"""Service provider management API routes."""

import logging

from fastapi import APIRouter, Depends, HTTPException, status
from pydantic import BaseModel, ValidationError
from sqlmodel import select
from sqlmodel.ext.asyncio.session import AsyncSession
from typing import Any

import aiohttp

from ..auth.dependencies import get_current_user
from ..database.engine import get_session
from ..database.models import ServiceProvider, User
from ..services import make_immich_provider, make_gitea_provider, make_planka_provider, make_nut_provider

_LOGGER = logging.getLogger(__name__)

router = APIRouter(prefix="/api/providers", tags=["providers"])


class ProviderCreate(BaseModel):
    type: str
    name: str
    icon: str = ""
    config: dict[str, Any] = {}


class ProviderUpdate(BaseModel):
    name: str | None = None
    icon: str | None = None
    config: dict[str, Any] | None = None


class ProviderResponse(BaseModel):
    id: int
    type: str
    name: str
    icon: str
    config: dict[str, Any]
    created_at: str


# -- Per-provider config validation models --


class ImmichProviderConfig(BaseModel):
    url: str
    api_key: str
    external_domain: str | None = None


class GiteaProviderConfig(BaseModel):
    url: str
    webhook_secret: str
    api_token: str | None = None


class PlankaProviderConfig(BaseModel):
    url: str
    webhook_secret: str
    api_key: str | None = None


class SchedulerProviderConfig(BaseModel):
    """Scheduler is a virtual provider — no required fields."""

    pass


class NutProviderConfig(BaseModel):
    host: str
    port: int = 3493
    username: str | None = None
    password: str | None = None


_PROVIDER_CONFIG_MODELS: dict[str, type[BaseModel]] = {
    "immich": ImmichProviderConfig,
    "gitea": GiteaProviderConfig,
    "planka": PlankaProviderConfig,
    "scheduler": SchedulerProviderConfig,
    "nut": NutProviderConfig,
}


def _validate_provider_config(provider_type: str, config: dict[str, Any]) -> None:
    """Validate provider config against the schema for the given type."""
    config_model = _PROVIDER_CONFIG_MODELS.get(provider_type)
    if config_model is None:
        return
    try:
        config_model.model_validate(config)
    except ValidationError as exc:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=f"Invalid config for '{provider_type}' provider: {exc}",
        )


@router.get("")
async def list_providers(
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """List all service providers for the current user."""
    result = await session.exec(
        select(ServiceProvider).where(ServiceProvider.user_id == user.id)
    )
    providers = result.all()
    return [_provider_response(p) for p in providers]


@router.post("", status_code=status.HTTP_201_CREATED)
async def create_provider(
    body: ProviderCreate,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Add a new service provider (validates connection for known types)."""
    _validate_provider_config(body.type, body.config)

    # Validate connection for known provider types
    if body.type == "immich":
        from notify_bridge_core.providers.immich import ImmichServiceProvider
        config = body.config
        async with aiohttp.ClientSession() as http_session:
            immich = ImmichServiceProvider(
                http_session, config.get("url", ""), config.get("api_key", ""),
                config.get("external_domain"), body.name,
            )
            test_result = await immich.test_connection()
            if not test_result.get("ok"):
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail=test_result.get("message", f"Cannot connect to {body.type} provider"),
                )
            # Store external_domain from server config if available
            if test_result.get("external_domain"):
                config["external_domain"] = test_result["external_domain"]

    elif body.type == "gitea":
        config = body.config
        # api_token is optional (webhook_secret is required, but token only for repo listing)
        if config.get("api_token"):
            async with aiohttp.ClientSession() as http_session:
                from notify_bridge_core.providers.gitea import GiteaServiceProvider
                gitea = GiteaServiceProvider(
                    http_session, config.get("url", ""), config.get("api_token", ""), body.name,
                )
                test_result = await gitea.test_connection()
                if not test_result.get("ok"):
                    raise HTTPException(
                        status_code=status.HTTP_400_BAD_REQUEST,
                        detail=test_result.get("message", "Cannot connect to Gitea"),
                    )

    elif body.type == "planka":
        config = body.config
        if config.get("api_key"):
            async with aiohttp.ClientSession() as http_session:
                from notify_bridge_core.providers.planka import PlankaServiceProvider
                planka = PlankaServiceProvider(
                    http_session, config.get("url", ""), config.get("api_key", ""), body.name,
                )
                test_result = await planka.test_connection()
                if not test_result.get("ok"):
                    raise HTTPException(
                        status_code=status.HTTP_400_BAD_REQUEST,
                        detail=test_result.get("message", "Cannot connect to Planka"),
                    )

    elif body.type == "nut":
        nut = make_nut_provider(ServiceProvider(
            id=0, user_id=0, type="nut", name=body.name, config=body.config,
        ))
        test_result = await nut.test_connection()
        if not test_result.get("ok"):
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=test_result.get("message", "Cannot connect to NUT server"),
            )

