package app

import (
	"bufio"
	"fmt"
	"os"
	"os/exec"
	"path"
	"strconv"
	"time"

	"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 MainMenu struct {
	title string
	list  ui.List
	help  string
}

const title = `   ___        __
  / _/__ ___ / /__
 / _/ -_) -_) (_-<
/_/ \__/\__/_/___/
    neofeels 0.1.0`

func NewMainMenu(index int) *MainMenu {
	return &MainMenu{
		title,
		ui.NewList([]string{
			"record some feels",
			"manage your feels",
			"check out your neighbors",
			"browse global feels",
			"visit your subscriptions",
			"scribble some graffiti",
			"change your settings",
			"see credits",
			"read documentation",
		}, index),
		"↑↓/kj move  ↵ enter  q exit",
	}
}

func (menu *MainMenu) 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", "q":
			close(ui.Quit)
		case "Down", "j", "Ctrl+n":
			menu.list.Down()
		case "Up", "k", "Ctrl+p":
			menu.list.Up()
		case "End", "Shift+g":
			menu.list.End()
		case "Home", "g":
			menu.list.Home()
		case "0", "1", "2", "3", "4", "5", "6", "7", "8":
			i, _ := strconv.Atoi(key.String())
			menu.list.SetIndex(i)
		case "Enter", "l", "Right":
			switch menu.list.Index() {
			case 0:
				newFeels(state)
			case 1:
				ui.ViewChange <- NewManagement(0)
			case 2:
				ui.ViewChange <- NewNeighbors(0)
			case 3:
				ui.ViewChange <- NewBrowse()
			case 4:
				ui.ViewChange <- NewSubscriptions(0)
			case 5:
				ui.ViewChange <- NewGraffiti()
			case 6:
				ui.ViewChange <- NewConfig()
			case 7:
				ui.ViewChange <- NewCredits()
			case 8:
				showManpage(state)
			}
		}
		processed = true
	}
	win := state.Window()
	win.New(win.Width/2-10, win.Height/2-8, 20, 5).Print(vaxis.Segment{Text: menu.title})
	menu.list.Draw(vaxis.Window{
		Vx:     win.Vx,
		Parent: nil,
		Column: win.Width/2 - 14,
		Row:    win.Height/2 - 2,
		Width:  28,
		Height: 10,
	})
	win.New(win.Width/2-14, win.Height/2+8, 28, 1).Print(vaxis.Segment{Text: menu.help})
	return
}

func showManpage(state *ui.State) {
	state.HideCursor()
	vt := term.New()
	vt.TERM = os.Getenv("TERM")
	vt.Attach(state.PostEvent())
	vt.Focus()
	err := vt.Start(exec.Command("man", "neofeels"))
	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
		}

		// for some reason vaxis doubles all events for Press/Release so this just ignores releases
		if key, ok := ev.(vaxis.Key); ok && key.EventType == vaxis.EventPress {
			vt.Update(ev)
		}
	}
}

func newFeels(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()
	now := time.Now()
	err := vt.Start(exec.Command(editor, path.Join(ttbp.PathUserEntries, now.Format("20060102")+".txt")))
	if err != nil {
		panic(err)
	}
	defer vt.Close()

	for ev := range state.Events() {
		switch ev.(type) {
		case term.EventClosed:
			state.HideCursor()
			state.Window().Clear()
			ttbp.NewNopub(now)
			ttbp.Publish()
			ui.ViewChange <- NewPosted()
			return
		case vaxis.Redraw:
			vt.Draw(state.Window())
			state.Render()
			continue
		}

		// for some reason vaxis doubles all events for Press/Release so this just ignores releases
		if key, ok := ev.(vaxis.Key); ok && key.EventType == vaxis.EventPress {
			vt.Update(ev)
		}
	}
}