"""SigNoz integration helpers.

Provides configuration and connectivity validation for SigNoz via the
Query Range API (``SIGNOZ_URL`` + ``SIGNOZ_API_KEY``).
"""

from __future__ import annotations

import logging
import os
from dataclasses import dataclass
from typing import Any

import httpx
from pydantic import Field

from config.strict_config import StrictConfigModel
from integrations._validation_helpers import report_validation_failure

logger = logging.getLogger(__name__)

DEFAULT_SIGNOZ_TIMEOUT_SECONDS = 10.0
DEFAULT_SIGNOZ_MAX_RESULTS = 50


class SigNozConfig(StrictConfigModel):
    """Normalized SigNoz Query API connection settings."""

    url: str = ""
    api_key: str = ""
    timeout_seconds: float = Field(default=DEFAULT_SIGNOZ_TIMEOUT_SECONDS, gt=0)
    max_results: int = Field(default=DEFAULT_SIGNOZ_MAX_RESULTS, gt=0, le=200)
    integration_id: str = ""

    @property
    def is_configured(self) -> bool:
        return bool(self.url and self.api_key)


@dataclass(frozen=True)
class SigNozValidationResult:
    """Result of validating a SigNoz integration."""

    ok: bool
    detail: str


def build_signoz_config(raw: dict[str, Any] | None) -> SigNozConfig:
    """Build a normalized SigNoz config object from env/store data."""
    return SigNozConfig.model_validate(raw or {})


def signoz_config_from_env() -> SigNozConfig | None:
    """Load a SigNoz config from env vars."""
    url = os.getenv("SIGNOZ_URL", "").strip()
    api_key = os.getenv("SIGNOZ_API_KEY", "").strip()

    if not (url and api_key):
        return None

    return build_signoz_config(
        {
            "url": url,
            "api_key": api_key,
        }
    )


def validate_signoz_config(config: SigNozConfig) -> SigNozValidationResult:
    """Validate SigNoz Query API connectivity."""
    if not config.is_configured:
        return SigNozValidationResult(
            ok=False,
            detail=(
                "SigNoz configuration is incomplete. "
                "Provide SIGNOZ_URL and SIGNOZ_API_KEY (service account key)."
            ),
        )

    base_url = config.url.rstrip("/")

    try:
        response = httpx.get(
            f"{base_url}/api/v2/metrics",
            headers={
                "SigNoz-Api-Key": config.api_key,
                "Accept": "application/json",
            },
            params={"limit": 1, "offset": 0},
            timeout=config.timeout_seconds,
        )
        response.raise_for_status()
        return SigNozValidationResult(
            ok=True,
            detail=(
                "Connected to SigNoz Query API "
                "(/api/v2/metrics, /api/v5/query_range for logs/metrics/traces)."
            ),
        )
    except httpx.HTTPStatusError as err:
        snippet = err.response.text[:200].strip()
        detail = (
            f"HTTP {err.response.status_code}: {snippet}"
            if snippet
            else f"HTTP {err.response.status_code}"
        )
        return SigNozValidationResult(
            ok=False,
            detail=f"SigNoz Query API validation failed: {detail}",
        )
    except Exception as err:
        report_validation_failure(
            err,
            logger=logger,
            integration="signoz",
            method="validate_signoz_config",
        )
        return SigNozValidationResult(
            ok=False,
            detail=f"SigNoz Query API validation failed: {err}",
        )


def signoz_is_available(sources: dict[str, dict]) -> bool:
    """Check if SigNoz integration params are present in available sources."""
    return bool(sources.get("signoz", {}).get("connection_verified"))


def signoz_extract_params(sources: dict[str, dict]) -> dict[str, Any]:
    """Extract SigNoz connection params from resolved integrations.

    Credentials are resolved from the integration store or environment, so the
    LLM never needs to supply URL or API key directly.
    """
    sz = sources.get("signoz", {})
    return {
        "url": str(sz.get("url", "")).strip(),
        "api_key": str(sz.get("api_key", "")).strip(),
    }


def classify(credentials: dict[str, Any], record_id: str) -> tuple[SigNozConfig | None, str | None]:
    try:
        cfg = build_signoz_config(
            {
                "url": credentials.get("url", ""),
                "api_key": credentials.get("api_key", ""),
                "integration_id": record_id,
            }
        )
    except Exception:
        return None, None
    if cfg.is_configured:
        return cfg, "signoz"
    return None, None