// lots of this has been directly ported from one of the example files, will brush up later

// Copyright 2014 The gocui Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package gui

import (
	"strings"

	"github.com/fatih/color"
	"github.com/jesseduffield/gocui"
)

func (gui *Gui) wrappedConfirmationFunction(function func(*gocui.Gui, *gocui.View) error) func(*gocui.Gui, *gocui.View) error {
	return func(g *gocui.Gui, v *gocui.View) error {
		if function != nil {
			if err := function(g, v); err != nil {
				return err
			}
		}
		return gui.closeConfirmationPrompt()
	}
}

func (gui *Gui) closeConfirmationPrompt() error {
	view, err := gui.g.View("confirmation")
	if err != nil {
		return nil // if it's already been closed we can just return
	}
	if err := gui.returnFocus(gui.g, view); err != nil {
		return err
	}
	gui.g.DeleteViewKeybindings("confirmation")
	return gui.g.DeleteView("confirmation")
}

func (gui *Gui) getMessageHeight(wrap bool, message string, width int) int {
	lines := strings.Split(message, "\n")
	lineCount := 0
	// if we need to wrap, calculate height to fit content within view's width
	if wrap {
		for _, line := range lines {
			lineCount += len(line)/width + 1
		}
	} else {
		lineCount = len(lines)
	}
	return lineCount
}

func (gui *Gui) getConfirmationPanelDimensions(g *gocui.Gui, wrap bool, prompt string) (int, int, int, int) {
	width, height := g.Size()
	panelWidth := width / 2
	panelHeight := gui.getMessageHeight(wrap, prompt, panelWidth)
	return width/2 - panelWidth/2,
		height/2 - panelHeight/2 - panelHeight%2 - 1,
		width/2 + panelWidth/2,
		height/2 + panelHeight/2
}

func (gui *Gui) createPromptPanel(g *gocui.Gui, currentView *gocui.View, title string, handleConfirm func(*gocui.Gui, *gocui.View) error) error {
	gui.onNewPopupPanel()
	confirmationView, err := gui.prepareConfirmationPanel(currentView, title, "", false)
	if err != nil {
		return err
	}
	confirmationView.Editable = true
	return gui.setKeyBindings(g, handleConfirm, nil)
}

func (gui *Gui) prepareConfirmationPanel(currentView *gocui.View, title, prompt string, hasLoader bool) (*gocui.View, error) {
	x0, y0, x1, y1 := gui.getConfirmationPanelDimensions(gui.g, true, prompt)
	confirmationView, err := gui.g.SetView("confirmation", x0, y0, x1, y1, 0)
	if err != nil {
		if err.Error() != "unknown view" {
			return nil, err
		}
		confirmationView.HasLoader = hasLoader
		gui.g.StartTicking()
		confirmationView.Title = title
		confirmationView.Wrap = true
		confirmationView.FgColor = gocui.ColorWhite
	}
	gui.g.Update(func(g *gocui.Gui) error {
		return gui.switchFocus(gui.g, currentView, confirmationView, false)
	})
	return confirmationView, nil
}

func (gui *Gui) onNewPopupPanel() {
	viewNames := []string{
		"commitMessage",
		"credentials",
		"menu",
	}
	for _, viewName := range viewNames {
		_, _ = gui.g.SetViewOnBottom(viewName)
	}
}

// it is very important that within this function we never include the original prompt in any error messages, because it may contain e.g. a user password
func (gui *Gui) createConfirmationPanel(g *gocui.Gui, currentView *gocui.View, title, prompt string, handleConfirm, handleClose func(*gocui.Gui, *gocui.View) error) error {
	return gui.createPopupPanel(g, currentView, title, prompt, false, handleConfirm, handleClose)
}

func (gui *Gui) createPopupPanel(g *gocui.Gui, currentView *gocui.View, title, prompt string, hasLoader bool, handleConfirm, handleClose func(*gocui.Gui, *gocui.View) error) error {
	gui.onNewPopupPanel()
	g.Update(func(g *gocui.Gui) error {
		// delete the existing confirmation panel if it exists
		if view, _ := g.View("confirmation"); view != nil {
			if err := gui.closeConfirmationPrompt(); err != nil {
				gui.Log.Error(err.Error())
			}
		}
		confirmationView, err := gui.prepareConfirmationPanel(currentView, title, prompt, hasLoader)
		if err != nil {
			return err
		}
		confirmationView.Editable = false
		if err := gui.renderString(g, "confirmation", prompt); err != nil {
			return err
		}
		return gui.setKeyBindings(g, handleConfirm, handleClose)
	})
	return nil
}

func (gui *Gui) setKeyBindings(g *gocui.Gui, handleConfirm, handleClose func(*gocui.Gui, *gocui.View) error) error {
	// would use a loop here but because the function takes an interface{} and slices of interfaces require even more boilerplate
	if err := g.SetKeybinding("confirmation", nil, gocui.KeyEnter, gocui.ModNone, gui.wrappedConfirmationFunction(handleConfirm)); err != nil {
		return err
	}
	if err := g.SetKeybinding("confirmation", nil, 'y', gocui.ModNone, gui.wrappedConfirmationFunction(handleConfirm)); err != nil {
		return err
	}

	if err := g.SetKeybinding("confirmation", nil, gocui.KeyEsc, gocui.ModNone, gui.wrappedConfirmationFunction(handleClose)); err != nil {
		return err
	}
	if err := g.SetKeybinding("confirmation", nil, 'n', gocui.ModNone, gui.wrappedConfirmationFunction(handleClose)); err != nil {
		return err
	}

	return nil
}

// createSpecificErrorPanel allows you to create an error popup, specifying the
//  view to be focused when the user closes the popup, and a boolean specifying
// whether we will log the error. If the message may include a user password,
// this function is to be used over the more generic createErrorPanel, with
// willLog set to false
func (gui *Gui) createSpecificErrorPanel(message string, nextView *gocui.View, willLog bool) error {
	colorFunction := color.New(color.FgRed).SprintFunc()
	coloredMessage := colorFunction(strings.TrimSpace(message))
	return gui.createConfirmationPanel(gui.g, nextView, gui.Tr.ErrorTitle, coloredMessage, nil, nil)
}

func (gui *Gui) createErrorPanel(g *gocui.Gui, message string) error {
	return gui.createSpecificErrorPanel(message, g.CurrentView(), true)
}

func (gui *Gui) renderConfirmationOptions() error {
	optionsMap := map[string]string{
		"n/esc":   gui.Tr.No,
		"y/enter": gui.Tr.Yes,
	}
	return gui.renderOptionsMap(optionsMap)
}
