from __future__ import annotations

import base64
import logging
import time
from dataclasses import dataclass, field
from urllib.parse import urljoin

import httpx

logger = logging.getLogger(__name__)

OCS_CAPABILITIES_PATH = "/ocs/v2.php/cloud/capabilities"
PROBE_TIMEOUT = 10.0


@dataclass
class NextcloudTalkProbeResult:
    ok: bool = False
    base_url: str = ""
    reachable: bool = False
    latency_ms: float | None = None
    nextcloud_version: str | None = None
    talk_app_installed: bool = False
    bots_v1_available: bool = False
    reactions_available: bool = False
    api_credentials_valid: bool | None = None
    # --feature response cannot be verified without a valid room token
    feature_response_checkable: bool = False
    warnings: list[str] = field(default_factory=list)
    error: str | None = None


async def probe_nextcloud_talk_connectivity(base_url: str) -> dict:
    if not base_url:
        return {"reachable": False, "error": "base_url is not configured"}

    url = urljoin(base_url.rstrip("/") + "/", OCS_CAPABILITIES_PATH)
    start = time.monotonic()

    try:
        async with httpx.AsyncClient(timeout=PROBE_TIMEOUT) as client:
            resp = await client.get(
                url,
                headers={
                    "OCS-APIRequest": "true",
                    "Accept": "application/json",
                },
            )
        latency_ms = (time.monotonic() - start) * 1000

        if resp.status_code != 200:
            return {"reachable": False, "latency_ms": latency_ms, "error": f"HTTP {resp.status_code}"}

        data = resp.json()
        ocs_data = data.get("ocs", {}).get("data", {})
        version = ocs_data.get("version", {}).get("string")
        capabilities = ocs_data.get("capabilities", {})
        talk_installed = "spreed" in capabilities
        talk_capabilities = capabilities.get("spreed", {}).get("features", [])

        return {
            "reachable": True,
            "latency_ms": round(latency_ms, 1),
            "nextcloud_version": version,
            "talk_app_installed": talk_installed,
            "bots_v1_available": "bots-v1" in talk_capabilities,
            "reactions_available": "reactions" in talk_capabilities,
        }
    except httpx.TimeoutException:
        return {"reachable": False, "error": "connection timeout"}
    except httpx.ConnectError as e:
        return {"reachable": False, "error": f"connection failed: {e}"}
    except Exception as e:
        return {"reachable": False, "error": str(e)}


async def probe_nextcloud_talk_api_credentials(base_url: str, api_user: str, api_password: str) -> dict:
    if not api_user or not api_password:
        return {"valid": None, "error": "API credentials not configured"}

    url = urljoin(base_url.rstrip("/") + "/", OCS_CAPABILITIES_PATH)
    auth = base64.b64encode(f"{api_user}:{api_password}".encode()).decode()

    try:
        async with httpx.AsyncClient(timeout=PROBE_TIMEOUT) as client:
            resp = await client.get(
                url,
                headers={
                    "Authorization": f"Basic {auth}",
                    "OCS-APIRequest": "true",
                    "Accept": "application/json",
                },
            )
        if resp.status_code == 200:
            return {"valid": True}
        if resp.status_code == 401:
            return {"valid": False, "error": "API credentials invalid (401)"}
        return {"valid": False, "error": f"HTTP {resp.status_code}"}
    except Exception as e:
        return {"valid": False, "error": str(e)}


async def probe_nextcloud_talk(account: dict) -> NextcloudTalkProbeResult:
    base_url = account.get("base_url", "")
    api_user = account.get("api_user")
    api_password = account.get("api_password", "")
    bot_secret = account.get("bot_secret", "")

    result = NextcloudTalkProbeResult(base_url=base_url)

    if not base_url:
        result.error = "base_url not configured"
        result.warnings.append("base_url is required")
        return result

    conn_result = await probe_nextcloud_talk_connectivity(base_url)
    result.reachable = conn_result["reachable"]
    result.latency_ms = conn_result.get("latency_ms")
    result.nextcloud_version = conn_result.get("nextcloud_version")
    result.talk_app_installed = conn_result.get("talk_app_installed", False)
    result.bots_v1_available = conn_result.get("bots_v1_available", False)
    result.reactions_available = conn_result.get("reactions_available", False)

    if not result.reachable:
        result.error = conn_result.get("error", "unreachable")
        result.warnings.append(f"Nextcloud instance unreachable: {result.error}")
        return result

    if not result.talk_app_installed:
        result.warnings.append("Nextcloud Talk app not detected on this instance")

    if not result.bots_v1_available:
        result.warnings.append("bots-v1 capability not available - Nextcloud Talk may be too old for Bot API")

    if api_user and api_password:
        cred_result = await probe_nextcloud_talk_api_credentials(base_url, api_user, api_password)
        result.api_credentials_valid = cred_result["valid"]
        if not cred_result["valid"]:
            result.warnings.append(f"API credentials: {cred_result.get('error', 'unknown error')}")

    if not bot_secret:
        result.warnings.append("bot_secret not configured - webhook signature verification will fail")

    result.feature_response_checkable = bool(bot_secret)
    if not result.feature_response_checkable:
        result.warnings.append(
            "Cannot verify --feature response: bot_secret not configured. "
            "Ensure 'occ talk:bot:install --feature response' was used."
        )

    result.ok = result.reachable and not any(w for w in result.warnings if "unreachable" in w.lower())

    return result