using Evergreen.Health.Application.Health.Entities;
using Evergreen.Health.Application.Health.Models;
using Evergreen.Health.Application.Health.Security;
using Furion.DataEncryption;
using Furion.DatabaseAccessor;
using Furion.FriendlyException;
using Microsoft.AspNetCore.Http;
using SqlSugar;
using System.Security.Claims;
using System.Text.Json;

namespace Evergreen.Health.Application.Health.Services;

[ApiDescriptionSettings("健康管理", Name = "Health", Order = 50)]
public sealed class HealthAppService : IDynamicApiController, ITransient
{
    private const string HealthUserIdClaim = "health_user_id";
    private static readonly HashSet<string> SupportedModules = new(StringComparer.OrdinalIgnoreCase)
    {
        "sleep", "exercise", "diet"
    };

    private readonly SqlSugarRepository<HealthUser> _userRepository;
    private readonly SqlSugarRepository<HealthProfile> _profileRepository;
    private readonly SqlSugarRepository<HealthModuleSelection> _moduleRepository;
    private readonly SqlSugarRepository<HealthPlan> _planRepository;
    private readonly IHttpContextAccessor _httpContextAccessor;

    public HealthAppService(
        SqlSugarRepository<HealthUser> userRepository,
        SqlSugarRepository<HealthProfile> profileRepository,
        SqlSugarRepository<HealthModuleSelection> moduleRepository,
        SqlSugarRepository<HealthPlan> planRepository,
        IHttpContextAccessor httpContextAccessor)
    {
        _userRepository = userRepository;
        _profileRepository = profileRepository;
        _moduleRepository = moduleRepository;
        _planRepository = planRepository;
        _httpContextAccessor = httpContextAccessor;
    }

    [AllowAnonymous]
    [HttpPost("/api/health/auth/register")]
    [UnitOfWork]
    public async Task<HealthAuthOutput> Register(HealthRegisterInput input)
    {
        var phone = input.Phone.Trim();
        if (await _userRepository.IsAnyAsync(user => user.Phone == phone && !user.IsDelete))
            throw Oops.Oh("该手机号已经注册");

        var user = await _userRepository.AsInsertable(new HealthUser
        {
            Phone = phone,
            DisplayName = input.DisplayName.Trim(),
            PasswordHash = HealthPasswordHasher.Hash(input.Password),
            Status = HealthUserStatus.Enabled
        }).ExecuteReturnEntityAsync();

        await _profileRepository.InsertAsync(new HealthProfile { UserId = user.Id });
        await _moduleRepository.InsertRangeAsync(new List<HealthModuleSelection>
        {
            new HealthModuleSelection { UserId = user.Id, ModuleCode = "sleep", IsEnabled = true },
            new HealthModuleSelection { UserId = user.Id, ModuleCode = "exercise", IsEnabled = true },
            new HealthModuleSelection { UserId = user.Id, ModuleCode = "diet", IsEnabled = true }
        });

        return CreateAuthOutput(user);
    }

    [AllowAnonymous]
    [HttpPost("/api/health/auth/login")]
    public async Task<HealthAuthOutput> Login(HealthLoginInput input)
    {
        var phone = input.Phone.Trim();
        var user = await _userRepository.GetFirstAsync(item => item.Phone == phone && !item.IsDelete);
        if (user is null || !HealthPasswordHasher.Verify(input.Password, user.PasswordHash))
            throw Oops.Oh("手机号或密码错误").StatusCode(401);
        if (user.Status != HealthUserStatus.Enabled)
            throw Oops.Oh("账号已停用").StatusCode(403);

        user.LastLoginTime = DateTime.Now;
        user.LastLoginIp = _httpContextAccessor.HttpContext?.Connection.RemoteIpAddress?.ToString();
        await _userRepository.AsUpdateable(user)
            .UpdateColumns(item => new { item.LastLoginTime, item.LastLoginIp })
            .ExecuteCommandAsync();

        return CreateAuthOutput(user);
    }

    [Authorize]
    [HttpGet("/api/health/dashboard")]
    public async Task<HealthDashboardOutput> GetDashboard()
    {
        var userId = GetCurrentUserId();
        var user = await GetCurrentUser(userId);
        var profile = await _profileRepository.GetFirstAsync(item => item.UserId == userId);
        var modules = await _moduleRepository.AsQueryable()
            .Where(item => item.UserId == userId && item.IsEnabled)
            .Select(item => item.ModuleCode)
            .ToListAsync();
        var plan = await _planRepository.AsQueryable()
            .Where(item => item.UserId == userId && item.IsCurrent)
            .OrderByDescending(item => item.Version)
            .FirstAsync();

        return new HealthDashboardOutput
        {
            User = MapUser(user),
            Profile = profile is null ? null : MapProfile(profile),
            SelectedModules = modules,
            CurrentPlan = plan is null ? null : MapPlan(plan)
        };
    }

