# -*- coding: utf-8 -*-
"""KiCad Python Shell.

This module provides the python shell for KiCad.

Currently the shell is only available inside PCBNEW.

PCBNEW starts the shell once, by calling makePcbnewShellWindow() the
first time it is opened, subsequently the shell window is just hidden
or shown, as per user requirements.

IF makePcbnewShellWindow() is called again, a second/third shell window
can be created.  PCBNEW does not do this, but a user may call this from
the first shell if they require.

"""
import wx
import sys
import os

from wx.py import crust, editor, version, dispatcher
from wx.py.editor import EditorNotebook

import pcbnew

INTRO = "KiCAD:PCBNEW - Python Shell - PyAlaMode %s" % version.VERSION


class PcbnewPyShell(editor.EditorNotebookFrame):

    """The Pythonshell of PCBNEW."""

    def _setup_startup(self):
        """Initialise the startup script."""
        # Create filename for startup script.
        self.startup_file = os.path.join(self.config_dir,
                                         "PyShell_pcbnew_startup.py")
        self.execStartupScript = True

        # Check if startup script exists
        if not os.path.isfile(self.startup_file):
            # Not, so create a default.
            default_startup = open(self.startup_file, 'w')
            # provide the content for the default startup file.
            default_startup.write(
                "### DEFAULT STARTUP FILE FOR KiCad:PCBNEW Python Shell\n" +
                "# Enter any Python code you would like to execute when" +
                " the PCBNEW python shell first runs.\n" +
                "\n" +
                "# Eg:\n" +
                "\n" +
                "# import pcbnew\n" +
                "# board = pcbnew.GetBoard()\n")
            default_startup.close()

    def _setup(self):
        """
        Setup prior to first buffer creation.

        Called automatically by base class during init.
        """
        self.notebook = EditorNotebook(parent=self)
        intro = 'Py %s' % version.VERSION
        import imp
        module = imp.new_module('__main__')
        if sys.version_info >= (3,):
            import builtins
            module.__dict__['__builtins__'] = builtins
        else:
            import __builtin__
            module.__dict__['__builtins__'] = __builtin__
        namespace = module.__dict__.copy()

        self.config_dir = pcbnew.SETTINGS_MANAGER.GetUserSettingsPath()
        self.dataDir = self.config_dir

        self._setup_startup()
        self.history_file = os.path.join(self.config_dir,
                                         "PyShell_pcbnew.history")

        self.config_file = os.path.join(self.config_dir,
                                        "PyShell_pcbnew.cfg")
        self.config = wx.FileConfig(localFilename=self.config_file)
        self.config.SetRecordDefaults(True)
        self.autoSaveSettings = False
        self.autoSaveHistory = False
        self.LoadSettings()

        # in case of wxPhoenix we need to create a wxApp first and store it
        # to prevent removal by gabage collector
        if 'phoenix' in wx.PlatformInfo:
            self.theApp = wx.App()

        self.crust = crust.Crust(parent=self.notebook,
                                 intro=intro, locals=namespace,
                                 rootLabel="locals()",
                                 startupScript=self.startup_file,
                                 execStartupScript=self.execStartupScript)

        self.shell = self.crust.shell
        # Override the filling so that status messages go to the status bar.
        self.crust.filling.tree.setStatusText = self.SetStatusText
        # Override the shell so that status messages go to the status bar.
        self.shell.setStatusText = self.SetStatusText
        # Fix a problem with the sash shrinking to nothing.
        self.crust.filling.SetSashPosition(200)
        self.notebook.AddPage(page=self.crust, text='*Shell*', select=True)
        self.setEditor(self.crust.editor)
        self.crust.editor.SetFocus()

        self.LoadHistory()

