# -*- coding: utf-8 -*-
# Copyright 2004-2005 Joe Wreschnig, Michael Urman, Iñigo Serna
#
# 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 2 of the License, or
# (at your option) any later version.

import os
import errno
from urllib.parse import urlsplit

from gi.repository import Gtk, GObject, Gdk, Gio, Pango
from senf import uri2fsn, fsnative, fsn2text, bytes2fsn

from quodlibet import formats, print_d
from quodlibet import qltk
from quodlibet import _

from quodlibet.util import windows
from quodlibet.qltk.getstring import GetStringDialog
from quodlibet.qltk.views import AllTreeView, RCMHintedTreeView, \
    MultiDragTreeView
from quodlibet.qltk.views import TreeViewColumn
from quodlibet.qltk.x import ScrolledWindow, Paned
from quodlibet.qltk.models import ObjectStore, ObjectTreeStore
from quodlibet.qltk import Icons
from quodlibet.util.path import listdir, \
    glib2fsn, xdg_get_user_dirs, get_home_dir, xdg_get_config_home
from quodlibet.util import connect_obj


def search_func(model, column, key, iter_, handledirs):
    check = model.get_value(iter_, 0)
    if check is None:
        return True
    elif not handledirs or os.sep not in key:
        check = os.path.basename(check) or os.sep
    return key not in check.lower() and key not in check


def is_image(filename):
    IMAGES = [".jpg", ".png", ".jpeg"]
    for ext in IMAGES:
        if filename.lower().endswith(ext):
            return True
    return False


def filesel_filter(filename):
    if formats.filter(filename):
        return True
    else:
        return is_image(filename)


def _get_win_favorites():
    """Returns a list of paths for commonly used directories.

    e.g. My Music, Desktop etc.
    """

    assert os.name == "nt"

    folders = []

    funcs = [windows.get_desktop_dir, windows.get_personal_dir,
             windows.get_music_dir]

    for func in funcs:
        path = func()
        if path is not None:
            folders.append(path)

    # try to extract the favorites listed in explorer and add them
    # if not already present
    links = windows.get_links_dir()
    if links is not None:
        try:
            link_entries = os.listdir(links)
        except OSError:
            link_entries = []

        for entry in link_entries:
            if entry.endswith(".lnk"):
                try:
                    target = windows.get_link_target(
                        os.path.join(links, entry))
                except WindowsError:
                    pass
                else:
                    if target:
                        # RecentPlaces.lnk resolves
                        # to an empty string for example
                        folders.append(target)

    # remove duplicated entries
    filtered = []
    for path in folders:
        if path not in filtered:
            filtered.append(path)

    return filtered


def get_favorites():
    """A list of paths of commonly used folders (Desktop,..)

    Paths don't have to exist.
    """

    if os.name == "nt":
        return _get_win_favorites()
    else:
        paths = [get_home_dir()]

        xfg_user_dirs = xdg_get_user_dirs()
        for key in ["XDG_DESKTOP_DIR", "XDG_DOWNLOAD_DIR", "XDG_MUSIC_DIR"]:
            if key in xfg_user_dirs:
                path = xfg_user_dirs[key]
                if path not in paths:
                    paths.append(path)

        return paths


def _get_win_drives():
    """Returns a list of paths for all available drives e.g. ['C:\\']"""

    assert os.name == "nt"
    drives = [letter + u":\\" for letter in u"CDEFGHIJKLMNOPQRSTUVWXYZ"]
    return [d for d in drives if os.path.isdir(d)]


def get_drives():
    """A list of accessible drives"""

    if os.name == "nt":
        return _get_win_drives()
    else:
        paths = []
        for mount in Gio.VolumeMonitor.get().get_mounts():
            path = mount.get_root().get_path()
            if path is not None:
                paths.append(glib2fsn(path))
        paths.append("/")
        return paths


def parse_gtk_bookmarks(data):
    """
    Args:
        data (bytes)
    Retruns:
        List[fsnative]
    Raises:
        ValueError
    """

    assert isinstance(data, bytes)

    paths = []
    for line in data.splitlines():
        parts = line.split()
        if not parts:
            continue
        folder_url = parts[0]
        paths.append(bytes2fsn(urlsplit(folder_url)[2], "utf-8"))
    return paths


def get_gtk_bookmarks():
    """A list of paths from the GTK+ bookmarks.
    The paths don't have to exist.

