<?php
namespace App\Models;

use CodeIgniter\Model;

class ClassSectionModel extends Model
{
    protected $table = 'classSection'; // Correct table name
    protected $primaryKey = 'id'; // Specify the primary key field

    protected $allowedFields = [
        'class_id',
        'class_section_id',
        'class_section_name',
        'created_at',
        'updated_at',
    ];

    protected $useTimestamps = true;
    protected $createdField = 'created_at';
    protected $updatedField = 'updated_at';

    // Set default return type
    protected $returnType = 'array';

    // Method to get class sections with class and section names
    public function getClassSections(): array
    {
        return $this->select('classSection.class_section_id, classSection.class_section_name, classes.class_name')
            ->join('classes', 'classSection.class_id = classes.id', 'left')
            ->orderBy('classSection.class_section_name', 'ASC')
            ->findAll();
    }

    /**
 * Get the parent class_id for a given class_section_id.
 *
 * @param int|string $classSectionId
 * @return int|null  class_id if found, otherwise null
 */
public function getClassId($classSectionId): ?int
{
    if ($classSectionId === null || $classSectionId === '') {
        return null;
    }

    $row = $this->select('class_id')
                ->where('class_section_id', $classSectionId)
                ->orderBy($this->primaryKey, 'DESC') // in case of duplicates, take latest
                ->first();

    return $row ? (int) $row['class_id'] : null;
}

    /**
     * Get the class_section_name for a given section_id.
     *
     * @param int|string $sectionId
     * @return string|null
     */
    public function getClassSectionNameBySectionId($sectionId)
    {
        $result = $this->where('class_section_id', $sectionId)->first();
        return $result['class_section_name'] ?? null;
    }

    public function getClassSectionNameByClassId($classId)
    {
        $result = $this->where('class_id', $classId)->first();
        return $result['class_section_name'] ?? null;
    }

    /**
     * Get section ID from class section name.
     *
     * @param string $classSectionName The name of the class section.
     * @return mixed The section ID or null if no match is found.
     */
    public function getSectionIDFromClassSectionName($classSectionName)
    {
        // Query the table to find the class section by its name
        $result = $this->where('class_section_name', $classSectionName)
                       ->first(); // Get the first result (assuming class section name is unique)

        // Return the class section_id if the result is found, otherwise return null
        return $result ? $result['class_section_id'] : null;
    }

    /**
     * Return the base (non-letter) section row for a given class_id. E.g., '3' vs '3-A'.
     */
    public function getBaseSectionByClassId(int $classId): ?array
    {
        // Heuristic: names without a dash are base sections (e.g., '3', 'KG', 'youth')
        return $this->where('class_id', $classId)
            ->where("class_section_name NOT LIKE '%-%'", null, false)
            ->orderBy('id', 'ASC')
            ->first();
    }

    /**
     * Return lettered sections for a class (e.g., '3-A','3-B',...). Ordered by name asc.
     */
    public function getLetterSectionsByClassId(int $classId): array
    {
        return $this->where('class_id', $classId)
            ->like('class_section_name', '-', 'both')
            ->orderBy('class_section_name', 'ASC')
            ->findAll();
    }

}