from datetime import datetime, timedelta
from typing import Optional

from db.db import get_db
from db.models import InvestorInsightCache, InvestorTable, ProjectTable
from fastapi import APIRouter, Depends, HTTPException
from schemas.insight_schema import InsightResponse
from services.compatibility_score import (
    calculate_project_investor_compatibility,
    generate_compatibility_explanation,
)
from services.insight import QueryProcessor
from sqlalchemy.orm import Session

router = APIRouter()


@router.get(
    "/insights/{investor_id}", response_model=InsightResponse, tags=["Insights"]
)
async def get_insights(
    investor_id: int, project_id: Optional[int] = None, db: Session = Depends(get_db)
):
    """
    Get investor insights including investment pattern analysis, market position,
    and optionally compatibility score with a project.

    Args:
        investor_id: The ID of the investor to analyze
        project_id: Optional project ID to calculate compatibility score

    Returns:
        InsightResponse with investment_pattern_analysis, market_position,
        and compatibility_score (if project_id provided)
    """
    # Get investor from database
    investor = db.query(InvestorTable).filter(InvestorTable.id == investor_id).first()
    if not investor:
        raise HTTPException(
            status_code=404, detail=f"Investor with id {investor_id} not found"
        )

    # Check if we have cached insights
    cached_insights = (
        db.query(InvestorInsightCache)
        .filter(InvestorInsightCache.investor_id == investor_id)
        .first()
    )

    # Determine if cache needs refresh (older than 1 month)
    needs_refresh = True
    if cached_insights:
        # Calculate if cache is older than 1 month
        cache_age = (
            datetime.now(cached_insights.last_refreshed.tzinfo)
            - cached_insights.last_refreshed
        )
        needs_refresh = cache_age > timedelta(days=30)

    # Fetch new insights if needed
    if needs_refresh:
        # Initialize the query processor for insights
        query_processor = QueryProcessor()

        # Get investment pattern analysis and market position using web search
        insights = await query_processor.get_investor_insights(
            investor_name=investor.name,
            investor_website=investor.website,
            investor_description=investor.description,
            investor_headquarters=investor.headquarters,
            investment_thesis=investor.investment_thesis,
            portfolio_highlights=investor.portfolio_highlights,
        )

        # Update or create cache entry
        if cached_insights:
            # Update existing cache
            cached_insights.investment_pattern_analysis = insights[
                "investment_pattern_analysis"
            ]
            cached_insights.market_position = insights["market_position"]
            cached_insights.last_refreshed = datetime.now(
                cached_insights.last_refreshed.tzinfo
            )
        else:
            # Create new cache entry
            cached_insights = InvestorInsightCache(
                investor_id=investor_id,
                investment_pattern_analysis=insights["investment_pattern_analysis"],
                market_position=insights["market_position"],
            )
            db.add(cached_insights)

        db.commit()
        db.refresh(cached_insights)

    # Calculate compatibility score if project_id is provided
    compatibility_score = None
    if project_id:
        project = db.query(ProjectTable).filter(ProjectTable.id == project_id).first()
        if not project:
            raise HTTPException(
                status_code=404, detail=f"Project with id {project_id} not found"
            )

        # Calculate the compatibility score
        score = calculate_project_investor_compatibility(
            project, investor, use_funds=True
        )

        # Generate detailed explanation
        compatibility_score = generate_compatibility_explanation(
            project, investor, score, use_funds=True
        )
    else:
        compatibility_score = "Select a project to see compatibility analysis"

    return InsightResponse(
        investment_pattern_analysis=cached_insights.investment_pattern_analysis,
        market_position=cached_insights.market_position,
        compatibility_score=compatibility_score,
    )