package flow_instance

import (
	"approveflow/app/provider/flow_definition"
	"approveflow/app/provider/flow_instance/model"
	"context"
	"github.com/Superdanda/hade/framework"
	"github.com/Superdanda/hade/framework/contract"
	"github.com/Superdanda/hade/framework/gin"
	"github.com/pkg/errors"
)

type FlowInstanceService struct {
	container framework.Container
}

func (f *FlowInstanceService) CreateInstance(ctx *gin.Context, approvalFlow *flow_definition.ApprovalFlow, data map[string]interface{}) (*model.ApprovalInstance, error) {
	instance, err := model.NewApprovalInstance(ctx, approvalFlow, data)
	if err != nil {
		return nil, err
	}
	err = f.GetFlowInstanceRepository().SaveInstance(ctx, instance)
	if err != nil {
		return nil, err
	}
	return instance, nil
}

func (f *FlowInstanceService) StartInstance(ctx context.Context, instanceID int64) (*model.ApprovalInstance, error) {
	return f.handlerInstance(ctx, instanceID, func(ctx context.Context, instance *model.ApprovalInstance) error {
		err := instance.Start(ctx)
		return err
	})
}

func (f *FlowInstanceService) GetInstance(ctx context.Context, instanceID int64) (*model.ApprovalInstance, error) {
	return f.GetFlowInstanceRepository().GetInstanceByID(ctx, instanceID)
}

func (f *FlowInstanceService) GetInstancePage(ctx context.Context, pageNum, pageSize int, instance *model.ApprovalInstance) ([]*model.ApprovalInstance, int64, error) {
	return f.GetFlowInstanceRepository().GetInstancePage(ctx, pageNum, pageSize, instance)
}

func (f *FlowInstanceService) CancelInstance(ctx context.Context, instanceID int64) error {
	//TODO implement me
	panic("implement me")
}

func (f *FlowInstanceService) ApproveStep(ctx context.Context, instanceID int64, stepID int64, comments string) error {
	return f.handlerStep(ctx, instanceID, stepID, func(ctx context.Context, instance *model.ApprovalInstance, step *model.InstanceStep) error {
		err := step.Approve(comments)
		if err != nil {
			return err
		}
		return nil
	})
}

func (f *FlowInstanceService) RejectStep(ctx context.Context, instanceID int64, stepID int64, comments string) error {
	return f.handlerStep(ctx, instanceID, stepID, func(ctx context.Context, instance *model.ApprovalInstance, step *model.InstanceStep) error {
		err := step.Reject(comments)
		if err != nil {
			return err
		}
		return nil
	})
}

func (f *FlowInstanceService) GetCurrentStep(ctx context.Context, instanceID int64) ([]*model.InstanceStep, error) {
	instance, err := f.GetInstance(ctx, instanceID)
	if err != nil {
		return nil, err
	}
	return instance.GetCurrentSteps(), nil
}

func (f *FlowInstanceService) AddCustomStep(ctx context.Context, instanceID int64, step *model.InstanceStep, fromStepKey, toStepKey string) (*model.ApprovalInstance, error) {
	return f.handlerInstance(ctx, instanceID, func(ctx context.Context, instance *model.ApprovalInstance) error {
		fromStep, err := instance.GetStepByKey(fromStepKey)
		if err != nil {
			return err
		}
		// 如果是 自定义阶段 那么它的路径配置能够实例对象中找到
		if fromStep.IsDynamic {
			//instance.InstancePathConfigs
		}

		return nil
	})
}

func (f *FlowInstanceService) GetCustomSteps(ctx context.Context, instanceID int64) ([]*model.InstanceStep, error) {
	//TODO implement me
	panic("implement me")
}

func (f *FlowInstanceService) RemoveCustomStep(ctx context.Context, instanceID int64, stepID int64) error {
	//TODO implement me
	panic("implement me")
}

func (f *FlowInstanceService) PerformReversal(ctx context.Context, instanceID int64, stepID int64, reason string) error {
	//TODO implement me
	panic("implement me")
}

func (f *FlowInstanceService) GetReversalInfo(instanceID int64) (model.ApprovalReversal, error) {
	//TODO implement me
	panic("implement me")
}

func (f *FlowInstanceService) CreateBatchApprovalTask(ctx context.Context, approverKey string, stepIDs []int64) (*model.BatchApprovalTask, error) {
	//TODO implement me
	panic("implement me")
}

func (f *FlowInstanceService) ExecuteBatchApprovalTask(ctx context.Context, taskID int64, approverKey string, comments string) error {
	//TODO implement me
	panic("implement me")
}

func (f *FlowInstanceService) GetBatchApprovalTasks(ctx context.Context, approverKey string) ([]model.BatchApprovalTask, error) {
	//TODO implement me
	panic("implement me")
}

func (f *FlowInstanceService) GetApprovalRecords(ctx context.Context, instanceID int64) ([]*model.ApprovalRecord, error) {
	//TODO implement me
	panic("implement me")
}

func NewFlowInstanceService(params ...interface{}) (interface{}, error) {
	container := params[0].(framework.Container)
	return &FlowInstanceService{container: container}, nil
}

func (f *FlowInstanceService) GetFlowInstanceRepository() FlowInstanceRepository {
	infrastructureService := f.container.MustMake(contract.InfrastructureKey).(contract.InfrastructureService)
	return infrastructureService.GetModuleOrmRepository(InstanceRepositoryKey).(FlowInstanceRepository)
}

func (f *FlowInstanceService) handlerInstance(ctx context.Context, instanceID int64,
	handler func(ctx context.Context, instance *model.ApprovalInstance) error,
) (*model.ApprovalInstance, error) {
	instance, err := f.GetInstance(ctx, instanceID)
	if err != nil {
		return nil, err
	}
	err = handler(ctx, instance)
	if err != nil {
		return nil, err
	}
	return instance, nil
}

func (f *FlowInstanceService) handlerStep(ctx context.Context, instanceID int64, stepID int64,
	handler func(ctx context.Context, instance *model.ApprovalInstance, step *model.InstanceStep) error,
) error {
	instance, instanceStep, err := f.GetInstanceAndCurrentStep(ctx, instanceID, stepID)

	if err != nil {
		return err
	}

	err = handler(ctx, instance, instanceStep)
	if err != nil {
		return err
	}

	err = f.GetFlowInstanceRepository().SaveInstance(ctx, instance)
	if err != nil {
		return err
	}

	return nil
}

func (f *FlowInstanceService) GetInstanceAndCurrentStep(ctx context.Context, instanceID int64, stepID int64) (*model.ApprovalInstance, *model.InstanceStep, error) {
	instance, err := f.GetInstance(ctx, instanceID)
	if err != nil {
		return nil, nil, err
	}
	step := instance.GetCurrentStepsById(stepID)
	if step == nil {
		return instance, nil, errors.New("step not found")
	}
	return instance, step, nil
}