using Admin.NET.Core;
using Admin.NET.Plugin.AiDOP.Entity;
using Admin.NET.Plugin.AiDOP.Entity.S0.Warehouse;
using Admin.NET.Plugin.AiDOP.Entity.S8;
using Admin.NET.Plugin.AiDOP.Infrastructure;
using Admin.NET.Plugin.AiDOP.SmartOps;
using Admin.NET.Plugin.AiDOP.Workbench.Dto;
using Admin.NET.Plugin.ApprovalFlow;
using Admin.NET.Plugin.ApprovalFlow.Service;
using Microsoft.Extensions.Logging;

namespace Admin.NET.Plugin.AiDOP.Workbench;

public sealed class AidopWorkbenchService : ITransient
{
    private readonly ISqlSugarClient _db;
    private readonly SmartOpsTrustedScopeResolver _trustedScope;
    private readonly FlowTaskService _flowTasks;
    private readonly ILogger<AidopWorkbenchService> _logger;

    public AidopWorkbenchService(
        ISqlSugarClient db,
        SmartOpsTrustedScopeResolver trustedScope,
        FlowTaskService flowTasks,
        ILogger<AidopWorkbenchService> logger)
    {
        _db = db;
        _trustedScope = trustedScope;
        _flowTasks = flowTasks;
        _logger = logger;
    }

    public async Task<AidopWorkbenchSummaryDto> GetSummaryAsync(int top)
    {
        var scope = await _trustedScope.ResolveAsync();
        top = Math.Clamp(top <= 0 ? 6 : top, 1, 20);
        var dto = new AidopWorkbenchSummaryDto
        {
            GeneratedAt = DateTime.Now.ToString("yyyy-MM-ddTHH:mm:sszzz"),
        };

        dto.ImprovementActions = await SafeSection("improvement", () => LoadImprovementAsync(scope, top, dto.Counts));
        dto.ApprovalTasks = await SafeSection("approval", () => LoadApprovalsAsync(top, dto.Counts));
        dto.S8Tasks = await SafeSection("s8", () => LoadS8Async(scope, top, dto.Counts));
        dto.UnreadNotices = await SafeSection("notice", () => LoadNoticesAsync(scope, top, dto.Counts));
        dto.Pending = MergePending(dto, top);
        dto.Counts.PendingTotal = dto.Pending.Total;
        dto.Initiated = await SafeSection("initiated", () => LoadInitiatedAsync(scope, top, dto.Counts));
        dto.Completed = await SafeSection("completed", () => LoadCompletedAsync(scope, top, dto.Counts));
        return dto;
    }

    private async Task<AidopWorkbenchSectionDto> SafeSection(string name, Func<Task<AidopWorkbenchSectionDto>> factory)
    {
        try
        {
            return await factory();
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex, "工作台分区加载失败 section={Section}", name);
            return new AidopWorkbenchSectionDto
            {
                Available = false,
                ErrorCode = "SECTION_FAILED",
                Message = "该分区暂时不可用",
            };
        }
    }

    private async Task<AidopWorkbenchSectionDto> LoadImprovementAsync(SmartOpsTrustedScope scope, int top, AidopWorkbenchCountsDto counts)
    {
        var today = DateTime.Today;
        var q = _db.Queryable<AdoSmartOpsImprovementAction>()
            .Where(x => x.TenantId == scope.TenantId && x.OwnerUserId == scope.UserId)
            .Where(x => x.Status == SmartOpsImprovementActionStatus.Pending
                        || x.Status == SmartOpsImprovementActionStatus.InProgress);
        var open = await q.Clone().CountAsync();
        var dueSoon = await q.Clone()
            .Where(x => x.DueDate != null && x.DueDate.Value.Date >= today && x.DueDate.Value.Date <= today.AddDays(1))
            .CountAsync();
        var overdue = await q.Clone()
            .Where(x => x.DueDate != null && x.DueDate.Value.Date < today)
            .CountAsync();
        counts.OverdueTotal += overdue;
        counts.DueToday += await q.Clone()
            .Where(x => x.DueDate != null && x.DueDate.Value >= today && x.DueDate.Value < today.AddDays(1))
            .CountAsync();
        counts.ImprovementOpen = open;
        counts.ImprovementDueSoon = dueSoon;
        counts.ImprovementOverdue = overdue;

