"""Trip Planner Models - Pydantic schemas for Plan and PlanItem."""

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


class PlaceInput(BaseModel):
    """Place data for adding to plan."""
    
    place_id: str = Field(..., description="Unique place identifier")
    name: str = Field(..., description="Place name")
    category: str = Field(default="", description="Place category")
    lat: float = Field(..., description="Latitude")
    lng: float = Field(..., description="Longitude")
    rating: Optional[float] = Field(None, description="Rating 0-5")
    description: Optional[str] = Field(None, description="Place description")


class PlanItem(BaseModel):
    """A place in the plan with order and metadata."""
    
    item_id: str = Field(..., description="Unique item identifier")
    place_id: str = Field(..., description="Reference to place")
    name: str = Field(..., description="Place name")
    category: str = Field(default="", description="Category")
    lat: float = Field(..., description="Latitude")
    lng: float = Field(..., description="Longitude")
    order: int = Field(..., description="Order in plan (1-indexed)")
    added_at: datetime = Field(default_factory=datetime.now)
    notes: Optional[str] = Field(None, description="User notes")
    rating: Optional[float] = None
    distance_from_prev_km: Optional[float] = Field(None, description="Distance from previous item")


class Plan(BaseModel):
    """A trip plan containing multiple places."""
    
    plan_id: str = Field(..., description="Unique plan identifier")
    user_id: str = Field(..., description="Owner user ID")
    name: str = Field(default="My Trip", description="Plan name")
    items: list[PlanItem] = Field(default_factory=list)
    created_at: datetime = Field(default_factory=datetime.now)
    updated_at: datetime = Field(default_factory=datetime.now)
    total_distance_km: Optional[float] = Field(None, description="Total route distance")
    estimated_duration_min: Optional[int] = Field(None, description="Estimated duration")
    is_optimized: bool = Field(default=False, description="Route has been optimized")


# Request/Response Models

class CreatePlanRequest(BaseModel):
    """Request to create a new plan."""
    
    name: str = Field(default="My Trip", description="Plan name")


class CreatePlanResponse(BaseModel):
    """Response after creating a plan."""
    
    plan_id: str
    name: str
    message: str


class AddPlaceRequest(BaseModel):
    """Request to add a place to plan."""
    
    place: PlaceInput
    notes: Optional[str] = None


class ReorderRequest(BaseModel):
    """Request to reorder places in plan."""
    
    new_order: list[str] = Field(..., description="List of item_ids in new order")


class ReplaceRequest(BaseModel):
    """Request to replace a place."""
    
    new_place: PlaceInput


class OptimizeResponse(BaseModel):
    """Response from route optimization."""
    
    plan_id: str
    items: list[PlanItem]
    total_distance_km: float
    estimated_duration_min: int
    distance_saved_km: Optional[float] = None
    message: str


class PlanResponse(BaseModel):
    """Full plan response."""
    
    plan: Plan
    message: str


# =============================================================================
# SMART PLAN MODELS
# =============================================================================

class PlaceDetailResponse(BaseModel):
    """Rich detail for a place in smart plan."""
    
    place_id: str = Field(..., description="Place ID")
    name: str = Field(..., description="Place name")
    category: str = Field(default="", description="Category")
    lat: float = Field(default=0.0, description="Latitude")
    lng: float = Field(default=0.0, description="Longitude")
    recommended_time: str = Field(default="", description="Recommended visit time (HH:MM)")
    suggested_duration_min: int = Field(default=60, description="Suggested duration in minutes")
    tips: list[str] = Field(default_factory=list, description="Tips for this place")
    highlights: str = Field(default="", description="Highlights from research")
    social_mentions: list[str] = Field(default_factory=list, description="Social media mentions")
    order: int = Field(default=0, description="Order in day")


class DayPlanResponse(BaseModel):
    """Single day plan."""
    
    day_index: int = Field(..., description="Day number (1-indexed)")
    date: Optional[str] = Field(None, description="Date (YYYY-MM-DD)")
    places: list[PlaceDetailResponse] = Field(default_factory=list)
    day_summary: str = Field(default="", description="Day summary")
    day_distance_km: float = Field(default=0.0, description="Total distance for the day")


class SmartPlanResponse(BaseModel):
    """Complete optimized plan with enriched details."""
    
    itinerary_id: str = Field(..., description="Reference ID")
    title: str = Field(..., description="Plan title")
    total_days: int = Field(..., description="Number of days")
    days: list[DayPlanResponse] = Field(default_factory=list)
    summary: str = Field(default="", description="Plan summary")
    total_distance_km: float = Field(default=0.0, description="Total route distance")
    estimated_total_duration_min: int = Field(default=0, description="Total estimated duration")
    generated_at: datetime = Field(default_factory=datetime.now)


class GetPlanRequest(BaseModel):
    """Request for smart plan generation."""
    
    include_social_research: bool = Field(default=True, description="Include social media research")
    freshness: str = Field(default="pw", description="Social search freshness: pw=past week, pm=past month")


class GetPlanResponse(BaseModel):
    """Response with smart plan."""
    
    plan: SmartPlanResponse
    research_count: int = Field(default=0, description="Number of social results found")
    generation_time_ms: float = Field(default=0, description="Plan generation time in ms")
    message: str = Field(default="Smart plan generated successfully")