from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import os
import sys
import logging

from code import InteractiveConsole
from PyQt5 import QtCore, QtGui, QtWidgets

try:
    from PyQt5 import QtWidgets
except BaseException:
    QtWidgets = QtGui

try:
    from pyqode.core.panels import CheckerPanel
    from pyqode.core import api
    from pyqode.core import modes
    from pyqode.core import panels
    from pyqode.core.api import CodeEdit, ColorScheme
    from pyqode.python.modes import PyAutoIndentMode, PythonSH
    from pyqode.python.backend import server
    from pyqode.python import modes as pymodes, panels as pypanels, widgets
    from pyqode.python.widgets import PyInteractiveConsole

    has_pyqode = True
except BaseException:
    has_pyqode = False
    CodeEdit = QtWidgets.QPlainTextEdit


class StdoutRedirector(object):
    """A class for redirecting stdout to this Text widget."""

    def __init__(self, widget):
        self.widget = widget
        self.isError = False

    def write(self, myStr):
        self.widget.moveCursor(QtGui.QTextCursor.End)
        if self.isError:
            self.widget.setTextColor(QtCore.Qt.red)
        else:
            self.widget.setTextColor(QtCore.Qt.white)
        self.widget.insertPlainText(myStr)
        self.widget.moveCursor(QtGui.QTextCursor.End)


class code_edit(QtWidgets.QWidget):
    class Console(InteractiveConsole):
        def __init__(*args):
            InteractiveConsole.__init__(*args)

        def enter(self, source):
            self.runcode(source)

    def runCode(self):
        sys.stdout = StdoutRedirector(self.output)
        sys.stderr = StdoutRedirector(self.output)
        sys.stderr.isError = True

        if not self.model:
            print("please load a model first", file=sys.stderr)
        else:
            self.c.enter(str(self.editor.toPlainText()))

        sys.stdout = sys.__stdout__
        sys.stderr = sys.__stderr__

    def select(self, product):
        self.c = self.Console({'model': self.model, 'viewer': self.viewer, 'selection': product})

    def __init__(self, viewer, snippets=None):
        self.model = None
        self.viewer = viewer
        QtWidgets.QWidget.__init__(self)
        self.layout = QtWidgets.QVBoxLayout(self)
        self.setLayout(self.layout)
        self.c = None
        self.tools = QtWidgets.QHBoxLayout(self)
        self.layout.addLayout(self.tools)
        self.runbutton = QtWidgets.QPushButton("Run")
        width = self.runbutton.fontMetrics().boundingRect("Run").width() + 20
        self.runbutton.setMaximumWidth(width)
        self.tools.addWidget(self.runbutton)
        self.runbutton.clicked.connect(self.runCode)

        editor = CodeEdit()
        if has_pyqode:
            editor.backend.start(server.__file__)
            editor.panels.append(panels.FoldingPanel())
            editor.panels.append(panels.LineNumberPanel())
            editor.panels.append(panels.SearchAndReplacePanel(),
                                 panels.SearchAndReplacePanel.Position.BOTTOM)
            editor.panels.append(panels.EncodingPanel(), api.Panel.Position.TOP)
            editor.add_separator()
            editor.panels.append(pypanels.QuickDocPanel(), api.Panel.Position.BOTTOM)
            sh = editor.modes.append(PythonSH(editor.document()))
            editor.modes.append(modes.CaretLineHighlighterMode())
            editor.modes.append(modes.CodeCompletionMode())
            editor.modes.append(modes.ExtendedSelectionMode())
            editor.modes.append(modes.FileWatcherMode())
            editor.modes.append(modes.OccurrencesHighlighterMode())
            editor.modes.append(modes.RightMarginMode())
            editor.modes.append(modes.SmartBackSpaceMode())
            editor.modes.append(modes.SymbolMatcherMode())
            editor.modes.append(modes.ZoomMode())
            editor.modes.append(pymodes.CommentsMode())
            editor.modes.append(pymodes.CalltipsMode())
            auto = pymodes.PyAutoCompleteMode()
            auto.logger.setLevel(logging.CRITICAL)
            editor.modes.append(auto)
            editor.modes.append(pymodes.PyAutoIndentMode())
            editor.modes.append(pymodes.PyIndenterMode())
            editor.show()
        else:
            editor.setStyleSheet('font-size: 10pt; font-family: Consolas, Courier;')

        self.editor = editor
        self.snippets = snippets
        if self.snippets:
            self.list = QtWidgets.QComboBox(self)
            self.replace_snippet(0)
            for snip_name in self.snippets.keys():
                self.list.addItem(snip_name)
            self.tools.addWidget(self.list)
            self.list.currentIndexChanged[int].connect(self.replace_snippet)

        self.layout.addWidget(self.editor)
        self.output = QtWidgets.QTextEdit()
        self.output.setReadOnly(True)
        self.output.setStyleSheet('font-size: 10pt; font-family: Consolas, Courier; background-color: #444;')
        self.layout.addWidget(self.output)

    def replace_snippet(self, number=None):
        snip = list(self.snippets.values())[number]
        if has_pyqode:
            self.editor.setPlainText(snip, "", "")
        else:
            self.editor.setPlainText(snip)

    def load_file(self, f, **kwargs):
        output = []
        sys.stdout = StdoutRedirector(self.output)
        self.model = f
        self.c = self.Console({'model': self.model, 'selection': None, 'viewer': self.viewer})
        sys.stdout = sys.__stdout__
