package app

import (
	"bufio"
	"fmt"
	"os"
	"os/exec"

	"git.sr.ht/~rockorager/vaxis"
	"git.sr.ht/~rockorager/vaxis/widgets/term"
	"git.tilde.town/nbsp/neofeels/ttbp"
	"git.tilde.town/nbsp/neofeels/ui"
)

type Graffiti struct {
	title   string
	content string
	help    string
}

func NewGraffiti() *Graffiti {
	var content string
	if ttbp.GraffitiFree() {
		content = `the graffiti wall is a world-writeable text file. anyone can scribble on it;
anyone can move or delete things. please be considerate of your neighbors when
writing on it.

no one will be able to visit the wall while you are here, so don't worry about
overwriting someone else's work. anything you do to the wall will be recorded if
you save the file, and you can cancel your changes by exiting without saving.`
	} else {
		content = "sorry, but someone's there right now. try again in a few!"
	}
	return &Graffiti{
		title,
		content,
		"↵ enter  q return",
	}
}

func (graffiti *Graffiti) Event(state *ui.State, event vaxis.Event) (processed bool) {
	if key, ok := event.(vaxis.Key); ok && key.EventType == vaxis.EventPress {
		switch key.String() {
		case "Ctrl+c", "Ctrl+d":
			close(ui.Quit)
		case "q", "h", "Left":
			ui.ViewChange <- NewMainMenu(5)
		case "Enter", "l", "Right":
			if ttbp.GraffitiFree() {
				os.Create(ttbp.PathWallLock)
				editGraffiti(state)
				os.Remove(ttbp.PathWallLock)
			}
			ui.ViewChange <- NewMainMenu(5)
		}
		processed = true
	}
	win := state.Window()
	win.New(win.Width/2-10, win.Height/2-8, 20, 5).Print(vaxis.Segment{Text: graffiti.title})
	win.New(win.Width/2-40, win.Height/2-2, 81, 9).Print(vaxis.Segment{Text: graffiti.content})
	win.New(win.Width/2-9, win.Height/2+8, 18, 1).Print(vaxis.Segment{Text: graffiti.help})
	return
}

func editGraffiti(state *ui.State) {
	// if $EDITOR isn't set, warn about it, and use nano
	editor := os.ExpandEnv(os.Getenv("EDITOR"))
	if editor == "" {
		editor = "nano"
		state.Suspend()
		fmt.Print("$EDITOR not found, using nano. press ↵ to continue")
		input := bufio.NewScanner(os.Stdin)
		input.Scan()
		state.Resume()
	}

	state.HideCursor()
	vt := term.New()
	vt.TERM = os.Getenv("TERM")
	vt.Attach(state.PostEvent())
	vt.Focus()
	err := vt.Start(exec.Command(os.ExpandEnv(os.Getenv("EDITOR")), ttbp.PathWall))
	if err != nil {
		panic(err)
	}
	defer vt.Close()

	for ev := range state.Events() {
		switch ev.(type) {
		case term.EventClosed:
			state.HideCursor()
			state.Window().Clear()
			return
		case vaxis.Redraw:
			vt.Draw(state.Window())
			state.Render()
			continue
		}

		vt.Update(ev)
	}
}