package apidVerifyApiKey

import (
	"database/sql"
	"github.com/30x/apid"
	"github.com/apigee-labs/transicator/common"
)

type handler struct {
}

func (h *handler) String() string {
	return "verifyAPIKey"
}

func (h *handler) Handle(e apid.Event) {

	snapData, ok := e.(*common.Snapshot)
	if ok {
		processSnapshot(snapData)
	} else {
		changeSet, ok := e.(*common.ChangeList)
		if ok {
			processChange(changeSet)
		} else {
			log.Errorf("Received Invalid event. This shouldn't happen!")
		}
	}
	return
}

func processSnapshot(snapshot *common.Snapshot) {

	res := true
	log.Debugf("Process Snapshot data")

	db, err := data.DB()
	if err != nil {
		panic("Unable to access Sqlite DB")
	}

	/*
	 * Iterate the tables, and insert the rows,
	 * Commit them in bulk.
	 */
	for _, payload := range snapshot.Tables {
		switch payload.Name {
		case "kms.developer":
			res = insertDevelopers(payload.Rows, db)
		case "kms.app":
			res = insertApplications(payload.Rows, db)
		case "kms.app_credential":
			res = insertCredentials(payload.Rows, db)
		case "kms.api_product":
			res = insertAPIproducts(payload.Rows, db)
		case "kms.app_credential_apiproduct_mapper":
			res = insertAPIProductMappers(payload.Rows, db)
		}
		if res == false {
			log.Error("Error encountered in Downloading Snapshot for VerifyApiKey")
			return
		}
	}
	log.Debug("Downloading Snapshot for VerifyApiKey complete")
}

/*
 * Performs bulk insert of credentials
 */
func insertCredentials(rows []common.Row, db *sql.DB) bool {

	var scope, id, appId, consumerSecret, appstatus, status, tenantId string
	var issuedAt int64

	prep, err := db.Prepare("INSERT INTO APP_CREDENTIAL (_apid_scope, id, app_id, consumer_secret, app_status, status, issued_at, tenant_id)VALUES($1,$2,$3,$4,$5,$6,$7,$8);")
	if err != nil {
		log.Error("INSERT Cred Failed: ", err)
		return false
	}

	txn, err := db.Begin()
	for _, ele := range rows {
		ele.Get("_apid_scope", &scope)
		ele.Get("id", &id)
		ele.Get("app_id", &appId)
		ele.Get("consumer_secret", &consumerSecret)
		ele.Get("app_status", &appstatus)
		ele.Get("status", &status)
		ele.Get("issued_at", &issuedAt)
		ele.Get("tenant_id", &tenantId)
		_, err = txn.Stmt(prep).Exec(
			scope,
			id,
			appId,
			consumerSecret,
			appstatus,
			status,
			issuedAt,
			tenantId)

		if err != nil {
			log.Error("INSERT CRED Failed: ", id, ", ", scope, ")", err)
			txn.Rollback()
			return false
		} else {
			log.Debug("INSERT CRED Success: (", id, ", ", scope, ")")
		}
	}
	txn.Commit()
	return true
}

/*
 * Performs Bulk insert of Applications
 */
func insertApplications(rows []common.Row, db *sql.DB) bool {

	var scope, EntityIdentifier, DeveloperId, CallbackUrl, Status, AppName, AppFamily, tenantId, CreatedBy, LastModifiedBy string
	var CreatedAt, LastModifiedAt int64

	prep, err := db.Prepare("INSERT INTO APP (_apid_scope, id, developer_id,callback_url,status, name, app_family, created_at, created_by,updated_at, updated_by,tenant_id) VALUES($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12);")
	if err != nil {
		log.Error("INSERT APP Failed: ", err)
		return false
	}

	txn, err := db.Begin()
	for _, ele := range rows {

		ele.Get("_apid_scope", &scope)
		ele.Get("id", &EntityIdentifier)
		ele.Get("developer_id", &DeveloperId)
		ele.Get("callback_url", &CallbackUrl)
		ele.Get("status", &Status)
		ele.Get("name", &AppName)
		ele.Get("app_family", &AppFamily)
		ele.Get("created_at", &CreatedAt)
		ele.Get("created_by", &CreatedBy)
		ele.Get("updated_at", &LastModifiedAt)
		ele.Get("updated_by", &LastModifiedBy)
		ele.Get("tenant_id", &tenantId)

