package main

import (
	"errors"
	"os"
	"strconv"
	"time"

	"github.com/aquasecurity/table"
)

type Todo struct {
	Title     string
	Status    bool
	CreatedAt time.Time
	StatusAt  *time.Time
}

type Todos []Todo

func (todos *Todos) add(title string) {
	todo := Todo{
		Title:     title,
		Status:    false,
		StatusAt:  nil,
		CreatedAt: time.Now(),
	}

	*todos = append(*todos, todo)
}

func (todos *Todos) validateIndex(index int) error {
	if index < 0 || index >= len(*todos) {
		err := errors.New("invalid index")
		return err
	}

	return nil
}

func (todos *Todos) delete(index int) error {
	t := *todos

	if err := t.validateIndex(index); err != nil {
		return err
	}
	*todos = append(t[:index], t[index+1:]...)
	return nil
}

func (todos *Todos) toggle(index int) error {
	t := *todos

	if err := t.validateIndex(index); err != nil {
		return err
	}

	isCompeleted := t[index].Status
	if !isCompeleted {
		completionTime := time.Now()
		t[index].StatusAt = &completionTime
	}
	t[index].Status = !isCompeleted
	return nil
}

func (todos *Todos) edit(index int, newTitle string) error {
	t := *todos

	if err := t.validateIndex(index); err != nil {
		return err
	}
	t[index].Title = newTitle
	return nil
}

func (todos *Todos) print() {
	table := table.New(os.Stdout)
	table.SetRowLines(false)
	table.SetHeaders("Index", "Title", "Status", "Created at", "Status at")
	for index, t := range *todos {
		completed := "❌"
		completedAt := ""

		if t.Status {
			completed = "✅"
			if t.StatusAt != nil {
				completedAt = t.StatusAt.Format(time.RFC1123)
			}
		}
		table.AddRow(strconv.Itoa(index), t.Title, completed, t.CreatedAt.Format(time.RFC1123), completedAt)
	}
	table.Render()
}