package tasks

import (
	"database/sql"

	_ "github.com/go-sql-driver/mysql" // Mysql Driver
)

// Dbhost : Database host (can be tweaked in makefile)
var Dbhost string

// Dbname : Database name (can be tweaked in makefile)
var Dbname string

// Dbuser : Database user (can be tweaked in makefile)
var Dbuser string

// Dbpass : Database password (can be tweaked in)
var Dbpass string

// Task : Struct for Task type
type Task struct {
	ID      int            `json:"id"`
	Task    string         `json:"task"`
	Args    string         `json:"args"`
	Status  string         `json:"status"`
	Result  sql.NullString `json:"result"` // Database fields that can be null must use the sql.NullString type
	Created string         `json:"created"`
	Updated string         `json:"updated"`
}

// GetNextTask : Performs a MySQL query over the device's Edgebox API
func GetNextTask() Task {

	// Will try to connect to API database, which should be running locally under WS.
	db, err := sql.Open("mysql", Dbuser+":"+Dbpass+"@tcp("+Dbhost+")/"+Dbname)

	// if there is an error opening the connection, handle it
	if err != nil {
		panic(err.Error())
	}

	// defer the close till after the main function has finished executing
	defer db.Close()

	// perform a db.Query insert
	results, err := db.Query("SELECT * FROM tasks WHERE status = 0 ORDER BY created ASC LIMIT 1;")

	// if there is an error inserting, handle it
	if err != nil {
		panic(err.Error())
	}

	var task Task

	for results.Next() {

		// for each row, scan the result into our task composite object
		err = results.Scan(&task.ID, &task.Task, &task.Args, &task.Status, &task.Result, &task.Created, &task.Updated)
		if err != nil {
			panic(err.Error()) // proper error handling instead of panic in your app
		}
	}

	// be careful deferring Queries if you are using transactions
	defer results.Close()

	return task

}

func updateTaskStatus(taskID *string, newStatus *int) {

}

func executeTask(task *Task) {

}

func publishTaskResult(taskID *string, result *string) {

}