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# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
from libqtile.layout.base import Layout, _ClientList


class _Column(_ClientList):

    # shortcuts for current client and index used in Columns layout
    cw = _ClientList.current_client
    current = _ClientList.current_index

    def __init__(self, split, insert_position, width=100):
        _ClientList.__init__(self)
        self.width = width
        self.split = split
        self.insert_position = insert_position
        self.heights = {}

    def info(self):
        info = _ClientList.info(self)
        info.update(
            dict(
                heights=[self.heights[c] for c in self.clients],
                split=self.split,
            ))
        return info

    def toggle_split(self):
        self.split = not self.split

    def add(self, client, height=100):
        _ClientList.add(self, client, self.insert_position)
        self.heights[client] = height
        delta = 100 - height
        if delta != 0:
            n = len(self)
            growth = [int(delta / n)] * n
            growth[0] += delta - sum(growth)
            for c, g in zip(self, growth):
                self.heights[c] += g

    def remove(self, client):
        _ClientList.remove(self, client)
        delta = self.heights[client] - 100
        del self.heights[client]
        if delta != 0:
            n = len(self)
            growth = [int(delta / n)] * n
            growth[0] += delta - sum(growth)
            for c, g in zip(self, growth):
                self.heights[c] += g

    def __str__(self):
        cur = self.current
        return "_Column: " + ", ".join([
            "[%s: %d]" % (c.name, self.heights[c])
            if c == cur else "%s: %d" % (c.name, self.heights[c])
            for c in self.clients
        ])


class Columns(Layout):
    """Extension of the Stack layout.

    The screen is split into columns, which can be dynamically added or
    removed.  Each column can present its windows in 2 modes: split or
    stacked.  In split mode, all windows are presented simultaneously,
    spliting the column space.  In stacked mode, only a single window is
    presented from the stack of windows.  Columns and windows can be
    resized and windows can be shuffled around.

    This layout can also emulate wmii's default layout via:

        layout.Columns(num_columns=1, insert_position=1)

    Or the "Vertical", and "Max", depending on the default parameters.

    An example key configuration is::

        Key([mod], "j", lazy.layout.down()),
        Key([mod], "k", lazy.layout.up()),
        Key([mod], "h", lazy.layout.left()),
        Key([mod], "l", lazy.layout.right()),
        Key([mod, "shift"], "j", lazy.layout.shuffle_down()),
        Key([mod, "shift"], "k", lazy.layout.shuffle_up()),
        Key([mod, "shift"], "h", lazy.layout.shuffle_left()),
        Key([mod, "shift"], "l", lazy.layout.shuffle_right()),
        Key([mod, "control"], "j", lazy.layout.grow_down()),
        Key([mod, "control"], "k", lazy.layout.grow_up()),
        Key([mod, "control"], "h", lazy.layout.grow_left()),
        Key([mod, "control"], "l", lazy.layout.grow_right()),
        Key([mod], "Return", lazy.layout.toggle_split()),
        Key([mod], "n", lazy.layout.normalize()),
    """
    defaults = [
        ("name", "columns", "Name of this layout."),
        ("border_focus", "#881111", "Border colour for the focused window."),
        ("border_normal", "#220000", "Border colour for un-focused windows."),
        ("border_focus_stack", "#881111",
         "Border colour for the focused window in stacked columns."),
        ("border_normal_stack", "#220000",
         "Border colour for un-focused windows in stacked columns."),
        ("border_width", 2, "Border width."),
        ("margin", 0, "Margin of the layout."),
        ("split", True, "New columns presentation mode."),
        ("num_columns", 2, "Preferred number of columns."),
        ("grow_amount", 10, "Amount by which to grow a window/column."),
        ("fair", False, "Add new windows to the column with least windows."),
        ("insert_position", 0,
         "Position relative to the current window where new ones are inserted "
         "(0 means right above the current window, 1 means right after)."),
        ("wrap_focus_columns", True,
         "Wrap the screen when moving focus across columns."),
        ("wrap_focus_rows", True,
         "Wrap the screen when moving focus across rows."),
        ("wrap_focus_stacks", True,
         "Wrap the screen when moving focus across stacked."),
    ]

    def __init__(self, **config):
        Layout.__init__(self, **config)
        self.add_defaults(Columns.defaults)
        self.columns = [_Column(self.split, self.insert_position)]
        self.current = 0

    def clone(self, group):
        c = Layout.clone(self, group)
        c.columns = [_Column(self.split, self.insert_position)]
        return c

    def info(self):
        d = Layout.info(self)
        d["clients"] = []
        d["columns"] = []
        for c in self.columns:
            cinfo = c.info()
            d["clients"].extend(cinfo['clients'])
            d["columns"].append(cinfo)
        d["current"] = self.current
        return d

    def focus(self, client):
        for i, c in enumerate(self.columns):
            if client in c:
                c.focus(client)
                self.current = i
                break

