from urllib.parse import urljoin

class Package(object):

	'''Abstract base class for packages.

	'''

	niceName = None

	sourceName = None

	@classmethod

	def getMakeName(cls):

		return cls.sourceName.upper().replace('-', '_')

class DownloadablePackage(Package):

	'''Abstract base class for packages that can be downloaded.

	'''

	downloadURL = None

	version = None

	fileLength = None

	checksums = None

	@classmethod

	def getSourceDirName(cls):

		'''Returns the desired name of the top-level source directory.

		This might not match the actual name inside the downloaded archive,

		but we can perform a rename on extraction to fix that.

		'''

		return '%s-%s' % (cls.sourceName, cls.version)

	@classmethod

	def getTarballName(cls):

		return '%s-%s.tar.gz' % (cls.sourceName, cls.version)

	@classmethod

	def getURL(cls):

		return urljoin(cls.downloadURL + '/', cls.getTarballName())

class ALSA(Package):

	niceName = 'ALSA'

	sourceName = 'alsa-lib'

	@classmethod

	def getMakeName(cls):

		return 'ALSA'

class FreeType(DownloadablePackage):

	downloadURL = 'http://downloads.sourceforge.net/freetype'

	niceName = 'FreeType'

	sourceName = 'freetype'

	version = '2.13.3'

	fileLength = 4063324

	checksums = {

		'sha256':

			'5c3a8e78f7b24c20b25b54ee575d6daa40007a5f4eea2845861c3409b3021747',

		}

class GLEW(DownloadablePackage):

	downloadURL = 'http://downloads.sourceforge.net/glew'

	niceName = 'GLEW'

	sourceName = 'glew'

	version = '2.2.0'

	fileLength = 835861

	checksums = {

		'sha256':

			'd4fc82893cfb00109578d0a1a2337fb8ca335b3ceccf97b97e5cc7f08e4353e1',

		}

	@classmethod

	def getTarballName(cls):

		return '%s-%s.tgz' % (cls.sourceName, cls.version)

class LibPNG(DownloadablePackage):

	downloadURL = 'http://downloads.sourceforge.net/libpng'

	niceName = 'libpng'

	sourceName = 'libpng'

	version = '1.6.44'

	fileLength = 1545850

	checksums = {

		'sha256':

			'8c25a7792099a0089fa1cc76c94260d0bb3f1ec52b93671b572f8bb61577b732',

		}

	@classmethod

	def getMakeName(cls):

		return 'PNG'

class OGG(DownloadablePackage):

	downloadURL = 'http://downloads.xiph.org/releases/ogg'

	niceName = 'libogg'

	sourceName = 'libogg'

	version = '1.3.5'

	fileLength = 593071

	checksums = {

		'sha256':

			'0eb4b4b9420a0f51db142ba3f9c64b333f826532dc0f48c6410ae51f4799b664',

		}

	@classmethod

	def getMakeName(cls):

		return 'OGG'

class OpenGL(Package):

	niceName = 'OpenGL'

	sourceName = 'gl'

class PkgConfig(DownloadablePackage):

	downloadURL = 'https://pkg-config.freedesktop.org/releases'

	niceName = 'pkg-config'

	sourceName = 'pkg-config'

	version = '0.29.2'

	fileLength = 2016830

	checksums = {

		'sha256':

			'6fc69c01688c9458a57eb9a1664c9aba372ccda420a02bf4429fe610e7e7d591',

		}

class SDL2(DownloadablePackage):

	downloadURL = 'https://www.libsdl.org/release'

	niceName = 'SDL2'

	sourceName = 'SDL2'

	version = '2.32.10'

	fileLength = 7630262

	checksums = {

		'sha256':

			'5f5993c530f084535c65a6879e9b26ad441169b3e25d789d83287040a9ca5165',

		}

class SDL2_ttf(DownloadablePackage):

	downloadURL = 'http://www.libsdl.org/projects/SDL_ttf/release'

	niceName = 'SDL2_ttf'

	sourceName = 'SDL2_ttf'

	version = '2.22.0'

	fileLength = 14314901

	checksums = {

		'sha256':

			'd48cbd1ce475b9e178206bf3b72d56b66d84d44f64ac05803328396234d67723',

		}

class TCL(DownloadablePackage):

	downloadURL = 'http://downloads.sourceforge.net/tcl'

	niceName = 'Tcl'

	sourceName = 'tcl'

	version = '8.6.15'

	fileLength = 11765231

	checksums = {

		'sha256':

			'861e159753f2e2fbd6ec1484103715b0be56be3357522b858d3cbb5f893ffef1',

		}

	@classmethod

	def getSourceDirName(cls):

		return '%s%s' % (cls.sourceName, cls.version)

	@classmethod

	def getTarballName(cls):

		return '%s%s-src.tar.gz' % (cls.sourceName, cls.version)

class Theora(DownloadablePackage):

	downloadURL = 'http://downloads.xiph.org/releases/theora'

	niceName = 'libtheora'

	sourceName = 'libtheora'

	version = '1.1.1'

	fileLength = 2111877

	checksums = {

		'sha256':

			'40952956c47811928d1e7922cda3bc1f427eb75680c3c37249c91e949054916b',

		}

	@classmethod

	def getMakeName(cls):

		return 'THEORA'

class Vorbis(DownloadablePackage):

	downloadURL = 'http://downloads.xiph.org/releases/vorbis'

	niceName = 'libvorbis'

	sourceName = 'libvorbis'

	version = '1.3.7'

	fileLength = 1658963

	checksums = {

		'sha256':

			'0e982409a9c3fc82ee06e08205b1355e5c6aa4c36bca58146ef399621b0ce5ab',

		}

	@classmethod

	def getMakeName(cls):

		return 'VORBIS'

class ZLib(DownloadablePackage):

	downloadURL = 'https://zlib.net/fossils/'

	niceName = 'zlib'

	sourceName = 'zlib'

	version = '1.3.1'

	fileLength = 1512791

	checksums = {

		'sha256':

			'9a93b2b7dfdac77ceba5a558a580e74667dd6fede4585b91eefb60f03b72df23',

		}

# Build a dictionary of packages using introspection.

_packagesByName = {

	obj.getMakeName(): obj

	for obj in locals().values()

	if isinstance(obj, type)

		and issubclass(obj, Package)

		and obj is not Package

		and obj is not DownloadablePackage

	}

def getPackage(makeName):

	return _packagesByName[makeName]

def iterDownloadablePackages():

	for package in _packagesByName.values():

		if issubclass(package, DownloadablePackage):

			yield package