From 71ebfcf4bee42b279c74490aaa4d86b96544ca1a Mon Sep 17 00:00:00 2001
From: franc <franc@FRANCESCOSBUSIN>
Date: Tue, 15 Apr 2025 16:11:07 +0200
Subject: [PATCH] Implement the Sorting Logic

---
 .../Instruction/IInstructionService.cs        |  9 ++++
 .../Instruction/InstructionService.cs         | 54 +++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 Francesco.Recipes.World/Services/Instruction/IInstructionService.cs
 create mode 100644 Francesco.Recipes.World/Services/Instruction/InstructionService.cs

diff --git a/Francesco.Recipes.World/Services/Instruction/IInstructionService.cs b/Francesco.Recipes.World/Services/Instruction/IInstructionService.cs
new file mode 100644
index 0000000..fa514a1
--- /dev/null
+++ b/Francesco.Recipes.World/Services/Instruction/IInstructionService.cs
@@ -0,0 +1,9 @@
+namespace Francesco.Recipes.World.Services.Instruction
+{
+    public interface IInstructionService
+    {
+        Task MoveInstructionUpAsync(Guid instructionId);
+
+        Task MoveInstructionDownAsync(Guid instructionId);
+    }
+}
diff --git a/Francesco.Recipes.World/Services/Instruction/InstructionService.cs b/Francesco.Recipes.World/Services/Instruction/InstructionService.cs
new file mode 100644
index 0000000..5015426
--- /dev/null
+++ b/Francesco.Recipes.World/Services/Instruction/InstructionService.cs
@@ -0,0 +1,54 @@
+using Francesco.Recipes.World.Repositories.Instruction;
+
+namespace Francesco.Recipes.World.Services.Instruction
+{
+    public class InstructionService : IInstructionService
+    {
+        private readonly IInstructionRepository _instructionRepository;
+
+        public InstructionService(IInstructionRepository instructionRepository)
+        {
+            _instructionRepository = instructionRepository;
+        }
+
+        public async Task MoveInstructionDownAsync(Guid instructionId)
+        {
+            var instruction = await _instructionRepository.GetInstructionWithRecipeAsync(instructionId);
+
+            var instructions = await _instructionRepository.GetInstructionsByRecipeIdAsync(instruction.Recipe.Id);
+
+            var maxStep = instructions.Max(i => i.Number);
+
+            if (instruction.Number >= maxStep)
+            {
+                return;
+            }
+
+            var neighbor = instructions.FirstOrDefault(i => i.Number == instruction.Number + 1);
+
+            if (neighbor != null)
+            {
+                await _instructionRepository.SwapInstructionOrderAsync(instruction, neighbor);
+            }
+        }
+
+        public async Task MoveInstructionUpAsync(Guid instructionId)
+        {
+            var instruction = await _instructionRepository.GetInstructionWithRecipeAsync(instructionId);
+
+            if (instruction.Number == 1)
+            {
+                return;
+            }
+
+            var instructions = await _instructionRepository.GetInstructionsByRecipeIdAsync(instruction.Recipe.Id);
+
+            var neighbor = instructions.FirstOrDefault(i => i.Number == instruction.Number - 1);
+
+            if (neighbor != null)
+            {
+                await _instructionRepository.SwapInstructionOrderAsync(instruction, neighbor);
+            }
+        }
+    }
+}