using Admin.NET.Plugin.AiDOP.Entity.S8;
using Admin.NET.Plugin.AiDOP.Infrastructure.S8;
using Admin.NET.Plugin.ApprovalFlow.Service;

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

public class S8TaskFlowService : ITransient
{
    private readonly SqlSugarRepository<AdoS8Exception> _rep;
    private readonly SqlSugarRepository<AdoS8ExceptionTimeline> _timelineRep;
    private readonly FlowEngineService _flowEngine;
    private readonly UserManager _userManager;

    public S8TaskFlowService(
        SqlSugarRepository<AdoS8Exception> rep,
        SqlSugarRepository<AdoS8ExceptionTimeline> timelineRep,
        FlowEngineService flowEngine,
        UserManager userManager)
    {
        _rep = rep;
        _timelineRep = timelineRep;
        _flowEngine = flowEngine;
        _userManager = userManager;
    }

    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);

        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);

        return e;
    }

    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);

        return e;
    }

    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);

        return e;
    }

    public async Task<AdoS8Exception> CloseAsync(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, "CLOSED"))
            throw new S8BizException($"状态 {e.Status} 不可关闭");

        await _flowEngine.StartFlow(new StartFlowInput
        {
            BizType = "EXCEPTION_CLOSURE",
            BizId = e.Id,
            Title = $"异常关闭确认 - {e.ExceptionCode}",
            Comment = remark,
            BizData = new Dictionary<string, object>
            {
                ["sceneCode"] = e.SceneCode,
            }
        });

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

    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");
        if (e.AssigneeId != currentUserId)
            throw new S8BizException("只有当前处理人才能提交复检");
        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);

        return e;
    }

    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");
        if (e.VerifierId != currentUserId)
            throw new S8BizException("只有指定检验人才能检验通过");
        if (!S8StatusRules.IsAllowedTransition(e.Status, "RESOLVED"))
            throw new S8BizException($"状态 {e.Status} 不可检验通过");

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

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

        return e;
    }

    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");
        if (e.VerifierId != currentUserId)
            throw new S8BizException("只有指定检验人才能检验退回");
        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);

        return e;
    }

    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;
    }

    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
        });
}