from pydantic import BaseModel, Field
from typing import Optional
from datetime import datetime


class QueryRequest(BaseModel):
    query: str = Field(..., min_length=1, max_length=2000)
    collection: Optional[str] = Field(default="all")
    top_k: Optional[int] = Field(default=5, ge=1, le=20)
    use_reranking: Optional[bool] = Field(default=True)
    filters: Optional[dict] = Field(default=None)


class SourceResult(BaseModel):
    text: str
    score: float
    doc_id: str
    parent_id: str
    filename: str
    collection: str
    metadata: Optional[dict] = None


class QueryResponse(BaseModel):
    success: bool
    query: str
    context: str
    sources: list[SourceResult]
    processing_time_ms: float
    cached: bool
    engine: str = "nexus"


class UploadResponse(BaseModel):
    success: bool
    doc_id: str
    filename: str
    file_size_mb: float
    parents_created: int
    children_created: int
    processing_time_ms: float
    collection: str


class HealthResponse(BaseModel):
    status: str
    timestamp: str
    uptime_seconds: float
    qdrant_connection: str
    cache_entries: int
    version: str = "1.0.0"


class StatsResponse(BaseModel):
    storage: dict
    documents: dict
    queries: dict
    top_queries: list[dict]
    rate_limits: dict


class DeleteResponse(BaseModel):
    success: bool
    doc_id: str
    parents_deleted: int
    children_deleted: int


class CollectionsResponse(BaseModel):
    success: bool
    collections: list[str]
    total: int


class ErrorResponse(BaseModel):
    success: bool = False
    error: str
    detail: Optional[str] = None