using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Haoliang.Models.Template;
using Haoliang.Models.Device;
using Haoliang.Models.DataCollection;

namespace Haoliang.Core.Services
{
    public interface ITemplateService
    {
        Task<CNCBrandTemplate> CreateTemplateAsync(CNCBrandTemplate template);
        Task<CNCBrandTemplate> UpdateTemplateAsync(int templateId, CNCBrandTemplate template);
        Task<bool> DeleteTemplateAsync(int templateId);
        Task<CNCBrandTemplate> GetTemplateByIdAsync(int templateId);
        Task<IEnumerable<CNCBrandTemplate>> GetAllTemplatesAsync();
        Task<IEnumerable<CNCBrandTemplate>> GetTemplatesByBrandAsync(string brandName);
        Task<IEnumerable<CNCBrandTemplate>> GetActiveTemplatesAsync();
        Task<bool> ValidateTemplateAsync(CNCBrandTemplate template);
        Task TestTemplateAsync(int templateId);
        Task<CNCBrandTemplate> CloneTemplateAsync(int templateId, string newName);
        Task<bool> EnableTemplateAsync(int templateId);
        Task<bool> DisableTemplateAsync(int templateId);
    }

    public interface ITagMappingService
    {
        Task<TagMapping> CreateTagMappingAsync(TagMapping mapping);
        Task<TagMapping> UpdateTagMappingAsync(int mappingId, TagMapping mapping);
        Task<bool> DeleteTagMappingAsync(int mappingId);
        Task<TagMapping> GetTagMappingByIdAsync(int mappingId);
        Task<IEnumerable<TagMapping>> GetAllTagMappingsAsync();
        Task<IEnumerable<TagMapping>> GetMappingsByTemplateAsync(int templateId);
        Task<TagMapping> MapDeviceTagAsync(TagData deviceTag, int templateId);
        Task<Dictionary<string, TagData>> MapDeviceTagsAsync(IEnumerable<TagData> deviceTags, int templateId);
        Task ValidateTagMappingAsync(TagMapping mapping);
    }

    public interface ITemplateValidationService
    {
        Task<bool> ValidateTemplateStructureAsync(CNCBrandTemplate template);
        Task<bool> ValidateTagMappingsAsync(CNCBrandTemplate template);
        Task<bool> ValidateDataParsingRulesAsync(CNCBrandTemplate template);
        Task<IEnumerable<ValidationError>> ValidateTemplateForDeviceAsync(int templateId, int deviceId);
        Task<bool> TestTemplateDataParsingAsync(CNCBrandTemplate template, string sampleData);
        Task<IEnumerable<string>> GetMissingRequiredTagsAsync(CNCBrandTemplate template);
    }

    public interface ITemplateMigrationService
    {
        Task<CNCBrandTemplate> MigrateTemplateAsync(CNCBrandTemplate oldTemplate, string targetBrand);
        Task<bool> ValidateMigrationCompatibilityAsync(CNCBrandTemplate sourceTemplate, string targetBrand);
        Task<MigrationReport> GenerateMigrationReportAsync(CNCBrandTemplate template, string targetBrand);
        Task<IEnumerable<MigrationIssue>> DetectMigrationIssuesAsync(CNCBrandTemplate template, string targetBrand);
    }

    public class TemplateManager : ITemplateService
    {
        private readonly ITemplateRepository _templateRepository;
        private readonly ITagMappingService _tagMappingService;
        private readonly ITemplateValidationService _validationService;
        private readonly ITemplateMigrationService _migrationService;

        public TemplateManager(
            ITemplateRepository templateRepository,
            ITagMappingService tagMappingService,
            ITemplateValidationService validationService,
            ITemplateMigrationService migrationService)
        {
            _templateRepository = templateRepository;
            _tagMappingService = tagMappingService;
            _validationService = validationService;
            _migrationService = migrationService;
        }

        public async Task<CNCBrandTemplate> CreateTemplateAsync(CNCBrandTemplate template)
        {
            // 验证模板
            var validationErrors = await _validationService.ValidateTemplateStructureAsync(template);
            if (validationErrors.Count > 0)
            {
                throw new InvalidOperationException($"Template validation failed: {string.Join(", ", validationErrors)}");
            }

            // 设置初始状态
            template.IsEnabled = true;
            template.CreateTime = DateTime.Now;
            template.UpdateTime = DateTime.Now;

            var createdTemplate = await _templateRepository.AddAsync(template);
            
            // 验证标签映射
            await _validationService.ValidateTagMappingsAsync(createdTemplate);
            
            return createdTemplate;
        }

        public async Task<CNCBrandTemplate> UpdateTemplateAsync(int templateId, CNCBrandTemplate template)
        {
            var existingTemplate = await _templateRepository.GetByIdAsync(templateId);
            if (existingTemplate == null)
            {
                throw new KeyNotFoundException($"Template with ID {templateId} not found");
            }

