<?php

namespace AIContentWriter\Admin;

defined( 'ABSPATH' ) || exit; // Exit if accessed directly.

/**
 * Class ClassicEditor.
 *
 * Adds the AI writer to classic-editor (TinyMCE) screens — including
 * WooCommerce product descriptions — via an "AI Writer" media button that
 * opens a generate/modify modal and inserts the result through
 * window.send_to_editor(), which targets the active Visual or Text editor.
 * Reuses the same `aicw/v1/generateContent` REST endpoint as the block editor.
 *
 * @since 2.3.0
 * @package AIContentWriter\Admin
 */
class ClassicEditor {

	/**
	 * Constructor.
	 */
	public function __construct() {
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_assets' ) );
		add_action( 'media_buttons', array( $this, 'render_button' ), 15 );
		add_action( 'elementor/editor/after_enqueue_scripts', array( $this, 'enqueue_for_elementor' ) );
	}

	/**
	 * Whether the current screen hosts a classic (non-block) editor.
	 *
	 * @since 2.3.0
	 * @return bool
	 */
	protected function is_classic_editor_screen(): bool {
		if ( ! function_exists( 'get_current_screen' ) ) {
			return false;
		}

		$screen = get_current_screen();

		if ( ! $screen || 'post' !== $screen->base ) {
			return false;
		}

		// Block-editor screens are handled by Admin\BlockEditor.
		return ! ( method_exists( $screen, 'is_block_editor' ) && $screen->is_block_editor() );
	}

	/**
	 * Enqueue the classic editor assets.
	 *
	 * @since 2.3.0
	 * @return void
	 */
	public function enqueue_assets() {
		if ( ! $this->is_classic_editor_screen() ) {
			return;
		}

		$this->enqueue();
	}

	/**
	 * Enqueue the classic editor assets inside the Elementor editor.
	 *
	 * @since 2.4.2
	 * @return void
	 */
	public function enqueue_for_elementor() {
		$this->enqueue();
		wp_enqueue_style( 'aicw-elementor-editor', AICW_ASSETS_URL . 'css/aicw-elementor-editor.css', array( 'aicw-classic-editor' ), AICW_VERSION );
	}

	/**
	 * Register, localize and enqueue the classic editor assets.
	 *
	 * @since 2.4.2
	 * @return void
	 */
	protected function enqueue() {
		wp_enqueue_style( 'aicw-classic-editor', AICW_ASSETS_URL . 'css/aicw-classic-editor.css', array(), AICW_VERSION );
		wp_enqueue_script( 'aicw-classic-editor', AICW_ASSETS_URL . 'js/aicw-classic-editor.js', array( 'jquery' ), AICW_VERSION, true );

		$provider = aicw_get_ai_provider( get_option( 'aicw_api_model' ) );

		$tones = array();
		foreach ( aicw_get_content_tones() as $tone_value => $tone_label ) {
			$tones[] = array(
				'value' => $tone_value,
				'label' => $tone_label,
			);
		}

		$languages = array();
		foreach ( aicw_get_languages() as $language_value => $language_label ) {
			$languages[] = array(
				'value' => $language_value,
				'label' => $language_label,
			);
		}

		wp_localize_script(
			'aicw-classic-editor',
			'aicwClassicData',
			array(
				'endpoint'    => rest_url( 'aicw/v1/generateContent' ),
				'nonce'       => wp_create_nonce( 'wp_rest' ),
				'hasApiKey'   => $provider && $provider->is_configured(),
				'settingsUrl' => admin_url( 'admin.php?page=aicw-settings' ),
				'tones'       => $tones,
				'languages'   => $languages,
				'i18n'        => array(
					'title'          => __( 'AI Content Writer', 'ai-content-writer' ),
					'modeGenerate'   => __( 'Write new content', 'ai-content-writer' ),
					'modeModify'     => __( 'Rewrite selected text', 'ai-content-writer' ),
					'typeParagraph'  => __( 'Paragraph', 'ai-content-writer' ),
					'typeArticle'    => __( 'Full article', 'ai-content-writer' ),
					'topicLabel'     => __( 'Topic / keywords', 'ai-content-writer' ),
					'instructions'   => __( 'Additional instructions (optional)', 'ai-content-writer' ),
					'tone'           => __( 'Tone', 'ai-content-writer' ),
					'length'         => __( 'Length', 'ai-content-writer' ),
					'language'       => __( 'Language', 'ai-content-writer' ),
					'lengthDefault'  => __( 'Default', 'ai-content-writer' ),
					'lengthShort'    => __( 'Short', 'ai-content-writer' ),
					'lengthMedium'   => __( 'Medium', 'ai-content-writer' ),
					'lengthLong'     => __( 'Long', 'ai-content-writer' ),
					'generate'       => __( 'Generate', 'ai-content-writer' ),
					'generating'     => __( 'Generating…', 'ai-content-writer' ),
					'insert'         => __( 'Insert', 'ai-content-writer' ),
					'cancel'         => __( 'Cancel', 'ai-content-writer' ),
					'topicRequired'  => __( 'Please enter a topic or keywords.', 'ai-content-writer' ),
					'genericError'   => __( 'Something went wrong. Please try again.', 'ai-content-writer' ),
					'noApiKey'       => __( 'No AI provider is configured yet. Add your API key on the settings page.', 'ai-content-writer' ),
					'openSettings'   => __( 'Open Settings', 'ai-content-writer' ),
					'noSelection'    => __( 'Select some text in the editor first to rewrite it.', 'ai-content-writer' ),
				),
			)
		);
	}

	/**
	 * Render the "AI Writer" media button above classic editors.
	 *
	 * @param string $editor_id The editor instance ID.
	 *
	 * @since 2.3.0
	 * @return void
	 */
	public function render_button( $editor_id ) {
		if ( ! $this->is_classic_editor_screen() ) {
			return;
		}

		printf(
			'<button type="button" class="button aicw-classic-open" data-editor="%1$s"><span class="dashicons dashicons-edit-page" style="vertical-align: text-top;"></span> %2$s</button>',
			esc_attr( $editor_id ),
			esc_html__( 'AI Writer', 'ai-content-writer' )
		);
	}
}