package main

import (
	"encoding/csv"
	"fmt"
	"os"
	"strconv"
)

func main() {
	args := os.Args
	if len(args) < 2 {
		fmt.Println("Use godo ? or help for the help menu")
		os.Exit(0)
	}

	switch args[1] {
	case "?", "help":
		help()
	case "a", "add":
		add(args[2])
	case "l", "list":
		list()
	case "d", "delete":
		delete(args[2])
	}

}

// List all available commands
func help() {
	fmt.Println("?/help - help menu")
	fmt.Println("a/add - add new task. Must be in quotations")
	fmt.Println("d/delete - delete task")
	fmt.Println("l/list - list all tasks")
}

// Add new task
func add(task string) {
	file, err := os.OpenFile("tasks.csv", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
	if err != nil {
		fmt.Println("Error Creating File;", err)
		os.Exit(1)
	}
	defer file.Close()

	writer := csv.NewWriter(file)
	defer writer.Flush()
	var taskWrite []string
	taskWrite = append(taskWrite, task)
	writer.Write(taskWrite)
}

// List all current tasks
func list() {
	file, err := os.Open("tasks.csv")
	if err != nil {
		fmt.Printf("Error: %v", err)
	}

	defer file.Close()
	if err != nil {
		fmt.Printf("Error: %v", err)
	}

	reader := csv.NewReader(file)
	records, err := reader.ReadAll()

	if err != nil {
		fmt.Printf("Error: %v", err)
	}
	x := 1
	for _, record := range records {

		fmt.Printf("%x - %s\n", x, record[0])
		x += 1
	}
}

// Delete the requested task
func delete(task string) {

	fileName := "tasks.csv"

	// Convert arg to int
	taskInt, err := strconv.Atoi(task)
	if err != nil {
		fmt.Println("error")
	}

	//open the task csv
	file, err := os.Open(fileName)
	if err != nil {
		fmt.Printf("Error: %v", err)
	}

	defer file.Close()
	if err != nil {
		fmt.Printf("Error: %v", err)
	}
	//read the file
	reader := csv.NewReader(file)
	records, err := reader.ReadAll()

	if err != nil {
		fmt.Printf("Error: %v", err)
	}
	//close file and delete
	file.Close()
	os.Remove(fileName)
	//check if the arg number is equal to the csv line number. If not pass it to the add function to readd it
	x := 1
	for _, record := range records {
		if x != taskInt {
			add(record[0])
		}
		x += 1
	}

}