from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session, joinedload
from app.database import get_db
from app.models import (
    MealPlan, MealPlanItem, MealPlanVote, Recipe,
    FamilyProfile, FamilyMember, ApprovalToken,
    MealPlanStatus, MealPlanItemStatus, MealType, ApprovalTokenStatus
)
from app.schemas import (
    MealPlanResponse, MealPlanCreate,
    MealPlanItemResponse, VoteRequest, VoteResponse
)
from uuid import UUID
from typing import List, Optional
from datetime import datetime, timedelta

router = APIRouter()


@router.get("/planned", response_model=Optional[MealPlanResponse])
def get_planned_meals(db: Session = Depends(get_db)):
    profile = db.query(FamilyProfile).first()
    if not profile:
        raise HTTPException(status_code=404, detail="Family profile not found")

    meal_plan = db.query(MealPlan).filter(
        MealPlan.family_profile_id == profile.id
    ).order_by(MealPlan.week_start_date.desc()).first()

    if not meal_plan:
        return None

    return meal_plan


@router.post("/", response_model=MealPlanResponse)
def create_meal_plan(meal_plan_data: MealPlanCreate, db: Session = Depends(get_db)):
    profile = db.query(FamilyProfile).first()
    if not profile:
        raise HTTPException(status_code=404, detail="Family profile not found")

    existing = db.query(MealPlan).filter(
        MealPlan.family_profile_id == profile.id,
        MealPlan.week_start_date == meal_plan_data.week_start_date
    ).first()
    if existing:
        raise HTTPException(status_code=400, detail="Meal plan for this week already exists")

    db_meal_plan = MealPlan(
        family_profile_id=profile.id,
        week_start_date=meal_plan_data.week_start_date,
        status=MealPlanStatus[meal_plan_data.status.value.upper()],
        approval_deadline=meal_plan_data.approval_deadline,
        notes=meal_plan_data.notes
    )

    db.add(db_meal_plan)
    db.flush()

    for item_data in meal_plan_data.items:
        db_item = MealPlanItem(
            meal_plan_id=db_meal_plan.id,
            recipe_id=item_data.recipe_id,
            day_of_week=item_data.day_of_week,
            meal_type=MealType[item_data.meal_type.value.upper()],
            estimated_cost=item_data.estimated_cost
        )
        db.add(db_item)

    db.commit()
    db.refresh(db_meal_plan)
    return db_meal_plan


@router.get("/{meal_plan_id}", response_model=MealPlanResponse)
def get_meal_plan(meal_plan_id: UUID, db: Session = Depends(get_db)):
    meal_plan = db.query(MealPlan).filter(MealPlan.id == meal_plan_id).first()
    if not meal_plan:
        raise HTTPException(status_code=404, detail="Meal plan not found")
    return meal_plan


@router.post("/{meal_plan_id}/lock")
def lock_meal_plan(meal_plan_id: UUID, db: Session = Depends(get_db)):
    meal_plan = db.query(MealPlan).filter(MealPlan.id == meal_plan_id).first()
    if not meal_plan:
        raise HTTPException(status_code=404, detail="Meal plan not found")

    meal_plan.status = MealPlanStatus.LOCKED
    db.commit()
    return {"message": "Meal plan locked", "status": meal_plan.status.value}


@router.get("/items/{item_id}/vote/{token}")
def get_vote_page(item_id: UUID, token: str, db: Session = Depends(get_db)):
    approval_token = db.query(ApprovalToken).filter(ApprovalToken.token == token).first()
    if not approval_token:
        raise HTTPException(status_code=404, detail="Invalid token")

    if approval_token.meal_plan_item_id != item_id:
        raise HTTPException(status_code=400, detail="Token not valid for this meal")

    if approval_token.status != ApprovalTokenStatus.ACTIVE:
        raise HTTPException(status_code=400, detail="Token has already been used or expired")

    if approval_token.expires_at < datetime.now():
        raise HTTPException(status_code=400, detail="Token has expired")

    item = db.query(MealPlanItem).filter(MealPlanItem.id == item_id).first()
    if not item:
        raise HTTPException(status_code=404, detail="Meal plan item not found")

    return {
        "item_id": str(item_id),
        "family_member_id": str(approval_token.family_member_id),
        "meal_plan_item": item
    }


@router.post("/items/{item_id}/vote/{token}", response_model=VoteResponse)
def submit_vote(item_id: UUID, token: str, vote_data: VoteRequest, db: Session = Depends(get_db)):
    approval_token = db.query(ApprovalToken).filter(ApprovalToken.token == token).first()
    if not approval_token:
        raise HTTPException(status_code=404, detail="Invalid token")

    if approval_token.meal_plan_item_id != item_id:
        raise HTTPException(status_code=400, detail="Token not valid for this meal")

    if approval_token.status != ApprovalTokenStatus.ACTIVE:
        raise HTTPException(status_code=400, detail="Token has already been used or expired")

    if approval_token.expires_at < datetime.now():
        approval_token.status = ApprovalTokenStatus.EXPIRED
        db.commit()
        raise HTTPException(status_code=400, detail="Token has expired")

    existing_vote = db.query(MealPlanVote).filter(
        MealPlanVote.meal_plan_item_id == item_id,
        MealPlanVote.family_member_id == approval_token.family_member_id
    ).first()

    if existing_vote:
        raise HTTPException(status_code=400, detail="You have already voted on this meal")

    vote = MealPlanVote(
        meal_plan_item_id=item_id,
        family_member_id=approval_token.family_member_id,
        vote=vote_data.vote
    )
    db.add(vote)

    approval_token.status = ApprovalTokenStatus.USED
    approval_token.used_at = datetime.now()

    item = db.query(MealPlanItem).filter(MealPlanItem.id == item_id).first()
    if not vote_data.vote and vote_data.denial_reason:
        item.approval_status = MealPlanItemStatus.DENIED
        item.denial_reason = vote_data.denial_reason
        item.denial_details = vote_data.denial_details

    db.commit()
    db.refresh(vote)
    return vote


@router.get("/items/{item_id}", response_model=MealPlanItemResponse)
def get_meal_item(item_id: UUID, db: Session = Depends(get_db)):
    item = db.query(MealPlanItem).options(joinedload(MealPlanItem.recipe)).filter(
        MealPlanItem.id == item_id
    ).first()
    if not item:
        raise HTTPException(status_code=404, detail="Meal plan item not found")
    return item


@router.post("/items/{item_id}/swap")
def swap_meal_item(item_id: UUID, new_recipe_id: UUID, db: Session = Depends(get_db)):
    item = db.query(MealPlanItem).filter(MealPlanItem.id == item_id).first()
    if not item:
        raise HTTPException(status_code=404, detail="Meal plan item not found")

    new_recipe = db.query(Recipe).filter(Recipe.id == new_recipe_id).first()
    if not new_recipe:
        raise HTTPException(status_code=404, detail="New recipe not found")

    item.recipe_id = new_recipe_id
    item.approval_status = MealPlanItemStatus.PENDING
    item.denial_reason = None
    item.denial_details = None

    db.commit()
    return {"message": "Meal swapped", "item": item}