from __future__ import annotations

import json
import pprint
import re
from dataclasses import dataclass
from functools import wraps
from itertools import chain
from typing import TYPE_CHECKING, Callable, Dict, List, Optional, Tuple, Union

import weechat

from slack.error import SlackError, SlackRtmError, UncaughtError
from slack.log import open_debug_buffer, print_error
from slack.python_compatibility import format_exception, removeprefix, removesuffix
from slack.shared import MESSAGE_ID_REGEX_STRING, REACTION_CHANGE_REGEX_STRING, shared
from slack.slack_buffer import SlackBuffer
from slack.slack_conversation import SlackConversation
from slack.slack_thread import SlackThread
from slack.slack_user import get_user_nick, name_from_user_info
from slack.slack_workspace import SlackWorkspace
from slack.task import run_async, sleep
from slack.util import get_callback_name, with_color
from slack.weechat_config import WeeChatOption, WeeChatOptionTypes

if TYPE_CHECKING:
    from typing_extensions import Literal

    Options = Dict[str, Union[str, Literal[True]]]

REACTION_PREFIX_REGEX_STRING = (
    rf"{MESSAGE_ID_REGEX_STRING}?{REACTION_CHANGE_REGEX_STRING}"
)

commands: Dict[str, Command] = {}


# def parse_help_docstring(cmd):
#     doc = textwrap.dedent(cmd.__doc__).strip().split("\n", 1)
#     cmd_line = doc[0].split(None, 1)
#     args = "".join(cmd_line[1:])
#     return cmd_line[0], args, doc[1].strip()


def parse_options(args: str):
    regex = re.compile("(?:^| )+-([^ =]+)(?:=([^ ]+))?")
    pos_args = regex.sub("", args)
    options: Options = {
        match.group(1): match.group(2) or True for match in regex.finditer(args)
    }
    return pos_args, options


@dataclass
class Command:
    cmd: str
    top_level: bool
    description: str
    args: str
    args_description: str
    completion: str
    cb: Callable[[str, str], None]


def weechat_command(
    completion: str = "",
    min_args: int = 0,
    split_all_args: bool = False,
    slack_buffer_required: bool = False,
) -> Callable[
    [Callable[[str, List[str], Options], None]],
    Callable[[str, str], None],
]:
    def decorator(
        f: Callable[[str, List[str], Options], None],
    ) -> Callable[[str, str], None]:
        cmd = removeprefix(f.__name__, "command_").replace("_", " ")
        top_level = " " not in cmd

        @wraps(f)
        def wrapper(buffer: str, args: str):
            pos_args, options = parse_options(args)
            maxsplit = -1 if split_all_args else 0 if min_args == 0 else min_args - 1
            split_args = pos_args.split(" ", maxsplit)
            if min_args and not pos_args or len(split_args) < min_args:
                print_error(
                    f'Too few arguments for command "/{cmd}" (help on command: /help {cmd})'
                )
                return
            return f(buffer, split_args, options)

        commands[cmd] = Command(cmd, top_level, "", "", "", completion, wrapper)

        return wrapper

    return decorator


def list_workspaces(workspace_name: Optional[str] = None, detailed_list: bool = False):
    weechat.prnt("", "")
    weechat.prnt("", "All workspaces:")
    for workspace in shared.workspaces.values():
        display_workspace(workspace, detailed_list)


def display_workspace(workspace: SlackWorkspace, detailed_list: bool):
    if workspace.is_connected:
        weechat.prnt(
            "",
            f" * "
            f"{with_color('chat_server', workspace.name)} "
            f"{with_color('chat_delimiters', '[')}"
            f"connected"
            f"{with_color('chat_delimiters', ']')}"
            f", nick: {workspace.my_user.nick.format()}"
            f", 0 channel(s), 0 pv",
        )
    else:
        weechat.prnt("", f"   {with_color('chat_server', workspace.name)}")


@weechat_command()
def command_slack(buffer: str, args: List[str], options: Options):
    """
    slack command
    """
    print("ran slack")


def workspace_connect(workspace: SlackWorkspace):
    if workspace.is_connected:
        print_error(f'already connected to workspace "{workspace.name}"!')
        return
    elif workspace.is_connecting:
        print_error(f'already connecting to workspace "{workspace.name}"!')
        return
    run_async(workspace.connect())


