package main

import (
	"path"
	"time"
)

func listPrevious() {
	if mainBufferOrigin > 0 && mainBufferCursor == mainBufferOrigin {
		mainBufferOrigin--
	}
	if mainBufferCursor > 0 {
		mainBufferCursor--
	}

	go app.QueueUpdateDraw(updateMain)
}

func listNext() {
	if mainBufferCursor < len(mainBufferFiles) {
		mainBufferCursor++
		if mainBufferCursor-mainBufferOrigin > mainBufHeight-3 {
			mainBufferOrigin++
		}
	}

	go app.QueueUpdateDraw(updateMain)
}

func listSelect() {
	if mainBufferCursor == 0 {
		browseFolder(path.Join(mainBufferDirectory, ".."))
		return
	}

	entry := selectedEntry()
	if entry.File.IsDir() {
		browseFolder(path.Join(mainBufferDirectory, path.Base(entry.File.Name())))
		return
	}

	audioFile, err := openFile(path.Join(mainBufferDirectory, entry.File.Name()), entry.Metadata)
	if err != nil {
		statusText = err.Error()
		go func() {
			time.Sleep(5 * time.Second)
			statusText = ""
			go app.QueueUpdateDraw(updateMain)
		}()
		go app.QueueUpdateDraw(updateMain)
		return
	}
	go play(audioFile)

	go app.QueueUpdateDraw(updateStatus)
}

func selectedEntry() *libraryEntry {
	return mainBufferFiles[mainBufferCursor-1]
}

func offsetEntry(offset int) *libraryEntry {
	return mainBufferFiles[(mainBufferCursor-1)+offset]
}

func listPreviousPage() {
	if mainBufferOrigin == 0 {
		mainBufferCursor = 0

		go app.QueueUpdateDraw(updateMain)
		return
	}

	mainBufferOrigin -= (mainBufHeight - 1) - 2
	if mainBufferOrigin < 0 {
		mainBufferOrigin = 0
	}
	mainBufferCursor = mainBufferOrigin

	go app.QueueUpdateDraw(updateMain)
}

func listNextPage() {
	numEntries := len(mainBufferFiles)

	if mainBufferOrigin >= numEntries-(mainBufHeight-1) {
		mainBufferCursor = numEntries

		go app.QueueUpdateDraw(updateMain)
		return
	}

	mainBufferOrigin += (mainBufHeight - 1) - 2
	if mainBufferOrigin > (numEntries-(mainBufHeight-1))+2 {
		mainBufferOrigin = (numEntries - (mainBufHeight - 1)) + 2
	}
	mainBufferCursor = mainBufferOrigin

	go app.QueueUpdateDraw(updateMain)
}

func listRefresh() {
	// TODO Remember cursor position
	d := mainBufferDirectory
	mainBufferDirectory = ""
	browseFolder(d)
}

func listToggleHidden() {
	showHiddenFolders = !showHiddenFolders

	if showHiddenFolders {
		statusText = "Hidden folders: show"
	} else {
		statusText = "Hidden folders: hide"
	}
	go func() {
		time.Sleep(3 * time.Second)
		statusText = ""
		go app.QueueUpdateDraw(updateMain)
	}()

	listRefresh()
}