using Microsoft.AspNetCore.Mvc;
using HardwarePerformance.API.Models;

namespace HardwarePerformance.API.Controllers
{
    [ApiController]
    [Route("api/[controller]")]
    public class ComparisonController : ControllerBase
    {
        private static readonly List<Product> _products = new()
        {
            new Product 
            { 
                Id = 1, 
                Name = "Apple A17 Pro", 
                Model = "A17 Pro", 
                Manufacturer = "Apple", 
                CategoryId = 1, 
                CurrentRank = 1,
                ReleaseDate = new DateTime(2023, 9, 12),
                Price = null
            },
            new Product 
            { 
                Id = 2, 
                Name = "Snapdragon 8 Gen 3", 
                Model = "SM8650-AB", 
                Manufacturer = "Qualcomm", 
                CategoryId = 1, 
                CurrentRank = 2,
                ReleaseDate = new DateTime(2023, 10, 24),
                Price = null
            },
            new Product 
            { 
                Id = 3, 
                Name = "Intel Core i9-13900K", 
                Model = "Core i9-13900K", 
                Manufacturer = "Intel", 
                CategoryId = 3, 
                CurrentRank = 1,
                ReleaseDate = new DateTime(2022, 10, 20),
                Price = 589.99m
            },
            new Product 
            { 
                Id = 4, 
                Name = "AMD Ryzen 9 7950X", 
                Model = "Ryzen 9 7950X", 
                Manufacturer = "AMD", 
                CategoryId = 3, 
                CurrentRank = 2,
                ReleaseDate = new DateTime(2022, 9, 27),
                Price = 699.99m
            },
            new Product 
            { 
                Id = 5, 
                Name = "NVIDIA GeForce RTX 4090", 
                Model = "RTX 4090", 
                Manufacturer = "NVIDIA", 
                CategoryId = 4, 
                CurrentRank = 1,
                ReleaseDate = new DateTime(2022, 10, 12),
                Price = 1599.99m
            },
            new Product 
            { 
                Id = 6, 
                Name = "AMD Radeon RX 7900 XTX", 
                Model = "RX 7900 XTX", 
                Manufacturer = "AMD", 
                CategoryId = 4, 
                CurrentRank = 2,
                ReleaseDate = new DateTime(2022, 12, 3),
                Price = 999.99m
            }
        };

        [HttpPost]
        public ActionResult<ApiResponse<object>> CompareProducts([FromBody] ComparisonRequest request)
        {
            // 验证请求
            if (request.ProductIds == null || request.ProductIds.Count < 2 || request.ProductIds.Count > 4)
            {
                return BadRequest(new ApiResponse<object>
                {
                    Success = false,
                    Message = "产品ID数量必须在2到4之间"
                });
            }

            // 获取产品
            var products = _products.Where(p => request.ProductIds.Contains(p.Id)).ToList();
            
            if (products.Count != request.ProductIds.Count)
            {
                return NotFound(new ApiResponse<object>
                {
                    Success = false,
                    Message = "一个或多个产品ID无效"
                });
            }

            // 检查是否所有产品属于同一类别
            var categories = products.Select(p => p.CategoryId).Distinct().ToList();
            if (categories.Count > 1)
            {
                return BadRequest(new ApiResponse<object>
                {
                    Success = false,
                    Message = "所有产品必须属于同一类别"
                });
            }

            // 创建对比数据
            var comparisonData = new
            {
                Products = products.Select(p => new
                {
                    p.Id,
                    p.Name,
                    p.Model,
                    p.Manufacturer,
                    p.CategoryId,
                    p.CurrentRank,
                    p.ReleaseDate,
                    p.Price,
                    PerformanceScore = 100 - p.CurrentRank // 使用排名计算模拟性能分数
                }).ToList(),
                Comparison = GenerateComparisonMatrix(products)
            };

            return Ok(new ApiResponse<object>
            {
                Data = comparisonData
            });
        }

        private object GenerateComparisonMatrix(List<Product> products)
        {
            var matrix = new List<Dictionary<string, object>>();
            
            // 添加基本信息行
            matrix.Add(new Dictionary<string, object>
            {
                ["指标"] = "产品名称",
                ["类型"] = "基本信息"
            });
            
            foreach (var product in products)
            {
                matrix[0][$"{product.Name}"] = product.Name;
            }
            
