<?php
namespace App\Models;

/**
 * Class Therapist
 * Therapist & Workload Model (Smart Queue Balancer Support)
 *
 * @package App\Models
 */
class Therapist extends Model
{
    protected string $table = 'therapists';

    /**
     * Get all therapists with User profile details
     */
    public function getWithProfiles(int $branchId = null): array
    {
        $sql = "SELECT t.*, u.national_id, u.title, u.first_name, u.last_name, u.phone, u.email 
                FROM `{$this->table}` t 
                JOIN `users` u ON t.user_id = u.id 
                WHERE t.is_active = 1 ";
        $params = [];
        if ($branchId !== null) {
            $sql .= " AND t.branch_id = :bid ";
            $params['bid'] = $branchId;
        }
        $sql .= " ORDER BY t.current_workload_score ASC, t.id ASC";
        
        $stmt = self::getDB()->prepare($sql);
        $stmt->execute($params);
        return $stmt->fetchAll();
    }

    /**
     * Get Available Therapists matching specific skill in a branch
     */
    public function getAvailableBySkill(int $branchId, string $skillName): array
    {
        $sql = "SELECT t.*, u.title, u.first_name, u.last_name 
                FROM `{$this->table}` t 
                JOIN `users` u ON t.user_id = u.id 
                WHERE t.branch_id = :bid 
                  AND t.is_available = 1 
                  AND t.is_active = 1 
                  AND JSON_CONTAINS(t.skills, :skill) 
                ORDER BY t.current_workload_score ASC";
        $stmt = self::getDB()->prepare($sql);
        $stmt->execute([
            'bid' => $branchId,
            'skill' => json_encode($skillName, JSON_UNESCAPED_UNICODE),
        ]);
        return $stmt->fetchAll();
    }

    /**
     * Update Availability Status
     */
    public function setAvailability(int $therapistId, bool $available): bool
    {
        return $this->update($therapistId, ['is_available' => $available ? 1 : 0]);
    }

    /**
     * Get Daily Workload Summary from View
     */
    public function getWorkloadSummary(int $branchId = null): array
    {
        $sql = "SELECT * FROM `vw_therapist_workload_summary`";
        $params = [];
        if ($branchId !== null) {
            $sql .= " WHERE branch_id = :bid";
            $params['bid'] = $branchId;
        }
        $stmt = self::getDB()->prepare($sql);
        $stmt->execute($params);
        return $stmt->fetchAll();
    }
}