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

namespace Admin.NET.Plugin.AiDOP.Service.S8;

public class S8TaskFlowService : ITransient
{
    private readonly SqlSugarRepository<AdoS8Exception> _rep;
    private readonly SqlSugarRepository<AdoS8ExceptionTimeline> _timelineRep;
    private readonly SqlSugarRepository<AdoS0EmployeeMaster> _employeeRep;
    private readonly SqlSugarRepository<ApprovalFlowInstance> _flowInstanceRep;
    private readonly SqlSugarRepository<ApprovalFlowTask> _flowTaskRep;
    private readonly FlowEngineService _flowEngine;
    private readonly UserManager _userManager;
    private readonly ILogger<S8TaskFlowService> _logger;

    public S8TaskFlowService(
        SqlSugarRepository<AdoS8Exception> rep,
        SqlSugarRepository<AdoS8ExceptionTimeline> timelineRep,
        SqlSugarRepository<AdoS0EmployeeMaster> employeeRep,
        SqlSugarRepository<ApprovalFlowInstance> flowInstanceRep,
        SqlSugarRepository<ApprovalFlowTask> flowTaskRep,
        FlowEngineService flowEngine,
        UserManager userManager,
        ILogger<S8TaskFlowService> logger)
    {
        _rep = rep;
        _timelineRep = timelineRep;
        _employeeRep = employeeRep;
        _flowInstanceRep = flowInstanceRep;
        _flowTaskRep = flowTaskRep;
        _flowEngine = flowEngine;
        _userManager = userManager;
        _logger = logger;
    }

    public async Task<AdoS8Exception> ClaimAsync(long id, long tenantId, long factoryId, long assigneeId, string? remark)
    {
        if (assigneeId <= 0) throw new S8BizException("认领需指定处理人 AssigneeId");
        var e = await LoadAsync(id, tenantId, factoryId) ?? throw new S8BizException("异常不存在");
        if (!S8StatusRules.IsAllowedTransition(e.Status, "ASSIGNED"))
            throw new S8BizException($"状态 {e.Status} 不可认领");

        var fromStatus = e.Status;
        e.Status = "ASSIGNED";
        e.AssigneeId = assigneeId;
        e.AssignedAt = DateTime.Now;
        e.UpdatedAt = DateTime.Now;

        await _rep.AsTenant().UseTranAsync(async () =>
        {
            await _rep.UpdateAsync(e);
            await InsertTimelineAsync(e.Id, "CLAIM", "认领", fromStatus, "ASSIGNED", assigneeId, null, remark);
        }, ex => throw ex);

        // 注：认领仅承接异常，不视为审批流完成。审批流的"通过"在"开始处理"那一步触发。
        return e;
    }

    public async Task<AdoS8Exception> TransferAsync(long id, long tenantId, long factoryId, long newAssigneeId, string? remark)
    {
        var allowedStatuses = new HashSet<string> { "ASSIGNED", "IN_PROGRESS" };
        if (newAssigneeId <= 0) throw new S8BizException("转派目标无效");
        var e = await LoadAsync(id, tenantId, factoryId) ?? throw new S8BizException("异常不存在");
        if (e.ActiveFlowInstanceId.HasValue)
            throw new S8BizException("审批进行中不可转派");
        if (e.Status == "ESCALATED")
            throw new S8BizException("升级审批中不可转派");
        if (S8StatusRules.IsTerminal(e.Status))
            throw new S8BizException("已关闭不可转派");
        if (!allowedStatuses.Contains(e.Status))
            throw new S8BizException($"状态 {e.Status} 不可转派");

        e.AssigneeId = newAssigneeId;
        e.UpdatedAt = DateTime.Now;

        await _rep.AsTenant().UseTranAsync(async () =>
        {
            await _rep.UpdateAsync(e);
            await InsertTimelineAsync(e.Id, "TRANSFER", "转派", e.Status, e.Status, newAssigneeId, null, remark);
        }, ex => throw ex);

