#!/usr/bin/python

import sys, getopt

import time

from os.path import join as pjoin

import xml.etree.ElementTree as ET

from classes.Feature import *
from classes.Enum import *
from classes.Command import *
from classes.Extension import *
from classes.Type import *

from binding import *

from context import Context


def listApiMemberSets(features):
    apiMemberSetList = []
    for f in features:
        if f.api == "gl": # ToDo: probably seperate for all apis
            apiMemberSetList.append( (f, False, False) )
            if f.major > 3 or (f.major == 3 and f.minor >= 2):
                apiMemberSetList.append( (f, True, False) )
            apiMemberSetList.append( (f, False, True) )
    return apiMemberSetList

def generate(inputfile, patchfile, targetdir, revisionfile):

    # preparing

    print("")
    print("PREPARING")

    api     = "gl" # ToDo: other apis are untested yet

    print("checking revision")
    file = open(revisionfile, "r")
    revision = int(file.readline())
    file.close()
    print(" revision is " + str(revision))

    print("loading " + inputfile)
    tree       = ET.parse(inputfile)
    registry   = tree.getroot()

    # parsing

    print("")
    print("PARSING (" + api + " API)")

    print("parsing features")
    features   = parseFeatures(registry, api)
    print(" # " + str(len(features)) + " features parsed")

    print("parsing types")
    types      = parseTypes(registry, api)
    print(" # " + str(len(types)) + " types parsed")

    print("parsing extensions")
    extensions = parseExtensions(registry, features, api)
    print(" # " + str(len(extensions)) + " extensions parsed")

    print("parsing commands")
    commands   = parseCommands(registry, features, extensions, api)
    print(" # " + str(len(commands)) + " commands parsed")

    print("parsing enums")
    enums      = parseEnums(registry, features, extensions, commands, api)
    print(" # " + str(len(enums)) + " enums parsed")

    print("parsing enum groups")
    groups     = parseGroups(registry, enums)
    print(" # " + str(len(groups)) + " enum groups parsed")

    # patching

    print("")
    print("PATCHING")

    if patchfile is not None:

        print("parsing " + patchfile)
        patchtree     = ET.parse(patchfile)
        patchregistry = patchtree.getroot()

        print("patching types")
        patch = parseTypes(patchregistry, api)
        patchTypes(types, patch)

        print("patching commands")
        patch = parseCommands(patchregistry, features, extensions, api)
        patchCommands(commands, patch)

        print("patching features")
        print(" WARNING: todo")

        print("patching enums")
        patch = parseEnums(patchregistry, features, extensions, commands, api)
        patchEnums(enums, patch, groups)

        print("patching groups")
        patch = parseGroups(patchregistry, enums)
        patchGroups(groups, patch)

    # resolving references for classes

    enumsByName    = dict([(enum.name, enum) for enum in enums])
    groupsByName   = dict([(group.name, group) for group in groups])
    commandsByName = dict([(command.name, command) for command in commands])

    print("")
    print("RESOLVING")

    print("resolving features")
    resolveFeatures(features, enumsByName, commandsByName)

    print("resolving extensions")
    resolveExtensions(extensions, enumsByName, commandsByName, features, api)

    print("resolving groups")
    resolveGroups(groups, enumsByName)

    print("resolving enums")
    resolveEnums(enums, enumsByName, groupsByName)

    # verifying

    print("")
    print("VERIFYING")

    bitfGroups = [ g for g in groups
        if len(g.enums) > 0 and any(enum.type == "GLbitfield" for enum in g.enums) ]

    print("verifying groups")
    verifyGroups(groups, enums)

    print("verifying commands")
    verifyCommands(commands, bitfGroups)

    # generating

    print("")
    print("GENERATING")
    generateBegin = time.time()

    includedir = pjoin(targetdir, "include/glbinding/")
    includedir_api = pjoin(includedir, "{api}{memberSet}/")
    sourcedir  = pjoin(targetdir, "source/")
    sourcedir_api  = pjoin(sourcedir, "{api}/")
    testdir    = pjoin(targetdir, "../tests/glbinding-test/")

    context = Context(api, revision, features, extensions, enums, bitfGroups, types, commands)
    generalContext = context.general()