            // 验证更新后的模板
            var validationErrors = await _validationService.ValidateTemplateStructureAsync(template);
            if (validationErrors.Count > 0)
            {
                throw new InvalidOperationException($"Template validation failed: {string.Join(", ", validationErrors)}");
            }

            template.TemplateId = templateId;
            template.UpdateTime = DateTime.Now;

            var updatedTemplate = await _templateRepository.UpdateAsync(template);
            
            // 如果标签有变化，重新验证
            if (HasTagMappingsChanged(existingTemplate, template))
            {
                await _validationService.ValidateTagMappingsAsync(updatedTemplate);
            }

            return updatedTemplate;
        }

        public async Task<bool> DeleteTemplateAsync(int templateId)
        {
            // 检查模板是否被使用
            var isTemplateInUse = await _templateRepository.IsTemplateInUseAsync(templateId);
            if (isTemplateInUse)
            {
                throw new InvalidOperationException("Cannot delete template that is currently in use by devices");
            }

            return await _templateRepository.DeleteAsync(templateId);
        }

        public async Task<CNCBrandTemplate> GetTemplateByIdAsync(int templateId)
        {
            return await _templateRepository.GetByIdAsync(templateId);
        }

        public async Task<IEnumerable<CNCBrandTemplate>> GetAllTemplatesAsync()
        {
            return await _templateRepository.GetAllAsync();
        }

        public async Task<IEnumerable<CNCBrandTemplate>> GetTemplatesByBrandAsync(string brandName)
        {
            return await _templateRepository.GetByBrandAsync(brandName);
        }

        public async Task<IEnumerable<CNCBrandTemplate>> GetActiveTemplatesAsync()
        {
            return await _templateRepository.GetActiveTemplatesAsync();
        }

        public async Task<bool> ValidateTemplateAsync(CNCBrandTemplate template)
        {
            return await _validationService.ValidateTemplateStructureAsync(template);
        }

        public async Task TestTemplateAsync(int templateId)
        {
            var template = await _templateRepository.GetByIdAsync(templateId);
            if (template == null)
            {
                throw new KeyNotFoundException($"Template with ID {templateId} not found");
            }

            // 使用模板进行数据解析测试
            await _validationService.TestTemplateDataParsingAsync(template, GetSampleData(template));
        }

        public async Task<CNCBrandTemplate> CloneTemplateAsync(int templateId, string newName)
        {
            var originalTemplate = await _templateRepository.GetByIdAsync(templateId);
            if (originalTemplate == null)
            {
                throw new KeyNotFoundException($"Template with ID {templateId} not found");
            }

            var clonedTemplate = new CNCBrandTemplate
            {
                TemplateName = newName,
                BrandName = originalTemplate.BrandName,
                Description = $"Cloned from {originalTemplate.TemplateName}",
                IsEnabled = false, // 新克隆的模板默认禁用
                Version = originalTemplate.Version,
                TemplateJson = originalTemplate.TemplateJson,
                CreateTime = DateTime.Now,
                UpdateTime = DateTime.Now
            };

            return await CreateTemplateAsync(clonedTemplate);
        }

        public async Task<bool> EnableTemplateAsync(int templateId)
        {
            var template = await _templateRepository.GetByIdAsync(templateId);
            if (template == null)
            {
                return false;
            }

            template.IsEnabled = true;
            template.UpdateTime = DateTime.Now;

            return await _templateRepository.UpdateAsync(template) != null;
        }

        public async Task<bool> DisableTemplateAsync(int templateId)
        {
            var template = await _templateRepository.GetByIdAsync(templateId);
            if (template == null)
            {
                return false;
            }

            // 检查是否还有设备在使用此模板
            var isTemplateInUse = await _templateRepository.IsTemplateInUseAsync(templateId);
            if (isTemplateInUse)
            {
                throw new InvalidOperationException("Cannot disable template that is currently in use by devices");
            }

            template.IsEnabled = false;
            template.UpdateTime = DateTime.Now;

            return await _templateRepository.UpdateAsync(template) != null;
        }

        private bool HasTagMappingsChanged(CNCBrandTemplate oldTemplate, CNCBrandTemplate newTemplate)
        {
            // 简单比较JSON内容是否变化
            return oldTemplate.TemplateJson != newTemplate.TemplateJson;
        }

        private string GetSampleData(CNCBrandTemplate template)
        {
            // 返回模拟的设备数据用于测试
            return @"{
                ""device"": ""FANUC_01"",
                ""desc"": ""CNC Machine"",
                ""tags"": [
                    {
                        ""id"": ""_io_status"",
                        ""desc"": ""I/O Status"",
                        ""quality"": 0,
                        ""value"": 1,
                        ""time"": ""2024-01-01T10:00:00""
                    },
                    {
                        ""id"": ""Tag5"",
                        ""desc"": ""NC Program"",
                        ""quality"": 0,
                        ""value"": ""O1234"",
                        ""time"": ""2024-01-01T10:00:00""
                    },
                    {
                        ""id"": ""Tag8"",
                        ""desc"": ""Cumulative Count"",
                        ""quality"": 0,
                        ""value"": 12345.00000,
                        ""time"": ""2024-01-01T10:00:00""
                    }
                ]
            }";
        }
    }
}