/**
 * Descomplicar® Crescimento Digital
 * https://descomplicar.pt
 */

<?php
/**
 * Restriction model for Care Booking Block plugin
 *
 * @package CareBookingBlock
 */

// Prevent direct access
if (!defined('ABSPATH')) {
    exit;
}

/**
 * Restriction model class
 */
class Care_Booking_Restriction_Model
{
    /**
     * Database handler instance
     *
     * @var Care_Booking_Database_Handler
     */
    private $db_handler;

    /**
     * Cache manager instance
     *
     * @var Care_Booking_Cache_Manager
     */
    private $cache_manager;

    /**
     * Constructor
     */
    public function __construct()
    {
        $this->db_handler = new Care_Booking_Database_Handler();
        $this->cache_manager = new Care_Booking_Cache_Manager();
    }

    /**
     * Create new restriction
     *
     * @param array $data Restriction data
     * @return int|false Restriction ID on success, false on failure
     */
    public function create($data)
    {
        // Validate data
        if (!$this->validate_restriction_data($data)) {
            return false;
        }

        // Check if restriction already exists
        $existing = $this->find_existing(
            $data['restriction_type'],
            $data['target_id'],
            isset($data['doctor_id']) ? $data['doctor_id'] : null
        );

        if ($existing) {
            // Update existing restriction
            return $this->update($existing->id, $data) ? (int) $existing->id : false;
        }

        // Create new restriction
        $result = $this->db_handler->insert($data);

        if ($result) {
            // Invalidate cache
            $this->invalidate_cache();
            
            // Trigger action
            do_action(
                'care_booking_restriction_created',
                $data['restriction_type'],
                $data['target_id'],
                isset($data['doctor_id']) ? $data['doctor_id'] : null
            );
        }

        return $result;
    }

    /**
     * Get restriction by ID
     *
     * @param int $id Restriction ID
     * @return object|false Restriction object or false if not found
     */
    public function get($id)
    {
        return $this->db_handler->get($id);
    }

    /**
     * Update restriction
     *
     * @param int   $id Restriction ID
     * @param array $data Update data
     * @return bool True on success, false on failure
     */
    public function update($id, $data)
    {
        // Validate update data
        if (!$this->validate_update_data($data)) {
            return false;
        }

        $result = $this->db_handler->update($id, $data);

        if ($result) {
            // Invalidate cache
            $this->invalidate_cache();

            // Get updated restriction for action
            $restriction = $this->get($id);
            if ($restriction) {
                // Trigger action
                do_action(
                    'care_booking_restriction_updated',
                    $restriction->restriction_type,
                    $restriction->target_id,
                    $restriction->doctor_id
                );
            }
        }

        return $result;
    }

    /**
     * Delete restriction
     *
     * @param int $id Restriction ID
     * @return bool True on success, false on failure
     */
    public function delete($id)
    {
        // Get restriction before deletion for action
        $restriction = $this->get($id);

        $result = $this->db_handler->delete($id);

        if ($result && $restriction) {
            // Invalidate cache
            $this->invalidate_cache();

            // Trigger action
            do_action(
                'care_booking_restriction_deleted',
                $restriction->restriction_type,
                $restriction->target_id,
                $restriction->doctor_id
            );
        }

        return $result;
    }

    /**
     * Get restrictions by type
     *
     * @param string $type Restriction type ('doctor' or 'service')
     * @return array Array of restriction objects
     */
    public function get_by_type($type)
    {
        return $this->db_handler->get_by_type($type);
    }

    /**
     * Get all restrictions
     *
     * @return array Array of restriction objects
     */
    public function get_all()
    {
        return $this->db_handler->get_all();
    }

    /**
     * Get blocked doctors (with caching)
     *
     * @return array Array of blocked doctor IDs
     */
    public function get_blocked_doctors()
    {
        // Try to get from cache first
        $blocked_doctors = $this->cache_manager->get_blocked_doctors();

        if ($blocked_doctors === false) {
            // Cache miss - get from database
            $blocked_doctors = $this->db_handler->get_blocked_doctors();
            
            // Cache the result
            $this->cache_manager->set_blocked_doctors($blocked_doctors);
        }

        return $blocked_doctors;
    }

    /**
     * Get blocked services for specific doctor (with caching)
     *
     * @param int $doctor_id Doctor ID
     * @return array Array of blocked service IDs
     */
    public function get_blocked_services($doctor_id)
    {
        // Try to get from cache first
        $blocked_services = $this->cache_manager->get_blocked_services($doctor_id);

        if ($blocked_services === false) {
            // Cache miss - get from database
            $blocked_services = $this->db_handler->get_blocked_services($doctor_id);
            
            // Cache the result
            $this->cache_manager->set_blocked_services($doctor_id, $blocked_services);
        }

        return $blocked_services;
    }

    /**
     * Find existing restriction
     *
     * @param string $type Restriction type
     * @param int    $target_id Target ID
     * @param int    $doctor_id Doctor ID (for service restrictions)
     * @return object|false Restriction object or false if not found
     */
    public function find_existing($type, $target_id, $doctor_id = null)
    {
        return $this->db_handler->find_existing($type, $target_id, $doctor_id);
    }