        // 双线合一：S8 转派 = TB001 任务转办给新处理人。
        await TryTransferIntakeOnTransferAsync(e.Id, newAssigneeId, remark);

        return e;
    }

    private async Task TryTransferIntakeOnTransferAsync(long exceptionId, long newAssigneeRecId, string? remark)
    {
        try
        {
            var instance = await _flowInstanceRep.AsQueryable()
                .Where(x => x.BizType == "EXCEPTION_REPORT"
                            && x.BizId == exceptionId
                            && x.Status == FlowInstanceStatusEnum.Running)
                .FirstAsync();
            if (instance == null) return;

            var currentUserId = _userManager.UserId;
            var task = await _flowTaskRep.AsQueryable()
                .Where(x => x.InstanceId == instance.Id
                            && x.AssigneeId == currentUserId
                            && x.Status == FlowTaskStatusEnum.Pending)
                .FirstAsync();
            if (task == null) return;

            // newAssigneeRecId 是 EmployeeMaster.RecID；FlowEngine.Transfer 要 SysUser.UserId。
            var targetSysUserId = await _employeeRep.AsQueryable().ClearFilter()
                .Where(x => x.Id == newAssigneeRecId && x.SysUserId != null)
                .Select(x => x.SysUserId)
                .FirstAsync();
            if (targetSysUserId == null || targetSysUserId == 0)
            {
                _logger.LogWarning(
                    "S8 转派联动审批流跳过：员工 {RecId} 未绑定 SysUser，TB001 任务保留原 assignee",
                    newAssigneeRecId);
                return;
            }

            await _flowEngine.Transfer(task.Id, targetSysUserId.Value, remark ?? "S8 转派（双线合一自动转办）");
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex,
                "S8 转派时自动转办 TB001 任务失败 exceptionId={Id} newAssigneeRecId={AssigneeId}",
                exceptionId, newAssigneeRecId);
        }
    }

    public async Task<AdoS8Exception> StartProgressAsync(long id, long tenantId, long factoryId, string? remark)
    {
        var currentUserId = GetCurrentUserId();
        var e = await LoadAsync(id, tenantId, factoryId) ?? throw new S8BizException("异常不存在");
        if (!S8StatusRules.IsAllowedTransition(e.Status, "IN_PROGRESS"))
            throw new S8BizException($"状态 {e.Status} 不可开始处理");

        var fromStatus = e.Status;
        e.Status = "IN_PROGRESS";
        e.UpdatedAt = DateTime.Now;

        await _rep.AsTenant().UseTranAsync(async () =>
        {
            await _rep.UpdateAsync(e);
            await InsertTimelineAsync(e.Id, "START_PROGRESS", "开始处理", fromStatus, "IN_PROGRESS", currentUserId, null, remark);
        }, ex => throw ex);

        // 双线合一：开始处理 = TB001 异常提报审批通过。
        // 当前用户必须是 TB001 task 的 AssigneeId，FlowEngine 强校验。
        await TryApproveIntakeOnStartProgressAsync(e.Id, currentUserId);

        return e;
    }

    private async Task TryApproveIntakeOnStartProgressAsync(long exceptionId, long currentUserId)
    {
        try
        {
            var instance = await _flowInstanceRep.AsQueryable()
                .Where(x => x.BizType == "EXCEPTION_REPORT"
                            && x.BizId == exceptionId
                            && x.Status == FlowInstanceStatusEnum.Running)
                .FirstAsync();
            if (instance == null) return;

            var task = await _flowTaskRep.AsQueryable()
                .Where(x => x.InstanceId == instance.Id
                            && x.AssigneeId == currentUserId
                            && x.Status == FlowTaskStatusEnum.Pending)
                .FirstAsync();
            if (task == null) return;

            await _flowEngine.Approve(task.Id, "S8 已开始处理（双线合一自动同意）");
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex,
                "S8 开始处理时自动同意 TB001 任务失败 exceptionId={Id} userId={UserId}",
                exceptionId, currentUserId);
        }
    }

    public async Task<AdoS8Exception> UpgradeAsync(long id, long tenantId, long factoryId, string? remark)
    {
        var e = await LoadAsync(id, tenantId, factoryId) ?? throw new S8BizException("异常不存在");

        if (e.ActiveFlowInstanceId.HasValue)
            throw new S8BizException("该异常已有进行中的审批流程，请等待审批完成");

        if (!S8StatusRules.IsAllowedTransition(e.Status, "ESCALATED"))
            throw new S8BizException($"状态 {e.Status} 不可升级");

        await _flowEngine.StartFlow(new StartFlowInput
        {
            BizType = "EXCEPTION_ESCALATION",
            BizId = e.Id,
            Title = $"异常升级审批 - {e.ExceptionCode}",
            Comment = remark,
            BizData = new Dictionary<string, object>
            {
                ["severity"] = e.Severity,
                ["sceneCode"] = e.SceneCode,
                ["priorityLevel"] = e.PriorityLevel,
            }
        });

