// myGenomes provides functions to store a user's raw genome files
// These are exported from sequencing companies like 23andMe and AncestryDNA

package myGenomes

import "seekia/internal/myDatastores/myMapList"
import "seekia/internal/genetics/readRawGenomes"
import "seekia/internal/localFilesystem"
import "seekia/internal/helpers"
import "seekia/internal/cryptography/blake3"

import "path/filepath"
import "time"
import "sync"
import "errors"
import "strings"

//TODO: Delete unused raw genome files

// This will be locked anytime Genomes are being added/deleted
var updatingMyGenomesMutex sync.Mutex

var myGenomesMapListDatastore *myMapList.MyMapList

// This function must be called whenever an app user signs in
func CreateUserGenomesFolder() error{

	userDirectory, err := localFilesystem.GetAppUserFolderPath()
	if (err != nil) { return err }
	
	myGenomesFolderPath := filepath.Join(userDirectory, "MyGenomes")
	
	_, err = localFilesystem.CreateFolder(myGenomesFolderPath)
	if (err != nil) { return err }
	
	return nil
}

// This function must be called whenever an app user signs in
func InitializeMyGenomeDatastore()error{

	updatingMyGenomesMutex.Lock()
	defer updatingMyGenomesMutex.Unlock()

	newMyGenomesMapListDatastore, err := myMapList.CreateNewMapList("MyGenomes")
	if (err != nil) { return err }

	myGenomesMapListDatastore = newMyGenomesMapListDatastore

	return nil
}

//Outputs:
//	-[]map[string]string
//		-PersonIdentifier -> Identifier of Genome Person
//		-GenomeIdentifier -> Genome identifier (this is the name of the .txt file stored on disk)
//		-TimeExported -> Time the genome file was exported from company
//		-TimeImported -> Time the genome was imported into Seekia
//		-IsPhased -> "Yes"/"No"
//		-SNPCount -> Number of readable SNPs in file
//		-CompanyName -> Company name ("23andMe", "AncestryDNA")
//		-ImportVersion -> Import version for the company from which the metadata was retrieved
//		-FileHash -> 256 bits Blake3 hash of the genome file
//	-error
func GetMyRawGenomesMetadataMapList()([]map[string]string, error){

	myRawGenomesMapList, err := myGenomesMapListDatastore.GetMapList()
	if (err != nil) { return nil, err }

	return myRawGenomesMapList, nil
}

//Outputs:
//	-bool: File is valid
//	-bool: File already exists
//	-error
func AddRawGenome(personIdentifier string, rawGenomeString string)(bool, bool, error){

	isValid := helpers.VerifyHexString(15, personIdentifier)
	if (isValid == false) {
		return false, false, errors.New("AddRawGenome called with invalid personIdentifier: " + personIdentifier)
	}

	updatingMyGenomesMutex.Lock()
	defer updatingMyGenomesMutex.Unlock()

	currentFileHash, err := blake3.GetBlake3HashAsHexString(32, []byte(rawGenomeString))
	if (err != nil) { return false, false, err }

	// We check to see if this file has already been imported for this Person
	lookupMap := map[string]string{
		"PersonIdentifier": personIdentifier,
		"FileHash": currentFileHash,
	}

	anyItemFound, _, err := myGenomesMapListDatastore.GetMapListItems(lookupMap)
	if (err != nil) { return false, false, err }
	if (anyItemFound == true){
		// Genome already exists
		return true, true, nil
	}

	// Genome is new. We will add it to the map list and copy the file to Seekia local storage

	rawGenomeReader := strings.NewReader(rawGenomeString)
	
	companyName, importVersion, timeFileWasGenerated, snpCount, genomeIsPhased, _, err := readRawGenomes.ReadRawGenomeFile(rawGenomeReader)
	if (err != nil){
		return false, false, nil
	}

	genomeIdentifier, err := helpers.GetNewRandomHexString(16)
	if (err != nil) { return false, false, err }

	importVersionString := helpers.ConvertIntToString(importVersion)

	timeExported := helpers.ConvertInt64ToString(timeFileWasGenerated)

	timeImported := time.Now().Unix()
	timeImportedString := helpers.ConvertInt64ToString(timeImported)

	isPhasedString := helpers.ConvertBoolToYesOrNoString(genomeIsPhased)

	snpCountString := helpers.ConvertInt64ToString(snpCount)

	newGenomeMap := map[string]string{
		"PersonIdentifier": personIdentifier,
		"GenomeIdentifier": genomeIdentifier,
		"TimeExported": timeExported,
		"TimeImported": timeImportedString,
		"IsPhased": isPhasedString,
		"SNPCount": snpCountString,
		"CompanyName": companyName,
		"ImportVersion": importVersionString,
		"FileHash": currentFileHash,
	}

	err = myGenomesMapListDatastore.AddMapListItem(newGenomeMap)
	if (err != nil) { return false, false, err }

