using Microsoft.Extensions.Logging;
using QYZH.InteractiveMagazine.IService;
using QYZH.InteractiveMagazine.Models.Common;
using QYZH.InteractiveMagazine.Models.Dto;
using QYZH.InteractiveMagazine.Models.Dto.Pet;
using QYZH.InteractiveMagazine.Models.Entity;
using QYZH.InteractiveMagazine.Repository;
using SqlSugar;

namespace QYZH.InteractiveMagazine.Service;

/// <summary>
/// 宠物服务实现
/// </summary>
public class PetService(
    BaseRepository<Pet> petRepository,
    BaseRepository<PetFeedingRecord> feedingRecordRepository,
    BaseRepository<PetEvolution> petEvolutionRepository,
    ILogger<PetService> logger)
    : BaseRepository<Pet>, IPetService
{
    /// <summary>
    /// 获取用户宠物信息
    /// </summary>
    public async Task<PetOutput?> GetPetByUserIdAsync(long userId)
    {
        logger.LogInformation("获取用户宠物信息，UserId: {UserId}", userId);

        var pet = await petRepository.Queryable()
            .Where(p => p.UserId == userId)
            .Select(p => new PetOutput
            {
                Id = p.Id,
                UserId = p.UserId,
                Name = p.Name,
                CurrentEvolutionId = p.CurrentEvolutionId,
                GrowthPoints = p.GrowthPoints,
                FeedingCount = p.FeedingCount,
                Type = p.Type,
                Status = p.Status,
                CreatedAt = p.CreatedAt
            })
            .FirstAsync();

        return pet;
    }

    /// <summary>
    /// 为用户创建默认宠物（最低形态、成长值为0、未激活状态）
    /// </summary>
    public async Task CreateDefaultPetAsync(long userId)
    {
        logger.LogInformation("为用户创建默认宠物，UserId: {UserId}", userId);

        // 检查用户是否已有宠物
        var exists = petRepository.Context.Queryable<Pet>()
            .Any(p => p.UserId == userId);
        if (exists)
        {
            logger.LogWarning("用户已存在宠物，跳过创建，UserId: {UserId}", userId);
            return;
        }

        var pet = new Pet
        {
            UserId = userId,
            Name = "小精灵",
            CurrentEvolutionId = 1,
            GrowthPoints = 0,
            FeedingCount = 0,
            Type = "Normal",
            Status = "Inactive",
            IsDeleted = false,
            CreatedBy = userId.ToString(),
            CreatedAt = DateTime.Now,
            UpdatedBy = userId.ToString(),
            UpdatedAt = DateTime.Now
        };

        var result = await petRepository.InsertAsync(pet);
        if (!result)
        {
            logger.LogError("创建默认宠物失败，UserId: {UserId}", userId);
            throw new Exception("创建宠物失败");
        }

        logger.LogInformation("用户默认宠物创建成功，UserId: {UserId}, PetId: {PetId}", userId, pet.Id);
    }

    /// <summary>
    /// 激活宠物（将状态从 Inactive 改为 Active）
    /// </summary>
    public async Task ActivatePetAsync(long userId)
    {
        logger.LogInformation("激活用户宠物，UserId: {UserId}", userId);

        var pet = await petRepository.Queryable()
            .Where(p => p.UserId == userId)
            .FirstAsync();

        if (pet == null)
        {
            logger.LogWarning("用户宠物不存在，无法激活，UserId: {UserId}", userId);
            return;
        }

        if (pet.Status != "Inactive")
        {
            logger.LogInformation("用户宠物已非未激活状态，跳过激活，UserId: {UserId}, Status: {Status}", userId, pet.Status);
            return;
        }

        var result = await petRepository.UpdateAsync(
            p => new Pet { Status = "Active" },
            p => p.UserId == userId);

        if (!result)
        {
            logger.LogError("激活宠物失败，UserId: {UserId}", userId);
            throw new Exception("激活宠物失败");
        }

        logger.LogInformation("用户宠物激活成功，UserId: {UserId}", userId);
    }

    /// <summary>
    /// 喂养宠物（增加成长值 + 记录喂养记录 + 触发进化检查）
    /// </summary>
    public async Task<FeedPetOutput> FeedPetAsync(long userId, FeedPetInput input)
    {
        logger.LogInformation("喂养宠物，UserId: {UserId}, PetId: {PetId}, GrowthPoints: {GrowthPoints}",
            userId, input.PetId, input.GrowthPoints);

        if (input.PetId <= 0)
        {
            throw new BusinessException("宠物Id不能为空", 400);
        }

        if (input.GrowthPoints <= 0)
        {
            throw new BusinessException("成长值必须大于0", 400);
        }

        // 查询宠物
        var pet = await petRepository.GetByIdAsync(input.PetId);
        if (pet == null || pet.IsDeleted)
        {
            logger.LogWarning("喂养失败，宠物不存在，PetId: {PetId}", input.PetId);
            throw new BusinessException("宠物不存在", 404);
        }

