# Downloads dill files from CIPD for each supported ABI version.

import os
import subprocess
import sys
import utils


def procWait(p):
    while p.returncode is None:
        p.communicate()
        p.poll()
    return p.returncode


def findAbiVersion(version):
    cmd = ['cipd', 'instances', 'dart/abiversions/%d' % version]
    p = subprocess.Popen(
        cmd,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        shell=utils.IsWindows(),
        cwd=utils.DART_DIR)
    return procWait(p) == 0


def main():
    abi_version = int(utils.GetAbiVersion())
    oldest_abi_version = int(utils.GetOldestSupportedAbiVersion())
    cmd = ['cipd', 'ensure', '-root', 'tools/abiversions', '-ensure-file', '-']
    ensure_file = ''
    for i in range(oldest_abi_version, abi_version + 1):
        if findAbiVersion(i):
            ensure_file += '@Subdir %d\ndart/abiversions/%d latest\n\n' % (i, i)
    if not ensure_file:
        return 0
    p = subprocess.Popen(
        cmd,
        stdin=subprocess.PIPE,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
        shell=utils.IsWindows(),
        cwd=utils.DART_DIR)
    p.communicate(ensure_file)
    p.stdin.close()
    return procWait(p)


if __name__ == '__main__':
    sys.exit(main())