<?php
/**
 * Plugin Name: Leezy – AI Chatbot
 * Plugin URI: https://leezy.ai
 * Description: Add the Leezy AI chatbot to your WordPress site in seconds. No coding required — just enter your Bot ID and go.
 * Version: 1.0.0
 * Author: leezy.ai
 * Author URI: https://leezy.ai
 * License: GPL-2.0+
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain: leezy
 * Requires at least: 5.0
 * Requires PHP: 7.4
 * Tested up to: 6.7
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

define( 'LEEZY_VERSION', '1.0.0' );
define( 'LEEZY_PLUGIN_FILE', __FILE__ );
define( 'LEEZY_PLUGIN_DIR', plugin_dir_path( __FILE__ ) );
define( 'LEEZY_PLUGIN_URL', plugin_dir_url( __FILE__ ) );
define( 'LEEZY_EMBED_URL', 'https://leezy.ai/embed.js' );

/**
 * Default options.
 */
function leezy_defaults() {
    return array(
        'bot_id'       => '',
        'theme'        => 'light',
        'lang'         => 'en',
        'position'     => 'bottom-right',
        'button_color' => '',
        'auto_open'    => false,
        'open_delay'   => 0,
        'greeting'     => '',
    );
}

/**
 * Get a single option value.
 */
function leezy_get_option( $key ) {
    $options  = get_option( 'leezy_options', array() );
    $defaults = leezy_defaults();
    return isset( $options[ $key ] ) ? $options[ $key ] : ( isset( $defaults[ $key ] ) ? $defaults[ $key ] : '' );
}

/* ──────────────────────────────────────────────
 * Admin Menu & Settings
 * ────────────────────────────────────────────── */

add_action( 'admin_menu', 'leezy_admin_menu' );

function leezy_admin_menu() {
    add_menu_page(
        __( 'Leezy Settings', 'leezy' ),
        __( 'Leezy', 'leezy' ),
        'manage_options',
        'leezy',
        'leezy_settings_page',
        plugins_url( 'assets/images/favicon.svg', __FILE__ ),
        80
    );
}

add_action( 'admin_init', 'leezy_register_settings' );

function leezy_register_settings() {
    register_setting( 'leezy_settings', 'leezy_options', array(
        'type'              => 'array',
        'sanitize_callback' => 'leezy_sanitize_options',
        'default'           => leezy_defaults(),
    ) );

    add_settings_section(
        'leezy_main',
        __( 'Chatbot Configuration', 'leezy' ),
        'leezy_section_main_cb',
        'leezy'
    );

    $fields = array(
        'bot_id'       => array( 'label' => __( 'Bot ID', 'leezy' ), 'cb' => 'leezy_field_bot_id' ),
        'theme'        => array( 'label' => __( 'Theme', 'leezy' ), 'cb' => 'leezy_field_theme' ),
        'lang'         => array( 'label' => __( 'Language', 'leezy' ), 'cb' => 'leezy_field_lang' ),
        'position'     => array( 'label' => __( 'Widget Position', 'leezy' ), 'cb' => 'leezy_field_position' ),
        'button_color' => array( 'label' => __( 'Button Color', 'leezy' ), 'cb' => 'leezy_field_button_color' ),
        'auto_open'    => array( 'label' => __( 'Auto-Open', 'leezy' ), 'cb' => 'leezy_field_auto_open' ),
        'open_delay'   => array( 'label' => __( 'Open Delay (ms)', 'leezy' ), 'cb' => 'leezy_field_open_delay' ),
        'greeting'     => array( 'label' => __( 'Greeting Message', 'leezy' ), 'cb' => 'leezy_field_greeting' ),
    );

    foreach ( $fields as $id => $field ) {
        add_settings_field( "leezy_{$id}", $field['label'], $field['cb'], 'leezy', 'leezy_main' );
    }
}

function leezy_sanitize_options( $input ) {
    $clean = leezy_defaults();

    $clean['bot_id'] = isset( $input['bot_id'] ) ? sanitize_text_field( $input['bot_id'] ) : '';
    $clean['theme']  = isset( $input['theme'] ) && in_array( $input['theme'], array( 'light', 'dark' ), true ) ? $input['theme'] : 'light';
    $clean['lang']   = isset( $input['lang'] ) ? sanitize_text_field( substr( $input['lang'], 0, 10 ) ) : 'en';