        var rows = await q.Clone().OrderBy(x => x.DueDate).Take(top).ToListAsync();
        var planIds = rows.Select(x => x.PlanId).Distinct().ToList();
        var plans = planIds.Count == 0
            ? new List<AdoSmartOpsImprovementPlan>()
            : await _db.Queryable<AdoSmartOpsImprovementPlan>()
                .Where(x => x.TenantId == scope.TenantId && planIds.Contains(x.Id))
                .ToListAsync();
        var planMap = plans.ToDictionary(x => x.Id, x => x);

        return new AidopWorkbenchSectionDto
        {
            Total = open,
            Items = rows.Select(x =>
            {
                planMap.TryGetValue(x.PlanId, out var plan);
                return new AidopWorkbenchItemDto
                {
                    Id = x.Id.ToString(),
                    Source = "SmartOpsAction",
                    Title = x.Content,
                    Status = SmartOpsImprovementActionStatus.DisplayStatus(x.Status, x.DueDate, today),
                    DueDate = x.DueDate?.ToString("yyyy-MM-dd"),
                    Overdue = SmartOpsImprovementActionStatus.IsOverdue(x.Status, x.DueDate, today),
                    PlanId = x.PlanId.ToString(),
                    PlanNo = plan?.PlanNo,
                    Category = "改善行动",
                    CreatedAt = x.CreateTime.ToString("yyyy-MM-dd HH:mm"),
                    JumpUrl = $"/aidop/smart-ops/improvement-plans?id={x.PlanId}&actionId={x.Id}",
                };
            }).ToList(),
        };
    }

    private async Task<AidopWorkbenchSectionDto> LoadApprovalsAsync(int top, AidopWorkbenchCountsDto counts)
    {
        counts.ApprovalPending = await _flowTasks.MyPendingCount();
        var page = await _flowTasks.MyPendingPage(new TaskPageInput { Page = 1, PageSize = top });
        return new AidopWorkbenchSectionDto
        {
            Total = counts.ApprovalPending,
            Items = (page.Items ?? new List<TaskPageOutput>()).Select(t => new AidopWorkbenchItemDto
            {
                Id = t.Id.ToString(),
                Source = "Approval",
                Title = string.IsNullOrWhiteSpace(t.Title) ? t.BizType : t.Title,
                Status = "pending",
                Extra = t.BizType,
                Category = "审批",
                CreatedAt = t.CreateTime.ToString("yyyy-MM-dd HH:mm"),
                JumpUrl = ApprovalJumpUrl(t),
            }).ToList(),
        };
    }

    private async Task<AidopWorkbenchSectionDto> LoadS8Async(SmartOpsTrustedScope scope, int top, AidopWorkbenchCountsDto counts)
    {
        var recIds = await _db.Queryable<AdoS0EmployeeMaster>().ClearFilter()
            .Where(x => x.SysUserId == scope.UserId)
            .Select(x => x.Id)
            .ToListAsync();
        if (recIds.Count == 0)
        {
            return new AidopWorkbenchSectionDto
            {
                Available = false,
                ErrorCode = "EMPLOYEE_UNBOUND",
                Message = "当前账号未绑定员工主数据，无法列出个人 S8 事项",
            };
        }

        var assignedQ = _db.Queryable<AdoS8Exception>()
            .Where(x => x.TenantId == scope.TenantId && !x.IsDeleted && recIds.Contains(x.AssigneeId ?? 0))
            .Where(x => x.Status != "CLOSED" && x.Status != "REJECTED" && x.Status != "RECOVERED");
        var verifyQ = _db.Queryable<AdoS8Exception>()
            .Where(x => x.TenantId == scope.TenantId && !x.IsDeleted && recIds.Contains(x.VerifierId ?? 0))
            .Where(x => x.Status == "PENDING_VERIFICATION");
        counts.S8Assigned = await assignedQ.Clone().CountAsync();
        counts.S8Verification = await verifyQ.Clone().CountAsync();
        var today = DateTime.Today;
        counts.DueToday += await _db.Queryable<AdoS8Exception>()
            .Where(x => x.TenantId == scope.TenantId && !x.IsDeleted)
            .Where(x => x.Status != "CLOSED" && x.Status != "REJECTED" && x.Status != "RECOVERED")
            .Where(x => recIds.Contains(x.AssigneeId ?? 0) || recIds.Contains(x.VerifierId ?? 0))
            .Where(x => x.SlaDeadline != null && x.SlaDeadline >= today && x.SlaDeadline < today.AddDays(1))
            .CountAsync();
        counts.OverdueTotal += await _db.Queryable<AdoS8Exception>()
            .Where(x => x.TenantId == scope.TenantId && !x.IsDeleted)
            .Where(x => x.Status != "CLOSED" && x.Status != "REJECTED" && x.Status != "RECOVERED")
            .Where(x => recIds.Contains(x.AssigneeId ?? 0) || recIds.Contains(x.VerifierId ?? 0))
            .Where(x => x.TimeoutFlag || (x.SlaDeadline != null && x.SlaDeadline < DateTime.Now))
            .CountAsync();