    # Scheduler: no validation needed (virtual provider)

    provider = ServiceProvider(
        user_id=user.id,
        type=body.type,
        name=body.name,
        icon=body.icon,
        config=body.config,
    )
    session.add(provider)
    await session.commit()
    await session.refresh(provider)
    return _provider_response(provider)


@router.get("/capabilities")
async def list_provider_capabilities():
    """List capabilities for all registered provider types."""
    from notify_bridge_core.providers.capabilities import get_all_capabilities
    result = {}
    for pt, caps in get_all_capabilities().items():
        result[pt] = {
            "provider_type": caps.provider_type,
            "display_name": caps.display_name,
            "notification_slots": caps.notification_slots,
            "command_slots": caps.command_slots,
            "events": caps.events,
            "commands": caps.commands,
            "supported_filters": caps.supported_filters,
            "webhook_based": caps.webhook_based,
            "action_types": caps.action_types,
        }
    return result


@router.get("/capabilities/{provider_type}")
async def get_provider_capabilities(provider_type: str):
    """Get capabilities for a provider type (events, slots, commands)."""
    from notify_bridge_core.providers.capabilities import get_capabilities
    caps = get_capabilities(provider_type)
    if not caps:
        raise HTTPException(status_code=404, detail=f"Unknown provider type: {provider_type}")
    return {
        "provider_type": caps.provider_type,
        "display_name": caps.display_name,
        "notification_slots": caps.notification_slots,
        "command_slots": caps.command_slots,
        "events": caps.events,
        "commands": caps.commands,
        "supported_filters": caps.supported_filters,
        "webhook_based": caps.webhook_based,
    }


@router.get("/{provider_id}")
async def get_provider(
    provider_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Get a specific service provider."""
    provider = await _get_user_provider(session, provider_id, user.id)
    return _provider_response(provider)


@router.put("/{provider_id}")
async def update_provider(
    provider_id: int,
    body: ProviderUpdate,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Update a service provider."""
    provider = await _get_user_provider(session, provider_id, user.id)
    if body.name is not None:
        provider.name = body.name
    if body.icon is not None:
        provider.icon = body.icon

    config_changed = body.config is not None and body.config != provider.config
    if body.config is not None:
        _validate_provider_config(provider.type, body.config)
        provider.config = body.config

    # Re-validate connection when config changes for known provider types
    if config_changed and provider.type == "immich":
        try:
            async with aiohttp.ClientSession() as http_session:
                immich = make_immich_provider(http_session, provider)
                test_result = await immich.test_connection()
                if not test_result.get("ok"):
                    raise HTTPException(
                        status_code=status.HTTP_400_BAD_REQUEST,
                        detail=test_result.get("message", f"Cannot connect to {provider.type} provider"),
                    )
                if test_result.get("external_domain"):
                    provider.config = {**provider.config, "external_domain": test_result["external_domain"]}
        except aiohttp.ClientError as err:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=f"Connection error: {err}",
            )
    elif config_changed and provider.type == "gitea":
        if provider.config.get("api_token"):
            try:
                async with aiohttp.ClientSession() as http_session:
                    gitea = make_gitea_provider(http_session, provider)
                    test_result = await gitea.test_connection()
                    if not test_result.get("ok"):
                        raise HTTPException(
                            status_code=status.HTTP_400_BAD_REQUEST,
                            detail=test_result.get("message", "Cannot connect to Gitea"),
                        )
            except aiohttp.ClientError as err:
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail=f"Connection error: {err}",
                )
    elif config_changed and provider.type == "planka":
        if provider.config.get("api_key"):
            try:
                async with aiohttp.ClientSession() as http_session:
                    planka = make_planka_provider(http_session, provider)
                    test_result = await planka.test_connection()
                    if not test_result.get("ok"):
                        raise HTTPException(
                            status_code=status.HTTP_400_BAD_REQUEST,
                            detail=test_result.get("message", "Cannot connect to Planka"),
                        )
            except aiohttp.ClientError as err:
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail=f"Connection error: {err}",
                )
    elif config_changed and provider.type == "nut":
        nut = make_nut_provider(provider)
        test_result = await nut.test_connection()
        if not test_result.get("ok"):
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=test_result.get("message", "Cannot connect to NUT server"),
            )

    session.add(provider)
    await session.commit()
    await session.refresh(provider)
    return _provider_response(provider)


@router.delete("/{provider_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_provider(
    provider_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Delete a service provider."""
    from .delete_protection import check_service_provider, raise_if_used
    provider = await _get_user_provider(session, provider_id, user.id)
    raise_if_used(await check_service_provider(session, provider.id), provider.name)
    await session.delete(provider)
    await session.commit()


