package app

import (
	_ "embed"
	"os"
	"os/exec"
	"strings"

	"git.sr.ht/~rockorager/vaxis"
	"git.sr.ht/~rockorager/vaxis/widgets/textinput"
	"git.tilde.town/nbsp/directory/ui"
)

//go:embed homepage.txt
var homepage []byte

type App struct {
	allUsers  []string
	users     ui.List
	filter    textinput.Model
	searching bool
}

func New() *App {
	users := []string{"(home)"}
	userDirs, _ := os.ReadDir("/home")
	for _, user := range userDirs {
		if user.IsDir() {
			users = append(users, "~"+user.Name())
		}
	}
	return &App{users: ui.NewList(users, 0), allUsers: users}
}

func (app *App) Event(state *ui.State, event vaxis.Event) {
	if key, ok := event.(vaxis.Key); ok && key.EventType == vaxis.EventPress {
		other := false
		switch key.String() {
		case "Ctrl+c", "Ctrl+d":
			close(ui.Quit)
		case "Down", "Ctrl+n":
			app.users.Down()
		case "Up", "Ctrl+p":
			app.users.Up()
		case "End":
			app.users.End()
		case "Home":
			app.users.Home()
		case "Escape":
			app.searching = false
		default:
			other = true
		}
		if other {
			if !app.searching {
				switch key.String() {
				case "q":
					close(ui.Quit)
				case "j":
					app.users.Down()
				case "k":
					app.users.Up()
				case "g":
					app.users.Home()
				case "Shift+g":
					app.users.End()
				case "/":
					app.searching = true
					app.filter.SetContent("")
					app.users.SetItems(app.allUsers)
				}
			} else {
				app.filter.Update(event)
				app.users.SetItems(filter(app.allUsers, app.filter.String()))
			}
		}
	}

	// render sidebar
	win := state.Window()
	w, h := win.Size()
	if len(app.users.Items()) > 0 {
		app.users.Draw(win.New(0, 0, 20, h-1))
	}

	// render search bar
	for x := 0; x < w; x++ {
		setCell(win, x, h-2, '─', vaxis.Style{})
	}
	if app.searching {
		app.filter.Draw(win.New(0, h-1, w, 1))
	} else {
		win.New(0, h-1, w, 1).Print(vaxis.Segment{Text: "press / to search users", Style: vaxis.Style{Foreground: vaxis.IndexColor(8)}})
	}

	// render page
	if len(app.users.Items()) == 0 {
		return
	}
	main := win.New(20, 0, w, h-2)
	if app.users.Items()[app.users.Index()] == "(home)" {
		// special homepage
		aligned := win.New(main.Width/2, main.Height/2-8, 47, 15)
		aligned.Print(vaxis.Segment{Text: string(homepage)})
	} else {
		// user page
		user := app.users.Items()[app.users.Index()][1:]
		art, _ := exec.Command("figlet", "-f", "script", user).CombinedOutput()
		main.Print(vaxis.Segment{Text: string(art)})
	}
}

func setCell(win vaxis.Window, x int, y int, r rune, st vaxis.Style) {
	win.SetCell(x, y, vaxis.Cell{
		Character: vaxis.Character{
			Grapheme: string([]rune{r}),
		},
		Style: st,
	})
}

func filter(users []string, query string) []string {
	var filtered []string
	for _, s := range users {
		if strings.Contains(s, query) {
			filtered = append(filtered, s)
		}
	}
	return filtered
}