        var assigned = await assignedQ.Clone().OrderByDescending(x => x.UpdatedAt ?? x.CreatedAt).Take(top).ToListAsync();
        var verify = await verifyQ.Clone().OrderByDescending(x => x.UpdatedAt ?? x.CreatedAt).Take(top).ToListAsync();
        var merged = assigned.Concat(verify)
            .GroupBy(x => x.Id)
            .Select(g => g.First())
            .Take(top)
            .ToList();

        return new AidopWorkbenchSectionDto
        {
            Total = counts.S8Assigned + counts.S8Verification,
            Items = merged.Select(x => new AidopWorkbenchItemDto
            {
                Id = x.Id.ToString(),
                Source = "S8Exception",
                Title = string.IsNullOrWhiteSpace(x.Title) ? x.ExceptionCode : x.Title,
                Status = x.Status,
                DueDate = x.SlaDeadline?.ToString("yyyy-MM-dd"),
                Overdue = x.TimeoutFlag || (x.SlaDeadline.HasValue && x.SlaDeadline < DateTime.Now && x.Status != "CLOSED"),
                Extra = x.ExceptionCode,
                Category = "异常",
                CreatedAt = x.CreatedAt.ToString("yyyy-MM-dd HH:mm"),
                JumpUrl = $"/aidop/s8/exceptions/{x.Id}",
            }).ToList(),
        };
    }

    private async Task<AidopWorkbenchSectionDto> LoadNoticesAsync(SmartOpsTrustedScope scope, int top, AidopWorkbenchCountsDto counts)
    {
        var q = _db.Queryable<SysNoticeUser>()
            .Includes(u => u.SysNotice)
            .Where(u => u.UserId == scope.UserId && u.ReadStatus == NoticeUserStatusEnum.UNREAD);
        counts.NoticeUnread = await q.Clone().CountAsync();
        var rows = await q.Clone()
            .OrderByDescending(u => u.SysNotice.CreateTime)
            .Take(top)
            .ToListAsync();
        return new AidopWorkbenchSectionDto
        {
            Total = counts.NoticeUnread,
            Items = rows.Where(x => x.SysNotice != null).Select(x => new AidopWorkbenchItemDto
            {
                Id = x.SysNotice.Id.ToString(),
                Source = "SysNotice",
                Title = x.SysNotice.Title,
                Status = "unread",
                Extra = x.SysNotice.PublicTime?.ToString("yyyy-MM-dd HH:mm"),
                Category = "消息",
                CreatedAt = x.SysNotice.CreateTime.ToString("yyyy-MM-dd HH:mm"),
                JumpUrl = $"/dashboard/notice?noticeId={x.SysNotice.Id}",
            }).ToList(),
        };
    }

    private static AidopWorkbenchSectionDto MergePending(AidopWorkbenchSummaryDto dto, int top)
    {
        var sections = new[] { dto.ImprovementActions, dto.ApprovalTasks, dto.S8Tasks };
        var items = sections.SelectMany(x => x.Items)
            .OrderByDescending(x => x.Overdue)
            .ThenBy(x => ParseDate(x.DueDate) ?? DateTime.MaxValue)
            .ThenByDescending(x => ParseDate(x.CreatedAt) ?? DateTime.MinValue)
            .Take(top)
            .ToList();
        return new AidopWorkbenchSectionDto
        {
            Available = sections.Any(x => x.Available),
            Total = sections.Sum(x => x.Total),
            Items = items,
            Message = sections.All(x => !x.Available) ? "待办数据暂时不可用" : null,
        };
    }

