using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using FluentAssertions;
using Microsoft.AspNetCore.Mvc;
using Moq;
using Xunit;
using Haoliang.Api.Controllers;
using Haoliang.Core.Services;

namespace Haoliang.Tests.Controllers
{
    public class StatisticsControllerTests
    {
        private readonly Mock<IProductionStatisticsService> _statisticsService = new Mock<IProductionStatisticsService>();
        private readonly StatisticsController _controller;

        public StatisticsControllerTests()
        {
            _controller = new StatisticsController(_statisticsService.Object);
        }

        // 1. GetProductionTrends (4 tests: invalid device, invalid date range, success, exception)
        [Fact]
        public async Task GetProductionTrends_InvalidDeviceId_ReturnsBadRequest()
        {
            var result = await _controller.GetProductionTrends(0, DateTime.Today, DateTime.Today.AddDays(1));
            result.Result.Should().BeOfType<BadRequestObjectResult>();
        }

        [Fact]
        public async Task GetProductionTrends_InvalidDateRange_ReturnsBadRequest()
        {
            var result = await _controller.GetProductionTrends(1, DateTime.Today, DateTime.Today);
            result.Result.Should().BeOfType<BadRequestObjectResult>();
        }

        [Fact]
        public async Task GetProductionTrends_NotFound_Returns404()
        {
            _statisticsService.Setup(s => s.CalculateProductionTrendsAsync(It.IsAny<int>(), It.IsAny<DateTime>(), It.IsAny<DateTime>()))
                .ThrowsAsync(new KeyNotFoundException("not found"));
            var result = await _controller.GetProductionTrends(1, DateTime.Today.AddDays(-1), DateTime.Today);
            result.Result.Should().BeOfType<NotFoundObjectResult>();
        }

        [Fact]
        public async Task GetProductionTrends_WhenSuccess_ReturnsOk()
        {
            _statisticsService.Setup(s => s.CalculateProductionTrendsAsync(It.IsAny<int>(), It.IsAny<DateTime>(), It.IsAny<DateTime>()))
                .ReturnsAsync(new ProductionTrendAnalysis());
            var result = await _controller.GetProductionTrends(1, DateTime.Today.AddDays(-1), DateTime.Today);
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Fact]
        public async Task GetProductionTrends_WhenException_Returns500()
        {
            _statisticsService.Setup(s => s.CalculateProductionTrendsAsync(It.IsAny<int>(), It.IsAny<DateTime>(), It.IsAny<DateTime>()))
                .ThrowsAsync(new Exception("t"));
            var result = await _controller.GetProductionTrends(1, DateTime.Today.AddDays(-1), DateTime.Today);
            result.Result.Should().BeOfType<ObjectResult>().Which.StatusCode.Should().Be(500);
        }

        // 2. GetProductionReport (3 tests)
        [Fact]
        public async Task GetProductionReport_InvalidDateRange_ReturnsBadRequest()
        {
            var filter = new ReportFilter { StartDate = DateTime.Today, EndDate = DateTime.Today };
            var result = await _controller.GetProductionReport(filter);
            result.Result.Should().BeOfType<BadRequestObjectResult>();
        }

        [Fact]
        public async Task GetProductionReport_WhenSuccess_ReturnsOk()
        {
            var filter = new ReportFilter { StartDate = DateTime.Today.AddDays(-1), EndDate = DateTime.Today };
            _statisticsService.Setup(s => s.GenerateProductionReportAsync(It.IsAny<ReportFilter>()))
                .ReturnsAsync(new ProductionReport());
            var result = await _controller.GetProductionReport(filter);
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Fact]
        public async Task GetProductionReport_WhenException_Returns500()
        {
            var filter = new ReportFilter { StartDate = DateTime.Today.AddDays(-1), EndDate = DateTime.Today };
            _statisticsService.Setup(s => s.GenerateProductionReportAsync(It.IsAny<ReportFilter>()))
                .ThrowsAsync(new Exception("t"));
            var result = await _controller.GetProductionReport(filter);
            result.Result.Should().BeOfType<ObjectResult>().Which.StatusCode.Should().Be(500);
        }

