<?php
/**
 * Eagle Booking Advanced Pricing - Deals and Discounts Management
 *
 * @package EB_Advanced_Pricing
 * @since 1.0.0
 */

defined('ABSPATH') || exit;

class EB_AP_Deals {
    
    private static $instance = null;
    
    public static function instance() {
        if (is_null(self::$instance)) {
            self::$instance = new self();
        }
        return self::$instance;
    }
    
    private function __construct() {
        // Constructor
    }
    
    /**
     * Create a new deal
     *
     * @param array $deal_data
     * @return bool|int
     */
    public function create_deal($deal_data) {
        global $wpdb;
        
        $data = array(
            'room_id' => $deal_data['room_id'],
            'deal_type' => $deal_data['deal_type'],
            'deal_name' => $deal_data['deal_name'],
            'discount_type' => $deal_data['discount_type'],
            'discount_value' => $deal_data['discount_value'],
            'date_from' => $deal_data['date_from'],
            'date_to' => $deal_data['date_to'],
            'min_stay' => isset($deal_data['min_stay']) ? $deal_data['min_stay'] : 1,
            'max_stay' => isset($deal_data['max_stay']) ? $deal_data['max_stay'] : 0,
            'advance_booking_days' => isset($deal_data['advance_booking_days']) ? $deal_data['advance_booking_days'] : 0,
            'is_active' => isset($deal_data['is_active']) ? $deal_data['is_active'] : 1,
            'priority' => isset($deal_data['priority']) ? $deal_data['priority'] : 0,
            'created_at' => current_time('mysql'),
            'updated_at' => current_time('mysql')
        );
        
        $result = $wpdb->insert(
            EB_AP_TABLE_DEALS,
            $data,
            array('%d', '%s', '%s', '%s', '%f', '%s', '%s', '%d', '%d', '%d', '%d', '%d', '%s', '%s')
        );
        
        return $result ? $wpdb->insert_id : false;
    }
    
    /**
     * Update an existing deal
     *
     * @param int $deal_id
     * @param array $deal_data
     * @return bool
     */
    public function update_deal($deal_id, $deal_data) {
        global $wpdb;
        
        $deal_data['updated_at'] = current_time('mysql');
        
        $result = $wpdb->update(
            EB_AP_TABLE_DEALS,
            $deal_data,
            array('id' => $deal_id),
            array('%d', '%s', '%s', '%s', '%f', '%s', '%s', '%d', '%d', '%d', '%d', '%d', '%s'),
            array('%d')
        );
        
        return $result !== false;
    }
    
    /**
     * Delete a deal
     *
     * @param int $deal_id
     * @return bool
     */
    public function delete_deal($deal_id) {
        global $wpdb;
        
        $result = $wpdb->delete(
            EB_AP_TABLE_DEALS,
            array('id' => $deal_id),
            array('%d')
        );
        
        return $result !== false;
    }
    
    /**
     * Get deal by ID
     *
     * @param int $deal_id
     * @return array|null
     */
    public function get_deal($deal_id) {
        global $wpdb;
        
        $deal = $wpdb->get_row($wpdb->prepare(
            "SELECT * FROM " . EB_AP_TABLE_DEALS . " WHERE id = %d",
            $deal_id
        ), ARRAY_A);
        
        return $deal;
    }
    
    /**
     * Get deals for a specific room
     *
     * @param int $room_id
     * @param bool $active_only
     * @return array
     */
    public function get_room_deals($room_id, $active_only = true) {
        global $wpdb;
        
        $where_clause = "room_id = %d";
        $params = array($room_id);
        
        if ($active_only) {
            $where_clause .= " AND is_active = 1";
        }
        
        $deals = $wpdb->get_results($wpdb->prepare(
            "SELECT * FROM " . EB_AP_TABLE_DEALS . " WHERE $where_clause ORDER BY priority DESC, discount_value DESC",
            $params
        ), ARRAY_A);
        
        return $deals;
    }
    
    /**
     * Get applicable deals for a booking
     *
     * @param int $room_id
     * @param string $checkin_date
     * @param string $checkout_date
     * @param int $nights
     * @param string $booking_date
     * @return array
     */
    public function get_applicable_deals($room_id, $checkin_date, $checkout_date, $nights, $booking_date = null) {
        if (!$booking_date) {
            $booking_date = current_time('Y-m-d');
        }
        
        global $wpdb;
        
