package gui

import (
	"fmt"
	"math/rand"
	"strings"
	"time"

	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
)

var hotPinkTextStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("#FF06B7"))
var frontTextStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("#268bd2"))
var backTextStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("#6c71c4"))

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

	case tea.KeyMsg:
		// string value of keypresses
		switch msg.String() {

		case "1": // View
			m.drawSeen = true
		case "2": // Correct
			if m.drawSeen {
				m.drawSeen = false
				m.drawRandomCard()
			}
		case "3": // Incorrect
			if m.drawSeen {
				m.drawSeen = false
				m.drawRandomCard()
			}
		case "4": // Skip
			if !m.drawSeen {
				m.drawSeen = false
				m.drawRandomCard()
			}

		case "ctrl+c", "q":
			return m, tea.Quit
		case "s":
			m.switchMode(Select)
		}
	}
	return m, tea.Tick(time.Second, func(_ time.Time) tea.Msg {
		return nil
	})
}

func (m *model) viewDraw() string {
	card := m.selectedCard()

	// Button Text
	viewText := "1: View"
	correctText := "2: Correct"
	incorrectText := "3: Incorrect"
	skipText := "4: Skip"

	// Buttons default
	viewOption := fmt.Sprintf("[%s]", hotPinkTextStyle.Width(7).Render(viewText))
	correctOption := fmt.Sprintf(strings.Repeat(" ", len(correctText)+2))
	incorrectOption := fmt.Sprintf(strings.Repeat(" ", len(incorrectText)+2))
	skipOption := fmt.Sprintf(strings.Repeat(" ", len(skipText)+2))

	// Button text filling
	frontText := frontTextStyle.Width(len(card.Front)).Render(card.Front)
	backText := ""

	if m.drawSeen {
		backText = backTextStyle.Width(len(card.Back)).Render(card.Back)
		correctOption = fmt.Sprintf("[%s]", hotPinkTextStyle.Width(10).Render(correctText))
		incorrectOption = fmt.Sprintf("[%s]", hotPinkTextStyle.Width(12).Render(incorrectText))
	} else {
		skipOption = fmt.Sprintf("[%s]", hotPinkTextStyle.Width(7).Render(skipText))
	}

	selectedMap := fmt.Sprintf("%v", m.selected)

	// Return a template
	return template(`Draw Mode ({numSelected} cards, {selectedCardIndexes}):

{frontTextStyle}
{backTextStyle}

{viewOption}    {correctOption}    {incorrectOption}    {skipOption}

Press [s] to go back to select
Press [q] to quit.
`,
		"{numSelected}", fmt.Sprintf("%d", len(m.selected)),
		"{selectedCardIndexes}", fmt.Sprintf("%v", m.selectedCardIndexes()),
		"{cardList}", m.cardListToString(),
		"{selectedMap}", fmt.Sprintf("%s", frontTextStyle.Width(len(selectedMap)).Render(selectedMap)),
		"{viewOption}", viewOption,
		"{correctOption}", correctOption,
		"{incorrectOption}", incorrectOption,
		"{skipOption}", skipOption,
		"{frontTextStyle}", frontText,
		"{backTextStyle}", backText,
	)

}

func (m *model) cardListToString() string {
	s := ""
	for i, card := range m.deck {
		if _, ok := m.selected[i]; ok {
			s += fmt.Sprintf("%d %s [%s]\n", i, card.Front, card.Back)
		}
	}
	return s
}

func (m *model) drawRandomCard() {
	if len(m.selectedCardIndexes()) == 1 {
		// Can't draw a next card, just return same card.
		return
	}
	rand.Seed(time.Now().Unix()) // initialize global pseudo random generator
	indexes := m.selectedCardIndexes()
	nextId := m.drawCardId

	// Randomize until the next card is not the same card
	for {
		randomIndex := indexes[rand.Intn(len(indexes))]
		nextId = m.deck[randomIndex].Id
		if m.drawCardId != nextId {
			break
		}
	}

	m.drawCardId = nextId
}