<?php

namespace Modules\EcommerceFinance\Repositories;

use Illuminate\Database\ConnectionInterface;
use Illuminate\Support\Facades\Schema;
use Modules\EcommerceFinance\Services\DingPayableWorkflowStatus;
use RuntimeException;

class DingPayableWorkflowMirrorRepository
{
    public const DATASET_KEY = 'operations_replica.rpt.ding_payable_workflows';

    public const PROCESS_CODE = 'PROC-39DD70DE-DAB2-4A5F-B8F1-0B0B68BD0C88';

    private readonly ConnectionInterface $connection;

    public function __construct(GenericBusinessMirrorRepository $mirror)
    {
        $this->connection = $mirror->connection();
    }

    public function ready(): bool
    {
        $schema = Schema::connection($this->connection->getName());
        if (! $schema->hasTable('ding_payable_workflow_mirror') || ! $schema->hasTable('business_mirror_table_states')) {
            return false;
        }

        $state = $this->connection->table('business_mirror_table_states')
            ->where('dataset_key', self::DATASET_KEY)->first();

        return $state !== null && $state->initial_completed_at !== null;
    }

    /** @return array{data:list<array<string,mixed>>,total:int,status:string,last_synced_at:?string} */
    public function paginate(array $filters, int $page, int $perPage): array
    {
        if (! $this->ready()) {
            throw new RuntimeException('business_mirror_dataset_not_ready');
        }

        $page = max($page, 1);
        $perPage = min(max($perPage, 1), 100);
        $state = $this->connection->table('business_mirror_table_states')->where('dataset_key', self::DATASET_KEY)->first();
        // 先在镜像库按固定业务关键词缩小候选流程，再解析 JSON；避免为每次页面请求
        // 解码全部历史表单。关键词来自本任务的固定业务筛选，不是用户拼接 SQL。
        // “仓”覆盖江西仓、重庆仓等实际用途写法；后续仍在解析明细时
        // 同时校验类型和车费，避免仅因其他字段出现“仓”而误收流程。
        $records = $this->connection->table('ding_payable_workflow_mirror')
            ->where('scheme_payload', 'like', '%快递运费%')
            ->where('scheme_payload', 'like', '%仓%')
            ->where('scheme_payload', 'like', '%车费%')
            ->orderByDesc('workflow_created_at')->orderByDesc('process_instance_id')->get();
        $filtered = [];

        foreach ($records as $record) {
            $workflow = $this->decode((string) $record->workflow_payload, []);
            if ((string) ($workflow['processCode'] ?? '') !== self::PROCESS_CODE) {
                continue;
            }
            if (($filters['process_instance_id'] ?? '') !== ''
                && ! str_contains((string) ($workflow['processInstanceId'] ?? ''), (string) $filters['process_instance_id'])
                && ! str_contains((string) ($workflow['businessId'] ?? ''), (string) $filters['process_instance_id'])) {
                continue;
            }
            if (! $this->matchesWorkflowFilters($workflow, $filters)) {
                continue;
            }

            $scheme = $this->decode((string) $record->scheme_payload, []);
            $forms = $this->formFields($scheme);
            foreach ($this->detailRows($forms['应付明细'] ?? []) as $detail) {
                $type = trim((string) ($detail['类型'] ?? ''));
                $purpose = trim((string) ($detail['用途'] ?? ''));
                if ($type !== '快递运费' || ! str_contains($purpose, '仓') || ! str_contains($purpose, '车费')) {
                    continue;
                }

                $filtered[] = [
                    'process_instance_id' => (string) ($workflow['processInstanceId'] ?? $record->process_instance_id),
                    'workflow' => $workflow,
                    'fields' => $forms,
                    'detail' => $detail,
                    'tasks' => $this->decode((string) ($record->task_payload ?? '[]'), []),
                ];
            }
        }

        $total = count($filtered);
        $data = array_slice($filtered, ($page - 1) * $perPage, $perPage);

        return [
            'data' => $data,
            'total' => $total,
            'status' => (string) ($state->status ?? 'unknown'),
            'last_synced_at' => $state->last_succeeded_at ? (string) $state->last_succeeded_at : null,
        ];
    }

    /** @param array<string,mixed> $workflow @param array<string,mixed> $filters */
    private function matchesWorkflowFilters(array $workflow, array $filters): bool
    {
        $createdFrom = trim((string) ($filters['created_from'] ?? ''));
        if ($createdFrom !== '') {
            $createdAt = $this->workflowDate($workflow['createAt'] ?? null);
            if ($createdAt === null || $createdAt < $createdFrom) {
                return false;
            }
        }

        $finishedTo = trim((string) ($filters['finished_to'] ?? ''));
        if ($finishedTo !== '') {
            $finishTime = $this->workflowDate($workflow['finishTime'] ?? null);
            if ($finishTime === null || $finishTime > $finishedTo) {
                return false;
            }
        }

        if (! DingPayableWorkflowStatus::matchesFilter(
            $workflow,
            (string) ($filters['status'] ?? ''),
        )) {
            return false;
        }

        return true;
    }

    private function workflowDate(mixed $value): ?string
    {
        $date = substr(trim((string) ($value ?? '')), 0, 10);

        return preg_match('/^\d{4}-\d{2}-\d{2}$/', $date) === 1 ? $date : null;
    }

    /** @return array<string,mixed> */
    private function formFields(array $rows): array
    {
        $fields = [];
        foreach ($rows as $row) {
            if (! is_array($row)) {
                continue;
            }
            $name = trim((string) ($row['name'] ?? ''));
            if ($name === '') {
                continue;
            }
            $value = $this->decode((string) ($row['value'] ?? ''), $row['value'] ?? null);
            $fields[$name] = $value;
        }
        return $fields;
    }

    /** @return list<array<string,mixed>> */
    private function detailRows(mixed $value): array
    {
        if (! is_array($value)) {
            return [];
        }
        $details = [];
        foreach ($value as $row) {
            if (! is_array($row) || ! isset($row['rowValue']) || ! is_array($row['rowValue'])) {
                continue;
            }
            $detail = [];
            foreach ($row['rowValue'] as $field) {
                if (! is_array($field) || ! isset($field['label'])) {
                    continue;
                }
                $detail[(string) $field['label']] = $this->scalarValue($field['value'] ?? null);
            }
            if ($detail !== []) {
                $details[] = $detail;
            }
        }
        return $details;
    }

    private function scalarValue(mixed $value): mixed
    {
        if (is_scalar($value) || $value === null) {
            return $value;
        }
        return json_encode($value, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    }

    private function decode(string $json, mixed $fallback): mixed
    {
        if ($json === '') {
            return $fallback;
        }
        $decoded = json_decode($json, true);
        return json_last_error() === JSON_ERROR_NONE ? $decoded : $fallback;
    }
}