from __future__ import annotations

import ctypes
import inspect
import os
import socket
import sys
from collections.abc import Callable
from pathlib import Path
from typing import TYPE_CHECKING
from typing import Any
from typing import TypedDict
from typing import TypeVar

import httpx
import pymysql

import app.settings
from app.logging import Ansi
from app.logging import log

if TYPE_CHECKING:
    from app.repositories.users import User

T = TypeVar("T")


DATA_PATH = Path.cwd() / ".data"
ACHIEVEMENTS_ASSETS_PATH = DATA_PATH / "assets/medals/client"
DEFAULT_AVATAR_PATH = DATA_PATH / "avatars/default.jpg"


def make_safe_name(name: str) -> str:
    """Return a name safe for usage in sql."""
    return name.lower().replace(" ", "_")


def determine_highest_ranking_clan_member(members: list[User]) -> User:
    return next(iter(sorted(members, key=lambda m: m["clan_priv"], reverse=True)))


def _download_achievement_images_osu(achievements_path: Path) -> bool:
    """Download all used achievement images (one by one, from osu!)."""
    achs: list[str] = []

    for resolution in ("", "@2x"):
        for mode in ("osu", "taiko", "fruits", "mania"):
            # only osu!std has 9 & 10 star pass/fc medals.
            for star_rating in range(1, 1 + (10 if mode == "osu" else 8)):
                achs.append(f"{mode}-skill-pass-{star_rating}{resolution}.png")
                achs.append(f"{mode}-skill-fc-{star_rating}{resolution}.png")

        for combo in (500, 750, 1000, 2000):
            achs.append(f"osu-combo-{combo}{resolution}.png")

        for mod in (
            "suddendeath",
            "hidden",
            "perfect",
            "hardrock",
            "doubletime",
            "flashlight",
            "easy",
            "nofail",
            "nightcore",
            "halftime",
            "spunout",
        ):
            achs.append(f"all-intro-{mod}{resolution}.png")

    log("Downloading achievement images from osu!.", Ansi.LCYAN)

    for ach in achs:
        resp = httpx.get(f"https://assets.ppy.sh/medals/client/{ach}")
        if resp.status_code != 200:
            return False

        log(f"Saving achievement: {ach}", Ansi.LCYAN)
        (achievements_path / ach).write_bytes(resp.content)

    return True


def download_achievement_images(achievements_path: Path) -> None:
    """Download all used achievement images (using the best available source)."""

    # download individual files from the official osu! servers
    downloaded = _download_achievement_images_osu(achievements_path)

    if downloaded:
        log("Downloaded all achievement images.", Ansi.LGREEN)
    else:
        # TODO: make the code safe in this state
        log("Failed to download achievement images.", Ansi.LRED)
        achievements_path.rmdir()

        # allow passthrough (don't hard crash).
        # the server will *mostly* work in this state.
        pass


def download_default_avatar(default_avatar_path: Path) -> None:
    """Download an avatar to use as the server's default."""
    resp = httpx.get("https://i.cmyui.xyz/U24XBZw-4wjVME-JaEz3.png")

    if resp.status_code != 200:
        log("Failed to fetch default avatar.", Ansi.LRED)
        return

    log("Downloaded default avatar.", Ansi.LGREEN)
    default_avatar_path.write_bytes(resp.content)


def has_internet_connectivity(timeout: float = 1.0) -> bool:
    """Check for an active internet connection."""
    COMMON_DNS_SERVERS = (
        # Cloudflare
        "1.1.1.1",
        "1.0.0.1",
        # Google
        "8.8.8.8",
        "8.8.4.4",
    )
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as client:
        client.settimeout(timeout)
        for host in COMMON_DNS_SERVERS:
            try:
                client.connect((host, 53))
            except OSError:
                continue
            else:
                return True

    # all connections failed
    return False


class FrameInfo(TypedDict):
    function: str
    filename: str
    lineno: int
    charno: int
    locals: dict[str, str]


def get_appropriate_stacktrace() -> list[FrameInfo]:
    """Return information of all frames related to cmyui_pkg and below."""
    stack = inspect.stack()[1:]
    for idx, frame in enumerate(stack):
        if frame.function == "run":
            break
    else:
        raise Exception

    return [
        {
            "function": frame.function,
            "filename": Path(frame.filename).name,
            "lineno": frame.lineno,
            "charno": frame.index or 0,
            "locals": {k: repr(v) for k, v in frame.frame.f_locals.items()},
        }
        # reverse for python-like stacktrace
        # ordering; puts the most recent
        # call closest to the command line
        for frame in reversed(stack[:idx])
    ]


def pymysql_encode(
    conv: Callable[[Any, dict[object, object] | None], str],
) -> Callable[[type[T]], type[T]]:
    """Decorator to allow for adding to pymysql's encoders."""

    def wrapper(cls: type[T]) -> type[T]:
        pymysql.converters.encoders[cls] = conv
        return cls

    return wrapper


def escape_enum(
    val: Any,
    _: dict[object, object] | None = None,
) -> str:  # used for ^
    return str(int(val))


def ensure_persistent_volumes_are_available() -> None:
    # create /.data directory
    DATA_PATH.mkdir(exist_ok=True)

    # create /.data/... subdirectories
    for sub_dir in ("avatars", "logs", "osu", "osr", "ss"):
        subdir = DATA_PATH / sub_dir
        subdir.mkdir(exist_ok=True)

    # download achievement images from osu!
    if not ACHIEVEMENTS_ASSETS_PATH.exists():
        ACHIEVEMENTS_ASSETS_PATH.mkdir(parents=True)
        download_achievement_images(ACHIEVEMENTS_ASSETS_PATH)

    # download a default avatar image for new users
    if not DEFAULT_AVATAR_PATH.exists():
        download_default_avatar(DEFAULT_AVATAR_PATH)


def is_running_as_admin() -> bool:
    try:
        return os.geteuid() == 0  # type: ignore[attr-defined, no-any-return, unused-ignore]
    except AttributeError:
        pass

    try:
        return ctypes.windll.shell32.IsUserAnAdmin() == 1  # type: ignore[attr-defined, no-any-return, unused-ignore]
    except AttributeError:
        raise Exception(
            f"{sys.platform} is not currently supported on bancho.py, please create a github issue!",
        )


def display_startup_dialog() -> None:
    """Print any general information or warnings to the console."""
    if app.settings.DEVELOPER_MODE:
        log("running in advanced mode", Ansi.LYELLOW)
    if app.settings.DEBUG:
        log("running in debug mode", Ansi.LMAGENTA)

    # running on root/admin grants the software potentally dangerous and
    # unnecessary power over the operating system and is not advised.
    if is_running_as_admin():
        log(
            "It is not recommended to run bancho.py as root/admin, especially in production."
            + (
                " You are at increased risk as developer mode is enabled."
                if app.settings.DEVELOPER_MODE
                else ""
            ),
            Ansi.LYELLOW,
        )

    if not has_internet_connectivity():
        log("No internet connectivity detected", Ansi.LYELLOW)


def has_jpeg_headers_and_trailers(data_view: memoryview) -> bool:
    return data_view[:4] == b"\xff\xd8\xff\xe0" and data_view[6:11] == b"JFIF\x00"


def has_png_headers_and_trailers(data_view: memoryview) -> bool:
    return (
        data_view[:8] == b"\x89PNG\r\n\x1a\n"
        and data_view[-8:] == b"\x49END\xae\x42\x60\x82"
    )