"""Admin router — protected CRUD for settings, integrations, and MQTT subscriptions."""

from __future__ import annotations

import logging
from typing import Any, Dict, List, Optional

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel

from server.auth import require_admin
from server.services import settings_service
from server.services.test_connections import TEST_FUNCTIONS

logger = logging.getLogger(__name__)

router = APIRouter(
    prefix="/api/admin",
    tags=["admin"],
    dependencies=[Depends(require_admin)],
)


# ---------------------------------------------------------------------------
# Request/Response Models
# ---------------------------------------------------------------------------

class SettingsUpdate(BaseModel):
    settings: Dict[str, Any]


class IntegrationUpdate(BaseModel):
    name: Optional[str] = None
    config: Optional[Dict[str, Any]] = None
    enabled: Optional[bool] = None
    display_order: Optional[int] = None


class MqttSubscriptionCreate(BaseModel):
    topic_pattern: str
    display_name: str = ""
    category: str = "other"
    unit: str = ""
    widget_type: str = "value"
    enabled: bool = True
    display_order: int = 0


class MqttSubscriptionUpdate(BaseModel):
    topic_pattern: Optional[str] = None
    display_name: Optional[str] = None
    category: Optional[str] = None
    unit: Optional[str] = None
    widget_type: Optional[str] = None
    enabled: Optional[bool] = None
    display_order: Optional[int] = None


# ---------------------------------------------------------------------------
# Settings
# ---------------------------------------------------------------------------

@router.get("/settings")
async def get_settings() -> Dict[str, Any]:
    """Return all app settings."""
    return await settings_service.get_all_settings()


@router.put("/settings")
async def update_settings(body: SettingsUpdate) -> Dict[str, str]:
    """Bulk update settings."""
    await settings_service.bulk_set_settings(body.settings)
    # Reload in-memory settings
    await _reload_app_settings()
    return {"status": "ok", "message": f"Updated {len(body.settings)} setting(s)"}


# ---------------------------------------------------------------------------
# Integrations
# ---------------------------------------------------------------------------

@router.get("/integrations")
async def list_integrations() -> List[Dict[str, Any]]:
    """List all integration configs."""
    return await settings_service.get_integrations()


@router.get("/integrations/{type_name}")
async def get_integration(type_name: str) -> Dict[str, Any]:
    """Get a single integration config."""
    result = await settings_service.get_integration(type_name)
    if result is None:
        raise HTTPException(status_code=404, detail=f"Integration '{type_name}' not found")
    return result


@router.put("/integrations/{type_name}")
async def update_integration(type_name: str, body: IntegrationUpdate) -> Dict[str, Any]:
    """Update an integration config."""
    existing = await settings_service.get_integration(type_name)
    if existing is None:
        raise HTTPException(status_code=404, detail=f"Integration '{type_name}' not found")

    result = await settings_service.upsert_integration(
        type_name=type_name,
        name=body.name or existing["name"],
        config=body.config if body.config is not None else existing["config"],
        enabled=body.enabled if body.enabled is not None else existing["enabled"],
        display_order=body.display_order if body.display_order is not None else existing["display_order"],
    )

    # Reload in-memory settings
    await _reload_app_settings()
    return result


@router.post("/integrations/{type_name}/test")
async def test_integration(type_name: str) -> Dict[str, Any]:
    """Test an integration connection."""
    integration = await settings_service.get_integration(type_name)
    if integration is None:
        raise HTTPException(status_code=404, detail=f"Integration '{type_name}' not found")

    test_fn = TEST_FUNCTIONS.get(type_name)
    if test_fn is None:
        return {"success": False, "message": f"No test available for '{type_name}'"}

    return await test_fn(integration["config"])


# ---------------------------------------------------------------------------
# MQTT Subscriptions
# ---------------------------------------------------------------------------

@router.get("/mqtt/subscriptions")
async def list_mqtt_subscriptions() -> List[Dict[str, Any]]:
    """List all MQTT subscriptions."""
    return await settings_service.get_mqtt_subscriptions()


@router.post("/mqtt/subscriptions")
async def create_mqtt_subscription(body: MqttSubscriptionCreate) -> Dict[str, Any]:
    """Create a new MQTT subscription."""
    return await settings_service.create_mqtt_subscription(
        topic_pattern=body.topic_pattern,
        display_name=body.display_name,
        category=body.category,
        unit=body.unit,
        widget_type=body.widget_type,
        enabled=body.enabled,
        display_order=body.display_order,
    )


@router.put("/mqtt/subscriptions/{sub_id}")
async def update_mqtt_subscription(sub_id: int, body: MqttSubscriptionUpdate) -> Dict[str, Any]:
    """Update an MQTT subscription."""
    fields = body.model_dump(exclude_none=True)
    if not fields:
        raise HTTPException(status_code=400, detail="No fields to update")
    result = await settings_service.update_mqtt_subscription(sub_id, **fields)
    if result is None:
        raise HTTPException(status_code=404, detail="Subscription not found")
    return result


@router.delete("/mqtt/subscriptions/{sub_id}")
async def delete_mqtt_subscription(sub_id: int) -> Dict[str, str]:
    """Delete an MQTT subscription."""
    deleted = await settings_service.delete_mqtt_subscription(sub_id)
    if not deleted:
        raise HTTPException(status_code=404, detail="Subscription not found")
    return {"status": "ok", "message": "Subscription deleted"}


# ---------------------------------------------------------------------------
# Internal helpers
# ---------------------------------------------------------------------------

async def _reload_app_settings() -> None:
    """Reload the in-memory Settings object from the database."""
    try:
        from server.config import reload_settings
        await reload_settings()
    except Exception:
        logger.exception("Failed to reload settings after admin change")