<?php

namespace App\Module\Mex\Logic;

use App\Module\Mex\Dto\MexPriceAdjustmentDto;
use App\Module\Mex\Enums\PriceAdjustmentType;
use App\Module\Mex\Models\MexPriceAdjustment;
use App\Module\Mex\Models\MexPriceConfig;
use Illuminate\Support\Collection;

/**
 * 农贸市场价格调整记录逻辑层
 */
class MexPriceAdjustmentLogic
{
    /**
     * 记录价格配置调整
     */
    public function recordPriceConfigAdjustment(
        MexPriceConfig $oldConfig,
        MexPriceConfig $newConfig,
        int $adminUserId,
        ?string $adjustmentReason = null,
        ?string $marketImpactNote = null
    ): MexPriceAdjustmentDto {
        // 确定调整类型
        $adjustmentType = $this->determineAdjustmentType($oldConfig, $newConfig);
        
        $adjustment = MexPriceAdjustment::create([
            'price_config_id' => $newConfig->id,
            'item_id' => $newConfig->item_id,
            'admin_user_id' => $adminUserId,
            'adjustment_type' => $adjustmentType,
            'old_min_price' => $oldConfig->min_price,
            'new_min_price' => $newConfig->min_price,
            'old_max_price' => $oldConfig->max_price,
            'new_max_price' => $newConfig->max_price,
            'old_protection_threshold' => $oldConfig->protection_threshold,
            'new_protection_threshold' => $newConfig->protection_threshold,
            'old_is_enabled' => $oldConfig->is_enabled,
            'new_is_enabled' => $newConfig->is_enabled,
            'adjustment_reason' => $adjustmentReason,
            'market_impact_note' => $marketImpactNote,
        ]);

        return MexPriceAdjustmentDto::fromModel($adjustment);
    }

    /**
     * 获取商品的价格调整历史
     */
    public function getItemAdjustmentHistory(int $itemId, int $limit = 50): Collection
    {
        $adjustments = MexPriceAdjustment::where('item_id', $itemId)
            ->with(['priceConfig', 'item'])
            ->orderBy('created_at', 'desc')
            ->limit($limit)
            ->get();

        return $adjustments->map(fn($adjustment) => MexPriceAdjustmentDto::fromModel($adjustment));
    }

    /**
     * 获取管理员的调整操作记录
     */
    public function getAdminAdjustmentHistory(int $adminUserId, int $limit = 50): Collection
    {
        $adjustments = MexPriceAdjustment::where('admin_user_id', $adminUserId)
            ->with(['priceConfig', 'item'])
            ->orderBy('created_at', 'desc')
            ->limit($limit)
            ->get();

        return $adjustments->map(fn($adjustment) => MexPriceAdjustmentDto::fromModel($adjustment));
    }

    /**
     * 获取指定时间范围内的调整记录
     */
    public function getAdjustmentsByDateRange(
        string $startDate,
        string $endDate,
        ?int $itemId = null,
        ?int $adminUserId = null
    ): Collection {
        $query = MexPriceAdjustment::whereBetween('created_at', [$startDate, $endDate])
            ->with(['priceConfig', 'item']);

        if ($itemId) {
            $query->where('item_id', $itemId);
        }

        if ($adminUserId) {
            $query->where('admin_user_id', $adminUserId);
        }

        $adjustments = $query->orderBy('created_at', 'desc')->get();

        return $adjustments->map(fn($adjustment) => MexPriceAdjustmentDto::fromModel($adjustment));
    }

    /**
     * 获取调整统计信息
     */
    public function getAdjustmentStatistics(string $startDate, string $endDate): array
    {
        $adjustments = MexPriceAdjustment::whereBetween('created_at', [$startDate, $endDate])->get();

        $stats = [
            'total_adjustments' => $adjustments->count(),
            'by_type' => [],
            'by_admin' => [],
            'by_item' => [],
        ];

        // 按调整类型统计
        $stats['by_type'] = $adjustments->groupBy('adjustment_type')
            ->map(fn($group) => $group->count())
            ->toArray();

        // 按管理员统计
        $stats['by_admin'] = $adjustments->groupBy('admin_user_id')
            ->map(fn($group) => $group->count())
            ->toArray();

        // 按商品统计
        $stats['by_item'] = $adjustments->groupBy('item_id')
            ->map(fn($group) => $group->count())
            ->toArray();

        return $stats;
    }

    /**
     * 确定调整类型
     */
    private function determineAdjustmentType(MexPriceConfig $oldConfig, MexPriceConfig $newConfig): PriceAdjustmentType
    {
        $changes = [];
        
        if ($oldConfig->min_price != $newConfig->min_price) {
            $changes[] = PriceAdjustmentType::MIN_PRICE;
        }
        
        if ($oldConfig->max_price != $newConfig->max_price) {
            $changes[] = PriceAdjustmentType::MAX_PRICE;
        }
        
        if ($oldConfig->protection_threshold != $newConfig->protection_threshold) {
            $changes[] = PriceAdjustmentType::PROTECTION_THRESHOLD;
        }
        
        if ($oldConfig->is_enabled != $newConfig->is_enabled) {
            $changes[] = PriceAdjustmentType::STATUS;
        }

        // 如果有多个变化，返回批量调整
        if (count($changes) > 1) {
            return PriceAdjustmentType::BATCH;
        }

        // 如果只有一个变化，返回对应的类型
        return $changes[0] ?? PriceAdjustmentType::BATCH;
    }
}