import os
from bs4 import BeautifulSoup
import urllib.request

# Base link to the lessons page
edunovaLink = "https://davy04.edunova.it/presentation/"
# Relative path to the slides video
videoSuffix = "/deskshare/deskshare.webm"
# Relative path to the presentation audio
audioSuffix = "/video/webcams.mp4"
# slides = "https://davy04.edunova.it/presentation/17d59e4eb742c498e605406fd441c1a2d7eb4bf0-1601024050226/shapes.svg"

# Dictionary containing the id of the saved lessons
meetingsID = {
    '2020-10-02': '17d59e4eb742c498e605406fd441c1a2d7eb4bf0-1601628738707',
    '2020-09-29': '17d59e4eb742c498e605406fd441c1a2d7eb4bf0-1601380547311',
    '2020-09-25': '17d59e4eb742c498e605406fd441c1a2d7eb4bf0-1601024050226',
    '2020-10-06': '17d59e4eb742c498e605406fd441c1a2d7eb4bf0-1601984780753',
    '2020-10-09': '17d59e4eb742c498e605406fd441c1a2d7eb4bf0-1602232967548',
    '2020-10-13': '17d59e4eb742c498e605406fd441c1a2d7eb4bf0-1602590201390'
}

if __name__ == "__main__":
    os.makedirs("VideoLezioni", exist_ok=True)
    os.chdir("VideoLezioni")

    for (date, meetId) in meetingsID.items():
        if os.path.exists(f"Gestione{date}joinedWithSlide.mp4"):
            print("Il video e' gia' stato scaricato")
            continue

        # Assemblo il comando ffmpeg con i riferimenti web a video e audio della presentazione con id {meetId}
        downloadAndJoin = f"ffmpeg -i {edunovaLink}{meetId}{videoSuffix} -i {edunovaLink}{meetId}{audioSuffix} -map 0:v -map 1:a -c:v copy -shortest Gestione{date}joined.mp4"
        os.system(downloadAndJoin)
        svgSlide = urllib.request.urlopen(f"{edunovaLink}{meetId}/shapes.svg").read()

        soup = BeautifulSoup(svgSlide, 'html.parser')
        usefulImg = []
        for img in soup.find_all('image'):

            start = img.get('in')
            end = img.get('out')
            imgLink = img.get('xlink:href')
            if not imgLink.endswith("deskshare.png"):
                usefulImg.append([float(start), float(end), imgLink])

        imgSorted = sorted(usefulImg)
        print(imgSorted)
        if len(imgSorted) == 0:
            os.rename(f"Gestione{date}joined.mp4", f"Gestione{date}joinedWithSlide.mp4")
            continue

        slideBase = f"{edunovaLink}{meetId}/"

        imgLinkList = ''
        imgScaleList = ''
        for l in imgSorted:
            imgLinkList += f"-i \"{slideBase}{l[2]}\" "

        for i in range(len(imgSorted)):
            imgScaleList += f"[{i + 1}:v] scale=1280:720 [ol{i}]; "

        imgOverlayList = f"[0:v] [ol0] overlay=0:0:enable='between(t,{int(imgSorted[0][0])},{int(imgSorted[0][1])})' [olo0]; "

        for i in range(1, len(imgSorted) - 1):
            imgOverlayList += f"[olo{i - 1}] [ol{i}] overlay=0:0:enable='between(t,{int(imgSorted[i][0])},{int(imgSorted[i][1])})' [olo{i}]; "

        imgOverlayList += f"[olo{len(imgSorted) - 1 - 1}] [ol{len(imgSorted) - 1}] overlay=0:0:enable='between(t,{int(imgSorted[len(imgSorted) - 1][0])},{int(imgSorted[len(imgSorted) - 1][1])})'"

        # Informazioni di debug sulle immagini e sui momenti nei quali inserirle nel video
        print(imgLinkList)
        print(imgScaleList)
        print(imgOverlayList)

        # Comando di esempio di utilizzo di ffmpeg per incollare diverse immagini in diversi momenti su un video
        # ffmpeg -i Untitled.mp4 -i slide-1.png -i slide-2.png -filter_complex "[1:v] scale=640:480 [ol]; [2:v] scale=640:480 [ol2]; [0:v] [ol] overlay=0:0:enable='between(t,0,20)' [ol1]; [ol1] [ol2] overlay=0:0:enable='between(t, 30,40)'" -codec:a copy example_marked.mp4

        ffmpegCommand = f'ffmpeg -i Gestione{date}joined.mp4 {imgLinkList} -filter_complex "{imgScaleList}{imgOverlayList}" -codec:a copy Gestione{date}joinedWithSlide.mp4'

        os.system(ffmpegCommand)
        # Rimuovo il file intermedio senza slide
        os.remove(f"Gestione{date}joined.mp4")