<?php

namespace Modules\EcommerceFinance\Services;

use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;

class AccessoryReshipCourierStore
{
    public const TABLE = 'business_accessory_reship_couriers';
    public const EVENTS = 'business_accessory_reship_config_events';

    public function query(int $companyId)
    {
        abort_unless($companyId > 0, 422, '缺少当前公司。');
        return DB::table(self::TABLE)->where('company_id', $companyId);
    }

    public function activeRates(int $companyId): array
    {
        $result = [];
        foreach ($this->query($companyId)->whereNull('deleted_at')->get() as $row) {
            $result[trim($row->courier_name)] = (array) $row;
        }
        return $result;
    }

    public function filtered(int $companyId, array $filters)
    {
        $query = $this->query($companyId);
        $status = $filters['deleted_status'] ?? 'active';
        if ($status === 'deleted') {
            $query->whereNotNull('deleted_at');
        } elseif ($status !== 'all') {
            $query->whereNull('deleted_at');
        }
        foreach (['courier_name', 'creator'] as $field) {
            if (($filters[$field] ?? '') !== '') {
                $query->where($field, 'like', '%' . addcslashes($filters[$field], '\\%_') . '%');
            }
        }
        if (($filters['created_from'] ?? '') !== '') {
            $query->whereRaw('COALESCE(source_created_at, created_at) >= ?', [$filters['created_from'] . ' 00:00:00']);
        }
        if (($filters['created_to'] ?? '') !== '') {
            $query->whereRaw('COALESCE(source_created_at, created_at) < ?', [Carbon::parse($filters['created_to'])->addDay()->format('Y-m-d') . ' 00:00:00']);
        }
        return $query->orderByRaw('COALESCE(source_created_at, created_at) DESC')->orderByDesc('id');
    }

    public function save(int $companyId, array $data, string $actor, ?int $id = null): int
    {
        return DB::transaction(function () use ($companyId, $data, $actor, $id): int {
            $before = $id === null ? null : $this->query($companyId)->where('id', $id)->whereNull('deleted_at')->lockForUpdate()->first();
            abort_if($id !== null && $before === null, 404);
            $this->assertIdentity($companyId, $data, $id);
            $time = $this->time();
            $values = ['courier_code' => trim($data['courier_code']), 'courier_name' => trim($data['courier_name']), 'rate_basis_points' => (int) $data['rate_basis_points'], 'updated_at' => $time];
            if ($id === null) {
                $id = DB::table(self::TABLE)->insertGetId($values + ['company_id' => $companyId, 'creator' => $actor, 'source_created_at' => null, 'created_at' => $time]);
            } else {
                $this->query($companyId)->where('id', $id)->update($values);
            }
            $this->event($companyId, $id, $actor, $before ? 'update' : 'create', $before ? '修改快递扣款配置' : '新增快递扣款配置', ['before' => $before, 'after' => $values]);
            return $id;
        });
    }

    public function changeDeleted(int $companyId, int $id, bool $deleted, string $actor): void
    {
        DB::transaction(function () use ($companyId, $id, $deleted, $actor): void {
            $row = $this->query($companyId)->where('id', $id)->lockForUpdate()->first();
            abort_if($row === null, 404);
            if (($row->deleted_at !== null) === $deleted) {
                return;
            }
            $this->query($companyId)->where('id', $id)->update(['deleted_at' => $deleted ? $this->time() : null, 'updated_at' => $this->time()]);
            $this->event($companyId, $id, $actor, $deleted ? 'delete' : 'restore', ($deleted ? '删除' : '恢复') . '快递扣款配置', ['courier_code' => $row->courier_code, 'courier_name' => $row->courier_name]);
        });
    }

    /** 整批事务：重复导入相同配置跳过，冲突不覆盖、删除状态不自动恢复。 */
    public function import(int $companyId, array $rows, string $actor, string $sourceHash): array
    {
        return DB::transaction(function () use ($companyId, $rows, $actor, $sourceHash): array {
            $added = 0;
            $skipped = 0;
            foreach ($rows as $row) {
                $existing = $this->query($companyId)->where('courier_code', $row['courier_code'])->lockForUpdate()->first();
                if ($existing !== null) {
                    if ($existing->courier_name !== $row['courier_name'] || (int) $existing->rate_basis_points !== $row['rate_basis_points'] || $existing->deleted_at !== null) {
                        throw ValidationException::withMessages(['file' => '快递代码 ' . $row['courier_code'] . ' 已存在不同配置或已删除，整批未导入，请核对后重试。']);
                    }
                    $skipped++;
                    continue;
                }
                $this->assertIdentity($companyId, $row);
                DB::table(self::TABLE)->insert($row + ['company_id' => $companyId, 'created_at' => $this->time(), 'updated_at' => $this->time()]);
                $added++;
            }
            $this->event($companyId, null, $actor, 'import', "导入快递配置：新增{$added}条，重复跳过{$skipped}条", ['added' => $added, 'skipped' => $skipped, 'source_sha256' => $sourceHash]);
            return compact('added', 'skipped');
        });
    }

    private function assertIdentity(int $companyId, array $data, ?int $exceptId = null): void
    {
        $query = $this->query($companyId)->where(function ($query) use ($data): void {
            $query->where('courier_code', trim($data['courier_code']))->orWhere('courier_name', trim($data['courier_name']));
        });
        if ($exceptId !== null) {
            $query->where('id', '<>', $exceptId);
        }
        if ($query->exists()) {
            throw ValidationException::withMessages(['courier_name' => '快递代码或名称已存在（含已删除配置），请编辑或恢复原配置。']);
        }
    }

    private function event(int $companyId, ?int $id, string $actor, string $action, string $description, array $details): void
    {
        DB::table(self::EVENTS)->insert(['company_id' => $companyId, 'config_id' => $id, 'actor' => $actor, 'action' => $action, 'description' => $description, 'details' => json_encode($details, JSON_UNESCAPED_UNICODE | JSON_THROW_ON_ERROR), 'created_at' => $this->time()]);
    }

    private function time(): string
    {
        return Carbon::now(config('app.platform_timezone', 'Asia/Shanghai'))->format('Y-m-d H:i:s');
    }
}