package gioui

import (
	"context"
	"sync/atomic"

	"forge.cadoles.com/arcad/arcast/pkg/browser"
	"gioui.org/app"
	"gioui.org/f32"
	"gioui.org/layout"
	"github.com/gioui-plugins/gio-plugins/webviewer"
	"gitlab.com/wpetit/goweb/logger"
)

type Browser struct {
	window *app.Window
	tag    int

	url     *atomic.Value
	changed *atomic.Bool
	status  *atomic.Value
	title   *atomic.Value
}

func (b *Browser) Layout(gtx layout.Context) layout.Dimensions {
	events := gtx.Events(&b.tag)
	for _, evt := range events {
		switch ev := evt.(type) {
		case webviewer.TitleEvent:
			b.title.Store(ev.Title)
		case webviewer.NavigationEvent:
			b.url.Store(ev.URL)
		}
	}

	ctx := context.Background()
	logger.Debug(ctx, "drawing")

	webviewer.WebViewOp{Tag: &b.tag}.Push(gtx.Ops)

	webviewer.OffsetOp{
		Point: f32.Point{
			X: 0,
			Y: 0,
		},
	}.Add(gtx.Ops)

	webviewer.RectOp{
		Size: f32.Point{
			X: float32(gtx.Constraints.Max.X),
			Y: float32(gtx.Constraints.Max.Y),
		},
	}.Add(gtx.Ops)

	if b.changed.CompareAndSwap(true, false) {
		url := b.url.Load().(string)
		logger.Debug(ctx, "url changed", logger.F("url", url))
		webviewer.NavigateOp{URL: url}.Add(gtx.Ops)
	}

	return layout.Dimensions{Size: gtx.Constraints.Max}
}

// Load implements browser.Browser.
func (b *Browser) Load(url string) error {
	b.url.Store(url)
	b.changed.Store(true)
	b.status.Store(browser.StatusCasting)

	b.window.Invalidate()

	return nil
}

// Status implements browser.Browser.
func (b *Browser) Status() (browser.Status, error) {
	return b.status.Load().(browser.Status), nil
}

// Title implements browser.Browser.
func (b *Browser) Title() (string, error) {
	return b.title.Load().(string), nil
}

// URL implements browser.Browser.
func (b *Browser) URL() (string, error) {
	return b.url.Load().(string), nil
}

// Reset implements browser.Browser.
func (b *Browser) Reset(url string) error {
	b.url.Store(url)
	b.changed.Store(true)
	b.status.Store(browser.StatusIdle)

	b.window.Invalidate()

	return nil
}

func NewBrowser(window *app.Window) *Browser {
	b := &Browser{
		window:  window,
		url:     &atomic.Value{},
		changed: &atomic.Bool{},
		status:  &atomic.Value{},
		title:   &atomic.Value{},
	}

	b.url.Store("")
	b.title.Store("")
	b.changed.Store(false)
	b.status.Store(browser.StatusIdle)

	return b
}

var _ browser.Browser = &Browser{}