package main

import(
	"fmt"
	tea "github.com/charmbracelet/bubbletea"
)

func (m model) Init() tea.Cmd {
    // Just return `nil`, which means "no I/O right now, please."
    return nil
}

func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
    switch msg := msg.(type) {

    // Is it a key press?
    case tea.KeyMsg:

        // Cool, what was the actual key pressed?
        switch msg.String() {

        // These keys should exit the program.
        case "ctrl+c", "q":
            return m, tea.Quit

        // The "up" and "k" keys move the cursor up
        case "up", "k":
            if m.cursor > 0 {
                m.cursor--
            }

        // The "down" and "j" keys move the cursor down
        case "down", "j":
            if m.cursor < len(m.todos)-1 {
                m.cursor++
            }
		
		case "left", "h":
			if m.tab > 0 {
				m.tab--
			}

		case "right", "l":
			if m.tab < 4 {
				m.tab++
			}

        // The "enter" key and the spacebar (a literal space) toggle
        // the selected state for the item that the cursor is pointing at.
        case "enter", " ":
            _, ok := m.selected[m.cursor]
            if ok {
                delete(m.selected, m.cursor)
            } else {
                m.selected[m.cursor] = struct{}{}
            }
        }
    }

    // Return the updated model to the Bubble Tea runtime for processing.
    // Note that we're not returning a command.
    return m, nil
}

func (m model) View() string {
    // The header
    s := ""
	currentList := []todo{}

	switch m.tab {
	case 0:
		s += "Inbox"
		inboxFilter := func(t todo) bool { return t.isInbox}
		currentList = filter(m.todos, inboxFilter)
	case 1:
		s += "Today"
	case 2:
		s += "Tomorrow"
	case 3:
		s += "Scheduled"
	case 4:
		s += "Anytime"
	}

	s += "\n\n"


    // Iterate over our choices
    for i, choice := range currentList {

        // Is the cursor pointing at this choice?
        cursor := " " // no cursor
        if m.cursor == i {
            cursor = ">" // cursor!
        }

        // Is this choice selected?
        checked := " " // not selected
        if _, ok := m.selected[i]; ok {
            checked = "x" // selected!
        }

        // Render the row
        s += fmt.Sprintf("%s [%s] %s\n", cursor, checked, choice)
    }

    // The footer
	s += "n: new\n"
    s += "q: quit.\n"

    // Send the UI for rendering
    return s
}