// Copyright 2022 wanderer <a_mirre at utb dot cz>
// SPDX-License-Identifier: GPL-3.0-or-later

package xkcdreader

import (
	"fmt"
	"log"
	"os"
	"time"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/canvas"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/layout"
	"fyne.io/fyne/v2/theme"
	"fyne.io/fyne/v2/widget"
	"git.dotya.ml/wanderer/go-xkcdreader/cmd"
)

const appGreeting = "welcome to go-xkcdreader"

var a fyne.App

// RunApp performs sets up and runs the main application.
func RunApp() {
	// initialize the fyne application
	newApp()

	goxkcdreader := getApp()
	w := goxkcdreader.NewWindow(cmd.GetAppName())

	// mark this window as the main window
	w.SetMaster()

	centered := container.New(
		layout.NewHBoxLayout(),
		layout.NewSpacer(),
		makeGreeting(),
		layout.NewSpacer(),
	)

	w.SetContent(container.New(
		layout.NewVBoxLayout(),
		makeToolbar(),
		centered,
		makeTabs(),
	))

	w.Resize(fyne.NewSize(400, 400))
	w.ShowAndRun()
}

func newApp() {
	a = app.New()

	log.Println("Created a new fyne application")
}

func getApp() fyne.App {
	return a
}

// makeGreeting creates a greeting label.
func makeGreeting() *widget.Label {
	w := widget.NewLabel(appGreeting)
	w.TextStyle.Monospace = true

	return w
}

func makeToolbar() *widget.Toolbar {
	toolbar := widget.NewToolbar(
		widget.NewToolbarSpacer(),
		widget.NewToolbarAction(theme.HelpIcon(), func() {
			log.Println("Display help")
		}),
		widget.NewToolbarAction(theme.SettingsIcon(), func() {
			log.Println("Display settings")
		}),
		widget.NewToolbarAction(theme.InfoIcon(), aboutWindow),
	)

	return toolbar
}

func makeTabs() *container.AppTabs {
	tabs := container.NewAppTabs(
		container.NewTabItem("browse", makeBrowseUI()),
		container.NewTabItem("what if?", widget.NewLabel("serious answers to absurd questions and absurd advice for common concerns from xkcd's Randall Munroe")),
		container.NewTabItemWithIcon("search", theme.SearchIcon(), makeSearchTab()),
	)

	return tabs
}

func makeBrowseUI() *fyne.Container {
	imgPath := "xkcdreader/assets/comic.png"

	// container for the image and surrounding elements
	imgC := container.New(
		layout.NewHBoxLayout(),
		widget.NewButtonWithIcon("", theme.NavigateBackIcon(), func() {
			log.Println("Previous comic")
		}),
		layout.NewSpacer(),
		container.NewCenter(
			// TODO(me): dynamically replace placeholder text with image once
			// fetched...
			// widget.NewLabel("img placeholder"),
			getImg(imgPath),
		),
		layout.NewSpacer(),
		widget.NewButtonWithIcon("", theme.NavigateNextIcon(), func() {
			log.Println("Next comic")
		}),
	)

	browseUI := container.New(
		layout.NewVBoxLayout(),
		layout.NewSpacer(),
		container.NewCenter(
			container.NewVBox(
				&widget.Label{Text: "published on " + fmt.Sprint(time.Now().Date()), TextStyle: fyne.TextStyle{Italic: true}},
				container.NewHBox(
					&widget.Label{Text: "Comic Title", TextStyle: fyne.TextStyle{Bold: true}},
					&widget.Label{Text: "(#1234)", TextStyle: fyne.TextStyle{Monospace: true}},
				),
			),
		),
		imgC,
		layout.NewSpacer(),
		container.NewCenter(
			&widget.Label{Text: "Comic 'title text'", TextStyle: fyne.TextStyle{Italic: true}},
		),
	)

	return browseUI
}

// get img from filesystem, resize it and return as *canvas.Image.
func getImg(imgPath string) *canvas.Image {
	_, err := os.Stat(imgPath)
	// properly handle error, perhaps panic?...don't panic, I know..
	if err != nil {
		log.Println("failed to read file " + imgPath)
		return canvas.NewImageFromFile("")
	}

	img := canvas.NewImageFromFile(imgPath)

	img.SetMinSize(
		fyne.Size{
			Height: 383,
			Width:  273,
		},
	)

	return img
}