    [Authorize]
    [HttpPut("/api/health/profile")]
    public async Task<SaveHealthProfileInput> SaveProfile(SaveHealthProfileInput input)
    {
        var userId = GetCurrentUserId();
        var profile = await _profileRepository.GetFirstAsync(item => item.UserId == userId);
        if (profile is null)
        {
            profile = new HealthProfile { UserId = userId };
            ApplyProfile(profile, input);
            await _profileRepository.InsertAsync(profile);
        }
        else
        {
            ApplyProfile(profile, input);
            await _profileRepository.UpdateAsync(profile);
        }

        return MapProfile(profile);
    }

    [Authorize]
    [HttpPut("/api/health/modules")]
    [UnitOfWork]
    public async Task<List<string>> SaveModules(SaveHealthModulesInput input)
    {
        var userId = GetCurrentUserId();
        var modules = input.ModuleCodes
            .Select(item => item.Trim().ToLowerInvariant())
            .Where(SupportedModules.Contains)
            .Distinct()
            .ToList();

        if (modules.Count == 0)
            throw Oops.Oh("请至少选择一个健康板块");

        await _moduleRepository.DeleteAsync(item => item.UserId == userId);
        await _moduleRepository.InsertRangeAsync(modules.Select(module => new HealthModuleSelection
        {
            UserId = userId,
            ModuleCode = module,
            IsEnabled = true
        }).ToList());

        return modules;
    }

    [Authorize]
    [HttpPost("/api/health/plans/generate")]
    [UnitOfWork]
    public async Task<HealthPlanOutput> GeneratePlan()
    {
        var userId = GetCurrentUserId();
        var profile = await _profileRepository.GetFirstAsync(item => item.UserId == userId);
        var modules = await _moduleRepository.AsQueryable()
            .Where(item => item.UserId == userId && item.IsEnabled)
            .Select(item => item.ModuleCode)
            .ToListAsync();

        if (modules.Count == 0)
            throw Oops.Oh("请先选择健康板块");

        var items = BuildPlanItems(profile, modules);
        var currentVersion = await _planRepository.AsQueryable()
            .Where(item => item.UserId == userId)
            .MaxAsync(item => (int?)item.Version) ?? 0;

        await _planRepository.Context.Updateable<HealthPlan>()
            .SetColumns(item => item.IsCurrent == false)
            .Where(item => item.UserId == userId && item.IsCurrent)
            .ExecuteCommandAsync();

        var plan = await _planRepository.AsInsertable(new HealthPlan
        {
            UserId = userId,
            Version = currentVersion + 1,
            Title = "您的专属健康方案",
            Summary = BuildSummary(profile, modules),
            ParametersJson = JsonSerializer.Serialize(items),
            IsCurrent = true
        }).ExecuteReturnEntityAsync();

        return MapPlan(plan);
    }

    private long GetCurrentUserId()
    {
        var value = _httpContextAccessor.HttpContext?.User.FindFirstValue(HealthUserIdClaim);
        if (!long.TryParse(value, out var userId))
            throw Oops.Oh("登录状态已失效").StatusCode(401);
        return userId;
    }

    private async Task<HealthUser> GetCurrentUser(long userId)
    {
        return await _userRepository.GetFirstAsync(item => item.Id == userId && !item.IsDelete)
            ?? throw Oops.Oh("用户不存在").StatusCode(401);
    }

    private static void ApplyProfile(HealthProfile profile, SaveHealthProfileInput input)
    {
        profile.Birthday = input.Birthday;
        profile.Gender = input.Gender?.Trim();
        profile.HeightCm = input.HeightCm;
        profile.WeightKg = input.WeightKg;
        profile.AverageSleepHours = input.AverageSleepHours;
        profile.DailyExerciseMinutes = input.DailyExerciseMinutes;
        profile.DietPreference = input.DietPreference?.Trim();
        profile.HealthGoal = input.HealthGoal?.Trim();
    }

