# -*- coding: utf-8; mode: python; -*-
#
#  GStreamer Debug Viewer - View and analyze GStreamer debug log files
#
#  Copyright (C) 2007 René Stadler <mail@renestadler.de>
#
#  This program is free software; you can redistribute it and/or modify it
#  under the terms of the GNU General Public License as published by the Free
#  Software Foundation; either version 3 of the License, or (at your option)
#  any later version.
#
#  This program is distributed in the hope that it will be useful, but WITHOUT
#  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
#  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
#  more details.
#
#  You should have received a copy of the GNU General Public License along with
#  this program.  If not, see <http://www.gnu.org/licenses/>.

"""GStreamer Debug Viewer GUI module."""

def _ (s):
    return s

import logging

import gtk

from GstDebugViewer import Common, Data
from GstDebugViewer.GUI.colors import LevelColorThemeTango
from GstDebugViewer.GUI.models import LazyLogModel, LogModelBase

# Sync with gst-inspector!
class Column (object):

    """A single list view column, managed by a ColumnManager instance."""

    name = None
    id = None
    label_header = None
    get_modify_func = None
    get_data_func = None
    get_row_data_func = None
    get_sort_func = None

    def __init__ (self):

        view_column = gtk.TreeViewColumn (self.label_header)
        view_column.props.reorderable = True

        self.view_column = view_column

class SizedColumn (Column):

    default_size = None

    def compute_default_size (self, view, model):

        return None

# Sync with gst-inspector?
class TextColumn (SizedColumn):

    font_family = None

    def __init__ (self):

        Column.__init__ (self)

        column = self.view_column
        cell = gtk.CellRendererText ()
        column.pack_start (cell)

        cell.props.yalign = 0.
        cell.props.ypad = 0

        if self.font_family:
            cell.props.family = self.font_family
            cell.props.family_set = True

        if self.get_data_func:
            data_func = self.get_data_func ()
            assert data_func
            id_ = self.id
            if id_ is not None:
                def cell_data_func (column, cell, model, tree_iter):
                    data_func (cell.props, model.get_value (tree_iter, id_), model.get_path (tree_iter))
            else:
                cell_data_func = data_func
            column.set_cell_data_func (cell, cell_data_func)
        elif self.get_row_data_func:
            data_func = self.get_row_data_func ()
            assert data_func
            def cell_data_func (column, cell, model, tree_iter):
                data_func (cell.props, model[tree_iter])
            column.set_cell_data_func (cell, cell_data_func)
        elif not self.get_modify_func:
            column.add_attribute (cell, "text", self.id)
        else:
            self.update_modify_func (column, cell)

        column.props.resizable = True

    def update_modify_func (self, column, cell):

        modify_func = self.get_modify_func ()
        id_ = self.id
        def cell_data_func (column, cell, model, tree_iter):
            cell.props.text = modify_func (model.get (tree_iter, id_)[0])
        column.set_cell_data_func (cell, cell_data_func)

    def compute_default_size (self, view, model):

        values = self.get_values_for_size ()
        if not values:
            return SizedColumn.compute_default_size (self, view, model)

        cell = self.view_column.get_cell_renderers ()[0]

        if self.get_modify_func is not None:
            format = self.get_modify_func ()
        else:
            def identity (x):
                return x
            format = identity
        max_width = 0
        for value in values:
            cell.props.text = format (value)
            rect, x, y, w, h = self.view_column.cell_get_size ()
            max_width = max (max_width, w)

        return max_width

    def get_values_for_size (self):

        return ()

class TimeColumn (TextColumn):

    name = "time"
    label_header = _("Time")
    id = LazyLogModel.COL_TIME
    font_family = "monospace"

    def __init__ (self, *a, **kw):

        self.base_time = 0

        TextColumn.__init__ (self, *a, **kw)

    def get_modify_func (self):

        if self.base_time:
            time_diff_args = Data.time_diff_args
            base_time = self.base_time
            def format_time (value):
                # TODO: Hard coded to omit trailing zeroes, see below.
                return time_diff_args (value - base_time)[:-3]
        else:
            time_args = Data.time_args
            def format_time (value):
                # TODO: This is hard coded to omit hours as well as the last 3
                # digits at the end, since current gst uses g_get_current_time,
                # which has microsecond precision only.
                return time_args (value)[2:-3]

        return format_time

    def get_values_for_size (self):

        values = [0]

        return values

    def set_base_time (self, base_time):

        self.base_time = base_time

        column = self.view_column
        cell = column.get_cell_renderers ()[0]
        self.update_modify_func (column, cell)

class LevelColumn (TextColumn):

    name = "level"
    label_header = _("L")
    id = LazyLogModel.COL_LEVEL

    def __init__ (self):

