// Command gio-spike validates a Gio window for the V2 UI, bypassing the Walk
// TTM_ADDTOOL startup failure (Gio uses no Win32 common controls, so the
// manifest/comctl issue cannot occur). It shows a synthetic RGBA frame — the
// same *image.RGBA type internal/render produces — a top dual-tab bar and a
// start/stop button, then closes cleanly.
//
// Run on Windows: go run ./cmd/gio-spike
package main

import (
	"image"
	"image/color"
	"log"
	"os"

	"gioui.org/app"
	"gioui.org/font/gofont"
	"gioui.org/layout"
	"gioui.org/op"
	"gioui.org/op/paint"
	"gioui.org/text"
	"gioui.org/unit"
	"gioui.org/widget"
	"gioui.org/widget/material"
)

func main() {
	go func() {
		w := new(app.Window)
		w.Option(
			app.Title("Silver Pose V2 · Gio Spike"),
			app.Size(unit.Dp(960), unit.Dp(600)),
		)
		if err := loop(w); err != nil {
			log.Fatal(err)
		}
		os.Exit(0)
	}()
	app.Main()
}

type spikeUI struct {
	theme     *material.Theme
	frame     paint.ImageOp
	tabs      []string
	tabButton []widget.Clickable
	active    int
	startStop widget.Clickable
	running   bool
}

func newSpikeUI() *spikeUI {
	theme := material.NewTheme()
	theme.Shaper = text.NewShaper(text.WithCollection(gofont.Collection()))
	ui := &spikeUI{
		theme: theme,
		frame: paint.NewImageOp(syntheticFrame(640, 360)),
		tabs:  []string{"实时监控", "设置"},
	}
	ui.tabButton = make([]widget.Clickable, len(ui.tabs))
	return ui
}

func loop(w *app.Window) error {
	ui := newSpikeUI()
	var ops op.Ops
	for {
		switch e := w.Event().(type) {
		case app.DestroyEvent:
			return e.Err
		case app.FrameEvent:
			gtx := app.NewContext(&ops, e)
			ui.layout(gtx)
			e.Frame(gtx.Ops)
		}
	}
}

func (ui *spikeUI) layout(gtx layout.Context) layout.Dimensions {
	paint.Fill(gtx.Ops, color.NRGBA{R: 0xEA, G: 0xF1, B: 0xF8, A: 0xFF})
	return layout.Flex{Axis: layout.Vertical}.Layout(gtx,
		layout.Rigid(ui.layoutTabs),
		layout.Flexed(1, ui.layoutBody),
		layout.Rigid(ui.layoutControls),
	)
}

func (ui *spikeUI) layoutTabs(gtx layout.Context) layout.Dimensions {
	for i := range ui.tabButton {
		if ui.tabButton[i].Clicked(gtx) {
			ui.active = i
		}
	}
	children := make([]layout.FlexChild, 0, len(ui.tabs))
	for i := range ui.tabs {
		i := i
		children = append(children, layout.Rigid(func(gtx layout.Context) layout.Dimensions {
			button := material.Button(ui.theme, &ui.tabButton[i], ui.tabs[i])
			if i != ui.active {
				button.Background = color.NRGBA{R: 0xFF, G: 0xFF, B: 0xFF, A: 0xFF}
				button.Color = color.NRGBA{R: 0x52, G: 0x65, B: 0x7C, A: 0xFF}
			}
			return layout.UniformInset(unit.Dp(6)).Layout(gtx, button.Layout)
		}))
	}
	return layout.Flex{}.Layout(gtx, children...)
}

func (ui *spikeUI) layoutBody(gtx layout.Context) layout.Dimensions {
	if ui.active == 0 {
		return layout.UniformInset(unit.Dp(8)).Layout(gtx, func(gtx layout.Context) layout.Dimensions {
			return widget.Image{
				Src:      ui.frame,
				Fit:      widget.Contain,
				Position: layout.Center,
			}.Layout(gtx)
		})
	}
	return layout.Center.Layout(gtx, material.Body1(ui.theme, "设置页占位（spike）").Layout)
}

func (ui *spikeUI) layoutControls(gtx layout.Context) layout.Dimensions {
	if ui.startStop.Clicked(gtx) {
		ui.running = !ui.running
	}
	label := "开始监控"
	if ui.running {
		label = "停止监控"
	}
	return layout.UniformInset(unit.Dp(8)).Layout(gtx, material.Button(ui.theme, &ui.startStop, label).Layout)
}

// syntheticFrame stands in for internal/render's *image.RGBA output: a gradient
// with a 6px red border, mimicking a CONFIRMED overlay, to prove image display.
func syntheticFrame(width, height int) *image.RGBA {
	img := image.NewRGBA(image.Rect(0, 0, width, height))
	for y := 0; y < height; y++ {
		for x := 0; x < width; x++ {
			img.SetRGBA(x, y, color.RGBA{
				R: uint8(x * 255 / width),
				G: uint8(y * 255 / height),
				B: 90,
				A: 255,
			})
		}
	}
	red := color.RGBA{R: 198, G: 40, B: 40, A: 255}
	for t := 0; t < 6; t++ {
		for x := 0; x < width; x++ {
			img.SetRGBA(x, t, red)
			img.SetRGBA(x, height-1-t, red)
		}
		for y := 0; y < height; y++ {
			img.SetRGBA(t, y, red)
			img.SetRGBA(width-1-t, y, red)
		}
	}
	return img
}