from __future__ import annotations

from dataclasses import dataclass
from typing import Generic, TypeVar, Union, cast

import weechat

from slack.api import SlackWorkspace
from slack.log import print_error
from slack.shared import shared
from slack.util import get_callback_name


class WeeChatColor(str):
    pass


@dataclass
class WeeChatConfig:
    name: str

    def __post_init__(self):
        self.pointer = weechat.config_new(self.name, "", "")


@dataclass
class WeeChatSection:
    weechat_config: WeeChatConfig
    name: str
    user_can_add_options: bool = False
    user_can_delete_options: bool = False
    callback_read: str = ""
    callback_write: str = ""

    def __post_init__(self):
        self.pointer = weechat.config_new_section(
            self.weechat_config.pointer,
            self.name,
            self.user_can_add_options,
            self.user_can_delete_options,
            self.callback_read,
            "",
            self.callback_write,
            "",
            "",
            "",
            "",
            "",
            "",
            "",
        )


WeeChatOptionType = TypeVar("WeeChatOptionType", bound=Union[int, str])


@dataclass
class WeeChatOption(Generic[WeeChatOptionType]):
    section: WeeChatSection
    name: str
    description: str
    default_value: WeeChatOptionType
    min_value: Union[int, None] = None
    max_value: Union[int, None] = None
    string_values: Union[str, None] = None
    parent_option: Union[WeeChatOption[WeeChatOptionType], None] = None

    def __post_init__(self):
        self._pointer = self._create_weechat_option()

    @property
    def value(self) -> WeeChatOptionType:
        if weechat.config_option_is_null(self._pointer):
            if self.parent_option:
                return self.parent_option.value
            return self.default_value

        if isinstance(self.default_value, bool):
            return cast(WeeChatOptionType, weechat.config_boolean(self._pointer) == 1)
        if isinstance(self.default_value, int):
            return cast(WeeChatOptionType, weechat.config_integer(self._pointer))
        if isinstance(self.default_value, WeeChatColor):
            color = weechat.config_color(self._pointer)
            return cast(WeeChatOptionType, WeeChatColor(color))
        return cast(WeeChatOptionType, weechat.config_string(self._pointer))

    @value.setter
    def value(self, value: WeeChatOptionType):
        rc = self.value_set_as_str(str(value))
        if rc == weechat.WEECHAT_CONFIG_OPTION_SET_ERROR:
            raise Exception(f"Failed to value for option: {self.name}")

    def value_set_as_str(self, value: str) -> int:
        return weechat.config_option_set(self._pointer, value, 1)

    def value_set_null(self) -> int:
        if not self.parent_option:
            raise Exception(
                f"Can't set null value for option without parent: {self.name}"
            )
        return weechat.config_option_set_null(self._pointer, 1)

    @property
    def weechat_type(self) -> str:
        if self.string_values:
            return "integer"
        if isinstance(self.default_value, bool):
            return "boolean"
        if isinstance(self.default_value, int):
            return "integer"
        if isinstance(self.default_value, WeeChatColor):
            return "color"
        return "string"

    def _create_weechat_option(self) -> str:
        if self.parent_option:
            parent_option_name = (
                f"{self.parent_option.section.weechat_config.name}"
                f".{self.parent_option.section.name}"
                f".{self.parent_option.name}"
            )
            name = f"{self.name} << {parent_option_name}"
            default_value = None
            null_value_allowed = True
        else:
            name = self.name
            default_value = str(self.default_value)
            null_value_allowed = False

        value = None

        if shared.weechat_version < 0x3050000:
            default_value = str(self.default_value)
            value = default_value

        return weechat.config_new_option(
            self.section.weechat_config.pointer,
            self.section.pointer,
            name,
            self.weechat_type,
            self.description,
            self.string_values or "",
            self.min_value or -(2**31),
            self.max_value or 2**31 - 1,
            default_value,
            value,
            null_value_allowed,
            "",
            "",
            "",
            "",
            "",
            "",
        )


class SlackConfigSectionColor:
    def __init__(self, weechat_config: WeeChatConfig):
        self._section = WeeChatSection(weechat_config, "color")

        self.reaction_suffix = WeeChatOption(
            self._section,
            "reaction_suffix",
            "Color to use for the [:wave:(@user)] suffix on messages that have "
            "reactions attached to them.",
            WeeChatColor("darkgray"),
        )


class SlackConfigSectionWorkspace:
    def __init__(
        self,
        section: WeeChatSection,
        workspace_name: Union[str, None],
        parent_config: Union[SlackConfigSectionWorkspace, None],
    ):
        self._section = section
        self._workspace_name = workspace_name
        self._parent_config = parent_config