    def OnAbout(self, event):
        """Display an About window."""
        title = 'About : KiCad:PCBNEW - Python Shell'
        text = "Enhanced Python Shell for KiCad:PCBNEW\n\n" + \
               "This KiCad Python Shell is based on wxPython PyAlaMode.\n\n" + \
               "see: http://wiki.wxpython.org/PyAlaMode\n\n" + \
               "KiCad Revision: %s\n" % "??.??" + \
               "PyAlaMode Revision : %s\n" % version.VERSION + \
               "Platform: %s\n" % sys.platform + \
               "Python Version: %s\n" % sys.version.split()[0] + \
               "wxPython Version: %s\n" % wx.VERSION_STRING + \
               ("\t(%s)\n" % ", ".join(wx.PlatformInfo[1:]))

        dialog = wx.MessageDialog(self, text, title,
                                  wx.OK | wx.ICON_INFORMATION)
        dialog.ShowModal()
        dialog.Destroy()

    def EditStartupScript(self):
        """Open a Edit buffer of the startup script file."""
        self.bufferCreate(filename=self.startup_file)

    def LoadSettings(self):
        """Load settings for the shell."""
        if self.config is not None:
            editor.EditorNotebookFrame.LoadSettings(self, self.config)
            self.autoSaveSettings = \
                self.config.ReadBool('Options/AutoSaveSettings', False)
            self.execStartupScript = \
                self.config.ReadBool('Options/ExecStartupScript', True)
            self.autoSaveHistory = \
                self.config.ReadBool('Options/AutoSaveHistory', False)
            self.hideFoldingMargin = \
                self.config.ReadBool('Options/HideFoldingMargin', True)

    def SaveSettings(self, force=False):
        """
        Save settings for the shell.

        Arguments:

        force -- False - Autosaving.  True - Manual Saving.
        """
        if self.config is not None:
            # always save these
            self.config.WriteBool('Options/AutoSaveSettings',
                                  self.autoSaveSettings)
            if self.autoSaveSettings or force:
                editor.EditorNotebookFrame.SaveSettings(self, self.config)

                self.config.WriteBool('Options/AutoSaveHistory',
                                      self.autoSaveHistory)
                self.config.WriteBool('Options/ExecStartupScript',
                                      self.execStartupScript)
                self.config.WriteBool('Options/HideFoldingMargin',
                                      self.hideFoldingMargin)
            if self.autoSaveHistory:
                self.SaveHistory()

    def DoSaveSettings(self):
        """Menu function to trigger saving the shells settings."""
        if self.config is not None:
            self.SaveSettings(force=True)
            self.config.Flush()

    def SaveHistory(self):
        """Save shell history to the shell history file."""
        if self.dataDir:
            try:
                name = self.history_file
                f = file(name, 'w')
                hist = []
                enc = wx.GetDefaultPyEncoding()
                for h in self.shell.history:
                    if isinstance(h, unicode):
                        h = h.encode(enc)
                    hist.append(h)
                hist = '\x00\n'.join(hist)
                f.write(hist)
                f.close()
            except:
                d = wx.MessageDialog(self, "Error saving history file.",
                                     "Error", wx.ICON_EXCLAMATION | wx.OK)
                d.ShowModal()
                d.Destroy()
                raise

    def LoadHistory(self):
        """Load shell history from the shell history file."""
        if self.dataDir:
            name = self.history_file
            if os.path.exists(name):
                try:
                    f = file(name, 'U')
                    hist = f.read()
                    f.close()
                    self.shell.history = hist.split('\x00\n')
                    dispatcher.send(signal="Shell.loadHistory",
                                    history=self.shell.history)
                except:
                    d = wx.MessageDialog(self,
                                         "Error loading history file!",
                                         "Error", wx.ICON_EXCLAMATION | wx.OK)
                    d.ShowModal()
                    d.Destroy()


def makePcbnewShellWindow(parent=None):
    """
    Create a new Shell Window and return its handle.

    Arguments:
    parent -- The parent window to attach to.

    Returns:
    The handle to the new window.
    """
    pyshell = PcbnewPyShell(parent, id=-1, title=INTRO)
    pyshell.Show()
    return pyshell
