from __future__ import annotations

from datetime import datetime, timezone
from typing import Any

from pydantic import BaseModel, Field


def utcnow_iso() -> str:
    return datetime.now(timezone.utc).isoformat()


class BackendRecord(BaseModel):
    backend_id: str
    name: str
    base_url: str
    frontend_base_url: str | None = None
    status: str = "active"
    created_at: str = Field(default_factory=utcnow_iso)
    updated_at: str = Field(default_factory=utcnow_iso)


class BackendCredential(BaseModel):
    backend_id: str
    client_id: str
    client_secret_hash: str
    created_at: str = Field(default_factory=utcnow_iso)
    rotated_at: str | None = None


class UserRecord(BaseModel):
    username: str
    email: str | None = None
    default_backend_id: str | None = None
    created_at: str = Field(default_factory=utcnow_iso)
    updated_at: str = Field(default_factory=utcnow_iso)


class PermissionsModel(BaseModel):
    permissions: dict[str, Any] = Field(default_factory=dict)


class ChannelSettings(BaseModel):
    configured: bool = True
    config: dict[str, Any] = Field(default_factory=dict)
    secrets: dict[str, Any] = Field(default_factory=dict)
    updated_at: str = Field(default_factory=utcnow_iso)

    def masked_dict(self) -> dict[str, Any]:
        data = self.model_dump(mode="json")
        secrets = data.pop("secrets", {})
        data["secrets_masked"] = bool(secrets)
        data["secret_keys"] = sorted(
            str(key).strip()
            for key in (secrets.keys() if isinstance(secrets, dict) else [])
            if str(key).strip()
        )
        return data


class OutlookSettings(BaseModel):
    configured: bool = True
    email: str
    username: str
    domain: str | None = None
    service_endpoint: str | None = None
    server: str | None = None
    autodiscover: bool = False
    default_timezone: str = "Asia/Shanghai"
    password: str
    updated_at: str = Field(default_factory=utcnow_iso)

    def masked_dict(self) -> dict[str, Any]:
        data = self.model_dump()
        data.pop("password", None)
        data["password_masked"] = True
        return data


class BackendRoutingPayload(BaseModel):
    name: str | None = None
    backend_id: str | None = None
    base_url: str | None = None
    frontend_base_url: str | None = None


class RegisterBackendRequest(BaseModel):
    name: str
    base_url: str
    backend_id: str | None = None
    frontend_base_url: str | None = None


class UpdateBackendRequest(BaseModel):
    name: str | None = None
    base_url: str | None = None
    frontend_base_url: str | None = None


class RegisterBackendResponse(BaseModel):
    backend_id: str
    client_id: str
    client_secret: str
    created_at: str
    frontend_base_url: str | None = None


class RegisterUserRequest(BaseModel):
    username: str
    password: str
    email: str | None = None
    name: str | None = None
    backend_name: str | None = None
    backend_id: str | None = None
    base_url: str | None = None
    public_base_url: str | None = None
    frontend_base_url: str | None = None
    backend: BackendRoutingPayload | None = None


class RegisterUserBackendResult(BaseModel):
    backend_id: str
    client_id: str
    client_secret: str | None = None
    name: str
    base_url: str
    frontend_base_url: str | None = None
    status: str = "active"
    created_at: str


class RegisterUserResponse(BaseModel):
    user: UserRecord
    backend: RegisterUserBackendResult


class RotateSecretResponse(BaseModel):
    backend_id: str
    client_id: str
    client_secret: str
    rotated_at: str


class OAuthTokenRequest(BaseModel):
    grant_type: str = "client_credentials"
    client_id: str
    client_secret: str
    aud: str
    scopes: list[str] = Field(default_factory=list)


class OAuthTokenResponse(BaseModel):
    access_token: str
    token_type: str = "bearer"
    expires_in: int


class IntrospectRequest(BaseModel):
    token: str


class IntrospectResponse(BaseModel):
    active: bool
    client_id: str | None = None
    backend_id: str | None = None
    aud: str | None = None
    scp: list[str] = Field(default_factory=list)
    exp: int | None = None