        // 状态和时间线由 ExceptionEscalationBizHandler.OnFlowStarted 回调更新
        return await LoadAsync(id, tenantId, factoryId) ?? e;
    }

    public async Task<AdoS8Exception> RejectAsync(long id, long tenantId, long factoryId, string? remark)
    {
        var e = await LoadAsync(id, tenantId, factoryId) ?? throw new S8BizException("异常不存在");
        if (!S8StatusRules.IsAllowedTransition(e.Status, "REJECTED"))
            throw new S8BizException($"状态 {e.Status} 不可驳回");

        var from = e.Status;
        e.Status = "REJECTED";
        e.UpdatedAt = DateTime.Now;

        await _rep.AsTenant().UseTranAsync(async () =>
        {
            await _rep.UpdateAsync(e);
            await InsertTimelineAsync(e.Id, "REJECT", "驳回", from, "REJECTED", null, null, remark);
        }, ex => throw ex);

        // 双线合一：S8 驳回 = TB001 流程整体拒绝（取消所有 pending 任务、Instance 终止）。
        await TryRejectIntakeOnRejectAsync(e.Id, remark);

        return e;
    }

    private async Task TryRejectIntakeOnRejectAsync(long exceptionId, string? remark)
    {
        try
        {
            var instance = await _flowInstanceRep.AsQueryable()
                .Where(x => x.BizType == "EXCEPTION_REPORT"
                            && x.BizId == exceptionId
                            && x.Status == FlowInstanceStatusEnum.Running)
                .FirstAsync();
            if (instance == null) return;

            var currentUserId = _userManager.UserId;
            var task = await _flowTaskRep.AsQueryable()
                .Where(x => x.InstanceId == instance.Id
                            && x.AssigneeId == currentUserId
                            && x.Status == FlowTaskStatusEnum.Pending)
                .FirstAsync();
            if (task == null) return;

            await _flowEngine.Reject(task.Id, remark ?? "S8 已驳回（双线合一自动拒绝）");
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex,
                "S8 驳回时自动拒绝 TB001 流程失败 exceptionId={Id}",
                exceptionId);
        }
    }

    public async Task<AdoS8Exception> SubmitVerificationAsync(
        long id, long tenantId, long factoryId,
        long verifierId, string? remark)
    {
        var currentUserId = GetCurrentUserId();
        var e = await LoadAsync(id, tenantId, factoryId) ?? throw new S8BizException("异常不存在");
        await EnsureCurrentUserIsOperatorAsync(e.AssigneeId, currentUserId,
            "只有当前处理人才能提交复检（或当前账号未绑定员工主数据）");
        if (verifierId <= 0)
            throw new S8BizException("请选择检验人");
        if (!S8StatusRules.IsAllowedTransition(e.Status, "PENDING_VERIFICATION"))
            throw new S8BizException($"状态 {e.Status} 不可提交复检");

        var from = e.Status;
        e.Status = "PENDING_VERIFICATION";
        e.VerifierId = verifierId;
        e.VerificationAssignedAt = DateTime.Now;
        e.UpdatedAt = DateTime.Now;

        await _rep.AsTenant().UseTranAsync(async () =>
        {
            await _rep.UpdateAsync(e);
            await InsertTimelineAsync(e.Id, "VERIFY_SUBMITTED", "提交复检", from, "PENDING_VERIFICATION",
                currentUserId, null, remark);
        }, ex => throw ex);

