<?php
namespace WooNooW\Api;

use WP_REST_Request;
use WP_REST_Response;
use WC_Coupon;

/**
 * CouponsController
 * 
 * Handles coupon CRUD operations via REST API
 * 
 * @package WooNooW\Api
 */
class CouponsController {
	
	/**
	 * Register REST API routes
	 */
	public static function register_routes() {
		// List coupons
		register_rest_route('woonoow/v1', '/coupons', [
			'methods'             => 'GET',
			'callback'            => [__CLASS__, 'list_coupons'],
			'permission_callback' => function () { return current_user_can('manage_woocommerce'); },
		]);
		
		// Get single coupon
		register_rest_route('woonoow/v1', '/coupons/(?P<id>\d+)', [
			'methods'             => 'GET',
			'callback'            => [__CLASS__, 'get_coupon'],
			'permission_callback' => function () { return current_user_can('manage_woocommerce'); },
		]);
		
		// Create coupon
		register_rest_route('woonoow/v1', '/coupons', [
			'methods'             => 'POST',
			'callback'            => [__CLASS__, 'create_coupon'],
			'permission_callback' => function () { return current_user_can('manage_woocommerce'); },
		]);
		
		// Update coupon
		register_rest_route('woonoow/v1', '/coupons/(?P<id>\d+)', [
			'methods'             => 'PUT',
			'callback'            => [__CLASS__, 'update_coupon'],
			'permission_callback' => function () { return current_user_can('manage_woocommerce'); },
		]);
		
		// Delete coupon
		register_rest_route('woonoow/v1', '/coupons/(?P<id>\d+)', [
			'methods'             => 'DELETE',
			'callback'            => [__CLASS__, 'delete_coupon'],
			'permission_callback' => function () { return current_user_can('manage_woocommerce'); },
		]);
	}
	
	/**
	 * GET /woonoow/v1/coupons
	 * List all coupons with pagination and filtering
	 */
	public static function list_coupons(WP_REST_Request $request): WP_REST_Response {
		$page = max(1, (int) $request->get_param('page') ?: 1);
		$per_page = max(1, min(100, (int) $request->get_param('per_page') ?: 20));
		$search = sanitize_text_field($request->get_param('search') ?: '');
		$discount_type = sanitize_text_field($request->get_param('discount_type') ?: '');
		
		$args = [
			'post_type'      => 'shop_coupon',
			'post_status'    => 'publish',
			'posts_per_page' => $per_page,
			'paged'          => $page,
			'orderby'        => 'date',
			'order'          => 'DESC',
		];
		
		// Search by code
		if ($search) {
			$args['s'] = $search;
		}
		
		// Filter by discount type
		if ($discount_type) {
			$args['meta_query'] = [
				[
					'key'     => 'discount_type',
					'value'   => $discount_type,
					'compare' => '=',
				],
			];
		}
		
		$query = new \WP_Query($args);
		
		$coupons = [];
		foreach ($query->posts as $post) {
			$coupon = new WC_Coupon($post->ID);
			$coupons[] = self::format_coupon($coupon);
		}
		
		return new WP_REST_Response([
			'coupons'    => $coupons,
			'total'      => $query->found_posts,
			'page'       => $page,
			'per_page'   => $per_page,
			'total_pages' => $query->max_num_pages,
		], 200);
	}
	
	/**
	 * GET /woonoow/v1/coupons/{id}
	 * Get single coupon
	 */
	public static function get_coupon(WP_REST_Request $request): WP_REST_Response {
		$id = (int) $request->get_param('id');
		$coupon = new WC_Coupon($id);
		
		if (!$coupon->get_id()) {
			return new WP_REST_Response([
				'error' => 'not_found',
				'message' => __('Coupon not found', 'woonoow'),
			], 404);
		}
		
		return new WP_REST_Response(self::format_coupon($coupon, true), 200);
	}
	
	/**
	 * POST /woonoow/v1/coupons
	 * Create new coupon
	 */
	public static function create_coupon(WP_REST_Request $request): WP_REST_Response {
		$data = $request->get_json_params();
		
		// Validate required fields
		if (empty($data['code'])) {
			return new WP_REST_Response([
				'error' => 'missing_code',
				'message' => __('Coupon code is required', 'woonoow'),
			], 400);
		}
		
		// Check if code already exists
		$existing = get_page_by_title($data['code'], OBJECT, 'shop_coupon');
		if ($existing) {
			return new WP_REST_Response([
				'error' => 'code_exists',
				'message' => __('Coupon code already exists', 'woonoow'),
			], 400);
		}
		
		try {
			$coupon = new WC_Coupon();
			self::update_coupon_data($coupon, $data);
			$coupon->save();
			
			return new WP_REST_Response(self::format_coupon($coupon, true), 201);
		} catch (\Exception $e) {
			return new WP_REST_Response([
				'error' => 'create_failed',
				'message' => __('Failed to create coupon', 'woonoow'),
			], 500);
		}
	}
	
	/**
	 * PUT /woonoow/v1/coupons/{id}
	 * Update coupon
	 */
	public static function update_coupon(WP_REST_Request $request): WP_REST_Response {
		$id = (int) $request->get_param('id');
		$data = $request->get_json_params();
		
		$coupon = new WC_Coupon($id);
		if (!$coupon->get_id()) {
			return new WP_REST_Response([
				'error' => 'not_found',
				'message' => __('Coupon not found', 'woonoow'),
			], 404);
		}
		
		try {
			self::update_coupon_data($coupon, $data);
			$coupon->save();
			
			return new WP_REST_Response(self::format_coupon($coupon, true), 200);
		} catch (\Exception $e) {
			return new WP_REST_Response([
				'error' => 'update_failed',
				'message' => __('Failed to update coupon', 'woonoow'),
			], 500);
		}
	}
	
