import json
import os
import re
import requests
from SCons.Script import *

_VERSIONS_URL = 'https://ftp.gnu.org/gnu/libunistring/?F=0'
_VERSION_PATTERN = re.compile(r'href="libunistring-([0-9]+)\.([0-9]+)\.([0-9]+)\.tar\.gz"')

def versions(env: Environment, update: bool = False):
    versions_file = os.path.join(env['DOWNLOAD_DIR'], 'libunistring_versions.json')
    if update or not os.path.exists(versions_file):
        req = requests.get(_VERSIONS_URL)
        result = []
        for match in _VERSION_PATTERN.finditer(req.text):
            result.append((int(match.groups()[0]), int(match.groups()[1]), int(match.groups()[2])))
        with open(versions_file, 'w') as f:
            json.dump(result, f)
        return result
    else:
        try:
            with open(versions_file, 'r') as f:
                return [tuple(v) for v in json.load(f)]
        except:
            print('libunistring_versions.json is empty or broken, redownloading.')
            return versions(env, update=True)

def dependencies(env: Environment, version) -> 'dict':
    return {}

def cook(env: Environment, version) -> dict:
    url = f'https://ftp.gnu.org/gnu/libunistring/libunistring-{version[0]}.{version[1]}.{version[2]}.tar.gz'
    repo = env.DownloadAndExtract(f'libunistring_{version[0]}.{version[1]}.{version[2]}', url = url, skip_folders = 1)
    checkout_root = repo['extracted_root']
    build_result = env.AutotoolsProject(checkout_root)
    return {
        'CPPPATH': build_result['CPPPATH'],
        'LIBS': [env.FindLib('unistring', paths=build_result['LIBPATH'])]
    }