#!/usr/bin/env nu

def main [input: string, --resize(-r): string, --length(-l): string = "00:00:05"] {
    let resize = if ($resize | is-empty ) { "" } else { $resize }
    destroy (glitch $input $resize $length)
}

def glitch [input: string, resize: string, length: string] {
    let output = [ ($input | path parse | get stem ) "_glitch.mkv" ] | str join
    let filter = if ($resize | is-not-empty) {
        $"scale=($resize):-2,fps=60,frei0r=filter_name=glitch0r:filter_params=0.2|0.8|.04|1,rgbashift=rh=4:bh=-2,interlace=lowpass=complex"
    } else {
        "fps=60,frei0r=filter_name=glitch0r:filter_params=0.2|0.8|.04|1,rgbashift=rh=4:bh=-2,interlace=lowpass=complex"
    }
    #echo $"ffmpeg -loop 1 -i ($input) -filter_complex ($filter) -to ($length) ($output) -y"
    ffmpeg -loop 1 -i $input -filter_complex $filter -to $length $output -y
    echo $output
}

def destroy [input: string] {
    let output = ($input | path parse | get stem )
    let pngOutput = [ $output "_animated.png" ] | str join
    let mp4Output = [ ($input | path parse | get stem ) "_animated.mp4" ] | str join
    let mp4OutputFixed = [ ($mp4Output | path parse | get stem ) "_fixed.mp4" ] | str join
    echo $"Creating destroyed png image at: ($pngOutput)"
    magick -monitor $input $"APNG:($pngOutput)"
    echo $"Creating video at: ($mp4Output)"
    ffmpeg -i $pngOutput -vcodec libx265 -pix_fmt yuva420p $mp4Output -y
    echo $"Fixing video at: ($mp4OutputFixed)"
    ffmpeg -i $mp4Output $mp4OutputFixed -y
}