<?php

namespace Modules\EcommerceFinance\Repositories;

use Modules\EcommerceFinance\Services\UpstreamReadOnlyQuery;
use Modules\EcommerceFinance\Services\UpstreamReadOnlyQueryFactory;

/**
 * Alibaba/1688 营销账户账单。
 *
 * 数据来源：JianSun.dbo.alibaba_bill。金额字段由上游按元存储。
 */
class AlibabaBillRepository
{
    private const TABLE = '[dbo].[alibaba_bill]';
    private const SOURCE = 'jiansun';

    private UpstreamReadOnlyQuery $query;

    public function __construct(
        UpstreamReadOnlyQueryFactory $factory,
        private readonly ?MarketingAccountBillMirrorRepository $mirror = null,
    ) {
        $this->query = $factory->forSource(self::SOURCE);
    }

    public function usesBusinessMirror(): bool
    {
        return $this->mirror?->ready(MarketingAccountBillMirrorRepository::ALIBABA) ?? false;
    }

    /** @return array{shops: string[], product_types: string[]} */
    public function filterOptions(): array
    {
        if ($this->usesBusinessMirror()) {
            return $this->mirror->alibabaFilterOptions();
        }

        $shops = $this->query->select(
            'SELECT DISTINCT TOP (500) shopName FROM ' . self::TABLE
                . ' WHERE shopName IS NOT NULL AND LTRIM(RTRIM(shopName)) <> \'\' ORDER BY shopName'
        );
        $types = $this->query->select(
            'SELECT DISTINCT TOP (500) tradeTypeName FROM ' . self::TABLE
                . ' WHERE tradeTypeName IS NOT NULL AND LTRIM(RTRIM(tradeTypeName)) <> \'\' ORDER BY tradeTypeName'
        );

        return [
            'shops' => array_values(array_map(static fn (array $row): string => (string) ($row['shopName'] ?? ''), $shops)),
            'product_types' => array_values(array_map(static fn (array $row): string => (string) ($row['tradeTypeName'] ?? ''), $types)),
        ];
    }

    /** @return array{rows: array<int,array<string,mixed>>, total: int} */
    public function paginate(
        ?string $shopName = null,
        ?string $productType = null,
        ?string $fromDate = null,
        ?string $toDate = null,
        int $page = 1,
        int $pageSize = 25,
    ): array {
        $page = max(1, $page);
        $pageSize = min(max(1, $pageSize), 100);

        if ($this->usesBusinessMirror()) {
            $result = $this->mirror->paginateAlibaba(
                $shopName,
                $productType,
                $fromDate,
                $toDate,
                $page,
                $pageSize,
            );

            return [
                'rows' => array_map(fn (array $row): array => $this->normalize($row), $result['rows']),
                'total' => $result['total'],
            ];
        }

        [$where, $bindings] = $this->where($shopName, $productType, $fromDate, $toDate);
        $total = (int) $this->query->scalar('SELECT COUNT(*) FROM ' . self::TABLE . ' src' . $where, $bindings);

        if ($total === 0) {
            return ['rows' => [], 'total' => 0];
        }

        $start = (($page - 1) * $pageSize) + 1;
        $end = $page * $pageSize;
        $sql = 'SELECT * FROM ('
            . 'SELECT src.id, src.shopName, src.tradeDay, src.tradeTypeName, '
            . 'src.tradeAMTIn, src.tradeAMTOut, '
            . 'ROW_NUMBER() OVER (ORDER BY src.tradeDay DESC, src.id DESC) AS rn '
            . 'FROM ' . self::TABLE . ' src' . $where
            . ') AS t WHERE t.rn BETWEEN ? AND ? ORDER BY t.rn';

        $rows = $this->query->select($sql, array_merge($bindings, [$start, $end]));

        return [
            'rows' => array_map(fn (array $row): array => $this->normalize($row), $rows),
            'total' => $total,
        ];
    }

    /** @return \Generator<int,array<string,mixed>> */
    public function exportRows(
        ?string $shopName = null,
        ?string $productType = null,
        ?string $fromDate = null,
        ?string $toDate = null,
        int $batchSize = 100,
    ): \Generator {
        if (! $this->usesBusinessMirror()) {
            throw new \RuntimeException('阿里巴巴账单共享业务镜像尚未完成同步。');
        }

        $batchSize = max(1, min(100, $batchSize));
        $page = 1;
        $exported = 0;

        do {
            $result = $this->mirror->paginateAlibaba(
                $shopName,
                $productType,
                $fromDate,
                $toDate,
                $page,
                $batchSize,
            );
            $rows = is_array($result['rows'] ?? null) ? $result['rows'] : [];
            $total = max(0, (int) ($result['total'] ?? 0));

            foreach ($rows as $row) {
                yield $this->normalize($row);
            }

            $count = count($rows);
            $exported += $count;
            $page++;
        } while ($count > 0 && $exported < $total);
    }

    /** @return array{income_total: float, expense_total: float, net: float, count: int} */
    public function summary(
        ?string $shopName = null,
        ?string $productType = null,
        ?string $fromDate = null,
        ?string $toDate = null,
    ): array {
        if ($this->usesBusinessMirror()) {
            $row = $this->mirror->summarizeAlibaba($shopName, $productType, $fromDate, $toDate);
        } else {
            [$where, $bindings] = $this->where($shopName, $productType, $fromDate, $toDate);
            $row = $this->query->first(
                'SELECT COALESCE(SUM(tradeAMTIn), 0) AS income_total, '
                    . 'COALESCE(SUM(tradeAMTOut), 0) AS expense_total, COUNT(*) AS cnt '
                    . 'FROM ' . self::TABLE . ' src' . $where,
                $bindings,
            ) ?? [];
        }
        $income = round((float) ($row['income_total'] ?? 0), 2);
        $expense = round((float) ($row['expense_total'] ?? 0), 2);

        return [
            'income_total' => $income,
            'expense_total' => $expense,
            'net' => round($income - $expense, 2),
            'count' => (int) ($row['cnt'] ?? 0),
        ];
    }

    /** @return array{0: string, 1: array<int,mixed>} */
    private function where(?string $shopName, ?string $productType, ?string $fromDate, ?string $toDate): array
    {
        $conditions = [];
        $bindings = [];
        if ($shopName !== null && $shopName !== '') {
            $conditions[] = 'src.shopName = ?';
            $bindings[] = $shopName;
        }
        if ($productType !== null && $productType !== '') {
            $conditions[] = 'src.tradeTypeName = ?';
            $bindings[] = $productType;
        }
        if ($fromDate !== null && preg_match('/^\d{4}-\d{2}-\d{2}$/', $fromDate) === 1) {
            $conditions[] = 'CAST(src.tradeDay AS date) >= CAST(? AS date)';
            $bindings[] = $fromDate;
        }
        if ($toDate !== null && preg_match('/^\d{4}-\d{2}-\d{2}$/', $toDate) === 1) {
            $conditions[] = 'CAST(src.tradeDay AS date) <= CAST(? AS date)';
            $bindings[] = $toDate;
        }

        return [$conditions === [] ? '' : ' WHERE ' . implode(' AND ', $conditions), $bindings];
    }

    private function normalize(array $row): array
    {
        return [
            'shop_name' => (string) ($row['shopName'] ?? ''),
            'trade_day' => (string) ($row['tradeDay'] ?? ''),
            'product_type' => (string) ($row['tradeTypeName'] ?? ''),
            'income_amount' => round((float) ($row['tradeAMTIn'] ?? 0), 2),
            'expense_amount' => round((float) ($row['tradeAMTOut'] ?? 0), 2),
        ];
    }
}