using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Fengling.Platform.Domain.AggregatesModel.GatewayAggregate;

namespace Fengling.Platform.Infrastructure;

/// <summary>
/// 集群存储实现
/// </summary>
public class ClusterStore<TContext> : IClusterStore
    where TContext : PlatformDbContext
{
    private readonly TContext _context;
    private readonly DbSet<GwCluster> _clusters;

    public ClusterStore(TContext context)
    {
        _context = context;
        _clusters = context.GwClusters;
    }

    public void Dispose() { }

    public virtual Task<GwCluster?> FindByIdAsync(string? id, CancellationToken cancellationToken = default)
    {
        if (id == null) return Task.FromResult<GwCluster?>(null);
        return _clusters.FirstOrDefaultAsync(c => c.Id == id, cancellationToken);
    }

    public virtual Task<GwCluster?> FindByClusterIdAsync(string clusterId, CancellationToken cancellationToken = default)
    {
        return _clusters.FirstOrDefaultAsync(c => c.ClusterId == clusterId && !c.IsDeleted, cancellationToken);
    }

    public virtual async Task<IList<GwCluster>> GetAllAsync(CancellationToken cancellationToken = default)
    {
        return await _clusters.Where(c => !c.IsDeleted).ToListAsync(cancellationToken);
    }

    public virtual async Task<IList<GwCluster>> GetPagedAsync(int page, int pageSize, string? clusterId = null,
        string? name = null, int? status = null, CancellationToken cancellationToken = default)
    {
        var query = _clusters.AsQueryable();

        if (!string.IsNullOrEmpty(clusterId))
            query = query.Where(c => c.ClusterId.Contains(clusterId));

        if (!string.IsNullOrEmpty(name))
            query = query.Where(c => c.Name.Contains(name));

        if (status.HasValue)
            query = query.Where(c => c.Status == status.Value);

        return await query
            .Where(c => !c.IsDeleted)
            .OrderByDescending(c => c.CreatedTime)
            .Skip((page - 1) * pageSize)
            .Take(pageSize)
            .ToListAsync(cancellationToken);
    }

    public virtual async Task<int> GetCountAsync(string? clusterId = null, string? name = null,
        int? status = null, CancellationToken cancellationToken = default)
    {
        var query = _clusters.AsQueryable();

        if (!string.IsNullOrEmpty(clusterId))
            query = query.Where(c => c.ClusterId.Contains(clusterId));

        if (!string.IsNullOrEmpty(name))
            query = query.Where(c => c.Name.Contains(name));

        if (status.HasValue)
            query = query.Where(c => c.Status == status.Value);

        return await query.Where(c => !c.IsDeleted).CountAsync(cancellationToken);
    }

    public virtual async Task<IdentityResult> CreateAsync(GwCluster cluster, CancellationToken cancellationToken = default)
    {
        _clusters.Add(cluster);
        await _context.SaveChangesAsync(cancellationToken);
        return IdentityResult.Success;
    }

    public virtual async Task<IdentityResult> UpdateAsync(GwCluster cluster, CancellationToken cancellationToken = default)
    {
        cluster.UpdatedTime = DateTime.UtcNow;
        _clusters.Update(cluster);
        await _context.SaveChangesAsync(cancellationToken);
        return IdentityResult.Success;
    }

    public virtual async Task<IdentityResult> DeleteAsync(GwCluster cluster, CancellationToken cancellationToken = default)
    {
        // 软删除
        cluster.IsDeleted = true;
        cluster.UpdatedTime = DateTime.UtcNow;
        _clusters.Update(cluster);
        await _context.SaveChangesAsync(cancellationToken);
        return IdentityResult.Success;
    }

    public virtual async Task<GwCluster?> AddDestinationAsync(string clusterId, GwDestination destination, CancellationToken cancellationToken = default)
    {
        var cluster = await _clusters.FirstOrDefaultAsync(c => c.ClusterId == clusterId && !c.IsDeleted, cancellationToken);
        if (cluster == null) return null;

        cluster.Destinations.Add(destination);
        cluster.UpdatedTime = DateTime.UtcNow;
        await _context.SaveChangesAsync(cancellationToken);
        return cluster;
    }

    public virtual async Task<GwCluster?> UpdateDestinationAsync(string clusterId, string destinationId, GwDestination destination, CancellationToken cancellationToken = default)
    {
        var cluster = await _clusters
            .Include(c => c.Destinations)
            .FirstOrDefaultAsync(c => c.ClusterId == clusterId && !c.IsDeleted, cancellationToken);
        
        if (cluster == null) return null;

        var existingDest = cluster.Destinations.FirstOrDefault(d => d.DestinationId == destinationId);
        if (existingDest == null) return null;

        existingDest.Address = destination.Address;
        existingDest.Health = destination.Health;
        existingDest.Weight = destination.Weight;
        existingDest.HealthStatus = destination.HealthStatus;
        existingDest.Status = destination.Status;

        cluster.UpdatedTime = DateTime.UtcNow;
        await _context.SaveChangesAsync(cancellationToken);
        return cluster;
    }

    public virtual async Task<GwCluster?> RemoveDestinationAsync(string clusterId, string destinationId, CancellationToken cancellationToken = default)
    {
        var cluster = await _clusters
            .Include(c => c.Destinations)
            .FirstOrDefaultAsync(c => c.ClusterId == clusterId && !c.IsDeleted, cancellationToken);
        
        if (cluster == null) return null;

        var destination = cluster.Destinations.FirstOrDefault(d => d.DestinationId == destinationId);
        if (destination == null) return null;

        cluster.Destinations.Remove(destination);
        cluster.UpdatedTime = DateTime.UtcNow;
        await _context.SaveChangesAsync(cancellationToken);
        return cluster;
    }
}