from dataclasses import dataclass, field, fields
from datetime import datetime
from typing import Any, Callable, Optional, List, Literal, TypeVar

from bs4 import BeautifulSoup

from mastoposter.utils import node_to_html, node_to_markdown, node_to_plaintext


def _date(val: str) -> datetime:
    return datetime.fromisoformat(val.rstrip("Z"))


T = TypeVar("T")


def _fnil(fn: Callable[[Any], T], val: Optional[Any]) -> Optional[T]:
    return None if val is None else fn(val)


def _date_or_none(val: Optional[str]) -> Optional[datetime]:
    return _fnil(_date, val)


def _int_or_none(val: Optional[str]) -> Optional[int]:
    return _fnil(int, val)


@dataclass
class Field:
    name: str
    value: str
    verified_at: Optional[datetime] = None

    @classmethod
    def from_dict(cls, data: dict) -> "Field":
        return cls(
            name=data["name"],
            value=data["value"],
            verified_at=_date_or_none(data.get("verified_at")),
        )


@dataclass
class Emoji:
    shortcode: str
    url: str
    static_url: str
    visible_in_picker: bool
    category: Optional[str] = None

    @classmethod
    def from_dict(cls, data: dict) -> "Emoji":
        return cls(**{f.name: data[f.name] for f in fields(cls) if f in data})


@dataclass
class Account:
    id: str
    username: str
    acct: str
    url: str
    display_name: str
    note: str
    avatar: str
    avatar_static: str
    header: str
    header_static: str
    locked: bool
    emojis: List[Emoji]
    discoverable: bool
    created_at: datetime
    last_status_at: datetime
    statuses_count: int
    followers_count: int
    following_count: int
    moved: Optional["Account"] = None
    fields: Optional[List[Field]] = None
    bot: Optional[bool] = None

    @classmethod
    def from_dict(cls, data: dict) -> "Account":
        return cls(
            id=data["id"],
            username=data["username"],
            acct=data["acct"],
            url=data["url"],
            display_name=data["display_name"],
            note=data["note"],
            avatar=data["avatar"],
            avatar_static=data["avatar_static"],
            header=data["header"],
            header_static=data["header_static"],
            locked=data["locked"],
            emojis=list(map(Emoji.from_dict, data["emojis"])),
            discoverable=data.get("discoverable", False),
            created_at=_date(data["created_at"]),
            last_status_at=_date(data["last_status_at"]),
            statuses_count=data["statuses_count"],
            followers_count=data["followers_count"],
            following_count=data["following_count"],
            moved=_fnil(Account.from_dict, data.get("moved")),
            fields=list(map(Field.from_dict, data.get("fields", []))),
            bot=bool(data.get("bot")),
        )

    @property
    def name(self) -> str:
        return self.display_name or self.username


@dataclass
class AttachmentMetaImage:
    @dataclass
    class Vec2F:
        x: float
        y: float

    @dataclass
    class AttachmentMetaImageDimensions:
        width: int
        height: int
        size: str
        aspect: float

    original: AttachmentMetaImageDimensions
    small: AttachmentMetaImageDimensions
    focus: Vec2F

    @classmethod
    def from_dict(cls, data: dict) -> "AttachmentMetaImage":
        return cls(
            **{f.name: data[f.name] for f in fields(cls) if f in data},
            original=cls.AttachmentMetaImageDimensions(**data["original"]),
            small=cls.AttachmentMetaImageDimensions(**data["small"]),
            focus=cls.Vec2F(**data["focus"])
        )


@dataclass
class AttachmentMetaVideo:
    @dataclass
    class AttachmentMetaVideoOriginal:
        width: int
        height: int
        duration: float
        bitrate: int
        frame_rate: Optional[str]  # XXX Gargron wtf?

    @dataclass
    class AttachmentMetaVideoSmall:
        width: int
        height: int
        size: str
        aspect: float

    length: str
    duration: float
    fps: int
    size: str
    width: int
    height: int
    aspect: float
    audio_encode: str
    audio_bitrate: str  # XXX GARGROOOOONNNNNN!!!!!!!
    audio_channels: str  # XXX I HATE YOU
    original: AttachmentMetaVideoOriginal
    small: AttachmentMetaVideoSmall

    @classmethod
    def from_dict(cls, data: dict) -> "AttachmentMetaVideo":
        return cls(
            **data,
            original=cls.AttachmentMetaVideoOriginal(**data["original"]),
            small=cls.AttachmentMetaVideoSmall(**data["small"])
        )


