<?php

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

final class ThreeDL_CC_Free_Plugin {
    public const OPTION_KEY = '3dl_cc_free_options';

    private static $instance = null;
    private $options_cache = null;

    public static function instance(): self {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    private function __construct() {}

    public static function activate(): void {
        if (get_option(self::OPTION_KEY, null) === null) {
            add_option(self::OPTION_KEY, self::default_options(), '', false);
        }
    }

    public function boot(): void {
        add_action('before_woocommerce_init', [$this, 'declare_hpos_compatibility']);

        $admin = new ThreeDL_CC_Free_Admin($this);
        $admin->hooks();

        if (!$this->woocommerce_active() || $this->pro_active()) {
            return;
        }

        $transfer = new ThreeDL_CC_Free_Transfer($this);
        $cart = new ThreeDL_CC_Free_Cart($this, $transfer);
        $status = new ThreeDL_CC_Free_Status($this);
        $transfer->set_cart($cart);
        $transfer->hooks();
        $cart->hooks();
        $status->hooks();
    }

    public function declare_hpos_compatibility(): void {
        if (class_exists('Automattic\\WooCommerce\\Utilities\\FeaturesUtil')) {
            Automattic\WooCommerce\Utilities\FeaturesUtil::declare_compatibility('custom_order_tables', THREEDL_CC_FREE_FILE, true);
        }
    }

    public static function default_options(): array {
        return [
            'mode' => 'disabled',
            'main_store_url' => '',
            'secret_key' => '',
            'trusted_sources' => '',
            'transfer_ttl' => 600,
            'after_add' => 'return_source',
        ];
    }

    public function get_options(): array {
        if (is_array($this->options_cache)) {
            return $this->options_cache;
        }
        $saved = get_option(self::OPTION_KEY, []);
        if (!is_array($saved)) {
            $saved = [];
        }
        $this->options_cache = wp_parse_args($saved, self::default_options());
        return $this->options_cache;
    }

    public function clear_options_cache(): void {
        $this->options_cache = null;
    }

    public function get_mode(): string {
        $mode = (string) ($this->get_options()['mode'] ?? 'disabled');
        return in_array($mode, ['main', 'source'], true) ? $mode : 'disabled';
    }

    public function is_main(): bool {
        return $this->get_mode() === 'main';
    }

    public function is_source(): bool {
        return $this->get_mode() === 'source';
    }

    public function get_secret(): string {
        return trim((string) ($this->get_options()['secret_key'] ?? ''));
    }

    public function main_store_url(): string {
        if ($this->is_main()) {
            return $this->normalize_url(home_url('/'));
        }
        return $this->normalize_url((string) ($this->get_options()['main_store_url'] ?? ''));
    }

    public function current_store_url(): string {
        return $this->normalize_url(home_url('/'));
    }

    public function trusted_sources(): array {
        $raw = (string) ($this->get_options()['trusted_sources'] ?? '');
        $lines = preg_split('/\r\n|\r|\n/', $raw) ?: [];
        $out = [];
        foreach ($lines as $line) {
            $url = $this->normalize_url(trim((string) $line));
            if ($url !== '') {
                $out[$url] = true;
            }
        }
        return array_keys($out);
    }

    public function transfer_ttl(): int {
        $ttl = absint($this->get_options()['transfer_ttl'] ?? 600);
        return min(1800, max(60, $ttl));
    }


    public function after_add_behavior(): string {
        $behavior = sanitize_key((string) ($this->get_options()['after_add'] ?? 'return_source'));
        return in_array($behavior, ['return_source', 'cart'], true) ? $behavior : 'return_source';
    }

    public function normalize_url(string $url): string {
        $url = esc_url_raw(trim($url));
        if ($url === '') {
            return '';
        }
        return trailingslashit(untrailingslashit($url));
    }

    public function source_is_trusted(string $source_url): bool {
        $source_url = $this->normalize_url($source_url);
        if ($source_url === '') {
            return false;
        }
        foreach ($this->trusted_sources() as $trusted) {
            if (hash_equals(strtolower($trusted), strtolower($source_url))) {
                return true;
            }
        }
        return false;
    }

    public function woocommerce_active(): bool {
        return class_exists('WooCommerce') || defined('WC_VERSION');
    }

    public function pro_active(): bool {
        return class_exists('ThreeDL_Central_Checkout');
    }

    public function environment_ready(): bool {
        return is_multisite() && $this->woocommerce_active();
    }
}