        // 双线合一：提交复检 = 启动 EXCEPTION_CLOSURE 流程，指派检验人。
        // 该流程定义复用，作为复检/关闭确认通用审批载体；handler 只做 ActiveFlowInstanceId 维护。
        await TryStartVerificationFlowAsync(e, verifierId, remark);

        return await LoadAsync(id, tenantId, factoryId) ?? e;
    }

    private async Task TryStartVerificationFlowAsync(AdoS8Exception e, long verifierRecId, string? remark)
    {
        try
        {
            await _flowEngine.StartFlow(new StartFlowInput
            {
                BizType = "EXCEPTION_CLOSURE",
                BizId = e.Id,
                BizNo = e.ExceptionCode,
                Title = $"异常复检 - {e.ExceptionCode}",
                Comment = remark,
                BizData = new Dictionary<string, object>
                {
                    ["sceneCode"] = e.SceneCode ?? string.Empty,
                    ["verifierRecId"] = verifierRecId,
                }
            });
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex,
                "S8 提交复检时启动 EXCEPTION_CLOSURE 流程失败 exceptionId={Id} verifierRecId={VerifierId}",
                e.Id, verifierRecId);
        }
    }

    public async Task<AdoS8Exception> ApproveVerificationAsync(
        long id, long tenantId, long factoryId,
        string? remark)
    {
        var currentUserId = GetCurrentUserId();
        var e = await LoadAsync(id, tenantId, factoryId) ?? throw new S8BizException("异常不存在");
        await EnsureCurrentUserIsOperatorAsync(e.VerifierId, currentUserId,
            "只有指定检验人才能检验通过（或当前账号未绑定员工主数据）");
        if (!S8StatusRules.IsAllowedTransition(e.Status, "CLOSED"))
            throw new S8BizException($"状态 {e.Status} 不可检验通过");

        var from = e.Status;
        e.Status = "CLOSED";
        e.VerifiedAt = DateTime.Now;
        e.VerificationResult = "APPROVED";
        e.VerificationRemark = remark;
        e.ClosedAt = DateTime.Now;
        e.UpdatedAt = DateTime.Now;

        await _rep.AsTenant().UseTranAsync(async () =>
        {
            await _rep.UpdateAsync(e);
            await InsertTimelineAsync(e.Id, "VERIFY_APPROVED", "检验通过", from, "CLOSED",
                currentUserId, null, remark);
        }, ex => throw ex);

        // 双线合一：检验通过 = EXCEPTION_CLOSURE 复检流程审批通过。
        await TryApproveVerificationFlowAsync(e.Id, currentUserId);

        return e;
    }

    private async Task TryApproveVerificationFlowAsync(long exceptionId, long currentUserId)
    {
        try
        {
            var instance = await _flowInstanceRep.AsQueryable()
                .Where(x => x.BizType == "EXCEPTION_CLOSURE"
                            && x.BizId == exceptionId
                            && x.Status == FlowInstanceStatusEnum.Running)
                .FirstAsync();
            if (instance == null) return;

            var task = await _flowTaskRep.AsQueryable()
                .Where(x => x.InstanceId == instance.Id
                            && x.AssigneeId == currentUserId
                            && x.Status == FlowTaskStatusEnum.Pending)
                .FirstAsync();
            if (task == null) return;

            await _flowEngine.Approve(task.Id, "S8 检验通过（双线合一自动同意）");
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex,
                "S8 检验通过时自动同意 EXCEPTION_CLOSURE 流程失败 exceptionId={Id} userId={UserId}",
                exceptionId, currentUserId);
        }
    }

    public async Task<AdoS8Exception> RejectVerificationAsync(
        long id, long tenantId, long factoryId,
        string remark)
    {
        var currentUserId = GetCurrentUserId();
        var e = await LoadAsync(id, tenantId, factoryId) ?? throw new S8BizException("异常不存在");
        await EnsureCurrentUserIsOperatorAsync(e.VerifierId, currentUserId,
            "只有指定检验人才能检验退回（或当前账号未绑定员工主数据）");
        if (!S8StatusRules.IsAllowedTransition(e.Status, "IN_PROGRESS"))
            throw new S8BizException($"状态 {e.Status} 不可检验退回");
        if (string.IsNullOrWhiteSpace(remark))
            throw new S8BizException("检验退回必须填写退回原因");

        var from = e.Status;
        e.Status = "IN_PROGRESS";
        e.VerifiedAt = DateTime.Now;
        e.VerificationResult = "REJECTED";
        e.VerificationRemark = remark;
        e.UpdatedAt = DateTime.Now;

        await _rep.AsTenant().UseTranAsync(async () =>
        {
            await _rep.UpdateAsync(e);
            await InsertTimelineAsync(e.Id, "VERIFY_REJECTED", "检验退回", from, "IN_PROGRESS",
                currentUserId, null, remark);
        }, ex => throw ex);

