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<?php

namespace Mautic\ReportBundle\Crate;

use Mautic\CoreBundle\Twig\Helper\FormatterHelper;

class ReportDataResult
{
    private int $totalResults;

    /**
     * @var array
     */
    private $data;

    /**
     * @var array
     */
    private $headers = [];

    /**
     * @var array
     */
    private $types = [];

    /**
     * @var array<string>
     */
    private array $columnKeys = [];

    /**
     * @var array<mixed>
     */
    private array $graphs = [];

    private ?\DateTime $dateFrom;

    private ?\DateTime $dateTo;

    private ?int $limit;

    private int $page;

    /**
     * @param array<mixed> $data
     * @param array<mixed> $totals
     */
    public function __construct(
        array $data,
        private array $totals = [],
        private int $preBatchSize = 0,
        private bool $isLastBatch = true
    ) {
        if (
            !array_key_exists('data', $data)
            || !array_key_exists('dataColumns', $data)
            || !array_key_exists('columns', $data)
        ) {
            throw new \InvalidArgumentException("Keys 'data', 'dataColumns' and 'columns' have to be provided");
        }

        $this->totalResults = (int) $data['totalResults'];
        $this->data         = $data['data'];
        $this->graphs       = $data['graphs'] ?? [];
        $this->dateFrom     = $data['dateFrom'] ?? null;
        $this->dateTo       = $data['dateTo'] ?? null;
        $this->limit        = isset($data['limit']) ? (int) $data['limit'] : null;
        $this->page         = isset($data['page']) ? (int) $data['page'] : 1;
        $this->columnKeys   = isset($this->data[0]) ? array_keys($this->data[0]) : [];

        $this->buildHeader($data);
        $this->buildTypes($data);
        $this->buildTotals($data['aggregatorColumns'] ?? []);
    }

    public function getTotalResults(): int
    {
        return $this->totalResults;
    }

    /**
     * @return array
     */
    public function getData()
    {
        return $this->data;
    }

    public function getDataCount(): int
    {
        return count($this->data);
    }

    /**
     * @return array
     */
    public function getHeaders()
    {
        return $this->headers;
    }

    /**
     * @param string $column
     *
     * @return string
     */
    public function getType($column)
    {
        return $this->types[$column] ?? 'string';
    }

    /**
     * @return array<mixed>
     */
    public function getTotals(): array
    {
        return $this->totals;
    }

    /**
     * @return array<mixed>
     */
    public function getGraphs(): array
    {
        return $this->graphs;
    }

    public function getDateTo(): ?\DateTime
    {
        return $this->dateTo;
    }

    public function getDateFrom(): ?\DateTime
    {
        return $this->dateFrom;
    }

    /**
     * @return array<string>
     */
    public function getTotalsToExport(FormatterHelper $formatterHelper): array
    {
        if (empty($this->totals)) {
            return [];
        }

        foreach ($this->columnKeys as $key) {
            if (isset($this->totals[$key])) {
                $type            = $this->getType($key);
                $totalsRow[$key] = $formatterHelper->_($this->totals[$key], $type, true);
            } else {
                $totalsRow[$key] = '';
            }
        }

        return $totalsRow ?? [];
    }

    public function isLastPage(): bool
    {
        // No limit set
        if (empty($this->limit)) {
            return true;
        }

        return $this->page == ceil($this->totalResults / $this->limit);
    }

    /**
     * @return array<int, string>
     */
    public function getColumnKeys(): array
    {
        return $this->columnKeys;
    }

    /**
     * @param array $data
     */
    private function buildHeader($data): void
    {
        foreach ($this->columnKeys as $k) {
            $dataColumn      = $data['dataColumns'][$k];
            $label           = $data['columns'][$dataColumn]['label'];

            // Aggregated column
            if (isset($data['aggregatorColumns'][$k])) {
                $this->headers[] = str_replace($dataColumn, $label, $k);
            } else {
                $this->headers[] = $data['columns'][$dataColumn]['label'];
            }
        }
    }

    /**
     * @param array $data
     */
    private function buildTypes($data): void
    {
        foreach ($this->columnKeys as $k) {
            if (isset($data['aggregatorColumns']) && array_key_exists($k, $data['aggregatorColumns'])) {
                $this->types[$k] = (str_starts_with($k, 'AVG')) ? 'float' : 'int';
            } else {
                $dataColumn      = $data['dataColumns'][$k];
                $this->types[$k] = $data['columns'][$dataColumn]['type'];
            }
        }
    }

    /**
     * @param array<mixed> $aggregatorVal
     */
    public function calcTotal(string $calcFunction, int $rowsCount, array &$aggregatorVal, ?float $previousVal = null): float|int|null
    {
        switch ($calcFunction) {
            case 'COUNT':
            case 'SUM':
                return ($previousVal ?? 0) + array_sum($aggregatorVal);
            case 'AVG':
                $sum = ($previousVal ?? 0) + array_sum($aggregatorVal);
                if ($this->isLastBatch) {
                    return round($sum / $rowsCount, FormatterHelper::FLOAT_PRECISION);
                }

                return $sum;
            case 'MAX':
                if (!is_null($previousVal)) {
                    $aggregatorVal[] = $previousVal;
                }

                return max($aggregatorVal);
            case 'MIN':
                if (!is_null($previousVal)) {
                    $aggregatorVal[] = $previousVal;
                }

                return min($aggregatorVal);
            default:
                return $previousVal;
        }
    }

    /**
     * @param array<string> $aggregators
     */
    private function buildTotals(array $aggregators): void
    {
        $dataCount = count($this->data) + $this->preBatchSize;

        if ($aggregators && !empty(array_keys($this->data))) {
            foreach ($aggregators as $j => $v) {
                $aggregatorVal = array_column($this->data, $j);

                if ($aggregatorVal) {
                    $calcFunc         = $this->getAggregatorCalcFunc($j, $v);
                    $this->totals[$j] = $this->calcTotal($calcFunc, $dataCount, $aggregatorVal, $this->totals[$j] ?? null);
                }
            }
        }
    }

    private function getAggregatorCalcFunc(string $index, string $value): string
    {
        return trim(str_replace($value, '', $index));
    }
}