import argparse
import os

#from shell import Shell
from sccd.compiler.generic_generator import GenericGenerator, Platforms
from sccd.compiler.utils import Enum, Logger, FileWriter
from sccd.compiler.generic_language_constructs import GenericConstruct
from sccd.compiler.compiler_exceptions import CompilerException
from sccd.compiler.javascript_writer import JavascriptWriter
from sccd.compiler.python_writer import PythonWriter
from sccd.compiler.super_class_linker import SuperClassLinker
from sccd.compiler.state_linker import StateLinker
from sccd.compiler.path_calculator import PathCalculator
from sccd.compiler.sccd_constructs import ClassDiagram

from sccd_asg_mapper import SCCD_ASG_Mapper
pathname = os.path.dirname(os.path.realpath(__file__))

from sccd_to_xml_JS import XML2JavaScriptRules
from sccd_to_xml_PY import XML2PythonRules

from mvk_loader import MvKLoader
from sccd_to_xml import SCCD_to_XML

def generate(input_file, output_file, target_language, platform):
    sccd = xmlToSccd(input_file)

    if not target_language:
        if sccd.language:
            target_language = sccd.language
        else:
            target_language = "python" # default
    elif sccd.language and target_language != sccd.language:
        Logger.showError("Diagram specifies target language as \"" + sccd.language + "\", but language option of compiler has been set to \"" + target_language + "\". No output has been generated.")
        return

    if target_language == "python" and not output_file.endswith(".py") :
        output_file += ".py"
    elif target_language == "javascript" and not output_file.endswith(".js") :
        output_file += ".js"

    generic = sccdToGeneric(sccd, platform)
    genericToTarget(generic, target_language, output_file)

def xmlToSccd(xml_file):
    cd = ClassDiagram(xml_file) # create AST
    cd.accept(SuperClassLinker())
    #SuperClassLinker().visit(cd) # visitor linking super classs references
    StateLinker().visit(cd) # visitor fixing state references
    PathCalculator().visit(cd) # visitor calculating paths
    return cd
    
def sccdToGeneric(sccd, platform):
    succesfull_generation = False
    generator = GenericGenerator(platform)
    sccd.accept(generator)
    generic = generator.get()
    Logger.showInfo("Classes <" + ", ".join(sccd.class_names) + "> have been converted to generic language constructs.")
    return generic

def genericToTarget(generic, target_language, output_file):
    try:
        f = FileWriter(output_file)
        if target_language == "javascript":
            writer = JavascriptWriter(f)
        elif target_language == "python":
            writer = PythonWriter(f)
        else:
            raise Exception("Language not supported")
        generic.accept(writer)
        Logger.showInfo("Generic language constructs have been converted to target language constructs and have been written to file '" + output_file + "'.")
    finally:
        f.close()
def main():
    mapper = SCCD_ASG_Mapper()

    parser = argparse.ArgumentParser()
    parser.add_argument('input', help='The path to the XML file to be compiled.')
    parser.add_argument('-o', '--output', type=str, help='The path to the generated code. Defaults to the same name as the input file but with matching extension.')
    parser.add_argument('-v', '--verbose', type=int, help='2 = all output; 1 = only warnings and errors; 0 = only errors; -1 = no output.  Defaults to 2.', default = 2)
    parser.add_argument('-p', '--platform', type=str, help="Let the compiled code run on top of threads, gameloop or eventloop. The default is eventloop.")
    parser.add_argument('-l', '--language', type=str, help='Target language, either "javascript" or "python". Defaults to the latter.')
    #parser.add_argument('-m', '--mvklocation', type=str, help='Location in the Modelverse. After compilation the modelverse shell is opened.')
    parser.add_argument('-justxml', dest='justxml', action='store_true')
    parser.set_defaults(justxml=False)


    args = vars(parser.parse_args())
    
    #Set verbose
    if args['verbose'] is not None:
        if args['verbose'] in [-1, 0,1,2] :
            Logger.verbose = args['verbose']
        else :
            Logger.showError("Invalid verbose argument.")
    else :
        Logger.verbose = 2

    #Set source file
    source = args['input'].lower()
    if not source.endswith(".sccd") :
        Logger.showError("Input file not valid.")
        return

    #Set target language
    if args['language'] :
        target_language = args['language']
    else :
        target_language = ""

    #Set output file
    if args['output'] :
        output = args['output']
    else:
        output = os.path.splitext(os.path.split(source)[1])[0]
        
    #Set platform    
    if args['platform'] :
        args['platform'] = args['platform'].lower()
        if args['platform'] == "threads" :
            platform = Platforms.Threads
        elif args['platform'] == "gameloop" :
            platform = Platforms.GameLoop
        elif args['platform'] == "eventloop" :
            platform = Platforms.EventLoop
        else :
            Logger.showError("Invalid platform.")
            return          
    else :
        platform = Platforms.Threads

    mvklocation = 'unused_location'
    """
    if args['mvklocation'] :
        mvklocation = args['mvklocation']
        modelverseshell = True
    else:
        mvklocation = 'temporaryLocation'
        modelverseshell = False
    """

    if args['justxml']:
        try :
            generate(output+'.xml', output, target_language, platform)
        except CompilerException as exception :
            Logger.showError(str(exception));
        return

    context = MvKLoader(mapper.rules, mapper.metamodel_location, mapper.metamodel_path, mvklocation).load(source)
    if(target_language == "javascript"):
        compiler = SCCD_to_XML(XML2JavaScriptRules().rules, context.mvk)
    else:
        compiler = SCCD_to_XML(XML2PythonRules().rules, context.mvk)
    compiler.compile(context.target+'.'+context.modelname)

    if os.path.exists(output+'.xml'):
        os.remove(output+'.xml')
    compiler.outputTo(output+'.xml')

    #Compile
    try :
        generate(output+'.xml', output, target_language, platform)
    except CompilerException as exception :
        Logger.showError(str(exception));

    """
    if(modelverseshell):
        shell = Shell()
        shell.mvk = context.mvk
        shell.setupCommandLine()
    """

if __name__ == "__main__":
    main()