        // 双线合一：检验退回 = EXCEPTION_CLOSURE 复检流程整体拒绝。
        await TryRejectVerificationFlowAsync(e.Id, currentUserId, remark);

        return e;
    }

    private async Task TryRejectVerificationFlowAsync(long exceptionId, long currentUserId, string? remark)
    {
        try
        {
            var instance = await _flowInstanceRep.AsQueryable()
                .Where(x => x.BizType == "EXCEPTION_CLOSURE"
                            && x.BizId == exceptionId
                            && x.Status == FlowInstanceStatusEnum.Running)
                .FirstAsync();
            if (instance == null) return;

            var task = await _flowTaskRep.AsQueryable()
                .Where(x => x.InstanceId == instance.Id
                            && x.AssigneeId == currentUserId
                            && x.Status == FlowTaskStatusEnum.Pending)
                .FirstAsync();
            if (task == null) return;

            await _flowEngine.Reject(task.Id, remark ?? "S8 检验退回（双线合一自动拒绝）");
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex,
                "S8 检验退回时自动拒绝 EXCEPTION_CLOSURE 流程失败 exceptionId={Id} userId={UserId}",
                exceptionId, currentUserId);
        }
    }

    public async Task CommentAsync(long id, string? remark)
    {
        var e = await _rep.GetFirstAsync(x => x.Id == id && !x.IsDeleted)
            ?? throw new S8BizException("异常不存在");
        await InsertTimelineAsync(e.Id, "COMMENT", "补充说明", e.Status, e.Status, null, null, remark);
    }

    private Task<AdoS8Exception?> LoadAsync(long id, long tenantId, long factoryId) =>
        _rep.GetFirstAsync(x => x.Id == id && x.TenantId == tenantId && x.FactoryId == factoryId && !x.IsDeleted);

    // 统一复用框架登录上下文，避免业务身份继续信任前端传参。
    private long GetCurrentUserId()
    {
        var currentUserId = _userManager.UserId;
        if (currentUserId <= 0)
            throw new S8BizException("未获取到当前登录用户");

        return currentUserId;
    }

    // 把异常上的处理人/检验人(employeeId) 经 EmployeeMaster.SysUserId 解析到系统账号 ID。
    // EmployeeMaster.tenant_id 与 SysUser.TenantId 历史错位，必须 ClearFilter 跳过多租户全局 filter；
    // 通过 employee.Id 主键精确查询作为安全边界，无跨租户泄漏风险。
    private async Task<long?> GetEmployeeSysUserIdAsync(long? employeeId)
    {
        if (!employeeId.HasValue || employeeId.Value <= 0) return null;
        var emp = await _employeeRep.AsQueryable().ClearFilter()
            .Where(x => x.Id == employeeId.Value)
            .FirstAsync();
        return emp?.SysUserId;
    }

    // 鉴权统一入口：要求当前登录用户必须是 employeeId 解析后的 SysUserId。
    private async Task EnsureCurrentUserIsOperatorAsync(long? employeeId, long currentUserId, string failMessage)
    {
        var ownerSysUserId = await GetEmployeeSysUserIdAsync(employeeId);
        if (ownerSysUserId != currentUserId)
            throw new S8BizException(failMessage);
    }

    private async Task InsertTimelineAsync(long exceptionId, string code, string label, string? from, string? to,
        long? operatorId, string? operatorName, string? remark) =>
        await _timelineRep.InsertAsync(new AdoS8ExceptionTimeline
        {
            ExceptionId = exceptionId,
            ActionCode = code,
            ActionLabel = label,
            FromStatus = from,
            ToStatus = to,
            OperatorId = operatorId,
            OperatorName = operatorName,
            ActionRemark = remark,
            CreatedAt = DateTime.Now
        });
}