<?php

namespace App\Business;

use App\Models\Business\CourierSurchargeAuditLog;
use Illuminate\Database\QueryException;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Schema;

/**
 * 快递附加费维护审计日志的固定入口。
 *
 * 日志只保存当前公司、操作人和报价/类型的安全字段快照，不保存密码、
 * Token、连接串或原始请求内容。
 */
class CourierSurchargeAuditLogRepository
{
    /** @var array<string,string> */
    private const FIELD_LABELS = [
        'courier' => '快递名称',
        'scope' => '快递归属',
        'reconciler' => '对账人',
        'supplier' => '供应商',
        'types' => '附加费类型',
        'mode' => '结算方式',
        'standard' => '计价标准',
        'condition' => '生效条件',
        'effective_at' => '生效日期',
        'remark' => '备注',
        'status' => '状态',
        'name' => '类型名称',
    ];

    /** @var array<string,string> */
    private const ACTION_LABELS = [
        CourierSurchargeAuditLog::ACTION_CREATED => '新增',
        CourierSurchargeAuditLog::ACTION_UPDATED => '更改',
        CourierSurchargeAuditLog::ACTION_ACTIVATED => '启用',
        CourierSurchargeAuditLog::ACTION_DEACTIVATED => '停用',
    ];

    /** @var array<string,string> */
    private const TARGET_LABELS = [
        CourierSurchargeAuditLog::TARGET_QUOTE => '报价规则',
        CourierSurchargeAuditLog::TARGET_TYPE => '附加费类型',
    ];

    public function ready(): bool
    {
        try {
            return Schema::hasTable((new CourierSurchargeAuditLog())->getTable());
        } catch (QueryException) {
            return false;
        }
    }

    /** @param array<string,mixed> $changes */
    public function record(
        string $action,
        string $targetType,
        ?int $targetId,
        string $targetLabel,
        array $changes,
        int $actorId,
    ): CourierSurchargeAuditLog {
        abort_unless($this->ready(), 503, '附加费操作日志数据表尚未完成迁移。');
        abort_unless(array_key_exists($action, self::ACTION_LABELS), 422, '附加费日志动作不合法。');
        abort_unless(array_key_exists($targetType, self::TARGET_LABELS), 422, '附加费日志对象不合法。');

        return CourierSurchargeAuditLog::query()->create([
            'company_id' => company_id(),
            'actor_id' => $actorId ?: null,
            'action' => $action,
            'target_type' => $targetType,
            'target_id' => $targetId,
            'target_label' => mb_substr(trim($targetLabel), 0, 191),
            'changes' => $changes,
        ]);
    }

    /**
     * @return Collection<int,array<string,mixed>>
     */
    public function recent(int $limit = 50): Collection
    {
        if (! $this->ready()) {
            return collect();
        }

        try {
            return CourierSurchargeAuditLog::query()
                ->with('actor')
                ->orderByDesc('id')
                ->limit(max(1, min($limit, 200)))
                ->get()
                ->map(fn (CourierSurchargeAuditLog $log): array => [
                    'id' => $log->id,
                    'occurred_at' => optional($log->created_at)->format('Y-m-d H:i:s') ?: '',
                    'actor_name' => $log->actor?->name ?: '系统',
                    'action' => $log->action,
                    'action_label' => self::ACTION_LABELS[$log->action] ?? $log->action,
                    'target_type' => $log->target_type,
                    'target_id' => $log->target_id,
                    'target_type_label' => self::TARGET_LABELS[$log->target_type] ?? $log->target_type,
                    'target_label' => $log->target_label,
                    'changes_label' => $this->changesLabel($log),
                ])
                ->values();
        } catch (QueryException) {
            return collect();
        }
    }

    private function changesLabel(CourierSurchargeAuditLog $log): string
    {
        $changes = (array) $log->changes;
        if ($log->action === CourierSurchargeAuditLog::ACTION_CREATED) {
            return '新增记录';
        }

        if (in_array($log->action, [CourierSurchargeAuditLog::ACTION_ACTIVATED, CourierSurchargeAuditLog::ACTION_DEACTIVATED], true)) {
            $before = data_get($changes, 'before.status');
            $after = data_get($changes, 'after.status');
            return sprintf('状态：%s → %s', $before ?: '—', $after ?: '—');
        }

        $before = (array) ($changes['before'] ?? []);
        $after = (array) ($changes['after'] ?? []);
        $parts = [];
        foreach (array_unique(array_merge(array_keys($before), array_keys($after))) as $field) {
            $old = $this->valueLabel($before[$field] ?? null);
            $new = $this->valueLabel($after[$field] ?? null);
            if ($old !== $new) {
                $parts[] = sprintf('%s：%s → %s', self::FIELD_LABELS[$field] ?? $field, $old, $new);
            }
        }

        return $parts === [] ? '未改变字段' : implode('；', $parts);
    }

    private function valueLabel(mixed $value): string
    {
        if (is_array($value)) {
            return implode('、', array_map(static fn (mixed $item): string => (string) $item, $value));
        }

        $value = trim((string) $value);

        return $value === '' ? '—' : $value;
    }
}