from collections.abc import Callable

from solo_tool.solo_tool import SoloTool

def playPause(st: SoloTool) -> Callable[[], None]:
    def f():
        if st.playing:
            st.pause()
        else:
            st.play()
    return f

def songRelative(st: SoloTool, delta: int) -> Callable[[], None]:
    def f():
        if st.song is None:
            st.song = 0
        else:
            st.song += delta
    return f

def restartOrPreviousSong(st: SoloTool, threshold: float) -> Callable[[], None]:
    def f():
        if st.position < threshold and st.song > 0:
            st.song -= 1
        else:
            st.position = 0.0
    return f

def songAbsolute(st: SoloTool, index: int, followUp: Callable[[], None]=None) -> Callable[[], None]:
    def f():
        st.song = index
        if followUp is not None:
            followUp()
    return f

def seekRelative(st: SoloTool, delta: float) -> Callable[[], None]:
    def f():
        st.position += delta
    return f

def seekAbsolute(st: SoloTool, delta: float) -> Callable[[], None]:
    def f():
        st.position = delta
    return f

def positionToKeyPoint(st: SoloTool) -> Callable[[], None]:
    def f():
        st.keyPoint = st.position
    return f

def keyPointAbsolute(st: SoloTool, kp: float) -> Callable[[], None]:
    def f():
        st.keyPoint = kp
    return f

def keyPointRelative(st: SoloTool, delta: int) -> Callable[[], None]:
    from bisect import bisect_right, bisect_left
    def f():
        l = sorted(set(st.keyPoints + [st.keyPoint]))
        if delta > 0:
            pivot = bisect_right(l, st.keyPoint) - 1
        elif delta < 0:
            pivot = bisect_left(l, st.keyPoint)
        else:
            return
        new = max(min(pivot + delta, len(l) - 1), 0)
        st.keyPoint = l[new]
    return f

def rateAbsolute(st: SoloTool, value: float) -> Callable[[], None]:
    def f():
        st.rate = value
    return f

def rateRelative(st: SoloTool, delta: float) -> Callable[[], None]:
    def f():
        st.rate += delta
    return f

def volumeAbsolute(st: SoloTool, value: float) -> Callable[[], None]:
    def f():
        st.volume = value
    return f