#! /usr/bin/env python

import requests, platform, re, collections, tempfile, os, sys, shutil, math
from subprocess import call

version_re = "seafile-server-?_?([\d\.]*)"

seaf_home = os.environ["SEAF"] or "/opt/seafile"

def available(page):
   (arch, _) = platform.architecture()
   if arch == "64bit":
      arch = "x86-64"
   else: arch = "i386"
   link = "http(s?):\/\/[^ \"\(\)\<\>]*%s_?%s.tar.gz" % (version_re ,arch)
   resp = requests.get(page)
   available = {}
   for m in re.finditer(link, resp.text):
      available[m.group(2)] = m.group(0) #{version: link}
   return collections.OrderedDict(sorted(available.items(), reverse=True))

def version_int(version):
   parts=version.split('.')
   rank=len(parts)
   from math import pow
   no=0
   for p in parts:
     rank=rank-1
     no=no+int(p)*pow(10,rank)
   return no 

def list_command(page="https://www.seafile.com/en/download/"):
   for (version, link) in available(page).items():
      print("- %s: %s" % (version, link))
   return 0

def current_version_command():
    print(current_version())

def installed_versions():
    installed = []
    for f in os.listdir(seaf_home):
       m = re.findall(version_re,f)
       if len(m) > 0:
          installed.append(m[0])
    return installed

def current_version():
    current = os.path.realpath(os.path.join(seaf_home, "seafile-server-latest"))
    res = re.findall(version_re,current)
    if len(res[0]) == 0: return '0'
    return '.'.join(res)

def perform_upgrade_command(version,mysql=False,yes=True):
   scripts = os.path.join(seaf_home,"seafile-server-%s" % version, "upgrade")
   current = map(lambda x: int(x), current_version().split("."))
   target = map(lambda x: int(x), version.split("."))
   if len(current) == 1 and current[0] == 0: #Not installed
      #print("Running installer.")
      #if not call(["seafile-server","setup", os.path.join(seaf_home,"seafile-server-%s" % version) ],stdout=sys.stdout, stdin=sys.stdin):
      #  sys.exit(1)
      crumb = open(seaf_home + "/ahead", 'w')
      crumb.write(os.path.join(seaf_home,"seafile-server-%s" % version))
      crumb.close()
      sys.exit(126)
   script_re = "^upgrade_(\d+).(\d+)_(\d+).(\d+)\.sh$"
   run = []
   last = None
   for s in os.listdir(scripts):
      m = re.match(script_re, s)
      if m:
         comp = map(lambda x: int(x), m.groups())
         last = (s, comp)
         (major, minor, minorsub, rev) = comp
         if current[0] <= major and minor > current[1]:
             run.append(s)
   for script in run:
      cmd = []
      if yes: cmd.append("echo -ne '\n'")
      cmd.append(script)
      call(["/bin/sh", "-c", ''.join(cmd)], stdout=sys.stdout, stdin=(None if yes else sys.stdin))

def download(url, version):
   tmp = tempfile.mkdtemp()
   filename = "server_%s.tar.gz" % version
   pks = os.path.join(seaf_home, "pkg")
   if not os.path.exists(pks):
      os.mkdir(pks)
   dest = os.path.join(pks, filename)
   if os.path.exists(dest):
      return dest
   if call(["/bin/sh", "-c", 'curl %s --output %s/%s' % (url, tmp, filename)]) == 0:     
      shutil.move(os.path.join(tmp,filename), dest)
      call(["/bin/chmod", "-w", dest])
      return dest
   else:
      print("Download failed")
      sys.exit(1)
      return 0

def install_command(url, version):
   pkg = download(url, version)
   tmp = tempfile.mkdtemp()
   if pkg and call(["/bin/sh", "-c", 'cd %s; tar xzvf %s' % (tmp, pkg)]) == 0:
      for f in os.listdir(tmp):
         dest = os.path.join(seaf_home, os.path.basename(f))
         if len(re.findall(version_re, f)) > 0:
             if not os.path.exists(dest):           
                shutil.move(os.path.join(tmp,f), dest)
             else:
                shutil.rmtree(tmp)
                print("Found previous installation, resuming setup")
             current = current_version()
             target_version = ''.join(re.findall(version_re,dest))
             if len(current) == 1: current = current[0] 
             else: current = "0.0.0"
             print("Upgrading from: %s -> %s" % (current, target_version))
             perform_upgrade_command(target_version,mysql=("SEAF_MYSQL" in os.environ and os.environ["SEAF_MYSQL"]))
      if os.path.exists(tmp) and len(os.listdir(tmp)) != 0:
         print("Failed to unpack update")
         os.rmdir(tmp)
         return 1
      os.rmdir(tmp)
   return 0

#TODO: figure out how to rename main to "" 
def main_command(version="latest",page="https://www.seafile.com/en/download/"):
   avail = available(page)
   install = None
   if version == "latest":
      (version,install) = avail.items()[0]
   else:
      if version in dict(avail.items()):
         install = dict(avail.items())[version]
   if version_int(current_version()) == version_int(version):
      print("%s(%s) is already installed" % (version,version_int(version)))
      sys.exit(126)
   if version in installed_versions():
      return perform_upgrade_command(version)
   if install:
      print("Installing: %s" % version)
      sys.exit(install_command(install, version))
   else:
      print("Couldn't determine download for %s" % version)
      sys.exit(1)

if __name__ == '__main__':
   import scriptine
   scriptine.run()