    @property
    def cc(self):
        return self.columns[self.current]

    def add_column(self, prepend=False):
        c = _Column(self.split, self.insert_position)
        if prepend:
            self.columns.insert(0, c)
            self.current += 1
        else:
            self.columns.append(c)
        return c

    def remove_column(self, col):
        idx = self.columns.index(col)
        del self.columns[idx]
        if idx <= self.current:
            self.current = max(0, self.current - 1)
        delta = col.width - 100
        if delta != 0:
            n = len(self.columns)
            growth = [int(delta / n)] * n
            growth[0] += delta - sum(growth)
            for c, g in zip(self.columns, growth):
                c.width += g

    def add(self, client):
        c = self.cc
        if len(c) > 0 and len(self.columns) < self.num_columns:
            c = self.add_column()
        if self.fair:
            least = min(self.columns, key=len)
            if len(least) < len(c):
                c = least
        self.current = self.columns.index(c)
        c.add(client)

    def remove(self, client):
        remove = None
        for c in self.columns:
            if client in c:
                c.remove(client)
                if len(c) == 0 and len(self.columns) > 1:
                    remove = c
                break
        if remove is not None:
            self.remove_column(c)
        return self.columns[self.current].cw

    def configure(self, client, screen_rect):
        pos = 0
        for col in self.columns:
            if client in col:
                break
            pos += col.width
        else:
            client.hide()
            return
        if client.has_focus:
            color = self.group.qtile.color_pixel(self.border_focus if col.split
                                                 else self.border_focus_stack)
        else:
            color = self.group.qtile.color_pixel(self.border_normal if col.split
                                                 else self.border_normal_stack)
        if len(self.columns) == 1 and (len(col) == 1 or not col.split):
            border = 0
        else:
            border = self.border_width
        width = int(
            0.5 + col.width * screen_rect.width * 0.01 / len(self.columns))
        x = screen_rect.x + int(0.5 + pos * screen_rect.width * 0.01 / len(self.columns))
        if col.split:
            pos = 0
            for c in col:
                if client == c:
                    break
                pos += col.heights[c]
            height = int(
                0.5 + col.heights[client] * screen_rect.height * 0.01 / len(col))
            y = screen_rect.y + int(0.5 + pos * screen_rect.height * 0.01 / len(col))
            client.place(
                x,
                y,
                width - 2 * border,
                height - 2 * border,
                border,
                color,
                margin=self.margin)
            client.unhide()
        elif client == col.cw:
            client.place(
                x,
                screen_rect.y,
                width - 2 * border,
                screen_rect.height - 2 * border,
                border,
                color,
                margin=self.margin)
            client.unhide()
        else:
            client.hide()

    def focus_first(self):
        """Returns first client in first column of layout"""
        if self.columns:
            return self.columns[0].focus_first()

    def focus_last(self):
        """Returns last client in last column of layout"""
        if self.columns:
            return self.columns[-1].focus_last()

    def focus_next(self, win):
        """Returns the next client after 'win' in layout,
           or None if there is no such client"""
        # First: try to get next window in column of win
        for idx, col in enumerate(self.columns):
            if win in col:
                nxt = col.focus_next(win)
                if nxt:
                    return nxt
                else:
                    break
        # if there was no next, get first client from next column
        if idx + 1 < len(self.columns):
            return self.columns[idx + 1].focus_first()

    def focus_previous(self, win):
        """Returns the client previous to 'win' in layout.
           or None if there is no such client"""
        # First: try to focus previous client in column
        for idx, col in enumerate(self.columns):
            if win in col:
                prev = col.focus_previous(win)
                if prev:
                    return prev
                else:
                    break
        # If there was no previous, get last from previous column
        if idx > 0:
            return self.columns[idx - 1].focus_last()

    def cmd_toggle_split(self):
        self.cc.toggle_split()
        self.group.layout_all()

    def cmd_left(self):
        if self.wrap_focus_columns:
            if len(self.columns) > 1:
                self.current = (self.current - 1) % len(self.columns)
        else:
            if self.current > 0:
                self.current = (self.current - 1)
        self.group.focus(self.cc.cw, True)

    def cmd_right(self):
        if self.wrap_focus_columns:
            if len(self.columns) > 1:
                self.current = (self.current + 1) % len(self.columns)
        else:
            if len(self.columns) - 1 > self.current:
                self.current = (self.current + 1)
        self.group.focus(self.cc.cw, True)