    # Generate files with common context
    Generator.generate(generalContext, pjoin(sourcedir, "glrevision.h"))
    Generator.generate(generalContext, pjoin(includedir_api, "extension.h"))
    # Generator.generate(generalContext, pjoin(includedir_api, "boolean.h"))
    Generator.generate(generalContext, pjoin(includedir_api, "values.h"))
    Generator.generate(generalContext, pjoin(includedir_api, "types.h"))
    Generator.generate(generalContext, pjoin(includedir_api, "bitfield.h"))
    Generator.generate(generalContext, pjoin(includedir_api, "enum.h"))
    Generator.generate(generalContext, pjoin(includedir_api, "functions.h"))
    Generator.generate(generalContext, pjoin(includedir_api, "gl.h"))

    Generator.generate(generalContext, pjoin(sourcedir_api, "types.cpp"))
    Generator.generate(generalContext, pjoin(testdir, "AllVersions_test.cpp"))
    Generator.generate(generalContext, pjoin(includedir, "Binding.h"))
    Generator.generate(generalContext, pjoin(sourcedir, "Binding_list.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir, "Version_ValidVersions.cpp"))

    Generator.generate(generalContext, pjoin(includedir, "Meta.h"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_Maps.h"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_getStringByBitfield.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_StringsByBitfield.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_BitfieldsByString.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_StringsByBoolean.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_BooleansByString.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_StringsByEnum.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_EnumsByString.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_StringsByExtension.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_ExtensionsByString.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_ReqVersionsByExtension.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_FunctionStringsByExtension.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_FunctionStringsByVersion.cpp"))
    Generator.generate(generalContext, pjoin(sourcedir,  "Meta_ExtensionsByFunctionString.cpp"))

    # Generate function-related files with specific contexts for each initial letter of the function name
    for functionGroup in generalContext["functionsByInitial"]["groups"]:
        specificContext = generalContext.copy()
        specificContext["currentFunctionGroup"] = functionGroup
        specificContext["currentFunctionInitial"] = functionGroup["name"].lower()

        Generator.generate(specificContext, pjoin(sourcedir_api, "functions_{currentFunctionInitial}.cpp"), "functions.cpp")
        Generator.generate(specificContext, pjoin(sourcedir, "Binding_objects_{currentFunctionInitial}.cpp"), "Binding_objects.cpp")

    # Generate files with ApiMemberSet-specific contexts
    for feature, core, ext in context.apiMemberSets():
        specificContext = context.apiMemberSetSpecific(feature, core, ext)

        Generator.generate(specificContext, pjoin(includedir_api, "boolean.h"), "booleanF.h")
        Generator.generate(specificContext, pjoin(includedir_api, "values.h"), "valuesF.h")
        Generator.generate(specificContext, pjoin(includedir_api, "types.h"), "typesF.h")
        Generator.generate(specificContext, pjoin(includedir_api, "bitfield.h"), "bitfieldF.h")
        Generator.generate(specificContext, pjoin(includedir_api, "enum.h"), "enumF.h")
        Generator.generate(specificContext, pjoin(includedir_api, "functions.h"), "functionsF.h")
        Generator.generate(specificContext, pjoin(includedir_api, "gl.h"), "glF.h")

    generateEnd = time.time()
    print("generation took {:.3f} seconds".format(generateEnd - generateBegin))


def main(argv):
    try:
        opts, args = getopt.getopt(argv[1:], "s:p:d:r:", ["spec=", "patch=", "directory=" , "revision="])
    except getopt.GetoptError:
        print("usage: %s -s <GL spec> [-p <patch spec file>] [-d <output directory>] [-r <revision file>]" % argv[0])
        sys.exit(1)

    targetdir = "."
    inputfile = None
    patchfile = None

    for opt, arg in opts:
        if opt in ("-s", "--spec"):
            inputfile = arg

        if opt in ("-p", "--patch"):
            patchfile = arg

        if opt in ("-d", "--directory"):
            targetdir = arg

        if opt in ("-r", "--revision"):
            revision  = arg

    if inputfile == None:
        print("no GL spec file given")
        sys.exit(1)

    Status.targetdir = targetdir

    generate(inputfile, patchfile, targetdir, revision)

if __name__ == "__main__":
    main(sys.argv)