    private async Task<AidopWorkbenchSectionDto> LoadInitiatedAsync(
        SmartOpsTrustedScope scope,
        int top,
        AidopWorkbenchCountsDto counts)
    {
        var actionPlanIds = await _db.Queryable<AdoSmartOpsImprovementAction>()
            .Where(x => x.TenantId == scope.TenantId && x.CreateUserId == scope.UserId)
            .Select(x => x.PlanId)
            .Distinct()
            .ToListAsync();
        var planCount = actionPlanIds.Count;
        var plans = actionPlanIds.Count == 0
            ? new List<AdoSmartOpsImprovementPlan>()
            : await _db.Queryable<AdoSmartOpsImprovementPlan>()
                .Where(x => x.TenantId == scope.TenantId && actionPlanIds.Contains(x.Id))
                .OrderByDescending(x => x.CreateTime)
                .Take(top)
                .ToListAsync();

        var recIds = await ResolveEmployeeIds(scope.UserId);
        var reportedQ = _db.Queryable<AdoS8Exception>()
            .Where(x => x.TenantId == scope.TenantId && !x.IsDeleted && recIds.Contains(x.ReporterId ?? 0));
        var reportedCount = recIds.Count == 0 ? 0 : await reportedQ.Clone().CountAsync();
        var reported = recIds.Count == 0
            ? new List<AdoS8Exception>()
            : await reportedQ.Clone().OrderByDescending(x => x.CreatedAt).Take(top).ToListAsync();

        var flowQ = _db.Queryable<ApprovalFlowInstance>()
            .Where(x => x.InitiatorId == scope.UserId)
            .Where(x => x.BizType != "SMART_OPS_IMPROVEMENT" && !x.BizType.StartsWith("EXCEPTION_"));
        var flowCount = await flowQ.Clone().CountAsync();
        var flows = await flowQ.Clone().OrderByDescending(x => x.StartTime).Take(top).ToListAsync();

        var items = plans.Select(x => new AidopWorkbenchItemDto
            {
                Id = x.Id.ToString(),
                Source = "ImprovementPlan",
                Category = "改善计划",
                Title = string.IsNullOrWhiteSpace(x.ProblemName) ? x.PlanNo : x.ProblemName,
                Status = x.Status,
                DueDate = x.DueDate?.ToString("yyyy-MM-dd"),
                PlanId = x.Id.ToString(),
                PlanNo = x.PlanNo,
                CreatedAt = x.CreateTime.ToString("yyyy-MM-dd HH:mm"),
                JumpUrl = $"/aidop/smart-ops/improvement-plans?id={x.Id}",
            })
            .Concat(reported.Select(x => new AidopWorkbenchItemDto
            {
                Id = x.Id.ToString(),
                Source = "S8Reported",
                Category = "异常提报",
                Title = string.IsNullOrWhiteSpace(x.Title) ? x.ExceptionCode : x.Title,
                Status = x.Status,
                DueDate = x.SlaDeadline?.ToString("yyyy-MM-dd"),
                Extra = x.ExceptionCode,
                CreatedAt = x.CreatedAt.ToString("yyyy-MM-dd HH:mm"),
                JumpUrl = $"/aidop/s8/exceptions/{x.Id}",
            }))
            .Concat(flows.Select(x => new AidopWorkbenchItemDto
            {
                Id = x.Id.ToString(),
                Source = "ApprovalInitiated",
                Category = "审批发起",
                Title = x.Title,
                Status = x.Status.ToString(),
                Extra = x.BizType,
                CreatedAt = x.StartTime.ToString("yyyy-MM-dd HH:mm"),
                CompletedAt = x.EndTime?.ToString("yyyy-MM-dd HH:mm"),
                JumpUrl = "/aidop/flowManage/approvalFlowCenter",
            }))
            .OrderByDescending(x => ParseDate(x.CreatedAt) ?? DateTime.MinValue)
            .Take(top)
            .ToList();

        counts.InitiatedTotal = planCount + reportedCount + flowCount;
        return new AidopWorkbenchSectionDto { Total = counts.InitiatedTotal, Items = items };
    }

    private async Task<AidopWorkbenchSectionDto> LoadCompletedAsync(
        SmartOpsTrustedScope scope,
        int top,
        AidopWorkbenchCountsDto counts)
    {
        var actionsQ = _db.Queryable<AdoSmartOpsImprovementAction>()
            .Where(x => x.TenantId == scope.TenantId && x.OwnerUserId == scope.UserId)
            .Where(x => x.Status == SmartOpsImprovementActionStatus.Completed);
        var actionCount = await actionsQ.Clone().CountAsync();
        var actions = await actionsQ.Clone()
            .OrderByDescending(x => x.CompletedAt ?? x.UpdateTime)
            .Take(top)
            .ToListAsync();