        $applicable_deals = $wpdb->get_results($wpdb->prepare(
            "SELECT * FROM " . EB_AP_TABLE_DEALS . " 
             WHERE room_id = %d 
             AND is_active = 1 
             AND date_from <= %s 
             AND date_to >= %s 
             AND (min_stay = 0 OR min_stay <= %d) 
             AND (max_stay = 0 OR max_stay >= %d) 
             AND (advance_booking_days = 0 OR DATEDIFF(%s, %s) >= advance_booking_days)
             ORDER BY priority DESC, discount_value DESC",
            $room_id,
            $checkin_date,
            $checkout_date,
            $nights,
            $nights,
            $checkin_date,
            $booking_date
        ), ARRAY_A);
        
        return $applicable_deals;
    }
    
    /**
     * Apply deals to a price
     *
     * @param float $original_price
     * @param int $room_id
     * @param string $checkin_date
     * @param string $checkout_date
     * @param int $nights
     * @param string $booking_date
     * @return array
     */
    public function apply_deals($original_price, $room_id, $checkin_date, $checkout_date, $nights, $booking_date = null) {
        $applicable_deals = $this->get_applicable_deals($room_id, $checkin_date, $checkout_date, $nights, $booking_date);
        
        if (empty($applicable_deals)) {
            return array(
                'original_price' => $original_price,
                'discounted_price' => $original_price,
                'discount_amount' => 0,
                'applied_deals' => array()
            );
        }
        
        $deal_priority = get_option('eb_ap_deal_priority', 'highest_discount');
        $best_deal = null;
        $best_discount = 0;
        
        foreach ($applicable_deals as $deal) {
            $discount_amount = $this->calculate_discount($original_price, $deal);
            
            if ($discount_amount > $best_discount) {
                $best_discount = $discount_amount;
                $best_deal = $deal;
            }
        }
        
        if ($best_deal) {
            $discounted_price = $original_price - $best_discount;
            
            return array(
                'original_price' => $original_price,
                'discounted_price' => max(0, $discounted_price),
                'discount_amount' => $best_discount,
                'applied_deals' => array($best_deal)
            );
        }
        
        return array(
            'original_price' => $original_price,
            'discounted_price' => $original_price,
            'discount_amount' => 0,
            'applied_deals' => array()
        );
    }
    
    /**
     * Calculate discount amount for a deal
     *
     * @param float $price
     * @param array $deal
     * @return float
     */
    private function calculate_discount($price, $deal) {
        $discount_amount = 0;
        
        switch ($deal['discount_type']) {
            case 'percentage':
                $discount_amount = $price * ($deal['discount_value'] / 100);
                break;
                
            case 'fixed':
                $discount_amount = $deal['discount_value'];
                break;
                
            case 'fixed_per_night':
                // This would need nights parameter passed through
                $discount_amount = $deal['discount_value'];
                break;
        }
        
        return $discount_amount;
    }
    
    /**
     * Get deal types
     *
     * @return array
     */
    public function get_deal_types() {
        return array(
            'early_bird' => __('Early Bird Discount', 'eb-advanced-pricing'),
            'last_minute' => __('Last Minute Deal', 'eb-advanced-pricing'),
            'length_of_stay' => __('Length of Stay Discount', 'eb-advanced-pricing'),
            'mobile_rate' => __('Mobile Rate', 'eb-advanced-pricing'),
            'secret_deal' => __('Secret Deal', 'eb-advanced-pricing'),
            'seasonal' => __('Seasonal Promotion', 'eb-advanced-pricing'),
            'weekend_special' => __('Weekend Special', 'eb-advanced-pricing'),
            'weekday_special' => __('Weekday Special', 'eb-advanced-pricing'),
            'loyalty_discount' => __('Loyalty Discount', 'eb-advanced-pricing'),
            'group_discount' => __('Group Discount', 'eb-advanced-pricing'),
            'flash_sale' => __('Flash Sale', 'eb-advanced-pricing'),
            'custom' => __('Custom Deal', 'eb-advanced-pricing')
        );
    }
    
