package navigation

import (
	"log/slog"

	"github.com/egoist/mygo/ui"

	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
)

var cross = pixel.MustSprite(`
	#...#
	.#.#.
	..#..
	.#.#.
	#...#
`)

type DocumentTabsOptions struct {
	Disabled bool
}

type DocumentTabsResult struct {
	Element *ui.Element
	Changed bool
	// Closed is the tab × or Delete closed, or -1.
	Closed int
}

// DocumentTabs are closable tabs; × or Delete reports Closed.
func DocumentTabs(c *ui.Context, text string, titles []string, selected *int, o DocumentTabsOptions) DocumentTabsResult {
	k := pixel.K(c)
	res := DocumentTabsResult{Closed: -1}
	p := ui.TabsBase(c, selected, len(titles))
	p.List.Label(text).Children(func() {
		for i, t := range titles {
			var x *ui.Element
			shell, base, st := pixel.Shell(c, func() *ui.Element {
				tab := p.Tab(i).Label(t).Disabled(o.Disabled)
				// The × is no Tab stop; Delete closes by keyboard.
				tab.Children(func() {
					x = ui.Box(c).Absolute().Right(k.D(4)).Top(k.D(6)).Size(k.D(7), k.D(7)).Role(ui.RoleButton).Label(k.Msg("close") + " " + t)
				})
				return tab
			})
			if x.Clicked() || base.Shortcut(0, ui.KeyDelete) {
				res.Closed = i
			}
			hot := x.Hovered()
			shell.Size(k.D(pixel.Measure(t)+24), k.D(pixel.LineHeight+6)).Draw(func(p *ui.Painter, r ui.Rect) {
				g := k.Canvas(p, r)
				folder(g, t, i == *selected, false, st)
				ink := pixel.Faint
				if hot {
					ink = pixel.Bad
				}
				g.Sprite(g.W-10, 7, cross, 0, ink, 1)
			})
		}
	})
	res.Element, res.Changed = p.List, p.List.Changed()
	if res.Closed >= 0 {
		slog.Debug("8bit: tab closed", "label", text, "tab", titles[res.Closed])
	}
	return res
}