<?php
namespace app\Models;

use Database;
use PDO;

class HrPersonModel {
    protected $db;

    public function __construct() {
        // Use the external HR database connection
        $this->db = Database::getHrConnection();
    }

    /**
     * Get person details by National ID (HR_CID)
     */
    public function getPersonByNationalId($nationalId) {
        $sql = "SELECT a.HR_CID, a.HR_FNAME, a.HR_LNAME, a.HR_POSITION_NUM,
                       b.HR_DEPARTMENT_SUB_SUB_NAME, 
                       c.HR_LEVEL_NAME, 
                       d.HR_PERSON_TYPE_NAME, 
                       e.HR_PREFIX_NAME, 
                       f.HR_POSITION_NAME
                FROM hr_person a 
                LEFT OUTER JOIN hr_department_sub_sub b on a.HR_DEPARTMENT_SUB_SUB_ID = b.HR_DEPARTMENT_SUB_SUB_ID 
                LEFT OUTER JOIN hr_level c ON a.HR_LEVEL_ID = c.HR_LEVEL_ID 
                LEFT OUTER JOIN hr_person_type d ON a.HR_PERSON_TYPE_ID = d.HR_PERSON_TYPE_ID 
                LEFT OUTER JOIN hr_prefix e ON a.HR_PREFIX_ID=e.HR_PREFIX_ID 
                LEFT OUTER JOIN hr_position f ON a.HR_POSITION_ID=f.HR_POSITION_ID 
                WHERE REPLACE(a.HR_CID, '-', '') = :cid LIMIT 1";

        try {
            $stmt = $this->db->prepare($sql);
            $stmt->execute(['cid' => $nationalId]);
            return $stmt->fetch(PDO::FETCH_ASSOC);
        } catch (\PDOException $e) {
            error_log("Error fetching HR person: " . $e->getMessage());
            return false;
        }
    }

    /**
     * Get person image by National ID (HR_CID)
     */
    public function getPersonImage($nationalId) {
        $sql = "SELECT HR_IMAGE FROM hr_person WHERE REPLACE(HR_CID, '-', '') = :cid LIMIT 1";

        try {
            $stmt = $this->db->prepare($sql);
            $stmt->execute(['cid' => $nationalId]);
            return $stmt->fetch(PDO::FETCH_ASSOC);
        } catch (\PDOException $e) {
            error_log("Error fetching HR person image: " . $e->getMessage());
            return false;
        }
    }

    /**
     * Get multiple persons by an array of National IDs
     */
    public function getPersonsByNationalIds(array $cids) {
        if (empty($cids)) {
            return [];
        }

        // Create placeholders ?, ?, ?
        $placeholders = implode(',', array_fill(0, count($cids), '?'));

        $sql = "SELECT a.HR_CID, a.HR_FNAME, a.HR_LNAME, a.HR_POSITION_NUM,
                       b.HR_DEPARTMENT_SUB_SUB_NAME, 
                       c.HR_LEVEL_NAME, 
                       d.HR_PERSON_TYPE_NAME, 
                       e.HR_PREFIX_NAME, 
                       f.HR_POSITION_NAME
                FROM hr_person a 
                LEFT OUTER JOIN hr_department_sub_sub b on a.HR_DEPARTMENT_SUB_SUB_ID = b.HR_DEPARTMENT_SUB_SUB_ID 
                LEFT OUTER JOIN hr_level c ON a.HR_LEVEL_ID = c.HR_LEVEL_ID 
                LEFT OUTER JOIN hr_person_type d ON a.HR_PERSON_TYPE_ID = d.HR_PERSON_TYPE_ID 
                LEFT OUTER JOIN hr_prefix e ON a.HR_PREFIX_ID=e.HR_PREFIX_ID 
                LEFT OUTER JOIN hr_position f ON a.HR_POSITION_ID=f.HR_POSITION_ID 
                WHERE a.HR_CID IN ($placeholders)";

        try {
            $stmt = $this->db->prepare($sql);
            $stmt->execute($cids);
            
            $results = $stmt->fetchAll(PDO::FETCH_ASSOC);
            $mapped = [];
            foreach ($results as $row) {
                $mapped[$row['HR_CID']] = $row;
            }
            return $mapped;
            
        } catch (\PDOException $e) {
            error_log("Error fetching multiple HR persons: " . $e->getMessage());
            return [];
        }
    }

    /**
     * Search persons by keyword
     */
    public function searchPersons($keyword) {
        if (empty($keyword)) {
            return [];
        }
        
        $sql = "SELECT * FROM hr_person a 
                LEFT OUTER JOIN hr_department_sub_sub b on a.HR_DEPARTMENT_SUB_SUB_ID = b.HR_DEPARTMENT_SUB_SUB_ID 
                LEFT OUTER JOIN hr_level c ON a.HR_LEVEL_ID = c.HR_LEVEL_ID 
                LEFT OUTER JOIN hr_person_type d ON a.HR_PERSON_TYPE_ID = d.HR_PERSON_TYPE_ID 
                LEFT OUTER JOIN hr_prefix e ON a.HR_PREFIX_ID=e.HR_PREFIX_ID 
                LEFT OUTER JOIN hr_position f ON a.HR_POSITION_ID=f.HR_POSITION_ID 
                WHERE (REPLACE(a.HR_CID, '-', '') = ? OR a.HR_FNAME LIKE ? OR a.HR_LNAME LIKE ?) 
                AND a.HR_STATUS_ID='01'
                LIMIT 15";

        try {
            $kw = '%' . $keyword . '%';
            $stmt = $this->db->prepare($sql);
            $stmt->execute([$keyword, $kw, $kw]);
            return $stmt->fetchAll(PDO::FETCH_ASSOC);
        } catch (\Exception $e) {
            error_log("Error searching HR persons: " . $e->getMessage());
            return [];
        }
    }
}
?>