        // 3. GetEfficiencyMetrics (3 tests)
        [Fact]
        public async Task GetEfficiencyMetrics_InvalidDateRange_ReturnsBadRequest()
        {
            var filter = new EfficiencyFilter { StartDate = DateTime.Today, EndDate = DateTime.Today };
            var result = await _controller.GetEfficiencyMetrics(filter);
            result.Result.Should().BeOfType<BadRequestObjectResult>();
        }

        [Fact]
        public async Task GetEfficiencyMetrics_WhenSuccess_ReturnsOk()
        {
            var filter = new EfficiencyFilter { StartDate = DateTime.Today.AddDays(-1), EndDate = DateTime.Today };
            _statisticsService.Setup(s => s.CalculateEfficiencyMetricsAsync(It.IsAny<EfficiencyFilter>()))
                .ReturnsAsync(new EfficiencyMetrics());
            var result = await _controller.GetEfficiencyMetrics(filter);
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Fact]
        public async Task GetEfficiencyMetrics_WhenException_Returns500()
        {
            var filter = new EfficiencyFilter { StartDate = DateTime.Today.AddDays(-1), EndDate = DateTime.Today };
            _statisticsService.Setup(s => s.CalculateEfficiencyMetricsAsync(It.IsAny<EfficiencyFilter>()))
                .ThrowsAsync(new Exception("t"));
            var result = await _controller.GetEfficiencyMetrics(filter);
            result.Result.Should().BeOfType<ObjectResult>().Which.StatusCode.Should().Be(500);
        }

        // 4. GetQualityAnalysis (3 tests)
        [Fact]
        public async Task GetQualityAnalysis_InvalidDateRange_ReturnsBadRequest()
        {
            var filter = new QualityFilter { StartDate = DateTime.Today, EndDate = DateTime.Today };
            var result = await _controller.GetQualityAnalysis(filter);
            result.Result.Should().BeOfType<BadRequestObjectResult>();
        }

        [Fact]
        public async Task GetQualityAnalysis_WhenSuccess_ReturnsOk()
        {
            var filter = new QualityFilter { StartDate = DateTime.Today.AddDays(-1), EndDate = DateTime.Today };
            _statisticsService.Setup(s => s.PerformQualityAnalysisAsync(It.IsAny<QualityFilter>()))
                .ReturnsAsync(new QualityAnalysis());
            var result = await _controller.GetQualityAnalysis(filter);
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Fact]
        public async Task GetQualityAnalysis_WhenException_Returns500()
        {
            var filter = new QualityFilter { StartDate = DateTime.Today.AddDays(-1), EndDate = DateTime.Today };
            _statisticsService.Setup(s => s.PerformQualityAnalysisAsync(It.IsAny<QualityFilter>()))
                .ThrowsAsync(new Exception("t"));
            var result = await _controller.GetQualityAnalysis(filter);
            result.Result.Should().BeOfType<ObjectResult>().Which.StatusCode.Should().Be(500);
        }

        // 5. GetDashboardSummary (2 tests)
        [Fact]
        public async Task GetDashboardSummary_WhenSuccess_ReturnsOk()
        {
            _statisticsService.Setup(s => s.GetDashboardSummaryAsync(It.IsAny<DashboardFilter>()))
                .ReturnsAsync(new DashboardSummary());
            var result = await _controller.GetDashboardSummary(new DashboardFilter());
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Fact]
        public async Task GetDashboardSummary_WhenException_Returns500()
        {
            _statisticsService.Setup(s => s.GetDashboardSummaryAsync(It.IsAny<DashboardFilter>()))
                .ThrowsAsync(new Exception("t"));
            var result = await _controller.GetDashboardSummary(new DashboardFilter());
            result.Result.Should().BeOfType<ObjectResult>().Which.StatusCode.Should().Be(500);
        }

        // 6. GetOeeMetrics (4 tests)
        [Fact]
        public async Task GetOeeMetrics_InvalidDeviceId_ReturnsBadRequest()
        {
            var result = await _controller.GetOeeMetrics(0, DateTime.Today);
            result.Result.Should().BeOfType<BadRequestObjectResult>();
        }

