// eslint-disable-next-line import/prefer-default-export

export function parseFfmpegProgressLine({ line, customMatcher, duration: durationIn }: {

line: string,

customMatcher?: ((a: string) => void) | undefined,

duration: number | undefined,

}) {

let match = line.match(/frame=\s*\S+\s+fps=\s*\S+\s+q=\s*\S+\s+(?:size|Lsize)=\s*\S+\s+time=\s*(\S+)\s+/);

if (!match) {

// Audio only looks like this: "size= 233422kB time=01:45:50.68 bitrate= 301.1kbits/s speed= 353x "

match = line.match(/(?:size|Lsize)=\s*\S+\s+time=\s*(\S+)\s+/);

}

if (!match) {

customMatcher?.(line);

return undefined;

}

if (durationIn == null) return undefined;

const duration = Math.max(0, durationIn);

if (duration === 0) return undefined;

const timeStr = match[1];

// console.log(timeStr);

const match2 = timeStr!.match(/^(-?)(\d+):(\d+):(\d+)\.(\d+)$/);

if (!match2) throw new Error(`Invalid time from ffmpeg progress ${timeStr}`);

const sign = match2[1];

if (sign === '-') {

// For some reason, ffmpeg sometimes gives a negative progress, e.g. "-00:00:06.46"

// let's just ignore those lines

return undefined;

}

const h = parseInt(match2[2]!, 10);

const m = parseInt(match2[3]!, 10);

const s = parseInt(match2[4]!, 10);

const cs = parseInt(match2[5]!, 10);

const time = (((h * 60) + m) * 60 + s) + cs / 100;

// console.log(time);

const progressTime = Math.max(0, time);

// console.log(progressTime);

const progress = Math.min(progressTime / duration, 1); // sometimes progressTime will be greater than cutDuration

return progress;

}