Add AI writing assistant plugin with local backend, brave search, and image generation support

- Implement local backend AI provider with Ollama integration
- Add Brave Search API integration for real-time search suggestions
- Add image generation manager with multiple AI providers
- Create hybrid provider system with local/cloud fallback
- Add comprehensive settings UI with provider management
- Implement Gutenberg sidebar with writing assistance controls
- Add SEO schema generation for AI-generated content
- Multiple provider support: OpenRouter, local backend, Codex

includes/class-openrouter-provider.php

@@ -17,7 +17,7 @@ if ( ! defined( 'ABSPATH' ) ) {
  *
  * @since 0.1.0
  */
-class WP_Agentic_Writer_OpenRouter_Provider {
+class WP_Agentic_Writer_OpenRouter_Provider implements WP_Agentic_Writer_AI_Provider_Interface {
 
 	/**
 	 * API key.
@@ -598,51 +598,130 @@ class WP_Agentic_Writer_OpenRouter_Provider {
 	}
 
 	/**
-	 * Generate image.
+	 * Generate image using OpenRouter image generation API.
 	 *
 	 * @since 0.1.0
 	 * @param string $prompt Image prompt.
-	 * @return array|WP_Error Response array with image URL or WP_Error on failure.
+	 * @param string $model Image model (optional, uses default if not provided).
+	 * @param array  $options Additional options (size, quality, n).
+	 * @return array|WP_Error Response with image URL or error.
 	 */
-	public function generate_image( $prompt ) {
-		// Check API key.
+	public function generate_image( $prompt, $model = null, $options = array() ) {
 		if ( empty( $this->api_key ) ) {
-			return new WP_Error(
-				'no_api_key',
-				__( 'OpenRouter API key is not configured.', 'wp-agentic-writer' )
-			);
+			return new WP_Error( 'no_api_key', 'OpenRouter API key not configured' );
 		}
 
-		$messages = array(
+		$model   = $model ?? $this->image_model;
+		$size    = $options['size'] ?? '1024x576';
+		$quality = $options['quality'] ?? 'hd';
+		$n       = $options['n'] ?? 1;
+
+		$start_time = microtime( true );
+
+		$response = wp_remote_post(
+			'https://openrouter.ai/api/v1/images/generations',
 			array(
-				'role' => 'user',
-				'content' => sprintf(
-					'Generate an image based on this prompt: %s. Return only the image URL.',
-					$prompt
+				'headers' => array(
+					'Authorization'  => 'Bearer ' . $this->api_key,
+					'Content-Type'   => 'application/json',
+					'HTTP-Referer'   => home_url(),
+					'X-Title'        => get_bloginfo( 'name' ),
 				),
-			),
+				'body'    => wp_json_encode(
+					array(
+						'model'   => $model,
+						'prompt'  => $prompt,
+						'n'       => $n,
+						'size'    => $size,
+						'quality' => $quality,
+					)
+				),
+				'timeout' => 60,
+			)
 		);
 
-		$response = $this->chat( $messages, array( 'model' => $this->image_model ), 'image' );
+		$generation_time = microtime( true ) - $start_time;
 
 		if ( is_wp_error( $response ) ) {
 			return $response;
 		}
 
-		// Extract image URL from response.
-		$content = $response['content'];
-		$url = '';
+		$body = json_decode( wp_remote_retrieve_body( $response ), true );
 
-		// Try to extract URL from content.
-		if ( preg_match( '/https?:\/\/[^\s]+\.(?:png|jpg|jpeg|gif|webp)/i', $content, $matches ) ) {
-			$url = $matches[0];
+		if ( ! isset( $body['data'][0]['url'] ) ) {
+			return new WP_Error(
+				'image_generation_failed',
+				$body['error']['message'] ?? 'Unknown error'
+			);
 		}
 
 		return array(
-			'url' => $url,
-			'prompt' => $prompt,
-			'cost' => $response['cost'],
-			'model' => $response['model'],
+			'url'             => $body['data'][0]['url'],
+			'cost'            => $body['usage']['cost'] ?? 0.03,
+			'generation_time' => $generation_time,
+			'model'           => $model,
+			'prompt'          => $prompt,
+		);
+	}
+
+	/**
+	 * Check if provider is configured
+	 *
+	 * @return bool True if API key is set.
+	 */
+	public function is_configured() {
+		return ! empty( $this->api_key );
+	}
+
+	/**
+	 * Test connection to OpenRouter API
+	 *
+	 * @return array|WP_Error Success array or error.
+	 */
+	public function test_connection() {
+		if ( ! $this->is_configured() ) {
+			return new WP_Error( 'not_configured', 'OpenRouter API key not configured' );
+		}
+
+		$response = wp_remote_get(
+			'https://openrouter.ai/api/v1/models',
+			array(
+				'headers' => array(
+					'Authorization' => 'Bearer ' . $this->api_key,
+				),
+				'timeout' => 10,
+			)
+		);
+
+		if ( is_wp_error( $response ) ) {
+			return $response;
+		}
+
+		$code = wp_remote_retrieve_response_code( $response );
+		if ( 200 !== $code ) {
+			return new WP_Error(
+				'connection_failed',
+				sprintf( 'OpenRouter API returned status %d', $code )
+			);
+		}
+
+		return array(
+			'success' => true,
+			'message' => 'Connected to OpenRouter successfully',
+		);
+	}
+
+	/**
+	 * Check if provider supports task type
+	 *
+	 * @param string $type Task type.
+	 * @return bool True (OpenRouter supports all task types).
+	 */
+	public function supports_task_type( $type ) {
+		return in_array(
+			$type,
+			array( 'chat', 'clarity', 'planning', 'writing', 'refinement', 'image' ),
+			true
 		);
 	}
 }