        TextColumn.__init__ (self)

        cell = self.view_column.get_cell_renderers ()[0]
        cell.props.xalign = .5

    @staticmethod
    def get_modify_func ():

        def format_level (value):
            return value.name[0]

        return format_level

    @staticmethod
    def get_data_func ():

        theme = LevelColorThemeTango ()
        colors = dict ((level, tuple ((c.gdk_color ()
                                       for c in theme.colors[level])),)
                       for level in Data.debug_levels
                       if level != Data.debug_level_none)
        def level_data_func (cell_props, level, path):
            cell_props.text = level.name[0]
            if level in colors:
                cell_colors = colors[level]
            else:
                cell_colors = (None, None, None,)
            cell_props.foreground_gdk = cell_colors[0]
            cell_props.background_gdk = cell_colors[1]

        return level_data_func

    def get_values_for_size (self):

        values = [Data.debug_level_log, Data.debug_level_debug,
                  Data.debug_level_info, Data.debug_level_warning,
                  Data.debug_level_error]

        return values

class PidColumn (TextColumn):

    name = "pid"
    label_header = _("PID")
    id = LazyLogModel.COL_PID
    font_family = "monospace"

    @staticmethod
    def get_modify_func ():

        return str

    def get_values_for_size (self):

        return ["999999"]

class ThreadColumn (TextColumn):

    name = "thread"
    label_header = _("Thread")
    id = LazyLogModel.COL_THREAD
    font_family = "monospace"

    @staticmethod
    def get_modify_func ():

        def format_thread (value):
            return "0x%07x" % (value,)

        return format_thread

    def get_values_for_size (self):

        return [int ("ffffff", 16)]

class CategoryColumn (TextColumn):

    name = "category"
    label_header = _("Category")
    id = LazyLogModel.COL_CATEGORY

    def get_values_for_size (self):

        return ["GST_LONG_CATEGORY", "somelongelement"]

class CodeColumn (TextColumn):

    name = "code"
    label_header = _("Code")
    id = None

    @staticmethod
    def get_data_func ():

        filename_id = LogModelBase.COL_FILENAME
        line_number_id = LogModelBase.COL_LINE_NUMBER
        def filename_data_func (column, cell, model, tree_iter):
            args = model.get (tree_iter, filename_id, line_number_id)
            cell.props.text = "%s:%i" % args

        return filename_data_func

    def get_values_for_size (self):

        return ["gstsomefilename.c:1234"]

class FunctionColumn (TextColumn):

    name = "function"
    label_header = _("Function")
    id = LazyLogModel.COL_FUNCTION

    def get_values_for_size (self):

        return ["gst_this_should_be_enough"]

class ObjectColumn (TextColumn):

    name = "object"
    label_header = _("Object")
    id = LazyLogModel.COL_OBJECT

    def get_values_for_size (self):

        return ["longobjectname00"]

class MessageColumn (TextColumn):

    name = "message"
    label_header = _("Message")
    id = LazyLogModel.COL_MESSAGE

    def __init__ (self, *a, **kw):

        self.highlighters = {}

        TextColumn.__init__ (self, *a, **kw)

    def get_row_data_func (self):

        from pango import AttrList, AttrBackground, AttrForeground
        highlighters = self.highlighters
        id_ = self.id

        # FIXME: This should be none; need to investigate
        # `cellrenderertext.props.attributes = None' failure (param conversion
        # error like `treeview.props.model = None').
        no_attrs = AttrList ()

        def message_data_func (props, row):

            props.text = row[id_]
            if not highlighters:
                props.attributes = no_attrs
            for highlighter in highlighters.values ():
                ranges = highlighter (row)
                if not ranges:
                    props.attributes = no_attrs
                else:
                    attrlist = AttrList ()
                    for start, end in ranges:
                        attrlist.insert (AttrBackground (0, 0, 65535, start, end))
                        attrlist.insert (AttrForeground (65535, 65535, 65535, start, end))
                    props.attributes = attrlist

        return message_data_func

    def get_values_for_size (self):

        values = ["Just some good minimum size"]

        return values

class ColumnManager (Common.GUI.Manager):

    column_classes = ()

