using System;
using System.IO;
using System.Threading.Tasks;
using Moq;
using Serilog;
using Xunit;
using XplorePlane.Models;
using XplorePlane.Services;
using XplorePlane.Services.AppState;
using XplorePlane.Services.Recipe;

namespace XplorePlane.Tests.Services
{
    /// <summary>
    /// RecipeService 单元测试。
    /// 验证配方创建、步骤记录、文件加载错误处理和名称校验。
    /// </summary>
    public class RecipeServiceTests
    {
        private readonly Mock<IAppStateService> _mockAppState;
        private readonly Mock<IPipelineExecutionService> _mockPipeline;
        private readonly Mock<ILogger> _mockLogger;
        private readonly RecipeService _service;

        public RecipeServiceTests()
        {
            _mockAppState = new Mock<IAppStateService>();
            _mockPipeline = new Mock<IPipelineExecutionService>();
            _mockLogger = new Mock<ILogger>();

            // Setup default state returns
            _mockAppState.Setup(s => s.MotionState).Returns(MotionState.Default);
            _mockAppState.Setup(s => s.RaySourceState).Returns(RaySourceState.Default);
            _mockAppState.Setup(s => s.DetectorState).Returns(DetectorState.Default);

            _service = new RecipeService(
                _mockAppState.Object,
                _mockPipeline.Object,
                _mockLogger.Object);
        }

        // ── CreateRecipe 验证 ──

        [Fact]
        public void CreateRecipe_ValidName_ReturnsEmptyRecipe()
        {
            var recipe = _service.CreateRecipe("TestRecipe");

            Assert.Equal("TestRecipe", recipe.Name);
            Assert.Empty(recipe.Steps);
            Assert.NotEqual(Guid.Empty, recipe.Id);
            Assert.True(recipe.CreatedAt <= DateTime.UtcNow);
            Assert.True(recipe.UpdatedAt <= DateTime.UtcNow);
        }

        [Fact]
        public void CreateRecipe_EmptyName_ThrowsArgumentException()
        {
            Assert.Throws<ArgumentException>(() => _service.CreateRecipe(string.Empty));
        }

        [Fact]
        public void CreateRecipe_NullName_ThrowsArgumentException()
        {
            Assert.Throws<ArgumentException>(() => _service.CreateRecipe(null!));
        }

        [Fact]
        public void CreateRecipe_WhitespaceName_ThrowsArgumentException()
        {
            Assert.Throws<ArgumentException>(() => _service.CreateRecipe("   "));
        }

        // ── RecordCurrentStep 验证 ──

        [Fact]
        public void RecordCurrentStep_CapturesCurrentState()
        {
            var motionState = new MotionState(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12);
            var raySourceState = new RaySourceState(true, 120.0, 80.0);
            var detectorState = new DetectorState(true, true, 30.0, "2048x2048");

            _mockAppState.Setup(s => s.MotionState).Returns(motionState);
            _mockAppState.Setup(s => s.RaySourceState).Returns(raySourceState);
            _mockAppState.Setup(s => s.DetectorState).Returns(detectorState);

            var recipe = _service.CreateRecipe("TestRecipe");
            var pipeline = new PipelineModel { Name = "TestPipeline" };

            var step = _service.RecordCurrentStep(recipe, pipeline);

            Assert.Equal(0, step.StepIndex);
            Assert.Same(motionState, step.MotionState);
            Assert.Same(raySourceState, step.RaySourceState);
            Assert.Same(detectorState, step.DetectorState);
            Assert.Same(pipeline, step.Pipeline);
        }

        // ── LoadAsync 错误处理 ──

        [Fact]
        public async Task LoadAsync_FileNotExists_ThrowsFileNotFoundException()
        {
            var nonExistentPath = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString() + ".json");

            await Assert.ThrowsAsync<FileNotFoundException>(
                () => _service.LoadAsync(nonExistentPath));
        }

        [Fact]
        public async Task LoadAsync_InvalidJson_ThrowsInvalidDataException()
        {
            var tempFile = Path.GetTempFileName();
            try
            {
                await File.WriteAllTextAsync(tempFile, "{ this is not valid json !!! }");

                await Assert.ThrowsAsync<InvalidDataException>(
                    () => _service.LoadAsync(tempFile));
            }
            finally
            {
                if (File.Exists(tempFile))
                    File.Delete(tempFile);
            }
        }
    }
}