<?php
/*
 * @copyright   Copyright (C) 2010-2025 Combodo SARL
 * @license     http://opensource.org/licenses/AGPL-3.0
 */

namespace Combodo\iTop\Forms\Block;

use Combodo\iTop\Forms\Block\Base\FormBlock;
use Combodo\iTop\Forms\Block\IO\AbstractFormIO;
use Combodo\iTop\Forms\Block\IO\Converter\AbstractConverter;
use Combodo\iTop\Forms\Block\IO\Format\RawFormat;
use Combodo\iTop\Forms\Block\IO\FormInput;
use Combodo\iTop\Forms\Block\IO\FormOutput;
use Combodo\iTop\Forms\IFormBlock;
use Forms\BlockIO;

/**
 * Abstract form block.
 *
 * Inputs / Outputs.
 * Options.
 *
 */
abstract class AbstractFormBlock implements IFormBlock
{
	// Outputs
	public const OUTPUT_VALUE = 'value';

	/** @var null|FormBlock */
	private ?FormBlock $oParent = null;

	/** @var array form options */
	private array $aOptions = [];

	/** @var array form dynamic options */
	protected array $aDynamicOptions = [];

	/** @var array form block inputs */
	private array $aFormInputs = [];

	/** @var array form block outputs */
	private array $aFormOutputs = [];

	/** @var bool flag indicating the form insertion */
	private bool $bIsAddedToForm = false;

	/**
	 * Constructor.
	 *
	 * @param string $sName
	 * @param array $aUserOptions
	 */
	public function __construct(private readonly string $sName, protected array $aUserOptions = [])
	{
		// Compute options
		$this->aOptions = $aUserOptions;
		$this->InitBlockOptions($this->aOptions);

		// Initialize block inputs
		$this->InitInputs();

		// Initialize block outputs
		$this->InitOutputs();
	}

	/**
	 * Initialize options.
	 *
	 * @param array $aUserOptions
	 *
	 */
	public function InitBlockOptions(array &$aUserOptions): void
	{
		$aUserOptions['form_block'] = $this;
	}

	/**
	 * Set the parent block.
	 *
	 * @param FormBlock $oParent
	 *
	 * @return void
	 */
	public function SetParent(FormBlock $oParent): void
	{
		$this->oParent = $oParent;
	}

	/**
	 * Get the parent block.
	 *
	 * @return FormBlock|null
	 */
	public function GetParent(): ?FormBlock
	{
		return $this->oParent;
	}

	/**
	 * Return true if this block is root.
	 *
	 * @return bool
	 */
	public function IsRootBlock(): bool
	{
		return $this->oParent !== null;
	}

	/**
	 * Return the form block name.
	 *
	 * @return string
	 */
	public function GetName(): string
	{
		return $this->sName;
	}

	/**
	 * Return the form block options.
	 * Options will be passed to FormType for building.
	 *
	 * @return array
	 */
	public function GetOptions(): array
	{
		return $this->aOptions;
	}

	public function GetOptionsMergedWithDynamic(string $sEventType = null): array
	{
		return array_merge($this->GetDynamicOptions(), $this->GetOptions());
	}

	public function GetDynamicOptions(string $sEventType = null): array
	{
		return $this->aDynamicOptions;
	}

	/**
	 * @param string|null $sEventType
	 *
	 * @return void
	 */
	public function UpdateDynamicOptions(string $sEventType = null): void
	{
		$this->aDynamicOptions = [];
	}

	/**
	 * Add an input.
	 *
	 * @param string $sName the input name
	 * @param string $sType the type of the input
	 *
	 * @return AbstractFormBlock
	 */
	public function AddInput(string $sName, string $sType): AbstractFormBlock
	{
		$oFormInput = new FormInput($sName, $sType, $this);
		$this->aFormInputs[$oFormInput->GetName()] = $oFormInput;

		return $this;
	}

	/**
	 * Add an input connected to another block.
	 *
	 * @param string $sName the input name
	 * @param string $sOutputBlockName
	 * @param string $sOutputName
	 *
	 * @return AbstractFormBlock
	 * @throws FormBlockException
	 */
	public function AddInputDependsOn(string $sName, string $sOutputBlockName, string $sOutputName): AbstractFormBlock
	{
		$oOutputBlock = $this->GetParent()->Get($sOutputBlockName);
		$oBlockOutput = $oOutputBlock->GetOutput($sOutputName);

		$this->AddInput($sName, $oBlockOutput->GetDataType());
		$this->DependsOn($sName, $sOutputBlockName, $sOutputName);

		return $this;
	}

	/**
	 * Get an input.
	 *
	 * @param string $sName
	 *
	 * @return FormInput
	 * @throws FormBlockException
	 */
	public function GetInput(string $sName): FormInput
	{
		if (!array_key_exists($sName, $this->aFormInputs)) {
			throw new FormBlockException('Missing input '.$sName.' for '.$this->sName);
		}

		return $this->aFormInputs[$sName];
	}

	/**
	 * Add an output.
	 *
	 * @param string $sName
	 * @param string $sType
	 * @param AbstractConverter|null $oConverter
	 *
	 * @return AbstractFormBlock
	 */
	public function AddOutput(string $sName, string $sType, AbstractConverter $oConverter = null): AbstractFormBlock
	{
		$oFormOutput = new FormOutput($sName, $sType, $this, $oConverter);
		$this->aFormOutputs[$oFormOutput->GetName()] = $oFormOutput;

		return $this;
	}

	/**
	 * Get an output.
	 *
	 * @param string $sName output name
	 *
	 * @return FormOutput
	 * @throws FormBlockException
	 */
	public function GetOutput(string $sName): FormOutput
	{
		if (!array_key_exists($sName, $this->aFormOutputs)) {
			throw new FormBlockException('Missing output '.$sName.' for '.$this->sName);
		}

		return $this->aFormOutputs[$sName];
	}

	/**
	 * Return the inputs.
	 *
	 * @return array
	 */
	public function GetInputs(): array
	{
		return $this->aFormInputs;
	}