    Returns:
        List[fsnative]
    """

    if os.name == "nt":
        return []

    path = os.path.join(xdg_get_config_home(), "gtk-3.0", "bookmarks")
    folders = []
    try:
        with open(path, "rb") as f:
            folders = parse_gtk_bookmarks(f.read())
    except (EnvironmentError, ValueError):
        pass

    return folders


class DirectoryTree(RCMHintedTreeView, MultiDragTreeView):
    """A tree view showing multiple folder hierarchies"""

    def __init__(self, initial=None, folders=None):
        """
        initial -- the path to select/scroll to
        folders -- a list of paths to show in the tree view, None
                   will result in a separator.
        """

        model = ObjectTreeStore()
        super(DirectoryTree, self).__init__(model=model)

        if initial is not None:
            assert isinstance(initial, fsnative)

        column = TreeViewColumn(title=_("Folders"))
        column.set_sizing(Gtk.TreeViewColumnSizing.AUTOSIZE)
        render = Gtk.CellRendererPixbuf()
        render.set_property('icon-name', Icons.FOLDER)
        render.props.xpad = 3
        column.pack_start(render, False)
        render = Gtk.CellRendererText()
        if self.supports_hints():
            render.set_property('ellipsize', Pango.EllipsizeMode.END)
        column.pack_start(render, True)

        def cell_data(column, cell, model, iter_, userdata):
            value = model.get_value(iter_)
            if value is not None:
                text = fsn2text(os.path.basename(value) or value)
                cell.set_property('text', text)

        column.set_cell_data_func(render, cell_data)

        self.append_column(column)
        self.set_search_equal_func(search_func, True)
        self.set_search_column(0)

        if folders is None:
            folders = []

        for path in folders:
            niter = model.append(None, [path])
            if path is not None:
                assert isinstance(path, fsnative)
                model.append(niter, [fsnative(u"dummy")])

        self.get_selection().set_mode(Gtk.SelectionMode.MULTIPLE)
        self.connect(
            'test-expand-row', DirectoryTree.__expanded, model)

        self.set_row_separator_func(
            lambda model, iter_, data: model.get_value(iter_) is None, None)

        if initial:
            self.go_to(initial)

        menu = self._create_menu()
        connect_obj(self, 'popup-menu', self._popup_menu, menu)

        # Allow to drag and drop files from outside
        targets = [
            ("text/uri-list", 0, 42)
        ]
        targets = [Gtk.TargetEntry.new(*t) for t in targets]
        self.drag_dest_set(Gtk.DestDefaults.ALL, targets, Gdk.DragAction.COPY)
        self.connect('drag-data-received', self.__drag_data_received)

    def _create_menu(self):
        menu = Gtk.Menu()
        m = qltk.MenuItem(_(u"_New Folder…"), Icons.DOCUMENT_NEW)
        m.connect('activate', self.__mkdir)
        menu.append(m)
        m = qltk.MenuItem(_("_Delete"), Icons.EDIT_DELETE)
        m.connect('activate', self.__rmdir)
        menu.append(m)
        m = qltk.MenuItem(_("_Refresh"), Icons.VIEW_REFRESH)
        m.connect('activate', self.__refresh)
        menu.append(m)
        m = qltk.MenuItem(_("_Select all Sub-Folders"), Icons.FOLDER)
        m.connect('activate', self.__expand)
        menu.append(m)
        menu.show_all()
        return menu

    def get_selected_paths(self):
        """A list of fs paths"""

        selection = self.get_selection()
        model, paths = selection.get_selected_rows()
        return [model[p][0] for p in paths]

    def go_to(self, path_to_go):
        assert isinstance(path_to_go, fsnative)

        # The path should be normalized in normal situations.
        # On some systems and special environments (pipenv) there might be
        # a non-normalized path at least during tests, though.
        path_to_go = os.path.normpath(path_to_go)

        model = self.get_model()

