using Admin.NET.Core.Service;
using Microsoft.AspNetCore.SignalR;

namespace Admin.NET.Plugin.ApprovalFlow.Service;

/// <summary>
/// 审批流通知渠道配置服务（P4-16 延伸）
/// - 对外：List / Save（管理页使用） + TestSend（向当前登录用户发一条 SignalR 测试通知）
/// - 对内：GetEffectiveAsync() → NotifyChannelConfig，供 FlowNotifyService 调用
///   DB 有记录则以 DB 为准，无记录回退 ApprovalFlow.json（零破坏升级）
/// </summary>
[ApiDescriptionSettings(ApprovalFlowConst.GroupName, Order = 57)]
public class FlowNotifyConfigService : IDynamicApiController, ITransient
{
    private readonly SqlSugarRepository<ApprovalFlowNotifyConfig> _rep;
    private readonly SysCacheService _cache;
    private readonly IHubContext<OnlineUserHub, IOnlineUserHub> _hubContext;
    private readonly UserManager _userManager;

    private const string CacheKey = "ApprovalFlow:NotifyConfig:All";

    public FlowNotifyConfigService(
        SqlSugarRepository<ApprovalFlowNotifyConfig> rep,
        SysCacheService cache,
        IHubContext<OnlineUserHub, IOnlineUserHub> hubContext,
        UserManager userManager)
    {
        _rep = rep;
        _cache = cache;
        _hubContext = hubContext;
        _userManager = userManager;
    }

    private static readonly string[] AllChannels = { "SignalR", "Email", "Sms", "DingTalk", "WorkWeixin" };

    /// <summary>
    /// 获取全部渠道配置（DB 中缺失的渠道用 ApprovalFlow.json 兜底值回填到返回结果）
    /// </summary>
    [HttpGet]
    [ApiDescriptionSettings(Name = "List")]
    [DisplayName("获取通知渠道配置")]
    public async Task<List<NotifyChannelConfigOutput>> List()
    {
        var dbRows = await _rep.AsQueryable().ToListAsync();
        var jsonCfg = App.GetConfig<NotifyChannelConfig>("ApprovalFlow:Notify") ?? new NotifyChannelConfig();

        var result = new List<NotifyChannelConfigOutput>();
        foreach (var ch in AllChannels)
        {
            var row = dbRows.FirstOrDefault(r => r.ChannelKey == ch);
            if (row != null)
            {
                result.Add(new NotifyChannelConfigOutput
                {
                    Id = row.Id,
                    ChannelKey = row.ChannelKey,
                    Enabled = row.Enabled,
                    WebhookUrl = row.WebhookUrl,
                    Secret = row.Secret,
                    TemplateId = row.TemplateId,
                    Remark = row.Remark,
                    Source = "DB",
                });
            }
            else
            {
                result.Add(new NotifyChannelConfigOutput
                {
                    Id = 0,
                    ChannelKey = ch,
                    Enabled = ch switch
                    {
                        "SignalR" => jsonCfg.SignalR,
                        "Email" => jsonCfg.Email,
                        "Sms" => jsonCfg.Sms,
                        "DingTalk" => jsonCfg.DingTalk,
                        "WorkWeixin" => jsonCfg.WorkWeixin,
                        _ => false,
                    },
                    WebhookUrl = ch switch
                    {
                        "DingTalk" => jsonCfg.DingTalkWebhookUrl,
                        "WorkWeixin" => jsonCfg.WorkWeixinWebhookUrl,
                        _ => null,
                    },
                    Secret = ch == "DingTalk" ? jsonCfg.DingTalkSecret : null,
                    TemplateId = ch == "Sms" ? jsonCfg.SmsTemplateId : null,
                    Remark = null,
                    Source = "JSON",
                });
            }
        }
        return result;
    }

    /// <summary>
    /// 保存某渠道配置（Upsert），保存后缓存失效，立即对 FlowNotifyService 生效
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "Save")]
    [DisplayName("保存通知渠道配置")]
    public async Task<long> Save(NotifyChannelConfigSaveInput input)
    {
        if (string.IsNullOrWhiteSpace(input.ChannelKey) || !AllChannels.Contains(input.ChannelKey))
            throw Oops.Oh($"无效渠道标识：{input.ChannelKey}");

        var entity = await _rep.AsQueryable().FirstAsync(r => r.ChannelKey == input.ChannelKey);
        if (entity == null)
        {
            entity = new ApprovalFlowNotifyConfig
            {
                ChannelKey = input.ChannelKey,
                Enabled = input.Enabled,
                WebhookUrl = input.WebhookUrl,
                Secret = input.Secret,
                TemplateId = input.TemplateId,
                Remark = input.Remark,
            };
            await _rep.InsertAsync(entity);
        }
        else
        {
            entity.Enabled = input.Enabled;
            entity.WebhookUrl = input.WebhookUrl;
            entity.Secret = input.Secret;
            entity.TemplateId = input.TemplateId;
            entity.Remark = input.Remark;
            await _rep.UpdateAsync(entity);
        }