@weechat_command("%(slack_workspaces)|-all", split_all_args=True)
def command_slack_connect(buffer: str, args: List[str], options: Options):
    if options.get("all"):
        for workspace in shared.workspaces.values():
            run_async(workspace.connect())
    elif args[0]:
        for arg in args:
            workspace = shared.workspaces.get(arg)
            if workspace is None:
                print_error(f'workspace "{arg}" not found')
            else:
                workspace_connect(workspace)
    else:
        slack_buffer = shared.buffers.get(buffer)
        if slack_buffer:
            workspace_connect(slack_buffer.workspace)


def workspace_disconnect(workspace: SlackWorkspace):
    if not workspace.is_connected and not workspace.is_connecting:
        print_error(f'not connected to workspace "{workspace.name}"!')
        return
    workspace.disconnect()


@weechat_command("%(slack_workspaces)|-all", split_all_args=True)
def command_slack_disconnect(buffer: str, args: List[str], options: Options):
    if options.get("all"):
        for workspace in shared.workspaces.values():
            workspace.disconnect()
    elif args[0]:
        for arg in args:
            workspace = shared.workspaces.get(arg)
            if workspace is None:
                print_error(f'workspace "{arg}" not found')
            else:
                workspace_disconnect(workspace)
    else:
        slack_buffer = shared.buffers.get(buffer)
        if slack_buffer:
            workspace_disconnect(slack_buffer.workspace)


@weechat_command()
def command_slack_rehistory(buffer: str, args: List[str], options: Options):
    slack_buffer = shared.buffers.get(buffer)
    if slack_buffer:
        run_async(slack_buffer.rerender_history())


@weechat_command()
def command_slack_workspace(buffer: str, args: List[str], options: Options):
    list_workspaces()


@weechat_command("%(slack_workspaces)")
def command_slack_workspace_list(buffer: str, args: List[str], options: Options):
    list_workspaces()


@weechat_command("%(slack_workspaces)")
def command_slack_workspace_listfull(buffer: str, args: List[str], options: Options):
    list_workspaces(detailed_list=True)


@weechat_command(min_args=1)
def command_slack_workspace_add(buffer: str, args: List[str], options: Options):
    name = args[0]
    if name in shared.workspaces:
        print_error(f'workspace "{name}" already exists, can\'t add it!')
        return

    shared.workspaces[name] = SlackWorkspace(name)

    for option_name, option_value in options.items():
        if hasattr(shared.workspaces[name].config, option_name):
            config_option: WeeChatOption[WeeChatOptionTypes] = getattr(
                shared.workspaces[name].config, option_name
            )
            value = "on" if option_value is True else option_value
            config_option.value_set_as_str(value)

    weechat.prnt(
        "",
        f"{shared.SCRIPT_NAME}: workspace added: {weechat.color('chat_server')}{name}{weechat.color('reset')}",
    )


@weechat_command("%(slack_workspaces)", min_args=2)
def command_slack_workspace_rename(buffer: str, args: List[str], options: Options):
    old_name = args[0]
    new_name = args[1]
    workspace = shared.workspaces.get(old_name)
    if not workspace:
        print_error(f'workspace "{old_name}" not found for "workspace rename" command')
        return
    workspace.name = new_name
    shared.workspaces[new_name] = workspace
    del shared.workspaces[old_name]
    weechat.prnt(
        "",
        f"server {with_color('chat_server', old_name)} has been renamed to {with_color('chat_server', new_name)}",
    )
    # TODO: Rename buffers and config


@weechat_command("%(slack_workspaces)", min_args=1)
def command_slack_workspace_del(buffer: str, args: List[str], options: Options):
    name = args[0]
    workspace = shared.workspaces.get(name)
    if not workspace:
        print_error(f'workspace "{name}" not found for "workspace del" command')
        return
    if workspace.is_connected:
        print_error(
            f'you can not delete server "{name}" because you are connected to it. Try "/slack disconnect {name}" first.'
        )
        return
    # TODO: Delete config
    del shared.workspaces[name]
    weechat.prnt(
        "",
        f"server {with_color('chat_server', name)} has been deleted",
    )


