Client contracts view added excel export option

app/Exports/ClientContractsExport.php

@@ -0,0 +1,158 @@
+<?php
+
+namespace App\Exports;
+
+use App\Models\Contract;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Support\Carbon;
+use Maatwebsite\Excel\Concerns\FromQuery;
+use Maatwebsite\Excel\Concerns\ShouldAutoSize;
+use Maatwebsite\Excel\Concerns\WithColumnFormatting;
+use Maatwebsite\Excel\Concerns\WithCustomValueBinder;
+use Maatwebsite\Excel\Concerns\WithHeadings;
+use Maatwebsite\Excel\Concerns\WithMapping;
+use PhpOffice\PhpSpreadsheet\Cell\Cell;
+use PhpOffice\PhpSpreadsheet\Cell\DataType;
+use PhpOffice\PhpSpreadsheet\Cell\DefaultValueBinder;
+use PhpOffice\PhpSpreadsheet\Shared\Date as ExcelDate;
+use PhpOffice\PhpSpreadsheet\Style\NumberFormat;
+
+class ClientContractsExport extends DefaultValueBinder implements FromQuery, ShouldAutoSize, WithColumnFormatting, WithCustomValueBinder, WithHeadings, WithMapping
+{
+    public const DATE_EXCEL_FORMAT = 'dd"."mm"."yyyy';
+
+    public const TEXT_EXCEL_FORMAT = NumberFormat::FORMAT_TEXT;
+
+    /**
+     * @var array<string, string>
+     */
+    private array $columnLetterMap = [];
+
+    /**
+     * @var array<string, array{label: string}>
+     */
+    public const COLUMN_METADATA = [
+        'reference' => ['label' => 'Referenca'],
+        'customer' => ['label' => 'Stranka'],
+        'start' => ['label' => 'Začetek'],
+        'segment' => ['label' => 'Segment'],
+        'balance' => ['label' => 'Stanje'],
+    ];
+
+    /**
+     * @param  array<int, string>  $columns
+     */
+    public function __construct(private Builder $query, private array $columns) {}
+
+    /**
+     * @return array<int, string>
+     */
+    public static function allowedColumns(): array
+    {
+        return array_keys(self::COLUMN_METADATA);
+    }
+
+    public static function columnLabel(string $column): string
+    {
+        return self::COLUMN_METADATA[$column]['label'] ?? $column;
+    }
+
+    public function query(): Builder
+    {
+        return $this->query;
+    }
+
+    /**
+     * @return array<int, mixed>
+     */
+    public function map($row): array
+    {
+        return array_map(fn (string $column) => $this->resolveValue($row, $column), $this->columns);
+    }
+
+    /**
+     * @return array<int, string>
+     */
+    public function headings(): array
+    {
+        return array_map(fn (string $column) => self::columnLabel($column), $this->columns);
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    public function columnFormats(): array
+    {
+        $formats = [];
+
+        foreach ($this->getColumnLetterMap() as $letter => $column) {
+            if ($column === 'reference') {
+                $formats[$letter] = self::TEXT_EXCEL_FORMAT;
+
+                continue;
+            }
+
+            if ($column === 'start') {
+                $formats[$letter] = self::DATE_EXCEL_FORMAT;
+            }
+        }
+
+        return $formats;
+    }
+
+    private function resolveValue(Contract $contract, string $column): mixed
+    {
+        return match ($column) {
+            'reference' => $contract->reference,
+            'customer' => optional($contract->clientCase?->person)->full_name,
+            'start' => $this->formatDate($contract->start_date),
+            'segment' => $contract->segments?->first()?->name,
+            'balance' => optional($contract->account)->balance_amount,
+            default => null,
+        };
+    }
+
+    private function formatDate(?string $date): mixed
+    {
+        if (empty($date)) {
+            return null;
+        }
+
+        try {
+            $carbon = Carbon::parse($date);
+
+            return ExcelDate::dateTimeToExcel($carbon);
+        } catch (\Exception $e) {
+            return null;
+        }
+    }
+
+    /**
+     * @return array<string, string>
+     */
+    private function getColumnLetterMap(): array
+    {
+        if ($this->columnLetterMap !== []) {
+            return $this->columnLetterMap;
+        }
+
+        $letter = 'A';
+        foreach ($this->columns as $column) {
+            $this->columnLetterMap[$letter] = $column;
+            $letter++;
+        }
+
+        return $this->columnLetterMap;
+    }
+
+    public function bindValue(Cell $cell, $value): bool
+    {
+        if (is_numeric($value)) {
+            $cell->setValueExplicit($value, DataType::TYPE_NUMERIC);
+
+            return true;
+        }
+
+        return parent::bindValue($cell, $value);
+    }
+}