<?php

namespace Modules\EcommerceFinance\Repositories;

use Illuminate\Database\ConnectionInterface;
use Illuminate\Support\Carbon;
use Modules\EcommerceFinance\Repositories\GenericBusinessMirrorRepository;

class DataWarningMirrorRepository
{
    private readonly ConnectionInterface $connection;

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

    public function ready(): bool
    {
        return $this->connection->getSchemaBuilder()->hasTable('business_data_warnings');
    }

    /**
     * 生成或更新一条预警。同 warning_key 重复触发时只更新风险描述和影响，
     * 保留首次触发时间、责任人指派和处理留痕。
     *
     * @param array<string,mixed> $warning
     */
    public function upsert(array $warning): void
    {
        $key = (string) $warning['warning_key'];
        $existing = $this->connection->table('business_data_warnings')->where('warning_key', $key)->first();

        if ($existing !== null) {
            $this->connection->table('business_data_warnings')->where('warning_key', $key)->update([
                'warning_type' => $warning['warning_type'],
                'risk_level' => $warning['risk_level'],
                'related_object' => $warning['related_object'] ?? null,
                'risk_description' => $warning['risk_description'] ?? null,
                'evidence' => $warning['evidence'] ?? null,
                'impact' => $warning['impact'] ?? null,
                'trigger_rule' => $warning['trigger_rule'] ?? null,
                'updated_at' => now(),
            ]);

            return;
        }

        $this->connection->table('business_data_warnings')->insert([
            'warning_key' => $key,
            'warning_number' => $this->nextWarningNumber(),
            'warning_type' => $warning['warning_type'],
            'risk_level' => $warning['risk_level'],
            'related_object' => $warning['related_object'] ?? null,
            'risk_description' => $warning['risk_description'] ?? null,
            'evidence' => $warning['evidence'] ?? null,
            'impact' => $warning['impact'] ?? null,
            'trigger_rule' => $warning['trigger_rule'] ?? null,
            'triggered_at' => now(),
            'responsible_person' => $warning['responsible_person'] ?? null,
            'due_at' => $warning['due_at'] ?? null,
            'review_status' => 'pending',
            'created_at' => now(),
            'updated_at' => now(),
        ]);
    }

    /**
     * 预警页面数据。按触发时间倒序，等待复审的排在前面。
     *
     * @param array<string,string> $filters
     * @return array{data: array<int,array<string,mixed>>, total: int, pending: int}
     */
    public function paginate(int $page, int $perPage, array $filters = []): array
    {
        if (! $this->ready()) {
            return ['data' => [], 'total' => 0, 'pending' => 0];
        }

        $query = $this->connection->table('business_data_warnings');

        foreach (['warning_type', 'risk_level', 'review_status'] as $exact) {
            $value = trim((string) ($filters[$exact] ?? ''));
            if ($value !== '') {
                $query->where($exact, '=', $value);
            }
        }

        foreach (['warning_number', 'related_object', 'responsible_person'] as $text) {
            $value = trim((string) ($filters[$text] ?? ''));
            if ($value !== '') {
                $query->where($text, 'like', '%' . addcslashes($value, '%_\\') . '%');
            }
        }

        $total = (clone $query)->count();
        $pending = (clone $query)->where('review_status', '=', 'pending')->count();

        $rows = $query
            ->orderByRaw("case when review_status = 'pending' then 0 else 1 end")
            ->orderByDesc('triggered_at')
            ->orderByDesc('id')
            ->forPage(max($page, 1), $perPage)
            ->get()
            ->map(static function (object $row): array {
                $row = (array) $row;
                $row['triggered_at'] = $row['triggered_at'] !== null
                    ? Carbon::parse($row['triggered_at'])->format('Y-m-d H:i')
                    : null;
                $row['reviewed_at'] = $row['reviewed_at'] !== null
                    ? Carbon::parse($row['reviewed_at'])->format('Y-m-d H:i')
                    : null;
                $row['due_at'] = $row['due_at'] !== null
                    ? Carbon::parse($row['due_at'])->format('Y-m-d')
                    : null;
                $row['review_status_label'] = match ((string) $row['review_status']) {
                    'pending' => '待复审',
                    'confirmed' => '已确认',
                    'rejected' => '已驳回',
                    default => (string) $row['review_status'],
                };

                return $row;
            })
            ->all();

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

    /** @param array<int,array<string,mixed>> $warnings */
    public function upsertMany(array $warnings): int
    {
        $count = 0;
        foreach ($warnings as $warning) {
            $this->upsert($warning);
            $count++;
        }

        return $count;
    }

    public function find(int $id): ?array
    {
        if (! $this->ready()) {
            return null;
        }

        $row = $this->connection->table('business_data_warnings')->where('id', $id)->first();

        return $row === null ? null : (array) $row;
    }

    /**
     * 人工复审：确认时保持系统按爬虫生成的结果，驳回时记录依据由后续
     * 期间合并任务改回流程数据。
     */
    public function review(int $id, string $status, string $reviewer, ?string $note, ?string $responsiblePerson = null): bool
    {
        if (! $this->ready()) {
            return false;
        }

        $update = [
            'review_status' => $status,
            'reviewer' => $reviewer,
            'reviewed_at' => now(),
            'review_note' => $note,
            'updated_at' => now(),
        ];
        if ($responsiblePerson !== null && trim($responsiblePerson) !== '') {
            $update['responsible_person'] = trim($responsiblePerson);
        }

        return $this->connection->table('business_data_warnings')->where('id', $id)->update($update) > 0;
    }

    private function nextWarningNumber(): string
    {
        $date = now()->format('Ymd');
        $prefix = 'WARN-' . $date . '-';
        $latest = $this->connection->table('business_data_warnings')
            ->where('warning_number', 'like', $prefix . '%')
            ->orderByDesc('warning_number')
            ->value('warning_number');
        $sequence = $latest === null ? 0 : (int) substr((string) $latest, -3);

        return $prefix . str_pad((string) ($sequence + 1), 3, '0', STR_PAD_LEFT);
    }
}