    /**
     * Get discount types
     *
     * @return array
     */
    public function get_discount_types() {
        return array(
            'percentage' => __('Percentage (%)', 'eb-advanced-pricing'),
            'fixed' => __('Fixed Amount', 'eb-advanced-pricing'),
            'fixed_per_night' => __('Fixed Amount per Night', 'eb-advanced-pricing')
        );
    }
    
    /**
     * Create early bird deal
     *
     * @param int $room_id
     * @param string $name
     * @param int $advance_days
     * @param float $discount_value
     * @param string $discount_type
     * @param string $date_from
     * @param string $date_to
     * @return bool|int
     */
    public function create_early_bird_deal($room_id, $name, $advance_days, $discount_value, $discount_type, $date_from, $date_to) {
        $deal_data = array(
            'room_id' => $room_id,
            'deal_type' => 'early_bird',
            'deal_name' => $name,
            'discount_type' => $discount_type,
            'discount_value' => $discount_value,
            'date_from' => $date_from,
            'date_to' => $date_to,
            'advance_booking_days' => $advance_days,
            'min_stay' => 1,
            'max_stay' => 0,
            'is_active' => 1,
            'priority' => 5
        );
        
        return $this->create_deal($deal_data);
    }
    
    /**
     * Create length of stay deal
     *
     * @param int $room_id
     * @param string $name
     * @param int $min_nights
     * @param float $discount_value
     * @param string $discount_type
     * @param string $date_from
     * @param string $date_to
     * @return bool|int
     */
    public function create_length_of_stay_deal($room_id, $name, $min_nights, $discount_value, $discount_type, $date_from, $date_to) {
        $deal_data = array(
            'room_id' => $room_id,
            'deal_type' => 'length_of_stay',
            'deal_name' => $name,
            'discount_type' => $discount_type,
            'discount_value' => $discount_value,
            'date_from' => $date_from,
            'date_to' => $date_to,
            'min_stay' => $min_nights,
            'max_stay' => 0,
            'advance_booking_days' => 0,
            'is_active' => 1,
            'priority' => 3
        );
        
        return $this->create_deal($deal_data);
    }
    
    /**
     * Create mobile rate deal
     *
     * @param int $room_id
     * @param string $name
     * @param float $discount_value
     * @param string $discount_type
     * @param string $date_from
     * @param string $date_to
     * @return bool|int
     */
    public function create_mobile_rate_deal($room_id, $name, $discount_value, $discount_type, $date_from, $date_to) {
        $deal_data = array(
            'room_id' => $room_id,
            'deal_type' => 'mobile_rate',
            'deal_name' => $name,
            'discount_type' => $discount_type,
            'discount_value' => $discount_value,
            'date_from' => $date_from,
            'date_to' => $date_to,
            'min_stay' => 1,
            'max_stay' => 0,
            'advance_booking_days' => 0,
            'is_active' => 1,
            'priority' => 2
        );
        
        return $this->create_deal($deal_data);
    }
    
    /**
     * Create secret deal
     *
     * @param int $room_id
     * @param string $name
     * @param float $discount_value
     * @param string $discount_type
     * @param string $date_from
     * @param string $date_to
     * @return bool|int
     */
    public function create_secret_deal($room_id, $name, $discount_value, $discount_type, $date_from, $date_to) {
        $deal_data = array(
            'room_id' => $room_id,
            'deal_type' => 'secret_deal',
            'deal_name' => $name,
            'discount_type' => $discount_type,
            'discount_value' => $discount_value,
            'date_from' => $date_from,
            'date_to' => $date_to,
            'min_stay' => 1,
            'max_stay' => 0,
            'advance_booking_days' => 0,
            'is_active' => 1,
            'priority' => 8
        );
        
        return $this->create_deal($deal_data);
    }
    
    /**
     * Apply deals to search results
     *
     * @param array $results
     * @param array $search_params
     * @return array
     */
    public function apply_deals_to_results($results, $search_params) {
        if (empty($results)) {
            return $results;
        }
        