            // 添加制造商行
            matrix.Add(new Dictionary<string, object>
            {
                ["指标"] = "制造商",
                ["类型"] = "基本信息"
            });
            
            foreach (var product in products)
            {
                matrix[1][$"{product.Name}"] = product.Manufacturer;
            }
            
            // 添加型号行
            matrix.Add(new Dictionary<string, object>
            {
                ["指标"] = "型号",
                ["类型"] = "基本信息"
            });
            
            foreach (var product in products)
            {
                matrix[2][$"{product.Name}"] = product.Model;
            }
            
            // 添加排名行
            matrix.Add(new Dictionary<string, object>
            {
                ["指标"] = "当前排名",
                ["类型"] = "性能指标"
            });
            
            foreach (var product in products)
            {
                matrix[3][$"{product.Name}"] = product.CurrentRank;
            }
            
            // 添加性能分数行（模拟）
            matrix.Add(new Dictionary<string, object>
            {
                ["指标"] = "性能分数",
                ["类型"] = "性能指标"
            });
            
            foreach (var product in products)
            {
                matrix[4][$"{product.Name}"] = 100 - product.CurrentRank;
            }
            
            // 添加发布日期行
            matrix.Add(new Dictionary<string, object>
            {
                ["指标"] = "发布日期",
                ["类型"] = "基本信息"
            });
            
            foreach (var product in products)
            {
                matrix[5][$"{product.Name}"] = product.ReleaseDate.ToString("yyyy-MM-dd");
            }
            
            // 添加价格行
            matrix.Add(new Dictionary<string, object>
            {
                ["指标"] = "价格",
                ["类型"] = "基本信息"
            });
            
            foreach (var product in products)
            {
                matrix[6][$"{product.Name}"] = product.Price?.ToString("C") ?? "N/A";
            }
            
            // 标记最优和最差值
            MarkBestAndWorstValues(matrix, products);
            
            return matrix;
        }

        private void MarkBestAndWorstValues(List<Dictionary<string, object>> matrix, List<Product> products)
        {
            // 对于排名，越小越好
            var rankRow = matrix.FirstOrDefault(m => m["指标"].ToString() == "当前排名");
            if (rankRow != null)
            {
                var ranks = products.Select(p => p.CurrentRank).ToList();
                var minRank = ranks.Min();
                var maxRank = ranks.Max();
                
                foreach (var product in products)
                {
                    var rank = product.CurrentRank;
                    if (rank == minRank)
                    {
                        rankRow[$"{product.Name}_isBest"] = true;
                    }
                    else if (rank == maxRank)
                    {
                        rankRow[$"{product.Name}_isWorst"] = true;
                    }
                }
            }
            
            // 对于性能分数，越大越好
            var scoreRow = matrix.FirstOrDefault(m => m["指标"].ToString() == "性能分数");
            if (scoreRow != null)
            {
                var scores = products.Select(p => 100 - p.CurrentRank).ToList();
                var maxScore = scores.Max();
                var minScore = scores.Min();
                
                foreach (var product in products)
                {
                    var score = 100 - product.CurrentRank;
                    if (score == maxScore)
                    {
                        scoreRow[$"{product.Name}_isBest"] = true;
                    }
                    else if (score == minScore)
                    {
                        scoreRow[$"{product.Name}_isWorst"] = true;
                    }
                }
            }
            
            // 对于价格，越小越好
            var priceRow = matrix.FirstOrDefault(m => m["指标"].ToString() == "价格");
            if (priceRow != null)
            {
                var prices = products.Where(p => p.Price.HasValue).Select(p => p.Price!.Value).ToList();
                if (prices.Any())
                {
                    var minPrice = prices.Min();
                    var maxPrice = prices.Max();
                    
                    foreach (var product in products)
                    {
                        if (product.Price.HasValue)
                        {
                            if (product.Price == minPrice)
                            {
                                priceRow[$"{product.Name}_isBest"] = true;
                            }
                            else if (product.Price == maxPrice)
                            {
                                priceRow[$"{product.Name}_isWorst"] = true;
                            }
                        }
                    }
                }
            }
        }
    }

    public class ComparisonRequest
    {
        public List<int> ProductIds { get; set; } = new();
    }
}