	userDirectory, err := localFilesystem.GetAppUserFolderPath()
	if (err != nil) { return false, false, err }

	myGenomesFolderPath := filepath.Join(userDirectory, "MyGenomes")

	genomeFileName := genomeIdentifier + ".txt"

	err = localFilesystem.CreateOrOverwriteFile([]byte(rawGenomeString), myGenomesFolderPath, genomeFileName)
	if (err != nil) { return false, false, err }

	return true, false, nil
}

func DeleteMyRawGenome(genomeIdentifier string)error{

	isValid := helpers.VerifyHexString(16, genomeIdentifier)
	if (isValid == false){
		return errors.New("DeleteMyRawGenome called with invalid genomeIdentifier: " + genomeIdentifier)
	}

	updatingMyGenomesMutex.Lock()
	defer updatingMyGenomesMutex.Unlock()

	mapToDelete := map[string]string{
		"GenomeIdentifier": genomeIdentifier,
	}

	err := myGenomesMapListDatastore.DeleteMapListItems(mapToDelete)
	if (err != nil) { return err }

	userDirectory, err := localFilesystem.GetAppUserFolderPath()
	if (err != nil) { return err }

	genomeFileName := genomeIdentifier + ".txt"

	genomeFilePath := filepath.Join(userDirectory, "MyGenomes", genomeFileName)

	_, err = localFilesystem.DeleteFileOrFolder(genomeFilePath)
	if (err != nil) { return err }

	return nil
}

//Outputs:
//	-bool: Genome found
//	-string: Person identifier
//	-int64: Time Genome was exported from company
//	-int64: Time genome was imported into Seekia
//	-bool: Is Phased
//	-int64: SNP Count
//	-string: CompanyName
//	-int: Import version
//	-string: FileHash
//	-error
func GetMyRawGenomeMetadata(genomeIdentifier string)(bool, string, int64, int64, bool, int64, string, int, string, error){

	if (genomeIdentifier == "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" || genomeIdentifier == "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"){
		// These are the genome identifiers we use for example reports
		// These are used to show the user what a genetic analysis would look like

		getPersonIdentifier := func()string{

			if (genomeIdentifier == "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"){
				return "111111111111111111111111111111"
			}

			return "222222222222222222222222222222"
		}

		personIdentifier := getPersonIdentifier()

		return true, personIdentifier, 0, 0, false, 676720, "AncestryDNA", 1, "", nil
	}

	lookupMap := map[string]string{
		"GenomeIdentifier": genomeIdentifier,
	}

	anyItemFound, foundItemsMapList, err := myGenomesMapListDatastore.GetMapListItems(lookupMap)
	if (anyItemFound == false){
		return false, "", 0, 0, false, 0, "", 0, "", nil
	}
	if (len(foundItemsMapList) != 1){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Contains multiple entries for same GenomeIdentifier")
	}
	genomeMap := foundItemsMapList[0]
	
	personIdentifier, exists := genomeMap["PersonIdentifier"]
	if (exists == false){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item missing PersonIdentifier")
	}

	timeExported, exists := genomeMap["TimeExported"]
	if (exists == false){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item missing TimeExported")
	}

	timeImported, exists := genomeMap["TimeImported"]
	if (exists == false){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item missing TimeImported")
	}

	isPhased, exists := genomeMap["IsPhased"]
	if (exists == false){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item missing IsPhased")
	}
	snpCount, exists := genomeMap["SNPCount"]
	if (exists == false){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item missing SNPCount")
	}
	companyName, exists := genomeMap["CompanyName"]
	if (exists == false){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item missing CompanyName")
	}
	importVersion, exists := genomeMap["ImportVersion"]
	if (exists == false){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item missing ImportVersion")
	}
	fileHash, exists := genomeMap["FileHash"]
	if (exists == false){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item missing FileHash")
	}

	timeExportedInt64, err := helpers.ConvertStringToInt64(timeExported)
	if (err != nil){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item contains invalid TimeExported: " + timeExported)
	}
	timeImportedInt64, err := helpers.ConvertStringToInt64(timeImported)
	if (err != nil){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item contains invalid TimeImported: " + timeImported)
	}

	isPhasedBool, err := helpers.ConvertYesOrNoStringToBool(isPhased)
	if (err != nil) {
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item contains invalid isPhased: " + isPhased)
	}

	snpCountInt64, err := helpers.ConvertStringToInt64(snpCount)
	if (err != nil){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item contains invalid snpCount: " + snpCount)
	}

	importVersionInt, err := helpers.ConvertStringToInt(importVersion)
	if (err != nil){
		return false, "", 0, 0, false, 0, "", 0, "", errors.New("Malformed myGenomesMapList: Item contains invalid ImportVersion: " + importVersion)
	}

	return true, personIdentifier, timeExportedInt64, timeImportedInt64, isPhasedBool, snpCountInt64, companyName, importVersionInt, fileHash, nil
}

