package internal

import (
	"errors"
	"fmt"
	"oc-k8s/utils"
	"os"
	"strings"
	"bytes"
	"os/exec"
)

func Help_DB() {
	fmt.Println(`
DB commands: oc-k8s <action> db [options]
  create   - Add datas in db
  replace  - Replace datas in db
  delete   - Delete datas in db
  help     - Show this help message

Usage:
  oc-k8s create db --d [db_name] -r [release] -n [namespace] -f [folder] 
    folder     - Datas folder files path (required)
    release    - Release values name (default: dev)
	namespace  - Namespace values name (default: dev)
    db_name    - db name (default: opencloud)
	folder - Helm config folder (required, default: .)
  oc-k8s upgrade db -d [db_name]  -r [release]  -n [namespace] -f [folder]  
    folder  - Datas folder files path (required)
    release    - Release values name (default: dev)
	namespace  - Namespace values name (default: dev)
    db_name    - db name (default: opencloud)
  oc-k8s delete db -d [db_name] -r [release] -n [namespace] -f [folder] 
    release    - Release values name (default: dev)
	namespace  - Namespace values name (default: dev)
    db_name    - db name (default: opencloud)
	folder - Helm config folder (required, default: .)
  oc-k8s help db `)
}

func Delete_DB(release string, namespace string, dbName string, adminUsr string, adminPsw string) error {
	podName, err := getMongoPod(namespace)
	if err != nil {
		return err
	}
	return utils.Exec("kubectl exec " + podName + " -- mongosh --eval \"db.getSiblingDB('" + dbName + "').dropDatabase()\" -u " + adminUsr + " -p " + adminPsw +" --authenticationDatabase admin")
}

func getFileNames(folderPath string) []string {
	fileNames := []string{}
	entries, err := os.ReadDir(folderPath)
	if err != nil {
		return fileNames
	}
	for _, entry := range entries {
		if entry.IsDir() {
			continue
		}
		fileNames = append(fileNames, entry.Name())
	}
	return fileNames
}

func Create_DB(filePath *string, release string, namespace string, dbName string, adminUsr string, adminPsw string) error {
	if filePath == nil {
		return errors.New("missing db datas file path")
	}
	podName, err := getMongoPod(namespace)
	if err != nil {
		return err
	}
	for _, fileName := range getFileNames(*filePath) {
		fmt.Println("ADD file " + fileName + " in collection")
		fmt.Println("kubectl cp -n " + namespace + " " + *filePath + "/" + fileName + " \"" + podName + ":/tmp/" + fileName + "\"")
		if err := utils.Exec("kubectl cp -n " + namespace + " " + *filePath + "/" + fileName + " \"" + podName + ":/tmp/" + fileName + "\""); err != nil {
			return err
		}
		fmt.Println("kubectl exec -n " + namespace + " " + podName + " -- mongoimport --db " + dbName + " --collection " + strings.ReplaceAll(fileName, ".json", "") + " --file /tmp/" + fileName + " --jsonArray  -u " + adminUsr + " -p " + adminPsw +" --authenticationDatabase admin")
		if err := utils.Exec("kubectl exec -n " + namespace + " " + podName + " -- mongoimport --db " + dbName + " --collection " + strings.ReplaceAll(fileName, ".json", "") + " --file /tmp/" + fileName + " --jsonArray  -u " + adminUsr + " -p " + adminPsw +" --authenticationDatabase admin"); err != nil {
			return err
		}
	}
	return nil
}

func getMongoPod(namespace string) (string, error) {
	cmd := exec.Command("bash", "-c", "kubectl get pods -n "+namespace+" --no-headers -o custom-columns=\":metadata.name\" | grep mongodb | head -n 1")
	var out bytes.Buffer
	cmd.Stdout = &out
	if err := cmd.Run(); err != nil {
		return "", err
	}
	podName := strings.TrimSpace(out.String()) // remove newline
	return podName, nil
}

func Upgrade_DB(filePath *string, release string, namespace string, dbName string, adminUsr string, adminPsw string) error {
	Delete_DB(release, namespace, dbName, adminUsr, adminPsw)
	return Create_DB(filePath, release, namespace, dbName, adminUsr, adminPsw)
}