        InvalidateCache();
        return entity.Id;
    }

    /// <summary>
    /// 向当前登录用户发一条 SignalR 站内测试通知，便于管理员快速验证链路
    /// （本轮仅覆盖 SignalR；外部渠道待需求明确后再加）
    /// </summary>
    [HttpPost]
    [ApiDescriptionSettings(Name = "TestSend")]
    [DisplayName("发送测试通知")]
    public async Task<bool> TestSend()
    {
        var uid = _userManager.UserId;
        var onlineUsers = _cache.HashGetAll<SysOnlineUser>(CacheConst.KeyUserOnline);
        var connectionIds = onlineUsers
            .Where(u => u.Value.UserId == uid)
            .Select(u => u.Value.ConnectionId)
            .ToList();
        if (connectionIds.Count == 0) return false;

        await _hubContext.Clients.Clients(connectionIds).ReceiveMessage(new
        {
            title = "【测试通知】审批流通知渠道连通性",
            message = "这是一条管理员主动触发的测试通知，当前连接收到即表示 SignalR 站内消息链路通畅。",
            type = FlowNotificationTypeEnum.Urge.ToString(),
            instanceId = 0L,
        });
        return true;
    }

    // ═══════════════════════════════════════════
    //  内部：向 FlowNotifyService 提供有效配置
    // ═══════════════════════════════════════════

    [NonAction]
    public async Task<NotifyChannelConfig> GetEffectiveAsync()
    {
        var cached = _cache.Get<NotifyChannelConfig>(CacheKey);
        if (cached != null) return cached;

        var jsonCfg = App.GetConfig<NotifyChannelConfig>("ApprovalFlow:Notify") ?? new NotifyChannelConfig();
        var dbRows = await _rep.AsQueryable().ToListAsync();

        var cfg = new NotifyChannelConfig
        {
            SignalR = Pick(dbRows, "SignalR", r => r.Enabled, jsonCfg.SignalR),
            Email = Pick(dbRows, "Email", r => r.Enabled, jsonCfg.Email),
            Sms = Pick(dbRows, "Sms", r => r.Enabled, jsonCfg.Sms),
            DingTalk = Pick(dbRows, "DingTalk", r => r.Enabled, jsonCfg.DingTalk),
            WorkWeixin = Pick(dbRows, "WorkWeixin", r => r.Enabled, jsonCfg.WorkWeixin),

            DingTalkWebhookUrl = PickStr(dbRows, "DingTalk", r => r.WebhookUrl, jsonCfg.DingTalkWebhookUrl),
            DingTalkSecret = PickStr(dbRows, "DingTalk", r => r.Secret, jsonCfg.DingTalkSecret),
            WorkWeixinWebhookUrl = PickStr(dbRows, "WorkWeixin", r => r.WebhookUrl, jsonCfg.WorkWeixinWebhookUrl),
            SmsTemplateId = PickStr(dbRows, "Sms", r => r.TemplateId, jsonCfg.SmsTemplateId),
        };

        _cache.Set(CacheKey, cfg, TimeSpan.FromMinutes(10));
        return cfg;
    }

    [NonAction]
    public void InvalidateCache() => _cache.Remove(CacheKey);

    private static bool Pick(List<ApprovalFlowNotifyConfig> rows, string key,
        Func<ApprovalFlowNotifyConfig, bool> selector, bool fallback)
    {
        var row = rows.FirstOrDefault(r => r.ChannelKey == key);
        return row != null ? selector(row) : fallback;
    }

    private static string? PickStr(List<ApprovalFlowNotifyConfig> rows, string key,
        Func<ApprovalFlowNotifyConfig, string?> selector, string? fallback)
    {
        var row = rows.FirstOrDefault(r => r.ChannelKey == key);
        return row != null ? selector(row) : fallback;
    }
}

public class NotifyChannelConfigOutput
{
    public long Id { get; set; }
    public string ChannelKey { get; set; } = "";
    public bool Enabled { get; set; }
    public string? WebhookUrl { get; set; }
    public string? Secret { get; set; }
    public string? TemplateId { get; set; }
    public string? Remark { get; set; }
    /// <summary>数据来源：DB（已保存过）/ JSON（未保存过，返回兜底值）</summary>
    public string Source { get; set; } = "";
}

public class NotifyChannelConfigSaveInput
{
    [Required, MaxLength(16)]
    public string ChannelKey { get; set; } = "";
    public bool Enabled { get; set; }
    [MaxLength(512)]
    public string? WebhookUrl { get; set; }
    [MaxLength(128)]
    public string? Secret { get; set; }
    [MaxLength(64)]
    public string? TemplateId { get; set; }
    [MaxLength(256)]
    public string? Remark { get; set; }
}