# Windows path: os.getenv('LOCALAPPDATA')/Programs/PrismLauncher/prismlauncher.exe
# Windows instance path: os.getenv('APPDATA')/PrismLauncher/instances
# Linux instance path: .local/share/PrismLauncher/instances
from ftplib import FTP_TLS as FTP
import os
import io
import json
import tempfile
import subprocess
import time

def main():
    instance_name = "Familycraft Season 7"
    prism_command = "prismlauncher"
    prism_instance_path = os.getenv("HOME")+"/.local/share/PrismLauncher/instances"
    if os.name == 'nt':
        prism_command = os.getenv('LOCALAPPDATA')+"/Programs/PrismLauncher/prismlauncher.exe"
        prism_instance_path = os.getenv("APPDATA")+"/PrismLauncher/instances"
    ftp = FTP("gitea.piwalker.net")
    ftp.login()
    ftp.prot_p()
    bio = io.BytesIO()
    ftp.retrbinary("RETR versions.json", bio.write)
    bio.seek(0)
    versions = json.load(bio)
    bio.close()
    version = "0.0.0" 
    if os.path.exists(prism_instance_path+"/"+instance_name+"/.minecraft/version.txt"):
        with open(prism_instance_path+"/"+instance_name+"/.minecraft/version.txt", 'r') as fp:
            version = fp.readline().rstrip()
    if version != versions[len(versions)-1]["Version"]:
        #version = versions[len(versions)-1]["Version"]
        # Update Modpack
        print(version)
        print(versions[len(versions)-1]["Version"])
        with tempfile.TemporaryDirectory() as temp_dir:
            modpack = open(os.path.join(temp_dir, instance_name+".mrpack"), 'wb')
            ftp.retrbinary("RETR "+versions[len(versions)-1]["File"], modpack.write)
            modpack.close()
            p = subprocess.Popen([prism_command, '-I', modpack.name])
            while True:
                time.sleep(5)
                if os.path.exists(prism_instance_path+"/"+instance_name+"/.minecraft/version.txt"):
                    with open(prism_instance_path+"/"+instance_name+"/.minecraft/version.txt", 'r') as fp:
                        version = fp.readline().rstrip()
                if version == versions[len(versions)-1]["Version"]:
                    break;

        #with open(prism_instance_path+"/"+instance_name+"/version.txt", 'w') as fp:
        #    fp.seek(0)
        #    fp.truncate()
        #    fp.write(version)
    subprocess.run([prism_command, '-l', instance_name])
            

        


        
    

if __name__ == "__main__":
    main();