        # Find the top level row which has the largest common
        # path with the path we want to go to
        roots = dict([(p, i) for (i, p) in model.iterrows(None)])
        head, tail = path_to_go, fsnative(u"")
        to_find = []
        while head and head not in roots:
            new_head, tail = os.path.split(head)
            # this can happen for invalid paths on Windows
            if head == new_head:
                break
            head = new_head
            to_find.append(tail)
        if head not in roots:
            return
        start_iter = roots[head]

        # expand until we find the right directory or the last valid one
        # and select/scroll to it
        def search(view, model, iter_, to_find):
            tree_path = model.get_path(iter_)

            # we are where we want, select and scroll
            if not to_find:
                view.set_cursor(tree_path)
                view.scroll_to_cell(tree_path)
                return

            # expand the row
            view.expand_row(tree_path, False)

            next_ = to_find.pop(-1)
            for sub_iter, path in model.iterrows(iter_):
                if os.path.basename(path) == next_:
                    search(view, model, sub_iter, to_find)
                    break
            else:
                # we haven't found the right sub folder, select the parent
                # and stop
                search(view, model, iter_, [])

        search(self, model, start_iter, to_find)

    def __drag_data_received(self, widget, drag_ctx, x, y, data, info, time):
        if info == 42:
            uris = data.get_uris()
            if uris:
                try:
                    filename = uri2fsn(uris[0])
                except ValueError:
                    pass
                else:
                    self.go_to(filename)
                    Gtk.drag_finish(drag_ctx, True, False, time)
                    return
        Gtk.drag_finish(drag_ctx, False, False, time)

    def _popup_menu(self, menu):
        model, paths = self.get_selection().get_selected_rows()

        directories = [model[path][0] for path in paths]
        menu_items = menu.get_children()
        delete = menu_items[1]
        try:
            is_empty = not any(len(os.listdir(d)) for d in directories)
            delete.set_sensitive(is_empty)
        except OSError as err:
            if err.errno == errno.ENOENT:
                model.remove(model.get_iter(paths[0]))
            return False
        new_folder = menu_items[0]
        new_folder.set_sensitive(len(paths) == 1)

        selection = self.get_selection()
        selection.unselect_all()
        for path in paths:
            selection.select_path(path)
        return self.popup_menu(menu, 0, Gtk.get_current_event_time())

    def __mkdir(self, button):
        model, paths = self.get_selection().get_selected_rows()
        if len(paths) != 1:
            return

        path = paths[0]
        directory = model[path][0]

        dir_ = GetStringDialog(
            None, _("New Folder"), _("Enter a name for the new folder:")).run()

        if not dir_:
            return

        dir_ = glib2fsn(dir_)
        fullpath = os.path.realpath(os.path.join(directory, dir_))

        try:
            os.makedirs(fullpath)
        except EnvironmentError as err:
            error = "<b>%s</b>: %s" % (err.filename, err.strerror)
            qltk.ErrorMessage(
                None, _("Unable to create folder"), error).run()
            return

        self.emit('test-expand-row', model.get_iter(path), path)
        self.expand_row(path, False)

    def __rmdir(self, button):
        model, paths = self.get_selection().get_selected_rows()

        directories = [model[path][0] for path in paths]
        print_d("Deleting %d empty directories" % len(directories))
        for directory in directories:
            try:
                os.rmdir(directory)
            except EnvironmentError as err:
                error = "<b>%s</b>: %s" % (err.filename, err.strerror)
                qltk.ErrorMessage(
                    None, _("Unable to delete folder"), error).run()
                return

        ppath = Gtk.TreePath(paths[0][:-1])
        expanded = self.row_expanded(ppath)
        self.emit('test-expand-row', model.get_iter(ppath), ppath)
        if expanded:
            self.expand_row(ppath, False)

    def __expand(self, button):
        selection = self.get_selection()
        model, paths = selection.get_selected_rows()

        for path in paths:
            iter_ = model.get_iter(path)
            self.expand_row(path, False)
            last = self.__select_children(iter_, model, selection)
            selection.select_range(path, last)

