#!/usr/bin/env python
# encoding: utf-8
"""
The :class:`~IPython.core.application.Application` object for the command
line :command:`ipython` program.
"""

# Copyright (c) IPython Development Team.
# Distributed under the terms of the Modified BSD License.


import logging
import os
import sys
import warnings

from traitlets.config.loader import Config
from traitlets.config.application import boolean_flag, catch_config_error
from IPython.core import release
from IPython.core import usage
from IPython.core.completer import IPCompleter
from IPython.core.crashhandler import CrashHandler
from IPython.core.formatters import PlainTextFormatter
from IPython.core.history import HistoryManager
from IPython.core.application import (
    ProfileDir, BaseIPythonApplication, base_flags, base_aliases
)
from IPython.core.magics import (
    ScriptMagics, LoggingMagics
)
from IPython.core.shellapp import (
    InteractiveShellApp, shell_flags, shell_aliases
)
from IPython.extensions.storemagic import StoreMagics
from .interactiveshell import TerminalInteractiveShell
from IPython.paths import get_ipython_dir
from traitlets import (
    Bool, List, default, observe, Type
)

#-----------------------------------------------------------------------------
# Globals, utilities and helpers
#-----------------------------------------------------------------------------

_examples = """
ipython --matplotlib       # enable matplotlib integration
ipython --matplotlib=qt    # enable matplotlib integration with qt4 backend

ipython --log-level=DEBUG  # set logging to DEBUG
ipython --profile=foo      # start with profile foo

ipython profile create foo # create profile foo w/ default config files
ipython help profile       # show the help for the profile subcmd

ipython locate             # print the path to the IPython directory
ipython locate profile foo # print the path to the directory for profile `foo`
"""

#-----------------------------------------------------------------------------
# Crash handler for this application
#-----------------------------------------------------------------------------

class IPAppCrashHandler(CrashHandler):
    """sys.excepthook for IPython itself, leaves a detailed report on disk."""

    def __init__(self, app):
        contact_name = release.author
        contact_email = release.author_email
        bug_tracker = 'https://github.com/ipython/ipython/issues'
        super(IPAppCrashHandler,self).__init__(
            app, contact_name, contact_email, bug_tracker
        )

    def make_report(self,traceback):
        """Return a string containing a crash report."""

        sec_sep = self.section_sep
        # Start with parent report
        report = [super(IPAppCrashHandler, self).make_report(traceback)]
        # Add interactive-specific info we may have
        rpt_add = report.append
        try:
            rpt_add(sec_sep+"History of session input:")
            for line in self.app.shell.user_ns['_ih']:
                rpt_add(line)
            rpt_add('\n*** Last line of input (may not be in above history):\n')
            rpt_add(self.app.shell._last_input_line+'\n')
        except:
            pass

        return ''.join(report)

#-----------------------------------------------------------------------------
# Aliases and Flags
#-----------------------------------------------------------------------------
flags = dict(base_flags)
flags.update(shell_flags)
frontend_flags = {}
addflag = lambda *args: frontend_flags.update(boolean_flag(*args))
addflag('autoedit-syntax', 'TerminalInteractiveShell.autoedit_syntax',
        'Turn on auto editing of files with syntax errors.',
        'Turn off auto editing of files with syntax errors.'
)
addflag('simple-prompt', 'TerminalInteractiveShell.simple_prompt',
        "Force simple minimal prompt using `raw_input`",
        "Use a rich interactive prompt with prompt_toolkit",
)

addflag('banner', 'TerminalIPythonApp.display_banner',
        "Display a banner upon starting IPython.",
        "Don't display a banner upon starting IPython."
)
addflag('confirm-exit', 'TerminalInteractiveShell.confirm_exit',
    """Set to confirm when you try to exit IPython with an EOF (Control-D
    in Unix, Control-Z/Enter in Windows). By typing 'exit' or 'quit',
    you can force a direct exit without any confirmation.""",
    "Don't prompt the user when exiting."
)
addflag('term-title', 'TerminalInteractiveShell.term_title',
    "Enable auto setting the terminal title.",
    "Disable auto setting the terminal title."
)
classic_config = Config()
classic_config.InteractiveShell.cache_size = 0
classic_config.PlainTextFormatter.pprint = False
classic_config.TerminalInteractiveShell.prompts_class='IPython.terminal.prompts.ClassicPrompts'
classic_config.InteractiveShell.separate_in = ''
classic_config.InteractiveShell.separate_out = ''
classic_config.InteractiveShell.separate_out2 = ''
classic_config.InteractiveShell.colors = 'NoColor'
classic_config.InteractiveShell.xmode = 'Plain'

frontend_flags['classic']=(
    classic_config,
    "Gives IPython a similar feel to the classic Python prompt."
)
# # log doesn't make so much sense this way anymore
# paa('--log','-l',
#     action='store_true', dest='InteractiveShell.logstart',
#     help="Start logging to the default log file (./ipython_log.py).")
#
# # quick is harder to implement
frontend_flags['quick']=(
    {'TerminalIPythonApp' : {'quick' : True}},
    "Enable quick startup with no config files."
)

frontend_flags['i'] = (
    {'TerminalIPythonApp' : {'force_interact' : True}},
    """If running code from the command line, become interactive afterwards.
    It is often useful to follow this with `--` to treat remaining flags as
    script arguments.
    """
)
flags.update(frontend_flags)

aliases = dict(base_aliases)
aliases.update(shell_aliases)

#-----------------------------------------------------------------------------
# Main classes and functions
#-----------------------------------------------------------------------------


class LocateIPythonApp(BaseIPythonApplication):
    description = """print the path to the IPython dir"""
    subcommands = dict(
        profile=('IPython.core.profileapp.ProfileLocate',
            "print the path to an IPython profile directory",
        ),
    )
    def start(self):
        if self.subapp is not None:
            return self.subapp.start()
        else:
            print(self.ipython_dir)


class TerminalIPythonApp(BaseIPythonApplication, InteractiveShellApp):
    name = u'ipython'
    description = usage.cl_usage
    crash_handler_class = IPAppCrashHandler
    examples = _examples

    flags = flags
    aliases = aliases
    classes = List()

    interactive_shell_class = Type(
        klass=object,   # use default_value otherwise which only allow subclasses.
        default_value=TerminalInteractiveShell,
        help="Class to use to instantiate the TerminalInteractiveShell object. Useful for custom Frontends"
    ).tag(config=True)

    @default('classes')
    def _classes_default(self):