// The MIT License (MIT)

// Copyright (c) 2017-2020 Uber Technologies Inc.

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package pinot

import (
	"encoding/json"
	"fmt"
	"time"

	p "github.com/uber/cadence/common/persistence"
	"github.com/uber/cadence/common/types"
)

const (
	Memo = "Memo"
	Attr = "Attr"
)

func buildMap(hit []interface{}, columnNames []string) map[string]interface{} {
	systemKeyMap := make(map[string]interface{})

	for i := 0; i < len(columnNames); i++ {
		key := columnNames[i]
		systemKeyMap[key] = hit[i]
	}

	return systemKeyMap
}

// VisibilityRecord is a struct of doc for deserialization
// this is different from InternalVisibilityWorkflowExecutionInfo
// use this to deserialize the systemKeyMap from Pinot response
type VisibilityRecord struct {
	WorkflowID    string
	RunID         string
	WorkflowType  string
	DomainID      string
	StartTime     int64
	ExecutionTime int64
	CloseTime     int64
	CloseStatus   int
	HistoryLength int64
	TaskList      string
	IsCron        bool
	NumClusters   int16
	UpdateTime    int64
	ShardID       int16
}

func ConvertSearchResultToVisibilityRecord(hit []interface{}, columnNames []string) (*p.InternalVisibilityWorkflowExecutionInfo, error) {
	if len(hit) != len(columnNames) {
		return nil, fmt.Errorf("length of hit (%v) is not equal with length of columnNames(%v)", len(hit), len(columnNames))
	}

	systemKeyMap := buildMap(hit, columnNames)

	jsonSystemKeyMap, err := json.Marshal(systemKeyMap)
	if err != nil {
		return nil, fmt.Errorf("unable to marshal systemKeyMap")
	}

	attributeMap := make(map[string]interface{})
	var memo *p.DataBlob
	if systemKeyMap[Attr] != nil {
		attrMapStr, ok := systemKeyMap[Attr].(string)
		if !ok {
			return nil, fmt.Errorf(`assertion error. Can't convert systemKeyMap[Attr] to string. Found %T`, systemKeyMap[Attr])
		}

		err = json.Unmarshal([]byte(attrMapStr), &attributeMap)
		if err != nil {
			return nil, fmt.Errorf("unable to Unmarshal searchAttribute map: %s", err.Error())
		}

		if attributeMap[Memo] != nil {
			memo, err = convertMemo(attributeMap[Memo])
			if err != nil {
				return nil, fmt.Errorf("unable to convert memo: %s", err.Error())
			}
		}
		delete(attributeMap, Memo) // cleanup after we get memo from search attribute
	}

	// if memo is empty, set it to nil
	if memo != nil && len(memo.GetData()) == 0 {
		memo = nil
	}

	var source *VisibilityRecord
	err = json.Unmarshal(jsonSystemKeyMap, &source)
	if err != nil {
		return nil, fmt.Errorf("unable to Unmarshal systemKeyMap: %s", err.Error())
	}

	record := &p.InternalVisibilityWorkflowExecutionInfo{
		DomainID:         source.DomainID,
		WorkflowType:     source.WorkflowType,
		WorkflowID:       source.WorkflowID,
		RunID:            source.RunID,
		TypeName:         source.WorkflowType,
		StartTime:        time.UnixMilli(source.StartTime), // be careful: source.StartTime is in milliseconds
		ExecutionTime:    time.UnixMilli(source.ExecutionTime),
		TaskList:         source.TaskList,
		IsCron:           source.IsCron,
		NumClusters:      source.NumClusters,
		ShardID:          source.ShardID,
		SearchAttributes: attributeMap,
		Memo:             memo,
	}
	if source.UpdateTime > 0 {
		record.UpdateTime = time.UnixMilli(source.UpdateTime)
	}
	if source.CloseTime > 0 {
		record.CloseTime = time.UnixMilli(source.CloseTime)
		record.Status = toWorkflowExecutionCloseStatus(source.CloseStatus)
		record.HistoryLength = source.HistoryLength
	}

	return record, nil
}

func convertMemo(memoRaw interface{}) (*p.DataBlob, error) {
	db := p.DataBlob{}

	memoRawStr, ok := memoRaw.(string)
	if !ok {
		return nil, fmt.Errorf("memoRaw is not a String: %T", memoRaw)
	}

	err := json.Unmarshal([]byte(memoRawStr), &db)
	if err != nil {
		return nil, fmt.Errorf("unable to unmarshal memoRawStr: %s", err.Error())
	}
	return &db, nil
}

func toWorkflowExecutionCloseStatus(status int) *types.WorkflowExecutionCloseStatus {
	if status < 0 {
		return nil
	}
	closeStatus := types.WorkflowExecutionCloseStatus(status)
	return &closeStatus
}
