package controller

import (
	"image"
	"log"
	"supersonic/backend"
	"supersonic/ui/dialogs"
	"supersonic/ui/util"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/canvas"
	"fyne.io/fyne/v2/dialog"
	"fyne.io/fyne/v2/widget"
)

type Controller struct {
	MainWindow fyne.Window
	App        *backend.App
}

func (m Controller) ShowPopUpImage(img image.Image) {
	im := canvas.NewImageFromImage(img)
	im.FillMode = canvas.ImageFillContain
	pop := widget.NewPopUp(im, m.MainWindow.Canvas())
	s := m.MainWindow.Canvas().Size()
	var popS fyne.Size
	if asp := util.ImageAspect(img); s.Width/s.Height > asp {
		// window height is limiting factor
		h := s.Height * 0.8
		popS = fyne.NewSize(h*asp, h)
	} else {
		w := s.Width * 0.8
		popS = fyne.NewSize(w, w*(1/asp))
	}
	pop.Resize(popS)
	pop.ShowAtPosition(fyne.NewPos(
		(s.Width-popS.Width)/2,
		(s.Height-popS.Height)/2,
	))
}

func (m Controller) PromptForFirstServer() {
	d := dialogs.NewAddEditServerDialog("Connect to Server", nil)
	pop := widget.NewModalPopUp(d, m.MainWindow.Canvas())
	d.OnSubmit = func() {
		if m.testConnectionAndUpdateDialogError(d) {
			// connection is good
			pop.Hide()
			server := m.App.Config.AddServer(d.Nickname, d.Host, d.Username)
			if err := m.App.ServerManager.SetServerPassword(server, d.Password); err != nil {
				log.Printf("error setting keyring credentials: %v", err)
				// TODO: handle?
			}
			m.DoConnectToServerWorkflow(server)
		}
	}
	pop.Show()
}

// Show dialog to prompt for playlist.
// Depending on the results of that dialog, potentially create a new playlist
// Add tracks to the user-specified playlist
func (m Controller) DoAddTracksToPlaylistWorkflow(trackIDs []string) {
	pls, err := m.App.LibraryManager.GetUserOwnedPlaylists()
	if err != nil {
		// TODO: surface this error to user
		log.Printf("error getting user-owned playlists: %s", err.Error())
		return
	}
	plNames := make([]string, 0, len(pls))
	for _, pl := range pls {
		plNames = append(plNames, pl.Name)
	}

	dlg := dialogs.NewAddToPlaylistDialog("Add to Playlist", plNames)
	pop := widget.NewModalPopUp(dlg, m.MainWindow.Canvas())
	dlg.OnCanceled = pop.Hide
	dlg.OnSubmit = func(playlistChoice int, newPlaylistName string) {
		pop.Hide()
		if playlistChoice < 0 {
			m.App.ServerManager.Server.CreatePlaylistWithTracks(
				trackIDs, map[string]string{"name": newPlaylistName})
		} else {
			m.App.ServerManager.Server.UpdatePlaylistTracks(
				pls[playlistChoice].ID, trackIDs, nil /*tracksToRemove*/)
		}
	}
	pop.Show()
}

func (c Controller) DoConnectToServerWorkflow(server *backend.ServerConfig) {
	pass, err := c.App.ServerManager.GetServerPassword(server)
	if err != nil {
		log.Printf("error getting password from keyring: %v", err)
		c.PromptForLoginAndConnect()
	} else {
		if err := c.tryConnectToServer(server, pass); err != nil {
			dlg := dialog.NewError(err, c.MainWindow)
			dlg.SetOnClosed(func() {
				c.PromptForLoginAndConnect()
			})
			dlg.Show()
		}
	}
}

func (m Controller) PromptForLoginAndConnect() {
	// TODO: this will need to be rewritten a bit when we support multi servers
	// need to make sure the intended server is first in the list passed to NewLoginDialog
	d := dialogs.NewLoginDialog(m.App.Config.Servers)
	pop := widget.NewModalPopUp(d, m.MainWindow.Canvas())
	d.OnSubmit = func(server *backend.ServerConfig, password string) {
		err := m.App.ServerManager.TestConnectionAndAuth(server.Hostname, server.Username, password)
		if err == backend.ErrUnreachable {
			d.SetErrorText("Server unreachable")
		} else if err != nil {
			d.SetErrorText("Authentication failed")
		} else {
			pop.Hide()
			m.trySetPasswordAndConnectToServer(server, password)
		}
	}
	d.OnEditServer = func(server *backend.ServerConfig) {
		pop.Hide()
		editD := dialogs.NewAddEditServerDialog("Edit server", server)
		editPop := widget.NewModalPopUp(editD, m.MainWindow.Canvas())
		editD.OnSubmit = func() {
			if m.testConnectionAndUpdateDialogError(editD) {
				// connection is good
				editPop.Hide()
				server.Hostname = editD.Host
				server.Nickname = editD.Nickname
				server.Username = editD.Username
				m.trySetPasswordAndConnectToServer(server, editD.Password)
			}
		}
		editPop.Show()
	}
	pop.Show()
}

func (c Controller) trySetPasswordAndConnectToServer(server *backend.ServerConfig, password string) error {
	if err := c.App.ServerManager.SetServerPassword(server, password); err != nil {
		log.Printf("error setting keyring credentials: %v", err)
		// TODO: how best to handle this unexpected codepath
		// fall back to prompting for password on each run of the app?
		return err
	}
	return c.tryConnectToServer(server, password)
}

func (c Controller) tryConnectToServer(server *backend.ServerConfig, password string) error {
	if err := c.App.ServerManager.TestConnectionAndAuth(server.Hostname, server.Username, password); err != nil {
		return err
	}
	if err := c.App.ServerManager.ConnectToServer(server, password); err != nil {
		log.Printf("error connecting to server: %v", err)
		return err
	}
	return nil
}

func (c Controller) testConnectionAndUpdateDialogError(dlg *dialogs.AddEditServerDialog) bool {
	err := c.App.ServerManager.TestConnectionAndAuth(dlg.Host, dlg.Username, dlg.Password)
	if err == backend.ErrUnreachable {
		dlg.SetErrorText("Could not reach server (wrong hostname?)")
		return false
	} else if err != nil {
		dlg.SetErrorText("Authentication failed (wrong username/password)")
		return false
	}
	return true
}