@weechat_command("%(threads)", min_args=1)
def command_slack_thread(buffer: str, args: List[str], options: Options):
    slack_buffer = shared.buffers.get(buffer)
    if isinstance(slack_buffer, SlackConversation):
        run_async(slack_buffer.open_thread(args[0], switch=True))


@weechat_command("-alsochannel|%(threads)", min_args=1)
def command_slack_reply(buffer: str, args: List[str], options: Options):
    slack_buffer = shared.buffers.get(buffer)
    broadcast = bool(options.get("alsochannel"))
    if isinstance(slack_buffer, SlackThread):
        run_async(slack_buffer.post_message(args[0], broadcast=broadcast))
    elif isinstance(slack_buffer, SlackConversation):
        split_args = args[0].split(" ", 1)
        if len(split_args) < 2:
            print_error(
                'Too few arguments for command "/slack reply" (help on command: /help slack reply)'
            )
            return
        thread_ts = slack_buffer.ts_from_hash_or_index(split_args[0])
        run_async(slack_buffer.post_message(split_args[1], thread_ts, broadcast))


def print_uncaught_error(error: UncaughtError, detailed: bool, options: Options):
    weechat.prnt("", f"  {error.id} ({error.time}): {error.exception}")
    if detailed:
        for line in format_exception(error.exception):
            weechat.prnt("", f"  {line}")
    if options.get("data"):
        if isinstance(error.exception, SlackRtmError):
            weechat.prnt("", f"  data: {json.dumps(error.exception.message_json)}")
        elif isinstance(error.exception, SlackError):
            weechat.prnt("", f"  data: {json.dumps(error.exception.data)}")
        else:
            print_error("This error does not have any data")


@weechat_command("tasks|buffer|open_buffer|errors|error", split_all_args=True)
def command_slack_debug(buffer: str, args: List[str], options: Options):
    # TODO: Add message info (message_json)
    if args[0] == "tasks":
        weechat.prnt("", "Active tasks:")
        weechat.prnt("", pprint.pformat(shared.active_tasks))
        weechat.prnt("", "Active futures:")
        weechat.prnt("", pprint.pformat(shared.active_futures))
    elif args[0] == "buffer":
        slack_buffer = shared.buffers.get(buffer)
        if isinstance(slack_buffer, SlackConversation):
            weechat.prnt("", f"Conversation id: {slack_buffer.id}")
        elif isinstance(slack_buffer, SlackThread):
            weechat.prnt(
                "",
                f"Conversation id: {slack_buffer.parent.conversation.id}, Thread ts: {slack_buffer.parent.thread_ts}, Thread hash: {slack_buffer.parent.hash}",
            )
    elif args[0] == "open_buffer":
        open_debug_buffer()
    elif args[0] == "errors":
        num_arg = int(args[1]) if len(args) > 1 and args[1].isdecimal() else 5
        num = min(num_arg, len(shared.uncaught_errors))
        weechat.prnt("", f"Last {num} errors:")
        for error in shared.uncaught_errors[-num:]:
            print_uncaught_error(error, False, options)
    elif args[0] == "error":
        if len(args) > 1:
            if args[1].isdecimal() and args[1] != "0":
                num = int(args[1])
                if num > len(shared.uncaught_errors):
                    print_error(
                        f"Only {len(shared.uncaught_errors)} error(s) have occurred"
                    )
                    return
                error = shared.uncaught_errors[-num]
            else:
                errors = [e for e in shared.uncaught_errors if e.id == args[1]]
                if not errors:
                    print_error(f"Error {args[1]} not found")
                    return
                error = errors[0]
            weechat.prnt("", f"Error {error.id}:")
        elif not shared.uncaught_errors:
            weechat.prnt("", "No errors have occurred")
            return
        else:
            error = shared.uncaught_errors[-1]
            weechat.prnt("", "Last error:")
        print_uncaught_error(error, True, options)


def completion_slack_workspaces_cb(
    data: str, completion_item: str, buffer: str, completion: str
) -> int:
    for workspace_name in shared.workspaces:
        weechat.completion_list_add(
            completion, workspace_name, 0, weechat.WEECHAT_LIST_POS_SORT
        )
    return weechat.WEECHAT_RC_OK


def find_command(start_cmd: str, args: str) -> Optional[Tuple[Command, str]]:
    args_parts = re.finditer("[^ ]+", args)
    cmd = start_cmd
    cmd_args_startpos = 0

