"""
Servers API routes.

Provides CRUD endpoints for Gitea server management:
- POST /api/servers - Create a new server
- GET /api/servers - List all servers
- GET /api/servers/{id} - Get a specific server
- PUT /api/servers/{id} - Update a server
- DELETE /api/servers/{id} - Delete a server
"""
from typing import List
from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session

from app.api.deps import get_db_session, require_auth
from app.schemas.server import ServerCreate, ServerUpdate, ServerResponse
from app.schemas.common import SuccessResponse
from app.services.server_service import ServerService


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


@router.post("", response_model=SuccessResponse[ServerResponse], status_code=status.HTTP_201_CREATED)
def create_server(
    server_data: ServerCreate,
    db: Session = Depends(get_db_session),
    _auth: None = Depends(require_auth)
):
    """
    Create a new Gitea server.

    The API token will be encrypted before storage.
    The name must be unique across all servers.
    A local storage path will be automatically generated based on the server name.

    Args:
        server_data: Server creation data
        db: Database session (injected)
        _auth: Authentication requirement (injected)

    Returns:
        SuccessResponse containing the created server

    Raises:
        HTTPException 400: If validation fails or name already exists
        HTTPException 401: If authentication fails
    """
    service = ServerService(db)

    try:
        server = service.create_server(
            name=server_data.name,
            url=server_data.url,
            api_token=server_data.api_token,
            ssh_key_id=server_data.ssh_key_id,
            sync_enabled=server_data.sync_enabled,
            schedule_cron=server_data.schedule_cron
        )

        return SuccessResponse(
            code=0,
            data=ServerResponse(
                id=server.id,
                name=server.name,
                url=server.url,
                ssh_key_id=server.ssh_key_id,
                sync_enabled=server.sync_enabled,
                schedule_cron=server.schedule_cron,
                local_path=server.local_path,
                status=server.status,
                created_at=server.created_at,
                updated_at=server.updated_at
            ),
            message="Server created successfully"
        )

    except ValueError as e:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=str(e)
        )


@router.get("", response_model=SuccessResponse[List[ServerResponse]])
def list_servers(
    db: Session = Depends(get_db_session),
    _auth: None = Depends(require_auth)
):
    """
    List all servers.

    Returns all servers ordered by creation time.
    API tokens are not included in the response.

    Args:
        db: Database session (injected)
        _auth: Authentication requirement (injected)

    Returns:
        SuccessResponse containing list of servers

    Raises:
        HTTPException 401: If authentication fails
    """
    service = ServerService(db)
    servers = service.list_servers()

    return SuccessResponse(
        code=0,
        data=[
            ServerResponse(
                id=server.id,
                name=server.name,
                url=server.url,
                ssh_key_id=server.ssh_key_id,
                sync_enabled=server.sync_enabled,
                schedule_cron=server.schedule_cron,
                local_path=server.local_path,
                status=server.status,
                created_at=server.created_at,
                updated_at=server.updated_at
            )
            for server in servers
        ],
        message=f"Retrieved {len(servers)} server(s)"
    )


@router.get("/{server_id}", response_model=SuccessResponse[ServerResponse])
def get_server(
    server_id: int,
    db: Session = Depends(get_db_session),
    _auth: None = Depends(require_auth)
):
    """
    Get a specific server by ID.

    Args:
        server_id: ID of the server
        db: Database session (injected)
        _auth: Authentication requirement (injected)

    Returns:
        SuccessResponse containing the server

    Raises:
        HTTPException 401: If authentication fails
        HTTPException 404: If server not found
    """
    service = ServerService(db)
    server = service.get_server(server_id)

    if server is None:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Server with ID {server_id} not found"
        )

    return SuccessResponse(
        code=0,
        data=ServerResponse(
            id=server.id,
            name=server.name,
            url=server.url,
            ssh_key_id=server.ssh_key_id,
            sync_enabled=server.sync_enabled,
            schedule_cron=server.schedule_cron,
            local_path=server.local_path,
            status=server.status,
            created_at=server.created_at,
            updated_at=server.updated_at
        ),
        message="Server retrieved successfully"
    )


@router.put("/{server_id}", response_model=SuccessResponse[ServerResponse])
def update_server(
    server_id: int,
    server_data: ServerUpdate,
    db: Session = Depends(get_db_session),
    _auth: None = Depends(require_auth)
):
    """
    Update a server.

    Only the fields provided in the request body will be updated.
    If api_token is provided, it will be encrypted before storage.
    If name is changed, the local_path will be updated accordingly.

    Args:
        server_id: ID of the server to update
        server_data: Server update data (all fields optional)
        db: Database session (injected)
        _auth: Authentication requirement (injected)

    Returns:
        SuccessResponse containing the updated server

    Raises:
        HTTPException 400: If validation fails
        HTTPException 401: If authentication fails
        HTTPException 404: If server not found
    """
    service = ServerService(db)

    # Build update dict from non-None fields
    update_data = {}
    if server_data.name is not None:
        update_data['name'] = server_data.name
    if server_data.url is not None:
        update_data['url'] = server_data.url
    if server_data.api_token is not None:
        update_data['api_token'] = server_data.api_token
    if server_data.ssh_key_id is not None:
        update_data['ssh_key_id'] = server_data.ssh_key_id
    if server_data.sync_enabled is not None:
        update_data['sync_enabled'] = server_data.sync_enabled
    if server_data.schedule_cron is not None:
        update_data['schedule_cron'] = server_data.schedule_cron
    if server_data.status is not None:
        update_data['status'] = server_data.status

    if not update_data:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="No fields provided for update"
        )

    try:
        server = service.update_server(server_id, **update_data)

        return SuccessResponse(
            code=0,
            data=ServerResponse(
                id=server.id,
                name=server.name,
                url=server.url,
                ssh_key_id=server.ssh_key_id,
                sync_enabled=server.sync_enabled,
                schedule_cron=server.schedule_cron,
                local_path=server.local_path,
                status=server.status,
                created_at=server.created_at,
                updated_at=server.updated_at
            ),
            message="Server updated successfully"
        )

    except ValueError as e:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=str(e)
        )


@router.delete("/{server_id}", response_model=SuccessResponse[dict])
def delete_server(
    server_id: int,
    db: Session = Depends(get_db_session),
    _auth: None = Depends(require_auth)
):
    """
    Delete a server.

    Args:
        server_id: ID of the server to delete
        db: Database session (injected)
        _auth: Authentication requirement (injected)

    Returns:
        SuccessResponse with empty data

    Raises:
        HTTPException 401: If authentication fails
        HTTPException 404: If server not found
    """
    service = ServerService(db)
    deleted = service.delete_server(server_id)

    if not deleted:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"Server with ID {server_id} not found"
        )

    return SuccessResponse(
        code=0,
        data={},
        message="Server deleted successfully"
    )