"""Yandex OAuth client with Disk API support.

Scopes requested:
- login:email — email address
- login:info — login, first+last name
- login:avatar — avatar URL
- cloud_api:disk.write — write anywhere on Disk
- cloud_api:disk.app_folder — access app folder on Disk
- cloud_api:disk.read — read entire Disk
- cloud_api:disk.info — Disk info (quota, etc.)
"""

from dataclasses import dataclass

import httpx

from app.core.config import get_settings

YANDEX_OAUTH_URL = "https://oauth.yandex.ru"
YANDEX_LOGIN_URL = "https://login.yandex.ru"
YANDEX_DISK_URL = "https://cloud-api.yandex.net/v1/disk"

SCOPES = " ".join([
    "login:email",
    "login:info",
    "login:avatar",
    "cloud_api:disk.write",
    "cloud_api:disk.app_folder",
    "cloud_api:disk.read",
    "cloud_api:disk.info",
])

VOIDEA_DISK_FOLDER = "VoIdeaAI"


@dataclass
class YandexUserInfo:
    id: str
    login: str
    email: str
    display_name: str
    avatar_url: str | None


@dataclass
class YandexTokenResult:
    access_token: str
    refresh_token: str | None
    expires_in: int


async def get_authorize_url() -> str:
    """Generate Yandex OAuth authorization URL."""
    settings = get_settings()
    params = {
        "response_type": "code",
        "client_id": settings.oauth_yandex_id,
        "redirect_uri": settings.oauth_yandex_redirect_uri,
        "scope": SCOPES,
    }
    query = "&".join(f"{k}={v}" for k, v in params.items())
    return f"{YANDEX_OAUTH_URL}/authorize?{query}"


async def exchange_code(code: str) -> YandexTokenResult | None:
    """Exchange authorization code for access token.

    Args:
        code: Authorization code from OAuth callback

    Returns:
        Token result or None if exchange failed
    """
    settings = get_settings()
    if not settings.oauth_yandex_id or not settings.oauth_yandex_secret:
        return None

    async with httpx.AsyncClient() as client:
        resp = await client.post(
            f"{YANDEX_OAUTH_URL}/token",
            data={
                "grant_type": "authorization_code",
                "code": code,
                "client_id": settings.oauth_yandex_id,
                "client_secret": settings.oauth_yandex_secret,
            },
        )
        if resp.status_code != 200:
            return None
        data = resp.json()
        return YandexTokenResult(
            access_token=data["access_token"],
            refresh_token=data.get("refresh_token"),
            expires_in=data.get("expires_in", 0),
        )


async def get_user_info(access_token: str) -> YandexUserInfo | None:
    """Get user info from Yandex Login API.

    Args:
        access_token: Valid OAuth access token

    Returns:
        User info or None if request failed
    """
    async with httpx.AsyncClient() as client:
        resp = await client.get(
            f"{YANDEX_LOGIN_URL}/info",
            params={"format": "json"},
            headers={"Authorization": f"OAuth {access_token}"},
        )
        if resp.status_code != 200:
            return None
        data = resp.json()

        avatar_url: str | None = None
        if data.get("default_avatar_id"):
            avatar_url = (
                f"https://avatars.yandex.net/get-yapic/{data['default_avatar_id']}/islands-200"
            )

        display_name = data.get("real_name") or data.get("display_name") or data.get("login", "")
        email = data.get("default_email") or ""

        return YandexUserInfo(
            id=str(data["id"]),
            login=data.get("login", ""),
            email=email,
            display_name=display_name,
            avatar_url=avatar_url,
        )


async def ensure_app_folder(access_token: str) -> bool:
    """Create VoIdeaAI folder on Yandex.Disk if it doesn't exist.

    Args:
        access_token: Valid OAuth access token with disk.write scope

    Returns:
        True if folder exists (created or already present)
    """
    async with httpx.AsyncClient() as client:
        resp = await client.put(
            f"{YANDEX_DISK_URL}/resources",
            params={"path": VOIDEA_DISK_FOLDER},
            headers={"Authorization": f"OAuth {access_token}"},
        )
        return resp.status_code in (201, 409)


async def get_disk_info(access_token: str) -> dict | None:
    """Get Yandex.Disk info (quota, usage).

    Args:
        access_token: Valid OAuth access token

    Returns:
        Disk info dict or None
    """
    async with httpx.AsyncClient() as client:
        resp = await client.get(
            f"{YANDEX_DISK_URL}",
            headers={"Authorization": f"OAuth {access_token}"},
        )
        return resp.json() if resp.status_code == 200 else None


async def upload_file(access_token: str, local_path: str, remote_name: str) -> bool:
    """Upload a file to VoIdeaAI folder on Yandex.Disk.

    Args:
        access_token: Valid OAuth access token
        local_path: Path to local file
        remote_name: Name for the file on Disk

    Returns:
        True if upload succeeded
    """
    import os

    if not os.path.exists(local_path):
        return False

    remote_path = f"{VOIDEA_DISK_FOLDER}/{remote_name}"

    async with httpx.AsyncClient() as client:
        # 1. Get upload URL
        resp = await client.get(
            f"{YANDEX_DISK_URL}/resources/upload",
            params={"path": remote_path, "overwrite": "true"},
            headers={"Authorization": f"OAuth {access_token}"},
        )
        if resp.status_code != 200:
            return False
        upload_url = resp.json().get("href")
        if not upload_url:
            return False

        # 2. Upload file
        with open(local_path, "rb") as f:
            upload_resp = await client.put(upload_url, content=f)
            return upload_resp.status_code in (201, 202)