    for part in args_parts:
        next_cmd = f"{cmd} {part.group(0)}"
        if next_cmd not in commands:
            cmd_args_startpos = part.start(0)
            break
        cmd = next_cmd
    else:
        cmd_args_startpos = len(args)

    cmd_args = args[cmd_args_startpos:]
    if cmd in commands:
        return commands[cmd], cmd_args
    return None


def command_cb(data: str, buffer: str, args: str) -> int:
    found_cmd_with_args = find_command(data, args)
    if found_cmd_with_args:
        command = found_cmd_with_args[0]
        cmd_args = found_cmd_with_args[1]
        command.cb(buffer, cmd_args)
    else:
        print_error(
            f'Error with command "/{data} {args}" (help on command: /help {data})'
        )

    return weechat.WEECHAT_RC_OK


def completion_list_add_expand(
    completion: str, word: str, nick_completion: int, where: str, buffer: str
):
    if word == "%(slack_workspaces)":
        completion_slack_workspaces_cb("", "slack_workspaces", buffer, completion)
    elif word == "%(threads)":
        completion_thread_hashes_cb("", "threads", buffer, completion)
    else:
        weechat.completion_list_add(completion, word, nick_completion, where)


def completion_slack_workspace_commands_cb(
    data: str, completion_item: str, buffer: str, completion: str
) -> int:
    base_command = weechat.completion_get_string(completion, "base_command")
    base_word = weechat.completion_get_string(completion, "base_word")
    args = weechat.completion_get_string(completion, "args")
    args_without_base_word = removesuffix(args, base_word)

    found_cmd_with_args = find_command(base_command, args_without_base_word)
    if found_cmd_with_args:
        command = found_cmd_with_args[0]
        matching_cmds = [
            removeprefix(cmd, command.cmd).lstrip()
            for cmd in commands
            if cmd.startswith(command.cmd) and cmd != command.cmd
        ]
        if len(matching_cmds) > 1:
            for match in matching_cmds:
                cmd_arg = match.split(" ")
                completion_list_add_expand(
                    completion, cmd_arg[0], 0, weechat.WEECHAT_LIST_POS_SORT, buffer
                )
        else:
            for arg in command.completion.split("|"):
                completion_list_add_expand(
                    completion, arg, 0, weechat.WEECHAT_LIST_POS_SORT, buffer
                )

    return weechat.WEECHAT_RC_OK


def completion_emojis_cb(
    data: str, completion_item: str, buffer: str, completion: str
) -> int:
    slack_buffer = shared.buffers.get(buffer)
    if slack_buffer is None:
        return weechat.WEECHAT_RC_OK

    base_word = weechat.completion_get_string(completion, "base_word")
    reaction = re.match(REACTION_PREFIX_REGEX_STRING + ":", base_word)
    prefix = reaction.group(0) if reaction else ":"

    emoji_names = chain(
        shared.standard_emojis.keys(), slack_buffer.workspace.custom_emojis.keys()
    )
    for emoji_name in emoji_names:
        if "::skin-tone-" not in emoji_name:
            weechat.completion_list_add(
                completion,
                f"{prefix}{emoji_name}:",
                0,
                weechat.WEECHAT_LIST_POS_SORT,
            )
    return weechat.WEECHAT_RC_OK


def completion_slack_channels_cb(
    data: str, completion_item: str, buffer: str, completion: str
) -> int:
    slack_buffer = shared.buffers.get(buffer)
    if slack_buffer is None:
        return weechat.WEECHAT_RC_OK

    conversations = slack_buffer.workspace.open_conversations.values()
    for conversation in conversations:
        if conversation.buffer_type == "channel":
            weechat.completion_list_add(
                completion,
                conversation.name_with_prefix("short_name_without_padding"),
                0,
                weechat.WEECHAT_LIST_POS_SORT,
            )
    return weechat.WEECHAT_RC_OK


def completion_nicks_cb(
    data: str, completion_item: str, buffer: str, completion: str
) -> int:
    slack_buffer = shared.buffers.get(buffer)
    if slack_buffer is None:
        return weechat.WEECHAT_RC_OK