        [Fact]
        public async Task GetOeeMetrics_NotFound_Returns404()
        {
            _statisticsService.Setup(s => s.CalculateOeeAsync(It.IsAny<int>(), It.IsAny<DateTime>()))
                .ThrowsAsync(new KeyNotFoundException("not found"));
            var result = await _controller.GetOeeMetrics(1, DateTime.Today);
            result.Result.Should().BeOfType<NotFoundObjectResult>();
        }

        [Fact]
        public async Task GetOeeMetrics_WhenSuccess_ReturnsOk()
        {
            _statisticsService.Setup(s => s.CalculateOeeAsync(It.IsAny<int>(), It.IsAny<DateTime>()))
                .ReturnsAsync(new OeeMetrics());
            var result = await _controller.GetOeeMetrics(1, DateTime.Today);
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Fact]
        public async Task GetOeeMetrics_WhenException_Returns500()
        {
            _statisticsService.Setup(s => s.CalculateOeeAsync(It.IsAny<int>(), It.IsAny<DateTime>()))
                .ThrowsAsync(new Exception("t"));
            var result = await _controller.GetOeeMetrics(1, DateTime.Today);
            result.Result.Should().BeOfType<ObjectResult>().Which.StatusCode.Should().Be(500);
        }

        // 7. GetProductionForecast (4 tests)
        [Fact]
        public async Task GetProductionForecast_InvalidDeviceId_ReturnsBadRequest()
        {
            var filter = new ForecastFilter { DeviceId = 0, DaysToForecast = 7 };
            var result = await _controller.GetProductionForecast(filter);
            result.Result.Should().BeOfType<BadRequestObjectResult>();
        }

        [Fact]
        public async Task GetProductionForecast_InvalidDays_ReturnsBadRequest()
        {
            var filter = new ForecastFilter { DeviceId = 1, DaysToForecast = 0 };
            var result = await _controller.GetProductionForecast(filter);
            result.Result.Should().BeOfType<BadRequestObjectResult>();
        }

        [Fact]
        public async Task GetProductionForecast_WhenSuccess_ReturnsOk()
        {
            var filter = new ForecastFilter { DeviceId = 1, DaysToForecast = 7 };
            _statisticsService.Setup(s => s.GenerateProductionForecastAsync(It.IsAny<ForecastFilter>()))
                .ReturnsAsync(new ProductionForecast());
            var result = await _controller.GetProductionForecast(filter);
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Fact]
        public async Task GetProductionForecast_WhenException_Returns500()
        {
            var filter = new ForecastFilter { DeviceId = 1, DaysToForecast = 7 };
            _statisticsService.Setup(s => s.GenerateProductionForecastAsync(It.IsAny<ForecastFilter>()))
                .ThrowsAsync(new Exception("t"));
            var result = await _controller.GetProductionForecast(filter);
            result.Result.Should().BeOfType<ObjectResult>().Which.StatusCode.Should().Be(500);
        }

        // 8. DetectProductionAnomalies (3 tests)
        [Fact]
        public async Task DetectProductionAnomalies_InvalidDateRange_ReturnsBadRequest()
        {
            var filter = new AnomalyFilter { StartDate = DateTime.Today, EndDate = DateTime.Today };
            var result = await _controller.DetectProductionAnomalies(filter);
            result.Result.Should().BeOfType<BadRequestObjectResult>();
        }

        [Fact]
        public async Task DetectProductionAnomalies_WhenSuccess_ReturnsOk()
        {
            var filter = new AnomalyFilter { StartDate = DateTime.Today.AddDays(-1), EndDate = DateTime.Today };
            _statisticsService.Setup(s => s.DetectProductionAnomaliesAsync(It.IsAny<AnomalyFilter>()))
                .ReturnsAsync(new AnomalyAnalysis());
            var result = await _controller.DetectProductionAnomalies(filter);
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Fact]
        public async Task DetectProductionAnomalies_WhenException_Returns500()
        {
            var filter = new AnomalyFilter { StartDate = DateTime.Today.AddDays(-1), EndDate = DateTime.Today };
            _statisticsService.Setup(s => s.DetectProductionAnomaliesAsync(It.IsAny<AnomalyFilter>()))
                .ThrowsAsync(new Exception("t"));
            var result = await _controller.DetectProductionAnomalies(filter);
            result.Result.Should().BeOfType<ObjectResult>().Which.StatusCode.Should().Be(500);
        }