    $positions        = array( 'bottom-right', 'bottom-left', 'top-right', 'top-left' );
    $clean['position'] = isset( $input['position'] ) && in_array( $input['position'], $positions, true ) ? $input['position'] : 'bottom-right';

    $clean['button_color'] = isset( $input['button_color'] ) ? sanitize_hex_color( $input['button_color'] ) : '';
    if ( null === $clean['button_color'] ) {
        $clean['button_color'] = '';
    }

    $clean['auto_open']  = ! empty( $input['auto_open'] );
    $clean['open_delay'] = isset( $input['open_delay'] ) ? absint( $input['open_delay'] ) : 0;
    $clean['greeting']   = isset( $input['greeting'] ) ? sanitize_text_field( $input['greeting'] ) : '';

    return $clean;
}

/* ── Section Callback ─────────────────────── */

function leezy_section_main_cb() {
    echo '<p>' . wp_kses(
        __( 'Connect your Leezy chatbot. Find your Bot ID in your <a href="https://leezy.ai/dashboard" target="_blank" rel="noopener">Leezy dashboard</a> under Settings → Installation.', 'leezy' ),
        array( 'a' => array( 'href' => array(), 'target' => array(), 'rel' => array() ) )
    ) . '</p>';
    echo '<p>' . wp_kses(
        __( 'Don\'t have an account yet? <a href="https://leezy.ai/signup" target="_blank" rel="noopener">Sign up for free</a> to create your AI chatbot.', 'leezy' ),
        array( 'a' => array( 'href' => array(), 'target' => array(), 'rel' => array() ) )
    ) . '</p>';
}

/* ── Field Callbacks ──────────────────────── */

function leezy_field_bot_id() {
    $val = leezy_get_option( 'bot_id' );
    echo '<input type="text" name="leezy_options[bot_id]" value="' . esc_attr( $val ) . '" class="regular-text" placeholder="e.g. abc123-def456" required />';
    echo '<p class="description">' . esc_html__( 'Your unique chatbot identifier from the Leezy dashboard.', 'leezy' ) . '</p>';
}

function leezy_field_theme() {
    $val = leezy_get_option( 'theme' );
    echo '<select name="leezy_options[theme]">';
    echo '<option value="light"' . selected( $val, 'light', false ) . '>' . esc_html__( 'Light', 'leezy' ) . '</option>';
    echo '<option value="dark"' . selected( $val, 'dark', false ) . '>' . esc_html__( 'Dark', 'leezy' ) . '</option>';
    echo '</select>';
}

function leezy_field_lang() {
    $val = leezy_get_option( 'lang' );
    $languages = array(
        'en' => 'English', 'de' => 'Deutsch', 'fr' => 'Français', 'es' => 'Español',
        'it' => 'Italiano', 'pt' => 'Português', 'nl' => 'Nederlands', 'pl' => 'Polski',
        'ru' => 'Русский', 'ja' => '日本語', 'ko' => '한국어', 'zh' => '中文',
        'ar' => 'العربية', 'tr' => 'Türkçe', 'sv' => 'Svenska', 'da' => 'Dansk',
        'fi' => 'Suomi', 'nb' => 'Norsk', 'cs' => 'Čeština', 'uk' => 'Українська',
    );
    echo '<select name="leezy_options[lang]">';
    foreach ( $languages as $code => $label ) {
        echo '<option value="' . esc_attr( $code ) . '"' . selected( $val, $code, false ) . '>' . esc_html( $label ) . '</option>';
    }
    echo '</select>';
    echo '<p class="description">' . esc_html__( 'The chatbot interface language. Your bot responds in 50+ languages regardless of this setting.', 'leezy' ) . '</p>';
}

function leezy_field_position() {
    $val = leezy_get_option( 'position' );
    $opts = array(
        'bottom-right' => __( 'Bottom Right', 'leezy' ),
        'bottom-left'  => __( 'Bottom Left', 'leezy' ),
        'top-right'    => __( 'Top Right', 'leezy' ),
        'top-left'     => __( 'Top Left', 'leezy' ),
    );
    echo '<select name="leezy_options[position]">';
    foreach ( $opts as $k => $label ) {
        echo '<option value="' . esc_attr( $k ) . '"' . selected( $val, $k, false ) . '>' . esc_html( $label ) . '</option>';
    }
    echo '</select>';
}

