/*
    FFmpeg.js

    ArozOS FFMPEG FACTORY conversion backend
    This script is designed to do server side conversion only.
    For the client-side conversion function, see
    ffmpeg.wasm and the related files for more information.

    Required parameters
    INPUT (input filepath)
    OUTPUT (output filepath)
    COMPRESS (optional, output compression)
*/

requirelib("filelib");
requirelib("ffmpeg");

function main(){
    //Check if the input and output are valid
    if (typeof(INPUT) == "undefined" || typeof(OUTPUT) == "undefined"){
        //Invalid input or output
        sendJSONResp(JSON.stringify({
            "error":"invalid INTPUT or OUTPUT given"
        }));
        return;
    }

    //Check if input exists
    if (!filelib.fileExists(INPUT)){
        sendJSONResp(JSON.stringify({
            "error":"INTPUT file not exists"
        }));
        return;
    }

    var compressionRate = 0;
    if (typeof(COMP) != "undefined"){
        compressionRate = parseInt(COMP)
    }
    console.log("Using compression rate " + compressionRate);


    //Ok. Proceed with conversion
    var succ = ffmpeg.convert(INPUT, OUTPUT, compressionRate);
    if (succ){
        sendJSONResp(JSON.stringify("ok"));
    }else{
        sendJSONResp(JSON.stringify({
            "error":"ffmpeg reports a conversion error"
        }));
    }
    
}

//Run the main conversion logic
main();