package ui

import (
	"embed"
	"fmt"
	"io/fs"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/data/binding"
	"fyne.io/fyne/v2/dialog"
	"fyne.io/fyne/v2/widget"
	"gitea.hevanto-it.com/hevanto/ui/screen"
	"github.com/google/uuid"
	"github.com/nicksnyder/go-i18n/v2/i18n"
)

type DialogName string
type DialogKind string

type OnConfirmFn func(bool, error, ...interface{})
type NewDialogFn func(
	DialogName,
	DialogKind,
	fyne.Window,
	OnConfirmFn,
	binding.DataItem,
	*embed.FS,
	string,
	*i18n.Localizer) Dialog

const (
	DlgGeneric DialogKind = "Generic"
)

type Dialog interface {
	View

	Window() fyne.Window
	View() View

	SetInitialFocusItem(focusItem fyne.Focusable)

	Show(parent ...fyne.Window)
	OnClose(bool)

	DialogName() DialogName
	DialogKind() DialogKind
	OnConfirmFn() OnConfirmFn
}

type BaseDialog struct {
	id             string
	concreteDialog Dialog
	dlgName        DialogName
	dlgKind        DialogKind
	dlg            dialog.Dialog
	window         fyne.Window
	onConfirm      OnConfirmFn
	CanvasObj      fyne.CanvasObject
	Data           binding.DataItem
	focusItem      fyne.Focusable

	ViewModel DialogViewModel
	*ScreenHandler
}

func NewBaseDialog(
	concreteDialog Dialog,
	name DialogName,
	kind DialogKind,
	viewModel DialogViewModel,
	parent fyne.Window,
	confirm OnConfirmFn,
) *BaseDialog {
	return &BaseDialog{
		id:             uuid.NewString(),
		concreteDialog: concreteDialog,
		dlgName:        name,
		dlgKind:        kind,
		window:         parent,
		onConfirm:      confirm,
		ViewModel:      viewModel,
	}
}

func NewBaseDialogWithScreen(
	concreteDialog Dialog,
	name DialogName,
	kind DialogKind,
	viewModel DialogViewModel,
	parent fyne.Window,
	confirm OnConfirmFn,
	filesystem embed.FS,
	screenName string,
	localizer *i18n.Localizer,
	assetLoader func(string) (fs.File, error),
) *BaseDialog {
	d := NewBaseDialog(
		concreteDialog, name, kind, viewModel,
		parent, confirm)

	var err error
	d.ScreenHandler, err = NewDialogScreenHandler(
		filesystem, screenName, viewModel, localizer, assetLoader)
	if err != nil {
		LogWindowError(d, LoadScreen, err)
		return nil
	}
	return d
}

func NewBaseDialogWithData(
	concreteDialog Dialog,
	name DialogName,
	kind DialogKind,
	viewModel DialogViewModel,
	parent fyne.Window,
	confirm OnConfirmFn,
	data binding.DataItem,
) *BaseDialog {
	return &BaseDialog{
		id:             uuid.NewString(),
		concreteDialog: concreteDialog,
		dlgName:        name,
		dlgKind:        kind,
		window:         parent,
		onConfirm:      confirm,
		Data:           data,
		ViewModel:      viewModel,
	}
}

func NewBaseDialogWithDataAndScreen(
	concreteDialog Dialog,
	name DialogName,
	kind DialogKind,
	viewModel DialogViewModel,
	parent fyne.Window,
	confirm OnConfirmFn,
	data binding.DataItem,
	filesystem embed.FS,
	screenName string,
	localizer *i18n.Localizer,
	assetLoader func(string) (fs.File, error),
) *BaseDialog {
	d := NewBaseDialogWithData(
		concreteDialog, name, kind, viewModel,
		parent, confirm, data)

	var err error
	d.ScreenHandler, err = NewDialogScreenHandler(
		filesystem, screenName, viewModel, localizer, assetLoader)
	if err != nil {
		LogWindowError(d, LoadScreen, err)
		return nil
	}
	return d
}

func (d BaseDialog) Window() fyne.Window {
	return d.window
}

func (d *BaseDialog) View() View {
	return d
}

func (d BaseDialog) Equals(other View) bool {
	return d.id == other.ID()
}

func (d *BaseDialog) SetInitialFocusItem(focusItem fyne.Focusable) {
	d.focusItem = focusItem
}