function leezy_field_button_color() {
    $val = leezy_get_option( 'button_color' );
    echo '<input type="text" name="leezy_options[button_color]" value="' . esc_attr( $val ) . '" class="leezy-color-field" placeholder="#0A84FF" />';
    echo '<p class="description">' . esc_html__( 'Leave empty to use your chatbot\'s configured color.', 'leezy' ) . '</p>';
}

function leezy_field_auto_open() {
    $val = leezy_get_option( 'auto_open' );
    echo '<label><input type="checkbox" name="leezy_options[auto_open]" value="1"' . checked( $val, true, false ) . ' /> ';
    echo esc_html__( 'Automatically open the chatbot when a visitor loads the page.', 'leezy' ) . '</label>';
}

function leezy_field_open_delay() {
    $val = leezy_get_option( 'open_delay' );
    echo '<input type="number" name="leezy_options[open_delay]" value="' . esc_attr( $val ) . '" min="0" step="100" class="small-text" />';
    echo '<p class="description">' . esc_html__( 'Delay in milliseconds before auto-opening. Only applies when Auto-Open is enabled.', 'leezy' ) . '</p>';
}

function leezy_field_greeting() {
    $val = leezy_get_option( 'greeting' );
    echo '<input type="text" name="leezy_options[greeting]" value="' . esc_attr( $val ) . '" class="regular-text" placeholder="' . esc_attr__( 'Hi! How can I help you today?', 'leezy' ) . '" />';
    echo '<p class="description">' . esc_html__( 'Custom greeting message. Leave empty to use the default from your Leezy dashboard.', 'leezy' ) . '</p>';
}

/* ── Settings Page ────────────────────────── */

function leezy_settings_page() {
    if ( ! current_user_can( 'manage_options' ) ) {
        return;
    }
    ?>
    <div class="wrap leezy-wrap">
        <div class="leezy-header">
            <img src="<?php echo esc_url( LEEZY_PLUGIN_URL . 'assets/images/logo.png' ); ?>" alt="Leezy" class="leezy-logo" />
            <span class="leezy-version">v<?php echo esc_html( LEEZY_VERSION ); ?></span>
        </div>

        <?php settings_errors(); ?>

        <div class="leezy-card">
            <form method="post" action="options.php">
                <?php
                settings_fields( 'leezy_settings' );
                do_settings_sections( 'leezy' );
                submit_button( __( 'Save Settings', 'leezy' ) );
                ?>
            </form>
        </div>

        <div class="leezy-card leezy-card--help">
            <h3><?php esc_html_e( 'Need Help?', 'leezy' ); ?></h3>
            <p><?php esc_html_e( 'Visit your Leezy dashboard to manage your chatbot, train it on your content, and view analytics.', 'leezy' ); ?></p>
            <a href="https://leezy.ai/dashboard" target="_blank" rel="noopener" class="button button-secondary"><?php esc_html_e( 'Open Dashboard', 'leezy' ); ?></a>
            <a href="https://leezy.ai/docs" target="_blank" rel="noopener" class="button button-link"><?php esc_html_e( 'Documentation', 'leezy' ); ?></a>
        </div>
    </div>
    <?php
}

/* ── Admin Styles ─────────────────────────── */

add_action( 'admin_enqueue_scripts', 'leezy_admin_assets' );

function leezy_admin_assets( $hook ) {
    if ( 'toplevel_page_leezy' !== $hook ) {
        return;
    }
    wp_enqueue_style( 'leezy-admin', LEEZY_PLUGIN_URL . 'assets/css/admin.css', array(), LEEZY_VERSION );
    wp_enqueue_style( 'wp-color-picker' );
    wp_enqueue_script( 'wp-color-picker' );
    wp_add_inline_script( 'wp-color-picker', "
        jQuery(document).ready(function($){
            $('.leezy-color-field').wpColorPicker();
        });
    " );
}

/* ──────────────────────────────────────────────
 * Frontend: Embed Script Injection
 * ────────────────────────────────────────────── */

add_action( 'wp_footer', 'leezy_embed_script' );

function leezy_embed_script() {
    // Don't load in admin, on login page, or during previews in customizer.
    if ( is_admin() || is_customize_preview() ) {
        return;
    }

