<?php

namespace RemexHtml\TreeBuilder;

use RemexHtml\Tokenizer\Attributes;

/**
 * The "in select" insertion mode
 */
class InSelect extends InsertionMode {
	public function characters( $text, $start, $length, $sourceStart, $sourceLength ) {
		$this->stripNulls(
			function ( $text, $start, $length, $sourceStart, $sourceLength ) {
				$this->builder->insertCharacters( $text, $start, $length,
					$sourceStart, $sourceLength );
			},
			$text, $start, $length, $sourceStart, $sourceLength );
	}

	public function startTag( $name, Attributes $attrs, $selfClose, $sourceStart, $sourceLength ) {
		$builder = $this->builder;
		$stack = $builder->stack;
		$dispatcher = $this->dispatcher;

		switch ( $name ) {
		case 'html':
			$dispatcher->inBody->startTag( $name, $attrs, $selfClose, $sourceStart, $sourceLength );
			break;

		case 'option':
			if ( $stack->current->htmlName === 'option' ) {
				$builder->pop( $sourceStart, 0 );
			}
			$builder->insertElement( 'option', $attrs, false, $sourceStart, $sourceLength );
			break;

		case 'optgroup':
			if ( $stack->current->htmlName === 'option' ) {
				$builder->pop( $sourceStart, 0 );
			}
			if ( $stack->current->htmlName === 'optgroup' ) {
				$builder->pop( $sourceStart, 0 );
			}
			$builder->insertElement( 'optgroup', $attrs, false, $sourceStart, $sourceLength );
			break;

		case 'select':
			if ( !$stack->isInSelectScope( 'select' ) ) {
				$builder->error( "<select> found in select mode but no select element is in " .
					"scope, ignoring", $sourceStart );
				return;
			}

			$builder->error( "<select> found inside a select element", $sourceStart );
			$builder->popAllUpToName( 'select', $sourceStart, $sourceLength );
			$dispatcher->reset();
			break;

		case 'input':
		case 'keygen':
		case 'textarea':
			$builder->error( "<$name> found inside a select element", $sourceStart );
			if ( !$stack->isInSelectScope( 'select' ) ) {
				// Ignore
				return;
			}
			$builder->popAllUpToName( 'select', $sourceStart, 0 );
			$dispatcher->reset()
				->startTag( $name, $attrs, $selfClose, $sourceStart, $sourceLength );
			break;

		case 'script':
		case 'template':
			$dispatcher->inHead->startTag( $name, $attrs, $selfClose,
				$sourceStart, $sourceLength );
			break;

		default:
			$builder->error( "<$name> found inside a select element, ignoring", $sourceStart );
		}
	}

	public function endTag( $name, $sourceStart, $sourceLength ) {
		$builder = $this->builder;
		$stack = $builder->stack;
		$dispatcher = $this->dispatcher;

		switch ( $name ) {
		case 'optgroup':
			if ( $stack->current->htmlName === 'option' ) {
				$penultimate = $stack->item( $stack->length() - 2 );
				if ( $penultimate && $penultimate->htmlName === 'optgroup' ) {
					$builder->pop( $sourceStart, 0 );
				}
			}
			if ( $stack->current->htmlName !== 'optgroup' ) {
				$builder->error( "unexpected </optgroup>, ignoring", $sourceStart );
				return;
			}
			$builder->pop( $sourceStart, $sourceLength );
			break;

		case 'option':
			if ( $stack->current->htmlName !== 'option' ) {
				$builder->error( "unexpected </option>, ignoring", $sourceStart );
				return;
			}
			$builder->pop( $sourceStart, $sourceLength );
			break;

		case 'select':
			if ( !$stack->isInSelectScope( 'select' ) ) {
				$builder->error( "</select> found but the select element is " .
					"not in scope", $sourceStart );
				return;
			}
			$builder->popAllUpToName( 'select', $sourceStart, $sourceLength );
			$dispatcher->reset();
			break;

		case 'template':
			$dispatcher->inHead->endTag( $name, $sourceStart, $sourceLength );
			break;

		default:
			$builder->error( "unexpected </$name> in select, ignoring", $sourceStart );
			break;
		}
	}

	public function endDocument( $pos ) {
		$this->dispatcher->inBody->endDocument( $pos );
	}
}