<?php

declare(strict_types=1);

namespace PhpSchool\CliMenu\Input;

use PhpSchool\CliMenu\CliMenu;

use PhpSchool\CliMenu\Util\StringUtil;

use PhpSchool\Terminal\InputCharacter;

use PhpSchool\Terminal\NonCanonicalReader;

use PhpSchool\Terminal\Terminal;

/**

* @author Aydin Hassan <[email protected]>

*/

class InputIO

{

/**

* @var CliMenu

*/

private $parentMenu;

/**

* @var Terminal

*/

private $terminal;

/**

* @var callable[][]

*/

private $callbacks = [];

public function __construct(CliMenu $parentMenu, Terminal $terminal)

{

$this->terminal = $terminal;

$this->parentMenu = $parentMenu;

}

public function collect(Input $input) : InputResult

{

$this->drawInput($input, $input->getPlaceholderText());

$inputValue = $input->getPlaceholderText();

$havePlaceHolderValue = !empty($inputValue);

$originalValue = $inputValue;

$reader = new NonCanonicalReader($this->terminal);

while ($char = $reader->readCharacter()) {

if ($char->isNotControl()) {

if ($havePlaceHolderValue) {

$inputValue = $char->get();

$havePlaceHolderValue = false;

} else {

$inputValue .= $char->get();

}

$this->parentMenu->redraw();

$this->drawInput($input, $inputValue);

continue;

}

if ($char->isHandledControl()) {

switch ($char->getControl()) {

case InputCharacter::ESC:

$this->parentMenu->redraw();

return new InputResult($originalValue);

case InputCharacter::ENTER:

if ($input->validate($inputValue)) {

$this->parentMenu->redraw();

return new InputResult($inputValue);

} else {

$this->drawInputWithError($input, $inputValue);

continue 2;

}

case InputCharacter::BACKSPACE:

if (!empty($inputValue)) {

$inputValue = mb_substr($inputValue, 0, -1);

$this->parentMenu->redraw();

$this->drawInput($input, $inputValue);

}

continue 2;

}

if (!empty($this->callbacks[$char->getControl()])) {

foreach ($this->callbacks[$char->getControl()] as $callback) {

$inputValue = $callback($inputValue);

$this->drawInput($input, $inputValue);

}

}

}

}

}

public function registerControlCallback(string $control, callable $callback) : void

{

if (!isset($this->callbacks[$control])) {

$this->callbacks[$control] = [];

}

$this->callbacks[$control][] = $callback;

}

private function getInputWidth(array $lines) : int

{

return max(

array_map(

function (string $line) {

return mb_strwidth($line);

},

$lines

)

) ? : 0;

}

private function calculateYPosition() : int

{

$lines = 5; //1. empty 2. prompt text 3. empty 4. input 5. empty

return (int) (ceil($this->parentMenu->getCurrentFrame()->count() / 2) - ceil($lines /2) + 1);

}

private function calculateYPositionWithError() : int

{

$lines = 7; //1. empty 2. prompt text 3. empty 4. input 5. empty 6. error 7. empty

return (int) (ceil($this->parentMenu->getCurrentFrame()->count() / 2) - ceil($lines /2) + 1);

}

private function calculateXPosition(Input $input, string $userInput) : int

{

$width = $this->getInputWidth(

[

$input->getPromptText(),

$input->getValidationFailedText(),

$userInput

]

);

$parentStyle = $this->parentMenu->getStyle();

$halfWidth = ($width + ($input->getStyle()->getPaddingLeftRight() * 2)) / 2;

$parentHalfWidth = ceil($parentStyle->getWidth() / 2 + $parentStyle->getMargin());

return (int) ($parentHalfWidth - $halfWidth);

}

private function drawLine(Input $input, string $userInput, string $text) : void

{

$this->terminal->moveCursorToColumn($this->calculateXPosition($input, $userInput));

$line = sprintf(

"%s%s%s%s%s\n",

$input->getStyle()->getColoursSetCode(),

str_repeat(' ', $input->getStyle()->getPaddingLeftRight()),

$text,

str_repeat(' ', $input->getStyle()->getPaddingLeftRight()),

$input->getStyle()->getColoursResetCode()

);

$this->terminal->write($line);

}

private function drawCenteredLine(Input $input, string $userInput, string $text) : void

{

$width = $this->getInputWidth(

[

$input->getPromptText(),

$input->getValidationFailedText(),

$userInput

]

);

$textLength = mb_strwidth(StringUtil::stripAnsiEscapeSequence($text));

$leftFill = (int) (($width / 2) - ($textLength / 2));

$rightFill = (int) ceil($width - $leftFill - $textLength);

$this->drawLine(

$input,

$userInput,

sprintf(

'%s%s%s',

str_repeat(' ', $leftFill),

$text,

str_repeat(' ', $rightFill)

)

);

}

private function drawEmptyLine(Input $input, string $userInput) : void

{

$width = $this->getInputWidth(

[

$input->getPromptText(),

$input->getValidationFailedText(),

$userInput

]

);

$this->drawLine(

$input,

$userInput,

str_repeat(' ', $width)

);

}

private function drawInput(Input $input, string $userInput) : void

{

$this->terminal->moveCursorToRow($this->calculateYPosition());

$this->drawEmptyLine($input, $userInput);

$this->drawTitle($input, $userInput);

$this->drawEmptyLine($input, $userInput);

$this->drawInputField($input, $input->filter($userInput));

$this->drawEmptyLine($input, $userInput);

}

private function drawInputWithError(Input $input, string $userInput) : void

{

$this->terminal->moveCursorToRow($this->calculateYPositionWithError());

$this->drawEmptyLine($input, $userInput);

$this->drawTitle($input, $userInput);

$this->drawEmptyLine($input, $userInput);

$this->drawInputField($input, $input->filter($userInput));

$this->drawEmptyLine($input, $userInput);

$this->drawCenteredLine(

$input,

$userInput,

$input->getValidationFailedText()

);

$this->drawEmptyLine($input, $userInput);

}

private function drawTitle(Input $input, string $userInput) : void

{

$this->drawCenteredLine(

$input,

$userInput,

$input->getPromptText()

);

}

private function drawInputField(Input $input, string $userInput) : void

{

$this->drawCenteredLine(

$input,

$userInput,

sprintf(

'%s%s%s',

$input->getStyle()->getInvertedColoursSetCode(),

$userInput,

$input->getStyle()->getInvertedColoursUnsetCode()

)

);

}

}