@dataclass
class Attachment:
    id: str
    type: Literal["unknown", "image", "gifv", "video", "audio"]
    url: str
    preview_url: str
    remote_url: Optional[str] = None
    preview_remote_url: Optional[str] = None
    meta: Optional[dict] = None
    description: Optional[str] = None
    blurhash: Optional[str] = None
    text_url: Optional[str] = None  # XXX: DEPRECATED

    @classmethod
    def from_dict(cls, data: dict) -> "Attachment":
        return cls(**{f.name: data[f.name] for f in fields(cls) if f in data})


@dataclass
class Application:
    name: str
    website: Optional[str] = None
    vapid_key: Optional[str] = None

    @classmethod
    def from_dict(cls, data: dict) -> "Application":
        return cls(**{f.name: data[f.name] for f in fields(cls) if f in data})


@dataclass
class Mention:
    id: str
    username: str
    acct: str
    url: str

    @classmethod
    def from_dict(cls, data: dict) -> "Mention":
        return cls(**{f.name: data[f.name] for f in fields(cls) if f in data})


@dataclass
class Tag:
    name: str
    url: str

    @classmethod
    def from_dict(cls, data: dict) -> "Tag":
        return cls(**{f.name: data[f.name] for f in fields(cls) if f in data})


@dataclass
class Poll:
    @dataclass
    class PollOption:
        title: str
        votes_count: Optional[int] = None

    id: str
    expires_at: Optional[datetime]
    expired: bool
    multiple: bool
    votes_count: int
    voters_count: Optional[int] = None
    options: List[PollOption] = field(default_factory=list)
    emojis: List[Emoji] = field(default_factory=list)

    @classmethod
    def from_dict(cls, data: dict) -> "Poll":
        return cls(
            id=data["id"],
            expires_at=_date_or_none(data.get("expires_at")),
            expired=data["expired"],
            multiple=data["multiple"],
            votes_count=data["votes_count"],
            voters_count=_int_or_none(data.get("voters_count")),
            options=[cls.PollOption(**opt) for opt in data["options"]],
        )


@dataclass
class Status:
    id: str
    uri: str
    created_at: datetime
    account: Account
    content: str
    visibility: Literal["public", "unlisted", "private", "direct"]
    sensitive: bool
    spoiler_text: str
    media_attachments: List[Attachment]
    reblogs_count: int
    favourites_count: int
    replies_count: int
    mentions: List[Mention]
    tags: List[Tag]
    application: Optional[Application] = None
    url: Optional[str] = None
    in_reply_to_id: Optional[str] = None
    in_reply_to_account_id: Optional[str] = None
    reblog: Optional["Status"] = None
    poll: Optional[Poll] = None
    card: Optional[dict] = None
    language: Optional[str] = None
    text: Optional[str] = None

    @classmethod
    def from_dict(cls, data: dict) -> "Status":
        return cls(
            id=data["id"],
            uri=data["uri"],
            created_at=_date(data["created_at"]),
            account=Account.from_dict(data["account"]),
            content=data["content"],
            visibility=data["visibility"],
            sensitive=data["sensitive"],
            spoiler_text=data["spoiler_text"],
            media_attachments=list(
                map(Attachment.from_dict, data["media_attachments"])
            ),
            application=_fnil(Application.from_dict, data.get("application")),
            reblogs_count=data["reblogs_count"],
            favourites_count=data["favourites_count"],
            replies_count=data["replies_count"],
            url=data.get("url"),
            in_reply_to_id=data.get("in_reply_to_id"),
            in_reply_to_account_id=data.get("in_reply_to_account_id"),
            reblog=_fnil(Status.from_dict, data.get("reblog")),
            poll=_fnil(Poll.from_dict, data.get("poll")),
            card=data.get("card"),
            language=data.get("language"),
            text=data.get("text"),
            mentions=[Mention.from_dict(m) for m in data.get("mentions", [])],
            tags=[Tag.from_dict(m) for m in data.get("tags", [])],
        )

    @property
    def reblog_or_status(self) -> "Status":
        return self.reblog or self

    @property
    def link(self) -> str:
        return self.account.url + "/" + str(self.id)

    @property
    def content_flathtml(self) -> str:
        return node_to_html(
            BeautifulSoup(self.content, features="lxml")
        ).rstrip()

    @property
    def content_markdown(self) -> str:
        return node_to_markdown(
            BeautifulSoup(self.content, features="lxml")
        ).rstrip()

    @property
    def content_plaintext(self) -> str:
        return node_to_plaintext(
            BeautifulSoup(self.content, features="lxml")
        ).rstrip()