		_, err = txn.Stmt(prep).Exec(
			scope,
			EntityIdentifier,
			DeveloperId,
			CallbackUrl,
			Status,
			AppName,
			AppFamily,
			CreatedAt,
			CreatedBy,
			LastModifiedAt,
			LastModifiedBy,
			tenantId)

		if err != nil {
			log.Error("INSERT APP Failed: (", EntityIdentifier, ", ", tenantId, ")", err)
			txn.Rollback()
			return false
		} else {
			log.Debug("INSERT APP Success: (", EntityIdentifier, ", ", tenantId, ")")
		}
	}
	txn.Commit()
	return true

}

/*
 * Performs bulk insert of Developers
 */
func insertDevelopers(rows []common.Row, db *sql.DB) bool {

	var scope, EntityIdentifier, Email, Status, UserName, FirstName, LastName, tenantId, CreatedBy, LastModifiedBy, Username string
	var CreatedAt, LastModifiedAt int64

	prep, err := db.Prepare("INSERT INTO DEVELOPER (_apid_scope,email,id,tenant_id,status,username,first_name,last_name,created_at,created_by,updated_at,updated_by) VALUES($1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12);")
	if err != nil {
		log.Error("INSERT DEVELOPER Failed: ", err)
		return false
	}

	txn, err := db.Begin()
	for _, ele := range rows {

		ele.Get("_apid_scope", &scope)
		ele.Get("email", &Email)
		ele.Get("id", &EntityIdentifier)
		ele.Get("tenant_id", &tenantId)
		ele.Get("status", &Status)
		ele.Get("username", &Username)
		ele.Get("first_name", &FirstName)
		ele.Get("last_name", &LastName)
		ele.Get("created_at", &CreatedAt)
		ele.Get("created_by", &CreatedBy)
		ele.Get("updated_at", &LastModifiedAt)
		ele.Get("updated_by", &LastModifiedBy)

		_, err = txn.Stmt(prep).Exec(
			scope,
			Email,
			EntityIdentifier,
			tenantId,
			Status,
			UserName,
			FirstName,
			LastName,
			CreatedAt,
			CreatedBy,
			LastModifiedAt,
			LastModifiedBy)

		if err != nil {
			log.Error("INSERT DEVELOPER Failed: (", EntityIdentifier, ", ", scope, ")", err)
			txn.Rollback()
			return false
		} else {
			log.Debug("INSERT DEVELOPER Success: (", EntityIdentifier, ", ", scope, ")")
		}
	}
	txn.Commit()
	return true
}

/*
 * Performs Bulk insert of API products
 */
func insertAPIproducts(rows []common.Row, db *sql.DB) bool {

	var scope, apiProduct, res, env, tenantId string

	prep, err := db.Prepare("INSERT INTO API_PRODUCT (id, api_resources, environments, tenant_id,_apid_scope) VALUES($1,$2,$3,$4,$5)")
	if err != nil {
		log.Error("INSERT API_PRODUCT Failed: ", err)
		return false
	}

	txn, err := db.Begin()
	for _, ele := range rows {

		ele.Get("_apid_scope", &scope)
		ele.Get("id", &apiProduct)
		ele.Get("api_resources", &res)
		ele.Get("environments", &env)
		ele.Get("tenant_id", &tenantId)

		_, err = txn.Stmt(prep).Exec(
			apiProduct,
			res,
			env,
			tenantId,
			scope)

		if err != nil {
			log.Error("INSERT API_PRODUCT Failed: (", apiProduct, ", ", tenantId, ")", err)
			txn.Rollback()
			return false
		} else {
			log.Debug("INSERT API_PRODUCT Success: (", apiProduct, ", ", tenantId, ")")
		}
	}
	txn.Commit()
	return true
}

/*
 * Performs a bulk insert of all APP_CREDENTIAL_APIPRODUCT_MAPPER rows
 */
func insertAPIProductMappers(rows []common.Row, db *sql.DB) bool {

	var ApiProduct, AppId, EntityIdentifier, tenantId, Scope, Status string

	prep, err := db.Prepare("INSERT INTO APP_CREDENTIAL_APIPRODUCT_MAPPER(apiprdt_id, app_id, appcred_id, tenant_id, _apid_scope, status) VALUES($1,$2,$3,$4,$5,$6);")
	if err != nil {
		log.Error("INSERT APP_CREDENTIAL_APIPRODUCT_MAPPER Failed: ", err)
		return false
	}

	txn, err := db.Begin()
	for _, ele := range rows {

		ele.Get("apiprdt_id", &ApiProduct)
		ele.Get("app_id", &AppId)
		ele.Get("appcred_id", &EntityIdentifier)
		ele.Get("tenant_id", &tenantId)
		ele.Get("_apid_scope", &Scope)
		ele.Get("status", &Status)

