"""
Base module for loading and running the main SasView application.
"""
################################################################################
#This software was developed by the University of Tennessee as part of the
#Distributed Data Analysis of Neutron Scattering Experiments (DANSE)
#project funded by the US National Science Foundation.
#
#See the license text in license.txt
#
#copyright 2009, University of Tennessee
################################################################################
import os
import sys
import logging
import traceback


reload(sys)
sys.setdefaultencoding("iso-8859-1")


class StreamToLogger(object):
    """
        File-like stream object that redirects writes to a logger instance.
    """
    def __init__(self, logger, log_level=logging.INFO):
        self.logger = logger
        self.log_level = log_level
        self.linebuf = ''

    def write(self, buf):
        """
        Main logging method
        """
        # Write the message to stdout so we can see it when running interactively
        sys.stdout.write(buf)
        for line in buf.rstrip().splitlines():
            self.logger.log(self.log_level, line.rstrip())

PLUGIN_MODEL_DIR = 'plugin_models'
APP_NAME = 'SasView'

class SasView():
    """
    Main class for running the SasView application
    """
    def __init__(self):
        """
        """
        from sas.sasgui.guiframe.gui_manager import SasViewApp
        self.gui = SasViewApp(0)
        # Set the application manager for the GUI
        self.gui.set_manager(self)
        # Add perspectives to the basic application
        # Additional perspectives can still be loaded
        # dynamically
        # Note: py2exe can't find dynamically loaded
        # modules. We load the fitting module here
        # to ensure a complete Windows executable build.

        # Fitting perspective
        try:
            import sas.sasgui.perspectives.fitting as module
            fitting_plug = module.Plugin()
            self.gui.add_perspective(fitting_plug)
        except Exception:
            logging.error("%s: could not find Fitting plug-in module"% APP_NAME)
            logging.error(traceback.format_exc())

        # P(r) perspective
        try:
            import sas.sasgui.perspectives.pr as module
            pr_plug = module.Plugin()
            self.gui.add_perspective(pr_plug)
        except:
            logging.error("%s: could not find P(r) plug-in module"% APP_NAME)
            logging.error(traceback.format_exc())

        #Invariant perspective
        try:
            import sas.sasgui.perspectives.invariant as module
            invariant_plug = module.Plugin()
            self.gui.add_perspective(invariant_plug)
        except Exception as e :
            logging.error("%s: could not find Invariant plug-in module"% \
                          APP_NAME)
            logging.error(traceback.format_exc())

        #Calculator perspective
        try:
            import sas.sasgui.perspectives.calculator as module
            calculator_plug = module.Plugin()
            self.gui.add_perspective(calculator_plug)
        except:
            logging.error("%s: could not find Calculator plug-in module"% \
                                                        APP_NAME)
            logging.error(traceback.format_exc())


        # Add welcome page
        from .welcome_panel import WelcomePanel
        self.gui.set_welcome_panel(WelcomePanel)

        # Build the GUI
        self.gui.build_gui()
        # delete unused model folder
        self.gui.clean_plugin_models(PLUGIN_MODEL_DIR)
        # Start the main loop
        self.gui.MainLoop()


def setup_logging():
    log_file = os.path.join(os.path.expanduser("~"), 'sasview.log')
    logging.basicConfig(level=logging.INFO,
                        format='%(asctime)s %(levelname)s %(message)s',
                        filename=log_file,
                        )
    logging.captureWarnings(True)

    stderr_logger = logging.getLogger('STDERR')
    sl = StreamToLogger(stderr_logger, logging.ERROR)
    sys.stderr = sl

    # Log the start of the session
    logging.info(" --- SasView session started ---")

    # Log the python version
    logging.info("Python: %s" % sys.version)


def setup_wx():
    # Allow the dynamic selection of wxPython via an environment variable, when devs
    # who have multiple versions of the module installed want to pick between them.
    # This variable does not have to be set of course, and through normal usage will
    # probably not be, but this can make things a little easier when upgrading to a
    # new version of wx.
    WX_ENV_VAR = "SASVIEW_WX_VERSION"
    if WX_ENV_VAR in os.environ:
        logging.info("You have set the %s environment variable to %s." % \
                     (WX_ENV_VAR, os.environ[WX_ENV_VAR]))
        import wxversion
        if wxversion.checkInstalled(os.environ[WX_ENV_VAR]):
            logging.info("Version %s of wxPython is installed, so using that version." % os.environ[WX_ENV_VAR])
            wxversion.select(os.environ[WX_ENV_VAR])
        else:
            logging.error("Version %s of wxPython is not installed, so using default version." % os.environ[WX_ENV_VAR])
    else:
        logging.info("You have not set the %s environment variable, so using default version of wxPython." % WX_ENV_VAR)

    import wx

    try:
        logging.info("Wx version: %s" % wx.__version__)
    except:
        logging.error("Wx version: error reading version")

    from . import wxcruft
    wxcruft.call_later_fix()
    #wxcruft.trace_new_id()
    #Always use private .matplotlib setup to avoid conflicts with other
    #uses of matplotlib


def setup_mpl():
    import sas.sasgui
    mplconfigdir = os.path.join(sas.sasgui.get_user_dir(), '.matplotlib')
    if not os.path.exists(mplconfigdir):
        os.mkdir(mplconfigdir)
    os.environ['MPLCONFIGDIR'] = mplconfigdir
    # Set backend to WXAgg; this overrides matplotlibrc, but shouldn't override
    # mpl.use().  Note: Don't import matplotlib here since the script that
    # we are running may not actually need it; also, putting as little on the
    # path as we can
    os.environ['MPLBACKEND'] = 'WXAgg'


def run_gui():
    """
    __main__ method for loading and running SasView
    """
    from multiprocessing import freeze_support
    freeze_support()
    setup_logging()
    setup_wx()
    setup_mpl()
    SasView()


def run_cli():
    setup_mpl()
    if len(sys.argv) == 1:
        # Run sasview as an interactive python interpreter
        sys.argv = ["ipython", "--pylab"]
        from IPython import start_ipython
        sys.exit(start_ipython())
    else:
        # Run sasview as a python script interpreter
        thing_to_run = sys.argv[1]
        sys.argv = sys.argv[1:]
        import runpy
        if os.path.exists(thing_to_run):
            runpy.run_path(thing_to_run, run_name="__main__")
        else:
            runpy.run_module(thing_to_run, run_name="__main__")

if __name__ == "__main__":
    run_gui()