// This function is used to refresh the genome metadata when a new import version is available
func RefreshRawGenomeMetadata(genomeIdentifier string)error{

	updatingMyGenomesMutex.Lock()
	defer updatingMyGenomesMutex.Unlock()

	myGenomesMapList, err := myGenomesMapListDatastore.GetMapList()
	if (err != nil) { return err }

	foundGenome := false

	for _, genomeMap := range myGenomesMapList{

		currentGenomeIdentifier, exists := genomeMap["GenomeIdentifier"]
		if (exists == false){
			return errors.New("myGenomesMapList item is malformed: item missing GenomeIdentifier.")
		}

		if (currentGenomeIdentifier != genomeIdentifier){
			continue
		}
		if (foundGenome == true){
			return errors.New("myGenomesMapList is malformed: Multiple entries for the same GenomeIdentifier exist.")
		}
		foundGenome = true

		rawGenomeString, err := GetGenomeRawDataString(genomeIdentifier)
		if (err != nil){ return err }

		rawGenomeReader := strings.NewReader(rawGenomeString)

		companyName, importVersion, timeFileWasGenerated, snpCount, genomeIsPhased, _, err := readRawGenomes.ReadRawGenomeFile(rawGenomeReader)
		if (err != nil){
			// Could be that file was importable via old import version, but new import version rejects it.
			// That would still be bad undesireable behavior.
			return errors.New("Unable to import raw genome during RefreshRawGenomeMetadata: " + err.Error())
		}

		importVersionString := helpers.ConvertIntToString(importVersion)

		timeExported := helpers.ConvertInt64ToString(timeFileWasGenerated)

		isPhasedString := helpers.ConvertBoolToYesOrNoString(genomeIsPhased)

		snpCountString := helpers.ConvertInt64ToString(snpCount)

		genomeMap["TimeExported"] = timeExported
		genomeMap["IsPhased"] = isPhasedString
		genomeMap["SNPCount"] = snpCountString
		genomeMap["CompanyName"] = companyName
		genomeMap["ImportVersion"] = importVersionString
	}

	if (foundGenome == false){
		return errors.New("Genome not found during RefreshRawGenomeMetadata")
	}

	err = myGenomesMapListDatastore.OverwriteMapList(myGenomesMapList)
	if (err != nil) { return err }

	return nil
}

//Outputs:
//	-string: Genome raw data string
//	-error
func GetGenomeRawDataString(genomeIdentifier string)(string, error){

	userDirectory, err := localFilesystem.GetAppUserFolderPath()
	if (err != nil) { return "", err }

	genomeFileName := genomeIdentifier + ".txt"

	genomeFilePath := filepath.Join(userDirectory, "MyGenomes", genomeFileName)

	fileExists, fileBytes, err := localFilesystem.GetFileContents(genomeFilePath)
	if (err != nil) { return "", err }
	if (fileExists == false){
		return "", errors.New("GetGenomeRawDataString called with genome whose file we cannot find.")
	}
	fileString := string(fileBytes)

	return fileString, nil
}

// Returns all genomes for a person
func GetAllPersonGenomesMapList(personIdentifier string)([]map[string]string, error){

	lookupMap := map[string]string{
		"PersonIdentifier": personIdentifier,
	}

	anyItemsFound, matchingItemsMapList, err := myGenomesMapListDatastore.GetMapListItems(lookupMap)
	if (err != nil) { return nil, err }
	if (anyItemsFound == false){
		emptyMapList := make([]map[string]string, 0)
		return emptyMapList, nil
	}

	return matchingItemsMapList, nil
}

// This will not include any calculated genome identifiers, which only exist within analyses
func GetAllPersonRawGenomeIdentifiersList(personIdentifier string)([]string, error){

	allPersonGenomesMapList, err := GetAllPersonGenomesMapList(personIdentifier)
	if (err != nil) { return nil, err }

	personGenomeIdentifiersList := make([]string, 0, len(allPersonGenomesMapList))

	for _, genomeMap := range allPersonGenomesMapList{

		genomeIdentifier, exists := genomeMap["GenomeIdentifier"]
		if (exists == false){
			return nil, errors.New("Malformed myGenomesMapList: Item missing GenomeIdentifier")
		}

		personGenomeIdentifiersList = append(personGenomeIdentifiersList, genomeIdentifier)
	}

	return personGenomeIdentifiersList, nil
}


func DeleteAllPersonGenomes(personIdentifier string)error{

	updatingMyGenomesMutex.Lock()
	defer updatingMyGenomesMutex.Unlock()

	mapToDelete := map[string]string{
		"PersonIdentifier": personIdentifier,
	}

	err := myGenomesMapListDatastore.DeleteMapListItems(mapToDelete)
	if (err != nil) { return err }

	return nil
}