func (d BaseDialog) DialogName() DialogName {
	return d.dlgName
}

func (d BaseDialog) DialogKind() DialogKind {
	return d.dlgKind
}

func (d BaseDialog) OnConfirmFn() OnConfirmFn {
	return d.onConfirm
}

func (d *BaseDialog) Show(parent ...fyne.Window) {

	d.concreteDialog.OnShow()
	d.dlg = dialog.NewCustomConfirm(
		d.concreteDialog.Title(),
		"OK", "Cancel",
		d.concreteDialog.Initialize(),
		d.concreteDialog.OnClose,
		d.window,
	)
	d.dlg.Show()
	d.dlg.Resize(fyne.NewSize(640, 480))
	if d.focusItem != nil {
		window := d.window
		if parent != nil {
			window = parent[0]
		}
		window.Canvas().Focus(d.focusItem)
	}
}

func (d BaseDialog) ID() string {
	return d.id
}

func (d *BaseDialog) SetID(id string) {
	d.id = id
}

func (d BaseDialog) Title() string {
	return ""
}

func (d *BaseDialog) Initialize() fyne.CanvasObject {
	if err := d.ViewModel.Initialize(d.Data); err != nil {
		LogWindowError(d, Initialize, err)
	}
	if d.ScreenHandler != nil && d.ScreenDefinition() != nil {
		obj, err := d.ScreenDefinition().Initialize()
		if err != nil {
			LogWindowError(d, Initialize, err)
			return nil
		}
		d.CanvasObj = obj.(*screen.DialogScreen).AsContainer()
	}
	return d.CanvasObj
}

func (d *BaseDialog) Refresh() {
	if d.CanvasObj != nil {
		d.CanvasObj.Refresh()
	}
}

func (d *BaseDialog) OnShow() {
	//LogWindowEvent(d, OnShow)
}

func (d *BaseDialog) OnHide() {
	//LogWindowEvent(d, OnHide)
}

func (d *BaseDialog) OnClose(confirmed bool) {
	LogWindowEventMessage(d, OnClose, fmt.Sprintf("confirmed: %v", confirmed))
	d.OnHide()
}

func (d *BaseDialog) GetCanvasObject() fyne.CanvasObject {
	return d.CanvasObj
}

func (d BaseDialog) PreventClose() bool {
	return false
}

type FormDialogItemsFn func() []*widget.FormItem

type FormDialog struct {
	*BaseDialog

	confirmLabel string
	dismissLabel string

	itemsFn FormDialogItemsFn
	items   []*widget.FormItem
}

func NewFormDialog(
	concreteDialog Dialog,
	name DialogName,
	kind DialogKind,
	viewModel DialogViewModel,
	parent fyne.Window,
	confirm OnConfirmFn,
	itemsFn FormDialogItemsFn,
) *FormDialog {
	return &FormDialog{
		BaseDialog: NewBaseDialog(
			concreteDialog, name, kind, viewModel, parent, confirm),
		itemsFn:      itemsFn,
		confirmLabel: "OK",
		dismissLabel: "Cancel",
	}
}

func NewFormDialogWithScreen(
	concreteDialog Dialog,
	name DialogName,
	kind DialogKind,
	viewModel DialogViewModel,
	parent fyne.Window,
	confirm OnConfirmFn,
	filesystem embed.FS,
	screenName string,
	localizer *i18n.Localizer,
	assetLoader func(string) (fs.File, error),
) *FormDialog {
	return &FormDialog{
		BaseDialog: NewBaseDialogWithScreen(
			concreteDialog, name, kind, viewModel, parent, confirm,
			filesystem, screenName, localizer, assetLoader),
		confirmLabel: "OK",
		dismissLabel: "Cancel",
	}
}

func NewformDialogWithData(
	concreteDialog Dialog,
	name DialogName,
	kind DialogKind,
	viewModel DialogViewModel,
	parent fyne.Window,
	confirm OnConfirmFn,
	itemsFn FormDialogItemsFn,
	data binding.DataItem,
) *FormDialog {
	return &FormDialog{
		BaseDialog: NewBaseDialogWithData(
			concreteDialog, name, kind, viewModel, parent, confirm, data),
		itemsFn:      itemsFn,
		confirmLabel: "OK",
		dismissLabel: "Cancel",
	}
}

func NewFormDialogWithDataAndScreen(
	concreteDialog Dialog,
	name DialogName,
	kind DialogKind,
	viewModel DialogViewModel,
	parent fyne.Window,
	confirm OnConfirmFn,
	data binding.DataItem,
	filesystem embed.FS,
	screenName string,
	localizer *i18n.Localizer,
	assetLoader func(string) (fs.File, error),
) *FormDialog {
	return &FormDialog{
		BaseDialog: NewBaseDialogWithDataAndScreen(
			concreteDialog, name, kind, viewModel, parent, confirm, data,
			filesystem, screenName, localizer, assetLoader),
		confirmLabel: "OK",
		dismissLabel: "Cancel",
	}
}

