from datetime import UTC, datetime

from fastapi import APIRouter, Depends, HTTPException
from fastapi.responses import Response
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.db.models.invoice import Invoice
from app.db.models.order import Order
from app.db.models.order_line import OrderLine
from app.db.models.tenant import Tenant
from app.db.models.vehicle import Vehicle
from app.db.session import get_db
from app.deps import get_tenant_id
from app.invoices import service
from app.pdf.service import generate_factura

router = APIRouter()


@router.post("")
async def create_invoice(
    data: dict,
    tenant_id: str = Depends(get_tenant_id),
    db: AsyncSession = Depends(get_db),
):
    order_id = data.get("order_id")
    if not order_id:
        raise HTTPException(status_code=422, detail="order_id required")
    try:
        invoice = await service.create_invoice(db, tenant_id, order_id)
        return {"id": invoice.id, "nr_factura": invoice.nr_factura}
    except ValueError as e:
        raise HTTPException(status_code=422, detail=str(e))


@router.get("/{invoice_id}/pdf")
async def get_invoice_pdf(
    invoice_id: str,
    tenant_id: str = Depends(get_tenant_id),
    db: AsyncSession = Depends(get_db),
):
    r = await db.execute(
        select(Invoice).where(
            Invoice.id == invoice_id, Invoice.tenant_id == tenant_id
        )
    )
    invoice = r.scalar_one_or_none()
    if not invoice:
        raise HTTPException(status_code=404, detail="Invoice not found")

    r = await db.execute(select(Order).where(Order.id == invoice.order_id))
    order = r.scalar_one()

    r = await db.execute(select(Vehicle).where(Vehicle.id == order.vehicle_id))
    vehicle = r.scalar_one_or_none()

    r = await db.execute(select(Tenant).where(Tenant.id == tenant_id))
    tenant = r.scalar_one()

    r = await db.execute(
        select(OrderLine).where(OrderLine.order_id == order.id)
    )
    lines = r.scalars().all()

    order_data = {
        "id": order.id,
        "nr_auto": vehicle.nr_inmatriculare if vehicle else "",
        "client_nume": vehicle.client_nume if vehicle else "",
        "client_cui": vehicle.client_cui if vehicle else "",
        "client_adresa": vehicle.client_adresa if vehicle else "",
        "total_manopera": order.total_manopera,
        "total_materiale": order.total_materiale,
        "total_general": order.total_general,
    }

    invoice_data = {
        "nr_factura": invoice.nr_factura,
        "data_factura": invoice.data_factura,
        "total": invoice.total,
    }

    tenant_data = {
        "nume": tenant.nume,
        "cui": tenant.cui,
        "reg_com": tenant.reg_com,
        "adresa": tenant.adresa,
        "iban": tenant.iban,
        "banca": tenant.banca,
    }

    lines_data = [
        {
            "tip": l.tip,
            "descriere": l.descriere,
            "ore": l.ore,
            "pret_ora": l.pret_ora,
            "cantitate": l.cantitate,
            "pret_unitar": l.pret_unitar,
            "um": l.um,
            "total": l.total,
        }
        for l in lines
    ]

    pdf_bytes = generate_factura(invoice_data, order_data, lines_data, tenant_data)
    return Response(
        content=pdf_bytes,
        media_type="application/pdf",
        headers={
            "Content-Disposition": f'inline; filename="factura-{invoice.nr_factura}.pdf"'
        },
    )


@router.delete("/{invoice_id}")
async def delete_invoice(
    invoice_id: str,
    tenant_id: str = Depends(get_tenant_id),
    db: AsyncSession = Depends(get_db),
):
    r = await db.execute(
        select(Invoice).where(
            Invoice.id == invoice_id, Invoice.tenant_id == tenant_id
        )
    )
    invoice = r.scalar_one_or_none()
    if not invoice:
        raise HTTPException(status_code=404, detail="Invoice not found")

    order_id = invoice.order_id

    # Delete the invoice
    await db.delete(invoice)

    # Revert the associated order status back to VALIDAT
    if order_id:
        r = await db.execute(
            select(Order).where(
                Order.id == order_id, Order.tenant_id == tenant_id
            )
        )
        order = r.scalar_one_or_none()
        if order:
            order.status = "VALIDAT"
            order.updated_at = datetime.now(UTC).isoformat()

    await db.commit()
    return {"ok": True}