import os
from fpdf import FPDF
import config

from fpdf import FPDF
import os
import config


def format_amount(amount):
    return f"{amount:.2f}".replace(".", ",")


def generate_uplatnica(order_id, payer_name, payer_address, amount):
    pdf = FPDF(orientation='P', unit='mm', format='A4')
    pdf.set_auto_page_break(False)
    pdf.add_page()

    pdf.set_font("helvetica", size=7)

    # === UPLATNICA AREA (top of A4) ===
    pdf.rect(0, 0, 210, 99)

    # Vertical divider
    pdf.line(105, 0, 105, 99)

    # ===== TOP OPTIONS =====
    labels = ["Hitnost", "Prenos", "Uplata", "Isplata"]
    start_x = 110
    step = 22

    for i, label in enumerate(labels):
        x = start_x + i * step
        pdf.set_xy(x, 2)
        pdf.cell(14, 4, label)

        pdf.rect(x + 14, 2, 4, 4)

        if label == "Uplata":
            pdf.line(x + 14, 2, x + 18, 6)
            pdf.line(x + 18, 2, x + 14, 6)

    # ===== LEFT =====
    pdf.set_font("helvetica", "B", 8)
    pdf.set_xy(5, 5)
    pdf.cell(95, 5, "NALOG PLATIOCA", align="C")

    pdf.rect(5, 12, 95, 14)
    pdf.set_font("helvetica", size=9)
    pdf.set_xy(7, 14)
    pdf.cell(90, 4, payer_name[:40])
    pdf.set_xy(7, 18)
    pdf.cell(90, 4, payer_address[:40])

    pdf.set_font("helvetica", size=6)
    pdf.set_xy(5, 26)
    pdf.cell(95, 4, "(Naziv platioca)", align="C")

    pdf.rect(5, 30, 95, 14)
    pdf.set_font("helvetica", size=9)
    pdf.set_xy(7, 32)
    pdf.cell(90, 4, "Usluge 3D stampe")
    pdf.set_xy(7, 36)
    pdf.cell(90, 4, f"Narudzba {order_id}")

    pdf.set_font("helvetica", size=6)
    pdf.set_xy(5, 44)
    pdf.cell(95, 4, "(Svrha placanja)", align="C")

    pdf.rect(5, 48, 95, 14)
    pdf.set_font("helvetica", size=9)
    pdf.set_xy(7, 50)
    pdf.cell(90, 4, config.COMPANY_NAME[:40])

    pdf.set_font("helvetica", size=6)
    pdf.set_xy(5, 62)
    pdf.cell(95, 4, "(Naziv primaoca)", align="C")

    pdf.line(5, 90, 100, 90)
    pdf.set_xy(5, 90)
    pdf.cell(95, 4, "(Potpis platioca)", align="C")

    # ===== RIGHT =====
    pdf.rect(110, 12, 95, 8)

    pdf.set_font("helvetica", size=7)
    pdf.set_xy(110, 22)
    pdf.cell(10, 4, "EUR")

    pdf.rect(120, 22, 50, 10)
    pdf.rect(175, 22, 30, 10)

    pdf.set_font("helvetica", "B", 11)
    pdf.set_xy(120, 24)
    pdf.cell(50, 6, format_amount(amount), align="C")

    pdf.set_xy(175, 24)
    pdf.cell(30, 6, "121", align="C")

    pdf.set_font("helvetica", size=6)
    pdf.set_xy(120, 32)
    pdf.cell(50, 4, "(Iznos)", align="C")

    pdf.set_xy(175, 32)
    pdf.cell(30, 4, "(Sifra)", align="C")

    pdf.rect(110, 36, 95, 10)
    pdf.set_font("helvetica", size=10)
    pdf.set_xy(110, 38)
    pdf.cell(95, 6, config.ZIRO_RACUN, align="C")

    pdf.rect(110, 50, 20, 8)
    pdf.rect(135, 50, 70, 8)

    pdf.set_xy(110, 52)
    pdf.cell(20, 4, "00", align="C")
    pdf.set_xy(135, 52)
    pdf.cell(70, 4, str(order_id), align="C")

    pdf.line(110, 90, 205, 90)
    pdf.set_xy(110, 90)
    pdf.cell(95, 4, "(Potpis primaoca)", align="C")

    # ===== SAVE =====


    pdf_dir = os.path.join(config.UPLOAD_DIR, "invoices")
    os.makedirs(pdf_dir, exist_ok=True)

    filename = f"uplatnica_order_{order_id}.pdf"
    filepath = os.path.join(pdf_dir, filename)
    pdf.output(filepath)

    return os.path.join("uploads", "invoices", filename).replace("\\", "/")