<?php
/**
 * Plugin Name: Claude API WordPress Plugin
 * Description: Integrates Anthropic Claude API into WordPress.
 * Version: 1.0.0
 * Author: CodeAtoZ
 * Requires PHP: 8.1
 */

declare(strict_types=1);

namespace CodeAtoZClaudePlugin;

// Claude API WordPress plugin bootstrap
define( 'CAZ_CLAUDE_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
define( 'CAZ_CLAUDE_PLUGIN_URL', plugin_dir_url( __FILE__ ) );

// Autoload plugin classes
spl_autoload_register( function( string $class ): void {
    $prefix = 'CodeAtoZ\ClaudePlugin\';
    if ( str_starts_with( $class, $prefix ) ) {
        $relative = str_replace( [$prefix, '\'], ['', DIRECTORY_SEPARATOR], $class );
        require CAZ_CLAUDE_PLUGIN_DIR . 'includes/' . $relative . '.php';
    }
});

// Initialise Claude API WordPress plugin
add_action( 'plugins_loaded', function(): void {
    $api = new ApiClaudeClient(
        get_option( 'caz_claude_api_key', '' ),
        get_option( 'caz_claude_model', 'claude-sonnet-4-6' )
    );

    new AdminSettingsPage( $api );
    new RestClaudeEndpoint( $api );
});

register_activation_hook( __FILE__, function(): void {
    // Ensure option exists on Claude API WordPress plugin activation
    add_option( 'caz_claude_api_key', '' );
    add_option( 'caz_claude_model', 'claude-sonnet-4-6' );
});

<?php
namespace CodeAtoZClaudePluginApi;

class ClaudeClient
{
    private const API_URL = 'https://api.anthropic.com/v1/messages';

    public function __construct(
        private readonly string $apiKey,
        private readonly string $model = 'claude-sonnet-4-6'
    ) {}

    /**
     * Send a prompt to the Claude API WordPress plugin client.
     *
     * @param string $prompt   User message
     * @param string $system   Optional system instruction
     * @param int    $maxTokens Response token limit
     * @return string          Claude's response text
     */
    public function prompt(
        string $prompt,
        string $system    = '',
        int    $maxTokens = 1000
    ): string {
        if ( empty( $this->apiKey ) ) {
            return '';
        }

        $body = [
            'model'      => $this->model,
            'max_tokens' => $maxTokens,
            'messages'   => [[ 'role' => 'user', 'content' => $prompt ]],
        ];

        if ( $system ) {
            $body['system'] = $system;
        }

        $response = wp_remote_post( self::API_URL, [
            'headers' => [
                'x-api-key'         => $this->apiKey,
                'anthropic-version' => '2023-06-01',
                'Content-Type'      => 'application/json',
            ],
            'body'    => wp_json_encode( $body ),
            'timeout' => 30,
        ]);

        if ( is_wp_error( $response ) ) {
            error_log( 'Claude API WordPress plugin error: ' . $response->get_error_message() );
            return '';
        }

        $data = json_decode( wp_remote_retrieve_body( $response ), true );
        return $data['content'][0]['text'] ?? '';
    }
}

<?php
namespace CodeAtoZClaudePluginAdmin;

class SettingsPage
{
    public function __construct(
        private readonly CodeAtoZClaudePluginApiClaudeClient $api
    ) {
        add_action( 'admin_menu',    [$this, 'register_menu'] );
        add_action( 'admin_init',   [$this, 'register_settings'] );
    }

    public function register_menu(): void {
        add_options_page(
            'Claude API WordPress Plugin Settings',
            'Claude API', 'manage_options', 'caz-claude', [$this, 'render']
        );
    }

    public function register_settings(): void {
        register_setting( 'caz_claude_settings', 'caz_claude_api_key', [
            'sanitize_callback' => 'sanitize_text_field',
        ]);
        register_setting( 'caz_claude_settings', 'caz_claude_model', [
            'sanitize_callback' => 'sanitize_text_field',
        ]);
    }

    public function render(): void {
        if ( ! current_user_can( 'manage_options' ) ) return;
        ?>
        <div class="wrap">
            <h1>Claude API WordPress Plugin Settings</h1>
            <form method="post" action="options.php">
                <?php settings_fields( 'caz_claude_settings' ); ?>
                <table class="form-table">
                    <tr><th>API Key</th><td>
                        <input type="password" name="caz_claude_api_key"
                               value="<?= esc_attr( get_option('caz_claude_api_key') ) ?>"
                               class="regular-text"/>
                    </td></tr>
                    <tr><th>Model</th><td>
                        <select name="caz_claude_model">
                            <option value="claude-sonnet-4-6">Claude Sonnet 4.6</option>
                            <option value="claude-haiku-4-5-20251001">Claude Haiku 4.5</option>
                        </select>
                    </td></tr>
                </table>
                <?php submit_button( 'Save Claude API Settings' ); ?>
            </form>
        </div>
        <?php
    }
}