    def __select_children(self, iter_, model, selection):
        nchildren = model.iter_n_children(iter_)
        last = model.get_path(iter_)

        for i in range(nchildren):
            child = model.iter_nth_child(iter_, i)
            self.expand_row(model.get_path(child), False)
            last = self.__select_children(child, model, selection)
        return last

    def __refresh(self, button):
        model, rows = self.get_selection().get_selected_rows()
        expanded = set()
        self.map_expanded_rows(
            lambda s, iter, data: expanded.add(model[iter][0]), None)
        needs_expanding = []
        for row in rows:
            if self.row_expanded(row):
                self.emit('test-expand-row', model.get_iter(row), row)
                self.expand_row(row, False)
                needs_expanding.append(row)
        while len(needs_expanding) > 0:
            child = model.iter_children(model.get_iter(needs_expanding.pop()))
            while child is not None:
                if model[child][0] in expanded:
                    path = model.get_path(child)
                    self.emit('test-expand-row', child, path)
                    self.expand_row(path, False)
                    needs_expanding.append(path)
                child = model.iter_next(child)

    def __expanded(self, iter, path, model):
        window = self.get_window()
        if window:
            window.set_cursor(Gdk.Cursor.new(Gdk.CursorType.WATCH))
            Gtk.main_iteration_do(False)
        try:
            try:
                if model is None:
                    return
                while model.iter_has_child(iter):
                    model.remove(model.iter_children(iter))
                folder = model[iter][0]
                for path in listdir(folder):
                    try:
                        if not os.path.isdir(path):
                            continue
                        for filename in listdir(path):
                            if os.path.isdir(filename):
                                niter = model.append(iter, [path])
                                model.append(niter, ["dummy"])
                                break
                        else:
                            model.append(iter, [path])
                    except OSError:
                        pass
                if not model.iter_has_child(iter):
                    return True
            except OSError:
                pass
        finally:
            if window:
                window.set_cursor(None)


class FileSelector(Paned):
    """A file selector widget consisting of a folder tree
    and a file list below.
    """

    __gsignals__ = {
        'changed': (GObject.SignalFlags.RUN_LAST, None,
                    (Gtk.TreeSelection,))
    }

    def __init__(self, initial=None, filter=filesel_filter, folders=None):
        """
        initial -- a path to a file which should be shown initially
        filter -- a function which filters paths shown in the file list
        folders -- list of shown folders in the directory tree
        """

        super(FileSelector, self).__init__(
            orientation=Gtk.Orientation.VERTICAL)
        self.__filter = filter

        if initial is not None:
            assert isinstance(initial, fsnative)

        if initial and os.path.isfile(initial):
            initial = os.path.dirname(initial)
        dirlist = DirectoryTree(initial, folders=folders)

        model = ObjectStore()
        filelist = AllTreeView(model=model)
        filelist.connect("draw", self.__restore_scroll_pos_on_draw)

        column = TreeViewColumn(title=_("Songs"))
        column.set_sizing(Gtk.TreeViewColumnSizing.AUTOSIZE)
        render = Gtk.CellRendererPixbuf()
        render.props.xpad = 3

        def cell_icon(column, cell, model, iter_, userdata):
            value = model.get_value(iter_)
            if is_image(value):
                cell.set_property('icon-name', Icons.IMAGE_X_GENERIC)
            else:
                cell.set_property('icon-name', Icons.AUDIO_X_GENERIC)

        column.set_cell_data_func(render, cell_icon)

        column.pack_start(render, False)
        render = Gtk.CellRendererText()
        if filelist.supports_hints():
            render.set_property('ellipsize', Pango.EllipsizeMode.END)
        column.pack_start(render, True)

        def cell_data(column, cell, model, iter_, userdata):
            value = model.get_value(iter_)
            cell.set_property('text', fsn2text(os.path.basename(value)))

        column.set_cell_data_func(render, cell_data)

        filelist.append_column(column)
        filelist.set_rules_hint(True)
        filelist.get_selection().set_mode(Gtk.SelectionMode.MULTIPLE)
        filelist.set_search_equal_func(search_func, False)
        filelist.set_search_column(0)