@router.post("/{provider_id}/test")
async def test_provider(
    provider_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Check if a service provider is reachable."""
    provider = await _get_user_provider(session, provider_id, user.id)

    if provider.type == "immich":
        async with aiohttp.ClientSession() as http_session:
            immich = make_immich_provider(http_session, provider)
            return await immich.test_connection()

    if provider.type == "gitea":
        if not provider.config.get("api_token"):
            return {"ok": True, "message": "Gitea webhook-only mode (no API token for testing)"}
        async with aiohttp.ClientSession() as http_session:
            gitea = make_gitea_provider(http_session, provider)
            return await gitea.test_connection()

    if provider.type == "planka":
        if not provider.config.get("api_key"):
            return {"ok": True, "message": "Planka webhook-only mode (no API key for testing)"}
        async with aiohttp.ClientSession() as http_session:
            planka = make_planka_provider(http_session, provider)
            return await planka.test_connection()

    if provider.type == "scheduler":
        return {"ok": True, "message": "Virtual provider — always available"}

    if provider.type == "nut":
        nut = make_nut_provider(provider)
        return await nut.test_connection()

    return {"ok": False, "message": f"Unknown provider type: {provider.type}"}


@router.get("/{provider_id}/people")
async def list_people(
    provider_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Fetch people from a service provider (Immich only)."""
    provider = await _get_user_provider(session, provider_id, user.id)

    if provider.type == "immich":
        from notify_bridge_core.providers.immich.client import ImmichClient
        async with aiohttp.ClientSession() as http_session:
            client = ImmichClient(
                http_session,
                provider.config.get("url", ""),
                provider.config.get("api_key", ""),
            )
            try:
                async with http_session.get(
                    f"{client.url}/api/people",
                    headers={"x-api-key": client.api_key},
                    ssl=False,
                ) as response:
                    if response.status == 200:
                        data = await response.json()
                        people_list = data.get("people", data) if isinstance(data, dict) else data
                        return [
                            {"id": p["id"], "name": p.get("name", "")}
                            for p in people_list
                            if p.get("name")
                        ]
            except Exception as e:
                _LOGGER.error("Failed to fetch people: %s", e)

    return []


@router.get("/{provider_id}/collections")
async def list_collections(
    provider_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Fetch collections from a service provider."""
    provider = await _get_user_provider(session, provider_id, user.id)

    if provider.type == "immich":
        async with aiohttp.ClientSession() as http_session:
            immich = make_immich_provider(http_session, provider)
            return await immich.list_collections()

    if provider.type == "gitea":
        if not provider.config.get("api_token"):
            return []
        async with aiohttp.ClientSession() as http_session:
            gitea = make_gitea_provider(http_session, provider)
            return await gitea.list_collections()

    if provider.type == "planka":
        if not provider.config.get("api_key"):
            return []
        async with aiohttp.ClientSession() as http_session:
            planka = make_planka_provider(http_session, provider)
            return await planka.list_collections()

    if provider.type == "nut":
        nut = make_nut_provider(provider)
        return await nut.list_collections()

    return []


@router.get("/{provider_id}/albums/{album_id}/shared-links")
async def get_album_shared_links(
    provider_id: int,
    album_id: str,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Check shared links for a specific album."""
    provider = await _get_user_provider(session, provider_id, user.id)

    if provider.type == "immich":
        async with aiohttp.ClientSession() as http_session:
            immich = make_immich_provider(http_session, provider)
            links = await immich.client.get_shared_links(album_id)
            return [
                {
                    "id": link.id,
                    "key": link.key,
                    "has_password": link.has_password,
                    "is_expired": link.is_expired,
                    "is_accessible": link.is_accessible,
                }
                for link in links
            ]

    return []


@router.post("/{provider_id}/albums/{album_id}/shared-links")
async def create_album_shared_link(
    provider_id: int,
    album_id: str,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Auto-create a public shared link for an album."""
    provider = await _get_user_provider(session, provider_id, user.id)

    if provider.type == "immich":
        async with aiohttp.ClientSession() as http_session:
            immich = make_immich_provider(http_session, provider)
            success = await immich.client.create_shared_link(album_id)
            if success:
                return {"success": True}
            from fastapi import HTTPException
            raise HTTPException(status_code=400, detail="Failed to create shared link")

    from fastapi import HTTPException
    raise HTTPException(status_code=400, detail="Provider type does not support shared links")


def _provider_response(p: ServiceProvider) -> dict:
    """Build a safe response dict for a provider."""
    config = dict(p.config)
    # Mask sensitive fields
    for secret_field in ("api_key", "api_token", "webhook_secret", "password"):
        if secret_field in config:
            key = config[secret_field]
            config[secret_field] = f"{key[:8]}...{key[-4:]}" if len(key) > 12 else "***"
    return {
        "id": p.id,
        "type": p.type,
        "name": p.name,
        "icon": p.icon,
        "config": config,
        "created_at": p.created_at.isoformat(),
    }


async def _get_user_provider(
    session: AsyncSession, provider_id: int, user_id: int
) -> ServiceProvider:
    """Get a provider owned by the user, or raise 404."""
    provider = await session.get(ServiceProvider, provider_id)
    if not provider or provider.user_id != user_id:
        raise HTTPException(status_code=404, detail="Provider not found")
    return provider