<?php

namespace App\Services\Admin;

use App\Models\ClassProgressReport;
use Illuminate\Database\Eloquent\Builder;

class AdminProgressQueryService
{
    public function baseIndexQuery(): Builder
    {
        return ClassProgressReport::query()
            ->from('class_progress_reports')
            ->select([
                'class_progress_reports.*',
                'cs.class_section_name',
            ])
            ->selectRaw("CONCAT(COALESCE(u.firstname, ''), ' ', COALESCE(u.lastname, '')) AS teacher_name")
            ->leftJoin('classSection as cs', 'cs.class_section_id', '=', 'class_progress_reports.class_section_id')
            ->leftJoin('users as u', 'u.id', '=', 'class_progress_reports.teacher_id');
    }

    public function applyFilters(Builder $query, array $filters): Builder
    {
        if (!empty($filters['from'])) {
            $query->where('week_start', '>=', $filters['from']);
        }

        if (!empty($filters['to'])) {
            $query->where('week_end', '<=', $filters['to']);
        }

        if (!empty($filters['class_section_id'])) {
            $query->where('class_progress_reports.class_section_id', (int) $filters['class_section_id']);
        }

        if (!empty($filters['status'])) {
            $query->where('class_progress_reports.status', $filters['status']);
        }

        return $query;
    }

    public function baseShowQuery(): Builder
    {
        return ClassProgressReport::query()
            ->from('class_progress_reports')
            ->select([
                'class_progress_reports.*',
                'cs.class_section_name',
            ])
            ->selectRaw("CONCAT(COALESCE(u.firstname, ''), ' ', COALESCE(u.lastname, '')) AS teacher_name")
            ->leftJoin('classSection as cs', 'cs.class_section_id', '=', 'class_progress_reports.class_section_id')
            ->leftJoin('users as u', 'u.id', '=', 'class_progress_reports.teacher_id');
    }

    public function groupReportsByWeekAndSection(array $rows): array
    {
        $groups = [];

        foreach ($rows as $row) {
            $key = ($row['week_start'] ?? '') . '_' . ($row['class_section_id'] ?? '');
            if ($key === '_') {
                continue;
            }

            if (!isset($groups[$key])) {
                $groups[$key] = [
                    'week_start'         => $row['week_start'] ?? null,
                    'week_end'           => $row['week_end'] ?? null,
                    'class_section_id'   => $row['class_section_id'] ?? null,
                    'class_section_name' => $row['class_section_name'] ?? '',
                    'reports'            => [],
                ];
            }

            $subject = (string) ($row['subject'] ?? 'unknown');
            $groups[$key]['reports'][$subject] = $row;
        }

        return $groups;
    }
}