        self.__sig = filelist.get_selection().connect(
            'changed', self.__changed)

        dirlist.get_selection().connect(
            'changed', self.__dir_selection_changed, filelist)
        dirlist.get_selection().emit('changed')

        def select_all_files(view, path, col, fileselection):
            view.expand_row(path, False)
            fileselection.select_all()
        dirlist.connect('row-activated', select_all_files,
            filelist.get_selection())

        sw = ScrolledWindow()
        sw.add(dirlist)
        sw.set_policy(Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.AUTOMATIC)
        sw.set_shadow_type(Gtk.ShadowType.IN)
        self.pack1(sw, resize=True)

        sw = ScrolledWindow()
        sw.add(filelist)
        sw.set_policy(Gtk.PolicyType.AUTOMATIC, Gtk.PolicyType.AUTOMATIC)
        sw.set_shadow_type(Gtk.ShadowType.IN)
        self.pack2(sw, resize=True)

    def go_to(self, *args, **kwargs):
        dirlist = self.get_child1().get_child()
        dirlist.go_to(*args, **kwargs)

    def get_selected_paths(self):
        """A list of fs paths"""

        filelist = self.get_child2().get_child()
        selection = filelist.get_selection()
        model, paths = selection.get_selected_rows()
        return [model[p][0] for p in paths]

    def rescan(self):
        """Refill the file list for the current directory selection"""

        dirlist = self.get_child1().get_child()
        filelist = self.get_child2().get_child()

        dir_selection = dirlist.get_selection()
        self.__dir_selection_changed(dir_selection, filelist)

    def __changed(self, selection):
        # forward file list selection changed signals
        self.emit('changed', selection)

    def __dir_selection_changed(self, selection, filelist):
        # dir selection changed, refill the file list

        fselect = filelist.get_selection()
        fselect.handler_block(self.__sig)
        fmodel, frows = fselect.get_selected_rows()
        selected = [fmodel[row][0] for row in frows]

        fmodel = filelist.get_model()
        fmodel.clear()
        dmodel, rows = selection.get_selected_rows()
        dirs = [dmodel[row][0] for row in rows]
        for dir_ in dirs:
            try:
                files = filter(self.__filter, listdir(dir_))
                for file_ in sorted(files):
                    filename = os.path.join(dir_, file_)
                    if (os.access(filename, os.R_OK) and
                            not os.path.isdir(filename)):
                        fmodel.append([filename])
            except OSError:
                pass

        for iter_, filename in fmodel.iterrows():
            if filename in selected:
                fselect.select_iter(iter_)

        fselect.handler_unblock(self.__sig)
        fselect.emit('changed')
        self._saved_scroll_pos = filelist.get_vadjustment().get_value()

    def __restore_scroll_pos_on_draw(self, treeview, context):
        if self._saved_scroll_pos:
            vadj = treeview.get_vadjustment()
            vadj.set_value(self._saved_scroll_pos)
            self._saved_scroll_pos = None


def _get_main_folders():

    def filter_exists(paths):
        return [p for p in paths if os.path.isdir(p)]

    folders = []

    favs = filter_exists(get_favorites())
    if favs:
        folders += favs

    drives = filter_exists(get_drives())
    if folders and drives:
        folders += [None]
    if drives:
        folders += drives

    bookmarks = filter_exists(get_gtk_bookmarks())
    if folders and bookmarks:
        folders += [None]
    if bookmarks:
        folders += bookmarks

    return folders


class MainFileSelector(FileSelector):
    """The main file selector used in EF.

    Shows a useful list of directories in the directory tree.
    """

    def __init__(self, initial=None):
        folders = _get_main_folders()
        super(MainFileSelector, self).__init__(
            initial, filesel_filter, folders=folders)


class MainDirectoryTree(DirectoryTree):
    """The main directory tree used in QL.

    Shows a useful list of directories.
    """

    def __init__(self, initial=None, folders=None):
        if folders is None:
            folders = []

        main = _get_main_folders()
        if folders and main:
            folders += [None]
        if main:
            folders += main

        super(MainDirectoryTree, self).__init__(
            initial=initial, folders=folders)