		/*
		 * If the credentials has been successfully inserted, insert the
		 * mapping entries associated with the credential
		 */

		_, err = txn.Stmt(prep).Exec(
			ApiProduct,
			AppId,
			EntityIdentifier,
			tenantId,
			Scope,
			Status)

		if err != nil {
			log.Error("INSERT APP_CREDENTIAL_APIPRODUCT_MAPPER Failed: (",
				ApiProduct, ", ",
				AppId, ", ",
				EntityIdentifier, ", ",
				tenantId, ", ",
				Scope, ", ",
				Status,
				")",
				err)

			txn.Rollback()
			return false
		} else {
			log.Debug("INSERT APP_CREDENTIAL_APIPRODUCT_MAPPER Success: (",
				ApiProduct, ", ",
				AppId, ", ",
				EntityIdentifier, ", ",
				tenantId, ", ",
				Scope, ", ",
				Status,
				")")
		}
	}
	txn.Commit()
	return true
}

func processChange(changes *common.ChangeList) {

	log.Debugf("apigeeSyncEvent: %d changes", len(changes.Changes))
	var rows []common.Row

	db, err := data.DB()
	if err != nil {
		panic("Unable to access Sqlite DB")
	}

	for _, payload := range changes.Changes {
		rows = nil
		switch payload.Table {
		case "kms.developer":
			switch payload.Operation {
			case 1:
				rows = append(rows, payload.NewRow)
				insertDevelopers(rows, db)
			case 2:
				updateDeveloper(payload.NewRow, payload.OldRow, db)
			case 3:
				deleteDeveloper(payload.OldRow, db)
			}
		case "kms.app":
			switch payload.Operation {
			case 1:
				rows = append(rows, payload.NewRow)
				insertApplications(rows, db)
			case 2:
				updateApplication(payload.NewRow, payload.OldRow, db)
			case 3:
				deleteApplication(payload.OldRow, db)
			}

		case "kms.app_credential":
			switch payload.Operation {
			case 1:
				rows = append(rows, payload.NewRow)
				insertCredentials(rows, db)
			case 2:
				updateCredential(payload.NewRow, payload.OldRow, db)
			case 3:
				deleteCredential(payload.OldRow, db)
			}
		case "kms.api_product":
			switch payload.Operation {
			case 1:
				rows = append(rows, payload.NewRow)
				insertAPIproducts(rows, db)
			case 2:
				updateAPIproduct(payload.NewRow, payload.OldRow, db)
			case 3:
				deleteAPIproduct(payload.OldRow, db)
			}

		case "kms.app_credential_apiproduct_mapper":
			switch payload.Operation {
			case 1:
				rows = append(rows, payload.NewRow)
				insertAPIProductMappers(rows, db)
			case 2:
				updateAPIproductMapper(payload.NewRow, payload.OldRow, db)
			case 3:
				deleteAPIproductMapper(payload.OldRow, db)
			}
		}
	}
}

/*
 * DELETE APP
 */
func deleteApplication(ele common.Row, db *sql.DB) bool {
	return true
}

/*
 * DELETE CRED
 */
func deleteCredential(ele common.Row, db *sql.DB) bool {
	return true
}

/*
 * DELETE developer
 */
func deleteDeveloper(ele common.Row, db *sql.DB) bool {
	return true
}

/*
 * DELETE API product
 */
func deleteAPIproduct(ele common.Row, db *sql.DB) bool {
	return true
}

/*
 * DELETE  APIPRDT MAPPER
 */
func deleteAPIproductMapper(ele common.Row, db *sql.DB) bool {
	return true
}

/*
 * UPDATE APP
 */
func updateApplication(ele common.Row, ele2 common.Row, db *sql.DB) bool {
	return true
}

/*
 * UPDATE CRED
 */
func updateCredential(ele common.Row, ele2 common.Row, db *sql.DB) bool {
	return true
}

/*
 * UPDATE developer
 */
func updateDeveloper(ele common.Row, ele2 common.Row, db *sql.DB) bool {
	return true
}

/*
 * UPDATE API product
 */
func updateAPIproduct(ele common.Row, ele2 common.Row, db *sql.DB) bool {
	return true
}

/*
 * UPDATE APIPRDT MAPPER
 */
func updateAPIproductMapper(ele common.Row, ele2 common.Row, db *sql.DB) bool {
	return true
}