"""Ultra-minimal Pydantic models for pure Mem0 API."""

from typing import List, Optional, Dict, Any
from pydantic import BaseModel, Field


# Request Models
class ChatMessage(BaseModel):
    """Chat message structure."""
    role: str = Field(..., description="Message role (user, assistant, system)")
    content: str = Field(..., description="Message content")


class ChatRequest(BaseModel):
    """Ultra-minimal chat request."""
    message: str = Field(..., description="User message")
    user_id: str = Field("default", description="User identifier")
    context: Optional[List[ChatMessage]] = Field(None, description="Previous conversation context")
    metadata: Optional[Dict[str, Any]] = Field(None, description="Additional metadata")


class MemoryAddRequest(BaseModel):
    """Request to add memories with hierarchy support - open-source compatible."""
    messages: List[ChatMessage] = Field(..., description="Messages to process")
    user_id: str = Field("default", description="User identifier")
    agent_id: Optional[str] = Field(None, description="Agent identifier")
    run_id: Optional[str] = Field(None, description="Run identifier")
    metadata: Optional[Dict[str, Any]] = Field(None, description="Additional metadata")


class MemorySearchRequest(BaseModel):
    """Request to search memories with hierarchy filtering."""
    query: str = Field(..., description="Search query")
    user_id: str = Field("default", description="User identifier")
    limit: int = Field(5, description="Maximum number of results")
    threshold: Optional[float] = Field(None, description="Minimum relevance score")
    filters: Optional[Dict[str, Any]] = Field(None, description="Additional filters")
    
    # Hierarchy filters (open-source compatible)
    agent_id: Optional[str] = Field(None, description="Filter by agent identifier")
    run_id: Optional[str] = Field(None, description="Filter by run identifier")


class MemoryUpdateRequest(BaseModel):
    """Request to update a memory."""
    memory_id: str = Field(..., description="Memory ID to update")
    content: str = Field(..., description="New memory content")
    metadata: Optional[Dict[str, Any]] = Field(None, description="Updated metadata")


# Response Models - Ultra-minimal


class MemoryItem(BaseModel):
    """Individual memory item."""
    id: str = Field(..., description="Memory unique identifier")
    memory: str = Field(..., description="Memory content")
    user_id: Optional[str] = Field(None, description="Associated user ID")
    metadata: Optional[Dict[str, Any]] = Field(None, description="Memory metadata")
    score: Optional[float] = Field(None, description="Relevance score (for search results)")
    created_at: Optional[str] = Field(None, description="Creation timestamp")
    updated_at: Optional[str] = Field(None, description="Last update timestamp")


class MemorySearchResponse(BaseModel):
    """Memory search results - pure Mem0 structure."""
    memories: List[MemoryItem] = Field(..., description="Found memories")
    total_count: int = Field(..., description="Total number of memories found")
    query: str = Field(..., description="Original search query")


class MemoryAddResponse(BaseModel):
    """Response from adding memories - pure Mem0 structure."""
    added_memories: List[Dict[str, Any]] = Field(..., description="Memories that were added")
    message: str = Field(..., description="Success message")


class GraphRelationship(BaseModel):
    """Graph relationship structure."""
    source: str = Field(..., description="Source entity")
    relationship: str = Field(..., description="Relationship type")
    target: str = Field(..., description="Target entity")
    properties: Optional[Dict[str, Any]] = Field(None, description="Relationship properties")


class GraphResponse(BaseModel):
    """Graph relationships - pure Mem0 structure."""
    relationships: List[GraphRelationship] = Field(..., description="Found relationships")
    entities: List[str] = Field(..., description="Unique entities")
    user_id: str = Field(..., description="User identifier")


class HealthResponse(BaseModel):
    """Health check response."""
    status: str = Field(..., description="Service status")
    services: Dict[str, str] = Field(..., description="Individual service statuses")
    timestamp: str = Field(..., description="Health check timestamp")


class ErrorResponse(BaseModel):
    """Error response structure."""
    error: str = Field(..., description="Error message")
    detail: Optional[str] = Field(None, description="Detailed error information")
    status_code: int = Field(..., description="HTTP status code")


# Statistics and Monitoring Models

class MemoryOperationStats(BaseModel):
    """Memory operation statistics."""
    add: int = Field(..., description="Number of add operations")
    search: int = Field(..., description="Number of search operations")
    update: int = Field(..., description="Number of update operations")
    delete: int = Field(..., description="Number of delete operations")


class GlobalStatsResponse(BaseModel):
    """Global application statistics."""
    total_memories: int = Field(..., description="Total memories across all users")
    total_users: int = Field(..., description="Total number of users")
    api_calls_today: int = Field(..., description="Total API calls today")
    avg_response_time_ms: float = Field(..., description="Average response time in milliseconds")
    memory_operations: MemoryOperationStats = Field(..., description="Memory operation breakdown")
    uptime_seconds: float = Field(..., description="Application uptime in seconds")


class UserStatsResponse(BaseModel):
    """User-specific statistics."""
    user_id: str = Field(..., description="User identifier")
    memory_count: int = Field(..., description="Number of memories for this user")
    relationship_count: int = Field(..., description="Number of graph relationships for this user")
    last_activity: Optional[str] = Field(None, description="Last activity timestamp")
    api_calls_today: int = Field(..., description="API calls made by this user today")
    avg_response_time_ms: float = Field(..., description="Average response time for this user's requests")