    buffer_nicks = [user.nick.raw_nick for user in slack_buffer.members]
    for nick in buffer_nicks:
        weechat.completion_list_add(
            completion,
            nick,
            1,
            weechat.WEECHAT_LIST_POS_SORT,
        )
        weechat.completion_list_add(
            completion,
            f"@{nick}",
            1,
            weechat.WEECHAT_LIST_POS_SORT,
        )

    senders = [
        m.sender_user_id
        for m in slack_buffer.messages.values()
        if m.sender_user_id and m.subtype in [None, "me_message", "thread_broadcast"]
    ]
    unique_senders = list(dict.fromkeys(senders))
    sender_user_futures = [
        slack_buffer.workspace.users[sender] for sender in unique_senders
    ]
    sender_users = [
        future.result() for future in sender_user_futures if future.done_with_result()
    ]
    nicks = [user.nick.raw_nick for user in sender_users]
    for nick in nicks:
        weechat.completion_list_add(
            completion,
            nick,
            1,
            weechat.WEECHAT_LIST_POS_BEGINNING,
        )
        weechat.completion_list_add(
            completion,
            f"@{nick}",
            1,
            weechat.WEECHAT_LIST_POS_BEGINNING,
        )

    my_user_nick = slack_buffer.workspace.my_user.nick.raw_nick
    weechat.completion_list_add(
        completion,
        my_user_nick,
        1,
        weechat.WEECHAT_LIST_POS_END,
    )
    weechat.completion_list_add(
        completion,
        f"@{my_user_nick}",
        1,
        weechat.WEECHAT_LIST_POS_END,
    )

    return weechat.WEECHAT_RC_OK


def completion_thread_hashes_cb(
    data: str, completion_item: str, buffer: str, completion: str
) -> int:
    slack_buffer = shared.buffers.get(buffer)
    if not isinstance(slack_buffer, SlackConversation):
        return weechat.WEECHAT_RC_OK

    message_tss = sorted(slack_buffer.message_hashes.keys())
    messages = [slack_buffer.messages.get(ts) for ts in message_tss]
    thread_messages = [
        message
        for message in messages
        if message is not None and message.is_thread_parent
    ]
    for message in thread_messages:
        weechat.completion_list_add(
            completion, message.hash, 0, weechat.WEECHAT_LIST_POS_BEGINNING
        )
    for message in thread_messages:
        weechat.completion_list_add(
            completion, f"${message.hash}", 0, weechat.WEECHAT_LIST_POS_BEGINNING
        )
    return weechat.WEECHAT_RC_OK


def complete_input(slack_buffer: SlackBuffer, query: str):
    if (
        slack_buffer.completion_context == "ACTIVE_COMPLETION"
        and slack_buffer.completion_values
    ):
        input_value = weechat.buffer_get_string(slack_buffer.buffer_pointer, "input")
        input_pos = weechat.buffer_get_integer(slack_buffer.buffer_pointer, "input_pos")
        result = slack_buffer.completion_values[slack_buffer.completion_index]
        input_before = removesuffix(input_value[:input_pos], query)
        input_after = input_value[input_pos:]
        new_input = input_before + result + input_after
        new_pos = input_pos - len(query) + len(result)

        with slack_buffer.completing():
            weechat.buffer_set(slack_buffer.buffer_pointer, "input", new_input)
            weechat.buffer_set(slack_buffer.buffer_pointer, "input_pos", str(new_pos))


def nick_suffix():
    return weechat.config_string(
        weechat.config_get("weechat.completion.nick_completer")
    )


async def complete_user_next(
    slack_buffer: SlackBuffer, query: str, is_first_word: bool
):
    if slack_buffer.completion_context == "NO_COMPLETION":
        slack_buffer.completion_context = "PENDING_COMPLETION"
        search = await slack_buffer.workspace.api.edgeapi.fetch_users_search(query)
        if slack_buffer.completion_context != "PENDING_COMPLETION":
            return
        slack_buffer.completion_context = "ACTIVE_COMPLETION"
        suffix = nick_suffix() if is_first_word else " "
        slack_buffer.completion_values = [
            get_user_nick(name_from_user_info(slack_buffer.workspace, user)).raw_nick
            + suffix
            for user in search["results"]
        ]
        slack_buffer.completion_index = 0
    elif slack_buffer.completion_context == "ACTIVE_COMPLETION":
        slack_buffer.completion_index += 1
        if slack_buffer.completion_index >= len(slack_buffer.completion_values):
            slack_buffer.completion_index = 0