    @classmethod
    def iter_item_classes (cls):

        return iter (cls.column_classes)

    def __init__ (self):

        self.view = None
        self.actions = None
        self.zoom = 1.0
        self.__columns_changed_id = None
        self.columns = []
        self.column_order = list (self.column_classes)

        self.action_group = gtk.ActionGroup ("ColumnActions")

        def make_entry (col_class):
            return ("show-%s-column" % (col_class.name,),
                    None,
                    col_class.label_header,
                    None,
                    None,
                    None,
                    True,)

        entries = [make_entry (cls) for cls in self.column_classes]
        self.action_group.add_toggle_actions (entries)

    def iter_items (self):

        return iter (self.columns)

    def attach (self):

        for col_class in self.column_classes:
            action = self.get_toggle_action (col_class)
            if action.props.active:
                self._add_column (col_class ())
            action.connect ("toggled",
                            self.__handle_show_column_action_toggled,
                            col_class.name)

        self.__columns_changed_id = self.view.connect ("columns-changed",
                                                       self.__handle_view_columns_changed)

    def detach (self):

        if self.__columns_changed_id is not None:
            self.view.disconnect (self.__columns_changed_id)
            self.__columns_changed_id = None

    def attach_sort (self):

        sort_model = self.view.get_model ()

        # Inform the sorted tree model of any custom sorting functions.
        for col_class in self.column_classes:
            if col_class.get_sort_func:
                sort_func = col_class.get_sort_func ()
                sort_model.set_sort_func (col_class.id, sort_func)

    def enable_sort (self):

        sort_model = self.view.get_model ()

        if sort_model:
            self.logger.debug ("activating sort")
            sort_model.set_sort_column_id (*self.default_sort)
            self.default_sort = None
        else:
            self.logger.debug ("not activating sort (no model set)")

    def disable_sort (self):

        self.logger.debug ("deactivating sort")

        sort_model = self.view.get_model ()

        self.default_sort = tree_sortable_get_sort_column_id (sort_model)

        sort_model.set_sort_column_id (TREE_SORTABLE_UNSORTED_COLUMN_ID,
                                       gtk.SORT_ASCENDING)

    def set_zoom (self, scale):

        for column in self.columns:
            cell = column.view_column.get_cell_renderers ()[0]
            cell.props.scale = scale
            column.view_column.queue_resize ()

        self.zoom = scale

    def get_toggle_action (self, column_class):

        action_name = "show-%s-column" % (column_class.name,)
        return self.action_group.get_action (action_name)

    def get_initial_column_order (self):

        return tuple (self.column_classes)

    def _add_column (self, column):

        name = column.name
        pos = self.__get_column_insert_position (column)

        if self.view.props.fixed_height_mode:
            column.view_column.props.sizing = gtk.TREE_VIEW_COLUMN_FIXED

        cell = column.view_column.get_cell_renderers ()[0]
        cell.props.scale = self.zoom

        self.columns.insert (pos, column)
        self.view.insert_column (column.view_column, pos)

    def _remove_column (self, column):

        self.columns.remove (column)
        self.view.remove_column (column.view_column)

    def __get_column_insert_position (self, column):

        col_class = self.find_item_class (name = column.name)
        pos = self.column_order.index (col_class)
        before = self.column_order[:pos]
        shown_names = [col.name for col in self.columns]
        for col_class in before:
            if not col_class.name in shown_names:
                pos -= 1
        return pos

    def __iter_next_hidden (self, column_class):

        pos = self.column_order.index (column_class)
        rest = self.column_order[pos + 1:]
        for next_class in rest:
            try:
                self.find_item (name = next_class.name)
            except KeyError:
                # No instance -- the column is hidden.
                yield next_class
            else:
                break

    def __handle_show_column_action_toggled (self, toggle_action, name):

        if toggle_action.props.active:
            try:
                # This should fail.
                column = self.find_item (name = name)
            except KeyError:
                col_class = self.find_item_class (name = name)
                self._add_column (col_class ())
            else:
                # Out of sync for some reason.
                return
        else:
            try:
                column = self.find_item (name = name)
            except KeyError:
                # Out of sync for some reason.
                return
            else:
                self._remove_column (column)

    def __handle_view_columns_changed (self, element_view):

        view_columns = element_view.get_columns ()
        new_visible = [self.find_item (view_column = column)
                       for column in view_columns]