    def want_wrap(self, col):
        if col.split:
            return self.wrap_focus_rows
        return self.wrap_focus_stacks

    def cmd_up(self):
        col = self.cc
        if self.want_wrap(col):
            if len(col) > 1:
                col.current_index -= 1
        else:
            if col.current_index > 0:
                col.current_index -= 1
        self.group.focus(col.cw, True)

    def cmd_down(self):
        col = self.cc
        if self.want_wrap(col):
            if len(col) > 1:
                col.current_index += 1
        else:
            if col.current_index < len(col) - 1:
                col.current_index += 1
        self.group.focus(col.cw, True)

    def cmd_next(self):
        if self.cc.split and self.cc.current < len(self.cc) - 1:
            self.cc.current += 1
        elif self.columns:
            self.current = (self.current + 1) % len(self.columns)
            if self.cc.split:
                self.cc.current = 0
        self.group.focus(self.cc.cw, True)

    def cmd_previous(self):
        if self.cc.split and self.cc.current > 0:
            self.cc.current -= 1
        elif self.columns:
            self.current = (self.current - 1) % len(self.columns)
            if self.cc.split:
                self.cc.current = len(self.cc) - 1
        self.group.focus(self.cc.cw, True)

    def cmd_shuffle_left(self):
        cur = self.cc
        client = cur.cw
        if client is None:
            return
        if self.current > 0:
            self.current -= 1
            new = self.cc
            new.add(client, cur.heights[client])
            cur.remove(client)
            if len(cur) == 0:
                self.remove_column(cur)
        elif len(cur) > 1:
            new = self.add_column(True)
            new.add(client, cur.heights[client])
            cur.remove(client)
            self.current = 0
        else:
            return
        self.group.layout_all()

    def cmd_shuffle_right(self):
        cur = self.cc
        client = cur.cw
        if client is None:
            return
        if self.current + 1 < len(self.columns):
            self.current += 1
            new = self.cc
            new.add(client, cur.heights[client])
            cur.remove(client)
            if len(cur) == 0:
                self.remove_column(cur)
        elif len(cur) > 1:
            new = self.add_column()
            new.add(client, cur.heights[client])
            cur.remove(client)
            self.current = len(self.columns) - 1
        else:
            return
        self.group.layout_all()

    def cmd_shuffle_up(self):
        if self.cc.current_index > 0:
            self.cc.shuffle_up()
            self.group.layout_all()

    def cmd_shuffle_down(self):
        if self.cc.current_index + 1 < len(self.cc):
            self.cc.shuffle_down()
            self.group.layout_all()

    def cmd_grow_left(self):
        if self.current > 0:
            if self.columns[self.current - 1].width > self.grow_amount:
                self.columns[self.current - 1].width -= self.grow_amount
                self.cc.width += self.grow_amount
                self.group.layout_all()
        elif len(self.columns) > 1:
            if self.columns[0].width > self.grow_amount:
                self.columns[1].width += self.grow_amount
                self.cc.width -= self.grow_amount
                self.group.layout_all()

    def cmd_grow_right(self):
        if self.current + 1 < len(self.columns):
            if self.columns[self.current + 1].width > self.grow_amount:
                self.columns[self.current + 1].width -= self.grow_amount
                self.cc.width += self.grow_amount
                self.group.layout_all()
        elif len(self.columns) > 1:
            if self.cc.width > self.grow_amount:
                self.cc.width -= self.grow_amount
                self.columns[self.current - 1].width += self.grow_amount
                self.group.layout_all()

    def cmd_grow_up(self):
        col = self.cc
        if col.current > 0:
            if col.heights[col[col.current - 1]] > self.grow_amount:
                col.heights[col[col.current - 1]] -= self.grow_amount
                col.heights[col.cw] += self.grow_amount
                self.group.layout_all()
        elif len(col) > 1:
            if col.heights[col.cw] > self.grow_amount:
                col.heights[col[1]] += self.grow_amount
                col.heights[col.cw] -= self.grow_amount
                self.group.layout_all()

    def cmd_grow_down(self):
        col = self.cc
        if col.current + 1 < len(col):
            if col.heights[col[col.current + 1]] > self.grow_amount:
                col.heights[col[col.current + 1]] -= self.grow_amount
                col.heights[col.cw] += self.grow_amount
                self.group.layout_all()
        elif len(col) > 1:
            if col.heights[col.cw] > self.grow_amount:
                col.heights[col[col.current - 1]] += self.grow_amount
                col.heights[col.cw] -= self.grow_amount
                self.group.layout_all()

    def cmd_normalize(self):
        for col in self.columns:
            for client in col:
                col.heights[client] = 100
            col.width = 100
        self.group.layout_all()