    complete_input(slack_buffer, query)


def complete_previous(slack_buffer: SlackBuffer, query: str) -> int:
    if slack_buffer.completion_context == "ACTIVE_COMPLETION":
        slack_buffer.completion_index -= 1
        if slack_buffer.completion_index < 0:
            slack_buffer.completion_index = len(slack_buffer.completion_values) - 1
        complete_input(slack_buffer, query)
        return weechat.WEECHAT_RC_OK_EAT
    return weechat.WEECHAT_RC_OK


async def mark_read(slack_buffer: SlackBuffer):
    # Sleep so the read marker is updated before we run slack_buffer.mark_read
    await sleep(1)
    await slack_buffer.mark_read()


def buffer_set_unread_cb(data: str, buffer: str, command: str) -> int:
    slack_buffer = shared.buffers.get(buffer)
    if slack_buffer:
        run_async(mark_read(slack_buffer))
    return weechat.WEECHAT_RC_OK


def input_complete_cb(data: str, buffer: str, command: str) -> int:
    slack_buffer = shared.buffers.get(buffer)
    if slack_buffer:
        input_value = weechat.buffer_get_string(buffer, "input")
        input_pos = weechat.buffer_get_integer(buffer, "input_pos")
        input_before_cursor = input_value[:input_pos]

        word_index = (
            -2 if slack_buffer.completion_context == "ACTIVE_COMPLETION" else -1
        )
        word_until_cursor = " ".join(input_before_cursor.split(" ")[word_index:])

        if word_until_cursor.startswith("@"):
            query = word_until_cursor[1:]
            is_first_word = word_until_cursor == input_before_cursor

            if command == "/input complete_next":
                run_async(complete_user_next(slack_buffer, query, is_first_word))
                return weechat.WEECHAT_RC_OK_EAT
            else:
                return complete_previous(slack_buffer, query)
    return weechat.WEECHAT_RC_OK


def register_commands():
    if shared.weechat_version < 0x02090000:
        weechat.completion_get_string = (
            weechat.hook_completion_get_string  # pyright: ignore [reportUnknownMemberType, reportGeneralTypeIssues]
        )
        weechat.completion_list_add = (
            weechat.hook_completion_list_add  # pyright: ignore [reportUnknownMemberType, reportGeneralTypeIssues]
        )

    weechat.hook_command_run(
        "/buffer set unread", get_callback_name(buffer_set_unread_cb), ""
    )
    weechat.hook_command_run(
        "/buffer set unread *", get_callback_name(buffer_set_unread_cb), ""
    )
    weechat.hook_command_run(
        "/input set_unread_current_buffer", get_callback_name(buffer_set_unread_cb), ""
    )
    # Disable until working properly
    # weechat.hook_command_run(
    #     "/input complete_*", get_callback_name(input_complete_cb), ""
    # )
    weechat.hook_completion(
        "slack_workspaces",
        "Slack workspaces (internal names)",
        get_callback_name(completion_slack_workspaces_cb),
        "",
    )
    weechat.hook_completion(
        "slack_commands",
        "completions for Slack commands",
        get_callback_name(completion_slack_workspace_commands_cb),
        "",
    )
    weechat.hook_completion(
        "slack_channels",
        "conversations in the current Slack workspace",
        get_callback_name(completion_slack_channels_cb),
        "",
    )
    weechat.hook_completion(
        "slack_emojis",
        "Emoji names known to Slack",
        get_callback_name(completion_emojis_cb),
        "",
    )
    weechat.hook_completion(
        "nicks",
        "nicks in the current Slack buffer",
        get_callback_name(completion_nicks_cb),
        "",
    )
    weechat.hook_completion(
        "threads",
        "complete thread ids for slack",
        get_callback_name(completion_thread_hashes_cb),
        "",
    )

    for cmd, command in commands.items():
        if command.top_level:
            weechat.hook_command(
                command.cmd,
                command.description,
                command.args,
                command.args_description,
                "%(slack_commands)|%*",
                get_callback_name(command_cb),
                cmd,
            )