();
        };
        $auxiliary = $this->getID();

        return new WebDriverCoordinates(
            $on_screen,
            $in_view_port,
            $on_page,
            $auxiliary
        );
    }

    /**
     * Get the size of element.
     *
     * @return WebDriverDimension The dimension of the element.
     */
    public function getSize()
    {
        $size = $this->executor->execute(
            DriverCommand::GET_ELEMENT_SIZE,
            [':id' => $this->id]
        );

        return new WebDriverDimension($size['width'], $size['height']);
    }

    /**
     * Get the tag name of this element.
     *
     * @return string The tag name.
     */
    public function getTagName()
    {
        // Force tag name to be lowercase as expected by protocol for Opera driver
        // until this issue is not resolved :
        // https://github.com/operasoftware/operadriver/issues/102
        // Remove it when fixed to be consistent with the protocol.
        return strtolower($this->executor->execute(
            DriverCommand::GET_ELEMENT_TAG_NAME,
            [':id' => $this->id]
        ));
    }

    /**
     * Get the visible (i.e. not hidden by CSS) innerText of this element,
     * including sub-elements, without any leading or trailing whitespace.
     *
     * @return string The visible innerText of this element.
     */
    public function getText()
    {
        return $this->executor->execute(
            DriverCommand::GET_ELEMENT_TEXT,
            [':id' => $this->id]
        );
    }

    /**
     * Is this element displayed or not? This method avoids the problem of having
     * to parse an element's "style" attribute.
     *
     * @return bool
     */
    public function isDisplayed()
    {
        return $this->executor->execute(
            DriverCommand::IS_ELEMENT_DISPLAYED,
            [':id' => $this->id]
        );
    }

    /**
     * Is the element currently enabled or not? This will generally return true
     * for everything but disabled input elements.
     *
     * @return bool
     */
    public function isEnabled()
    {
        return $this->executor->execute(
            DriverCommand::IS_ELEMENT_ENABLED,
            [':id' => $this->id]
        );
    }

    /**
     * Determine whether or not this element is selected or not.
     *
     * @return bool
     */
    public function isSelected()
    {
        return $this->executor->execute(
            DriverCommand::IS_ELEMENT_SELECTED,
            [':id' => $this->id]
        );
    }

    /**
     * Simulate typing into an element, which may set its value.
     *
     * @param mixed $value The data to be typed.
     * @return RemoteWebElement The current instance.
     */
    public function sendKeys($value)
    {
        $local_file = $this->fileDetector->getLocalFile($value);
        if ($local_file === null) {
            $params = [
                'value' => WebDriverKeys::encode($value),
                ':id' => $this->id,
            ];
            $this->executor->execute(DriverCommand::SEND_KEYS_TO_ELEMENT, $params);
        } else {
            $remote_path = $this->upload($local_file);
            $params = [
                'value' => WebDriverKeys::encode($remote_path),
                ':id' => $this->id,
            ];
            $this->executor->execute(DriverCommand::SEND_KEYS_TO_ELEMENT, $params);
        }

        return $this;
    }

    /**
     * Upload a local file to the server
     *
     * @param string $local_file
     *
     * @throws WebDriverException
     * @return string The remote path of the file.
     */
    private function upload($local_file)
    {
        if (!is_file($local_file)) {
            throw new WebDriverException('You may only upload files: ' . $local_file);
        }

        // Create a temporary file in the system temp directory.
        $temp_zip = tempnam(sys_get_temp_dir(), 'WebDriverZip');
        $zip = new ZipArchive();
        if ($zip->open($temp_zip, ZipArchive::CREATE) !== true) {
            return false;
        }
        $info = pathinfo($local_file);
        $file_name = $info['basename'];
        $zip->addFile($local_file, $file_name);
        $zip->close();
        $params = [
            'file' => base64_encode(file_get_contents($temp_zip)),
        ];
        $remote_path = $this->executor->execute(
            DriverCommand::UPLOAD_FILE,
            $params
        );
        unlink($temp_zip);

        return $remote_path;
    }

    /**
     * Set the fileDetector in order to let the RemoteWebElement to know that
     * you are going to upload a file.
     *
     * Basically, if you want WebDriver trying to send a file, set the fileDetector
     * to be LocalFileDetector. Otherwise, keep it UselessFileDetector.
     *
     *   eg. $element->setFileDetector(new LocalFileDetector);
     *
     * @param FileDetector $detector
     * @return RemoteWebElement
     * @see FileDetector
     * @see LocalFileDetector
     * @see UselessFileDetector
     */
    public function setFileDetector(FileDetector $detector)
    {
        $this->fileDetector = $detector;

        return $this;
    }

    /**
     * If this current element is a form, or an element within a form, then this will be submitted to the remote server.
     *
     * @return RemoteWebElement The current instance.
     */
    public function submit()
    {
        $this->executor->execute(
            DriverCommand::SUBMIT_ELEMENT,
            [':id' => $this->id]
        );

        return $this;
    }

    /**
     * Get the opaque ID of the element.
     *
     * @return string The opaque ID.
     */
    public function getID()
    {
        return $this->id;
    }

    /**
     * Test if two element IDs refer to the same DOM element.
     *
     * @param WebDriverElement $other
     * @return bool
     */
    public function equals(WebDriverElement $other)
    {
        return $this->executor->execute(DriverCommand::ELEMENT_EQUALS, [
            ':id' => $this->id,
            ':other' => $other->getID(),
        ]);
    }

    /**
     * Return the WebDriverElement with $id
     *
     * @param string $id
     *
     * @return RemoteWebElement
     */
    protected function newElement($id)
    {
        return new static($this->executor, $id);
    }
}