1、订单增加了根据优惠券计算价格，2、订单提交完善，增加销量统计和资金流水；

app/Http/Controllers/Api/OrderController.php

@@ -4,8 +4,10 @@ namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller;
 use App\Models\AgentProduct;
+use App\Models\UserMoneyLog;
 use App\Models\Order;
 use Illuminate\Http\Request;
+use Illuminate\Support\Facades\DB;
 
 /**
  * 订单
@@ -64,54 +66,106 @@ class OrderController extends Controller
 			'num.min' => '购买数量输入错误',
 		]);
 
-		$product = AgentProduct::where('id', $formData['id'])->with('product')->first();
-		if (!$product) {
+		$agent_product = AgentProduct::query()
+			->where('id', $formData['id'])
+			->with('coupon')
+			->with('product')
+			->first();
+		if (!$agent_product || !$agent_product->product) {
 			$this->error('产品不存在');
 		}
 
-		$price = $product->price; //TODO 1、成交价格还要扣除优惠券；2、产品表加库存；3、生成资金流水；4、开启事务；
-		Order::create([
-			'user_id' => $this->user_id,
-			'order_no' => $this->getOrderNo(),
-			'num' => $formData['num'],
-			'price' => $price,
-			'name' => $formData['name'],
-			'mobile' => $formData['mobile'],
-			'title' => $product->product->title,
-			'agent_product_id' => $product->id,
-			'product_id' => $product->product_id,
-			'status' => 0,
-			'pay_type' => $formData['pay_type'],
-		]);
+		DB::beginTransaction();
+		try {
+			$price = $this->calc($agent_product, $formData['num']);
+			$title = $agent_product->product->title; //产品标题
+			//增加销量
+			$agent_product->increment('sale', $formData['num']); //代理商产品表销量
+			$agent_product->product->increment('sale', $formData['num']); //供应商产品表
+
+			// 存入订单表
+			$order = Order::query()->create([
+				'user_id' => $this->user_id,
+				'order_no' => $this->getOrderNo(),
+				'num' => $formData['num'],
+				'price' => $price,
+				'name' => $formData['name'],
+				'mobile' => $formData['mobile'],
+				'title' => $title,
+				'agent_product_id' => $agent_product->id,
+				'product_id' => $agent_product->product_id,
+				'status' => 0,
+				'pay_type' => $formData['pay_type'],
+			]);
+
+			//资金流水
+			UserMoneyLog::query()->create([
+				'user_id' => $this->user_id,
+				'agent_id' => $this->agent_id,
+				'money' => -$price,
+				'order_id' => $order->id,
+				'type' => 1,
+				'desc' => '购买产品：' . $title,
+				'created_at' => time(), //已关闭模型自动写入时间
+			]);
+
+			DB::commit();
+		} catch (\Exception $e) {
+			DB::rollBack();
+			return $e->getMessage();
+		}
 		return $this->success();
 	}
 
 	//获取应付金额
 	public function getPrice(Request $request)
 	{
-		$id = $request->input('id');
-		if (!$id || !ctype_digit($id)) {
-			return $this->error('未指定ID');
-		}
+		$id = (int)$request->input('id');
 
 		$num = (float)$request->input('num');
 		if (!$num || $num < 1) {
 			return $this->error('未指定产品数量');
 		}
 
-		return $this->success(['price' => $this->calc($id, $num)]);
+		$agent_product = AgentProduct::query()
+			->with(['coupon' => fn($query) => $query->select('*')])
+			->find($id);
+		$final_price = $this->calc($agent_product, $num);
+		return $this->success(['price' => $final_price]);
 	}
 
-	//计算价格
-	private function calc($agent_id, $num)
+	/**
+	 * 计算最终价格（扣除优惠券之后的价格）
+	 * @param $agent_product
+	 * @param $num
+	 * @return float
+	 */
+	private function calc($agent_product, $num)
 	{
-		return 2888.99; // TODO 此处需要详细计算，并扣除优惠价等之后的价格
+		$total_price = $agent_product->price * $num;
+		//没有任何优惠券时直接返回最终价
+		if ($agent_product->coupon->isEmpty()) {
+			return $total_price;
+		}
+
+		$coupon = $agent_product->coupon->toArray();
+		foreach ($coupon as $v) {
+			if ($v['type'] == 1 && !empty($v['detail']['full']) && !empty($v['detail']['reduction'])) { //满减
+				if ($total_price >= $v['detail']['full']) {
+					$total_price -= $v['detail']['reduction'];
+				}
+			} else if ($v['type'] == 2 && !empty($v['detail']['discount'])) { //打折
+				$total_price *= $v['detail']['discount'];
+			}
+		}
+		return round($total_price, 2);
 	}
 
 	// 生成订单号
 	private function getOrderNo()
 	{
 		list($micro, $sec) = explode(' ', microtime());
-		return date('YmdHis', $sec) . str_pad(floor($micro * 1000000), 6, 0, STR_PAD_LEFT) . mt_rand(100, 999);
+		$micro = str_pad(floor($micro * 1000000), 6, 0, STR_PAD_LEFT);
+		return date('YmdHis', $sec) . $micro . mt_rand(100, 999);
 	}
 }