	/**
	 * Return the outputs.
	 *
	 * @return array
	 */
	public function GetOutputs(): array
	{
		return $this->aFormOutputs;
	}

	/**
	 * Attach an input to a block output.
	 *
	 * @param string $sInputName the input name
	 * @param string $sOutputBlockName the dependency block name
	 * @param string $sOutputName the dependency output name
	 *
	 * @return $this
	 * @throws FormBlockException
	 */
	public function DependsOn(string $sInputName, string $sOutputBlockName, string $sOutputName): AbstractFormBlock
	{

		$oOutputBlock = $this->GetParent()->Get($sOutputBlockName);
		$oFormInput = $this->GetInput($sInputName);
		$oFormOutput = $oOutputBlock->GetOutput($sOutputName);
		$oFormOutput->BindToInput($oFormInput);

		return $this;
	}

	/**
	 * Attach an input to a parent block input.
	 *
	 * @param string $sInputName input name
	 * @param string $sParentInputName parent input name
	 *
	 * @return $this
	 * @throws FormBlockException
	 */
	public function DependsOnParent(string $sInputName, string $sParentInputName): AbstractFormBlock
	{
		$oFormInput = $this->GetInput($sInputName);
		$oParentFormInput = $this->GetParent()->GetInput($sParentInputName);
		$oParentFormInput->BindToInput($oFormInput);

		return $this;
	}

	/**
	 * Attach an output to a parent block output.
	 *
	 * @param string $sOutputName output name
	 * @param string $sParentOutputName parent output name
	 *
	 * @return $this
	 * @throws FormBlockException
	 */
	public function ImpactParent(string $sOutputName, string $sParentOutputName): AbstractFormBlock
	{
		$oFormOutput = $this->GetOutput($sOutputName);
		$oParentFormOutput = $this->GetParent()->GetOutput($sParentOutputName);
		$oFormOutput->BindToOutput($oParentFormOutput);

		return $this;
	}

	/**
	 * Check existence of one or more dependencies.
	 *
	 * @return bool
	 */
	public function HasDependenciesBlocks(): bool
	{
		foreach ($this->aFormInputs as $oFormInput) {
			if ($oFormInput->IsBound()) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Check existence of one or more dependents blocks.
	 *
	 * @return bool
	 */
	public function ImpactDependentsBlocks(): bool
	{
		/** @var FormOutput $oFormOutput */
		foreach ($this->aFormOutputs as $oFormOutput) {
			if (count($oFormOutput->GetBindings()) > 0) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Get bound inputs bindings.
	 *
	 * @return array
	 */
	public function GetBoundInputsBindings(): array
	{
		$aBindings = [];

		/** @var FormInput $oFormInput */
		foreach ($this->aFormInputs as $oFormInput) {
			if ($oFormInput->IsBound()) {
				$aBindings[$oFormInput->GetName()] = $oFormInput->GetBinding();
			}
		}

		return $aBindings;
	}

	/**
	 * Get bound outputs bindings.
	 *
	 * @return array
	 */
	public function GetBoundOutputBindings(): array
	{
		$aBindings = [];

		/** @var FormInput $oFormInput */
		foreach ($this->aFormOutputs as $oFormOutput) {
			if ($oFormOutput->IsBound()) {
				$aBindings[$oFormOutput->GetName()] = $oFormOutput->GetBinding();
			}
		}

		return $aBindings;
	}

	/**
	 * The block has been added to its parent.
	 *
	 * @return bool
	 */
	public function IsAdded(): bool
	{
		return $this->bIsAddedToForm;
	}

	/**
	 * Indicate that the block has been added to its parent.
	 *
	 * @param bool $bIsAdded
	 *
	 * @return void
	 */
	public function SetAdded(bool $bIsAdded): void
	{
		$this->bIsAddedToForm = $bIsAdded;
	}

	/**
	 * Inputs data ready.
	 *
	 * @param string|null $sType
	 *
	 * @return bool
	 */
	public function IsInputsDataReady(string $sType = null): bool
	{
		foreach ($this->aFormInputs as $oFormInput) {
			if ($oFormInput->IsBound()) {
				if (!$oFormInput->IsEventDataReady($sType)) {
					return false;
				}
			}
		}

		return true;
	}

	/**
	 * Compute outputs values.
	 *
	 * @param string $sEventType
	 * @param mixed $oData
	 *
	 * @return void
	 */
	public function ComputeOutputs(string $sEventType, mixed $oData): void
	{
		/** Iterate throw output @var FormOutput $oFormOutput */
		foreach ($this->aFormOutputs as $oFormOutput) {

			// Compute the output value
			$oFormOutput->ComputeValue($sEventType, $oData);

		}

	}


	/**
	 * Initialize inputs.
	 *
	 * @return void
	 */
	public function InitInputs(): void
	{
	}

	/**
	 * Initialize outputs.
	 *
	 * @return void
	 */
	public function InitOutputs(): void
	{
		$this->AddOutput(self::OUTPUT_VALUE, RawFormat::class);
	}

	/**
	 * Called when a binding value has been transmitted.
	 *
	 * @param AbstractFormIO $oBlockIO
	 *
	 * @return void
	 */
	public function BindingReceivedEvent(AbstractFormIO $oBlockIO): void
	{
		if ($this->IsInputsDataReady()) {
			$this->AllInputsReadyEvent();
		}
	}

	/**
	 * Called when all inputs are ready.
	 *
	 * @return void
	 */
	public function AllInputsReadyEvent(): void
	{

	}
}