from pydantic import BaseModel, field_validator
from typing import Optional, List

from utils.acme_backend_url import AcmeBackendUrlError, validate_acme_backend_url


def _validated_acme_backend_url(value: Optional[str]) -> Optional[str]:
    """Shared field validator body for `acme_backend_url`.

    Pydantic turns the raised ValueError into a 422 with this message attached, so
    the operator sees why the value was refused instead of discovering months later
    that HTTP-01 never worked. Returns the normalised value — callers persist THIS,
    not the raw input, so surrounding whitespace never reaches haproxy.cfg.
    """
    try:
        return validate_acme_backend_url(value)
    except AcmeBackendUrlError as exc:
        raise ValueError(str(exc)) from None

class HAProxyClusterCreate(BaseModel):
    name: str
    description: Optional[str] = None
    connection_type: str = "agent"  # Only "agent" supported now
    stats_socket_path: str = "/run/haproxy/admin.sock"
    haproxy_config_path: str = "/etc/haproxy/haproxy.cfg"
    haproxy_bin_path: str = "/usr/sbin/haproxy"  # HAProxy binary path
    keepalived_config_path: str = "/etc/keepalived/keepalived.conf"  # HA/VIP: keepalived.conf path (Issue #27)
    pool_id: Optional[int] = None  # Which pool this cluster belongs to
    # The create form submits both of these. Until they were declared here pydantic
    # dropped them and the INSERT never carried them, so a cluster created with ACME
    # switched on came back switched off with no error shown — the same silent-success
    # failure this work exists to remove.
    acme_enabled: Optional[bool] = None
    acme_backend_url: Optional[str] = None

    _validate_acme_backend_url = field_validator("acme_backend_url")(
        _validated_acme_backend_url
    )

class HAProxyClusterUpdate(BaseModel):
    name: Optional[str] = None
    description: Optional[str] = None
    connection_type: Optional[str] = None
    stats_socket_path: Optional[str] = None
    haproxy_config_path: Optional[str] = None
    haproxy_bin_path: Optional[str] = None
    keepalived_config_path: Optional[str] = None
    pool_id: Optional[int] = None
    is_active: Optional[bool] = None
    acme_enabled: Optional[bool] = None
    acme_backend_url: Optional[str] = None

    _validate_acme_backend_url = field_validator("acme_backend_url")(
        _validated_acme_backend_url
    )

class HAProxyClusterResponse(BaseModel):
    id: int
    name: str
    description: Optional[str] = None
    
    # Installation options
    installation_type: str
    deployment_type: str
    
    # Connection details
    host: str
    port: int
    connection_type: str
    
    # Status info
    is_active: bool
    is_default: bool
    last_connected_at: Optional[str] = None
    connection_status: str
    connection_error: Optional[str] = None
    haproxy_version: Optional[str] = None
    created_at: str

class HAProxyGlobalConfig(BaseModel):
    max_connections: int = 4096
    timeout_connect: int = 10000
    timeout_client: int = 60000
    timeout_server: int = 60000
    log_level: str = "info"
    stats_enabled: bool = True
    stats_uri: str = "/stats"
    stats_port: int = 8404

class ConfigVersion(BaseModel):
    version_name: str
    description: Optional[str] = None
    config_content: Optional[str] = None
    cluster_id: Optional[int] = None