import os

from reportlab.lib.pagesizes import A4
from reportlab.lib import colors
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont

DEFAULT_MARGIN = 28
DEFAULT_HEADER_H = 86
DEFAULT_FOOTER_H = 72


def register_unicode_fonts():
    if "Vera" in pdfmetrics.getRegisteredFontNames():
        return
    fonts_dir = os.path.join(os.path.dirname(__import__("reportlab").__file__), "fonts")
    pdfmetrics.registerFont(TTFont("Vera", os.path.join(fonts_dir, "Vera.ttf")))
    pdfmetrics.registerFont(TTFont("Vera-Bold", os.path.join(fonts_dir, "VeraBd.ttf")))
    pdfmetrics.registerFont(TTFont("Vera-Italic", os.path.join(fonts_dir, "VeraIt.ttf")))


def draw_standard_header_footer(
    pdf,
    *,
    page_num,
    client_name,
    manufacturer,
    model,
    serial,
    upgrade_hours,
    chassis_hours,
    mileage,
    work_order_number,
    generated_date,
    report_title="Izvještaj servisera",
    page_size=A4,
    margin=DEFAULT_MARGIN,
    header_h=DEFAULT_HEADER_H,
    footer_h=DEFAULT_FOOTER_H,
):
    w, h = page_size

    pdf.setStrokeColor(colors.black)
    pdf.setLineWidth(0.7)
    pdf.rect(margin, h - header_h, w - 2 * margin, header_h - 4, stroke=1, fill=0)

    pdf.setFont("Vera-Bold", 11)
    pdf.drawString(margin + 6, h - 22, str(client_name or "-")[:44])
    pdf.drawCentredString(w / 2, h - 22, report_title)
    pdf.setFont("Vera", 9)
    pdf.drawRightString(w - margin - 6, h - 22, f"Stranica {page_num}")

    pdf.setLineWidth(0.5)
    pdf.line(margin, h - 36, w - margin, h - 36)

    labels = [
        "Model:",
        "Serijski broj:",
        "Radni sati nadogradnje:",
        "Radni sati podvozja:",
        "Km:",
        "Broj naloga:",
    ]
    values = [
        (manufacturer, model),
        serial,
        upgrade_hours,
        chassis_hours,
        mileage,
        work_order_number,
    ]
    col_w = (w - 2 * margin) / len(labels)
    pdf.setFont("Vera", 7.2)
    for i, (lbl, val) in enumerate(zip(labels, values)):
        x = margin + i * col_w + 3
        pdf.drawString(x, h - 49, lbl)
        value_text = str(val or "-")
        value_font_size = 9
        if i == 0 and isinstance(val, tuple):
            manufacturer_text = str(val[0] or "-")[:24]
            model_text = str(val[1] or "-")[:24]
            pdf.setFont("Vera-Bold", 8.2)
            pdf.drawString(x, h - 59, manufacturer_text)
            pdf.setFont("Vera", 7.6)
            pdf.drawString(x, h - 68, model_text)
        elif i == len(labels) - 1:
            value_font_size = 7
            max_value_width = col_w - 8
            while (
                pdf.stringWidth(value_text, "Vera-Bold", value_font_size) > max_value_width
                and value_font_size > 5.5
            ):
                value_font_size -= 0.3
            if pdf.stringWidth(value_text, "Vera-Bold", value_font_size) > max_value_width:
                trimmed = value_text
                while (
                    len(trimmed) > 3
                    and pdf.stringWidth(f"{trimmed}...", "Vera-Bold", value_font_size) > max_value_width
                ):
                    trimmed = trimmed[:-1]
                value_text = f"{trimmed}..."
        else:
            value_text = value_text[:24]
        if not (i == 0 and isinstance(val, tuple)):
            pdf.setFont("Vera-Bold", value_font_size)
            pdf.drawString(x, h - 61, value_text)
        pdf.setFont("Vera", 7.2)
        if i > 0:
            pdf.line(margin + i * col_w, h - 36, margin + i * col_w, h - header_h + 4)

    footer_y = footer_h
    pdf.setLineWidth(0.5)
    pdf.rect(margin, footer_y + 42, w - 2 * margin, 18, stroke=1, fill=0)
    sig_labels = [f"Datum: {generated_date}", "Potpis servisera", "Pečat i potpis klijenta *1", "Pregledao"]
    sig_w = (w - 2 * margin) / 4
    pdf.setFont("Vera", 7.2)
    for i, lbl in enumerate(sig_labels):
        x = margin + i * sig_w
        pdf.drawString(x + 4, footer_y + 45, lbl)
        if i > 0:
            pdf.line(x, footer_y + 42, x, footer_y + 60)
    pdf.setFont("Vera", 6.5)
    pdf.drawString(margin, footer_y + 26, "*1- potpisom klijent potvrđuje da je suglasan s podacima u radnom nalogu")
    pdf.drawCentredString(
        w / 2,
        footer_y + 14,
        "Ovlašteni servis LIEBHERR Werk-Ehingen GmbH, LIEBHERR-Werk Nenzing GmbH, Liebherr-MCCTech Rostock GmbH",
    )