        self.api_token = self._create_option(
            "api_token",
            "",
            "",
        )

        self.api_cookies = self._create_option(
            "api_cookies",
            "",
            "",
        )

        self.autoconnect = self._create_option(
            "autoconnect",
            "automatically connect to workspace when WeeChat is starting",
            False,
        )

        self.slack_timeout = self._create_option(
            "slack_timeout",
            "timeout (in seconds) for network requests",
            30,
        )

    def _create_option(
        self,
        name: str,
        description: str,
        default_value: WeeChatOptionType,
        min_value: Union[int, None] = None,
        max_value: Union[int, None] = None,
        string_values: Union[str, None] = None,
    ) -> WeeChatOption[WeeChatOptionType]:
        if self._workspace_name:
            option_name = f"{self._workspace_name}.{name}"
        else:
            option_name = name

        if self._parent_config:
            parent_option = getattr(self._parent_config, name, None)
        else:
            parent_option = None

        return WeeChatOption(
            self._section,
            option_name,
            description,
            default_value,
            min_value,
            max_value,
            string_values,
            parent_option,
        )


def config_section_workspace_read_cb(
    data: str, config_file: str, section: str, option_name: str, value: Union[str, None]
) -> int:
    option_split = option_name.split(".", 1)
    if len(option_split) < 2:
        return weechat.WEECHAT_CONFIG_OPTION_SET_ERROR
    workspace_name, name = option_split
    if not workspace_name or not name:
        return weechat.WEECHAT_CONFIG_OPTION_SET_ERROR

    if workspace_name not in shared.workspaces:
        shared.workspaces[workspace_name] = SlackWorkspace(workspace_name)

    option = getattr(shared.workspaces[workspace_name].config, name, None)
    if option is None:
        return weechat.WEECHAT_CONFIG_OPTION_SET_OPTION_NOT_FOUND
    if not isinstance(option, WeeChatOption):
        return weechat.WEECHAT_CONFIG_OPTION_SET_ERROR

    if value is None or (
        shared.weechat_version < 0x3080000
        and value == ""
        and option.weechat_type != "string"
    ):
        rc = option.value_set_null()
    else:
        rc = option.value_set_as_str(value)
    if rc == weechat.WEECHAT_CONFIG_OPTION_SET_ERROR:
        print_error(f'error creating workspace option "{option_name}"')
    return rc


def config_section_workspace_write_for_old_weechat_cb(
    data: str, config_file: str, section_name: str
) -> int:
    if not weechat.config_write_line(config_file, section_name, ""):
        return weechat.WEECHAT_CONFIG_WRITE_ERROR

    for workspace in shared.workspaces.values():
        for option in vars(workspace.config).values():
            if isinstance(option, WeeChatOption):
                if (
                    option.weechat_type != "string"
                    or not weechat.config_option_is_null(
                        option._pointer  # pyright: ignore [reportPrivateUsage]
                    )
                ):
                    if not weechat.config_write_option(
                        config_file,
                        option._pointer,  # pyright: ignore [reportPrivateUsage]
                    ):
                        return weechat.WEECHAT_CONFIG_WRITE_ERROR

    return weechat.WEECHAT_CONFIG_WRITE_OK


class SlackConfig:
    def __init__(self):
        self.weechat_config = WeeChatConfig("slack")
        self.color = SlackConfigSectionColor(self.weechat_config)
        self._section_workspace_default = WeeChatSection(
            self.weechat_config, "workspace_default"
        )
        # WeeChat < 3.8 sends null as an empty string to callback_read, so in
        # order to distinguish them, don't write the null values to the config
        # See https://github.com/weechat/weechat/pull/1843
        callback_write = (
            get_callback_name(config_section_workspace_write_for_old_weechat_cb)
            if shared.weechat_version < 0x3080000
            else ""
        )
        self._section_workspace = WeeChatSection(
            self.weechat_config,
            "workspace",
            callback_read=get_callback_name(config_section_workspace_read_cb),
            callback_write=callback_write,
        )
        self._workspace_default = SlackConfigSectionWorkspace(
            self._section_workspace_default, None, None
        )

    def config_read(self):
        weechat.config_read(self.weechat_config.pointer)

    def create_workspace_config(self, workspace_name: str):
        if workspace_name in shared.workspaces:
            raise Exception(
                f"Failed to create workspace config, already exists: {workspace_name}"
            )
        return SlackConfigSectionWorkspace(
            self._section_workspace, workspace_name, self._workspace_default
        )