from __future__ import absolute_import, unicode_literals

import warnings

from django.conf import settings
from django.utils import six
from django.utils.lru_cache import lru_cache

# Always import this module as follows:
# from debug_toolbar import settings [as dt_settings]

# Don't import directly CONFIG or PANELs, or you will miss changes performed
# with override_settings in tests.


CONFIG_DEFAULTS = {
    # Toolbar options
    'DISABLE_PANELS': {'debug_toolbar.panels.redirects.RedirectsPanel'},
    'INSERT_BEFORE': '</body>',
    'RENDER_PANELS': None,
    'RESULTS_CACHE_SIZE': 10,
    'ROOT_TAG_EXTRA_ATTRS': '',
    'SHOW_COLLAPSED': False,
    'SHOW_TOOLBAR_CALLBACK': 'debug_toolbar.middleware.show_toolbar',
    # Panel options
    'EXTRA_SIGNALS': [],
    'ENABLE_STACKTRACES': True,
    'HIDE_IN_STACKTRACES': (
        'socketserver' if six.PY3 else 'SocketServer',
        'threading',
        'wsgiref',
        'debug_toolbar',
        'django.db',
        'django.core.handlers',
        'django.core.servers',
        'django.utils.decorators',
        'django.utils.deprecation',
        'django.utils.functional',
    ),
    'PROFILER_MAX_DEPTH': 10,
    'SHOW_TEMPLATE_CONTEXT': True,
    'SKIP_TEMPLATE_PREFIXES': (
        'django/forms/widgets/',
        'admin/widgets/',
    ),
    'SQL_WARNING_THRESHOLD': 500,   # milliseconds
}


@lru_cache()
def get_config():
    USER_CONFIG = getattr(settings, 'DEBUG_TOOLBAR_CONFIG', {})

    # Backward-compatibility for 1.0, remove in 2.0.
    _RENAMED_CONFIG = {
        'RESULTS_STORE_SIZE': 'RESULTS_CACHE_SIZE',
        'ROOT_TAG_ATTRS': 'ROOT_TAG_EXTRA_ATTRS',
        'HIDDEN_STACKTRACE_MODULES': 'HIDE_IN_STACKTRACES'
    }
    for old_name, new_name in _RENAMED_CONFIG.items():
        if old_name in USER_CONFIG:
            warnings.warn(
                "%r was renamed to %r. Update your DEBUG_TOOLBAR_CONFIG "
                "setting." % (old_name, new_name), DeprecationWarning)
            USER_CONFIG[new_name] = USER_CONFIG.pop(old_name)

    if 'HIDE_DJANGO_SQL' in USER_CONFIG:
        warnings.warn(
            "HIDE_DJANGO_SQL was removed. Update your "
            "DEBUG_TOOLBAR_CONFIG setting.", DeprecationWarning)
        USER_CONFIG.pop('HIDE_DJANGO_SQL')

    if 'TAG' in USER_CONFIG:
        warnings.warn(
            "TAG was replaced by INSERT_BEFORE. Update your "
            "DEBUG_TOOLBAR_CONFIG setting.", DeprecationWarning)
        USER_CONFIG['INSERT_BEFORE'] = '</%s>' % USER_CONFIG.pop('TAG')

    CONFIG = CONFIG_DEFAULTS.copy()
    CONFIG.update(USER_CONFIG)

    if 'INTERCEPT_REDIRECTS' in USER_CONFIG:
        warnings.warn(
            "INTERCEPT_REDIRECTS is deprecated. Please use the "
            "DISABLE_PANELS config in the "
            "DEBUG_TOOLBAR_CONFIG setting.", DeprecationWarning)
        if USER_CONFIG['INTERCEPT_REDIRECTS']:
            if 'debug_toolbar.panels.redirects.RedirectsPanel' \
                    in CONFIG['DISABLE_PANELS']:
                # RedirectsPanel should be enabled
                try:
                    CONFIG['DISABLE_PANELS'].remove(
                        'debug_toolbar.panels.redirects.RedirectsPanel'
                    )
                except KeyError:
                    # We wanted to remove it, but it didn't exist. This is fine
                    pass
        elif 'debug_toolbar.panels.redirects.RedirectsPanel' \
                not in CONFIG['DISABLE_PANELS']:
            # RedirectsPanel should be disabled
            CONFIG['DISABLE_PANELS'].add(
                'debug_toolbar.panels.redirects.RedirectsPanel'
            )

    return CONFIG


PANELS_DEFAULTS = [
    'debug_toolbar.panels.versions.VersionsPanel',
    'debug_toolbar.panels.timer.TimerPanel',
    'debug_toolbar.panels.settings.SettingsPanel',
    'debug_toolbar.panels.headers.HeadersPanel',
    'debug_toolbar.panels.request.RequestPanel',
    'debug_toolbar.panels.sql.SQLPanel',
    'debug_toolbar.panels.staticfiles.StaticFilesPanel',
    'debug_toolbar.panels.templates.TemplatesPanel',
    'debug_toolbar.panels.cache.CachePanel',
    'debug_toolbar.panels.signals.SignalsPanel',
    'debug_toolbar.panels.logging.LoggingPanel',
    'debug_toolbar.panels.redirects.RedirectsPanel',
]


@lru_cache()
def get_panels():
    try:
        PANELS = list(settings.DEBUG_TOOLBAR_PANELS)
    except AttributeError:
        PANELS = PANELS_DEFAULTS
    else:
        # Backward-compatibility for 1.0, remove in 2.0.
        _RENAMED_PANELS = {
            'debug_toolbar.panels.version.VersionDebugPanel':
            'debug_toolbar.panels.versions.VersionsPanel',
            'debug_toolbar.panels.timer.TimerDebugPanel':
            'debug_toolbar.panels.timer.TimerPanel',
            'debug_toolbar.panels.settings_vars.SettingsDebugPanel':
            'debug_toolbar.panels.settings.SettingsPanel',
            'debug_toolbar.panels.headers.HeaderDebugPanel':
            'debug_toolbar.panels.headers.HeadersPanel',
            'debug_toolbar.panels.request_vars.RequestVarsDebugPanel':
            'debug_toolbar.panels.request.RequestPanel',
            'debug_toolbar.panels.sql.SQLDebugPanel':
            'debug_toolbar.panels.sql.SQLPanel',
            'debug_toolbar.panels.template.TemplateDebugPanel':
            'debug_toolbar.panels.templates.TemplatesPanel',
            'debug_toolbar.panels.cache.CacheDebugPanel':
            'debug_toolbar.panels.cache.CachePanel',
            'debug_toolbar.panels.signals.SignalDebugPanel':
            'debug_toolbar.panels.signals.SignalsPanel',
            'debug_toolbar.panels.logger.LoggingDebugPanel':
            'debug_toolbar.panels.logging.LoggingPanel',
            'debug_toolbar.panels.redirects.InterceptRedirectsDebugPanel':
            'debug_toolbar.panels.redirects.RedirectsPanel',
            'debug_toolbar.panels.profiling.ProfilingDebugPanel':
            'debug_toolbar.panels.profiling.ProfilingPanel',
        }
        for index, old_panel in enumerate(PANELS):
            new_panel = _RENAMED_PANELS.get(old_panel)
            if new_panel is not None:
                warnings.warn(
                    "%r was renamed to %r. Update your DEBUG_TOOLBAR_PANELS "
                    "setting." % (old_panel, new_panel), DeprecationWarning)
                PANELS[index] = new_panel
    return PANELS
