package main

import (
	"fmt"
	"strings"

	"github.com/gdamore/tcell"
	"gitlab.com/tslocum/cbind"
)

const (
	actionSelect        = "select"
	actionPause         = "pause"
	actionRefresh       = "refresh"
	actionToggleHidden  = "hidden-folders"
	actionBrowseParent  = "browse-parent"
	actionVolumeMute    = "volume-mute"
	actionVolumeDown    = "volume-down"
	actionVolumeUp      = "volume-up"
	actionPreviousItem  = "previous-item"
	actionNextItem      = "next-item"
	actionPreviousPage  = "previous-page"
	actionNextPage      = "next-page"
	actionPreviousTrack = "previous-track"
	actionNextTrack     = "next-track"
	actionExit          = "exit"
)

var actionHandlers = map[string]func(){
	actionSelect:        listSelect,
	actionPause:         pause,
	actionRefresh:       listRefresh,
	actionToggleHidden:  listToggleHidden,
	actionBrowseParent:  browseParent,
	actionVolumeMute:    toggleMute,
	actionVolumeDown:    decreaseVolume,
	actionVolumeUp:      increaseVolume,
	actionPreviousItem:  listPrevious,
	actionNextItem:      listNext,
	actionPreviousPage:  listPreviousPage,
	actionNextPage:      listNextPage,
	actionPreviousTrack: skipPrevious,
	actionNextTrack:     skipNext,
	actionExit:          exit,
}

var inputConfig = cbind.NewConfiguration()

func wrapEventHandler(f func()) func(_ *tcell.EventKey) *tcell.EventKey {
	return func(_ *tcell.EventKey) *tcell.EventKey {
		f()
		return nil
	}
}

func setKeyBinds() error {
	if len(config.Input) == 0 {
		setDefaultKeyBinds()
	}

	for a, keys := range config.Input {
		a = strings.ToLower(a)
		handler := actionHandlers[a]
		if handler == nil {
			return fmt.Errorf("failed to set keybind for %s: unknown action", a)
		}

		for _, k := range keys {
			mod, key, ch, err := cbind.Decode(k)
			if err != nil {
				return fmt.Errorf("failed to set keybind %s for %s: %s", k, a, err)
			}

			if key == tcell.KeyRune {
				inputConfig.SetRune(mod, ch, wrapEventHandler(handler))
			} else {
				inputConfig.SetKey(mod, key, wrapEventHandler(handler))
			}
		}
	}

	return nil
}

func setDefaultKeyBinds() {
	config.Input = map[string][]string{
		actionSelect:        {"Enter"},
		actionPause:         {"Space"},
		actionRefresh:       {"r"},
		actionToggleHidden:  {"."},
		actionBrowseParent:  {"Backspace"},
		actionVolumeMute:    {"m"},
		actionVolumeDown:    {"-"},
		actionVolumeUp:      {"+"},
		actionPreviousItem:  {"Up", "k"},
		actionNextItem:      {"Down", "j"},
		actionPreviousPage:  {"PageUp"},
		actionNextPage:      {"PageDown"},
		actionPreviousTrack: {"p"},
		actionNextTrack:     {"n"},
		actionExit:          {"Escape"},
	}
}