from typing import List, Optional

from db.db import get_db
from db.models import InvestorTable, SectorTable
from fastapi import APIRouter, Depends, HTTPException, Query
from schemas.router_schemas import InvestmentStage, InvestorData
from pydantic import BaseModel
from sqlalchemy.orm import Session, selectinload

router = APIRouter(tags=["Investor Routes"])


# Request schemas for creating/updating
class InvestorCreate(BaseModel):
    name: str
    description: Optional[str] = None
    aum: int
    check_size_lower: int
    check_size_upper: int
    geographic_focus: str
    stage_focus: InvestmentStage
    number_of_investments: int = 0


class InvestorUpdate(BaseModel):
    name: Optional[str] = None
    description: Optional[str] = None
    aum: Optional[int] = None
    check_size_lower: Optional[int] = None
    check_size_upper: Optional[int] = None
    geographic_focus: Optional[str] = None
    stage_focus: Optional[InvestmentStage] = None
    number_of_investments: Optional[int] = None


@router.get("/investors", response_model=List[InvestorData])
def read_investors(db: Session = Depends(get_db)):
    """Get all investors with their related data"""
    investors = (
        db.query(InvestorTable)
        .options(
            selectinload(InvestorTable.portfolio_companies),
            selectinload(InvestorTable.team_members),
            selectinload(InvestorTable.sectors),
        )
        .all()
    )

    # Transform InvestorTable objects to InvestorData format
    investor_data_list = []
    for investor in investors:
        investor_data = InvestorData(
            investor=investor,  # This maps to InvestorSchema
            portfolio_companies=investor.portfolio_companies,
            team_members=investor.team_members,
            sectors=investor.sectors,
        )
        investor_data_list.append(investor_data)

    return investor_data_list


@router.get("/investors/filter", response_model=List[InvestorData])
def filter_investors(
    stage: Optional[InvestmentStage] = Query(
        None, description="Filter by investment stage"
    ),
    min_check_size: Optional[int] = Query(None, description="Minimum check size"),
    max_check_size: Optional[int] = Query(None, description="Maximum check size"),
    geography: Optional[str] = Query(
        None, description="Geographic focus (partial match)"
    ),
    sector: Optional[str] = Query(None, description="Sector name (partial match)"),
    min_aum: Optional[int] = Query(None, description="Minimum AUM"),
    max_aum: Optional[int] = Query(None, description="Maximum AUM"),
    db: Session = Depends(get_db),
):
    """Filter investors based on various criteria"""

    # Start with base query
    query = db.query(InvestorTable).options(
        selectinload(InvestorTable.portfolio_companies),
        selectinload(InvestorTable.team_members),
        selectinload(InvestorTable.sectors),
    )

    # Apply filters
    if stage:
        query = query.filter(InvestorTable.stage_focus == stage)

    if min_check_size is not None:
        query = query.filter(InvestorTable.check_size_lower >= min_check_size)

    if max_check_size is not None:
        query = query.filter(InvestorTable.check_size_upper <= max_check_size)

    if geography:
        query = query.filter(InvestorTable.geographic_focus.ilike(f"%{geography}%"))

    if min_aum is not None:
        query = query.filter(InvestorTable.aum >= min_aum)

    if max_aum is not None:
        query = query.filter(InvestorTable.aum <= max_aum)

    # Filter by sector if provided
    if sector:
        query = query.join(InvestorTable.sectors).filter(
            SectorTable.name.ilike(f"%{sector}%")
        )

    investors = query.all()

    # Transform to InvestorData format
    investor_data_list = []
    for investor in investors:
        investor_data = InvestorData(
            investor=investor,
            portfolio_companies=investor.portfolio_companies,
            team_members=investor.team_members,
            sectors=investor.sectors,
        )
        investor_data_list.append(investor_data)

    return investor_data_list


@router.get("/investors/{investor_id}", response_model=InvestorData)
def read_investor(investor_id: int, db: Session = Depends(get_db)):
    """Get a specific investor by ID"""
    investor = (
        db.query(InvestorTable)
        .options(
            selectinload(InvestorTable.portfolio_companies),
            selectinload(InvestorTable.team_members),
            selectinload(InvestorTable.sectors),
        )
        .filter(InvestorTable.id == investor_id)
        .first()
    )

    if not investor:
        raise HTTPException(status_code=404, detail="Investor not found")

    # Transform to InvestorData format
    return InvestorData(
        investor=investor,
        portfolio_companies=investor.portfolio_companies,
        team_members=investor.team_members,
        sectors=investor.sectors,
    )


@router.post("/investors", response_model=InvestorData)
def create_investor(investor: InvestorCreate, db: Session = Depends(get_db)):
    """Create a new investor"""
    db_investor = InvestorTable(**investor.dict())
    db.add(db_investor)
    db.commit()
    db.refresh(db_investor)

    # Reload with relationships
    investor_with_relations = (
        db.query(InvestorTable)
        .options(
            selectinload(InvestorTable.portfolio_companies),
            selectinload(InvestorTable.team_members),
            selectinload(InvestorTable.sectors),
        )
        .filter(InvestorTable.id == db_investor.id)
        .first()
    )

    # Transform to InvestorData format
    return InvestorData(
        investor=investor_with_relations,
        portfolio_companies=investor_with_relations.portfolio_companies,
        team_members=investor_with_relations.team_members,
        sectors=investor_with_relations.sectors,
    )


@router.put("/investors/{investor_id}", response_model=InvestorData)
def update_investor(
    investor_id: int, investor: InvestorUpdate, db: Session = Depends(get_db)
):
    """Update an existing investor"""
    db_investor = (
        db.query(InvestorTable).filter(InvestorTable.id == investor_id).first()
    )
    if not db_investor:
        raise HTTPException(status_code=404, detail="Investor not found")

    update_data = investor.dict(exclude_unset=True)
    for field, value in update_data.items():
        setattr(db_investor, field, value)

    db.commit()
    db.refresh(db_investor)

    # Reload with relationships
    investor_with_relations = (
        db.query(InvestorTable)
        .options(
            selectinload(InvestorTable.portfolio_companies),
            selectinload(InvestorTable.team_members),
            selectinload(InvestorTable.sectors),
        )
        .filter(InvestorTable.id == investor_id)
        .first()
    )

    # Transform to InvestorData format
    return InvestorData(
        investor=investor_with_relations,
        portfolio_companies=investor_with_relations.portfolio_companies,
        team_members=investor_with_relations.team_members,
        sectors=investor_with_relations.sectors,
    )


@router.delete("/investors/{investor_id}")
def delete_investor(investor_id: int, db: Session = Depends(get_db)):
    """Delete an investor"""
    db_investor = (
        db.query(InvestorTable).filter(InvestorTable.id == investor_id).first()
    )
    if not db_investor:
        raise HTTPException(status_code=404, detail="Investor not found")

    db.delete(db_investor)
    db.commit()
    return {"message": "Investor deleted successfully"}