package gioui

import (
	"context"
	"sync"

	"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     string
	changed bool

	status browser.Status
	title  string

	mutex sync.Mutex
}

func (b *Browser) Layout(gtx layout.Context) {
	b.mutex.Lock()
	defer b.mutex.Unlock()

	events := gtx.Events(&b.tag)
	for _, evt := range events {
		switch ev := evt.(type) {
		case webviewer.TitleEvent:
			b.title = ev.Title
		case webviewer.NavigationEvent:
			b.url = ev.URL
		}
	}

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

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

	webviewer.OffsetOp{Point: f32.Point{Y: float32(gtx.Constraints.Max.Y - gtx.Constraints.Max.Y)}}.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 {
		logger.Debug(ctx, "url changed", logger.F("url", b.url))
		webviewer.NavigateOp{URL: b.url}.Add(gtx.Ops)
		b.changed = false
	}
}

// Load implements browser.Browser.
func (b *Browser) Load(url string) error {
	b.mutex.Lock()
	defer b.mutex.Unlock()

	b.url = url
	b.changed = true
	b.status = browser.StatusCasting

	b.window.Invalidate()

	return nil
}

// Status implements browser.Browser.
func (b *Browser) Status() (browser.Status, error) {
	b.mutex.Lock()
	defer b.mutex.Unlock()

	return b.status, nil
}

// Title implements browser.Browser.
func (b *Browser) Title() (string, error) {
	b.mutex.Lock()
	defer b.mutex.Unlock()

	return b.title, nil
}

// URL implements browser.Browser.
func (b *Browser) URL() (string, error) {
	b.mutex.Lock()
	defer b.mutex.Unlock()

	return b.url, nil
}

// Reset implements browser.Browser.
func (b *Browser) Reset(url string) error {
	b.mutex.Lock()
	defer b.mutex.Unlock()

	b.url = url
	b.changed = true
	b.status = browser.StatusIdle

	b.window.Invalidate()

	return nil
}

func NewBrowser(window *app.Window) *Browser {
	return &Browser{
		window:  window,
		url:     "",
		changed: true,
		status:  browser.StatusIdle,
	}
}

var _ browser.Browser = &Browser{}