'''
Created on Nov 29, 2016

@author: wpotrzebowski
'''

import os
import warnings

import wx
import wx.richtext
import wx.lib.hyperlink

from sas.sasgui.guiframe.documentation_window import DocumentationWindow

class GpuOptions(wx.Dialog):
    """
    "Acknowledgement" Dialog Box

    Shows the current method for acknowledging SasView in
    scholarly publications.

    """

    def __init__(self, *args, **kwds):

        kwds["style"] = wx.DEFAULT_DIALOG_STYLE
        wx.Dialog.__init__(self, *args, **kwds)

        clinfo = self._get_clinfo()

        self.panel1 = wx.Panel(self, -1)
        static_box1 = wx.StaticBox(self.panel1, -1, "Available OpenCL Options:")

        boxsizer = wx.BoxSizer(orient=wx.VERTICAL)
        self.option_button = {}
        for index, clopt in enumerate(clinfo):
            button = wx.RadioButton(self.panel1, -1, label=clopt, name=clopt)
            if clopt != "No OpenCL":
                self.option_button[clopt] = str(index)
            else:
                self.option_button[clopt] = "None"
            self.Bind(wx.EVT_RADIOBUTTON, self.on_radio, id=button.GetId())
            boxsizer.Add(button, 0, 0)

        fit_hsizer = wx.StaticBoxSizer(static_box1, orient=wx.VERTICAL)
        fit_hsizer.Add(boxsizer, 0, wx.ALL, 5)

        self.panel1.SetSizer(fit_hsizer)

        self.vbox = wx.BoxSizer(wx.VERTICAL)
        self.vbox.Add(self.panel1, 0, wx.ALL, 10)

        accept_btn = wx.Button(self, wx.ID_OK)
        accept_btn.SetToolTipString("Accept OpenCL settings")

        help_btn = wx.Button(self, wx.ID_HELP, 'Help')
        help_btn.SetToolTipString("Help on the GPU options")

        self.Bind(wx.EVT_BUTTON, self.on_accept, accept_btn)
        self.Bind(wx.EVT_BUTTON, self.on_help, help_btn)
        self.Bind(wx.EVT_CLOSE, self.on_close)

        btn_sizer = wx.BoxSizer(wx.HORIZONTAL)
        btn_sizer.Add((10, 20), 1) # stretchable whitespace
        btn_sizer.Add(accept_btn, 0)
        btn_sizer.Add((10, 20), 0) # non-stretchable whitespace
        btn_sizer.Add(help_btn, 0)

        # Add the button sizer to the main sizer.
        self.vbox.Add(btn_sizer, 0, wx.EXPAND|wx.ALL, 10)

        self.SetSizer(self.vbox)
        self.vbox.Fit(self)

        self.Centre()

    def _get_clinfo(self):
        try:
            import pyopencl as cl
            clinfo = []
            for platform in cl.get_platforms():
                for device in platform.get_devices():
                    clinfo.append(device.name)
            clinfo.append("No OpenCL")
        except ImportError:
            warnings.warn("pyopencl import failed")
            clinfo = None
        return clinfo

    def on_radio(self, event):
        """
        Action triggered when button is selected
        :param event:
        :return:
        """

        import sasmodels
        button = event.GetEventObject()
        os.environ["SAS_OPENCL"] = self.option_button[button.Name]
        sasmodels.kernelcl.ENV = None
        #Need to reload sasmodels.core module to account SAS_OPENCL = "None"
        reload(sasmodels.core)

    def on_accept(self, event):
        """
        Close window on accpetance
        """
        event.Skip()

    def on_help(self):
        """
        Provide help on opencl options.
        """
        TreeLocation = "user/gpu_computations.html"
        anchor = "#device-selection"
        DocumentationWindow(self, -1,
                            TreeLocation, anchor, "OpenCL Options Help")

    def on_close(self, event):
        """
        Close window
        """
        event.Skip()