        var recIds = await ResolveEmployeeIds(scope.UserId);
        var closedQ = _db.Queryable<AdoS8Exception>()
            .Where(x => x.TenantId == scope.TenantId && !x.IsDeleted)
            .Where(x => x.Status == "CLOSED" || x.Status == "REJECTED" || x.Status == "RECOVERED")
            .Where(x => recIds.Contains(x.AssigneeId ?? 0) || recIds.Contains(x.VerifierId ?? 0));
        var closedCount = recIds.Count == 0 ? 0 : await closedQ.Clone().CountAsync();
        var closed = recIds.Count == 0
            ? new List<AdoS8Exception>()
            : await closedQ.Clone().OrderByDescending(x => x.ClosedAt ?? x.UpdatedAt).Take(top).ToListAsync();

        var donePage = await _flowTasks.MyDonePage(new TaskPageInput { Page = 1, PageSize = top });
        var doneCount = donePage.Total;
        var done = donePage.Items ?? new List<TaskPageOutput>();

        var items = actions.Select(x => new AidopWorkbenchItemDto
            {
                Id = x.Id.ToString(),
                Source = "SmartOpsActionCompleted",
                Category = "改善行动",
                Title = x.Content,
                Status = x.Status,
                DueDate = x.DueDate?.ToString("yyyy-MM-dd"),
                PlanId = x.PlanId.ToString(),
                CompletedAt = (x.CompletedAt ?? x.UpdateTime).ToString("yyyy-MM-dd HH:mm"),
                JumpUrl = $"/aidop/smart-ops/improvement-plans?id={x.PlanId}&actionId={x.Id}",
            })
            .Concat(closed.Select(x => new AidopWorkbenchItemDto
            {
                Id = x.Id.ToString(),
                Source = "S8Completed",
                Category = "异常",
                Title = string.IsNullOrWhiteSpace(x.Title) ? x.ExceptionCode : x.Title,
                Status = x.Status,
                Extra = x.ExceptionCode,
                CompletedAt = (x.ClosedAt ?? x.UpdatedAt ?? x.CreatedAt).ToString("yyyy-MM-dd HH:mm"),
                JumpUrl = $"/aidop/s8/exceptions/{x.Id}",
            }))
            .Concat(done.Select(x => new AidopWorkbenchItemDto
            {
                Id = x.Id.ToString(),
                Source = "ApprovalCompleted",
                Category = "审批",
                Title = string.IsNullOrWhiteSpace(x.Title) ? x.BizType : x.Title,
                Status = x.Status.ToString(),
                Extra = x.BizType,
                CompletedAt = x.ActionTime?.ToString("yyyy-MM-dd HH:mm"),
                JumpUrl = ApprovalJumpUrl(x),
            }))
            .OrderByDescending(x => ParseDate(x.CompletedAt) ?? DateTime.MinValue)
            .Take(top)
            .ToList();

        counts.CompletedTotal = actionCount + closedCount + doneCount;
        return new AidopWorkbenchSectionDto { Total = counts.CompletedTotal, Items = items };
    }

    private async Task<List<long>> ResolveEmployeeIds(long userId)
    {
        return await _db.Queryable<AdoS0EmployeeMaster>().ClearFilter()
            .Where(x => x.SysUserId == userId)
            .Select(x => x.Id)
            .ToListAsync();
    }

    private static DateTime? ParseDate(string? value) =>
        DateTime.TryParse(value, out var parsed) ? parsed : null;

    private static string ApprovalJumpUrl(TaskPageOutput t)
    {
        var bizType = t.BizType ?? "";
        if (bizType.StartsWith("EXCEPTION", StringComparison.OrdinalIgnoreCase) && t.BizId > 0)
            return $"/aidop/s8/exceptions/{t.BizId}";
        if (string.Equals(bizType, "SMART_OPS_IMPROVEMENT", StringComparison.OrdinalIgnoreCase) && t.BizId > 0)
            return $"/aidop/smart-ops/improvement-plans?id={t.BizId}";
        return $"/aidop/flowManage/approvalFlowCenter?taskId={t.Id}";
    }
}