<?php

namespace App\Support;

use App\Models\Venue;

/**
 * 场馆审核对比：快照（已通过）与待审内容的字段差异。
 */
final class VenueAuditDiff
{
    /** @var array<string, string> */
    public const FIELD_LABELS = [
        'name' => '场馆名称',
        'venue_type' => '主题',
        'venue_types' => '主题（多选）',
        'unit_name' => '所属单位',
        'district' => '行政区',
        'ticket_type' => '门票类型',
        'appointment_type' => '预约类型',
        'booking_mode' => '预约模式',
        'open_mode' => '开放模式',
        'open_time' => '开放时间',
        'reservation_notice' => '预约须知',
        'ticket_content' => '门票说明',
        'booking_method' => '预约方式',
        'visit_form' => '参观形式',
        'consultation_hours' => '咨询预约时间',
        'booking_qr_media' => '预约二维码',
        'address' => '场馆地址',
        'contact_phone' => '联系电话',
        'lat' => '纬度',
        'lng' => '经度',
        'cover_image' => '封面图',
        'gallery_media' => '轮播图与视频',
        'detail_html' => '场馆详情',
        'live_people_count' => '实时在馆人数',
        'sort' => '排序',
        'is_active' => '上架',
        'is_included_in_stats' => '纳入人数统计',
    ];

    /**
     * @return list<array{field: string, label: string, before: string, after: string}>
     */
    public static function diff(Venue $venue): array
    {
        $snapshot = $venue->last_approved_snapshot;
        if (! is_array($snapshot) || $snapshot === []) {
            return [];
        }

        $out = [];
        foreach (Venue::SNAPSHOT_KEYS as $key) {
            $before = self::normalizeValue($snapshot[$key] ?? null);
            $after = self::normalizeValue($venue->getAttribute($key));
            if ($before === $after) {
                continue;
            }
            $out[] = [
                'field' => $key,
                'label' => self::FIELD_LABELS[$key] ?? $key,
                'before' => $before,
                'after' => $after,
            ];
        }

        return $out;
    }

    private static function normalizeValue(mixed $v): string
    {
        if ($v === null) {
            return '';
        }
        if (is_bool($v)) {
            return $v ? '是' : '否';
        }
        if (is_array($v)) {
            if ($v === []) {
                return '';
            }
            $encoded = json_encode($v, JSON_UNESCAPED_UNICODE);

            return is_string($encoded) ? $encoded : '';
        }

        return trim((string) $v);
    }
}