Refactor application structure and initialize core components

I decided to rewrite the program taking into account the experience gained.

internal/controller/convertor.go

@@ -0,0 +1,8 @@
+package controller
+
+import "git.kor-elf.net/kor-elf/gui-for-ffmpeg/internal/gui/view"
+
+func (c *controller) convertor() {
+	content := view.Convertor()
+	c.window.SetContent(content)
+}

internal/controller/error.go

@@ -0,0 +1,16 @@
+package controller
+
+import (
+	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/internal/application/setting"
+	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/internal/gui/view"
+)
+
+func (c *controller) startWithError(err error) {
+	languages := c.app.GetSetting().GetLanguages()
+
+	content := view.StartWithError(err, languages, func(lang setting.Lang) {
+		_ = setting.ChangeLang(lang)
+		c.startWithError(err)
+	})
+	c.window.SetContent(content)
+}

internal/controller/main.go

@@ -0,0 +1,64 @@
+package controller
+
+import (
+	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/internal/application"
+	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/internal/application/setting"
+	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/internal/gui/view"
+	"git.kor-elf.net/kor-elf/gui-for-ffmpeg/internal/gui/window"
+)
+
+type ControllerContract interface {
+	Start()
+}
+
+type controller struct {
+	app    application.AppContract
+	window window.MainWindowContract
+}
+
+func NewController(app application.AppContract) ControllerContract {
+	fyneWindow := app.FyneApp().NewWindow(app.FyneApp().Metadata().Name)
+
+	return &controller{
+		app:    app,
+		window: window.NewMainWindow(fyneWindow, app.GetProgressBarService()),
+	}
+}
+
+func (c *controller) Start() {
+	c.window.Show()
+
+	isDefault, err := c.initLanguage()
+	if err != nil {
+		c.startWithError(err)
+		return
+	}
+
+	if isDefault {
+		languages := c.app.GetSetting().GetLanguages()
+		content := view.StartWithoutSupportLang(languages, func(lang setting.Lang) {
+			err = c.app.GetSetting().SetLang(lang)
+			if err != nil {
+				c.startWithError(err)
+				return
+			}
+			c.window.InitLayout()
+			c.verificareaFFmpeg()
+		})
+		c.window.SetContent(content)
+		return
+	}
+
+	c.window.InitLayout()
+	c.verificareaFFmpeg()
+}
+
+func (c *controller) verificareaFFmpeg() {
+	c.convertor()
+}
+
+func (c *controller) initLanguage() (isDefault bool, err error) {
+	lang, isDefault := c.app.GetSetting().GetCurrentLangOrDefaultLang()
+	err = setting.ChangeLang(lang)
+	return isDefault, err
+}