func (d *FormDialog) SetButtonLabels(
	confirm string,
	dismiss string,
) {
	d.confirmLabel = confirm
	d.dismissLabel = dismiss
}

func (d *FormDialog) Initialize() fyne.CanvasObject {
	if d.itemsFn == nil {
		form := d.BaseDialog.Initialize().(*fyne.Container)
		d.itemsFn = func() []*widget.FormItem {
			res := make([]*widget.FormItem, 0, len(form.Objects)/2)
			for i := 0; i < len(form.Objects); i += 2 {
				res = append(res, widget.NewFormItem(
					form.Objects[i].(*widget.Label).Text,
					form.Objects[i+1]))
			}
			return res
		}
		return nil
	}
	return nil
}

func (d *FormDialog) Show(parent ...fyne.Window) {
	d.concreteDialog.Initialize()
	d.items = d.itemsFn()

	d.concreteDialog.OnShow()
	frm := dialog.NewForm(
		d.concreteDialog.Title(),
		d.confirmLabel,
		d.dismissLabel,
		d.items,
		d.concreteDialog.OnClose,
		d.window,
	)
	d.dlg = frm
	d.dlg.Show()
	d.dlg.Resize(fyne.NewSize(640, 480))
	if d.focusItem != nil {
		window := d.window
		if parent != nil {
			window = parent[0]
		}
		window.Canvas().Focus(d.focusItem)
	}
}

func (d *FormDialog) Refresh() {
	for _, itm := range d.items {
		itm.Widget.Refresh()
	}
}

var dialogCatalog map[DialogName]map[DialogKind]NewDialogFn

func RegisterDialog(name DialogName, kind DialogKind, fn NewDialogFn) {
	if dialogCatalog == nil {
		dialogCatalog = make(map[DialogName]map[DialogKind]NewDialogFn)
	}
	if _, ok := dialogCatalog[name]; !ok {
		dialogCatalog[name] = make(map[DialogKind]NewDialogFn)
	}
	dialogCatalog[name][kind] = fn
}

func NewDialog(
	name DialogName,
	kind DialogKind,
	parent fyne.Window,
	confirm OnConfirmFn,
) Dialog {
	if dialogCatalog == nil {
		return nil
	}
	if kindCatalog, ok := dialogCatalog[name]; ok {
		if fn, ok := kindCatalog[kind]; ok {
			return fn(name, kind, parent, confirm, nil, nil, "", nil)
		}
	}
	return nil
}

func NewDialogWithScreen(
	name DialogName,
	kind DialogKind,
	parent fyne.Window,
	confirm OnConfirmFn,
	filesystem embed.FS,
	screenName string,
	localizer *i18n.Localizer,
) Dialog {
	if dialogCatalog == nil {
		return nil
	}
	if kindCatalog, ok := dialogCatalog[name]; ok {
		if fn, ok := kindCatalog[kind]; ok {
			return fn(
				name, kind, parent, confirm, nil,
				&filesystem, screenName, localizer)
		}
	}
	return nil
}

func NewDialogWithData(
	name DialogName,
	kind DialogKind,
	parent fyne.Window,
	confirm OnConfirmFn,
	data binding.DataItem,
) Dialog {
	if dialogCatalog == nil {
		return nil
	}
	if kindCatalog, ok := dialogCatalog[name]; ok {
		if fn, ok := kindCatalog[kind]; ok {
			return fn(name, kind, parent, confirm, data, nil, "", nil)
		}
	}
	return nil
}

func NewDialogWithDataAndScreen(
	name DialogName,
	kind DialogKind,
	parent fyne.Window,
	confirm OnConfirmFn,
	data binding.DataItem,
	filesystem embed.FS,
	screenName string,
	localizer *i18n.Localizer,
) Dialog {
	if dialogCatalog == nil {
		return nil
	}
	if kindCatalog, ok := dialogCatalog[name]; ok {
		if fn, ok := kindCatalog[kind]; ok {
			return fn(
				name, kind, parent, confirm, data,
				&filesystem, screenName, localizer)
		}
	}
	return nil
}

func ShowConfirmDialog(
	title string,
	message string,
	lblOk string,
	lblCancel string,
	callback func(bool),
	parent fyne.Window,
) {
	label := widget.NewLabel(message)
	label.Wrapping = fyne.TextWrapBreak
	dlg := dialog.NewCustomConfirm(
		title, lblOk, lblCancel,
		label, callback, parent)
	dlg.Resize(fyne.NewSize(480, 100))
	dlg.Show()
}