// localizing all of the functions required to construct the user interface

package itashi

import (
	"fmt"
	"time"

	tea "github.com/charmbracelet/bubbletea"
)

const SPRING_EQUINOX = 81
const SUMMER_SOLSTICE = 173
const AUTUMN_EQUINOX = 265
const WINTER_SOLSTICE = 356

func getSeason(dayofyear int) string {
	if dayofyear > 365 {
		return "[REDACTED]"
	}
	if dayofyear < 0 {
		return "[REDACTED]"
	}
	if dayofyear > 0 && dayofyear < SPRING_EQUINOX {
		return "Winter"
	}
	if dayofyear > SPRING_EQUINOX && dayofyear < SUMMER_SOLSTICE {
		return "Spring"
	}
	if dayofyear > SUMMER_SOLSTICE && dayofyear < AUTUMN_EQUINOX {
		return "Summer"
	}
	if dayofyear > AUTUMN_EQUINOX && dayofyear < WINTER_SOLSTICE {
		return "Autumn"
	}
	if dayofyear > WINTER_SOLSTICE && dayofyear < 365 {
		return "Winter"
	}
	return "Dont know how you got here...."

}

type model struct {
	choices  []string
	cursor   int
	selected map[int]struct{}
}

func InitialModel() model {
	shelf := NewFilesystemShelf(FS_SAVE_LOCATION)
	shelf.AddTask(Task{Id: 1, Title: "This is a sample task", Desc: "Quick sample task that im testing the storage with",
		Due: time.Now().AddDate(0, 0, 2), Done: false, Priority: 1})
	return model{
		// Our to-do list is a grocery list
		choices: GetTaskNames(shelf.GetAll()),

		// A map which indicates which choices are selected. We're using
		// the  map like a mathematical set. The keys refer to the indexes
		// of the `choices` slice, above.
		selected: make(map[int]struct{}),
	}
}

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.choices)-1 {
				m.cursor++
			}

		// 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
	rn := time.Now()
	rnString := fmt.Sprintf("%s %v, %v", rn.Month().String(), rn.Day(), rn.Year())
	season := getSeason(rn.YearDay())
	solsticeDiff := 10
	day := rn.Weekday()
	timenow := fmt.Sprintf("%v:%v %s", rn.Hour(), rn.Minute(), "AM")
	toEod := 5
	toSd := 6

	s := fmt.Sprintf(
		`
%s                                 %s, %v days until the next solstice.  
%s    
%s (%vH, %vM -> EoD, %vH, %vM -> sunset)

`, rnString, season, solsticeDiff, day, timenow, toEod, toEod, toSd, toSd)

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

		// 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 += "\nPress q to quit.\n"

	// Send the UI for rendering
	return s
}