    $bot_id = leezy_get_option( 'bot_id' );
    if ( empty( $bot_id ) ) {
        return;
    }

    // Validate bot ID format.
    if ( ! preg_match( '/^[a-zA-Z0-9\-_]+$/', $bot_id ) ) {
        return;
    }

    $attrs = array(
        'data-bot-id' => esc_attr( $bot_id ),
    );

    // Optional attributes — only add if set.
    $theme = leezy_get_option( 'theme' );
    if ( $theme && 'light' !== $theme ) {
        $attrs['data-theme'] = esc_attr( $theme );
    }

    $lang = leezy_get_option( 'lang' );
    if ( $lang && 'en' !== $lang ) {
        $attrs['data-lang'] = esc_attr( $lang );
    }

    $position = leezy_get_option( 'position' );
    if ( $position && 'bottom-right' !== $position ) {
        $attrs['data-position'] = esc_attr( $position );
    }

    $color = leezy_get_option( 'button_color' );
    if ( ! empty( $color ) ) {
        $attrs['data-button-color'] = esc_attr( $color );
    }

    $auto_open = leezy_get_option( 'auto_open' );
    if ( $auto_open ) {
        $attrs['data-auto-open'] = 'true';

        $delay = leezy_get_option( 'open_delay' );
        if ( $delay > 0 ) {
            $attrs['data-open-delay'] = intval( $delay );
        }
    }

    $greeting = leezy_get_option( 'greeting' );
    if ( ! empty( $greeting ) ) {
        $attrs['data-greeting'] = esc_attr( $greeting );
    }

    $attr_str = '';
    foreach ( $attrs as $key => $value ) {
        $attr_str .= ' ' . $key . '="' . $value . '"';
    }

    // phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedScript
    echo '<script async defer src="' . esc_url( LEEZY_EMBED_URL ) . '"' . $attr_str . '></script>' . "\n";
}

/* ──────────────────────────────────────────────
 * Activation & Plugin Links
 * ────────────────────────────────────────────── */

register_activation_hook( __FILE__, 'leezy_activate' );

function leezy_activate() {
    if ( false === get_option( 'leezy_options' ) ) {
        add_option( 'leezy_options', leezy_defaults() );
    }
    set_transient( 'leezy_activation_redirect', true, 30 );
}

add_action( 'admin_init', 'leezy_activation_redirect' );

function leezy_activation_redirect() {
    if ( get_transient( 'leezy_activation_redirect' ) ) {
        delete_transient( 'leezy_activation_redirect' );
        if ( ! isset( $_GET['activate-multi'] ) ) {
            wp_safe_redirect( admin_url( 'admin.php?page=leezy' ) );
            exit;
        }
    }
}

// Add "Settings" link on Plugins page.
add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), 'leezy_action_links' );

function leezy_action_links( $links ) {
    $settings_link = '<a href="' . admin_url( 'admin.php?page=leezy' ) . '">' . __( 'Settings', 'leezy' ) . '</a>';
    array_unshift( $links, $settings_link );
    return $links;
}

// Admin notice if Bot ID not configured.
add_action( 'admin_notices', 'leezy_admin_notice' );

function leezy_admin_notice() {
    $bot_id = leezy_get_option( 'bot_id' );
    if ( ! empty( $bot_id ) ) {
        return;
    }

    $screen = get_current_screen();
    if ( $screen && 'toplevel_page_leezy' === $screen->id ) {
        return;
    }

    echo '<div class="notice notice-warning is-dismissible"><p>';
    printf(
        /* translators: %s: link to settings page */
        esc_html__( 'Leezy AI Chatbot is active but not configured. %s to connect your chatbot.', 'leezy' ),
        '<a href="' . esc_url( admin_url( 'admin.php?page=leezy' ) ) . '">' . esc_html__( 'Go to Settings', 'leezy' ) . '</a>'
    );
    echo '</p></div>';
}

/* ──────────────────────────────────────────────
 * Uninstall: Clean up options
 * ────────────────────────────────────────────── */

register_uninstall_hook( __FILE__, 'leezy_uninstall' );

function leezy_uninstall() {
    delete_option( 'leezy_options' );
}