        // 校验宠物归属
        if (pet.UserId != userId)
        {
            logger.LogWarning("喂养失败，无权操作该宠物，UserId: {UserId}, PetUserId: {PetUserId}", userId, pet.UserId);
            throw new BusinessException("无权操作该宠物", 403);
        }

        // 校验宠物状态
        if (pet.Status != "Active")
        {
            logger.LogWarning("喂养失败，宠物未激活，PetId: {PetId}, Status: {Status}", input.PetId, pet.Status);
            throw new BusinessException("宠物未激活，无法喂养", 400);
        }

        var growthBefore = pet.GrowthPoints;
        var growthAfter = growthBefore + input.GrowthPoints;
        var hasEvolved = false;
        string? evolvedStageName = null;

        // 事务保证一致性
        await UseTranAsync(async () =>
        {
            // 累加成长值和喂养次数
            var updateResult = await petRepository.Context.Updateable<Pet>()
                .SetColumns(p => p.GrowthPoints == growthAfter)
                .SetColumns(p => p.FeedingCount == p.FeedingCount + 1)
                .SetColumns(p => p.UpdatedAt == DateTime.Now)
                .SetColumns(p => p.UpdatedBy == userId.ToString())
                .Where(p => p.Id == input.PetId)
                .ExecuteCommandAsync();

            if (updateResult <= 0)
            {
                throw new BusinessException("更新宠物成长值失败", 500);
            }

            // 进化检查：查找下一阶段进化形态
            var nextEvolution = await petEvolutionRepository.Queryable()
                .Where(e => e.PreviousEvolutionId == pet.CurrentEvolutionId
                         && e.RequiredGrowth <= growthAfter
                         && e.Status == "Active")
                .OrderBy(e => e.RequiredGrowth, OrderByType.Desc)
                .FirstAsync();

            if (nextEvolution != null)
            {
                // 触发进化
                var evolveResult = await petRepository.Context.Updateable<Pet>()
                    .SetColumns(p => p.CurrentEvolutionId == nextEvolution.Id)
                    .SetColumns(p => p.UpdatedAt == DateTime.Now)
                    .SetColumns(p => p.UpdatedBy == userId.ToString())
                    .Where(p => p.Id == input.PetId)
                    .ExecuteCommandAsync();

                if (evolveResult > 0)
                {
                    hasEvolved = true;
                    evolvedStageName = nextEvolution.StageName;
                    logger.LogInformation("宠物进化成功，PetId: {PetId}, 新形态: {StageName} (Level {StageLevel})",
                        input.PetId, nextEvolution.StageName, nextEvolution.StageLevel);
                }
            }

            // 写入喂养记录
            var record = new PetFeedingRecord
            {
                PetId = input.PetId,
                UserId = userId,
                PointsUsed = 0, // 预留：后期可扩展为消耗积分喂养
                GrowthChange = input.GrowthPoints,
                GrowthBefore = growthBefore,
                GrowthAfter = growthAfter,
                Type = "Normal",
                Status = "Success",
                IsDeleted = false,
                CreatedBy = userId.ToString(),
                CreatedAt = DateTime.Now,
                UpdatedBy = userId.ToString(),
                UpdatedAt = DateTime.Now
            };

            var insertResult = await feedingRecordRepository.InsertAsync(record);
            if (!insertResult)
            {
                throw new BusinessException("写入喂养记录失败", 500);
            }
        });

        logger.LogInformation("喂养宠物成功，PetId: {PetId}, 成长值: {Before} -> {After}, 进化: {HasEvolved}",
            input.PetId, growthBefore, growthAfter, hasEvolved);

        return new FeedPetOutput
        {
            PetId = input.PetId,
            GrowthBefore = growthBefore,
            GrowthAfter = growthAfter,
            GrowthChange = input.GrowthPoints,
            HasEvolved = hasEvolved,
            EvolvedStageName = evolvedStageName
        };
    }

    /// <summary>
    /// 获取宠物喂养记录列表
    /// </summary>
    public async Task<PageListModel<FeedingRecordOutput>> GetFeedingRecordsAsync(long userId, long petId, PageQueryModel pageQuery)
    {
        logger.LogInformation("查询喂养记录，UserId: {UserId}, PetId: {PetId}, PageIndex: {PageIndex}, PageSize: {PageSize}",
            userId, petId, pageQuery.PageIndex, pageQuery.PageSize);

        RefAsync<int> totalNumber = 0;
        var records = await feedingRecordRepository.Queryable()
            .Where(r => r.UserId == userId && r.PetId == petId)
            .OrderByDescending(r => r.CreatedAt)
            .Select(r => new FeedingRecordOutput
            {
                Id = r.Id,
                PetId = r.PetId,
                UserId = r.UserId,
                GrowthChange = r.GrowthChange,
                GrowthBefore = r.GrowthBefore,
                GrowthAfter = r.GrowthAfter,
                Type = r.Type,
                Status = r.Status,
                CreatedAt = r.CreatedAt
            }, true)
            .ToPageListAsync(pageQuery.PageIndex, pageQuery.PageSize, totalNumber);

        return new PageListModel<FeedingRecordOutput>(records, pageQuery.PageIndex, pageQuery.PageSize, totalNumber);
    }
}