from app.services.db_service import db
from app.models.subcontractor_rate_model import SubcontractorRate
from sqlalchemy import func


class SubcontractorRateService:

    @staticmethod
    def save_or_update(form):

        rate_id = form.get("id")

        subcontractor_id = form.get("subcontractor_id")
        category = form.get("category")
        item_name = form.get("item_name").strip()

        # -----------------------------
        # Duplicate Validation
        # -----------------------------
        duplicate = (
            SubcontractorRate.query
            .filter(
                SubcontractorRate.subcontractor_id == subcontractor_id,
                SubcontractorRate.category == category,
                func.lower(SubcontractorRate.item_name) == item_name.lower()
            )
            .first()
        )

        # Ignore current record while editing
        if duplicate and (not rate_id or duplicate.id != int(rate_id)):
            return {
                "success": False,
                "message": "Category and Rate already exists for this Subcontractor."
            }

        # -----------------------------
        # Insert / Update
        # -----------------------------
        if rate_id:
            rate = SubcontractorRate.query.get_or_404(rate_id)
        else:
            rate = SubcontractorRate()

        rate.subcontractor_id = subcontractor_id
        rate.category = category
        rate.item_code = form.get("item_code")
        rate.item_name = item_name
        rate.unit = form.get("unit")
        rate.rate = form.get("rate")
        rate.effective_from = form.get("effective_from")
        rate.effective_to = form.get("effective_to") or None
        rate.status = form.get("status")

        if not rate_id:
            db.session.add(rate)

        db.session.commit()

        return {
            "success": True,
            "message": "Saved Successfully."
        }
    
    @staticmethod
    def get_all_rates():

        return (
            SubcontractorRate.query
            .order_by(SubcontractorRate.created_at.desc())
            .all()
        )
        
        
    @staticmethod
    def get_rate(rate_id):

        return SubcontractorRate.query.get_or_404(rate_id)
    
    def delete_rate(rate_id):
        rate = SubcontractorRate.query.get_or_404(rate_id)
        db.session.delete(rate)
        db.session.commit()
        

    @staticmethod
    def check_duplicate(subcontractor_id, category, item_name, rate_id=None):

        query = SubcontractorRate.query.filter(
            SubcontractorRate.subcontractor_id == subcontractor_id,
            SubcontractorRate.category == category,
            func.lower(SubcontractorRate.item_name) == item_name.strip().lower()
        )

        if rate_id:
            query = query.filter(SubcontractorRate.id != int(rate_id))

        return query.first() is not None