<?php

namespace Modules\EcommerceFinance\Repositories;

use Illuminate\Database\ConnectionInterface;
use Illuminate\Database\Query\Builder;
use Illuminate\Support\Facades\DB;

/**
 * 发货明细只读仓库。读取扁平表 jst_oms_shipping（对齐工作平台发货数据 47 列），
 * 供“发货数据”页面展示与后续快递运费核算使用。
 */
class ShippingOrderRepository
{
    private readonly ConnectionInterface $db;

    public function __construct()
    {
        $this->db = DB::connection((string) config('jushuitan.connection', 'jushuitan_local'));
    }

    /**
     * @param array<string,string> $filters
     * @return array{data:array,total:int}
     */
    public function paginate(array $filters, int $page, int $perPage): array
    {
        $page = max($page, 1);
        $perPage = min(max($perPage, 1), 100);

        $q = $this->filteredQuery($filters);

        $total = (clone $q)->count();
        $rows = (clone $q)
            ->orderByDesc('ship_time')
            ->orderByDesc('id')
            ->forPage($page, $perPage)
            ->get()
            ->map(fn ($r) => (array) $r)
            ->all();

        return ['data' => $rows, 'total' => $total];
    }

    /**
     * @param array<string,string> $filters
     * @return \Generator<int,array<string,mixed>>
     */
    public function exportRows(array $filters, int $batchSize = 1000): \Generator
    {
        $batchSize = min(max($batchSize, 1), 5000);
        $lastId = null;

        while (true) {
            $query = $this->filteredQuery($filters);
            if ($lastId !== null) {
                $query->where('id', '>', $lastId);
            }

            $rows = $query->orderBy('id')->limit($batchSize)->get()->all();
            if ($rows === []) {
                return;
            }

            foreach ($rows as $row) {
                yield (array) $row;
            }

            $lastId = (int) $rows[array_key_last($rows)]->id;
            if (count($rows) < $batchSize) {
                return;
            }
        }
    }

    /** @param array<string,string> $filters */
    private function filteredQuery(array $filters): Builder
    {
        $query = $this->db->table('jst_oms_shipping');

        if (($filters['express_no'] ?? '') !== '') {
            $query->where('express_no', '=', trim((string) $filters['express_no']));
        }
        if (($filters['sourceno'] ?? '') !== '') {
            $query->where('trade_no', '=', trim((string) $filters['sourceno']));
        }

        foreach (['barcode', 'supplier_name', 'shop_name', 'warehouse_name'] as $column) {
            if (($filters[$column] ?? '') !== '') {
                $query->whereRaw($column . " LIKE ? ESCAPE '!'", [$this->contains((string) $filters[$column])]);
            }
        }

        if (($filters['express_company'] ?? '') !== '') {
            $value = $this->contains((string) $filters['express_company']);
            $query->where(static function (Builder $courier) use ($value): void {
                $courier->whereRaw("express_name1 LIKE ? ESCAPE '!'", [$value])
                    ->orWhereRaw("express_name2 LIKE ? ESCAPE '!'", [$value]);
            });
        }

        if (($filters['ship_from'] ?? '') !== '') {
            $query->where('ship_time', '>=', $filters['ship_from'] . ' 00:00:00');
        }
        if (($filters['ship_to'] ?? '') !== '') {
            $query->where('ship_time', '<', date('Y-m-d 00:00:00', strtotime($filters['ship_to'] . ' +1 day')));
        }

        return $query;
    }

    private function contains(string $value): string
    {
        return '%' . str_replace(['!', '%', '_'], ['!!', '!%', '!_'], trim($value)) . '%';
    }

    /**
     * 取某字段去重候选值（供筛选框自动补全）。
     * @return array<int,string>
     */
    public function distinctValues(string $field, string $keyword, int $limit = 20): array
    {
        $map = [
            'supplier_name'   => ['supplier_name'],
            'shop_name'       => ['shop_name'],
            'warehouse_name'  => ['warehouse_name'],
            'express_company' => ['express_name1', 'express_name2'],
        ];
        if (! isset($map[$field])) {
            return [];
        }
        $limit = min(max($limit, 1), 50);
        $like = $this->contains($keyword);
        $values = [];
        foreach ($map[$field] as $col) {
            $rows = $this->db->table('jst_oms_shipping')
                ->selectRaw($col . ' as v')
                ->whereRaw($col . " LIKE ? ESCAPE '!'", [$like])
                ->whereNotNull($col)
                ->where($col, '<>', '')
                ->groupBy($col)
                ->orderBy($col)
                ->limit($limit)
                ->pluck('v');
            foreach ($rows as $v) {
                $v = trim((string) $v);
                if ($v !== '') {
                    $values[$v] = true;
                }
            }
        }
        $values = array_keys($values);
        sort($values, SORT_FLAG_CASE | SORT_STRING);

        return array_slice($values, 0, $limit);
    }

    /** 同步状态（供页面显示同步中/最近完成）。 */
    public function syncStatus(): array
    {
        try {
            $row = $this->db->table('jst_sync_state')->where('dataset_key', 'jst.sctrade')->first();
            if (! $row) {
                return ['code' => 'unavailable', 'last_succeeded_at' => null];
            }

            return [
                'code' => (string) ($row->status ?? 'unavailable'),
                'last_succeeded_at' => $row->last_succeeded_at ?? null,
            ];
        } catch (\Throwable) {
            return ['code' => 'unavailable', 'last_succeeded_at' => null];
        }
    }
}