        $checkin_date = $search_params['checkin_date'];
        $checkout_date = $search_params['checkout_date'];
        $nights = $search_params['nights'];
        $booking_date = current_time('Y-m-d');
        
        foreach ($results as &$result) {
            $room_id = $result['room_id'];
            $original_price = $result['price'];
            
            $pricing_result = $this->apply_deals($original_price, $room_id, $checkin_date, $checkout_date, $nights, $booking_date);
            
            $result['original_price'] = $pricing_result['original_price'];
            $result['discounted_price'] = $pricing_result['discounted_price'];
            $result['discount_amount'] = $pricing_result['discount_amount'];
            $result['applied_deals'] = $pricing_result['applied_deals'];
            $result['has_deals'] = !empty($pricing_result['applied_deals']);
            
            // Update the main price to discounted price
            $result['price'] = $pricing_result['discounted_price'];
        }
        
        return $results;
    }
    
    /**
     * Get deal statistics
     *
     * @param int $room_id
     * @param string $start_date
     * @param string $end_date
     * @return array
     */
    public function get_deal_statistics($room_id, $start_date, $end_date) {
        global $wpdb;
        
        $stats = $wpdb->get_results($wpdb->prepare(
            "SELECT 
                deal_type,
                COUNT(*) as count,
                AVG(discount_value) as avg_discount,
                SUM(CASE WHEN is_active = 1 THEN 1 ELSE 0 END) as active_count
             FROM " . EB_AP_TABLE_DEALS . " 
             WHERE room_id = %d 
             AND date_from >= %s 
             AND date_to <= %s 
             GROUP BY deal_type",
            $room_id,
            $start_date,
            $end_date
        ), ARRAY_A);
        
        return $stats;
    }
    
    /**
     * Activate/deactivate deal
     *
     * @param int $deal_id
     * @param bool $active
     * @return bool
     */
    public function toggle_deal_status($deal_id, $active = true) {
        global $wpdb;
        
        $result = $wpdb->update(
            EB_AP_TABLE_DEALS,
            array(
                'is_active' => $active ? 1 : 0,
                'updated_at' => current_time('mysql')
            ),
            array('id' => $deal_id),
            array('%d', '%s'),
            array('%d')
        );
        
        return $result !== false;
    }
    
    /**
     * Get all deals with optional filters
     *
     * @param array $filters
     * @return array
     */
    public function get_deals($filters = array()) {
        global $wpdb;
        
        $where_conditions = array();
        $params = array();
        
        if (!empty($filters['room_id'])) {
            $where_conditions[] = "room_id = %d";
            $params[] = $filters['room_id'];
        }
        
        if (!empty($filters['deal_type'])) {
            $where_conditions[] = "deal_type = %s";
            $params[] = $filters['deal_type'];
        }
        
        if (!empty($filters['is_active'])) {
            $where_conditions[] = "is_active = %d";
            $params[] = $filters['is_active'];
        }
        
        if (!empty($filters['date_from'])) {
            $where_conditions[] = "date_from >= %s";
            $params[] = $filters['date_from'];
        }
        
        if (!empty($filters['date_to'])) {
            $where_conditions[] = "date_to <= %s";
            $params[] = $filters['date_to'];
        }
        
        $where_clause = "";
        if (!empty($where_conditions)) {
            $where_clause = "WHERE " . implode(" AND ", $where_conditions);
        }
        
        $query = "SELECT * FROM " . EB_AP_TABLE_DEALS . " $where_clause ORDER BY priority DESC, created_at DESC";
        
        if (!empty($params)) {
            $query = $wpdb->prepare($query, $params);
        }
        
        $deals = $wpdb->get_results($query, ARRAY_A);
        
        return $deals;
    }
}