import re
from SCons.Script import *

_REPO_NAME = 'libpng'
_REPO_URL = 'https://git.code.sf.net/p/libpng/code.git'
_TAG_PATTERN = re.compile(r'^v([0-9])+\.([0-9])+\.([0-9])$')

def available(env: Environment) -> bool:
    return hasattr(env, 'GitBranch') and hasattr(env, 'GitTags')

def versions(env: Environment, update: bool = False) -> 'list[str]':
    tags = env.GitTags(repo_name = _REPO_NAME, remote_url = _REPO_URL, force_fetch=update)
    result = []
    for tag in tags:
        match = _TAG_PATTERN.match(tag)
        if match:
            result.append((int(match.groups()[0]), int(match.groups()[1]), int(match.groups()[2])))
    return result

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

def cook(env: Environment, git_ref = 'master') -> dict:
    lib_z = env.Cook('zlib')
    repo = env.GitBranch(repo_name = 'libpng', remote_url = 'https://git.code.sf.net/p/libpng/code.git', git_ref = git_ref)
    checkout_root = repo['checkout_root']
    build_result = env.AutotoolsProject(checkout_root)
    return {
        'CPPPATH': build_result['CPPPATH'],
        'LIBS': [env.FindLib('png16', paths=build_result['LIBPATH'])],
        'DEPENDENCIES': [lib_z]
    }