#-----------------------------------------------------------------------------
# Copyright (c) 2012 - 2021, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
#-----------------------------------------------------------------------------

#-----------------------------------------------------------------------------
# Boilerplate
#-----------------------------------------------------------------------------
from __future__ import annotations

import logging # isort:skip
log = logging.getLogger(__name__)

#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------

# Standard library imports
import itertools
import re
import warnings
from dataclasses import dataclass
from typing import (
    Any,
    Callable,
    Dict,
    Iterator,
    List,
    Sequence,
    Tuple,
    Union,
    cast,
)

# External imports
from typing_extensions import Literal

# Bokeh imports
from ..models import (
    HoverTool,
    Plot,
    Tool,
    Toolbar,
)
from ..models.tools import (
    Drag,
    GestureTool,
    InspectTool,
    Scroll,
    Tap,
)

#-----------------------------------------------------------------------------
# Globals and constants
#-----------------------------------------------------------------------------

__all__ = (
    'process_active_tools',
    'process_tools_arg',
)

#-----------------------------------------------------------------------------
# General API
#-----------------------------------------------------------------------------

#-----------------------------------------------------------------------------
# Dev API
#-----------------------------------------------------------------------------

# TODO: str should be literal union of e.g. pan | xpan | ypan
Auto = Literal["auto"]
ActiveDrag = Union[Drag, Auto, str, None]
ActiveInspect = Union[List[InspectTool], InspectTool, Auto, str, None]
ActiveScroll = Union[Scroll, Auto, str, None]
ActiveTap = Union[Tap, Auto, str, None]
ActiveMulti = Union[GestureTool, Auto, str, None]

def process_active_tools(toolbar: Toolbar, tool_map: Dict[str, Tool],
        active_drag: ActiveDrag, active_inspect: ActiveInspect, active_scroll: ActiveScroll,
        active_tap: ActiveTap, active_multi: ActiveMulti) -> None:
    """ Adds tools to the plot object

    Args:
        toolbar (Toolbar): instance of a Toolbar object
        tools_map (dict[str]): tool_map from _process_tools_arg
        active_drag (str, None, "auto" or Tool): the tool to set active for drag
        active_inspect (str, None, "auto", Tool or Tool[]): the tool to set active for inspect
        active_scroll (str, None, "auto" or Tool): the tool to set active for scroll
        active_tap (str, None, "auto" or Tool): the tool to set active for tap
        active_multi (str, None, "auto" or Tool): the tool to set active for tap

    Returns:
        None

    Note:
        This function sets properties on Toolbar
    """
    if active_drag in ["auto", None] or isinstance(active_drag, Tool):
        toolbar.active_drag = cast(Any, active_drag)
    elif active_drag in tool_map:
        toolbar.active_drag = cast(Any, tool_map[active_drag])
    else:
        raise ValueError(f"Got unknown {active_drag!r} for 'active_drag', which was not a string supplied in 'tools' argument")

    if active_inspect in ["auto", None] or isinstance(active_inspect, Tool) or \
            (isinstance(active_inspect, list) and all(isinstance(t, Tool) for t in active_inspect)):
        toolbar.active_inspect = cast(Any, active_inspect)
    elif isinstance(active_inspect, str) and active_inspect in tool_map:
        toolbar.active_inspect = cast(Any, tool_map[active_inspect])
    else:
        raise ValueError(f"Got unknown {active_inspect!r} for 'active_inspect', which was not a string supplied in 'tools' argument")

    if active_scroll in ["auto", None] or isinstance(active_scroll, Tool):
        toolbar.active_scroll = cast(Any, active_scroll)
    elif active_scroll in tool_map:
        toolbar.active_scroll = cast(Any, tool_map[active_scroll])
    else:
        raise ValueError(f"Got unknown {active_scroll!r} for 'active_scroll', which was not a string supplied in 'tools' argument")

    if active_tap in ["auto", None] or isinstance(active_tap, Tool):
        toolbar.active_tap = cast(Any, active_tap)
    elif active_tap in tool_map:
        toolbar.active_tap = cast(Any, tool_map[active_tap])
    else:
        raise ValueError(f"Got unknown {active_tap!r} for 'active_tap', which was not a string supplied in 'tools' argument")

    if active_multi in ["auto", None] or isinstance(active_multi, Tool):
        toolbar.active_multi = cast(Any, active_multi)
    elif active_multi in tool_map:
        toolbar.active_multi = cast(Any, tool_map[active_multi])
    else:
        raise ValueError(f"Got unknown {active_multi!r} for 'active_multi', which was not a string supplied in 'tools' argument")

def process_tools_arg(plot: Plot, tools: str | Sequence[Tool | str],
        tooltips: str | Tuple[str, str] | None = None) -> Tuple[List[Tool], Dict[str, Tool]]:
    """ Adds tools to the plot object

    Args:
        plot (Plot): instance of a plot object

        tools (seq[Tool or str]|str): list of tool types or string listing the
            tool names. Those are converted using the to actual Tool instances.

        tooltips (string or seq[tuple[str, str]], optional):
            tooltips to use to configure a HoverTool

    Returns:
        list of Tools objects added to plot, map of supplied string names to tools
    """
    tool_objs, tool_map = _resolve_tools(tools)

    repeated_tools = [ str(obj) for obj in _collect_repeated_tools(tool_objs) ]
    if repeated_tools:
        warnings.warn(f"{','.join(repeated_tools)} are being repeated")

    if tooltips is not None:
        for tool_obj in tool_objs:
            if isinstance(tool_obj, HoverTool):
                tool_obj.tooltips = tooltips # type: ignore
                break
        else:
            tool_objs.append(HoverTool(tooltips=tooltips))

    return tool_objs, tool_map

#-----------------------------------------------------------------------------
# Private API
#-----------------------------------------------------------------------------

def _resolve_tools(tools: str | Sequence[Tool | str]) -> Tuple[List[Tool], Dict[str, Tool]]:
    tool_objs: List[Tool] = []
    tool_map: Dict[str, Tool] = {}

    if not isinstance(tools, str):
        temp_tool_str = ""
        for tool in tools:
            if isinstance(tool, Tool):
                tool_objs.append(tool)
            elif isinstance(tool, str):
                temp_tool_str += tool + ','
            else:
                raise ValueError("tool should be a string or an instance of Tool class")
        tools = temp_tool_str

    for tool in re.split(r"\s*,\s*", tools.strip()):
        # re.split will return empty strings; ignore them.
        if tool == "":
            continue

        tool_obj = Tool.from_string(tool)
        tool_objs.append(tool_obj)
        tool_map[tool] = tool_obj

    return tool_objs, tool_map

def _collect_repeated_tools(tool_objs: List[Tool]) -> Iterator[Tool]:
    @dataclass
    class Item:
        obj: Tool
        properties: Dict[str, Any]

    key: Callable[[Tool], str] = lambda obj: obj.__class__.__name__

    for _, group in itertools.groupby(sorted(tool_objs, key=key), key=key):
        rest = [ Item(obj, obj.properties_with_values()) for obj in group ]
        while len(rest) > 1:
            head, *rest = rest
            for item in rest:
                if item.properties == head.properties:
                    yield item.obj

#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------