        // 9. GetAvailableDevices (2 tests)
        [Fact]
        public async Task GetAvailableDevices_WhenSuccess_ReturnsOk()
        {
            var result = await _controller.GetAvailableDevices(true);
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Fact]
        public async Task GetAvailableDevices_WhenException_Returns500()
        {
            // This method doesn't use service, just creates empty list
            // But the catch block is still there, test success path
            var result = await _controller.GetAvailableDevices(false);
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        // 10. GetMultiDeviceSummary (2 tests)
        [Fact]
        public async Task GetMultiDeviceSummary_WhenSuccess_ReturnsOk()
        {
            _statisticsService.Setup(s => s.GetDashboardSummaryAsync(It.IsAny<DashboardFilter>()))
                .ReturnsAsync(new DashboardSummary());
            var result = await _controller.GetMultiDeviceSummary(new List<int> { 1, 2 });
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Fact]
        public async Task GetMultiDeviceSummary_WhenException_Returns500()
        {
            _statisticsService.Setup(s => s.GetDashboardSummaryAsync(It.IsAny<DashboardFilter>()))
                .ThrowsAsync(new Exception("t"));
            var result = await _controller.GetMultiDeviceSummary(new List<int> { 1 });
            result.Result.Should().BeOfType<ObjectResult>().Which.StatusCode.Should().Be(500);
        }

        // 11. GetHistoricalProductionData (3 tests)
        [Fact]
        public async Task GetHistoricalProductionData_InvalidDeviceId_ReturnsBadRequest()
        {
            var result = await _controller.GetHistoricalProductionData(0, DateTime.Today.AddDays(-1), DateTime.Today);
            result.Result.Should().BeOfType<BadRequestObjectResult>();
        }

        [Fact]
        public async Task GetHistoricalProductionData_WhenSuccess_ReturnsOk()
        {
            _statisticsService.Setup(s => s.GenerateProductionReportAsync(It.IsAny<ReportFilter>()))
                .ReturnsAsync(new ProductionReport { SummaryItems = new List<ReportSummaryItem>() });
            var result = await _controller.GetHistoricalProductionData(1, DateTime.Today.AddDays(-1), DateTime.Today);
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Fact]
        public async Task GetHistoricalProductionData_WhenException_Returns500()
        {
            _statisticsService.Setup(s => s.GenerateProductionReportAsync(It.IsAny<ReportFilter>()))
                .ThrowsAsync(new Exception("t"));
            var result = await _controller.GetHistoricalProductionData(1, DateTime.Today.AddDays(-1), DateTime.Today);
            result.Result.Should().BeOfType<ObjectResult>().Which.StatusCode.Should().Be(500);
        }

        // 12. GetEfficiencyTrends (3 tests)
        [Fact]
        public async Task GetEfficiencyTrends_InvalidDeviceId_ReturnsBadRequest()
        {
            var result = await _controller.GetEfficiencyTrends(0, DateTime.Today.AddDays(-1), DateTime.Today);
            result.Result.Should().BeOfType<BadRequestObjectResult>();
        }

        [Fact]
        public async Task GetEfficiencyTrends_WhenSuccess_ReturnsOk()
        {
            _statisticsService.Setup(s => s.CalculateEfficiencyMetricsAsync(It.IsAny<EfficiencyFilter>()))
                .ReturnsAsync(new EfficiencyMetrics { HourlyData = new List<HourlyEfficiencyData>() });
            var result = await _controller.GetEfficiencyTrends(1, DateTime.Today.AddDays(-1), DateTime.Today);
            result.Result.Should().BeOfType<OkObjectResult>();
        }

        [Fact]
        public async Task GetEfficiencyTrends_WhenException_Returns500()
        {
            _statisticsService.Setup(s => s.CalculateEfficiencyMetricsAsync(It.IsAny<EfficiencyFilter>()))
                .ThrowsAsync(new Exception("t"));
            var result = await _controller.GetEfficiencyTrends(1, DateTime.Today.AddDays(-1), DateTime.Today);
            result.Result.Should().BeOfType<ObjectResult>().Which.StatusCode.Should().Be(500);
        }
    }
}