from __future__ import annotations

from datetime import datetime
from typing import Any, Literal

from pydantic import BaseModel, Field


SystemName = Literal["text2mem", "mem0", "letta", "reme", "memu"]


class MemoryItem(BaseModel):
    id: str
    system: str
    workspace_id: str
    content: str
    memory_type: str = "semantic"
    scope: str = "workspace"
    source: str = "user_direct"
    confidence: float = 1.0
    valid_from: datetime | None = None
    valid_to: datetime | None = None
    created_at: datetime
    updated_at: datetime
    metadata: dict[str, Any] = Field(default_factory=dict)


class AuditEvent(BaseModel):
    id: str
    system: str
    workspace_id: str
    operation: str
    target: str | None = None
    status: str = "ok"
    details: dict[str, Any] = Field(default_factory=dict)
    created_at: datetime


class SystemDescriptor(BaseModel):
    id: SystemName
    name: str
    paradigm: str
    description: str
    available: bool
    mode: str
    status: str
    package: str | None = None
    setup_hint: str | None = None


class ChatRequest(BaseModel):
    system: SystemName
    message: str = Field(min_length=1, max_length=10000)


class ChatResponse(BaseModel):
    system: SystemName
    answer: str
    mode: str
    memory_context: list[MemoryItem] = Field(default_factory=list)
    memory_events: list[dict[str, Any]] = Field(default_factory=list)
    audit_events: list[AuditEvent] = Field(default_factory=list)


class ResetRequest(BaseModel):
    system: SystemName | None = None