	/**
	 * DELETE /woonoow/v1/coupons/{id}
	 * Delete coupon
	 */
	public static function delete_coupon(WP_REST_Request $request): WP_REST_Response {
		$id = (int) $request->get_param('id');
		$force = $request->get_param('force') === 'true';
		
		$coupon = new WC_Coupon($id);
		if (!$coupon->get_id()) {
			return new WP_REST_Response([
				'error' => 'not_found',
				'message' => __('Coupon not found', 'woonoow'),
			], 404);
		}
		
		$result = wp_delete_post($id, $force);
		
		if (!$result) {
			return new WP_REST_Response([
				'error' => 'delete_failed',
				'message' => __('Failed to delete coupon', 'woonoow'),
			], 500);
		}
		
		return new WP_REST_Response([
			'success' => true,
			'id' => $id,
		], 200);
	}
	
	/**
	 * Format coupon for API response
	 * 
	 * @param WC_Coupon $coupon
	 * @param bool $full Include full details
	 * @return array
	 */
	private static function format_coupon(WC_Coupon $coupon, bool $full = false): array {
		$data = [
			'id'            => $coupon->get_id(),
			'code'          => $coupon->get_code(),
			'amount'        => (float) $coupon->get_amount(),
			'discount_type' => $coupon->get_discount_type(),
			'description'   => $coupon->get_description(),
			'usage_count'   => $coupon->get_usage_count(),
			'usage_limit'   => $coupon->get_usage_limit() ?: null,
			'date_expires'  => $coupon->get_date_expires() ? $coupon->get_date_expires()->date('Y-m-d') : null,
		];
		
		if ($full) {
			$data = array_merge($data, [
				'individual_use'        => $coupon->get_individual_use(),
				'product_ids'           => $coupon->get_product_ids(),
				'excluded_product_ids'  => $coupon->get_excluded_product_ids(),
				'usage_limit_per_user'  => $coupon->get_usage_limit_per_user() ?: null,
				'limit_usage_to_x_items' => $coupon->get_limit_usage_to_x_items() ?: null,
				'free_shipping'         => $coupon->get_free_shipping(),
				'product_categories'    => $coupon->get_product_categories(),
				'excluded_product_categories' => $coupon->get_excluded_product_categories(),
				'exclude_sale_items'    => $coupon->get_exclude_sale_items(),
				'minimum_amount'        => $coupon->get_minimum_amount() ? (float) $coupon->get_minimum_amount() : null,
				'maximum_amount'        => $coupon->get_maximum_amount() ? (float) $coupon->get_maximum_amount() : null,
				'email_restrictions'    => $coupon->get_email_restrictions(),
			]);
		}
		
		return $data;
	}
	
	/**
	 * Update coupon data from request
	 * 
	 * @param WC_Coupon $coupon
	 * @param array $data
	 */
	private static function update_coupon_data(WC_Coupon $coupon, array $data) {
		if (isset($data['code'])) {
			$coupon->set_code(sanitize_text_field($data['code']));
		}
		
		if (isset($data['amount'])) {
			$coupon->set_amount((float) $data['amount']);
		}
		
		if (isset($data['discount_type'])) {
			$coupon->set_discount_type(sanitize_text_field($data['discount_type']));
		}
		
		if (isset($data['description'])) {
			$coupon->set_description(wp_kses_post($data['description']));
		}
		
		if (isset($data['date_expires'])) {
			$coupon->set_date_expires($data['date_expires'] ? $data['date_expires'] : null);
		}
		
		if (isset($data['individual_use'])) {
			$coupon->set_individual_use((bool) $data['individual_use']);
		}
		
		if (isset($data['product_ids'])) {
			$coupon->set_product_ids(array_map('intval', (array) $data['product_ids']));
		}
		
		if (isset($data['excluded_product_ids'])) {
			$coupon->set_excluded_product_ids(array_map('intval', (array) $data['excluded_product_ids']));
		}
		
		if (isset($data['usage_limit'])) {
			$coupon->set_usage_limit($data['usage_limit'] ? (int) $data['usage_limit'] : null);
		}
		
		if (isset($data['usage_limit_per_user'])) {
			$coupon->set_usage_limit_per_user($data['usage_limit_per_user'] ? (int) $data['usage_limit_per_user'] : null);
		}
		
		if (isset($data['limit_usage_to_x_items'])) {
			$coupon->set_limit_usage_to_x_items($data['limit_usage_to_x_items'] ? (int) $data['limit_usage_to_x_items'] : null);
		}
		
		if (isset($data['free_shipping'])) {
			$coupon->set_free_shipping((bool) $data['free_shipping']);
		}
		
		if (isset($data['product_categories'])) {
			$coupon->set_product_categories(array_map('intval', (array) $data['product_categories']));
		}
		
		if (isset($data['excluded_product_categories'])) {
			$coupon->set_excluded_product_categories(array_map('intval', (array) $data['excluded_product_categories']));
		}
		
		if (isset($data['exclude_sale_items'])) {
			$coupon->set_exclude_sale_items((bool) $data['exclude_sale_items']);
		}
		
		if (isset($data['minimum_amount'])) {
			$coupon->set_minimum_amount($data['minimum_amount'] ? (float) $data['minimum_amount'] : '');
		}
		
		if (isset($data['maximum_amount'])) {
			$coupon->set_maximum_amount($data['maximum_amount'] ? (float) $data['maximum_amount'] : '');
		}
		
		if (isset($data['email_restrictions'])) {
			$coupon->set_email_restrictions(array_map('sanitize_email', (array) $data['email_restrictions']));
		}
	}
}