package saga

import (
	"encoding/json"
	"git.sxidc.com/service-supports/dapr_api/state"
	"git.sxidc.com/service-supports/dapr_api/utils"
)

const (
	sagaIndexes = "indexes"
)

type OrchestratorState struct {
	Name                string
	RollbackContextData string
	RollbackStartIndex  int
}

func deleteOrchestratorState(stateAPI *state.API, stateStoreName string, sagaName string, orchestratorName string) error {
	orchestratorNames, err := getSagaIndexState(stateAPI, stateStoreName, sagaName)
	if err != nil {
		return err
	}

	for i, savedOrchestratorName := range orchestratorNames {
		if savedOrchestratorName == orchestratorName {
			if i == len(orchestratorNames)-1 {
				orchestratorNames = orchestratorNames[:i]
			} else {
				orchestratorNames = append(orchestratorNames[0:i], orchestratorNames[i+1:]...)
			}
		}
	}

	if len(orchestratorNames) == 0 {
		return stateAPI.Transaction(stateStoreName, state.TransactionRequest{
			Operations: []state.TransactionOperation{
				{
					Operation: state.TransactionDelete,
					Request: state.TransactionOperationRequest{
						Key: sagaName,
					},
				},
				{
					Operation: state.TransactionDelete,
					Request: state.TransactionOperationRequest{
						Key: orchestratorName,
					},
				},
			},
		})
	}

	orchestratorNames = append(orchestratorNames, orchestratorName)
	sagaIndexStateJsonData, err := json.Marshal(&map[string]interface{}{sagaIndexes: orchestratorNames})
	if err != nil {
		return err
	}

	return stateAPI.Transaction(stateStoreName, state.TransactionRequest{
		Operations: []state.TransactionOperation{
			{
				Operation: state.TransactionUpsert,
				Request: state.TransactionOperationRequest{
					Key:   sagaName,
					Value: string(sagaIndexStateJsonData),
				},
			},
			{
				Operation: state.TransactionDelete,
				Request: state.TransactionOperationRequest{
					Key: orchestratorName,
				},
			},
		},
	})
}

func getSagaIndexState(stateAPI *state.API, stateStoreName string, sagaName string) ([]string, error) {
	data, _, err := stateAPI.GetState(stateStoreName, sagaName, nil)
	if err != nil {
		return nil, err
	}

	if utils.HasBlank(data) {
		return make([]string, 0), nil
	}

	orchestratorNames := make([]string, 0)
	err = json.Unmarshal([]byte(data), &map[string]interface{}{sagaIndexes: orchestratorNames})
	if err != nil {
		return nil, err
	}

	return orchestratorNames, nil
}

func saveOrchestratorState(stateAPI *state.API, stateStoreName string, sagaName string, orchestratorName string,
	rollbackContextData string, rollbackStartIndex int) error {
	orchestratorStateJsonData, err := json.Marshal(&OrchestratorState{
		Name:                orchestratorName,
		RollbackContextData: rollbackContextData,
		RollbackStartIndex:  rollbackStartIndex,
	})
	if err != nil {
		return err
	}

	orchestratorNames, err := getSagaIndexState(stateAPI, stateStoreName, sagaName)
	if err != nil {
		return err
	}

	find := false
	for _, savedOrchestratorName := range orchestratorNames {
		if savedOrchestratorName == orchestratorName {
			find = true
		}
	}

	if find {
		err := stateAPI.SaveState(stateStoreName, []state.SaveStateRequest{
			{
				Key:   orchestratorName,
				Value: string(orchestratorStateJsonData),
			},
		})
		if err != nil {
			return err
		}

		return nil
	}

	orchestratorNames = append(orchestratorNames, orchestratorName)
	sagaIndexStateJsonData, err := json.Marshal(&map[string]interface{}{sagaIndexes: orchestratorNames})
	if err != nil {
		return err
	}

	return stateAPI.Transaction(stateStoreName, state.TransactionRequest{
		Operations: []state.TransactionOperation{
			{
				Operation: state.TransactionUpsert,
				Request: state.TransactionOperationRequest{
					Key:   sagaName,
					Value: string(sagaIndexStateJsonData),
				},
			},
			{
				Operation: state.TransactionUpsert,
				Request: state.TransactionOperationRequest{
					Key:   orchestratorName,
					Value: string(orchestratorStateJsonData),
				},
			},
		},
	})
}

func getSagaOrchestratorStates(stateAPI *state.API, stateStoreName string, sagaName string) ([]OrchestratorState, error) {
	data, _, err := stateAPI.GetState(stateStoreName, sagaName, nil)
	if err != nil {
		return nil, err
	}

	if utils.HasBlank(data) {
		return make([]OrchestratorState, 0), nil
	}

	indexes := make(map[string][]string)
	err = json.Unmarshal([]byte(data), &indexes)
	if err != nil {
		return nil, err
	}

	orchestratorStates := make([]OrchestratorState, 0)
	for _, orchestratorName := range indexes[sagaIndexes] {
		data, _, err := stateAPI.GetState(stateStoreName, orchestratorName, nil)
		if err != nil {
			return nil, err
		}

		orchestratorState := new(OrchestratorState)
		err = json.Unmarshal([]byte(data), orchestratorState)
		if err != nil {
			return nil, err
		}

		orchestratorStates = append(orchestratorStates, *orchestratorState)
	}

	return orchestratorStates, nil
}