        # We only care about reordering here.
        if len (new_visible) != len (self.columns):
            return

        if new_visible != self.columns:

            new_order = []
            for column in new_visible:
                col_class = self.find_item_class (name = column.name)
                new_order.append (col_class)
                new_order.extend (self.__iter_next_hidden (col_class))

            names = (column.name for column in new_visible)
            self.logger.debug ("visible columns reordered: %s",
                               ", ".join (names))

            self.columns[:] = new_visible
            self.column_order[:] = new_order

class ViewColumnManager (ColumnManager):

    column_classes = (TimeColumn, LevelColumn, PidColumn, ThreadColumn, CategoryColumn,
                      CodeColumn, FunctionColumn, ObjectColumn, MessageColumn,)

    def __init__ (self, state):

        ColumnManager.__init__ (self)

        self.logger = logging.getLogger ("ui.columns")

        self.state = state

    def attach (self, view):

        self.view = view
        view.connect ("notify::model", self.__handle_notify_model)

        order = self.state.column_order
        if len (order) == len (self.column_classes):
            self.column_order[:] = order

        visible = self.state.columns_visible
        if not visible:
            visible = self.column_classes
        for col_class in self.column_classes:
            action = self.get_toggle_action (col_class)
            action.props.active = (col_class in visible)

        ColumnManager.attach (self)

        self.columns_sized = False

    def detach (self):

        self.state.column_order = self.column_order
        self.state.columns_visible = self.columns

        return ColumnManager.detach (self)

    def set_zoom (self, scale):

        ColumnManager.set_zoom (self, scale)

        if self.view is None:
            return

        model = self.view.get_model ()

        # Timestamp and log level columns are pretty much fixed size, so resize
        # them back to default on zoom change:
        for column in self.columns:
            if column.name in (TimeColumn.name,
                               LevelColumn.name):
                self.size_column (column, self.view, model)

    def size_column (self, column, view, model):

        if column.default_size is None:
            default_size = column.compute_default_size (view, model)
        else:
            default_size = column.default_size
        # FIXME: Abstract away fixed size setting in Column class!
        if default_size is None:
            # Dummy fallback:
            column.view_column.props.fixed_width = 50
            self.logger.warning ("%s column does not implement default size", column.name)
        else:
            column.view_column.props.fixed_width = default_size

    def _add_column (self, column):

        result = ColumnManager._add_column (self, column)
        model = self.view.get_model ()
        self.size_column (column, self.view, model)
        return result

    def _remove_column (self, column):

        column.default_size = column.view_column.props.fixed_width
        return ColumnManager._remove_column (self, column)

    def __handle_notify_model (self, view, gparam):

        if self.columns_sized:
            # Already sized.
            return
        model = self.view.get_model ()
        if model is None:
            return
        self.logger.debug ("model changed, sizing columns")
        for column in self.iter_items ():
            self.size_column (column, view, model)
        self.columns_sized = True

class WrappingMessageColumn (MessageColumn):

    def wrap_to_width (self, width):

        col = self.view_column
        col.props.max_width = width
        col.get_cell_renderers ()[0].props.wrap_width = width
        col.queue_resize ()

class LineViewColumnManager (ColumnManager):

    column_classes = (TimeColumn, WrappingMessageColumn,)

    def __init__ (self):

        ColumnManager.__init__ (self)

    def attach (self, window):

        self.__size_update = None

        self.view = window.widgets.line_view
        self.view.set_size_request (0, 0)
        self.view.connect_after ("size-allocate", self.__handle_size_allocate)
        ColumnManager.attach (self)

    def __update_sizes (self):

        view_width = self.view.get_allocation ().width
        if view_width == self.__size_update:
            # Prevent endless recursion.
            return

        self.__size_update = view_width

        col = self.find_item (name = "time")
        other_width = col.view_column.props.width

        try:
            col = self.find_item (name = "message")
        except KeyError:
            return

        width = view_width - other_width
        col.wrap_to_width (width)

    def __handle_size_allocate (self, self_, allocation):

        self.__update_sizes ()