    /**
     * Toggle restriction (create if not exists, update if exists)
     *
     * @param string $type Restriction type
     * @param int    $target_id Target ID
     * @param int    $doctor_id Doctor ID (for service restrictions)
     * @param bool   $is_blocked Whether to block or unblock
     * @return int|bool Restriction ID if created, true if updated, false on failure
     */
    public function toggle($type, $target_id, $doctor_id = null, $is_blocked = true)
    {
        // Validate parameters
        if (!in_array($type, ['doctor', 'service'])) {
            return false;
        }

        if ($type === 'service' && !$doctor_id) {
            return false;
        }

        // Check if restriction exists
        $existing = $this->find_existing($type, $target_id, $doctor_id);

        if ($existing) {
            // Update existing restriction
            return $this->update($existing->id, ['is_blocked' => $is_blocked]);
        } else {
            // Create new restriction
            $data = [
                'restriction_type' => $type,
                'target_id' => $target_id,
                'is_blocked' => $is_blocked
            ];

            if ($doctor_id) {
                $data['doctor_id'] = $doctor_id;
            }

            return $this->create($data);
        }
    }

    /**
     * Bulk create restrictions
     *
     * @param array $restrictions Array of restriction data
     * @return array Array of results (IDs for successful, false for failed)
     */
    public function bulk_create($restrictions)
    {
        if (!is_array($restrictions) || empty($restrictions)) {
            return [];
        }

        $results = [];

        foreach ($restrictions as $restriction_data) {
            $result = $this->create($restriction_data);
            $results[] = $result;
        }

        return $results;
    }

    /**
     * Bulk toggle restrictions
     *
     * @param array $restrictions Array of restriction toggle data
     * @return array Array of results with success/error information
     */
    public function bulk_toggle($restrictions)
    {
        if (!is_array($restrictions) || empty($restrictions)) {
            return ['updated' => 0, 'errors' => []];
        }

        $updated = 0;
        $errors = [];

        foreach ($restrictions as $restriction_data) {
            try {
                // Validate required fields
                if (!isset($restriction_data['restriction_type']) || !isset($restriction_data['target_id'])) {
                    $errors[] = [
                        'restriction' => $restriction_data,
                        'error' => 'Missing required fields'
                    ];
                    continue;
                }

                $result = $this->toggle(
                    $restriction_data['restriction_type'],
                    $restriction_data['target_id'],
                    isset($restriction_data['doctor_id']) ? $restriction_data['doctor_id'] : null,
                    isset($restriction_data['is_blocked']) ? $restriction_data['is_blocked'] : true
                );

                if ($result) {
                    $updated++;
                } else {
                    $errors[] = [
                        'restriction' => $restriction_data,
                        'error' => 'Failed to update restriction'
                    ];
                }
            } catch (Exception $e) {
                $errors[] = [
                    'restriction' => $restriction_data,
                    'error' => $e->getMessage()
                ];
            }
        }

        return [
            'updated' => $updated,
            'errors' => $errors
        ];
    }

    /**
     * Check if doctor is blocked
     *
     * @param int $doctor_id Doctor ID
     * @return bool True if blocked, false otherwise
     */
    public function is_doctor_blocked($doctor_id)
    {
        $blocked_doctors = $this->get_blocked_doctors();
        return in_array((int) $doctor_id, $blocked_doctors);
    }

    /**
     * Check if service is blocked for specific doctor
     *
     * @param int $service_id Service ID
     * @param int $doctor_id Doctor ID
     * @return bool True if blocked, false otherwise
     */
    public function is_service_blocked($service_id, $doctor_id)
    {
        $blocked_services = $this->get_blocked_services($doctor_id);
        return in_array((int) $service_id, $blocked_services);
    }

    /**
     * Validate restriction data
     *
     * @param array $data Restriction data to validate
     * @return bool True if valid, false otherwise
     */
    private function validate_restriction_data($data)
    {
        // Check required fields
        if (!isset($data['restriction_type']) || !isset($data['target_id'])) {
            return false;
        }

        // Validate restriction type
        if (!in_array($data['restriction_type'], ['doctor', 'service'])) {
            return false;
        }

        // Validate target_id
        if (!is_numeric($data['target_id']) || (int) $data['target_id'] <= 0) {
            return false;
        }

        // Service restrictions require doctor_id
        if ($data['restriction_type'] === 'service') {
            if (!isset($data['doctor_id']) || !is_numeric($data['doctor_id']) || (int) $data['doctor_id'] <= 0) {
                return false;
            }
        }

        return true;
    }

    /**
     * Validate update data
     *
     * @param array $data Update data to validate
     * @return bool True if valid, false otherwise
     */
    private function validate_update_data($data)
    {
        if (empty($data)) {
            return false;
        }

        // Validate restriction_type if provided
        if (isset($data['restriction_type']) && !in_array($data['restriction_type'], ['doctor', 'service'])) {
            return false;
        }

        // Validate target_id if provided
        if (isset($data['target_id']) && (!is_numeric($data['target_id']) || (int) $data['target_id'] <= 0)) {
            return false;
        }

        // Validate doctor_id if provided
        if (isset($data['doctor_id']) && (!is_numeric($data['doctor_id']) || (int) $data['doctor_id'] <= 0)) {
            return false;
        }

        return true;
    }

    /**
     * Invalidate all related caches
     */
    private function invalidate_cache()
    {
        $this->cache_manager->invalidate_all();

        // Trigger cache invalidation action
        do_action('care_booking_cache_invalidated');
    }

    /**
     * Get statistics
     *
     * @return array Array of statistics
     */
    public function get_statistics()
    {
        return [
            'total_restrictions' => count($this->get_all()),
            'doctor_restrictions' => count($this->get_by_type('doctor')),
            'service_restrictions' => count($this->get_by_type('service')),
            'blocked_doctors' => count($this->get_blocked_doctors())
        ];
    }
}