    private static SaveHealthProfileInput MapProfile(HealthProfile profile) => new()
    {
        Birthday = profile.Birthday,
        Gender = profile.Gender,
        HeightCm = profile.HeightCm,
        WeightKg = profile.WeightKg,
        AverageSleepHours = profile.AverageSleepHours,
        DailyExerciseMinutes = profile.DailyExerciseMinutes,
        DietPreference = profile.DietPreference,
        HealthGoal = profile.HealthGoal
    };

    private static HealthUserOutput MapUser(HealthUser user) => new()
    {
        Id = user.Id,
        Phone = user.Phone,
        DisplayName = user.DisplayName,
        AvatarUrl = user.AvatarUrl
    };

    private static List<HealthPlanItemOutput> BuildPlanItems(HealthProfile? profile, IEnumerable<string> modules)
    {
        var items = new List<HealthPlanItemOutput>();
        foreach (var module in modules)
        {
            switch (module)
            {
                case "sleep":
                    items.Add(new HealthPlanItemOutput
                    {
                        ModuleCode = module,
                        Title = "睡眠质量",
                        Target = profile?.AverageSleepHours is < 7 ? "逐步达到每晚 7–8 小时" : "保持每晚 7–8 小时",
                        Advice = "固定入睡时间，睡前一小时降低灯光亮度，并使用卧室舒睡场景。"
                    });
                    break;
                case "exercise":
                    items.Add(new HealthPlanItemOutput
                    {
                        ModuleCode = module,
                        Title = "运动情况",
                        Target = profile?.DailyExerciseMinutes is >= 30 ? "保持每日 30 分钟以上活动" : "从每日 20 分钟步行开始",
                        Advice = "优先安排低到中等强度运动，每坐一小时起身活动 3–5 分钟。"
                    });
                    break;
                case "diet":
                    items.Add(new HealthPlanItemOutput
                    {
                        ModuleCode = module,
                        Title = "饮食情况",
                        Target = "三餐规律，晚餐不过量",
                        Advice = string.IsNullOrWhiteSpace(profile?.DietPreference)
                            ? "记录三餐与饮水情况，优先增加蔬菜和优质蛋白。"
                            : $"结合“{profile.DietPreference}”偏好控制总量，并保持食物多样性。"
                    });
                    break;
            }
        }
        return items;
    }

    private static string BuildSummary(HealthProfile? profile, IReadOnlyCollection<string> modules)
    {
        var bmiText = string.Empty;
        if (profile?.HeightCm > 0 && profile.WeightKg > 0)
        {
            var height = profile.HeightCm.Value / 100m;
            var bmi = Math.Round(profile.WeightKg.Value / (height * height), 1);
            bmiText = $" 当前 BMI 约为 {bmi}。";
        }

        return $"方案依据您选择的 {modules.Count} 个健康板块生成。{bmiText}第一版参数用于健康管理演示，不替代专业医疗诊断。";
    }

    private static HealthPlanOutput MapPlan(HealthPlan plan) => new()
    {
        Id = plan.Id,
        Version = plan.Version,
        Title = plan.Title,
        Summary = plan.Summary,
        CreateTime = plan.CreateTime,
        Items = JsonSerializer.Deserialize<List<HealthPlanItemOutput>>(plan.ParametersJson) ?? []
    };

    private static HealthAuthOutput CreateAuthOutput(HealthUser user)
    {
        const int accessTokenMinutes = 24 * 60;
        const int refreshTokenMinutes = 7 * 24 * 60;
        var accessToken = JWTEncryption.Encrypt(new Dictionary<string, object>
        {
            [HealthUserIdClaim] = user.Id,
            [ClaimTypes.NameIdentifier] = user.Id,
            [ClaimTypes.Name] = user.DisplayName,
            [ClaimTypes.MobilePhone] = user.Phone,
            ["account_type"] = "health_user"
        }, accessTokenMinutes);

        return new HealthAuthOutput
        {
            AccessToken = accessToken,
            RefreshToken = JWTEncryption.GenerateRefreshToken(accessToken, refreshTokenMinutes),
            User = MapUser(user)
        };
    }
}