import "pkg:/source/utils/misc.brs"
import "ViewCreator.brs"

sub init()
    m.queue = []
    m.originalQueue = []
    m.queueTypes = []
    m.position = 0
    m.shuffleEnabled = false
end sub

' Clear all content from play queue
sub clear()
    m.queue = []
    m.queueTypes = []
    setPosition(0)
end sub

' Delete item from play queue at passed index
sub deleteAtIndex(index)
    m.queue.Delete(index)
    m.queueTypes.Delete(index)
end sub

' Return the number of items in the play queue
function getCount()
    return m.queue.count()
end function

' Return the item currently in focus from the play queue
function getCurrentItem()
    return getItemByIndex(m.position)
end function

' Return whether or not shuffle is enabled
function getIsShuffled()
    return m.shuffleEnabled
end function

' Return the item in the passed index from the play queue
function getItemByIndex(index)
    return m.queue[index]
end function

' Returns current playback position within the queue
function getPosition()
    return m.position
end function

' Move queue position back one
sub moveBack()
    m.position--
end sub

' Move queue position ahead one
sub moveForward()
    m.position++
end sub

' Return the current play queue
function getQueue()
    return m.queue
end function

' Return the types of items in current play queue
function getQueueTypes()
    return m.queueTypes
end function

' Return the unique types of items in current play queue
function getQueueUniqueTypes()
    itemTypes = []

    for each item in getQueueTypes()
        if not inArray(itemTypes, item)
            itemTypes.push(item)
        end if
    end for

    return itemTypes
end function

' Return item at end of play queue without removing
function peek()
    return m.queue.peek()
end function

' Play items in queue
sub playQueue()
    nextItem = getCurrentItem()
    nextItemMediaType = getItemType(nextItem)

    if not isValid(nextItemMediaType) then return

    if nextItemMediaType = "audio"
        CreateAudioPlayerView()
    else if nextItemMediaType = "video"
        CreateVideoPlayerView()
    else if nextItemMediaType = "episode"
        CreateVideoPlayerView()
    end if
end sub

' Remove item at end of play queue
sub pop()
    m.queue.pop()
    m.queueTypes.pop()
end sub

' Push new items to the play queue
sub push(newItem)
    m.queue.push(newItem)
    m.queueTypes.push(getItemType(newItem))
end sub

' Set the queue position
sub setPosition(newPosition)
    m.position = newPosition
end sub

' Reset shuffle to off state
sub resetShuffle()
    m.shuffleEnabled = false
end sub

' Toggle shuffleEnabled state
sub toggleShuffle()
    m.shuffleEnabled = not m.shuffleEnabled

    if m.shuffleEnabled
        shuffleQueueItems()
        return
    end if

    resetQueueItemOrder()
end sub

' Reset queue items back to original, unshuffled order
sub resetQueueItemOrder()
    set(m.originalQueue)
end sub

' Return original, unshuffled queue
function getUnshuffledQueue()
    return m.originalQueue
end function

' Save a copy of the original queue and randomize order of queue items
sub shuffleQueueItems()
    ' By calling getQueue 2 different ways, Roku avoids needing to do a deep copy
    m.originalQueue = m.global.queueManager.callFunc("getQueue")
    songIDArray = getQueue()

    ' Move the currently playing song to the front of the queue
    temp = top()
    songIDArray[0] = getCurrentItem()
    songIDArray[getPosition()] = temp

    for i = 1 to songIDArray.count() - 1
        j = Rnd(songIDArray.count() - 1)
        temp = songIDArray[i]
        songIDArray[i] = songIDArray[j]
        songIDArray[j] = temp
    end for

    set(songIDArray)
end sub

' Return the fitst item in the play queue
function top()
    return getItemByIndex(0)
end function

' Replace play queue with passed array
sub set(items)
    clear()
    m.queue = items
    for each item in items
        m.queueTypes.push(getItemType(item))
    end for
end sub

function getItemType(item) as string
    if isValid(item) and isValid(item.json) and isValid(item.json.mediatype) and item.json.mediatype <> ""
        return LCase(item.json.mediatype)
    else if isValid(item) and isValid(item.type) and item.type <> ""
        return LCase(item.type)
    end if

    return invalid
end function